Gamma-ray Burst 101213A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:49:25 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     313930162
GRB_RA:          246.883d {+16h 27m 32s} (J2000),
                 247.014d {+16h 28m 03s} (current),
                 246.288d {+16h 25m 09s} (1950)
GRB_DEC:         +10.033d {+10d 01' 60"} (J2000),
                 +10.009d {+10d 00' 34"} (current),
                 +10.144d {+10d 08' 38"} (1950)
GRB_ERROR:       19.58 [deg radius, statistical plus systematic]
GRB_INTEN:       148 [cnts/sec]
DATA_SIGNIF:     7.40 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38960.80 SOD {10:49:20.80} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:       120.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       260.55d {+17h 22m 11s}  -23.15d {-23d 09' 09"}
SUN_DIST:         35.71 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      348.71d {+23h 14m 51s}   +0.75d {+00d 45' 14"}
MOON_DIST:       101.38 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       25.16, 36.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      243.09, 31.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 254.25,-17.80 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:49:32 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     313930162
GRB_RA:          237.650d {+15h 50m 36s} (J2000),
                 237.772d {+15h 51m 05s} (current),
                 237.092d {+15h 48m 22s} (1950)
GRB_DEC:         +19.333d {+19d 19' 60"} (J2000),
                 +19.301d {+19d 18' 03"} (current),
                 +19.483d {+19d 29' 00"} (1950)
GRB_ERROR:       11.08 [deg radius, statistical plus systematic]
GRB_INTEN:       183 [cnts/sec]
DATA_SIGNIF:     13.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38960.80 SOD {10:49:20.80} UT
GRB_PHI:          37.00 [deg]
GRB_THETA:       125.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.95
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       260.55d {+17h 22m 11s}  -23.15d {-23d 09' 09"}
SUN_DIST:         47.92 [deg]   Sun_angle= 1.5 [hr] (West of Sun)
MOON_POSTN:      348.71d {+23h 14m 51s}   +0.75d {+00d 45' 16"}
MOON_DIST:       109.45 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       32.01, 48.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      229.90, 38.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 254.25,-17.80 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:49:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     313930162
GRB_RA:          241.600d {+16h 06m 24s} (J2000),
                 241.730d {+16h 06m 55s} (current),
                 241.007d {+16h 04m 02s} (1950)
GRB_DEC:         +11.050d {+11d 03' 00"} (J2000),
                 +11.021d {+11d 01' 16"} (current),
                 +11.184d {+11d 11' 01"} (1950)
GRB_ERROR:       6.84 [deg radius, statistical only]
DATA_SIGNIF:     14.30 [sigma] 
DATA_INTERVAL:   4.096 [sec]   
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38960.80 SOD {10:49:20.80} UT
GRB_PHI:          29.00 [deg]  
GRB_THETA:       119.00 [deg]  
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       260.55d {+17h 22m 11s}  -23.15d {-23d 09' 09"}
SUN_DIST:         38.82 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.71d {+23h 14m 51s}   +0.76d {+00d 45' 19"}
MOON_DIST:       106.51 [deg]  
MOON_ILLUM:      49 [%]        
GAL_COORDS:       23.35, 41.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.89, 31.28 [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 13 Dec 10 10:49:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     313930162
GRB_RA:          237.560d {+15h 50m 14s} (J2000),
                 237.684d {+15h 50m 44s} (current),
                 236.992d {+15h 47m 58s} (1950)
GRB_DEC:         +17.170d {+17d 10' 12"} (J2000),
                 +17.137d {+17d 08' 14"} (current),
                 +17.321d {+17d 19' 14"} (1950)
GRB_ERROR:       6.42 [deg radius, statistical only]
DATA_SIGNIF:     14.30 [sigma] 
DATA_INTERVAL:   4.096 [sec]   
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38960.80 SOD {10:49:20.80} UT
GRB_PHI:          36.00 [deg]  
GRB_THETA:       123.00 [deg]  
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       260.55d {+17h 22m 11s}  -23.15d {-23d 09' 09"}
SUN_DIST:         46.07 [deg]   Sun_angle= 1.5 [hr] (West of Sun)
MOON_POSTN:      348.71d {+23h 14m 51s}   +0.76d {+00d 45' 20"}
MOON_DIST:       109.82 [deg]  
MOON_ILLUM:      49 [%]        
GAL_COORDS:       28.94, 47.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      230.53, 36.27 [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 13 Dec 10 10:50:25 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger 
TRIGGER_NUM:    6106,   Sub_Num: 0
GRB_INTEN:      9.11 [sigma]
GRB_TIME:       38958.20 SOD {10:49:18.20} UT 
GRB_DATE:       15543 TJD;   347 DOY;   10/12/13
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=313930162).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2010-12/2010-12-13T10-49-18.0066-00796-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:59:12 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.286d {+16h 05m 09s} (J2000),
                 241.405d {+16h 05m 37s} (current),
                 240.744d {+16h 02m 59s} (1950)
GRB_DEC:         +21.915d {+21d 54' 53"} (J2000),
                 +21.885d {+21d 53' 08"} (current),
                 +22.050d {+22d 02' 59"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3902 [cnts]    Image_Peak=151 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       22198 [cnts]
BKG_TIME:        38945.53 SOD {10:49:05.53} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38963.07 SOD {10:49:23.07} UT
GRB_PHI:         -30.76 [deg]
GRB_THETA:        46.17 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.72 [sigma]
IMAGE_SIGNIF:    7.43 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0 -65  +0 
SUN_POSTN:       260.55d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.74 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.78d {+23h 15m 08s}   +0.79d {+00d 47' 13"}
MOON_DIST:       105.78 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.17, 45.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      233.30, 41.77 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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:        This trigger occurred at longitude,latitude = 11.85,-5.21 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:59:50 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.3139d {+16h 05m 15.33s} (J2000),
                 241.4327d {+16h 05m 43.84s} (current),
                 240.7716d {+16h 03m 05.19s} (1950)
GRB_DEC:         +21.8984d {+21d 53' 54.2"} (J2000),
                 +21.8692d {+21d 52' 09.1"} (current),
                 +22.0332d {+22d 01' 59.4"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       4.76e-09 [erg/cm2/sec]
GRB_SIGNIF:      11.87 [sigma]
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39068.62 SOD {10:51:08.62} UT,   105.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.20 261.56 243.31
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       260.55d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.72 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.79d {+23h 15m 09s}   +0.79d {+00d 47' 20"}
MOON_DIST:       105.76 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.16, 45.87 [deg] galactic lon,lat of the burst
ECL_COORDS:      233.34, 41.76 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.82 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:00:07 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.3139d {+16h 05m 15.3s} (J2000),
                 241.4327d {+16h 05m 43.8s} (current),
                 240.7716d {+16h 03m 05.1s} (1950)
GRB_DEC:         +21.8984d {+21d 53' 54.2"} (J2000),
                 +21.8692d {+21d 52' 09.1"} (current),
                 +22.0332d {+22d 01' 59.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       141 [cnts]
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39068.62 SOD {10:51:08.62} UT,   105.6 [sec] since BAT Trigger Time
CENTROID_X:      320.36,  raw= 320  [pixels]
CENTROID_Y:      357.12,  raw= 357  [pixels]
ROLL:            156.24 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   139.36
GRB_POS_XRT_Z:   42.58
IMAGE_URL:       sw00440285000msxps_rw.img
SUN_POSTN:       260.55d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.72 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.79d {+23h 15m 10s}   +0.79d {+00d 47' 24"}
MOON_DIST:       105.77 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.16, 45.87 [deg] galactic lon,lat of the burst
ECL_COORDS:      233.34, 41.76 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 10:59:59 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.3139d {+16h 05m 15.3s} (J2000),
                 241.4327d {+16h 05m 43.8s} (current),
                 240.7716d {+16h 03m 05.1s} (1950)
GRB_DEC:         +21.8984d {+21d 53' 54.2"} (J2000),
                 +21.8692d {+21d 52' 09.1"} (current),
                 +22.0332d {+22d 01' 59.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       141 [cnts]
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39068.62 SOD {10:51:08.62} UT,   105.6 [sec] since BAT Trigger Time
CENTROID_X:      320.36,  raw= 320  [pixels]
CENTROID_Y:      357.12,  raw= 357  [pixels]
ROLL:            156.24 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   139.36
GRB_POS_XRT_Z:   42.58
IMAGE_URL:       sw00440285000msxps_rw.img
SUN_POSTN:       260.55d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.72 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.79d {+23h 15m 09s}   +0.79d {+00d 47' 22"}
MOON_DIST:       105.77 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.16, 45.87 [deg] galactic lon,lat of the burst
ECL_COORDS:      233.34, 41.76 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:00:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.286d {+16h 05m 09s} (J2000),
                 241.405d {+16h 05m 37s} (current),
                 240.744d {+16h 02m 59s} (1950)
GRB_DEC:         +21.915d {+21d 54' 53"} (J2000),
                 +21.885d {+21d 53' 08"} (current),
                 +22.050d {+22d 02' 59"} (1950)
GRB_DATE:        15543 TJD;   347 DOY;   10/12/13
GRB_TIME:        38963.07 SOD {10:49:23.07} UT
TRIGGER_INDEX:   148
GRB_PHI:         -30.76 [deg]
GRB_THETA:        46.17 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.72 [sigma]
IMAGE_SIGNIF:    7.43 [sigma]
LC_URL:          sw00440285000msb.lc
SUN_POSTN:       260.56d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.74 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.80d {+23h 15m 11s}   +0.79d {+00d 47' 31"}
MOON_DIST:       105.79 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.17, 45.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      233.30, 41.77 [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:        This trigger occurred at longitude,latitude = 11.85,-5.21 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:00:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 07s} (J2000)
POINT_DEC:       +21.872d {+21d 52' 18"} (J2000)
POINT_ROLL:      156.235d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39077.56 SOD {10:51:17.56} UT,   114.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.662
N_STARS:         32
X_OFFSET:        176 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1135 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00440285000msufc0114.fits
SUN_POSTN:       260.56d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.80d {+23h 15m 11s}   +0.79d {+00d 47' 34"}
MOON_DIST:       105.80 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:01:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 07s} (J2000)
POINT_DEC:       +21.872d {+21d 52' 18"} (J2000)
POINT_ROLL:      156.235d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39077.56 SOD {10:51:17.56} UT,   114.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.662
N_STARS:         32
X_OFFSET:        176 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1135 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00440285000msufc0114.fits
SUN_POSTN:       260.56d {+17h 22m 13s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.80d {+23h 15m 12s}   +0.79d {+00d 47' 40"}
MOON_DIST:       105.81 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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:     Mon 13 Dec 10 11:02:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 07s} (J2000)
POINT_DEC:       +21.872d {+21d 52' 18"} (J2000)
ROLL:            156.235d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39077.56 SOD {10:51:17.56} UT,   114.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     313930284
X_OFFSET:        592 [pixels]
Y_OFFSET:        676 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       752
Y_GRB_POS:       836
BINNING_INDEX:   1
IM_URL:          sw00440285000msuni0121.fits
SUN_POSTN:       260.56d {+17h 22m 14s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.81d {+23h 15m 13s}   +0.80d {+00d 47' 47"}
MOON_DIST:       105.81 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:02:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 07s} (J2000)
POINT_DEC:       +21.872d {+21d 52' 18"} (J2000)
ROLL:            156.235d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39077.56 SOD {10:51:17.56} UT,   114.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     313930284
X_OFFSET:        592 [pixels]
Y_OFFSET:        676 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       752
Y_GRB_POS:       836
BINNING_INDEX:   1
IM_URL:          sw00440285000msuni0121.fits
SUN_POSTN:       260.56d {+17h 22m 14s}  -23.15d {-23d 09' 11"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.81d {+23h 15m 14s}   +0.80d {+00d 47' 51"}
MOON_DIST:       105.81 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:07:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 08s} (J2000)
POINT_DEC:       +21.873d {+21d 52' 22"} (J2000)
POINT_ROLL:      156.238d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39290.33 SOD {10:54:50.33} UT,   327.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.652
N_STARS:         71
X_OFFSET:        272 [pixels]
Y_OFFSET:        356 [pixels]
X_MAX:           1231 [pixels]
Y_MAX:           1315 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00440285000msufc0327.fits
SUN_POSTN:       260.56d {+17h 22m 14s}  -23.15d {-23d 09' 12"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.84d {+23h 15m 23s}   +0.81d {+00d 48' 52"}
MOON_DIST:       105.84 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:07:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 08s} (J2000)
POINT_DEC:       +21.873d {+21d 52' 22"} (J2000)
POINT_ROLL:      156.238d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39290.33 SOD {10:54:50.33} UT,   327.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.652
N_STARS:         71
X_OFFSET:        272 [pixels]
Y_OFFSET:        356 [pixels]
X_MAX:           1231 [pixels]
Y_MAX:           1315 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00440285000msufc0327.fits
SUN_POSTN:       260.56d {+17h 22m 15s}  -23.15d {-23d 09' 12"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.85d {+23h 15m 23s}   +0.82d {+00d 48' 55"}
MOON_DIST:       105.84 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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:     Mon 13 Dec 10 11:08:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 08s} (J2000)
POINT_DEC:       +21.873d {+21d 52' 22"} (J2000)
ROLL:            156.238d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39290.33 SOD {10:54:50.33} UT,   327.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     313930496
X_OFFSET:        592 [pixels]
Y_OFFSET:        676 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       752
Y_GRB_POS:       836
BINNING_INDEX:   1
IM_URL:          sw00440285000msuni0334.fits
SUN_POSTN:       260.56d {+17h 22m 15s}  -23.15d {-23d 09' 12"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.85d {+23h 15m 25s}   +0.82d {+00d 49' 06"}
MOON_DIST:       105.85 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:08:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     440285,   Seg_Num: 0
POINT_RA:        241.281d {+16h 05m 08s} (J2000)
POINT_DEC:       +21.873d {+21d 52' 22"} (J2000)
ROLL:            156.238d
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39290.33 SOD {10:54:50.33} UT,   327.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     313930496
X_OFFSET:        592 [pixels]
Y_OFFSET:        676 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       752
Y_GRB_POS:       836
BINNING_INDEX:   1
IM_URL:          sw00440285000msuni0334.fits
SUN_POSTN:       260.56d {+17h 22m 15s}  -23.15d {-23d 09' 12"}
SUN_DIST:         48.71 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      348.86d {+23h 15m 25s}   +0.82d {+00d 49' 10"}
MOON_DIST:       105.85 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.11, 45.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      233.31, 41.72 [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.

GCN Circular #11448
T. Sakamoto (NASA/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. Campana (INAF-OAB), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), R. L. C. Starling (U Leicester), G. Stratta (ASDC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 10:49:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 101213A (trigger=440285). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 241.286,+21.915 which is
```
   RA(J2000) = 16h 05m09s
   Dec(J2000) = +21d54'53"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-like structure with a duration of about 100 sec. The peak count rate was ~1700 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 10:51:08.6 UT, 105.6 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 241.3139, +21.8984 which is equivalent to:
```
   RA(J2000)  = 16h 05m 15.33s
   Dec(J2000) = +21d 53' 54.2"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 110 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 114 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 0.06.
Burst Advocate for this burst is T. Sakamoto (Taka.Sakamoto 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 13 Dec 10 11:33:42 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     440285,   Seg_Num: 0
GRB_RA:          241.3136d {+16h 05m 15.26s} (J2000),
                 241.4324d {+16h 05m 43.77s} (current),
                 240.7713d {+16h 03m 05.11s} (1950)
GRB_DEC:         +21.8971d {+21d 53' 49.5"} (J2000),
                 +21.8679d {+21d 52' 04.4"} (current),
                 +22.0319d {+22d 01' 54.8"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15543 TJD;   347 DOY;   10/12/13
IMG_START_TIME:  39352.00 SOD {10:55:52.00} UT,   388.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       260.58d {+17h 22m 19s}  -23.15d {-23d 09' 16"}
SUN_DIST:         48.73 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:      349.04d {+23h 16m 10s}   +0.90d {+00d 54' 10"}
MOON_DIST:       105.95 [deg]
MOON_ILLUM:      49 [%]
GAL_COORDS:       37.16, 45.87 [deg] galactic lon,lat of the burst
ECL_COORDS:      233.34, 41.75 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #11449
D. Malesani and A. de Ugarte Postigo (DARK/NBI), report:
We notice the presence of an object within the error circle of the X-ray afterglow of GRB 101213 (Sakamoto et al., GCN 11448; see also http://www.swift.ac.uk/sper/). The object is visible in the DSS as well in gri images of the SDSS. It is classified as a galaxy in the SDSS catalog. The coordinates are:
```
  
RA(J2000) = 16:05:15.20        
Dec(J2000) = 21:53:49.2        
  
```
Magnitudes from the SDSS are (AB):
```
  
g = 22.07 +- 0.09
r = 21.22 +- 0.07
i = 21.12 +- 0.12
  
```
Despite the bad visibility of this GRB right now, the field will be observable from the Northern hemisphere in a couple of weeks. Given the brightness of the potential host galaxy, and hence the likely low redshift, a search for an associated SN may be attempted (also to confirm the object as the GRB host).
GCN Circular #11450
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2148 s of XRT Photon Counting mode data and 3 UVOT images for GRB 101213A, 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 = 241.31370, +21.89715 which is equivalent to:
```
RA (J2000): 16h 05m 15.29s
Dec (J2000): +21d 53' 49.7"
```
with an uncertainty of 1.7 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 #11451
W. Landsman (NASA/Adnet) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 101213A 114 s after the BAT trigger (Sakamoto et al., GCN Circ. 11448). No optical afterglow consistent with the XRT position (Osborne et al., GCN Circ. 11450) is detected in the initial 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) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)      Mag

white_FC           114          264          147>21.0
u_FC               327          577          246>19.8
white              114         5066          286>21.4
v                 3919         4119          197>19.2
b                  583         4940          216>20.5
u                  327         4733          442>20.4
w1                4329         4529          197>20.3
m2                4124         4323          197>20.4
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11452
P.A. Evans (U. Leicester) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed 4.9 ks of XRT data for GRB 101213A (Sakamoto et al. GCN Circ. 11448), from 95 s to 16.9 ks after the BAT trigger. The data comprise 270 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 Osborne et al. (GCN. Circ 11450).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=2.33 (+/-0.14). At T+196 s the decay steepens to an alpha of 3.14 (+0.27, -0.18) before breaking again at T+407 s to a final decay with index alpha=0.90 (+0.04, -0.05).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.62 (+0.08, -0.07). The best-fitting absorption column is 5.73 (+0.30, -0.29) x 10^21 cm^-2, in excess of the Galactic value of 4.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.44 (+0.18, -0.17) and a best-fitting absorption column of 6.5 (+0.9, -0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.4 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.5 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 4.6 x 10^20 cm^-2
Excess significance: 13.5 sigma
Photon index:	     2.44 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 0.90, the count rate at T+24 hours will be 0.021 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.4 x 10^-13 (2.6 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00440285.
This circular is an official product of the Swift-XRT team.
GCN Circular #11453
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 101213A (trigger #440285) (Sakamoto, et al., GCN Circ. 11448). The BAT ground-calculated position is RA, Dec = 241.297, 21.905 deg which is
```
   RA(J2000)  =  16h 05m 11.3s 
   Dec(J2000) = +21d 54' 17.6" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 31%.
The mask-weighted light curve shows two overlapping peaks. The first peak is starting at ~T-5 sec and peaking at ~T+0. The second peak is peaking at ~T+15 sec, and roughly exponential decaying out to ~T+100 sec. T90 (15-350 keV) is 135 +- 38 sec (estimated error including systematics).
The time-averaged spectrum from T-3.1 to T+197.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.53 +- 0.09. The fluence in the 15-150 keV band is 5.0 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.26 sec in the 15-150 keV band is 2.2 +- 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/440285/BA/
GCN Circular #11454
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 10:49:20.80 UT on 13 December 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 101213A (trigger 313930162 / 101213451) which was also detected by the Swift/BAT (Sakamoto et al. 2010, GCN 11448). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 129 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve conists of two overlapping FRED like pulses with a duration (T90) of about 45 (+/-4) s (50-300 keV). The time-averaged spectrum from T0-1.536 s to T0+44.545 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 (+/-0.07) and the cutoff energy, parameterized as Epeak, is 315.0 (+46.7/-35.9) keV (CSTAT 740 for 365 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (1.40 +/- 0.01)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.944 s in the 10-1000 keV band is 4.67 (+/-0.32) ph/s/cm^2.
A Band function fits the spectrum equally well (CSTAT 739 for 365 d.o.f.) with Epeak= 309.7 (+48.9/-40.0) keV, alpha = -1.1 (+/-0.07) and beta = -2.35 (+0.29/-0.72).
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11456
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 101213A (Swift/BAT trigger #440285: Sakamoto, et al., GCN 11448; Cummings, et al., GCN 11453) triggered Konus-Wind at T0=3D38958.472s UT (10:49:18.472)
The burst light curve consists of two overlapping pulses with a total duration of ~50 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/GRB101213_T38958/
As observed by Konus-Wind, the burst had a fluence of (1.3 =B1 0.3)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0-0.512s, of (0.60 =B1 0.15)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+41.216 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -0.7 (-0.3, +0.4), the high energy photon index beta = -2.3 (-1.5, +0.3), the peak energy Ep = 198(-49, +92)keV, chi2 =3D 51/59 dof.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #11457
S. Campana (INAF-OAB), S. Covino (INAF-OAB), A. Cucchiara (UCB/LBNL/UCSC), P. A. Evans (U Leicester), D. Grupe (PSU), D. Malesani (DARK/NBI), T. Sakamoto (NASA/UMBC) and R. L. C. Starling (U Leicester):
Swift BAT triggered on the early activity of GRB 101213A (Sakamoto et al. 2010, GCN 11448). Swift XRT started observing 106 s after the trigger observing the main event. We selected the time interval between 112-154 s during which the hardness ratio (as judged from the Swift/XRT spectrum repository at http://www.swift.ac.uk/xrt_spectra/00440285/ ) and the power law photon index (as judged from the Swift/XRT burst analyser http://www.swift.ac.uk/burst_analyser/00440285/ ) are consistent with a constant. We bin the spectrum to 30 counts per energy bin and used the latest response matrices v012. The spectrum is in Windowed Timing mode (WT) and contains about 6,000 counts. We fit the WT spectrum with XSPEC using the model tbabs*ztbabs*(cutoff), (the cutoff power-law model provides much better results in terms of column density evaluation with respect to a simple power-law model when small spectral variations are present). We assume a Galactic column density of 4.6x10^20 cm^-2 (Kalberla et al. 2005, A&A 440 775). In the intrinsic column density vs. redshift plane there is just one deep minimum hinting for a redshift z=2.9^+0.2_-0.8 (90% confidence level) and an intrinsic column density N_H(z)=(1.5^+0.7_-0.3)x10^23 cm^-2. The X-ray spectrum is soft with Gamma~2.5 at the end of the prompt phase and no signs of spectral curvature (cut-off energy > 30 keV).
The absorption pattern towards GRB 101213A is complicated by the galaxy reported by Malesani & de Ugarte Postigo (2010, GCN 11449). We tried to fit an extra absorption component fixed either to z=0.1 or z=0.5 (i.e. the two possible photometric redshifts of the putative host galaxy observed in the SDSS, z=0.10+/-0.07 and z=0.47+/-0.22, respectively), with basically no effects on the overall results. This low-redshift component is not able alone to account for the observed absorption pattern.
Looking at the burst analyser page (see above), we also note that there is a mismatch in the BAT and XRT power law photon indices during the short interval during which there are contemporanous data. Motivated by this we fit the XRT spectrum with a broken power law. The fit is as good as the power law fit. In this case we obtain a very soft low-energy photon index of Gamma1=3.1+/-0.2 and a high-energy photon index Gamma2=2.0+/-0.2 (consistent with the BAT extrapolation). The transition energy is around 3 keV. In this case, the redshift is z=0.3^+0.4_-0.1 and the intrinsic column density is (1.1^+0.3_-0.2)x10^22 cm^-2. In this case the redshift determination is consistent with the putative host galaxy but the resulting X-ray spectrum is peculiar, with a spectral variation Delta Gamma~1 and a spectrum that remains (almost) constant for ~150 s, becoming even softer later on. Alternatively, the X-ray spectrum could be fit (equally well) with a black body plus a power law component. In this case the redshift is z=0.3^+0.1_-0.2 and the intrinsic column density NH=(1.1^+0.3_-0.2)x10^22 cm^-2. The power law is very soft with Gamma~3.3 and the black body (rest-frame) temperature is high kT=2.3^+1.3_-0.5 keV. The black body radius is ~2x10^11 cm. We note that the black body temperature is much higher than what is observed in, e.g., GRB 060218 (kT~0.2 keV, Campana et al. 2006, Nat 442 1008) or GRB 100316D (kT~0.1 keV, Starling et al. 2010, MNRAS in press).
We can conclude that in all cases, the X-ray afterglow flux is heavily absorbed and this is in line with the non-detection with UVOT. Given the presence of a candidate host galaxy within the XRT refined error circle (Malesani & de Ugarte Postigo 2010), we cannot rule out a low redshift solution, but in this case a peculiar X-ray spectrum is observed.
GCN Circular #11458
Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), N. Ohmori, A. Daikyuji, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA), K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U.), Y. Terada, M. Tashiro, S. Hong, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.), P. Tsai, Y. Urata (NCU), N. Vasquez (Tokyo Tech.), Y. E. Nakagawa, M. Serino, T. Tamagawa (RIKEN), K. Nakazawa, K. Makishima (Univ. of Tokyo), on behalf of the Suzaku WAM team, report:
The multi-spiked long GRB 101213A (Swift/BAT trigger #440285, GCN 11448; Sakamoto et al.,) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 10:49:19.352 UT (=T0).
The observed light curve shows a multi-peaked structure starting at T0-1s, ending at T0+50s with a duration (T90) of about 32 seconds. The fluence in 100 - 1000 keV was 7.47 (+1.14/-1.06) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+2s was 0.84 (+0.10/-0.09) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-1s to T0+50s is well fitted by a single power-law with a photon index of 2.08 (+0.24/-0.21) (chi^2/d.o.f = 19.9/14).
Due to the brightness of this burst, a 3% systematic error was added for low energy channels. All the quoted errors are at statistical 90% confidence level.
The light curves for this burst will be available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #11544
R. Chornock and E. Berger (Harvard) report:
We obtained a 1200s spectrum of the SDSS galaxy within the XRT error circle (Malesani & de Ugarte Postigo, GCN 11449) of GRB 101213A (Sakamoto et al., GCN 11448; Gruber et al., GCN 11454; Golenetskii et al., GCN 11456; Hanabata et al., GCN 11458) using GMOS on Gemini-North on Jan. 7.65 UT to cover the spectral range 3900-8100 Angstroms. The galaxy has a blue continuum and exhibits emission lines of H-beta and [O III] at a redshift of z=0.414.

Back to JG's homepage

Jochen Greiner, last update: 13-Dec-2010 [Disclaimer]