Gamma-ray Burst 171102B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:21:24 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     785510,   Seg_Num: 0
GRB_RA:          288.103d {+19h 12m 25s} (J2000),
                 288.293d {+19h 13m 10s} (current),
                 287.572d {+19h 10m 17s} (1950)
GRB_DEC:         +22.438d {+22d 26' 16"} (J2000),
                 +22.469d {+22d 28' 08"} (current),
                 +22.353d {+22d 21' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       26455 [cnts]    Image_Peak=295 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   335     E_range: 25-100 keV
BKG_INTEN:       195448 [cnts]
BKG_TIME:        55140.06 SOD {15:19:00.06} UT
BKG_DUR:         64 [sec]
GRB_DATE:        18059 TJD;   306 DOY;   17/11/02
GRB_TIME:        55229.59 SOD {15:20:29.59} UT
GRB_PHI:          59.33 [deg]
GRB_THETA:        37.02 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.32 [sigma]
IMAGE_SIGNIF:    7.05 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  -3  +0  +1 -20  +0 
SUN_POSTN:       217.98d {+14h 31m 55s}  -14.94d {-14d 56' 13"}
SUN_DIST:         78.33 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.01d {+01h 16m 01s}   +3.46d {+03d 27' 43"}
MOON_DIST:        89.34 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.27,  5.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.70, 44.40 [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 = 31.57,17.45 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:22:39 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.073d {+19h 12m 18s} (J2000)
POINT_DEC:       +22.431d {+22d 25' 51"} (J2000)
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55353.37 SOD {15:22:33.37} UT,   123.8 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:24:29 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     785510,   Seg_Num: 0
GRB_RA:          288.103d {+19h 12m 25s} (J2000),
                 288.293d {+19h 13m 10s} (current),
                 287.572d {+19h 10m 17s} (1950)
GRB_DEC:         +22.438d {+22d 26' 16"} (J2000),
                 +22.469d {+22d 28' 08"} (current),
                 +22.353d {+22d 21' 09"} (1950)
GRB_DATE:        18059 TJD;   306 DOY;   17/11/02
GRB_TIME:        55229.59 SOD {15:20:29.59} UT
TRIGGER_INDEX:   335
GRB_PHI:          59.33 [deg]
GRB_THETA:        37.02 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.32 [sigma]
IMAGE_SIGNIF:    7.05 [sigma]
LC_URL:          sw00785510000msb.lc
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 15"}
SUN_DIST:         78.33 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.03d {+01h 16m 08s}   +3.47d {+03d 28' 20"}
MOON_DIST:        89.36 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.27,  5.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.70, 44.40 [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 = 31.57,17.45 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:26:23 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     785510,   Seg_Num: 0
GRB_RA:          288.0780d {+19h 12m 18.71s} (J2000),
                 288.2675d {+19h 13m 04.21s} (current),
                 287.5467d {+19h 10m 11.21s} (1950)
GRB_DEC:         +22.4451d {+22d 26' 42.3"} (J2000),
                 +22.4761d {+22d 28' 33.8"} (current),
                 +22.3599d {+22d 21' 35.7"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55376.00 SOD {15:22:56.00} UT,   146.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 17"}
SUN_DIST:         78.31 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.05d {+01h 16m 12s}   +3.48d {+03d 28' 43"}
MOON_DIST:        89.39 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.27,  5.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.67, 44.41 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:27:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.073d {+19h 12m 18s} (J2000)
POINT_DEC:       +22.431d {+22d 25' 52"} (J2000)
POINT_ROLL:      248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55354.33 SOD {15:22:34.33} UT,   124.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.773
N_STARS:         190
X_OFFSET:        32 [pixels]
Y_OFFSET:        408 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1847 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00785510000msufc0124.fits
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 17"}
SUN_DIST:         78.30 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.06d {+01h 16m 14s}   +3.48d {+03d 28' 52"}
MOON_DIST:        89.41 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.69 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:27:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.073d {+19h 12m 18s} (J2000)
POINT_DEC:       +22.431d {+22d 25' 52"} (J2000)
POINT_ROLL:      248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55354.33 SOD {15:22:34.33} UT,   124.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.773
N_STARS:         190
X_OFFSET:        32 [pixels]
Y_OFFSET:        408 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1847 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00785510000msufc0124.fits
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 18"}
SUN_DIST:         78.30 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.06d {+01h 16m 15s}   +3.48d {+03d 28' 56"}
MOON_DIST:        89.41 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.69 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.40 [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:     Thu 02 Nov 17 15:28:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.073d {+19h 12m 18s} (J2000)
POINT_DEC:       +22.431d {+22d 25' 52"} (J2000)
ROLL:            248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55354.33 SOD {15:22:34.33} UT,   124.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     531328974
X_OFFSET:        591 [pixels]
Y_OFFSET:        967 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       751
Y_GRB_POS:       1127
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni0144.fits
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 18"}
SUN_DIST:         78.30 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.07d {+01h 16m 17s}   +3.49d {+03d 29' 06"}
MOON_DIST:        89.41 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.69 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:28:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.073d {+19h 12m 18s} (J2000)
POINT_DEC:       +22.431d {+22d 25' 52"} (J2000)
ROLL:            248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55354.33 SOD {15:22:34.33} UT,   124.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     531328974
X_OFFSET:        591 [pixels]
Y_OFFSET:        967 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       751
Y_GRB_POS:       1127
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni0144.fits
SUN_POSTN:       217.98d {+14h 31m 56s}  -14.94d {-14d 56' 18"}
SUN_DIST:         78.30 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.07d {+01h 16m 17s}   +3.49d {+03d 29' 07"}
MOON_DIST:        89.41 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.69 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #22082
T. N. Ukwatta (LANL), D. N. Burrows (PSU), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), Alex Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), H. A. Krimm (NSF/USRA), S. J. LaPorte (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 15:20:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 171102B (trigger=785510). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 288.103, +22.438 which is
```
   RA(J2000) = 19h 12m 25s
   Dec(J2000) = +22d 26' 16"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 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 15:22:33.3 UT, 123.8 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 288.07776, 22.44512 which is equivalent to:
```
   RA(J2000)  = 19h 12m 18.66s
   Dec(J2000) = +22d 26' 42.4"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 87 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.51 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 124 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.75.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:40:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.071d {+19h 12m 17s} (J2000)
POINT_DEC:       +22.428d {+22d 25' 42"} (J2000)
POINT_ROLL:      248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  56111.85 SOD {15:35:11.85} UT,   882.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.490
N_STARS:         190
X_OFFSET:        32 [pixels]
Y_OFFSET:        408 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1847 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00785510000msufc0882.fits
SUN_POSTN:       217.99d {+14h 31m 58s}  -14.94d {-14d 56' 27"}
SUN_DIST:         78.29 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.18d {+01h 16m 43s}   +3.52d {+03d 31' 26"}
MOON_DIST:        89.50 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:40:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.071d {+19h 12m 17s} (J2000)
POINT_DEC:       +22.428d {+22d 25' 42"} (J2000)
POINT_ROLL:      248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  56111.85 SOD {15:35:11.85} UT,   882.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.490
N_STARS:         190
X_OFFSET:        32 [pixels]
Y_OFFSET:        408 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1847 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00785510000msufc0882.fits
SUN_POSTN:       217.99d {+14h 31m 58s}  -14.94d {-14d 56' 28"}
SUN_DIST:         78.29 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.18d {+01h 16m 44s}   +3.52d {+03d 31' 29"}
MOON_DIST:        89.50 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.39 [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:     Thu 02 Nov 17 15:41:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.071d {+19h 12m 17s} (J2000)
POINT_DEC:       +22.428d {+22d 25' 42"} (J2000)
ROLL:            248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  56111.85 SOD {15:35:11.85} UT,   882.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     531329731
X_OFFSET:        591 [pixels]
Y_OFFSET:        967 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       751
Y_GRB_POS:       1127
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni0902.fits
SUN_POSTN:       217.99d {+14h 31m 58s}  -14.94d {-14d 56' 28"}
SUN_DIST:         78.29 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.19d {+01h 16m 46s}   +3.53d {+03d 31' 40"}
MOON_DIST:        89.51 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 15:41:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.071d {+19h 12m 17s} (J2000)
POINT_DEC:       +22.428d {+22d 25' 42"} (J2000)
ROLL:            248.190d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  56111.85 SOD {15:35:11.85} UT,   882.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     531329731
X_OFFSET:        591 [pixels]
Y_OFFSET:        967 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       751
Y_GRB_POS:       1127
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni0902.fits
SUN_POSTN:       217.99d {+14h 31m 59s}  -14.94d {-14d 56' 29"}
SUN_DIST:         78.29 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.19d {+01h 16m 46s}   +3.53d {+03d 31' 42"}
MOON_DIST:        89.51 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.25,  5.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.66, 44.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 16:46:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.127d {+19h 12m 31s} (J2000)
POINT_DEC:       +22.453d {+22d 27' 10"} (J2000)
POINT_ROLL:      248.257d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  60208.40 SOD {16:43:28.40} UT,   4978.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.346
N_STARS:         190
X_OFFSET:        622 [pixels]
Y_OFFSET:        428 [pixels]
X_MAX:           1581 [pixels]
Y_MAX:           1387 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00785510000msufc4978.fits
SUN_POSTN:       218.04d {+14h 32m 09s}  -14.96d {-14d 57' 19"}
SUN_DIST:         78.31 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.80d {+01h 19m 11s}   +3.74d {+03d 44' 32"}
MOON_DIST:        89.93 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.29,  5.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.74, 44.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 16:46:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.127d {+19h 12m 31s} (J2000)
POINT_DEC:       +22.453d {+22d 27' 10"} (J2000)
POINT_ROLL:      248.257d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  60208.40 SOD {16:43:28.40} UT,   4978.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.346
N_STARS:         190
X_OFFSET:        622 [pixels]
Y_OFFSET:        428 [pixels]
X_MAX:           1581 [pixels]
Y_MAX:           1387 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00785510000msufc4978.fits
SUN_POSTN:       218.04d {+14h 32m 09s}  -14.96d {-14d 57' 20"}
SUN_DIST:         78.31 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.80d {+01h 19m 12s}   +3.74d {+03d 44' 36"}
MOON_DIST:        89.94 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.29,  5.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.74, 44.41 [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:     Thu 02 Nov 17 16:46:49 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     785510,   Seg_Num: 0
GRB_RA:          288.0772d {+19h 12m 18.52s} (J2000),
                 288.2667d {+19h 13m 04.01s} (current),
                 287.5459d {+19h 10m 11.02s} (1950)
GRB_DEC:         +22.4444d {+22d 26' 39.8"} (J2000),
                 +22.4754d {+22d 28' 31.3"} (current),
                 +22.3592d {+22d 21' 33.2"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  55376.00 SOD {15:22:56.00} UT,   146.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       218.04d {+14h 32m 09s}  -14.96d {-14d 57' 20"}
SUN_DIST:         78.27 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.80d {+01h 19m 12s}   +3.74d {+03d 44' 38"}
MOON_DIST:        89.98 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.27,  5.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.67, 44.41 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 16:48:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.127d {+19h 12m 31s} (J2000)
POINT_DEC:       +22.453d {+22d 27' 10"} (J2000)
ROLL:            248.257d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  60208.40 SOD {16:43:28.40} UT,   4978.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     531333828
X_OFFSET:        941 [pixels]
Y_OFFSET:        747 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1101
Y_GRB_POS:       907
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni4998.fits
SUN_POSTN:       218.04d {+14h 32m 09s}  -14.96d {-14d 57' 21"}
SUN_DIST:         78.31 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.81d {+01h 19m 15s}   +3.75d {+03d 44' 54"}
MOON_DIST:        89.95 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.29,  5.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.74, 44.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 Nov 17 16:48:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     785510,   Seg_Num: 0
POINT_RA:        288.127d {+19h 12m 31s} (J2000)
POINT_DEC:       +22.453d {+22d 27' 10"} (J2000)
ROLL:            248.257d
IMG_START_DATE:  18059 TJD;   306 DOY;   17/11/02
IMG_START_TIME:  60208.40 SOD {16:43:28.40} UT,   4978.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     531333828
X_OFFSET:        941 [pixels]
Y_OFFSET:        747 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1101
Y_GRB_POS:       907
BINNING_INDEX:   1
IM_URL:          sw00785510000msuni4998.fits
SUN_POSTN:       218.04d {+14h 32m 09s}  -14.96d {-14d 57' 21"}
SUN_DIST:         78.31 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:       19.81d {+01h 19m 15s}   +3.75d {+03d 44' 56"}
MOON_DIST:        89.95 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       55.29,  5.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.74, 44.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #22084
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1915 s of XRT Photon Counting mode data and 5 UVOT images for GRB 171102B, 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 = 288.07787, +22.44433 which is equivalent to:
```
RA (J2000): 19h 12m 18.69s
Dec (J2000): +22d 26' 39.6"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #22085
S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Tohuvavohu (PSU) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 171102B (Ukwatta et al. GCN Circ. 22082), from 110 s to 24.1 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (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. 22084).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.58 (+0.08, -0.11), followed by a break at T+5902 s to an alpha of 1.32 (+0.43, -0.17).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.17 (+0.17, -0.16). The best-fitting absorption column is 5.8 (+1.7, -1.3) x 10^21 cm^-2, consistent with the Galactic value of 4.5 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 6.9 x 10^-11 (8.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.8 (+1.7, -1.3) x 10^21 cm^-2
Galactic foreground: 4.5 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.17 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 1.32, the count rate at T+24 hours will be 4.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.8 x 10^-13 (3.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00785510.
This circular is an official product of the Swift-XRT team.
GCN Circular #22086
GRB 171102B: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171102B 125 s after the BAT trigger (Ukwatta et al., GCN Circ. 22082). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 22084) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC          4979         5129          147         >20.2
u_FC               125          375          246         >19.8
white             4979         5749          344         >20.5
v                  432        11930         1160         >19.3
b                  381        18368         1057         >20.5
u                  125        24106         2391         >21.5
w1                 481        23421         2042         >20.7
m2                 456        22515         1843         >21.3
w2                 407        11017         1179         >20.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.75 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22087
S. Harita, R. Itoh, K. L. Muarata, Y. Tachibana, T. Yoshii, K. Morita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB171102B (T. N. Ukwatta et al., GCN Circular #22082) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2017-11-03 09:05:03.04 UT . We did not find any new point source within XRT circle in all three bands.
We obtained following limits for the magnitudes.
```
T0+[hour]    MID-UT      T-EXP[sec]         g'              Rc
 Ic
-------------------------------------------------------------------------------------------------------
~17.742       09:24:59           300          >18.2        >17.5
>16.9
-------------------------------------------------------------------------------------------------------
```
T0+ : Elapsed time after the burst T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
GCN Circular #22088
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 171102B (trigger #785510) (Ukwatta et al., GCN Circ. 22082). The BAT ground-calculated position is RA, Dec = 288.096, 22.434 deg which is
```
   RA(J2000)  =  19h 12m 23.0s
   Dec(J2000) = +22d 26' 03.2"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 22%.
The mask-weighted light curve shows a weak pulse that starts at ~ T-6 s and ends at ~ T+14 s. T90 (15-350 keV) is 17.8 +- 3.1 sec (estimated error including systematics).
The time-averaged spectrum from T-6.18 to T+13.72 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.16 +- 0.24. The fluence in the 15-150 keV band is 9.3 +- 1.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.51 sec in the 15-150 keV band is 1.2 +- 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/785510/BA/
GCN Circular #22089
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harvey Moseley (GSFC ), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 171102B (Ukwatta, et al., GCN 22082) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2017/11 3.14 to 2017/11 3.20 UTC (11.99 to 13.55 hours after the BAT trigger), obtaining a total of 0.98 hours exposure in the r and i bands and 0.42 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Osborne, et al., GCN 22084), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
 r > 22.51
 i > 22.59
 Z > 21.14
 Y > 21.53
 J > 21.36
 H > 20.97
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
GCN Circular #22090
H.J. Tan (CCU), Z.P. Zhu, H.X. Feng, D. Xu (NAOC), Y.D. Hu (IAA-CSIC), X. Gao (Urumqi No.1 Senior High School) report:
We observed the field of GRB 171102B (Ukwatta et al., GCN 22082) using the 0.36m and 0.60m telescopes located at Nanshan, Xinjiang, China. All imaged were taken without filter.
Our photometry was summarized as follows:
```
========================================
Tmid(s)+T0  Telescope  Exptime(s)       UL(R)

389               36cm        40*3             >16.10

645               60cm        30*3             >17.80

1365             60cm        60*15           >18.55

========================================
```
Note: (1) Photometry is calibrated with stars (R2 magnitude) in the USNO B1 catalogue, although images were taken without filter.
GCN Circular #22092
E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), A. Pozanenko (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170822A (Ukwatta et al., GCN 22082) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Nov., 02 (UT) 15:47:45. We took several images in R-filter. Within enhanced XRT error circle (Osborne et al., GCN 22084) we do not detect any object. Preliminary photometry of the afterglow is following.
```
Date       UT start   t-T0    Filter Exp.  OT     Err. UL
                      (mid, days)     (s)             (3 sigma)

2017-11-02 15:47:45  0.04377  R    30*120  n/d    n/d  20.1
```
Photometry is based on nearby USNO-B1.0 stars R2 magnitudes
```
USNO-B.1_id  R2
1124-0422739 16.70
1124-0422527 16.20
1124-0422440 15.76
```
GCN Circular #22093
E. Mazaeva (IKI), R. Inasaridze (AbAO), A. Pozanenko (IKI), A. Volnova (IKI), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170822A (Ukwatta et al., GCN 22082) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Nov., 02 (UT) 15:53:26. We obtained several unfiltered images of the field. Within enhanced XRT error circle (Osborne et al., GCN 22084) we do not detect any object. Preliminary photometry of the field is following
```
Date        UT start  t-T0     Filter Exp.   OT   Err UpLim (3 sigma)
                       (mid, days)     (s)

2017-11-02 15:53:26   0.05497  CR     53*60  n/d  n/d 21.7
```
Photometry is based on nearby USNO-B1.0 stars R2 magnitudes
```
USNO-B.1_id  R2
1124-0422571 18.10
1124-0422577 17.52
1124-0422572 18.34
1124-0422730 17.80
```
A finding chart can be found at http://grb.rssi.ru/GRB171102B/GRB171102B_AAO_171102.png

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Jochen Greiner, last update: 03-Nov-2017 [Disclaimer]