Gamma-ray Burst 141031A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:18:58 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     617110,   Seg_Num: 0
GRB_RA:          128.599d {+08h 34m 24s} (J2000),
                 128.681d {+08h 34m 43s} (current),
                 128.322d {+08h 33m 17s} (1950)
GRB_DEC:         -59.138d {-59d 08' 15"} (J2000),
                 -59.189d {-59d 11' 21"} (current),
                 -58.965d {-58d 57' 52"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6268 [cnts]    Image_Peak=218 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   264     E_range: 25-100 keV
BKG_INTEN:       59965 [cnts]
BKG_TIME:        26275.27 SOD {07:17:55.27} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26306.69 SOD {07:18:26.69} UT
GRB_PHI:         -71.95 [deg]
GRB_THETA:        34.44 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     16.06 [sigma]
IMAGE_SIGNIF:    8.53 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -1  +0  +0 -23  +0 
SUN_POSTN:       215.43d {+14h 21m 42s}  -14.11d {-14d 06' 19"}
SUN_DIST:         76.26 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.45d {+20h 45m 47s}  -12.92d {-12d 55' 24"}
MOON_DIST:       107.85 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.84,-11.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.29,-71.27 [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 = 336.88,15.15 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=436432704).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:18:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     436432704
GRB_RA:          141.333d {+09h 25m 20s} (J2000),
                 141.314d {+09h 25m 15s} (current),
                 141.390d {+09h 25m 33s} (1950)
GRB_DEC:         -76.100d {-76d 05' 59"} (J2000),
                 -76.164d {-76d 09' 51"} (current),
                 -75.883d {-75d 52' 56"} (1950)
GRB_ERROR:       24.90 [deg radius, statistical plus systematic]
GRB_INTEN:       60 [cnts/sec]
DATA_SIGNIF:     5.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26301.67 SOD {07:18:21.67} UT
GRB_PHI:           9.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.78
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       215.43d {+14h 21m 42s}  -14.11d {-14d 06' 19"}
SUN_DIST:         72.53 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      311.44d {+20h 45m 46s}  -12.92d {-12d 55' 26"}
MOON_DIST:        90.71 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      291.52,-18.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      232.95,-71.86 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn141031304/quicklook/glg_lc_medres34_bn141031304.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.82,-13.02 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:18:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     436432704
GRB_RA:          114.733d {+07h 38m 56s} (J2000),
                 114.823d {+07h 39m 17s} (current),
                 114.432d {+07h 37m 44s} (1950)
GRB_DEC:         -53.350d {-53d 21' 00"} (J2000),
                 -53.385d {-53d 23' 04"} (current),
                 -53.234d {-53d 14' 02"} (1950)
GRB_ERROR:       10.98 [deg radius, statistical plus systematic]
GRB_INTEN:       134 [cnts/sec]
DATA_SIGNIF:     13.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26301.67 SOD {07:18:21.67} UT
GRB_PHI:          53.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       215.43d {+14h 21m 42s}  -14.11d {-14d 06' 19"}
SUN_DIST:         84.88 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      311.44d {+20h 45m 46s}  -12.92d {-12d 55' 26"}
MOON_DIST:       112.18 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      265.75,-14.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      144.48,-72.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn141031304/quicklook/glg_lc_medres34_bn141031304.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 231.82,-13.02 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:19:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     436432704
GRB_RA:          128.060d {+08h 32m 14s} (J2000),
                 128.120d {+08h 32m 29s} (current),
                 127.857d {+08h 31m 26s} (1950)
GRB_DEC:         -63.460d {-63d 27' 35"} (J2000),
                 -63.511d {-63d 30' 38"} (current),
                 -63.289d {-63d 17' 19"} (1950)
GRB_ERROR:       7.31 [deg radius, statistical only]
DATA_SIGNIF:     13.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26301.67 SOD {07:18:21.67} UT
GRB_PHI:          32.00 [deg]
GRB_THETA:        36.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       215.43d {+14h 21m 42s}  -14.11d {-14d 06' 19"}
SUN_DIST:         76.20 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.45d {+20h 45m 47s}  -12.92d {-12d 55' 22"}
MOON_DIST:       103.52 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      278.33,-13.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      186.85,-73.89 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn141031304/quicklook/glg_lc_medres34_bn141031304.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=617110).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:19:28 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      67
TRIGGER_NUM:     436432704
GRB_RA:          115.380d {+07h 41m 31s} (J2000),
                 115.424d {+07h 41m 42s} (current),
                 115.229d {+07h 40m 55s} (1950)
GRB_DEC:         -62.850d {-62d 51' 00"} (J2000),
                 -62.885d {-62d 53' 07"} (current),
                 -62.731d {-62d 43' 51"} (1950)
GRB_ERROR:       5.74 [deg radius, statistical only]
DATA_SIGNIF:     15.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26301.67 SOD {07:18:21.67} UT
GRB_PHI:          37.00 [deg]
GRB_THETA:        31.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       215.43d {+14h 21m 42s}  -14.11d {-14d 06' 19"}
SUN_DIST:         81.94 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      311.45d {+20h 45m 48s}  -12.92d {-12d 55' 20"}
MOON_DIST:       103.17 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.91,-18.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      172.91,-78.63 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn141031304/quicklook/glg_lc_medres34_bn141031304.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=617110).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:20:16 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.561d {+08h 34m 15s} (J2000)
POINT_DEC:       -59.146d {-59d 08' 46"} (J2000)
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26405.59 SOD {07:20:05.59} UT,   98.9 [sec] since BAT Trigger Time
COUNTS:          6    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:22:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     617110,   Seg_Num: 0
GRB_RA:          128.599d {+08h 34m 24s} (J2000),
                 128.681d {+08h 34m 43s} (current),
                 128.322d {+08h 33m 17s} (1950)
GRB_DEC:         -59.138d {-59d 08' 15"} (J2000),
                 -59.189d {-59d 11' 21"} (current),
                 -58.965d {-58d 57' 52"} (1950)
GRB_DATE:        16961 TJD;   304 DOY;   14/10/31
GRB_TIME:        26306.69 SOD {07:18:26.69} UT
TRIGGER_INDEX:   264
GRB_PHI:         -71.95 [deg]
GRB_THETA:        34.44 [deg]
DELTA_TIME:      58.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.06 [sigma]
IMAGE_SIGNIF:    8.53 [sigma]
LC_URL:          sw00617110000msb.lc
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 21"}
SUN_DIST:         76.26 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.48d {+20h 45m 54s}  -12.92d {-12d 54' 58"}
MOON_DIST:       107.86 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.84,-11.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.29,-71.27 [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 = 336.88,15.15 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:23:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.562d {+08h 34m 15s} (J2000)
POINT_DEC:       -59.146d {-59d 08' 45"} (J2000)
POINT_ROLL:      94.714d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26409.19 SOD {07:20:09.19} UT,   102.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.805
N_STARS:         190
X_OFFSET:        582 [pixels]
Y_OFFSET:        421 [pixels]
X_MAX:           1541 [pixels]
Y_MAX:           1380 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00617110000msufc0102.fits
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 22"}
SUN_DIST:         76.28 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.49d {+20h 45m 57s}  -12.91d {-12d 54' 48"}
MOON_DIST:       107.85 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.27,-71.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:23:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.562d {+08h 34m 15s} (J2000)
POINT_DEC:       -59.146d {-59d 08' 45"} (J2000)
POINT_ROLL:      94.714d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26409.19 SOD {07:20:09.19} UT,   102.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.805
N_STARS:         190
X_OFFSET:        582 [pixels]
Y_OFFSET:        421 [pixels]
X_MAX:           1541 [pixels]
Y_MAX:           1380 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00617110000msufc0102.fits
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 23"}
SUN_DIST:         76.28 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.49d {+20h 45m 59s}  -12.91d {-12d 54' 44"}
MOON_DIST:       107.85 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.27,-71.29 [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:     Fri 31 Oct 14 07:24:48 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     617110,   Seg_Num: 0
GRB_RA:          128.6081d {+08h 34m 25.94s} (J2000),
                 128.6900d {+08h 34m 45.59s} (current),
                 128.3315d {+08h 33m 19.56s} (1950)
GRB_DEC:         -59.1682d {-59d 10' 05.5"} (J2000),
                 -59.2198d {-59d 13' 11.1"} (current),
                 -58.9950d {-58d 59' 42.0"} (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:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26444.00 SOD {07:20:44.00} UT,   137.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 24"}
SUN_DIST:         76.25 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.50d {+20h 46m 01s}  -12.91d {-12d 54' 36"}
MOON_DIST:       107.83 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.86,-11.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      175.37,-71.29 [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:     Fri 31 Oct 14 07:24:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.562d {+08h 34m 15s} (J2000)
POINT_DEC:       -59.146d {-59d 08' 45"} (J2000)
ROLL:            94.714d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26409.19 SOD {07:20:09.19} UT,   102.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     436432821
X_OFFSET:        901 [pixels]
Y_OFFSET:        740 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1061
Y_GRB_POS:       900
BINNING_INDEX:   1
IM_URL:          sw00617110000msuni0115.fits
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 24"}
SUN_DIST:         76.28 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.50d {+20h 46m 01s}  -12.91d {-12d 54' 36"}
MOON_DIST:       107.85 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.27,-71.29 [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:     Fri 31 Oct 14 07:25:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.562d {+08h 34m 15s} (J2000)
POINT_DEC:       -59.146d {-59d 08' 45"} (J2000)
ROLL:            94.714d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26409.19 SOD {07:20:09.19} UT,   102.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     436432821
X_OFFSET:        901 [pixels]
Y_OFFSET:        740 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1061
Y_GRB_POS:       900
BINNING_INDEX:   1
IM_URL:          sw00617110000msuni0115.fits
SUN_POSTN:       215.43d {+14h 21m 43s}  -14.11d {-14d 06' 24"}
SUN_DIST:         76.28 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.51d {+20h 46m 02s}  -12.91d {-12d 54' 32"}
MOON_DIST:       107.86 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.27,-71.29 [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 #16995
B.P. Gompertz (U Leicester), J. R. Cummings (NASA/UMBC), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 07:18:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 141031A (trigger=617110). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 128.599, -59.138 which is
```
   RA(J2000) = 08h 34m 24s
   Dec(J2000) = -59d 08' 15"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed one peak with a duration of about 20 sec. The peak count rate was ~1437 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 07:20:05.5 UT, 98.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 128.60808, -59.16815 which is equivalent to:
```
   RA(J2000)  = 08h 34m 25.94s
   Dec(J2000) = -59d 10' 05.3"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 109 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.17 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 2.4 (+2.45/-2.14) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 102 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is B.P. Gompertz (bpg6 AT le.ac.uk). 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:     Fri 31 Oct 14 07:48:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 41"} (J2000)
POINT_ROLL:      94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26621.88 SOD {07:23:41.88} UT,   315.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.789
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        181 [pixels]
X_MAX:           1781 [pixels]
Y_MAX:           1620 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00617110000msufc0315.fits
SUN_POSTN:       215.45d {+14h 21m 47s}  -14.11d {-14d 06' 43"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.73d {+20h 46m 56s}  -12.86d {-12d 51' 24"}
MOON_DIST:       107.90 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:48:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 41"} (J2000)
POINT_ROLL:      94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26621.88 SOD {07:23:41.88} UT,   315.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.789
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        181 [pixels]
X_MAX:           1781 [pixels]
Y_MAX:           1620 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00617110000msufc0315.fits
SUN_POSTN:       215.45d {+14h 21m 47s}  -14.11d {-14d 06' 43"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.74d {+20h 46m 57s}  -12.86d {-12d 51' 21"}
MOON_DIST:       107.90 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [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:     Fri 31 Oct 14 07:49:11 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     617110,   Seg_Num: 0
GRB_RA:          128.6081d {+08h 34m 25.94s} (J2000),
                 128.6900d {+08h 34m 45.59s} (current),
                 128.3315d {+08h 33m 19.56s} (1950)
GRB_DEC:         -59.1685d {-59d 10' 06.6"} (J2000),
                 -59.2201d {-59d 13' 12.2"} (current),
                 -58.9953d {-58d 59' 43.0"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26444.00 SOD {07:20:44.00} UT,   137.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       215.45d {+14h 21m 47s}  -14.11d {-14d 06' 43"}
SUN_DIST:         76.26 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.74d {+20h 46m 58s}  -12.86d {-12d 51' 17"}
MOON_DIST:       107.88 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.86,-11.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      175.37,-71.29 [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:     Fri 31 Oct 14 07:49:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 41"} (J2000)
ROLL:            94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26621.88 SOD {07:23:41.88} UT,   315.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     436433034
X_OFFSET:        901 [pixels]
Y_OFFSET:        740 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1061
Y_GRB_POS:       900
BINNING_INDEX:   1
IM_URL:          sw00617110000msuni0328.fits
SUN_POSTN:       215.45d {+14h 21m 47s}  -14.11d {-14d 06' 44"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.75d {+20h 46m 59s}  -12.85d {-12d 51' 12"}
MOON_DIST:       107.91 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [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:     Fri 31 Oct 14 07:50:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 41"} (J2000)
ROLL:            94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  26621.88 SOD {07:23:41.88} UT,   315.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     436433034
X_OFFSET:        901 [pixels]
Y_OFFSET:        740 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1061
Y_GRB_POS:       900
BINNING_INDEX:   1
IM_URL:          sw00617110000msuni0328.fits
SUN_POSTN:       215.45d {+14h 21m 47s}  -14.11d {-14d 06' 44"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.75d {+20h 47m 00s}  -12.85d {-12d 51' 10"}
MOON_DIST:       107.91 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [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:     Fri 31 Oct 14 07:51:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 42"} (J2000)
POINT_ROLL:      94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  27178.74 SOD {07:32:58.74} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.286
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        181 [pixels]
X_MAX:           1781 [pixels]
Y_MAX:           1620 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    13
SL_URL:          sw00617110000msufc0872.fits
SUN_POSTN:       215.45d {+14h 21m 48s}  -14.11d {-14d 06' 45"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.77d {+20h 47m 04s}  -12.85d {-12d 50' 56"}
MOON_DIST:       107.91 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Oct 14 07:52:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     617110,   Seg_Num: 0
POINT_RA:        128.555d {+08h 34m 13s} (J2000)
POINT_DEC:       -59.145d {-59d 08' 42"} (J2000)
POINT_ROLL:      94.721d
IMG_START_DATE:  16961 TJD;   304 DOY;   14/10/31
IMG_START_TIME:  27178.74 SOD {07:32:58.74} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.286
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        181 [pixels]
X_MAX:           1781 [pixels]
Y_MAX:           1620 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    13
SL_URL:          sw00617110000msufc0872.fits
SUN_POSTN:       215.45d {+14h 21m 48s}  -14.11d {-14d 06' 46"}
SUN_DIST:         76.29 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      311.77d {+20h 47m 05s}  -12.85d {-12d 50' 52"}
MOON_DIST:       107.91 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      274.83,-11.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      175.26,-71.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #16996
M. Tanga, C. Delvaux (both MPE Garching), D. A. Kann (TLS Tautenburg), P. Schady and J. Greiner (both MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 141031A (Swift trigger 617110; Gompertz et al., GCN #16995) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at the ESO La Silla Observatory (Chile).
Observations started at 07:46 UT on 31 October 2014, 0.45 hrs after the GRB trigger. They were performed at an average seeing of 1.3" and at an average airmass of 1.33.
We found one single point source at the NW edge of the 2.1" Swift-XRT error circle reported by Gompertz et al. (GCN #16995) at
```
RA (J2000.0) = 08h 34m 25.75s
DEC (J2000.0) = -59d 10' 05.0"
```
with an uncertainty of 0.3" in each coordinate.
Based on the first 8.8 min of total exposures in g'r'i'z' and 8.0 min in JHK, we estimate preliminary magnitudes (all in AB system) of
```
g' = 22.7 +/- 0.1 mag,
r' = 21.7 +/- 0.1 mag,
i' = 21.5 +/- 0.1 mag,
z' = 21.5 +/- 0.1 mag,
J > 20.9 mag,
H > 20.3 mag, and
K > 18.7 mag.
```
At the moment we cannot confirm if the source is fading.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.17 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16997
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1789 s of XRT Photon Counting mode data and 2 UVOT images for GRB 141031A, 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 = 128.60838, -59.16828 which is equivalent to:
```
RA (J2000): 08h 34m 26.01s
Dec (J2000): -59d 10' 05.8"
```
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 #17001
O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team:
"At 07:18:21.67 UT on the 31st of October 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 141031A (trigger 436432704 / 141031304), which was also detected by Swift (Gompertz et al. 2014, GCN 16995). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift location.
The angle from the Fermi LAT boresight is about 34 degrees.
The GBM light curve consists of a single peak with a duration (T90) of about 19.4 s (50-300 keV). The time-averaged spectrum from T0-6.1 s to T0+13.3 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 410 +/- 66 keV.
A Band function fits the spectrum equally well with Epeak = 221 (+/-57) keV, alpha = -0.92 +/- 0.12 , and beta = -1.76 (+/-0.09).
The event fluence (10-1000 keV) in this time interval is (5.7 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.8 s in the 10-1000 keV band is 2.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #17002
D. Xu (DARK/NBI), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), S. D. Vergani (CNRS/GEPI), A. J. Levan (Univ. Warwick), J. P. U. Fynbo (DARK/NBI), N. R. Tanvir (Univ. Leicester), B. Milvang-Jensen (DARK/NBI), D. Malesani (DARK/NBI), K. Wiersema (Univ. Leicester), report on behalf of a larger collaboration:
We observed the field of GRB 141031A (Gompertz et al., GCN 16995) using the VLT X-shooter spectrograph, using the robotic rapid response mode (RRM).
In a 15-s acquisition image, taken at 7:41:19 UT (22.8 min after the GRB1), we identify three objects consistent with, or in the close vicinity of, the currently available XRT error circle (1.4" error radius; Evans et al., GCN 16997 and http://www.swift.ac.uk/xrt_positions/).
Their coordinates are (all J2000):
```
A)
RA = 08:34:26.11
Dec = -59:10:04.2

B)
RA = 08:34:25.73
Dec = -59:10:04.8

C)
RA = 08:34:26.05
Dec = -59:10:04.9
```
Sources A and C are partially blended. Source B is the one detected by GROND (GCN 16996), looks extended in our data (under 0.6" seeing), and is now formally outside the latest XRT position (2.7"+-1.4" away). The limiting magnitude of the image is R ~ 21.7. A finding chart is available at http://www.astro.ku.dk/~malesani/GRB/141031A/finder_XS.jpg
A later image (30 s exposure) was taken 104.5 min after the GRB. Image subtraction reveals no obvious variation of any of the sources, despite the significant time difference between the two epochs (factor of 4.5 in time since GRB).
A spectrum was secured of source A, covering the wavelength range 3000-25,000 AA. Several features are observed in absorption, including the Balmer series from Halpha to H15, and Ca H and K, at z = 0.0013. Such redshift is consistent with the Milky Way or the Local Group, though the corresponding velocity (390 km/s) is substantial for an origin in the MW disk.
Our slit did not cover, unfortunately, objects B and C. Further analysis is in progress, and we invite further monitoring of these object to single out variability.
We acknowldge excellent support from the observing staff in Paranal, in particular Juan Carlos Munoz-Mateos, Francisco Caceres, Rodrigo Romero, and Steffen Mieske.
GCN Circular #17004
A. Trotter, J. Haislip, D. Reichart, A. Aji, R. Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain report:
Skynet observed the Swift BAT/XRT localization of GRB 141031A (Gompertz et al., GCN 16995, Swift trigger=617110) with one 24" telescope (PROMPT 8; I band) and three 16" telescopes (PROMPT 3,4,5; B,R,I bands) of the PROMPT array at CTIO, Chile. Starting at 2014-10-31 07:19:46 UT and continuing until 08:53 UT (t=79s-94m post-trigger), Skynet took a total of 196 exposures ranging from 10s-160s each. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the OT position reported by GROND (Tanga et al., GCN 16996). Our 3-sigma limiting magnitudes are:
```
==================================
tmid  scope   expos  fil  limit
==================================
52m  PROMPT3 26x160s  B   >20.9
54m  PROMPT4 24x160s  R   >21.6
53m  PROMPT5 27x160s  I   >20.9
48m  PROMPT8 45x80s   I   >20.9
==================================
```
Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.15 (Schlafly & Finkbeiner 2011).
No further Skynet observations are scheduled.
GCN Circular #17005
M. de Pasquale (INAF-IASFPA), J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB) and B.P. Gompertz report on behalf of the Swift-XRT team:
We have analysed 8.0 ks of XRT data for GRB 141031A (Gompertz et al. GCN Circ. 16995), from 102 s to 24.0 ks after the BAT trigger. The data comprise 847 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 16997).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.06 (+/-0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.43 (+0.12, -0.11). The best-fitting absorption column is 2.44 (+0.64, -0.27) x 10^21 cm^-2, consistent with the Galactic value of 2.2 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 5.2 x 10^-11 (6.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.44 (+0.64, -0.27) x 10^21 cm^-2
Galactic foreground: 2.2 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.43 (+0.12, -0.11)
```
If the light curve continues to decay with a power-law decay index of 1.06, the count rate at T+24 hours will be 4.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.1 x 10^-13 (2.4 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/00617110.
This circular is an official product of the Swift-XRT team.
GCN Circular #17008
S. R. Oates (IAA-CSIC/UCL-MSSL) and B. P. Gompertz (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141031A 102 s after the BAT trigger (Gompertz et al., GCN Circ. 16995). No optical afterglow consistent with the possible optical position (Tanga et al. GCN Circ. 16996) or enhanced XRT position (Evans et al. GCN Circ. 16997) 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           102          252          147         >20.9
u_FC               315          565          246         >19.9
white              102        18038          967         >21.8
v                  646        13448          759         >20.0
b                  571        17791         1414         >21.4
u                  315        23978         1180         >20.7
w1                 696        23537         1396         >21.0
m2                 670         6964          529         >20.2
w2                 621        12030         1238         >21.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17010
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings, N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC) (i.e. the Swift-BAT team):
Using the data set from T-250 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 141031A (trigger #617110) (Gompertz, et al., GCN Circ. 16995). The BAT ground-calculated position is RA, Dec = 128.632, -59.160 deg which is
```
    RA(J2000)  =  08h 34m 31.6s
    Dec(J2000) = -59d 09' 36.8"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 32%.
The mask-weighted light curve shows three widely separated peaks. The first is a single symmetric peak from about T-20 to T+20 seconds, the second is another symmetric peak ~20 sec long at about T+800, and the third is two overlapping peaks from about T+850 to T+920 seconds. T90 (15-350 keV) is about 920 +- 10 sec (estimated error including systematics).
The time-averaged spectrum from T-22 to T+20 sec is best fit by a simple power-law model with a power law index of 1.21 +- 0.13. The time-averaged spectrum from T+770 to T+920 sec is also best fit by a simple power-law model with a power law index of 1.75 +- 0.18. The total fluence for both intervals in the 15-150 keV band is 2.9 +- 0.5 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+5.08 sec in the 15-150 keV band is 0.5 +- 0.2 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/617110/BA/
GCN Circular #17064
Klotz A., Turpin D. (IRAP-CNRS-OMP), Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 141031A detected by SWIFT (trigger 617110) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 45s after the GRB trigger (15s after the notice). The elevation of the field increased from 45 degrees above horizon and weather conditions were excellent.
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT with a limiting magnitude of: t0+45s to t0+105s : Rlim = 14.8
Following images are recorded in tracking mode. We used late images to substract non variable stars in the XRT error box.
The second image is 30.0s exposure in tracking mode: t0+119s to t0+149s : Rlim = 17.5
Later images (until 1800s after the trigger) do not show any optical afterglow at Rlim = 17.5
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.

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Jochen Greiner, last update: 13-Nov-2014 [Disclaimer]