Gamma-ray Burst 060923B

(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 23 Sep 06 11:38:44 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.201d {+15h 52m 48s} (J2000),
                 238.307d {+15h 53m 14s} (current),
                 237.420d {+15h 49m 41s} (1950)
GRB_DEC:         -30.907d {-30d 54' 25"} (J2000),
                 -30.927d {-30d 55' 36"} (current),
                 -30.759d {-30d 45' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       21857 [cnts]    Image_Peak=464 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   297     E_range: 15-50 keV
BKG_INTEN:       196567 [cnts]
BKG_TIME:        41830.53 SOD {11:37:10.53} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14001 TJD;   266 DOY;   06/09/23
GRB_TIME:        41886.21 SOD {11:38:06.21} UT
GRB_PHI:         -156.89 [deg]
GRB_THETA:        46.07 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    9.40 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  +0  +0  +0 -45  +1 
SUN_POSTN:       180.28d {+12h 01m 08s}   -0.12d {-00d 07' 20"}
SUN_DIST:         62.91 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.75d {+12h 38m 59s}   -5.74d {-05d 44' 27"}
MOON_DIST:        51.95 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.63,-10.44 [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:        This trigger occurred at longitude,latitude = 107.43,19.60 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:40:35 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.2004d {+15h 52m 48.0s} (J2000),
                 238.3057d {+15h 53m 13.3s} (current),
                 237.4192d {+15h 49m 40.6s} (1950)
GRB_DEC:         -30.9127d {-30d 54' 45.7"} (J2000),
                 -30.9324d {-30d 55' 56.6"} (current),
                 -30.7644d {-30d 45' 51.7"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       41 [cnts]
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42000.72 SOD {11:40:00.72} UT,   114.5 [sec] since BAT Trigger Time
CENTROID_X:      323.51,  raw= 324  [pixels]
CENTROID_Y:      325.68,  raw= 326  [pixels]
ROLL:            287.74 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   63.36
GRB_POS_XRT_Z:   52.36
IMAGE_URL:       sw00230702000msxps_rw.img
SUN_POSTN:       180.28d {+12h 01m 08s}   -0.12d {-00d 07' 22"}
SUN_DIST:         62.91 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.76d {+12h 39m 02s}   -5.75d {-05d 44' 53"}
MOON_DIST:        51.94 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.74, 17.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.63,-10.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:40:35 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.2004d {+15h 52m 48.0s} (J2000),
                 238.3057d {+15h 53m 13.3s} (current),
                 237.4192d {+15h 49m 40.6s} (1950)
GRB_DEC:         -30.9127d {-30d 54' 45.7"} (J2000),
                 -30.9324d {-30d 55' 56.6"} (current),
                 -30.7644d {-30d 45' 51.7"} (1950)
GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.12e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.40 [sigma]
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42000.72 SOD {11:40:00.72} UT,   114.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.19 261.32 243.30
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       180.28d {+12h 01m 08s}   -0.12d {-00d 07' 22"}
SUN_DIST:         62.91 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.76d {+12h 39m 02s}   -5.75d {-05d 44' 53"}
MOON_DIST:        51.94 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.74, 17.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.63,-10.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:40:38 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.2004d {+15h 52m 48.0s} (J2000),
                 238.3057d {+15h 53m 13.3s} (current),
                 237.4192d {+15h 49m 40.6s} (1950)
GRB_DEC:         -30.9127d {-30d 54' 45.7"} (J2000),
                 -30.9324d {-30d 55' 56.6"} (current),
                 -30.7644d {-30d 45' 51.7"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       41 [cnts]
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42000.72 SOD {11:40:00.72} UT,   114.5 [sec] since BAT Trigger Time
CENTROID_X:      323.51,  raw= 324  [pixels]
CENTROID_Y:      325.68,  raw= 326  [pixels]
ROLL:            287.74 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   63.36
GRB_POS_XRT_Z:   52.36
IMAGE_URL:       sw00230702000msxps_rw.img
SUN_POSTN:       180.28d {+12h 01m 08s}   -0.12d {-00d 07' 22"}
SUN_DIST:         62.91 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.76d {+12h 39m 02s}   -5.75d {-05d 44' 54"}
MOON_DIST:        51.94 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.74, 17.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.63,-10.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:41:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.201d {+15h 52m 48s} (J2000),
                 238.307d {+15h 53m 14s} (current),
                 237.420d {+15h 49m 41s} (1950)
GRB_DEC:         -30.907d {-30d 54' 25"} (J2000),
                 -30.927d {-30d 55' 36"} (current),
                 -30.759d {-30d 45' 31"} (1950)
GRB_DATE:        14001 TJD;   266 DOY;   06/09/23
GRB_TIME:        41886.21 SOD {11:38:06.21} UT
TRIGGER_INDEX:   297
GRB_PHI:         -156.89 [deg]
GRB_THETA:        46.07 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    9.40 [sigma]
LC_URL:          sw00230702000msb.lc
SUN_POSTN:       180.28d {+12h 01m 08s}   -0.12d {-00d 07' 23"}
SUN_DIST:         62.91 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.77d {+12h 39m 05s}   -5.75d {-05d 45' 11"}
MOON_DIST:        51.93 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.63,-10.44 [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 = 107.43,19.60 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:43:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.891d {-30d 53' 26"} (J2000)
POINT_ROLL:      287.734d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42007.11 SOD {11:40:07.11} UT,   120.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.976
N_STARS:         190
X_OFFSET:        336 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00230702000msufc0120.fits
SUN_POSTN:       180.29d {+12h 01m 08s}   -0.12d {-00d 07' 24"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.78d {+12h 39m 07s}   -5.76d {-05d 45' 31"}
MOON_DIST:        51.90 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:43:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.891d {-30d 53' 26"} (J2000)
POINT_ROLL:      287.734d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42007.11 SOD {11:40:07.11} UT,   120.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.976
N_STARS:         190
X_OFFSET:        336 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00230702000msufc0120.fits
SUN_POSTN:       180.29d {+12h 01m 09s}   -0.12d {-00d 07' 25"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.78d {+12h 39m 08s}   -5.76d {-05d 45' 38"}
MOON_DIST:        51.90 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.43 [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 23 Sep 06 11:45:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.891d {-30d 53' 26"} (J2000)
ROLL:            287.734d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42007.11 SOD {11:40:07.11} UT,   120.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     180704408
X_OFFSET:        635 [pixels]
Y_OFFSET:        800 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       795
Y_GRB_POS:       960
BINNING_INDEX:   1
IM_URL:          sw00230702000msuni0120.fits
SUN_POSTN:       180.29d {+12h 01m 09s}   -0.12d {-00d 07' 26"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.79d {+12h 39m 11s}   -5.77d {-05d 45' 58"}
MOON_DIST:        51.89 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.43 [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:     Sat 23 Sep 06 11:45:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.891d {-30d 53' 26"} (J2000)
ROLL:            287.734d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42007.11 SOD {11:40:07.11} UT,   120.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     180704408
X_OFFSET:        635 [pixels]
Y_OFFSET:        800 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       795
Y_GRB_POS:       960
BINNING_INDEX:   1
IM_URL:          sw00230702000msuni0120.fits
SUN_POSTN:       180.29d {+12h 01m 09s}   -0.12d {-00d 07' 26"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.80d {+12h 39m 11s}   -5.77d {-05d 46' 01"}
MOON_DIST:        51.89 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.43 [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:     Sat 23 Sep 06 11:49:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.890d {-30d 53' 21"} (J2000)
POINT_ROLL:      287.733d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42112.38 SOD {11:41:52.38} UT,   226.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.766
N_STARS:         188
X_OFFSET:        315 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1274 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00230702000msufc0226.fits
SUN_POSTN:       180.29d {+12h 01m 09s}   -0.13d {-00d 07' 30"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.83d {+12h 39m 18s}   -5.78d {-05d 47' 00"}
MOON_DIST:        51.85 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 23 Sep 06 11:50:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.890d {-30d 53' 21"} (J2000)
POINT_ROLL:      287.733d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42112.38 SOD {11:41:52.38} UT,   226.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.766
N_STARS:         188
X_OFFSET:        315 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1274 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00230702000msufc0226.fits
SUN_POSTN:       180.29d {+12h 01m 09s}   -0.13d {-00d 07' 31"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.83d {+12h 39m 19s}   -5.79d {-05d 47' 06"}
MOON_DIST:        51.85 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.42 [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 23 Sep 06 11:50:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.890d {-30d 53' 21"} (J2000)
ROLL:            287.733d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42112.38 SOD {11:41:52.38} UT,   226.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     180704513
X_OFFSET:        635 [pixels]
Y_OFFSET:        800 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       795
Y_GRB_POS:       960
BINNING_INDEX:   1
IM_URL:          sw00230702000msuni0226.fits
SUN_POSTN:       180.29d {+12h 01m 10s}   -0.13d {-00d 07' 32"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.84d {+12h 39m 21s}   -5.79d {-05d 47' 18"}
MOON_DIST:        51.84 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.42 [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:     Sat 23 Sep 06 11:51:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     230702,   Seg_Num: 0
POINT_RA:        238.191d {+15h 52m 46s} (J2000)
POINT_DEC:       -30.890d {-30d 53' 21"} (J2000)
ROLL:            287.733d
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42112.38 SOD {11:41:52.38} UT,   226.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     180704513
X_OFFSET:        635 [pixels]
Y_OFFSET:        800 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       795
Y_GRB_POS:       960
BINNING_INDEX:   1
IM_URL:          sw00230702000msuni0226.fits
SUN_POSTN:       180.29d {+12h 01m 10s}   -0.13d {-00d 07' 32"}
SUN_DIST:         62.89 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.84d {+12h 39m 21s}   -5.79d {-05d 47' 21"}
MOON_DIST:        51.84 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      242.62,-10.42 [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:     Sat 23 Sep 06 11:54:10 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     230702,   Seg_Num: 0
GRB_RA:          238.1956d {+15h 52m 46.9s} (J2000),
                 238.3009d {+15h 53m 12.2s} (current),
                 237.4145d {+15h 49m 39.4s} (1950)
GRB_DEC:         -30.9036d {-30d 54' 12.9"} (J2000),
                 -30.9233d {-30d 55' 23.9"} (current),
                 -30.7553d {-30d 45' 18.9"} (1950)
GRB_ERROR:       6.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.12e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.40 [sigma]
IMG_START_DATE:  14001 TJD;   266 DOY;   06/09/23
IMG_START_TIME:  42000.72 SOD {11:40:00.72} UT,   114.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       180.29d {+12h 01m 10s}   -0.13d {-00d 07' 35"}
SUN_DIST:         62.90 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      189.86d {+12h 39m 26s}   -5.80d {-05d 48' 04"}
MOON_DIST:        51.82 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      342.75, 17.61 [deg] galactic lon,lat of the burst
ECL_COORDS:      242.63,-10.44 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.   
COMMENTS:        PREVIOUS POSITION WAS INCORRECT (COSMIC RAY)

GCN Circular #5590
M. Stamatikos (NASA/ORAU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), M. Capalbi (ASDC), M.L. Conciatore (ASDC), N. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), S. T. Holland (GSFC/USRA), J. A. Kennea (PSU), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), M. Perri (ASDC), T. Sakamoto (NASA/ORAU), D. E. Vanden Berk (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 11:38:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060923B (trigger=230702). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 238.201, -30.907 {15h 52m 48s, -30d 54' 25"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 11:40:00 UT, 114 seconds after the BAT trigger. XRT centroided on a cosmic ray on-board, so the position sent out in our first, automated XRT Position Notice is incorrect. From preliminary ground analysis of photon-counting mode data, XRT did find an uncatalogued X-ray source located at RA(J2000) = 15h 52m 46.83s, Dec(J2000) = -30d 54' 12.6", with an estimated uncertainty of 6.5 arcseconds (90% confidence radius). This position was sent out via BACODINE in a second XRT Position Notice with the correct position. This location is 21 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 2.4e-11 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of nominal 200 seconds with the White (160-650 nm) filter starting 122 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. 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. The overlap of the sub-image and the XRT error circle is 100%. No source is seen in the XRT error circle to a magnitude of approximately 18.5. No correction has been made for the expected extinction corresponding to E(B-V) of 0.15.
GCN Circular #5595
L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-240 to T+754 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060923B (trigger #230702) (Stamitikos, et al., GCN Circ. 5590). The BAT ground-calculated position is RA,Dec = 238.193, -30.907 deg {15h 52m 46.3s, -30d 54' 25.8"} (J2000) +- 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 36%.
The mask-weighted lightcurve has a single peak starting at T-1 sec and ending at T+10 sec. T90 (15-350 keV) is 8.8 +- 0.1 sec (estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+9.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.53 +- 0.25. The fluence in the 15-150 keV band is 4.8 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+4.93 sec in the 15-150 keV band is 1.5 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5602
M. Capalbi, M. Perri , M.L. Conciatore (ASDC), D.N. Burrows (PSU) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift XRT team:
We have analysed the first 2 orbits of XRT data from GRB 060923B (Stamatikos et al., GCN Circ. 5590) with a total exposure of 2.1ks in photon counting mode. The refined position is:
```
RA(J2000)  =  15h 52m 46.83s,
Dec(J2000) = -30d 54m 11.9s
```
with an uncertainty of 6 arcsec (90% containment). This position is 0.7 arcsec from the one calculated from early downlinked data (Stamatikos et al., GCN Circ. 5590).
The 0.3-10.0 keV X-ray light curve can be fit with a single power-law with a slope of -0.7+/-0.1.
A power-law fit to the X-ray spectrum from T + 125s to T + 365s gives a photon index of 1.7+/-0.5, fixing the hydrogen column density to the galactic value in the direction of the burst (8.8e20cm**-2). The 0.3-10.0 keV observed flux is 8.5e-12 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 8.9e-12 ergs cm**-2 s**-1.
If the burst continues decaying at the current rate we estimate an XRT count rate of 0.014 counts/s at T + 24hr, which corresponds to an observed 0.3-10.keV flux of 5.6e-13 ergs cm**-2 s**-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5603
S. Holland and A. Cucchiara report on behalf of the Swift/UVOT team:
The Swift UVOT began observing GRB 060923B (trigger #230702), M. Stamatikos et al., GCN Circ. 5590) 122 seconds after the BAT trigger. No optical afterglow is detected in the XRT refined error circle (M. Capalbi et al., GCN Circ.5602).
The 3-sigma limiting magnitudes for the finding chart and the coadded images for the UVOT filters are listed below:
Finding chart:
```
Filter        T_range (s)    Exposure (s)    3sigma UL
White         122-220         98              19.42
White         5163-5360       197             19.79

V             225-387         162             18.52

Coadded images:

Filter        T_range (s)    Exposure (s)    3sigma UL
V             5572-5768       196             18.61
B             4959-5156       197             19.61
U             4754-4950       197             19.28
W1            4550-6170       386             19.45
M2            4345-5974       394             19.70
W2            5368-5565       197             19.92
```
T_range is calculated from the time of the burst. No correction has been made for the Galactic reddening of E(B-V) = 0.15 mag (Schlegel et al. 1998) along the line of sight to the burst.
arXiv:1505.06743 X-shooter redshift: 1.5094

Back to JG's homepage

Jochen Greiner, last update: 25-Jun-2015 [Disclaimer]