Gamma-ray Burst 090912

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 15:50:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     362633,   Seg_Num: 0
GRB_RA:          188.092d {+12h 32m 22s} (J2000),
                 188.202d {+12h 32m 48s} (current),
                 187.521d {+12h 30m 05s} (1950)
GRB_DEC:         +61.513d {+61d 30' 45"} (J2000),
                 +61.459d {+61d 27' 33"} (current),
                 +61.788d {+61d 47' 18"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3813 [cnts]    Image_Peak=127 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       25335 [cnts]
BKG_TIME:        57010.92 SOD {15:50:10.92} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15086 TJD;   255 DOY;   09/09/12
GRB_TIME:        57029.86 SOD {15:50:29.86} UT
GRB_PHI:         -105.01 [deg]
GRB_THETA:        33.88 [deg]
SOLN_STATUS:     0x20000083
RATE_SIGNIF:     10.48 [sigma]
IMAGE_SIGNIF:    6.62 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -4  +0  +0 -51  +0 
SUN_POSTN:       170.82d {+11h 23m 17s}   +3.96d {+03d 57' 23"}
SUN_DIST:         58.97 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.07d {+05h 48m 17s}  +26.03d {+26d 01' 37"}
MOON_DIST:        72.39 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.94, 55.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      148.62, 56.42 [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:        This is a GRB.  
COMMENTS:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 155.31,18.73 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=274463431).

red DSS finding chart ps-file

GCN NOTICE

ITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 09 15:50:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     274463431
GRB_RA:          236.217d {+15h 44m 52s} (J2000),
                 236.318d {+15h 45m 16s} (current),
                 235.696d {+15h 42m 47s} (1950)
GRB_DEC:         +27.450d {+27d 26' 60"} (J2000),
                 +27.420d {+27d 25' 12"} (current),
                 +27.606d {+27d 36' 21"} (1950)
GRB_ERROR:       19.97 [deg radius, statistical plus systematic]
GRB_INTEN:       79 [cnts/sec]
DATA_SIGNIF:     7.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15086 TJD;   255 DOY;   09/09/12
GRB_TIME:        57029.10 SOD {15:50:29.10} UT
GRB_PHI:         298.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.25
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      85%  GRB
2nd_MOST_LIKELY:   9%  Distant Particles
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       170.82d {+11h 23m 17s}   +3.96d {+03d 57' 23"}
SUN_DIST:         66.48 [deg]   Sun_angle= -4.4 [hr] (East of Sun)
MOON_POSTN:       87.07d {+05h 48m 17s}  +26.03d {+26d 01' 37"}
MOON_DIST:       118.91 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:       43.72, 51.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      224.99, 45.75 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.
COMMENTS:        This trigger occurred at longitude,latitude = 291.83,18.55 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 09 15:51:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     274463431
GRB_RA:          222.450d {+14h 49m 48s} (J2000),
                 222.542d {+14h 50m 10s} (current),
                 221.976d {+14h 47m 54s} (1950)
GRB_DEC:         +41.510d {+41d 30' 36"} (J2000),
                 +41.470d {+41d 28' 13"} (current),
                 +41.716d {+41d 42' 58"} (1950)
GRB_ERROR:       16.46 [deg radius, statistical only]
DATA_SIGNIF:     7.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15086 TJD;   255 DOY;   09/09/12
GRB_TIME:        57029.10 SOD {15:50:29.10} UT
GRB_PHI:         316.00 [deg]
GRB_THETA:        82.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       170.82d {+11h 23m 17s}   +3.96d {+03d 57' 23"}
SUN_DIST:         59.42 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:       87.07d {+05h 48m 18s}  +26.03d {+26d 01' 37"}
MOON_DIST:       100.92 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:       71.32, 61.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      199.91, 54.01 [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:     Sat 12 Sep 09 15:50:59 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     274463431
GRB_RA:          212.683d {+14h 10m 44s} (J2000),
                 212.789d {+14h 11m 09s} (current),
                 212.138d {+14h 08m 33s} (1950)
GRB_DEC:         +32.317d {+32d 18' 60"} (J2000),
                 +32.271d {+32d 16' 16"} (current),
                 +32.552d {+32d 33' 06"} (1950)
GRB_ERROR:       25.60 [deg radius, statistical plus systematic]
GRB_INTEN:       79 [cnts/sec]
DATA_SIGNIF:     7.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15086 TJD;   255 DOY;   09/09/12
GRB_TIME:        57029.10 SOD {15:50:29.10} UT
GRB_PHI:         317.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.42
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   7%  Distant Particles
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       170.82d {+11h 23m 17s}   +3.96d {+03d 57' 23"}
SUN_DIST:         48.40 [deg]   Sun_angle= -2.8 [hr] (East of Sun)
MOON_POSTN:       87.07d {+05h 48m 17s}  +26.03d {+26d 01' 37"}
MOON_DIST:       102.08 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:       54.50, 72.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      196.15, 42.22 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 291.83,18.55 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 15:54:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     362633,   Seg_Num: 0
GRB_RA:          188.092d {+12h 32m 22s} (J2000),
                 188.202d {+12h 32m 48s} (current),
                 187.521d {+12h 30m 05s} (1950)
GRB_DEC:         +61.513d {+61d 30' 45"} (J2000),
                 +61.459d {+61d 27' 33"} (current),
                 +61.788d {+61d 47' 18"} (1950)
GRB_DATE:        15086 TJD;   255 DOY;   09/09/12
GRB_TIME:        57029.86 SOD {15:50:29.86} UT
TRIGGER_INDEX:   148
GRB_PHI:         -105.01 [deg]
GRB_THETA:        33.88 [deg]
DELTA_TIME:      26.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     10.48 [sigma]
IMAGE_SIGNIF:    6.62 [sigma]
LC_URL:          sw00362633000msb.lc
SUN_POSTN:       170.82d {+11h 23m 17s}   +3.96d {+03d 57' 20"}
SUN_DIST:         58.97 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.11d {+05h 48m 25s}  +26.03d {+26d 01' 30"}
MOON_DIST:        72.37 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.94, 55.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      148.62, 56.42 [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:        This is a GRB.  
COMMENTS:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 155.31,18.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:03:49 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57822.43 SOD {16:03:42.43} UT,   792.6 [sec] since BAT Trigger Time
COUNTS:          3    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:06:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.245d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57825.67 SOD {16:03:45.67} UT,   795.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.268
N_STARS:         52
X_OFFSET:        616 [pixels]
Y_OFFSET:        455 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1414 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00362633000msufc0795.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 07"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.25d {+05h 48m 59s}  +26.02d {+26d 01' 03"}
MOON_DIST:        72.32 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.92, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:07:28 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     362633,   Seg_Num: 0
GRB_RA:          188.0422d {+12h 32m 10.12s} (J2000),
                 188.1525d {+12h 32m 36.59s} (current),
                 187.4712d {+12h 29m 53.09s} (1950)
GRB_DEC:         +61.4848d {+61d 29' 05.2"} (J2000),
                 +61.4313d {+61d 25' 52.8"} (current),
                 +61.7607d {+61d 45' 38.3"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57844.00 SOD {16:04:04.00} UT,   814.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 07"}
SUN_DIST:         58.94 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.25d {+05h 49m 00s}  +26.02d {+26d 01' 02"}
MOON_DIST:        72.30 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.99, 55.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      148.63, 56.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:06:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.245d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57825.67 SOD {16:03:45.67} UT,   795.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.268
N_STARS:         52
X_OFFSET:        616 [pixels]
Y_OFFSET:        455 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1414 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00362633000msufc0795.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 07"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.25d {+05h 48m 59s}  +26.02d {+26d 01' 03"}
MOON_DIST:        72.32 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.92, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:07:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.245d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57825.67 SOD {16:03:45.67} UT,   795.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.268
N_STARS:         52
X_OFFSET:        616 [pixels]
Y_OFFSET:        455 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1414 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00362633000msufc0795.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 07"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.25d {+05h 49m 00s}  +26.02d {+26d 01' 02"}
MOON_DIST:        72.31 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.92, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:08:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
ROLL:            200.245d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57825.67 SOD {16:03:45.67} UT,   795.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     274464230
X_OFFSET:        935 [pixels]
Y_OFFSET:        774 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       934
BINNING_INDEX:   1
IM_URL:          sw00362633000msuni0801.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 06"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.26d {+05h 49m 03s}  +26.02d {+26d 01' 00"}
MOON_DIST:        72.31 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.92, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:08:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.108d {+12h 32m 26s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
ROLL:            200.245d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57825.67 SOD {16:03:45.67} UT,   795.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     274464230
X_OFFSET:        935 [pixels]
Y_OFFSET:        774 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       934
BINNING_INDEX:   1
IM_URL:          sw00362633000msuni0801.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 06"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.27d {+05h 49m 04s}  +26.02d {+26d 00' 59"}
MOON_DIST:        72.31 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.92, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:10:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.103d {+12h 32m 25s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.239d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57979.07 SOD {16:06:19.07} UT,   949.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.806
N_STARS:         88
X_OFFSET:        376 [pixels]
Y_OFFSET:        215 [pixels]
X_MAX:           1815 [pixels]
Y_MAX:           1654 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00362633000msufc0949.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 04"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.29d {+05h 49m 08s}  +26.02d {+26d 00' 56"}
MOON_DIST:        72.30 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.93, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:10:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.103d {+12h 32m 25s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.239d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57979.07 SOD {16:06:19.07} UT,   949.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.806
N_STARS:         88
X_OFFSET:        376 [pixels]
Y_OFFSET:        215 [pixels]
X_MAX:           1815 [pixels]
Y_MAX:           1654 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00362633000msufc0949.fits
SUN_POSTN:       170.83d {+11h 23m 19s}   +3.95d {+03d 57' 04"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.29d {+05h 49m 08s}  +26.02d {+26d 00' 56"}
MOON_DIST:        72.30 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.93, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:11:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.103d {+12h 32m 25s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
POINT_ROLL:      200.239d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57979.07 SOD {16:06:19.07} UT,   949.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.806
N_STARS:         88
X_OFFSET:        376 [pixels]
Y_OFFSET:        215 [pixels]
X_MAX:           1815 [pixels]
Y_MAX:           1654 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00362633000msufc0949.fits
SUN_POSTN:       170.83d {+11h 23m 20s}   +3.95d {+03d 57' 03"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.29d {+05h 49m 10s}  +26.02d {+26d 00' 54"}
MOON_DIST:        72.30 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.93, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:12:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.103d {+12h 32m 25s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
ROLL:            200.239d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57979.07 SOD {16:06:19.07} UT,   949.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     274464384
X_OFFSET:        935 [pixels]
Y_OFFSET:        774 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       934
BINNING_INDEX:   1
IM_URL:          sw00362633000msuni0955.fits
SUN_POSTN:       170.83d {+11h 23m 20s}   +3.95d {+03d 57' 03"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.30d {+05h 49m 12s}  +26.01d {+26d 00' 52"}
MOON_DIST:        72.29 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.93, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:12:10 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     362633,   Seg_Num: 0
GRB_RA:          188.0422d {+12h 32m 10.12s} (J2000),
                 188.1525d {+12h 32m 36.59s} (current),
                 187.4712d {+12h 29m 53.09s} (1950)
GRB_DEC:         +61.4842d {+61d 29' 03.1"} (J2000),
                 +61.4307d {+61d 25' 50.6"} (current),
                 +61.7601d {+61d 45' 36.2"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57844.00 SOD {16:04:04.00} UT,   814.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       170.83d {+11h 23m 20s}   +3.95d {+03d 57' 02"}
SUN_DIST:         58.94 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.30d {+05h 49m 13s}  +26.01d {+26d 00' 52"}
MOON_DIST:        72.28 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.99, 55.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      148.63, 56.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
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:        This position was enhanced using UVOT field astrometry

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 12 Sep 09 16:12:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     362633,   Seg_Num: 0
POINT_RA:        188.103d {+12h 32m 25s} (J2000)
POINT_DEC:       +61.536d {+61d 32' 09"} (J2000)
ROLL:            200.239d
IMG_START_DATE:  15086 TJD;   255 DOY;   09/09/12
IMG_START_TIME:  57979.07 SOD {16:06:19.07} UT,   949.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     274464384
X_OFFSET:        935 [pixels]
Y_OFFSET:        774 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       934
BINNING_INDEX:   1
IM_URL:          sw00362633000msuni0955.fits
SUN_POSTN:       170.83d {+11h 23m 20s}   +3.95d {+03d 57' 02"}
SUN_DIST:         59.00 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       87.31d {+05h 49m 13s}  +26.01d {+26d 00' 52"}
MOON_DIST:        72.29 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      126.93, 55.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      148.60, 56.44 [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.

GCN Circular #9905
T. N. Ukwatta (GSFC/GWU), S. D. Barthelmy (GSFC), M. M. Chester (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), K. L. Page (U Leicester), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), R. L. C. Starling (U Leicester) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 15:50:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090912 (trigger=362633). Swift executed a delayed slewed to the burst. The BAT on-board calculated location is RA, Dec 188.092, +61.513, which is
```
   RA(J2000)  =  12h 32m 22s
   Dec(J2000) = +61d 30' 45"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks at T+0 and at T+90 with a total duration of about 130 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 16:03:42.4 UT, 792.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 188.0422, 61.4843 which is equivalent to:
```
   RA(J2000)  = 12h 32m 10.13s
   Dec(J2000) = +61d 29' 03.5"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 134 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 (1.28e+20 cm^-2, Kalberla et al. 2005), with an excess column of 6.2 (+4.43/-3.60) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 795 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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 #9906
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1374 s of XRT Photon Counting mode data and 2 UVOT images for GRB 090912, 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 = 188.04297, +61.48454 which is equivalent to:
```
RA (J2000): 12h 32m 10.31s
Dec (J2000): +61d 29' 04.4"
```
with an uncertainty of 1.8 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 #9907
Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports to the AAVSO International High Energy Network the following optical observations of the field of GRB090912 (GCN Circ. #9905, Ukwatta et al.):
A. Oksanen reports an upper limit on the optical afterglow of CR=21.6, measured relative to USNO-A2.0 1500-05568008 (R=15.7). The X-ray afterglow position (Beardmore et al., GCN #9906) was observed using the 0.4-m Hankasalmi Observatory RC telescope with an SBIG STL-1001E CCD camera and clear filter. A total of 57 one-minute exposures were obtained, with the mid-point of the exposures at 2009 Sept 12 19:33 UT, approximately 3.7 hours post-burst. Two faint stars near the burst location are present in DSS2 images, but there is no transient source at the burst location to a limit of CR=21.6.
A detailed report of these observations may be found at the following URL: ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090912_2455087.38910_.txt
A fits image is also available at ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090912_2455087.38910_.fits
The AAVSO thanks the Curry Foundation for its support of the AAVSO International High Energy Network.
GCN Circular #9908
P.A. Curran (MSSL-UCL) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090912 796s after the BAT trigger (Ukwatta et al., GCN 9905). No optical afterglow consistent with the enhanched Swift XRT position (Beardmore et al., GCN 9906) is detected in the UVOT exposures. Preliminary 3-sigma upper limits, using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627), for the first finding chart (FC) and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)     Exp(s)      Mag

white          796          946           147         >20.50 (FC)
white          796          7707          608         >21.09
v              1129         8118          294         >19.04
b              1228         7502          254         >19.91
u              1204         7297          313         >19.58
w1             1179         7092          313         >19.82
m2             6688         8273          344         >19.78
w2             7713         7913          197         >19.78
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #9909
T. N. Ukwatta (GSFC/GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,we report further analysis of BAT GRB 090912 (trigger #362633) (Ukwatta, et al., GCN Circ. 9905). The BAT ground-calculated position is RA, Dec = 188.046, 61.475 deg which is
```
   RA(J2000)  =  12h 32m 11.1s
   Dec(J2000) = +61d 28' 29.4"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%.
The mask-weighted light curve shows two peaks. The first start around T-4 sec, shows three sub peaks at ~T+0 sec, ~T+4 sec, and ~T+7 sec, and ends around T+25 sec. The second peak starts at ~T+70 sec, peaks at ~T+88, and ends around T+145 sec. T90 (15-350 keV) is 144.0 +- 22.6 sec (estimated error including systematics).
The time-averaged spectrum from T-15.9 to T+160.1 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.91 +- 0.44, and Epeak of 69.3 +- 19.5 keV (chi squared 42.50 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.5 +- 0.3 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+87.56 sec in the 15-150 keV band is 1.0 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.66 +- 0.09 (chi squared 52.84 for 57 d.o.f.). 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/362633/BA/
GCN Circular #9910
Sbarufatti B., Mangano V. (INAF-IASFPA) and T. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
We have analyzed the first 22.5 ks of of Swift-XRT data of GRB 090912 (trigger 362633; Ukwatta, et al., GCN Circ. 9905). The data are entirely in Photon Counting (PC) mode, from T+806 s to T+66 ks. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 9906).
The 0.3-10 keV X-ray light curve is best fitted by a power-law with decay index -0.75+/-0.03. Faint flaring activity is detected along the decay. If decaying at the present rate, the predicted rate for T+ 48h is 1.0e-2 counts/s.
The average spectrum is best fit by a power-law with index 2.1+/-0.1. The absorbing column is NH = (5.2+/-0.7)E20 cm^-2, in excess with respect to the Galactic value of 1.3E20 cm^-2 (Kalberla et al. 2005). The average observed (unabsorbed) fluxes are 3.0(5.7)E-12 ergs cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00362633 .
This circular is an official product of the Swift-XRT team.
GCN Circular #9919
V. Rumyantsev, V.Biryukov (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 090912 (Ukwatta et al., GCN 9905) with Zeiss-600 telescope of SAI MSU Crimean branch in R-filter on Sep.12 between (UT) 17:41:36 - 19:08:10. Within XRT error circle (Beardmore et al., GCN 9906) we do not detect any source. However in a stacked image we detect faint source at the coordinates RA(J2000)= 12 32 09.82 Dec(J2000)= +61 29 04.54 with uncertainty of 0.5 arcsec. It is 3.5" apart from XRT center of the circle of 1.8" radius. We suggest the detected source as afterglow candidate and urge deep observation to confirm variable nature of the source.
The photometry of the source against nearby USNO-B1.0 star 1515-0196640 RA(J2000)= 12:32:18.77 Dec(J2000)= +61:30:00.3 assuming R=19.06 is following:
```
T0+     Filter, Exposure, mag.,     err.
(d)                (s)

0.1086  R     4620     21.8 +/- 0.3 
```
GCN Report 251.1
GCN_Report 251.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_251_1.pdf by T. Ukwatta at GSFC/GWU titled: "Final Results on Swift GRB 090912"

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Jochen Greiner, last update: 13-Oct-2009 [Disclaimer]