Gamma-ray Burst 161017A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:52:16 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.765d {+09h 31m 04s} (J2000),
                 143.033d {+09h 32m 08s} (current),
                 141.965d {+09h 27m 52s} (1950)
GRB_DEC:         +43.142d {+43d 08' 30"} (J2000),
                 +43.067d {+43d 04' 02"} (current),
                 +43.362d {+43d 21' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4356 [cnts]    Image_Peak=230 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       24856 [cnts]
BKG_TIME:        64294.97 SOD {17:51:34.97} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17678 TJD;   291 DOY;   16/10/17
GRB_TIME:        64311.16 SOD {17:51:51.16} UT
GRB_PHI:         -20.00 [deg]
GRB_THETA:         8.71 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     19.54 [sigma]
IMAGE_SIGNIF:    8.53 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +0 -24  +0 
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 00"}
SUN_DIST:         75.70 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.59d {+03h 02m 21s}  +12.44d {+12d 26' 24"}
MOON_DIST:        86.87 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.63, 26.86 [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 = 247.52,9.69 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(17.0<100sec) coincident with the FERMI_GBM event (trignum=498419532).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:52:14 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     498419532
GRB_RA:          132.300d {+08h 49m 12s} (J2000),
                 132.571d {+08h 50m 17s} (current),
                 131.490d {+08h 45m 58s} (1950)
GRB_DEC:         +39.150d {+39d 08' 60"} (J2000),
                 +39.087d {+39d 05' 13"} (current),
                 +39.336d {+39d 20' 09"} (1950)
GRB_ERROR:       12.37 [deg radius, statistical plus systematic]
GRB_INTEN:       222 [cnts/sec]
DATA_SIGNIF:     9.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17678 TJD;   291 DOY;   16/10/17
GRB_TIME:        64328.26 SOD {17:52:08.26} UT
GRB_PHI:           7.00 [deg]
GRB_THETA:       130.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.52
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 00"}
SUN_DIST:         81.28 [deg]   Sun_angle= 4.7 [hr] (West of Sun)
MOON_POSTN:       45.59d {+03h 02m 21s}  +12.44d {+12d 26' 24"}
MOON_DIST:        79.88 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      183.05, 38.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.88, 20.55 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn161017745/quicklook/glg_lc_medres34_bn161017745.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 284.32,2.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:52:57 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     498419532
GRB_RA:          141.910d {+09h 27m 38s} (J2000),
                 142.178d {+09h 28m 43s} (current),
                 141.109d {+09h 24m 26s} (1950)
GRB_DEC:         +42.660d {+42d 39' 36"} (J2000),
                 +42.586d {+42d 35' 11"} (current),
                 +42.878d {+42d 52' 40"} (1950)
GRB_ERROR:       3.46 [deg radius, statistical only]
DATA_SIGNIF:     18.40 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        17678 TJD;   291 DOY;   16/10/17
GRB_TIME:        64328.26 SOD {17:52:08.26} UT
GRB_PHI:         359.00 [deg]
GRB_THETA:       125.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 00"}
SUN_DIST:         76.03 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:       45.60d {+03h 02m 23s}  +12.44d {+12d 26' 31"}
MOON_DIST:        86.37 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      178.48, 46.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.16, 26.19 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn161017745/quicklook/glg_lc_medres34_bn161017745.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_498419532.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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(17.0<100sec) coincident with the SWIFT_BAT event (trignum=718023).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:52:27 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     498419532
GRB_RA:          142.610d {+09h 30m 26s} (J2000),
                 142.875d {+09h 31m 30s} (current),
                 141.818d {+09h 27m 16s} (1950)
GRB_DEC:         +41.480d {+41d 28' 48"} (J2000),
                 +41.406d {+41d 24' 20"} (current),
                 +41.700d {+41d 42' 00"} (1950)
GRB_ERROR:       3.74 [deg radius, statistical only]
DATA_SIGNIF:     13.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17678 TJD;   291 DOY;   16/10/17
GRB_TIME:        64328.26 SOD {17:52:08.26} UT
GRB_PHI:           0.00 [deg]
GRB_THETA:       124.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 00"}
SUN_DIST:         75.02 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.59d {+03h 02m 22s}  +12.44d {+12d 26' 26"}
MOON_DIST:        87.16 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      180.14, 46.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.16, 25.26 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn161017745/quicklook/glg_lc_medres34_bn161017745.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_498419532.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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(17.0<100sec) coincident with the SWIFT_BAT event (trignum=718023).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:53:26 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.7681d {+09h 31m 04.34s} (J2000),
                 143.0361d {+09h 32m 08.65s} (current),
                 141.9677d {+09h 27m 52.25s} (1950)
GRB_DEC:         +43.1300d {+43d 07' 48.0"} (J2000),
                 +43.0554d {+43d 03' 19.5"} (current),
                 +43.3505d {+43d 21' 01.7"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.24e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.53 [sigma]
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64368.86 SOD {17:52:48.86} UT,   57.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.21 261.61 243.29
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 01"}
SUN_DIST:         75.69 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.60d {+03h 02m 24s}  +12.44d {+12d 26' 35"}
MOON_DIST:        86.86 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.73, 46.76 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.64, 26.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.71 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:53:45 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.7681d {+09h 31m 04.3s} (J2000),
                 143.0361d {+09h 32m 08.6s} (current),
                 141.9677d {+09h 27m 52.2s} (1950)
GRB_DEC:         +43.1300d {+43d 07' 48.0"} (J2000),
                 +43.0554d {+43d 03' 19.5"} (current),
                 +43.3505d {+43d 21' 01.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       111 [cnts]
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64368.86 SOD {17:52:48.86} UT,   57.7 [sec] since BAT Trigger Time
CENTROID_X:      284.02,  raw= 284  [pixels]
CENTROID_Y:      283.52,  raw= 284  [pixels]
ROLL:            118.10 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -33.64
GRB_POS_XRT_Z:   -50.15
IMAGE_URL:       sw00718023000msxps_rw.img
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 01"}
SUN_DIST:         75.69 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.60d {+03h 02m 25s}  +12.44d {+12d 26' 38"}
MOON_DIST:        86.86 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.73, 46.76 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.64, 26.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:53:40 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.7681d {+09h 31m 04.3s} (J2000),
                 143.0361d {+09h 32m 08.6s} (current),
                 141.9677d {+09h 27m 52.2s} (1950)
GRB_DEC:         +43.1300d {+43d 07' 48.0"} (J2000),
                 +43.0554d {+43d 03' 19.5"} (current),
                 +43.3505d {+43d 21' 01.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       111 [cnts]
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64368.86 SOD {17:52:48.86} UT,   57.7 [sec] since BAT Trigger Time
CENTROID_X:      284.02,  raw= 284  [pixels]
CENTROID_Y:      283.52,  raw= 284  [pixels]
ROLL:            118.10 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -33.64
GRB_POS_XRT_Z:   -50.15
IMAGE_URL:       sw00718023000msxps_rw.img
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 01"}
SUN_DIST:         75.69 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.60d {+03h 02m 25s}  +12.44d {+12d 26' 37"}
MOON_DIST:        86.86 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.73, 46.76 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.64, 26.85 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:55:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.765d {+09h 31m 04s} (J2000),
                 143.033d {+09h 32m 08s} (current),
                 141.965d {+09h 27m 52s} (1950)
GRB_DEC:         +43.142d {+43d 08' 30"} (J2000),
                 +43.067d {+43d 04' 02"} (current),
                 +43.362d {+43d 21' 44"} (1950)
GRB_DATE:        17678 TJD;   291 DOY;   16/10/17
GRB_TIME:        64311.16 SOD {17:51:51.16} UT
TRIGGER_INDEX:   146
GRB_PHI:         -20.00 [deg]
GRB_THETA:         8.71 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.54 [sigma]
IMAGE_SIGNIF:    8.53 [sigma]
LC_URL:          sw00718023000msb.lc
SUN_POSTN:       202.97d {+13h 31m 52s}   -9.60d {-09d 36' 03"}
SUN_DIST:         75.70 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.62d {+03h 02m 29s}  +12.45d {+12d 26' 54"}
MOON_DIST:        86.84 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.63, 26.86 [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 = 247.52,9.69 [deg].  
COMMENTS:        The 2nd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:56:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.758d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.144d {+43d 08' 39"} (J2000)
POINT_ROLL:      118.099d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64378.51 SOD {17:52:58.51} UT,   67.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.763
N_STARS:         24
X_OFFSET:        536 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1495 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00718023000msufc0067.fits
SUN_POSTN:       202.97d {+13h 31m 53s}   -9.60d {-09d 36' 04"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.64d {+03h 02m 33s}  +12.45d {+12d 27' 06"}
MOON_DIST:        86.82 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 17:57:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.758d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.144d {+43d 08' 39"} (J2000)
POINT_ROLL:      118.099d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64378.51 SOD {17:52:58.51} UT,   67.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.763
N_STARS:         24
X_OFFSET:        536 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1495 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00718023000msufc0067.fits
SUN_POSTN:       202.97d {+13h 31m 53s}   -9.60d {-09d 36' 04"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.64d {+03h 02m 34s}  +12.45d {+12d 27' 09"}
MOON_DIST:        86.82 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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:     Mon 17 Oct 16 17:58:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.758d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.144d {+43d 08' 39"} (J2000)
ROLL:            118.099d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64378.51 SOD {17:52:58.51} UT,   67.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     498419595
X_OFFSET:        928 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00718023000msuni0085.fits
SUN_POSTN:       202.97d {+13h 31m 53s}   -9.60d {-09d 36' 05"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.66d {+03h 02m 38s}  +12.46d {+12d 27' 23"}
MOON_DIST:        86.80 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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:     Mon 17 Oct 16 17:59:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.758d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.144d {+43d 08' 39"} (J2000)
ROLL:            118.099d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64378.51 SOD {17:52:58.51} UT,   67.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     498419595
X_OFFSET:        928 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00718023000msuni0085.fits
SUN_POSTN:       202.97d {+13h 31m 53s}   -9.60d {-09d 36' 06"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.66d {+03h 02m 38s}  +12.46d {+12d 27' 26"}
MOON_DIST:        86.80 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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 #20064
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB161017.74 70 sec after notice time and 96 sec after trigger time at 2016-10-17 17:53:27 UT. On our 3-th (20s exposure) set we found 1 optical transient within SWIFT error-box (ra=09 31 03 dec=+43 08 31 r=0.050000) brighter then 14.5.
```
 T-Tmid      Date      Time       Expt.        Ra                Dec         Mag
---------|---------------------|-------|-----------------|-----------------|-------
     106   2016-10-17 17:53:27      20   (  9h 31m 04.6s , +43d  7m 35.9s)   13.44
```
The 5-sigma upper limit has been about 14.5mag

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 18:03:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.757d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.147d {+43d 08' 48"} (J2000)
POINT_ROLL:      118.098d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64590.37 SOD {17:56:30.37} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.811
N_STARS:         13
X_OFFSET:        608 [pixels]
Y_OFFSET:        573 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1532 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00718023000msufc0279.fits
SUN_POSTN:       202.97d {+13h 31m 54s}   -9.60d {-09d 36' 10"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.71d {+03h 02m 50s}  +12.47d {+12d 28' 08"}
MOON_DIST:        86.75 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Oct 16 18:03:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.757d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.147d {+43d 08' 48"} (J2000)
POINT_ROLL:      118.098d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64590.37 SOD {17:56:30.37} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.811
N_STARS:         13
X_OFFSET:        608 [pixels]
Y_OFFSET:        573 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1532 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00718023000msufc0279.fits
SUN_POSTN:       202.97d {+13h 31m 54s}   -9.60d {-09d 36' 10"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.71d {+03h 02m 51s}  +12.47d {+12d 28' 12"}
MOON_DIST:        86.75 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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:     Mon 17 Oct 16 18:05:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.757d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.147d {+43d 08' 48"} (J2000)
ROLL:            118.098d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64590.37 SOD {17:56:30.37} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     498419807
X_OFFSET:        928 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00718023000msuni0297.fits
SUN_POSTN:       202.97d {+13h 31m 54s}   -9.60d {-09d 36' 11"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.72d {+03h 02m 53s}  +12.47d {+12d 28' 21"}
MOON_DIST:        86.74 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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:     Mon 17 Oct 16 18:05:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     718023,   Seg_Num: 0
POINT_RA:        142.757d {+09h 31m 02s} (J2000)
POINT_DEC:       +43.147d {+43d 08' 48"} (J2000)
ROLL:            118.098d
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64590.37 SOD {17:56:30.37} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     498419807
X_OFFSET:        928 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00718023000msuni0297.fits
SUN_POSTN:       202.97d {+13h 31m 54s}   -9.60d {-09d 36' 11"}
SUN_DIST:         75.71 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       45.73d {+03h 02m 54s}  +12.47d {+12d 28' 24"}
MOON_DIST:        86.74 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.71, 46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.62, 26.86 [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 #20064
E. Troja (NASA/GSFC/UMCP), D. N. Burrows (PSU), P. D'Avanzo (INAF-OAB), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), D. M. Palmer (LANL) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 17:51:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 161017A (trigger=718023). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 142.765, +43.142 which is
```
   RA(J2000) = 09h 31m 04s
   Dec(J2000) = +43d 08' 30"
```
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 160 sec. The peak count rate was ~2100 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 17:52:48.8 UT, 57.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 142.7681, 43.1300 which is equivalent to:
```
   RA(J2000)  = +09h 31m 4.34s
   Dec(J2000) = +43d 07' 48.0"
```
with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 43 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 3.24e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of nominal 150.000 seconds with the White filter starting 67 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at
```
  RA(J2000)  =	09:31:04.58 = 142.76910
  DEC(J2000) = +43:07:36.3  =  43.12675
```
with a 90%-confidence error radius of about 1.10 arc sec. This position is 12.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 13.86. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is E. Troja (eleonora.troja AT 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:     Mon 17 Oct 16 19:01:17 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     718023,   Seg_Num: 0
GRB_RA:          142.7691d {+09h 31m 04.58s} (J2000),
                 143.0370d {+09h 32m 08.89s} (current),
                 141.9687d {+09h 27m 52.49s} (1950)
GRB_DEC:         +43.1267d {+43d 07' 36.1"} (J2000),
                 +43.0521d {+43d 03' 07.6"} (current),
                 +43.3472d {+43d 20' 49.8"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         14.28 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  17678 TJD;   291 DOY;   16/10/17
IMG_START_TIME:  64376.00 SOD {17:52:56.00} UT,   64.8 [sec] since BAT Trigger Time
SUN_POSTN:       203.01d {+13h 32m 03s}   -9.62d {-09d 37' 02"}
SUN_DIST:         75.73 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:       46.31d {+03h 05m 14s}  +12.61d {+12d 36' 53"}
MOON_DIST:        86.24 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      177.73, 46.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.64, 26.84 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 11.9 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #20067
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 2929 s of XRT Photon Counting mode data and 6 UVOT images for GRB 161017A, 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 = 142.76888, +43.12633 which is equivalent to:
```
RA (J2000): 09h 31m 4.53s
Dec (J2000): +43d 07' 34.8"
```
with an uncertainty of 1.4 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 #20068
C. M. Hui (NASA/MSFC) and C Meegan (UAH) report on behalf of the Fermi GBM Team:
At 17:52:08.26 UT on 17 October 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 161017A (trigger 498419532/161017745), which was also detected by Swift (Troja et al., GCN 20064). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 125 degrees.
The GBM light curve shows two peaks with a duration (T90) of about 32 s (50-300 keV). The time-averaged spectrum from T0-22.1 s to T0+8.6 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 298.50 +/- 45.00 keV
The event fluence (10-1000 keV) in this time interval is (7.02 +/- 0.43)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.3 s in the 10-1000keV band is 5.6 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.
GCN Circular #20069
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. A. Kann (TLS Tautenburg), C. Thoene (IAA-CSIC), L. Izzo (IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), Z. Cano (IAA-CSIC), K. Bensch (IAA-CSIC), D. Garcia-Alvarez (IAC, ULL, GRANTECAN) and D. Perez Valladares (GRANTECAN) report :
We observed the afterglow of GRB 161017A (Yurkov et al., GCN 20063, Troja et al. GCN 20064) with OSIRIS at the 10.4m GTC telescope on La Palma (Spain). The observations started at 04:38:44 UT (10.78 hr after the burst) and consist of 3 x 900 s spectra using grism R1000B, which covers the spectral region between 3700 and 7800 AA at a resolution of R ~ 1000.
The r-band acquisition image shows the afterglow at a magnitude of r(AB) = 18.24+/-0.07, as compared to several SDSS stars.
The spectrum shows a strong continuum with weak features of SiII, CIV, AlII, and FeII at a common redshift of 2.013, which we identify as the redshift of the GRB. Additionally, we detect two intervening systems at z=0.916 and z=1.370, both with MgII features.

GCN Circular #20070
T.Fujiwara, Y.Saito, Y. Tachibana, T. Yoshii, Y. Yano, Y.Ono, S.Harita, Y.Muraki, K.Morita, T.Ozawa, K.Saisho,Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 161017A (E. Troja et al., GCN Circular #20064) 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 2016-10-17 17:52:42 UT (51 sec after the burst) and we detected the optical counterpart in g', Rc and Ic band. The measured magnitudes were listed as follows.
We obtained following results for the magnitudes.

T0+[sec]    MID-UT      T-EXP[sec]         g'              Rc                      Ic
-------------------------------------------------------------------------------------------------------
51            17:52:57        30          14.55 +/- 0.06        13.78 +/- 0.05      13.38 +/- 0.06
87            17:55:41        240         14.35 +/- 0.05        13.61 +/- 0.04      13.25 +/- 0.04
331          18:03:41        600         15.50 +/- 0.05        14.73 +/- 0.04      14.42 +/- 0.04
996          18:28:35        2100       16.58 +/- 0.05        15.89 +/- 0.05      15.63 +/- 0.04
3320        19:15:35        2040       16.76 +/- 0.06        16.03 +/- 0.05      15.77 +/- 0.05
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.

GCN Circular #20071
A. Melandri, P. D'Avanzo (INAF-OAB), V. D'Elia (INAF/OAR & ASI/ASDC), V. Lorenzi, Hristo Stoev (INAF-TNG) report on behalf of the CIBO collaboration:
We observed the field of GRB 161017A (Troja et al., GCN 20064) with the 3.6m Telescopio Nazionale Galileo (TNG) equipped with DOLoRes. Observations were carried out in the r-sdss filter. Observations started on Oct 18 at 03:51:18 UT (~10 hours after the burst) and consist in a single image lasting 120 seconds.
The optical afterglow (Yurkov et al. GCN 20063; Troja et al. GCN 20064; de Ugarte Postigo et al. GCN 20069; Fujiwara et al. GCN 20070) is detected with a magnitude r(AB) = 17.9 +/- 0.1 (calibrated against nearby SDSS stars).
GCN Circular #20072
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica) on behalf of a large collaboration report:
The 1-m LCOGT McDonald telescope began observing Swift GRB161017A (Troja et al., GCN 20064) in the SDSS r filter on October 18, 10:03 UT (~0.67 days since the GRB). We detect the optical afterglow (Yurkov et al. GCN 20063; Troja et al. GCN 20064; de Ugarte-Postigo et al. GCN 20069; Fujiwara et al GCN 20070; Melandri et al. GCN 20071) with r=18.95 +- 0.10 mag at 0.68 days mid epoch, as calibrated against nearby SDSS stars.
GCN Circular #20073
P.A. Evans (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 7.6 ks of XRT data for GRB 161017A (Troja et al. GCN Circ. 20064), from 51 s to 46.2 ks after the BAT trigger. The data comprise 595 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 enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 20067).
The late-time light curve (from T0+4.5 ks) can be modelled with a power-law decay with a decay index of alpha=1.04 (+/-0.06).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.656 (+/-0.019). The best-fitting absorption column is 7.5 (+/-0.7) x 10^21 cm^-2, at a redshift of 2.013, in addition to the Galactic value of 1.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.99 (+0.10, -0.07) and a best-fitting absorption column of 4 (+20, -4) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (3.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 1.8 x 10^20 cm^-2
Intrinsic column:    4 (+20, -4) x 10^20 cm^-2 at z=2.013
Photon index:	     1.99 (+0.10, -0.07)
```
If the light curve continues to decay with a power-law decay index of 1.04, the count rate at T+24 hours will be 0.042 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-12 (1.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00718023.
This circular is an official product of the Swift-XRT team.
GCN Circular #20074
A. A. Breeveld (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161017A 68 s after the BAT trigger (Troja et al., GCN Circ. 20064, Yurkov et=20 al., GCN Circ. 20063). The UVOT source described in Troja et al., GCN Circ. 20064, is at a=20 position consistent with the enhanced XRT position (Beardmore et al.,=20 GCN Circ. 20067) and is found to be fading.
The preliminary UVOT position is:
```
     RA  (J2000) =3D  09:31:04.60 =3D 142.76915 (deg.)
     Dec (J2000) =3D +43:07:36.3  =3D  43.12676 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early=20 exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white               68          217          147         14.08 =B1 0.02
v                  609          629           20         15.14 =B1 0.09
b                  535          555           20         15.60 =B1 0.06
u                  280          529          246         14.56 =B1 0.02
uvw1               658          661          2.7         15.5  =B1 0.3
```
The magnitudes in the table are not corrected for the Galactic=20 extinction due to the reddening of E(B-V) =3D 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #20076
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), 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), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+833 sec from the recent telemetry downlink, we report further analysis of BAT GRB 161017A (trigger #718023) (Troja, et al., GCN Circ. 20064). The BAT ground-calculated position is RA, Dec = 142.770, 43.125 deg which is
```
   RA(J2000)  =  09h 31m 04.8s
   Dec(J2000) = +43d 07' 29.0"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows two main episodes. The first multi-peak episode starts around T-5 sec, and ends at ~T+50 sec. The second relatively weaker episode starts at ~T+60 sec and ends around T+250 sec. T90 (15-350 keV) is 216.3 +- 6.9 sec (estimated error including systematics).
The time-averaged spectrum from T-4.88 to T+233.42 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.06. The fluence in the 15-150 keV band is 5.3 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+17.78 sec in the 15-150 keV band is 2.8 +- 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/718023/BA/
GCN Circular #20075
V.A.Sadovnichy, Lomonosov Moscow State University
M.I.Panasyuk, S.I.Svertilov, A.V.Bogomolov, V.V.Bogomolov, N.L.Dzhioeva, A.M.Amelushkin, V.O.Barinova, A.F.Iyudin, V.V.Kalegaev, D.Nguen, V.L. Petrov, I.V.Yashin, P.S.Kazarian Physics Department, Skobel`tsyn Institute of Nuclear Physics, Moscow State
V. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov, M.Panchenko, A.Kuznetsov, V.G.Kornilov, P. Balanutsa, E.Popova Lomonosov Moscow State University, Sternberg Astronomical Institute
V.Yurkov, A.Gabovich, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
N.M.Budnev, K.Ivanov, O.Gres, O.Chuvalaev, V.A.Poleshchuk, S.Yazev Irkutsk State University
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
I. Park, J. Lee, S. Jeong Department of Physics, Sungkyunkwan University, Seobu-ro, Jangangu, Suwonsi, Korea
At 17:52:17 UT on 17 Sep 2016, the Lomonosov BDRG Gamma-ray Burst Monitor (http://lomonosov.sinp.msu.ru/en/scientific-equipment-2/bdrg ) triggered GRB 161017A (E. Troja et al.,, GCN 20064). GRB 161017A has several peaks LC, total duration ~100s,the energy range 70-300 keV.
The light curve is available at http://master.sai.msu.ru/static/Lomonosov/GRB161017A_BDRG2.png
More information will be available at: http://lomonosov.sinp.msu.ru/category/results/observation-gamma-ray-bursts
MASTER-Amur robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB161017A 21 sec after notice time and 47 sec after Swift trigger time at 2016-10-17 17:52:38 UT in two polarizations. On our first (10s exposure) set we marginally found optical transient at Yurkov et al. (GCN 20063) and Troja et al. (GCN 20064) position. The 5-sigma upper limit has been about 14.5 mag . The OT was became brighter up to maximum at 3-4 set .
The observations made on zenit distance = 53 degrees, galaxy latitude b = 47 degree. The moon (96 % bright part) is 50 degrees above the horizon. The distance between moon and object is 87 The sun altitude is -37.8 degree.
MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka (Baykal lake) was pointed to the GRB161017.74 75 sec after notice time and 103 sec after trigger time at 2016-10-17 17:53:34 UT. On our second (20s exposure) set we haven`t found optical transient within SWIFT error-box (ra=09 31 03 dec=+43 08 31 r=0.050000). The 5-sigma upper limit has been about 12.5 mag.
The observations made on zenit distance = 65 degrees, galaxy latitude b = 47 degree. The moon (96 % bright part) is 50 degrees above the horizon. The distance between moon and object is 87 degrees. The sun altitude is -45.9 degrees. The low mahnitude limit because dense fog due to Irkut (Famost Sibirian river) evaporation.
We imaged OT late.
MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru) located at Teide Observatory (Tenerife, Canary, Spain) was pointed to the GRB161017A 32942 sec after trigger time at 2016-10-18 03:00:53 UT. On our first (180s exposure) set we found optical transient on coaded images. The 5-sigma upper limit has been about 17.8 mag
The observations made on zenit distance = 69 degrees, galaxy latitude b = 47 degrees. The moon (94 % bright part) is 75 degrees above the horizon. The distance between moon and object is 82 degrees. The sun altitude is -54.1 degree.
Our preliminary photometry is next:
```
Time     Tstart  Tmid Expt    Site      Filter  Mag   eMag Filter  Mag   eMag

17:52:38    47    52   10   MASTER-Amur   P/   15.69   1.0  P\   15.46   1.0
17:53:07    71    76   10   MASTER-Amur   P/   14.05   0.3  P\   13.99   0.3
17:53:03    96   106   20   MASTER-Amur   P/   13.87   0.2  P\   13.63   0.2
17:54:03   131   146   30   MASTER-Amur   P/   13.90   0.3  P\   13.80   0.3
17:54:46   175   195   40   MASTER-Amur   P/   14.34   0.3  P\   14.34   0.3
17:55:41   229   254   50   MASTER-Amur   P/   15.03   0.4  P\   
17:56:46   295   325   60   MASTER-Amur   P/   14.91   0.4  P\   14.91   0.4
17:58:12   381   540  240   MASTER-Amur   P/   15.88   0.4  P\   16.03   0.4
18:05:20   809   889  160   MASTER-Tunka  P|   15.64   0.2  
03:00:53 32942 33464  900   MASTER-IAC    C    18.62   0.2  
03:19:17 34046 34587  900   MASTER-IAC    C    18.60   0.2  
03:38:01 35170 35726  900   MASTER-IAC    C    18.62   0.2  
03:57:26 36335 36885  900   MASTER-IAC    C    18.68   0.2  
```
Preliminary OT light curve is available at http://master.sai.msu.ru/static/GRB161017A.png
GCN Circular #20077
A. J. Castro-Tirado (IAA-CSIC), A. F. Valeev (SAO-RAS), V. V. Sokolov (SAO-RAS), P. Ferrero (IAA-CSIC), J. C. Tello (IAA-CSIC), Y. Hu (IAA-CSIC), B.-B. Zhang (IAA-CSIC), S. Jeong (SKKU and IAA-CSIC), J. Cepa (IAC), S. R. Oates (U. of Warwick), D. Garcia-Alvarez (IAC, ULL, GRANTECAN), D. Perez Valladares (GRANTECAN), N. Castro-Rodriguez (GRANTECAN) and S. Fernandez (GRANTECAN) on behalf of a larger collaboration, report:
Following the detection of GRB 161017A by Swift (Troja et al. GCNC 20064), Fermi (Hui and Meegan, GCNC 20068) and Lomonosov (Sadovnichy et al. GCNC 20075), we observed the optical afterglow (Yurkov et al. GCNC 20063; Breeveld and Troja, GCNC 20074) with the 10.4m Gran Telescopio Canarias (GTC) at the Spanish island of La Palma, starting at 05:59 UT on Oct 18 (i.e. 12.1 hr post-burst), with both the R1000B and R2500I OSIRIS grisms, covering a combined range of 3800-10000 A. The reddest spectrum (convering the range between 7350 and 10000 A at a resolution of 2500) shows the strong Mg II doublet at a redshift z = 2.0127, consistent with the value reported by de Ugarte Postigo et al. (GCNC 20069). We also identify, in the bluest spectrum, other absorption lines (eg. SiII, FeII) and the two intervening systems reported on their GTC (+OSIRIS) R1000B spectrum taken 1.3 hr earlier than us.
We acknowledge excellent support from the GTC staff.
GCN Circular #20078
P. D'Avanzo (INAF-OAB), D. Malesani (DARK/NBI and DTU Space), V. D'Elia (INAF/OAR & ASI/ASDC), A. Melandri (INAF-OAB), V. Lorenzi, H. Stoev (INAF-TNG) report on behalf of the CIBO collaboration:
We observed the optical afterglow of GRB 161017A (Yurkov et al. GCN 20063; Troja et al. GCN 20064; de Ugarte Postigo et al. GCN 20069; Fujiwara et al. GCN 20070; Guidorzi et al. GCN 20072; Breeveld & Troja, GCN 20074; Sadovnichy et al. GCN 20075) with the 3.6m Telescopio Nazionale Galileo (TNG) equipped with the DOLoRes camera in spectroscopic mode. Observations were carried out with the LR-B filter, covering the range 3500-8000 AA. The observations consisted of two spectra, each one lasting 1200 s, carried out at a mean time of Oct 18.1852 UT (~10.58 hours after the burst).
The spectrum shows a clear continuum. We detect absorption features consistent with Li-alpha, Si II, C IV and Fe II lines at a common redshift of z = 2.01, together with MgII intervening systems at z=0.92 and z=1.37, in agreement with the results reported by de Ugarte Postigo et al. (GCN 20069) and Castro-Tirado et al. (GCN 20077).
GCN Circular #20079
A. Kaur (Clemson U.), G. Henson (ETSU), and D. H. Hartmann (Clemson U.)
report optical observations of GRB161017A discovered by Swift (Yurkov et al., GCN Circ. 20063;Troja et al., GCN Circ. 20064).
The UVOT source described in Troja et al., GCN Circ. 20064, is at a position consistent with the enhanced XRT position (Beardmore et al.,GCN Circ. 20067) and is fading (Breeveld & Troja, GCN Circ. 20074) at the preliminary UVOT position:
RA (J2000) = 09:31:04.60 = 142.76915 (deg.)
Dec (J2000) = +43:07:36.3 = 43.12676 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
We observed the field on 2016-10-18.17 UT centered at 09:31:4.65 +43:07:36.34 (J2000), imaging for 20 minutes in the Cousins R filter with the 1.0m JKT telescope (SARA-RM) located on La Palma, Canary Isles, Spain. We detect the fading source at an R magnitude of 17.606 +/- 0.017 using the Andor IkonL 2048 x 2048 CCD (11.6 x 11.6 arc min). The photometric standard GD71 was utilized for calibration.
SARA is described at http://saraobservatory.org
GCN Circular #20080
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), N.R. Tanvir (U. Leicester) on behalf of a large collaboration report:
The 2-m Liverpool Telescope observed Swift GRB161017A (Troja et al., GCN 20064) in the SDSS r and i filters on October 19, from 03:45 to 05:37 UT (mid time~1.45 days since the GRB). We clearly detect the optical afterglow (Yurkov et al. GCN 20063; Troja et al. GCN 20064; de Ugarte-Postigo et al. GCN 20069; Fujiwara et al GCN 20070; Melandri et al. GCN 20071) with the following values, as calibrated against nearby SDSS stars:
```
Mid Time      Exposure       Filter       Magnitude
(days)           (s)
-------------------------------------------------------
1.42            5x120         SDSS-R      20.02 +- 0.03
1.42            5x120         SDSS-I      19.80 +- 0.03
-------------------------------------------------------
```
Compared with our previous report (Guidorzi et al. GCN 20072), we estimate an average power-law decay index alpha~1.3 between 0.68 and 1.45 days post burst.
GCN Circular #20081
S. Schulze (Weizmann Institute), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), M. Bremer, E. Chapillon, J. M. Winters (IRAM) and S. Martin (JAO) report on behalf a larger collaboration:
We conducted millimetre observations of GRB 161017A (Troja et al. GCN 20064) with the NOrthern Extended Millimeter Array (NOEMA; Plateau de Bure, France) at 93 and 133 GHz. Observations started at 6:51 UT on October 19 (i.e. 1.54 day after the burst).
We detect the afterglow at both frequencies. A preliminary analysis of the 93 GHz data reveals a flux density of 1.50 +/- 0.06 mJy. Further observations are scheduled.
We encourage follow-up observations at all frequencies.
GCN Circular #20082
D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 161017A (Swift-BAT trigger #718023: Troja et al., GCN 20064, T0(BAT)=3D17:51:51 UT; Fermi-GBM observation: Hui & Meegan, GCN 20068; Lomonosov observation: Sadovnichy et al., GCN 20075) was detected by Konus-Wind in the waiting mode.
The light curve shows an emission pulse which starts ~10 s before the BAT trigger, peaks at ~T0(BAT)+7 s, and lasts till ~T0(BAT)+28 s.
The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB161017_T64311/
As observed by Konus-Wind, the burst had a fluence of (8.5 =B1 1.1)x10^-6 erg/cm2 and a 2.944-s peak energy flux, measured from ~T0(BAT)+7 s, of (8.7 =B1 0.2)x10^-7 erg/cm2 (both in the 20 - 10000 keV energy range).
Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)-10 s to T0(BAT)+28 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha =3D -1.25 =B1 0.16, and Ep =3D 289 =B1 73 keV.
Modeling the KW 3-channel spectrum near the peak count rate with the CPL model yields alpha =3D -1.17 =B1 0.20, and Ep =3D 404 =B1 136 keV.
Assuming the redshift z=3D2.013 (de Ugarte Postigo et al., GCN 20069) and a standard cosmology model with H_0 =3D 70 km/s/Mpc, Omega_M =3D 0.3, and Omega_Lambda =3D 0.7, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~8.3x10^52 erg, the peak luminosity L_iso is ~2.5x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~870 keV.
All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.
GCN Circular #20142
K. P. Mooley (Hintze Fellow, Oxford), T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 161017A (Troja et al., GCN 20064) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Oct 18.14, Oct 19.33, Oct 21.30 and Oct 25.31 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 20067), with 3sigma upper limits of 132 uJy, 84 uJy, 63 uJy and 78 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 07-Nov-2016 [Disclaimer]