Gamma-ray Burst 061102

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:01:37 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     236430,   Seg_Num: 0
GRB_RA:          148.405d {+09h 53m 37s} (J2000),
                 148.487d {+09h 53m 57s} (current),
                 147.810d {+09h 51m 14s} (1950)
GRB_DEC:         -17.066d {-17d 03' 58"} (J2000),
                 -17.099d {-17d 05' 54"} (current),
                 -16.830d {-16d 49' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       48864 [cnts]    Image_Peak=567 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   478     E_range: 25-100 keV
BKG_INTEN:       243377 [cnts]
BKG_TIME:        3534.45 SOD {00:58:54.45} UT
BKG_DUR:         64 [sec]
GRB_DATE:        14041 TJD;   306 DOY;   06/11/02
GRB_TIME:        3631.22 SOD {01:00:31.22} UT
GRB_PHI:         -160.40 [deg]
GRB_THETA:         5.76 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     11.04 [sigma]
IMAGE_SIGNIF:    6.75 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  +1  +0  +0 -41  +1 
SUN_POSTN:       217.07d {+14h 28m 16s}  -14.64d {-14d 38' 39"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.88d {+23h 27m 30s}   -3.68d {-03d 40' 50"}
MOON_DIST:       148.93 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.46, 28.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      157.17,-27.94 [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 = 167.39,-20.01 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:02:40 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     236430,   Seg_Num: 0
GRB_RA:          148.4074d {+09h 53m 37.7s} (J2000),
                 148.4889d {+09h 53m 57.3s} (current),
                 147.8116d {+09h 51m 14.7s} (1950)
GRB_DEC:         -17.0245d {-17d 01' 28.1"} (J2000),
                 -17.0569d {-17d 03' 24.9"} (current),
                 -16.7881d {-16d 47' 17.2"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.24 [sigma]
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3731.35 SOD {01:02:11.35} UT,   100.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.60 237.19 261.29 243.27
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       217.07d {+14h 28m 16s}  -14.64d {-14d 38' 40"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.89d {+23h 27m 32s}   -3.68d {-03d 40' 32"}
MOON_DIST:       148.96 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.43, 28.29 [deg] galactic lon,lat of the burst
ECL_COORDS:      157.16,-27.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:02:48 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     236430,   Seg_Num: 0
GRB_RA:          148.4074d {+09h 53m 37.7s} (J2000),
                 148.4889d {+09h 53m 57.3s} (current),
                 147.8116d {+09h 51m 14.7s} (1950)
GRB_DEC:         -17.0245d {-17d 01' 28.1"} (J2000),
                 -17.0569d {-17d 03' 24.9"} (current),
                 -16.7881d {-16d 47' 17.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       39 [cnts]
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3731.35 SOD {01:02:11.35} UT,   100.1 [sec] since BAT Trigger Time
CENTROID_X:      311.74,  raw= 312  [pixels]
CENTROID_Y:      362.14,  raw= 362  [pixels]
ROLL:            98.72 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   149.33
GRB_POS_XRT_Z:   24.62
IMAGE_URL:       sw00236430000msxps_rw.img
SUN_POSTN:       217.07d {+14h 28m 16s}  -14.64d {-14d 38' 40"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.89d {+23h 27m 33s}   -3.68d {-03d 40' 29"}
MOON_DIST:       148.96 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.43, 28.29 [deg] galactic lon,lat of the burst
ECL_COORDS:      157.16,-27.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:02:41 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     236430,   Seg_Num: 0
GRB_RA:          148.4074d {+09h 53m 37.7s} (J2000),
                 148.4889d {+09h 53m 57.3s} (current),
                 147.8116d {+09h 51m 14.7s} (1950)
GRB_DEC:         -17.0245d {-17d 01' 28.1"} (J2000),
                 -17.0569d {-17d 03' 24.9"} (current),
                 -16.7881d {-16d 47' 17.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       39 [cnts]
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3731.35 SOD {01:02:11.35} UT,   100.1 [sec] since BAT Trigger Time
CENTROID_X:      311.74,  raw= 312  [pixels]
CENTROID_Y:      362.14,  raw= 362  [pixels]
ROLL:            98.72 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   149.33
GRB_POS_XRT_Z:   24.62
IMAGE_URL:       sw00236430000msxps_rw.img
SUN_POSTN:       217.07d {+14h 28m 16s}  -14.64d {-14d 38' 40"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.89d {+23h 27m 32s}   -3.68d {-03d 40' 31"}
MOON_DIST:       148.96 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.43, 28.29 [deg] galactic lon,lat of the burst
ECL_COORDS:      157.16,-27.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:04:17 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     236430,   Seg_Num: 0
GRB_RA:          148.405d {+09h 53m 37s} (J2000),
                 148.487d {+09h 53m 57s} (current),
                 147.810d {+09h 51m 14s} (1950)
GRB_DEC:         -17.066d {-17d 03' 58"} (J2000),
                 -17.099d {-17d 05' 54"} (current),
                 -16.830d {-16d 49' 47"} (1950)
GRB_DATE:        14041 TJD;   306 DOY;   06/11/02
GRB_TIME:        3631.22 SOD {01:00:31.22} UT
TRIGGER_INDEX:   478
GRB_PHI:         -160.40 [deg]
GRB_THETA:         5.76 [deg]
DELTA_TIME:      -75.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     11.04 [sigma]
IMAGE_SIGNIF:    6.75 [sigma]
LC_URL:          sw00236430000msb.lc
SUN_POSTN:       217.07d {+14h 28m 16s}  -14.64d {-14d 38' 41"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.90d {+23h 27m 36s}   -3.67d {-03d 40' 03"}
MOON_DIST:       148.93 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.46, 28.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      157.17,-27.94 [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 = 167.39,-20.01 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:07:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        148.408d {+09h 53m 38s} (J2000)
POINT_DEC:       -17.067d {-17d 03' 59"} (J2000)
ROLL:            98.716d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3741.48 SOD {01:02:21.48} UT,   110.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     184122143
X_OFFSET:        607 [pixels]
Y_OFFSET:        624 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       767
Y_GRB_POS:       784
BINNING_INDEX:   1
IM_URL:          sw00236430000msuni0110.fits
SUN_POSTN:       217.07d {+14h 28m 17s}  -14.65d {-14d 38' 44"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.93d {+23h 27m 44s}   -3.65d {-03d 39' 01"}
MOON_DIST:       148.92 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.46, 28.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      157.17,-27.93 [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:     Thu 02 Nov 06 01:08:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        148.408d {+09h 53m 38s} (J2000)
POINT_DEC:       -17.067d {-17d 03' 59"} (J2000)
ROLL:            98.716d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3741.48 SOD {01:02:21.48} UT,   110.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     184122143
X_OFFSET:        607 [pixels]
Y_OFFSET:        624 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       767
Y_GRB_POS:       784
BINNING_INDEX:   1
IM_URL:          sw00236430000msuni0110.fits
SUN_POSTN:       217.07d {+14h 28m 17s}  -14.65d {-14d 38' 44"}
SUN_DIST:         65.67 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      351.93d {+23h 27m 44s}   -3.65d {-03d 38' 56"}
MOON_DIST:       148.91 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      253.46, 28.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      157.17,-27.93 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:11:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        162.922d {+10h 51m 41s} (J2000)
POINT_DEC:       -38.732d {-38d 43' 53"} (J2000)
POINT_ROLL:      74.623d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3846.75 SOD {01:04:06.75} UT,   215.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.851
N_STARS:         18
X_OFFSET:        287 [pixels]
Y_OFFSET:        304 [pixels]
X_MAX:           1246 [pixels]
Y_MAX:           1263 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00236430000msufc0215.fits
SUN_POSTN:       217.07d {+14h 28m 17s}  -14.65d {-14d 38' 46"}
SUN_DIST:         53.06 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:      351.96d {+23h 27m 51s}   -3.63d {-03d 38' 04"}
MOON_DIST:       136.80 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      278.70, 18.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      182.97,-41.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:11:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        162.922d {+10h 51m 41s} (J2000)
POINT_DEC:       -38.732d {-38d 43' 53"} (J2000)
POINT_ROLL:      74.623d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3846.75 SOD {01:04:06.75} UT,   215.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.851
N_STARS:         18
X_OFFSET:        287 [pixels]
Y_OFFSET:        304 [pixels]
X_MAX:           1246 [pixels]
Y_MAX:           1263 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00236430000msufc0215.fits
SUN_POSTN:       217.07d {+14h 28m 17s}  -14.65d {-14d 38' 47"}
SUN_DIST:         53.06 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:      351.97d {+23h 27m 52s}   -3.63d {-03d 37' 56"}
MOON_DIST:       136.80 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      278.70, 18.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      182.97,-41.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 06 01:12:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        162.922d {+10h 51m 41s} (J2000)
POINT_DEC:       -38.732d {-38d 43' 53"} (J2000)
ROLL:            74.623d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3846.75 SOD {01:04:06.75} UT,   215.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     184122248
X_OFFSET:        607 [pixels]
Y_OFFSET:        624 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       767
Y_GRB_POS:       784
BINNING_INDEX:   1
IM_URL:          sw00236430000msuni0215.fits
SUN_POSTN:       217.07d {+14h 28m 18s}  -14.65d {-14d 38' 48"}
SUN_DIST:         53.06 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:      351.97d {+23h 27m 54s}   -3.63d {-03d 37' 38"}
MOON_DIST:       136.80 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      278.70, 18.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      182.97,-41.70 [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:     Thu 02 Nov 06 01:12:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     236430,   Seg_Num: 0
POINT_RA:        162.922d {+10h 51m 41s} (J2000)
POINT_DEC:       -38.732d {-38d 43' 53"} (J2000)
ROLL:            74.623d
IMG_START_DATE:  14041 TJD;   306 DOY;   06/11/02
IMG_START_TIME:  3846.75 SOD {01:04:06.75} UT,   215.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     184122248
X_OFFSET:        607 [pixels]
Y_OFFSET:        624 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       767
Y_GRB_POS:       784
BINNING_INDEX:   1
IM_URL:          sw00236430000msuni0215.fits
SUN_POSTN:       217.07d {+14h 28m 18s}  -14.65d {-14d 38' 48"}
SUN_DIST:         53.06 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:      351.98d {+23h 27m 55s}   -3.63d {-03d 37' 33"}
MOON_DIST:       136.80 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      278.70, 18.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      182.97,-41.70 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #5776
S. T. Holland (GSFC/USRA), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), K. M. McLean (LANL/UTD), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), M. Stamatikos (NASA/ORAU) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 01:00:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061102 (trigger=236430). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 148.405, -17.066 {09h 53m 37s, -17d 03' 58"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a weak pulse ~15 sec long. The peak count rate was ~500 counts/sec (15-350 keV) at ~5 sec after the trigger.
The XRT began observing the field at 01:02:11 UT, 100 seconds after the BAT trigger. XRT found an uncatalogued fading X-ray source located at RA(J2000) = 09h 53m 37.7s, Dec(J2000) = -17d 01' 28.1", with an estimated uncertainty of 6.1 arcseconds (90% confidence radius). This location is 150 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 6.0e-10 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 110 seconds after the BAT trigger. No 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 3-sigma upper limit is approximately 18.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04.
GCN Circular #5777
GRB 061102, Swift-BAT refined analysis
J. Tueller (GSFC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S.T. Holland (GSFC/USRA), 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) on behalf of the Swift-BAT team:
Using the data set from T-120 to T+182 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061102 (trigger #236430) (Holland, et al., GCN Circ. 5776). The BAT ground-calculated position is RA,Dec = 148.393, -17.000 deg {9h 53m 34.2s, -17d 0' 0.8"} (J2000) +- 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted lightcurve shows a FRED starting at T+0 and ending about T+50 sec. T90 (15-350 keV) is 17.6 +- 1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.0 to T+18.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.45 +- 0.33. The fluence in the 15-150 keV band is 1.9 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.37 sec in the 15-150 keV band is 0.2 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5783
R. L. C. Starling, K. L. Page (U Leicester) and S. T. Holland (GSFC/USRA) report on behalf of the Swift XRT team:
We have analysed the first 3 orbits of Swift XRT data obtained for GRB 061102 (trigger 236430, GCN 5776 Holland et al.). The data consist of 208 s of WT mode data beginning at 112s since BAT trigger and 2560s of subsequent PC mode data.
Using the PC mode data we obtain a refined position of:
```
RA(J2000)  =  09 53 37.64
Dec(J2000) = -17 01 26.5
```
with an estimated uncertainty of 4.9 arcsec (90% containment) taking into account the new TELDEF files. This location is 1.8 arcsec from the initial XRT position (GCN Circ. 5776) and 98.7 arcsec from the ground-calculated BAT position (GCN Circ. 5777; Tueller et al.)
The lightcurve shows a steep decay over the first 400s with a slope of alpha = 4.0+/-0.1. At ~400s the lightcurve breaks to a slope of alpha~1.
The first orbit WT-mode spectrum can be well fitted with an absorbed power law with index Gamma = 3.6+/-0.2. The total column density required is 1.6E21 cm^-2 which exceeds the Galactic value of 5.0E20 cm^-2 (Dickey & Lockman 1990). The total flux in the 0.3-10 keV band is 1.2E-10 erg cm^-2 s^-1. All errors are quoted at the 90% confidence limit.
From these data we predict a count rate of 3.3E-4 counts s^-1, corresponding to a flux of approximately 8E-15 erg cm^-2 s^-1 at T+24h.
This circular is an official product of the Swift-XRT team.
GCN Circular #5784
GRB 061102: Swift/UVOT Magnitude Upper Limits
S. T. Holland (NASA/GSFC & USRA) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 061102 at 01:02:02 on 2006-11-02, 92 s after the BAT trigger (Holland et al., GCN Circ. 5776). No optical afterglow was detected in any of the individual UVOT exposures, or in the coadded exposures, down to the following 3-sigma limiting magnitudes. The start and stop times are relative to the BAT trigger.
```
Filter     Start   Stop   Exposure    3-sigma
             (s)     (s)      (s)     Upper Limit

Finding Charts
  White       112    209       97        19.9
    V         216    275       59        18.3

Coadded Exposures
    V         216  10154     1141        20.5
    B        4078  16849     1278        21.6
    U        3873  15938     1278        21.3
   UVW1      3669  11845     1160        21.3
   UVM2      3464  11059     1279        21.7
   UVW2      4488   6061      336        20.9
  White       112  17629     1247        21.5
```
The values quoted above are not corrected for the expected Galactic extinction of E_{B-V} = 0.04 mag (Schlegel et al. 1998).
GCN Report 12.1
GCN_Report 12.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_12_1.pdf by S.T.Holland at NASA/GSFC titled: "Swift Observations of GRB 061102"
GCN Report 12.2
GCN_Report 12.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_12_2.pdf by S.T.Holland at GSFC/USRA titled: "Updated Swift Observations of GRB 061102"

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Jochen Greiner, last update: 28-Nov-2006 [Disclaimer]