Gamma-ray Burst 171007A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:58:08 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.544d {+09h 02m 10s} (J2000),
                 135.835d {+09h 03m 20s} (current),
                 134.720d {+08h 58m 53s} (1950)
GRB_DEC:         +42.849d {+42d 50' 57"} (J2000),
                 +42.779d {+42d 46' 43"} (current),
                 +43.047d {+43d 02' 48"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7767 [cnts]    Image_Peak=261 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       77172 [cnts]
BKG_TIME:        43020.19 SOD {11:57:00.19} UT
BKG_DUR:         24 [sec]
GRB_DATE:        18033 TJD;   280 DOY;   17/10/07
GRB_TIME:        43058.27 SOD {11:57:38.27} UT
GRB_PHI:          -8.97 [deg]
GRB_THETA:        10.18 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.67 [sigma]
IMAGE_SIGNIF:    8.18 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0 -32  +0 
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 49"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.34d {+02h 25m 22s}   +9.28d {+09d 16' 46"}
MOON_DIST:        90.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      125.21, 24.82 [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 = 271.55,13.03 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=529070264).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:58:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     529070264
GRB_RA:           88.067d {+05h 52m 16s} (J2000),
                  88.558d {+05h 54m 14s} (current),
                  86.686d {+05h 46m 45s} (1950)
GRB_DEC:         +69.417d {+69d 25' 00"} (J2000),
                 +69.420d {+69d 25' 11"} (current),
                 +69.404d {+69d 24' 14"} (1950)
GRB_ERROR:       25.63 [deg radius, statistical plus systematic]
GRB_INTEN:       83 [cnts/sec]
DATA_SIGNIF:     4.90 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18033 TJD;   280 DOY;   17/10/07
GRB_TIME:        43059.90 SOD {11:57:39.90} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.34
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   3%  GRO_J0422_32
DETECTORS:       1,1,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 49"}
SUN_DIST:        100.46 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:       36.34d {+02h 25m 22s}   +9.28d {+09d 16' 46"}
MOON_DIST:        68.68 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      144.18, 20.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.02, 45.98 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171007498/quicklook/glg_lc_medres34_bn171007498.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 209.42,25.43 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:58:19 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     529070264
GRB_RA:          139.210d {+09h 16m 50s} (J2000),
                 139.554d {+09h 18m 13s} (current),
                 138.235d {+09h 12m 57s} (1950)
GRB_DEC:         +61.090d {+61d 05' 24"} (J2000),
                 +61.015d {+61d 00' 54"} (current),
                 +61.299d {+61d 17' 57"} (1950)
GRB_ERROR:       12.31 [deg radius, statistical only]
DATA_SIGNIF:     7.50 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18033 TJD;   280 DOY;   17/10/07
GRB_TIME:        43059.90 SOD {11:57:39.90} UT
GRB_PHI:         330.00 [deg]
GRB_THETA:        34.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 49"}
SUN_DIST:         78.53 [deg]   Sun_angle= 3.6 [hr] (West of Sun)
MOON_POSTN:       36.34d {+02h 25m 22s}   +9.28d {+09d 16' 48"}
MOON_DIST:        88.18 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      153.92, 40.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.84, 42.65 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn171007498/quicklook/glg_lc_medres34_bn171007498.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_529070264.fits
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/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=777215).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:59:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.5999d {+09h 02m 23.97s} (J2000),
                 135.8914d {+09h 03m 33.94s} (current),
                 134.7769d {+08h 59m 06.46s} (1950)
GRB_DEC:         +42.8204d {+42d 49' 13.4"} (J2000),
                 +42.7496d {+42d 44' 58.4"} (current),
                 +43.0179d {+43d 01' 04.4"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.22e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.29 [sigma]
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43127.24 SOD {11:58:47.24} UT,   69.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.70 237.21 261.72 243.59
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 50"}
SUN_DIST:         70.93 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.35d {+02h 25m 24s}   +9.28d {+09d 16' 58"}
MOON_DIST:        90.61 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.43, 41.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      125.26, 24.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 3.02 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:59:27 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.5999d {+09h 02m 23.9s} (J2000),
                 135.8914d {+09h 03m 33.9s} (current),
                 134.7769d {+08h 59m 06.4s} (1950)
GRB_DEC:         +42.8204d {+42d 49' 13.4"} (J2000),
                 +42.7496d {+42d 44' 58.4"} (current),
                 +43.0179d {+43d 01' 04.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       28 [cnts]
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43127.24 SOD {11:58:47.24} UT,   69.0 [sec] since BAT Trigger Time
CENTROID_X:      224.98,  raw= 225  [pixels]
CENTROID_Y:      289.11,  raw= 289  [pixels]
ROLL:            117.28 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -21.88
GRB_POS_XRT_Z:   -191.92
IMAGE_URL:       sw00777215000msxps_rw.img
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 50"}
SUN_DIST:         70.93 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.35d {+02h 25m 25s}   +9.28d {+09d 17' 00"}
MOON_DIST:        90.61 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.43, 41.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      125.26, 24.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 11:59:25 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.5999d {+09h 02m 23.9s} (J2000),
                 135.8914d {+09h 03m 33.9s} (current),
                 134.7769d {+08h 59m 06.4s} (1950)
GRB_DEC:         +42.8204d {+42d 49' 13.4"} (J2000),
                 +42.7496d {+42d 44' 58.4"} (current),
                 +43.0179d {+43d 01' 04.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       28 [cnts]
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43127.24 SOD {11:58:47.24} UT,   69.0 [sec] since BAT Trigger Time
CENTROID_X:      224.98,  raw= 225  [pixels]
CENTROID_Y:      289.11,  raw= 289  [pixels]
ROLL:            117.28 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -21.88
GRB_POS_XRT_Z:   -191.92
IMAGE_URL:       sw00777215000msxps_rw.img
SUN_POSTN:       193.27d {+12h 53m 04s}   -5.68d {-05d 40' 50"}
SUN_DIST:         70.93 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.35d {+02h 25m 25s}   +9.28d {+09d 16' 60"}
MOON_DIST:        90.61 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.43, 41.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      125.26, 24.80 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:01:24 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.544d {+09h 02m 10s} (J2000),
                 135.835d {+09h 03m 20s} (current),
                 134.720d {+08h 58m 53s} (1950)
GRB_DEC:         +42.849d {+42d 50' 57"} (J2000),
                 +42.779d {+42d 46' 43"} (current),
                 +43.047d {+43d 02' 48"} (1950)
GRB_DATE:        18033 TJD;   280 DOY;   17/10/07
GRB_TIME:        43058.27 SOD {11:57:38.27} UT
TRIGGER_INDEX:   262
GRB_PHI:          -8.97 [deg]
GRB_THETA:        10.18 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.67 [sigma]
IMAGE_SIGNIF:    8.18 [sigma]
LC_URL:          sw00777215000msb.lc
SUN_POSTN:       193.27d {+12h 53m 05s}   -5.68d {-05d 40' 52"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.37d {+02h 25m 29s}   +9.29d {+09d 17' 21"}
MOON_DIST:        90.54 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      125.21, 24.82 [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 = 271.55,13.03 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:01:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.538d {+09h 02m 09s} (J2000)
POINT_DEC:       +42.849d {+42d 50' 58"} (J2000)
POINT_ROLL:      117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43135.67 SOD {11:58:55.67} UT,   77.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.676
N_STARS:         17
X_OFFSET:        504 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00777215000msufc0077.fits
SUN_POSTN:       193.27d {+12h 53m 05s}   -5.68d {-05d 40' 52"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.38d {+02h 25m 30s}   +9.29d {+09d 17' 27"}
MOON_DIST:        90.53 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:02:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.538d {+09h 02m 09s} (J2000)
POINT_DEC:       +42.849d {+42d 50' 58"} (J2000)
POINT_ROLL:      117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43135.67 SOD {11:58:55.67} UT,   77.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.676
N_STARS:         17
X_OFFSET:        504 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00777215000msufc0077.fits
SUN_POSTN:       193.27d {+12h 53m 05s}   -5.68d {-05d 40' 53"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.38d {+02h 25m 31s}   +9.29d {+09d 17' 30"}
MOON_DIST:        90.53 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:03:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.538d {+09h 02m 09s} (J2000)
POINT_DEC:       +42.849d {+42d 50' 58"} (J2000)
ROLL:            117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43135.67 SOD {11:58:55.67} UT,   77.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     529070355
X_OFFSET:        1164 [pixels]
Y_OFFSET:        739 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1324
Y_GRB_POS:       899
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0097.fits
SUN_POSTN:       193.27d {+12h 53m 05s}   -5.68d {-05d 40' 54"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.39d {+02h 25m 34s}   +9.29d {+09d 17' 41"}
MOON_DIST:        90.52 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:03:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.538d {+09h 02m 09s} (J2000)
POINT_DEC:       +42.849d {+42d 50' 58"} (J2000)
ROLL:            117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43135.67 SOD {11:58:55.67} UT,   77.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     529070355
X_OFFSET:        1164 [pixels]
Y_OFFSET:        739 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1324
Y_GRB_POS:       899
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0097.fits
SUN_POSTN:       193.27d {+12h 53m 05s}   -5.68d {-05d 40' 54"}
SUN_DIST:         70.98 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.39d {+02h 25m 34s}   +9.30d {+09d 17' 44"}
MOON_DIST:        90.52 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:10:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 08"} (J2000)
POINT_ROLL:      117.279d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43348.87 SOD {12:02:28.87} UT,   290.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.715
N_STARS:         21
X_OFFSET:        844 [pixels]
Y_OFFSET:        419 [pixels]
X_MAX:           1803 [pixels]
Y_MAX:           1378 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00777215000msufc0290.fits
SUN_POSTN:       193.27d {+12h 53m 06s}   -5.68d {-05d 41' 00"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.46d {+02h 25m 50s}   +9.32d {+09d 18' 54"}
MOON_DIST:        90.46 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:10:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 08"} (J2000)
POINT_ROLL:      117.279d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43348.87 SOD {12:02:28.87} UT,   290.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.715
N_STARS:         21
X_OFFSET:        844 [pixels]
Y_OFFSET:        419 [pixels]
X_MAX:           1803 [pixels]
Y_MAX:           1378 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00777215000msufc0290.fits
SUN_POSTN:       193.27d {+12h 53m 06s}   -5.68d {-05d 41' 00"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.46d {+02h 25m 50s}   +9.32d {+09d 18' 56"}
MOON_DIST:        90.46 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:10:41 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     777215,   Seg_Num: 0
GRB_RA:          135.6005d {+09h 02m 24.12s} (J2000),
                 135.8920d {+09h 03m 34.08s} (current),
                 134.7775d {+08h 59m 06.60s} (1950)
GRB_DEC:         +42.8194d {+42d 49' 09.8"} (J2000),
                 +42.7486d {+42d 44' 54.8"} (current),
                 +43.0169d {+43d 01' 00.8"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43257.00 SOD {12:00:57.00} UT,   198.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       193.27d {+12h 53m 06s}   -5.68d {-05d 41' 01"}
SUN_DIST:         70.93 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.46d {+02h 25m 51s}   +9.32d {+09d 18' 60"}
MOON_DIST:        90.51 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.43, 41.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      125.26, 24.80 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:11:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 08"} (J2000)
ROLL:            117.279d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43348.87 SOD {12:02:28.87} UT,   290.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     529070568
X_OFFSET:        1164 [pixels]
Y_OFFSET:        739 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1324
Y_GRB_POS:       899
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0310.fits
SUN_POSTN:       193.28d {+12h 53m 06s}   -5.68d {-05d 41' 02"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.47d {+02h 25m 53s}   +9.32d {+09d 19' 09"}
MOON_DIST:        90.45 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:11:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 08"} (J2000)
ROLL:            117.279d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43348.87 SOD {12:02:28.87} UT,   290.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     529070568
X_OFFSET:        1164 [pixels]
Y_OFFSET:        739 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1324
Y_GRB_POS:       899
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0310.fits
SUN_POSTN:       193.28d {+12h 53m 06s}   -5.68d {-05d 41' 02"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.47d {+02h 25m 53s}   +9.32d {+09d 19' 11"}
MOON_DIST:        90.45 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #21976
J. K. Cannizzo (NASA/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 11:57:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 171007A (trigger=777215). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 135.544, +42.849, which is
```
   RA(J2000)   = 09h 02m 10s
   Dec(J2000) = +42d 50' 57"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks with a total duration of about 25 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 11:58:47.2 UT, 68.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 135.6006, 42.8195 which is equivalent to:
```
   RA(J2000)  = 09h 02m 24.15s
   Dec(J2000) = +42d 49' 10.3"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 183 arcseconds from the BAT onboard position, at the edge of 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 consistent with the Galactic value of 2.05 x 10^20 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 6.22e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:17:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 07"} (J2000)
POINT_ROLL:      117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43925.83 SOD {12:12:05.83} UT,   867.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.148
N_STARS:         55
X_OFFSET:        604 [pixels]
Y_OFFSET:        179 [pixels]
X_MAX:           2043 [pixels]
Y_MAX:           1618 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00777215000msufc0867.fits
SUN_POSTN:       193.28d {+12h 53m 07s}   -5.69d {-05d 41' 07"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.52d {+02h 26m 05s}   +9.34d {+09d 20' 07"}
MOON_DIST:        90.40 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:17:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 07"} (J2000)
POINT_ROLL:      117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43925.83 SOD {12:12:05.83} UT,   867.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.148
N_STARS:         55
X_OFFSET:        604 [pixels]
Y_OFFSET:        179 [pixels]
X_MAX:           2043 [pixels]
Y_MAX:           1618 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00777215000msufc0867.fits
SUN_POSTN:       193.28d {+12h 53m 07s}   -5.69d {-05d 41' 07"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.52d {+02h 26m 06s}   +9.34d {+09d 20' 08"}
MOON_DIST:        90.40 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 17 12:18:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 07"} (J2000)
ROLL:            117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43925.83 SOD {12:12:05.83} UT,   867.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     529071145
X_OFFSET:        1163 [pixels]
Y_OFFSET:        738 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1323
Y_GRB_POS:       898
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0887.fits
SUN_POSTN:       193.28d {+12h 53m 07s}   -5.69d {-05d 41' 08"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.54d {+02h 26m 08s}   +9.34d {+09d 20' 21"}
MOON_DIST:        90.39 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [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:     Sat 07 Oct 17 12:18:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     777215,   Seg_Num: 0
POINT_RA:        135.540d {+09h 02m 10s} (J2000)
POINT_DEC:       +42.852d {+42d 51' 07"} (J2000)
ROLL:            117.278d
IMG_START_DATE:  18033 TJD;   280 DOY;   17/10/07
IMG_START_TIME:  43925.83 SOD {12:12:05.83} UT,   867.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     529071145
X_OFFSET:        1163 [pixels]
Y_OFFSET:        738 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1323
Y_GRB_POS:       898
BINNING_INDEX:   1
IM_URL:          sw00777215000msuni0887.fits
SUN_POSTN:       193.28d {+12h 53m 07s}   -5.69d {-05d 41' 08"}
SUN_DIST:         70.99 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:       36.54d {+02h 26m 09s}   +9.34d {+09d 20' 24"}
MOON_DIST:        90.39 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.39, 41.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      125.20, 24.82 [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 #21977
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 171007A (Cannizzo, et al., GCN 21976) 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 2017/10 7.50 to 2017/10 7.52 UTC (3 minutes to 0.57 hours after the BAT trigger), obtaining a total of 0.31 hours exposure in the r and i bands and 0.14 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle, in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
 r > 22.05
 i > 21.94
 Z > 21.24
 Y > 21.02
 J > 20.65
 H > 20.34
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #21978
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester) and J.K. Cannizzo report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 171007A (Cannizzo et al. GCN Circ. 21976), from 62 s to 12.7 ks after the BAT trigger. The data comprise 107 s in Windowed Timing (WT) mode (the first 5 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 135.6008, 42.8193 which is equivalent to:
```
RA (J2000): 09 02 24.19
Dec(J2000): +42 49 09.5
```
with an uncertainty of 2.3 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay index of alpha=3.56 (+0.21, -0.18).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.38 (+0.19, -0.18). The best-fitting absorption column is 1.2 (+0.9, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 2.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     1.2 (+0.9, -0.7) x 10^21 cm^-2
Galactic foreground: 2.1 x 10^20 cm^-2
Excess significance: 2.4 sigma
Photon index:	     1.38 (+0.19, -0.18)
```
If the light curve continues to decay with a power-law decay index of 3.56, the count rate at T+24 hours will be 1.1 x 10^-10 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.2 x 10^-21 (5.7 x 10^-21) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00777215.
This circular is an official product of the Swift-XRT team.
GCN Circular #21979
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1637 s of XRT Photon Counting mode data and 2 UVOT images for GRB 171007A, 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 = 135.60048, +42.81920 which is equivalent to:
```
RA (J2000): 09h 02m 24.11s
Dec (J2000): +42d 49' 09.1"
```
with an uncertainty of 2.0 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 #21980
Elisabetta Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team:
"At 11:57:39.90 UT on 07 October 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 171007A (trigger 529070264 / 171007498), which was also detected by the Swift-BAT (Cannizzo et al. 2017, GCN 21976). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees.
The GBM light curve consists of single peak with a duration (T90) of about 3.5 s (50-300 keV). The time-averaged spectrum from T0-1.4 s to T0+2.1 s is adequately fit by a simple power law function with index -1.31 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is (6.1 +/- 0.7)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0-1 s in the 10-1000 keV band is 1.5 +/- 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 #21981
S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 171007A (trigger #777215) (Cannizzo et al., GCN Circ. 21976). The BAT ground-calculated position is RA, Dec = 135.635, 42.930 deg which is
```
  RA(J2000)  =  09h 02m 32.5s
  Dec(J2000) = +42d 55' 47.4"
```
with an uncertainty of 3.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a short spike that start at ~ T-0.1 s and ends at ~ T+2.9 s. There is some weak emission lasting till ~T+80 s. T90 (15-350 keV) is 105 +- 45 sec (estimated error including systematics).
The time-averaged spectrum from T-0.08 to T+107.92 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.52. The fluence in the 15-150 keV band is 2.9 +- 1.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.92 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Although the burst is weak and the short spike is ~ 3 s, the structure of the burst shows similarity to those of short GRBs with extended emission. We thus perform further analysis on the short spike and the tail emission. The spectrum of the short spike from T-0.08 to T+2.92 sec is best fit by a simple power-law model, with power-law index of 0.83 +- 0.35 and fluence (15-150 keV) of 1.0 +- 0.2 x 10^-7 erg/cm2. The spectrum of the tail emission from T+2.92 to T+107.92 sec is best fit by a simple power-law model, with power-law index of 1.67 +- 0.73 and fluence (15-150 keV) of 1.8 +- 1.0 x 10^-7 erg/cm2. These values are consistent with those of short GRBs with extended emission (Lien & Sakamoto et al. 2016).
The lag analysis is unconstrained due to the weakness of this burst.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/777215/BA/
GCN Circular #21984
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171007A 77 s after the BAT trigger (Cannizzo et al., GCN Circ. 21976). No optical afterglow consistent with the enhanced XRT position (Beardmore et al. GCN Circ. 21979) 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            77          227          147         >20.7
u_FC               291          540          246         >20.4
white               77         6966          805         >21.7
v                  620         7377          529         >19.5
b                  546         6761          510         >20.8
u                  291         6556          559         >20.7
w1                 669         6351          333         >20.3
m2                 644         7572          480         >19.9
w2                 596         7172          529         >20.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).

Back to JG's homepage

Jochen Greiner, last update: 10-Oct-2017 [Disclaimer]