Gamma-ray Burst 100906A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:49:42 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.709d {+01h 54m 50s} (J2000),
                  28.888d {+01h 55m 33s} (current),
                  27.877d {+01h 51m 30s} (1950)
GRB_DEC:         +55.614d {+55d 36' 50"} (J2000),
                 +55.666d {+55d 39' 57"} (current),
                 +55.369d {+55d 22' 07"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2623 [cnts]    Image_Peak=191 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   41     E_range: 25-100 keV
BKG_INTEN:       26773 [cnts]
BKG_TIME:        49753.84 SOD {13:49:13.84} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06
GRB_TIME:        49767.41 SOD {13:49:27.41} UT
GRB_PHI:         -150.44 [deg]
GRB_THETA:        40.75 [deg]
SOLN_STATUS:     0x2003
RATE_SIGNIF:     22.69 [sigma]
IMAGE_SIGNIF:    10.50 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +0  +0  +1 +31  +0 
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.77d {+09h 15m 04s}  +12.66d {+12d 39' 39"}
MOON_DIST:        90.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.86, -6.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.36, 40.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 202.98,8.11 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/FERMI NOTICE 
NOTICE_DATE:     Mon 06 Sep 10 13:49:45 UT 
NOTICE_TYPE:     Fermi-GBM Flight Position 
RECORD_NUM:      44 
TRIGGER_NUM:     305473769 
GRB_RA:          129.667d {+08h 38m 40s} (J2000), 
                 129.865d {+08h 39m 28s} (current), 
                 128.736d {+08h 34m 57s} (1950) 
GRB_DEC:         +53.250d {+53d 15' 00"} (J2000), 
                 +53.212d {+53d 12' 43"} (current), 
                 +53.426d {+53d 25' 33"} (1950) 
GRB_ERROR:       4.23 [deg radius, statistical plus systematic] 
GRB_INTEN:       1052 [cnts/sec] 
DATA_SIGNIF:     13.30 [sigma] 
INTEG_TIME:      0.512 [sec] 
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06 
GRB_TIME:        49767.63 SOD {13:49:27.63} UT
GRB_PHI:         190.00 [deg] 
GRB_THETA:       150.00 [deg] 
DATA_TIME_SCALE: 0.5120 [sec] 
HARD_RATIO:      0.71 
LOC_ALGORITHM:   3 (version number of) 
MOST_LIKELY:      97%  GRB 
2nd_MOST_LIKELY:   2%  Generic Transient 
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0, 
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"} 
SUN_DIST:         54.94 [deg]   Sun_angle= 2.4 [hr] (West of Sun) 
MOON_POSTN:      138.77d {+09h 15m 04s}  +12.66d {+12d 39' 38"} 
MOON_DIST:        41.17 [deg] 
MOON_ILLUM:      5 [%] 
GAL_COORDS:      165.08, 37.27 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      117.26, 33.50 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.   
COMMENTS:        This trigger occurred at longitude,latitude = 150.60,20.82 [deg].

GCN NOTICE

 
TITLE:           GCN/FERMI NOTICE 
NOTICE_DATE:     Mon 06 Sep 10 13:49:52 UT 
NOTICE_TYPE:     Fermi-GBM Flight Position 
RECORD_NUM:      57 
TRIGGER_NUM:     305473769 
GRB_RA:           30.317d {+02h 01m 16s} (J2000), 
                  30.492d {+02h 01m 58s} (current), 
                  29.500d {+01h 58m 00s} (1950) 
GRB_DEC:         +51.900d {+51d 53' 60"} (J2000), 
                 +51.951d {+51d 57' 05"} (current), 
                 +51.659d {+51d 39' 31"} (1950) 
GRB_ERROR:       5.63 [deg radius, statistical plus systematic] 
GRB_INTEN:       526 [cnts/sec] 
DATA_SIGNIF:     34.20 [sigma] 
INTEG_TIME:      4.096 [sec] 
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06 
GRB_TIME:        49767.63 SOD {13:49:27.63} UT 
GRB_PHI:         183.00 [deg] 
GRB_THETA:        95.00 [deg] 
DATA_TIME_SCALE: 4.0960 [sec] 
HARD_RATIO:      0.88 
LOC_ALGORITHM:   3 (version number of) 
MOST_LIKELY:      96%  GRB 
2nd_MOST_LIKELY:   2%  GRO_J0422_32 
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0, 
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"} 
SUN_DIST:        110.08 [deg]   Sun_angle= 9.0 [hr] (West of Sun) 
MOON_POSTN:      138.77d {+09h 15m 04s}  +12.66d {+12d 39' 36"} 
MOON_DIST:        90.92 [deg] 
MOON_ILLUM:      5 [%] 
GAL_COORDS:      133.75, -9.50 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:       48.35, 36.73 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.   
COMMENTS:        This trigger occurred at longitude,latitude = 150.60,20.82 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:50:11 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     305473769
GRB_RA:           25.960d {+01h 43m 50s} (J2000),
                  26.136d {+01h 44m 33s} (current),
                  25.140d {+01h 40m 34s} (1950)
GRB_DEC:         +56.300d {+56d 17' 60"} (J2000),
                 +56.353d {+56d 21' 12"} (current),
                 +56.049d {+56d 02' 56"} (1950)
GRB_ERROR:       2.62 [deg radius, statistical only]
DATA_SIGNIF:     48.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06
GRB_TIME:        49767.63 SOD {13:49:27.63} UT
GRB_PHI:         188.00 [deg]
GRB_THETA:        96.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"}
SUN_DIST:        108.88 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:      138.77d {+09h 15m 05s}  +12.66d {+12d 39' 32"}
MOON_DIST:        91.47 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      130.19, -5.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.99, 41.81 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:50:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     305473769
GRB_RA:           27.390d {+01h 49m 34s} (J2000),
                  27.569d {+01h 50m 17s} (current),
                  26.557d {+01h 46m 14s} (1950)
GRB_DEC:         +56.910d {+56d 54' 36"} (J2000),
                 +56.963d {+56d 57' 46"} (current),
                 +56.662d {+56d 39' 43"} (1950)
GRB_ERROR:       1.82 [deg radius, statistical only]
DATA_SIGNIF:     38.10 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06
GRB_TIME:        49767.63 SOD {13:49:27.63} UT
GRB_PHI:         188.00 [deg]
GRB_THETA:        97.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"}
SUN_DIST:        107.89 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      138.77d {+09h 15m 05s}  +12.66d {+12d 39' 33"}
MOON_DIST:        90.50 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      130.84, -5.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.31, 41.97 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:50:17 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      69
TRIGGER_NUM:     305473769
GRB_RA:           27.920d {+01h 51m 41s} (J2000),
                  28.099d {+01h 52m 24s} (current),
                  27.085d {+01h 48m 20s} (1950)
GRB_DEC:         +56.660d {+56d 39' 36"} (J2000),
                 +56.712d {+56d 42' 45"} (current),
                 +56.413d {+56d 24' 47"} (1950)
GRB_ERROR:       1.61 [deg radius, statistical only]
DATA_SIGNIF:     62.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06
GRB_TIME:        49767.63 SOD {13:49:27.63} UT
GRB_PHI:         187.00 [deg]
GRB_THETA:        97.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 47"}
SUN_DIST:        107.86 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.77d {+09h 15m 05s}  +12.66d {+12d 39' 31"}
MOON_DIST:        90.34 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.18, -5.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.49, 41.61 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 06 Sep 10 13:50:28 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6059,   Sub_Num: 0
GRB_INTEN:      10.03 [sigma]
GRB_TIME:       49766.76 SOD {13:49:26.76} UT
GRB_DATE:       15445 TJD;   249 DOY;   10/09/06
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=433509).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2010-09/2010-09-06T13-49-26.5436-13907-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:51:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.6825d {+01h 54m 43.80s} (J2000),
                  28.8612d {+01h 55m 26.69s} (current),
                  27.8501d {+01h 51m 24.02s} (1950)
GRB_DEC:         +55.6286d {+55d 37' 42.9"} (J2000),
                 +55.6807d {+55d 40' 50.5"} (current),
                 +55.3834d {+55d 23' 00.2"} (1950)
GRB_ERROR:       5.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.34e-08 [erg/cm2/sec]
GRB_SIGNIF:      6.00 [sigma]
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49847.64 SOD {13:50:47.64} UT,   80.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.23 261.38 243.69
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 46"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.78d {+09h 15m 08s}  +12.65d {+12d 39' 16"}
MOON_DIST:        90.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       49.35, 40.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.27 arcmin from the BAT position.  
COMMENTS:        There is a bright star (mag=6.45) 8.02 arcmin from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:51:31 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.6825d {+01h 54m 43.8s} (J2000),
                  28.8612d {+01h 55m 26.6s} (current),
                  27.8501d {+01h 51m 24.0s} (1950)
GRB_DEC:         +55.6286d {+55d 37' 42.9"} (J2000),
                 +55.6807d {+55d 40' 50.5"} (current),
                 +55.3834d {+55d 23' 00.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49847.64 SOD {13:50:47.64} UT,   80.2 [sec] since BAT Trigger Time
CENTROID_X:      279.55,  raw= 280  [pixels]
CENTROID_Y:      315.44,  raw= 315  [pixels]
ROLL:            46.17 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   41.11
GRB_POS_XRT_Z:   -53.62
IMAGE_URL:       sw00433509000msxps_rw.img
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 45"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.78d {+09h 15m 08s}  +12.65d {+12d 39' 14"}
MOON_DIST:        90.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       49.35, 40.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:51:37 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.6825d {+01h 54m 43.8s} (J2000),
                  28.8612d {+01h 55m 26.6s} (current),
                  27.8501d {+01h 51m 24.0s} (1950)
GRB_DEC:         +55.6286d {+55d 37' 42.9"} (J2000),
                 +55.6807d {+55d 40' 50.5"} (current),
                 +55.3834d {+55d 23' 00.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49847.64 SOD {13:50:47.64} UT,   80.2 [sec] since BAT Trigger Time
CENTROID_X:      279.55,  raw= 280  [pixels]
CENTROID_Y:      315.44,  raw= 315  [pixels]
ROLL:            46.17 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   41.11
GRB_POS_XRT_Z:   -53.62
IMAGE_URL:       sw00433509000msxps_rw.img
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 45"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.78d {+09h 15m 08s}  +12.65d {+12d 39' 13"}
MOON_DIST:        90.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       49.35, 40.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:52:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.709d {+01h 54m 50s} (J2000),
                  28.888d {+01h 55m 33s} (current),
                  27.877d {+01h 51m 30s} (1950)
GRB_DEC:         +55.614d {+55d 36' 50"} (J2000),
                 +55.666d {+55d 39' 57"} (current),
                 +55.369d {+55d 22' 07"} (1950)
GRB_DATE:        15445 TJD;   249 DOY;   10/09/06
GRB_TIME:        49767.41 SOD {13:49:27.41} UT
TRIGGER_INDEX:   41
GRB_PHI:         -150.44 [deg]
GRB_THETA:        40.75 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x2003
RATE_SIGNIF:     22.69 [sigma]
IMAGE_SIGNIF:    10.50 [sigma]
LC_URL:          sw00433509000msb.lc
SUN_POSTN:       165.13d {+11h 00m 32s}   +6.35d {+06d 20' 44"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.80d {+09h 15m 11s}  +12.65d {+12d 38' 55"}
MOON_DIST:        90.38 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.86, -6.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.36, 40.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 202.98,8.11 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:59:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49913.84 SOD {13:51:53.84} UT,   146.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.375
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00433509000msufc0146.fits
SUN_POSTN:       165.14d {+11h 00m 33s}   +6.34d {+06d 20' 38"}
SUN_DIST:        108.30 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.86d {+09h 15m 27s}  +12.62d {+12d 37' 26"}
MOON_DIST:        90.45 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:59:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49913.84 SOD {13:51:53.84} UT,   146.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.375
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00433509000msufc0146.fits
SUN_POSTN:       165.14d {+11h 00m 33s}   +6.34d {+06d 20' 38"}
SUN_DIST:        108.30 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.86d {+09h 15m 27s}  +12.62d {+12d 37' 26"}
MOON_DIST:        90.45 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 13:59:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49913.84 SOD {13:51:53.84} UT,   146.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.375
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00433509000msufc0146.fits
SUN_POSTN:       165.14d {+11h 00m 33s}   +6.34d {+06d 20' 38"}
SUN_DIST:        108.30 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.87d {+09h 15m 28s}  +12.62d {+12d 37' 19"}
MOON_DIST:        90.45 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:00:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
ROLL:            46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49913.84 SOD {13:51:53.84} UT,   146.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     305473919
X_OFFSET:        851 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00433509000msuni0153.fits
SUN_POSTN:       165.14d {+11h 00m 33s}   +6.34d {+06d 20' 37"}
SUN_DIST:        108.30 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.87d {+09h 15m 30s}  +12.62d {+12d 37' 10"}
MOON_DIST:        90.46 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:00:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
ROLL:            46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49913.84 SOD {13:51:53.84} UT,   146.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     305473919
X_OFFSET:        851 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00433509000msuni0153.fits
SUN_POSTN:       165.14d {+11h 00m 34s}   +6.34d {+06d 20' 37"}
SUN_DIST:        108.30 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.88d {+09h 15m 31s}  +12.62d {+12d 37' 06"}
MOON_DIST:        90.46 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:04:45 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.6838d {+01h 54m 44.11s} (J2000),
                  28.8625d {+01h 55m 27.00s} (current),
                  27.8514d {+01h 51m 24.33s} (1950)
GRB_DEC:         +55.6304d {+55d 37' 49.4"} (J2000),
                 +55.6825d {+55d 40' 57.0"} (current),
                 +55.3852d {+55d 23' 06.6"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         14.89 +/- 0.14 [mag]
FILTER:          7, U
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  49917.00 SOD {13:51:57.00} UT,   149.6 [sec] since BAT Trigger Time
SUN_POSTN:       165.14d {+11h 00m 34s}   +6.34d {+06d 20' 33"}
SUN_DIST:        108.28 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      138.92d {+09h 15m 40s}  +12.60d {+12d 36' 14"}
MOON_DIST:        90.48 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.36, 40.51 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 6.8 arcsec from the XRT position.  
COMMENTS:        There is a bright star (mag=6.45) 8.09 arcmin from the UVOT position.

GCN Circular #11227
C. B. Markwardt (NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), O. Godet (U Leicester), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), W.B Landsman (GSFC), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), D. C. Morris (GWU/GSFC), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 13:49:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100906A (trigger=433509). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 28.709, +55.614, which is
```
   RA(J2000)  =  01h 54m 50s
   Dec(J2000) = +55d 36' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple bright peaks with a duration of about 130 sec. The peak count rate was ~11000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 13:50:47.6 UT, 80.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 28.68305, 55.62985 which is equivalent to:
```
   RA(J2000)  = 01h 54m 43.93s
   Dec(J2000) = +55d 37' 47.5"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 78 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.21 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 2.6 (+2.21/-1.90) x 10^21 cm^-2 (90% confidence).
The initial flux in the 0.1 s image was 2.34e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 146 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	01:54:44.11 =  28.68380
  DEC(J2000) = +55:37:49.6  =  55.63045
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.90 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.36.
A bright XRT flare at ~120 s corresponds to the last peak in the prompt emission. The UVOT bright source is probably also associated in time with the flare. More information to follow.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #11228
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka
Two MASTER robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Baykal Lake (Tunka) and Blagoveschensk was pointed to the Swift GRB 100906A (Markwardt et al., GCN CIRCULAR 11227) 23 sec after Notice time (38 s after trigger time) and 43 s after Notice time (58s after trigger time).
We have a number polarization, unfiltered images with exposition 10, 20, 30, 40, 60... s.
We see bright OT at Swift Uvot position (Markwardt et al., GCN CIRCULAR 11227).
The message may be cited.
mailto: lipunov@sai.msu.ru

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:17:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     433509,   Seg_Num: 0
GRB_RA:           28.6829d {+01h 54m 43.89s} (J2000),
                  28.8616d {+01h 55m 26.79s} (current),
                  27.8505d {+01h 51m 24.12s} (1950)
GRB_DEC:         +55.6300d {+55d 37' 48.0"} (J2000),
                 +55.6821d {+55d 40' 55.6"} (current),
                 +55.3848d {+55d 23' 05.2"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50073.00 SOD {13:54:33.00} UT,   305.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       165.15d {+11h 00m 36s}   +6.34d {+06d 20' 21"}
SUN_DIST:        108.29 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.04d {+09h 16m 10s}  +12.56d {+12d 33' 21"}
MOON_DIST:        90.59 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       49.36, 40.51 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=6.45) 8.05 arcmin from the XRT position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:21:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50621.10 SOD {14:03:41.10} UT,   853.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.782
N_STARS:         190
X_OFFSET:        291 [pixels]
Y_OFFSET:        191 [pixels]
X_MAX:           1730 [pixels]
Y_MAX:           1630 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00433509000msufc0853.fits
SUN_POSTN:       165.15d {+11h 00m 37s}   +6.34d {+06d 20' 17"}
SUN_DIST:        108.31 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.09d {+09h 16m 20s}  +12.54d {+12d 32' 21"}
MOON_DIST:        90.64 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:21:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50621.10 SOD {14:03:41.10} UT,   853.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.782
N_STARS:         190
X_OFFSET:        291 [pixels]
Y_OFFSET:        191 [pixels]
X_MAX:           1730 [pixels]
Y_MAX:           1630 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00433509000msufc0853.fits
SUN_POSTN:       165.15d {+11h 00m 37s}   +6.34d {+06d 20' 17"}
SUN_DIST:        108.31 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.09d {+09h 16m 20s}  +12.54d {+12d 32' 21"}
MOON_DIST:        90.64 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:22:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
POINT_ROLL:      46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50621.10 SOD {14:03:41.10} UT,   853.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.782
N_STARS:         190
X_OFFSET:        291 [pixels]
Y_OFFSET:        191 [pixels]
X_MAX:           1730 [pixels]
Y_MAX:           1630 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00433509000msufc0853.fits
SUN_POSTN:       165.15d {+11h 00m 37s}   +6.34d {+06d 20' 17"}
SUN_DIST:        108.31 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.09d {+09h 16m 21s}  +12.54d {+12d 32' 17"}
MOON_DIST:        90.64 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:23:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
ROLL:            46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50621.10 SOD {14:03:41.10} UT,   853.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     305474627
X_OFFSET:        850 [pixels]
Y_OFFSET:        750 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1010
Y_GRB_POS:       910
BINNING_INDEX:   1
IM_URL:          sw00433509000msuni0860.fits
SUN_POSTN:       165.15d {+11h 00m 37s}   +6.34d {+06d 20' 16"}
SUN_DIST:        108.31 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.10d {+09h 16m 24s}  +12.53d {+12d 32' 03"}
MOON_DIST:        90.65 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 06 Sep 10 14:23:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     433509,   Seg_Num: 0
POINT_RA:         28.677d {+01h 54m 43s} (J2000)
POINT_DEC:       +55.610d {+55d 36' 37"} (J2000)
ROLL:            46.167d
IMG_START_DATE:  15445 TJD;   249 DOY;   10/09/06
IMG_START_TIME:  50621.10 SOD {14:03:41.10} UT,   853.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     305474627
X_OFFSET:        850 [pixels]
Y_OFFSET:        750 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1010
Y_GRB_POS:       910
BINNING_INDEX:   1
IM_URL:          sw00433509000msuni0860.fits
SUN_POSTN:       165.15d {+11h 00m 37s}   +6.34d {+06d 20' 16"}
SUN_DIST:        108.31 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      139.10d {+09h 16m 24s}  +12.53d {+12d 31' 59"}
MOON_DIST:        90.65 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      131.84, -6.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       49.34, 40.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.45) 8.77 arcmin from the BAT position.

GCN Circular #11229
A. Melandri (INAF-OAB), D. Kopac (U. Ljubljana) and Z. Cano (LJMU) report on behalf of a large collaboration:
The Faulkes Telescope North automatically began observing Swift GRB 100906A (trigger = 433509, Markwardt et al., GCN 11227) on September 06,13:53:03 UT, about 3.5 minutes from the GRB trigger time. We clearly identify an uncatalogued object at the following position:
```
RA(J2000.0):  01:54:44.09
Dec(J2000.0): +55:37:49.5
```
The position is consistent with UVOT candidate and the object is clearly fading. Preliminary photometry gives a magnitude of R=15.5 +/- 0.1 @800 s after the burst event.
Observations are going on.
GCN Circular #11230
N. R. Tanvir, K. Wiersema (U. Leicester) and A. J. Levan (U. Warwick) report on behalf of a larger collaboration:
We observed the location of GRB 100906A (Markwardt et al. GCN 11227; Ivanov et al. GCN 11228; Melandri et al. GCN 11229) with the Gemini-North Telescope on Mauna Kea using the GMOS spectrograph. Observations began at 14:30 UT, approximately 40 minutes post burst.
We detect strong continuum from the afterglow, and identify numerous absorption lines, including CIV (1458, 1551A), FeII (2344, 2374, 2383A) at a common redshift of z=1.727.
Further analysis is ongoing.
We acknowledge the support of Chad Trujillo in obtaining these observations.
GCN Circular #11231
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
Two MASTER robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Baykal Lake (Tunka) and Blagoveschensk was pointed to the Swift GRB 100906A (Markwardt et al., GCN CIRCULAR 11227) 23 sec after Notice time (38 s after trigger time) and 43 s after Notice time (58s after trigger time) (Ivanov et al., GCN CIRCULAR 11228).
We see brightening and decay of the prompt optical emission in both polarizations.
The preliminary light curve is available at http://observ.pereplet.ru/images/GRB100906A/pre_lc.gif
This automatical phtometry calbrated by USNOB1 stars.
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11232
Myungshin Im, Changsu Choi, Hyunsung Jun, Eugene Kang (CEOU/Seoul National University), Y. Urata (NCU), P. Choi (Pomona College), T. Sakamoto (NASA/GSFC), and N. Gehrels (NASA/GSFC) on behalf of a larger collaboration
Using UKIRT, we obtained multiple sets of zYJHK images of GRB 100906A (Markwardt et al. GCN 11227) with a series of z, Y, J, H, and K filters using UKIRT. The observation started at Sept. 06, 14:23 UT or roughly 34 minutes after the BAT alert. We clearly identify an uncatalogued source in images in all the filters. The preliminary magnitude of the afterglow is J= 14.93 +- 0.02 and K=13.54 +- 0.02 (Vega), calibrated against 2MASS stars in the vicinity.
GCN Circular #11233
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100906A (trigger #433509) (Markwardt, et al., GCN Circ. 11227). The BAT ground-calculated position is RA, Dec = 28.697, 55.634 deg, which is
```
   RA(J2000)  =  01h 54m 47.4s 
   Dec(J2000) = +55d 38' 03.7" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The mask-weighted light curve shows several bright peaks. The first pair of overlapping peaks starts at ~T-0.2 sec, peaks at ~T+2 and ~T+10 sec, and almost returns to background at ~T+35 sec. There is a small peak at ~T+50 sec. Then there are four overlapping peaks from ~T+100 to ~T+118 sec. T90 (15-350 keV) is 114.4 +- 1.6 sec (estimated error including systematics).
The time-averaged spectrum from T-0.2 to T+130.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.03. The fluence in the 15-150 keV band is 1.2 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+10.48 sec in the 15-150 keV band is 10.1 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/433509/BA/
GCN Circular #11235
D.Kuvshinov, V.Kornilov, E. Gorbovskoy, V. Lipunov, A.Belinski, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich Sternberg Astronomical Institute, Moscow State University
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
Observations on MASTER robotic telescope at Tunka (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, pp. 1-7) are continued (Ivanov et al., GCN CIRCULAR 11228, Gorbovskoy et al., GCN CIRCULAR 11231). We have very smoth light curve up to 4 hours after trigger time. The power low index afterglow decay (F~T_alpha) apha is equal -0.83+-0.02 . The preliminary 20 min automatical light curve is available at http://observ.pereplet.ru/images/GRB100906A/lc_GRB100906A_30min.png (unfiltered).
This automatical pohtometry calibrated by USNOB1 stars.
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11238
D. A. Kann, A. Nicuesa Guelbenzu, F. Ludwig and B. Stecklum (TLS Tautenburg) report:
We observed the afterglow of the bright Swift GRB 100906A (Markwardt et al., GCN 11227) with the 1.34m TLS Schmidt telescope as soon as dusk set in. We obtained 3 x 300 sec images in Z, Ic, Rc, V and B each. The afterglow is clearly detected in all images.
Assuming the star at RA = 01:54:46.82, Dec. = +55:37:55.3 to have USNOB1.0 R2 = 15.70, we find the following magnitude for the afterglow:
Rc = 18.84 +/- 0.03 at 0.247478 days after the GRB.
Further observations are planned if weather permits.
This message may be cited.
GCN Circular #11239
Kamil Hornoch, Peter Kusnirak, Barbora Mikulecka, Petra Hornochova, Petr Scheirich, Tomas Kusnirak and Jan Strobl (Astronomical Institute, Czech Republic) and Petr Kubanek (IPL UV Valencia, IAA CSIC Granada) reports on behalf of larger collaboration:
We observed position of GRB100906A with Ondrejov 65cm telescope. Its optical counterpart (Markwardt et al., GCN 11227) is well detected on stacked 6x180 second R band exposure with mid-point at 2010-09-06 19:51:14 UT, with preliminary magnitude 19.5 +- 0.5 mag.
Further observations and calibrations with this as well as other instruments are ongoing.
GCN Circular #11240
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 100906A (Markwardt et al., GCN 11227) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2010-09-06 13:53:54 UT (~4.4 min after the burst). We detected the previously reported afterglow (Markwardt et al., GCN 11227; Ivanov et al., GCN 11228; Melandri et al., GCN 12229) in all the three bands.
Photometric results of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.00662    13:58:60     540.0   15.58  0.04  14.42  0.02  14.00  0.02
0.01784    14:15:09     540.0   16.52  0.05  15.35  0.03  14.98  0.04
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```

GCN Circular #11241
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
The observation time in the list reported in GCN 11240 is incorrect. We made a mistake in calculating the MID-UT. We revise as follows:

#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.00662    13:58:59     540.0   15.58  0.04  14.42  0.02  14.00  0.02
0.01784    14:15:08     540.0   16.52  0.05  15.35  0.03  14.98  0.04
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]

GCN Circular #11242
M. H. Siegel (PSU) and C. B. Markwardt (NASA/GSGC) report on behalf of the Swift/UVOT team.
The Swift/UVOT began settled observations of the field of GRB 100906A 89s after the BAT trigger (Markwardt et al., GCN Circ. 11227). Data summed from the first orbit confirms a fading optical transient at the position report by Markwardt et al. The non-detection in the UVW2 and UVM2 filters is consistent with the Gemini redshift of 1.727 reported by Tanvir et al. (GCN Circ. 11230). Observations of the GRB are continuing.
The magnitudes and 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below:
```
FILTER     T_start(s)  T_stop    Exposure     Mag/3UL
========================================================
u (fc)       146        396        245     14.93+-0.02
u            146       1305        490     15.40+-0.01
v            453       1381        116     15.97+-0.05
b            403       1330        116     16.49+-0.04
uvw1         503       1280         97     17.13+-0.11
uvm2         478       1404        115       >18.97
uvw2         429       1356        116       >19.19
=======================================================
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.36 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #11243
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 5488 s of XRT Photon Counting mode data and 7 UVOT images for GRB 100906A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 28.68397, +55.63068 which is equivalent to:
```
RA (J2000): 01h 54m 44.15s
Dec (J2000): +55d 37' 50.5"
```
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11244
A. P. Beardmore (U. Leicester) and C. B. Markwardt (NASA/GSFC) report on behalf of the Swift-XRT team:
We have analysed 16.6 ks of XRT data for GRB 100906A (Markwardt et al. GCN Circ. 11227), from 70 s to 40.2 ks after the BAT trigger. The data comprise 228 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 11243).
The X-ray light curve initially shows a large flare, peaking at a count rate of ~2000 count s^-1 at T+120s, contemporary with the late time BAT activity (Barthelmy et al., GCN Circ. 11233). It then declines rapidly before breaking to a shallower decay slope of alpha = 0.74 +/- 0.04 after T+270s. This is followed by a further break at T+10854 s to an slope of 1.96 +0.17 -0.13.
A spectrum formed from the PC mode data can be fit by an absorbed power-law with a photon index of 2.15 +/-0.08. The best-fitting absorption column is (8.1 +/- 2.5) x 10^21 cm^-2, at a redshift of 1.727 (Tanvir et al. GCN Circ. 11230), in addition to the Galactic value of 2.2 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (7.1 x 10^-11) erg cm^-2 count^-1. We do not report a WT time averaged spectral fit here as this would be affected by the spectral evolution during the flaring activity, evident in the hardness ratio.
If the light curve continues to decay at the same rate, the count rate at T+24 hours will be 5.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.4 x 10^-13 (4.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00433509.
This circular is an official product of the Swift-XRT team.
GCN Circular #11245
G. Masi (Bellatrix Astronomical Observatory, Italy) reports:
The Virtual Telescope main instrument (0.36m-f/8.7) observed this GRB afterglow on Sept. 7, 2010 at 03:35 Universal Time.
Unfiltered photometry, using R mags from USN0 B1.0 for the reference stars, provided a magnitude of 19.5, while the astrometry provided the following end figures:
```
RA: 44.10s
Decl.: 49.5"
(J2000.0)
```
in excellent agreement with UVOT finding (GCN 11227)
This message can be cited.
GCN Circular #11247
D. A. Kann, A. Nicuesa Guelbenzu, F. Ludwig and B. Stecklum (TLS Tautenburg) report:
Further to Kann et al. (GCN 11238), we continued monitoring the afterglow of GRB 100906A (Markwardt et al., GCN 11227) with the 1.34m TLS Schmidt telescope under excellent conditions in intermittent intervals all night. Beyond the 15 detections reported in Kann et al. (GCN 11238), we obtained further nine Rc images (300 sec each) spread over the night, as well as one further Ic (300 sec) and one further Z (600 sec) image at the end of the night, during morning twilight. The afterglow is clearly detected in all our images.
Due to crowding, we use SExtractor under GAIA to subtract background mesh maps, then perform aperature photometry without needing to measure the surrounding sky background (which is around 0). Errors are estimates based on how clear the detection is, the last Rc frame was taken in strong twilight already. We assume R2 = 15.9 for the USNOB1.0 star at RA = 01:54:55.247, Dec. = +55:38:31.40, and measure:
```
Midtime		Rc	dRc
0.247478	18.97	0.05
0.251517	19.06	0.05
0.255556	19.04	0.05
0.390570	19.08	0.05
0.430154	19.27	0.05
0.451022	19.18	0.05
0.498974	19.64	0.05
0.521231	19.62	0.05
0.525421	19.67	0.05
0.554113	19.80	0.05
0.570108	19.97	0.15
```
The afterglow seems to transition from a plateau phase (0.25 - 0.4 days) to a much steeper decay.
Further observations are improbable due to upcoming inclement weather.
This message may be cited.
GCN Circular #11248
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 13:49:27.63 UT on 06 September 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100906A (trigger 305473769 / 100906576) which was also detected by the Swift-BAT (Markwardt et al. 2010, GCN 11227) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 95 degrees.
The GBM light curve shows several bright peaks with a duration (T90) of about 105 s (50-300 keV). The time-averaged spectrum from T0 to T0+122 s is best fit by a Band function with Epeak = 106.0 +17.5/-20.2 keV, alpha = -1.34 +0.08/-0.06, and beta = -1.98 +0.06/-0.07. (Castor C-stat 1044 for 479 d.o.f.)
The event fluence (10-1000 keV) in this time interval is (2.64E-05 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10.1 s in the 10-1000 keV band is 14.45 +/- 0.29 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11249
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 100906A (Markwardt et al., GCN 11227) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 2010-09-06 17:20:53 UT (~3.5 h after the burst). We detected the previously reported afterglow (Markwardt et al., GCN 11227; Ivanov et al., GCN 11228; Melandri et al., GCN 12229) in all the three bands.
Photometric results of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.15249    17:29:02     840.0    19.3   0.1   18.3   0.1   17.6   0.1
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #11250
The AMI Large Array (Cambridge, UK) was used to observe the field of GRB 100906A (Markwardt et al, GCN11227) in the band 13.5 to 17.2 GHz from 2010 Sep 06 23h31m to Sept 07 03h35m (starting 9h42m after the trigger). The weather conditions were very poor and the noise levels consequently high; no detection of GRB 100906A was made, with a formal flux density at the UVOT position from GCN11227 of 380 microJy and an rms noise of 136 microJy.
This message is quotable in publications.
Guy Pooley, on behalf of the AMI collaboration
GCN Circular #11251
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 100906A, (Swift/BAT trigger=3D433509: Markwardt et.al, GCN 11227; Barthelmy et.al, GCN 11233) triggered Konus-Wind at T0=3D49770.732s UT (13:49:30.732)
The burst light curve started with a complex ~20s-long structure, followed by a weaker softer emission episode starting at ~T0+100 s. The total duration of the burst is ~150 s. The emission is seen up to 2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB100906_T49770/
As observed by Konus-Wind the burst had a fluence of (2.6 =B1 0.4)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+9.728s, of (2.7 =B1 0.3)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+139.264 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha =3D -1.5 (-0.2, +0.4), the high energy photon index beta =3D -2.3 (<-2.0), the peak energy Ep =3D 142(-60, +119) keV (chi2 =3D 84/60 dof).
The spectrum of the most intense part of the burst (measured from T0+0.256 to T0+16.384 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha =3D -1.1 (-0.1, +0.1), the high energy photon index beta =3D -2.2 (-0.3, +0.2), the peak energy Ep =3D 180(-40, +45) keV (chi2 =3D 68/60 dof).
The spectrum of the second bursting episode (measured from T0+98.304 to T0+122.880 s) is best fit in the 20 keV - 2 MeV range by the simple power law model with the photon index =3D 2.55 (-0.2, +0.25), chi2 =3D 63/62 dof.
Assuming z=3D1.727 (Tanvir, Wiersema, and Levan et al., GCN 11230) and a standard cosmology model with H_0 =3D 70 km/s/Mpc, Omega_M =3D 0.27, Omega_Lambda =3D 0.73, the isotropic energy release E_iso =3D (2.2 =B1 0.4)x1053 erg, the peak luminosity (L_iso)_max =3D (5.7 =B1 0.6)x1052 erg/s.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #11252
J. Kelemen and K. Sarneczky (Konkoly Observatory) Z. Kuli and B. Ujhelyi (Hungarian Astronomical Association)
on behalf of the GRB OT observing program at the Konkoly Observatory.
On 09 september 2010 02:25:57 UT (45390 s after the burst) we observed the field of GRB 100906A detected by Swift (trigger=433509; Markwardt et al., GCN 11227) with a 60/90 cm Schmidt telescope located at the Mountain Station of the Konkoly Observatory using R filter. The exposure time of the CCD images were 300 s. We clearly detected the fading afterglow at RA(J2000) = 01h 54m 44.12s Dec(J2000) = +55d 37' 49.3" (astrometry with ASTROMETRICA using UCAC3 catalogue.) with an uncertainty of 0.2 arcseconds.
```
Time      Mag     Error.      Flag.
[s]       [R]    [1-sigma]  
-------------------------------------
45390    20.6      0.1          -
45709    20.7      0.1          -
46028    21.3      0.1          -
-------------------------------------
```
The above magnitudes have not been corrected for the Galactic extinction.
GCN Circular #11253
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report:
GRAS-007 PlaneWave CDK 17" F6.8 telescope and STL-11000M CCD camera (Global-Rent-a-Scope, Nerpio, Spain) were used to detect GRB 100906A optical afterglow. The observations were started at 2010-09-07 02:13:24 (UT) and stopped at 2010-09-07 03:40:53 (UT). A number of unfiltered images with 120 sec and 600 sec exposure time were made. The afterglow was detected at following position RA 01 54 44.12 and DEC +55 37 49.4 consistent those given by Melandri A. et al. (GCN 11229) to within positional errors.
The following magnitude was obtained from the observations using USNO-B1.0 1456-0062169 (R = 15.70) as the comparison:
```
+T0 (hour)		Filter	Exp (sec)	Mag	Mag err	Limit
			
13:00:24 (midpoint)	unfiltered	3x600s	19.8	0.4	21.0
```
A JPG image of the 3x600 sec observations is available at the following URL: http://cutenews.kassiopeia.net/data/upimages/GRB100906A.jpg
GCN Circular #11254
A. Tkachenko (IKI), I. Khamitov (TUG), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
The optical counterpart of GRB 100906A (GCN 11227) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at Sep 06, 19:28 UT, i.e. ~5.64 hours after the burst, using TFOSC.
Three series of BRI frames were made under moderate weather conditions. The afterglow is clearly detected in all images.
Assuming the star at RA = 01:54:46.82, Dec. = +55:37:55.3 to have USNOB1.0 R2MAG = 15.70, we estimated the following magnitudes for the OT on combined images of every set:
```
 t-t0     band   mag   err	
 6.048 h    R   18.80  0.02
 9.610 h    R   19.08  0.02
13.554 h    R   19.69  0.04
```
The color of the afterglow changes from (B-R)=1.21 to (B-R)=1.31 at the beniginning and at the end of our observations.
GCN Circular #11259
The AMI Large Array (Cambridge, UK) was used to make two further observations of the field of GRB 100906A (Markwardt et al, GCN11227) in the band 13.5 to 17.2 GHz (GCN11250 reports the first observation).
```
date/time                              flux   sigma / microJy
2010 Sep 08 06h51m to Sep 08 07h51m     137     140
2010 Sep 08 22h03m to Sep 09 00h18m     465      70
```
The GRB is clearly detected in the second of these observations, mean time 57h17m after the trigger.
(A radio source catalogued in NVSS, 87GB, 7C is also visible in the field near 01 55 11 +55 35 20 (J2000), about 4.5 arcmin from the GRB.)
This message is quotable in publications.
Guy Pooley, on behalf of the AMI collaboration
GCN Circular #11267
M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A.Pozanenko (IKI), N. Parakhin, S. Velichko, N. Borachok (IC AMER) V. Petkov (Baksan Neutrino Observatory INR RAS) on behalf of larger GRB follow up collaboration report:
We observed the field of Swift GRB 100906A (Markwardt et al., GCN 11227) with Zeiss-2000 telescope of Mt.Terskol observatory starting Sep. 06 (UT) 23:56. We obtained images in g,V, r filters. The afterglow (Markwardt et al. GCN 11227, Ivanov et al. GCN 11228, Melandri et al. GCN 11229) is clealy detected in all filters. The preliminary photometry is based on GSC2.3 catalog and Jordi et al. (2006) UBVRcIc -> ugriz transformations:
```
T0+      Filter,     Exp.       OT
(d)

0.4213   r            6x120   19.43 +/-0.03
0.4626   g         10x120    20.11 +/-0.02
0.4785   V          7x120    19.77 +/-0.03
```
GCN Circular #11291
Y.Asaoka, S.Hirai, T.Itoh, M.Masuda, Y.Morimoto, K.Ota, M.Sasaki (ICRR,Univ.Tokyo), D.Kogure, S.Ogawa, H.Tsujikawa (Toho Univ.), P.Binder (Univ.Hawaii Hilo), J.Learned (Univ.Hawaii Manoa) report on behalf of the Ashra-1 collaboration:
We have searched for optical emission in the field of GRB100906A (Markwardt, et al., GCN Circ. 11227) around the BAT-triggered GRB time (T0) with one of the light collector units in the Ashra-1 detector (http://www.icrr.u-tokyo.ac.jp/~ashra) on Mauna Loa on Hawaii Island (latitude = 19.5412 deg. N, longitude =155.5676 deg. W, altitude =3330m).
The Ashra-1 light collector unit has the achieved resolution of a few arcmin, viewing 42 degree circle region of which center is located at Alt = 60 deg, Azi = 0 deg. The sensitive region of wavelength is similar to the B-band.
We quickly analyzed 200 images covering the field of GRB100906A every 6s with 4s exposure time respectively during the observation between T0-600s and T0+600s. We detected no new optical object within the PSF resolution around the GRB100906A determined by Swift-UVOT (Markwardt, et al., GCN Circ. 11227)
As a result of our preliminary analysis, the following 3-sigma limiting magnitudes are derived:
```
----------------------------------------------------------------------
Starting&Ending Exp.Time,  3-sigma Limit. Mag.
----------------------------------------------------------------------
-593.2 	 -589.2 		   12.1
-587.3 	 -583.3 		   12.2
    .        .                       .
    .        .                       .
  -1.4      2.6 		   12.0
   4.5      8.5 		   12.1
    .        .                       .
    .        .                       .
 590.5    594.5 		   12.2
 596.4    600.4 		   12.1
----------------------------------------------------------------------
```
The limiting magnitudes were estimated in comparison with stars in Tycho-2 Catalog to be distributed between 12.0 and 12.2 as above partly listed.
Figures of limiting optical magnitudes vs time comparing with other measurements and can be found at: http://www.icrr.u-tokyo.ac.jp/~ashra/GRB100906A.
This message may be cited.
GCN Circular #11340
Jan Strobl (1,2), Martin Blazek (1,2), Martin Jelinek (3), Cyril Polasek (1), Petr Kubanek (3,4), Martin Nekola (1), Matus Kocka (1) and Rene Hudec (1,2) (1. ASU AVCR Ondrejov, 2. FEL CVUT Praha, 3. IAA Granada, 4. IPL UV Valencia)
We report on the observation of the Swift GRB 100906A (Markwardt et al., GCN 11227) with the 0.5m telescope D50 in Ondrejov (Czech Republic), starting at 21:17:37 UT, i.e. ~7.5h after the trigger. Eventually, six hours of observational data were obtained, with the last image taken at 3:23:20 UT.
We clearly detect the afterglow reported by Ivanov et al. (GCN 11228), and at the the beginning of our sequence (coadded first 7x 20s, exp. mean time = 21:19 UT) we measure a magnitude 18.7 +- 0.2.
This message can be cited.
GCN Circular #11395
A. Volnova (SAI MSU), A. Pozanenko (IKI), M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), V. Rumyantsev, K. Grankin (CrAO), A. Erofeeva, G. Kornienko (UAFO), I. Molotov (ISON), E. Klunko (ISTPM), Ibrahimov (MAO), B. Satovski (Astrotel) on behalf of GRB follow up collaboration report:
We observed the optical afterglow (Markwardt et al. GCN 11227, Ivanov et al. GCN 1128) of GRB 100906A (Markwardt et al. GCN 11227) with the following telescopes: GAS-250 (Ussuriysk Astrophysical Observatory), AZT-14 (Mondy observatory), Zeiss-2000 and Zeiss-600 (Mt.Terskol observatory), Shajn telescope (CrAO) and AZT-22 (Maidanak observatory). Observations started at 14:02 UT, i.e. approximately 13 minutes after the burst trigger. Observations in different optical bands (B, V, R, I, g, r) cover the period of t-t_0 from 0.12 up to 2.46 days. The photometry calibration was made against several stars of GSC2.3 catalog. The light curve of GRB 100906A afterglow can be found at http://grb.rssi.ru/GRB100906A/GRB100906A_lc.png .
From the R band of light curve one can see a clear break around ~0.5 days after the burst with alpha_1 = -0.7 +/- 0.1 before and alpha_2 = -2.0 +/- 0.3 after break. Color index B-R measured between 0.22 and 0.24 days after the burst does not change within the error bars and is equal to 1.33 +/- 0.12, while the B-R index measured at 1.26 days after the burst trigger is equal to 1.61+/- 0.19.
1305.1620 from 9 May 13
E. S. Gorbovskoy et al.: The MASTER-II Network of Robotic Optical Telescopes. First Results
The main stages in the creation of the Russian segment of the MASTER network of robotic telescopes is described. This network is designed for studies of the prompt optical emission of gamma- ray bursts (GRBs; optical emission synchronous with the gamma-ray radiation) and surveys of the sky aimed at discovering uncataloged objects and photometric studies for various programs. The first results obtained by the network, during its construction and immediately after its completion in December 2010, are presented. Eighty-nine alert pointings at GRBs (in most cases, being the first ground telescopes to point at the GRBs) were made from September 2006 through July 2011. The MASTER network holds first place in the world in terms of the total number of first pointings, and currently more than half of first pointings at GRBs by ground telescopes are made by the MASTER network. Photometric light curves of GRB 091020, GRB 091127, GRB 100901A, GRB 100906A, GRB 10925A, GRB 110106A, GRB 110422A, and GRB 110530A are presented. It is especially important that prompt emission was ob- served for GRB 100901A and GRB 100906A, and thar GRB 091127, GRB 110422A, and GRB 110106A were observed from the first seconds in two polarizations. Very-wide-field cameras carried out synchronous observations of the prompt emission of GRB 081102, GRB 081130B, GRB 090305B, GRB 090320B, GRB 090328, and GRB 090424. Discoveries of Type Ia supernovae are ongoing (among them the brightest supernova in 2009): 2008gy, 2009nr, 2010V, and others. In all, photometry of 387 supernovae has been carried out, 43 of which were either discovered or first observed with MASTER telescopes; more than half of these are Type Ia supernovae. Photometric studies of the open clusters NGC 7129 and NGC 7142 have been conducted, leading to the discovery of 38 variable stars.
1401.3221 from 15 Jan 14
M.V. Pruzhinskaya et al.: Optical polarization observations with the MASTER robotic net
We present results of optical polarization observations performed with the MASTER robotic net for three types of objects: gamma-ray bursts, supernovae, and blazars. For the gamma-ray bursts GRB100906A, GRB110422A, GRB121011A, polarization observations were obtained during very early stages of optical emission. For GRB100906A it was the first prompt optical polarization observation in the world. Photometry in polarizers is presented for Type Ia Supernova 2012bh during 20 days, starting on March 27, 2012. We find that the linear polarization of SN 2012bh at the early stage of the envelope expansion was less than 3%. Polarization measurements for the blazars OC 457, 3C 454.3, QSO B1215+303, 87GB 165943.2+395846 at single nights are presented. We infer the degree of the linear polarization and polarization angle. The blazars OC 457 and 3C 454.3 were observed during their periods of activity. The results show that MASTER is able to measure substantially polarized light; at the same time it is not suitable for determining weak polarization (less than 5%) of dim objects (fainter than 16$^m$). Polarimetric observations of the optical emission from gamma-ray bursts and supernovae are necessary to investigate the nature of these transient objects.

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Jochen Greiner, last update: 15-Jan-2014 [Disclaimer]