Gamma-ray Burst 201017A

(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:     Sat 17 Oct 20 09:47:01 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1000613,   Seg_Num: 0
GRB_RA:           36.633d {+02h 26m 32s} (J2000),
                  37.061d {+02h 28m 15s} (current),
                  35.614d {+02h 22m 27s} (1950)
GRB_DEC:         +66.673d {+66d 40' 22"} (J2000),
                 +66.765d {+66d 45' 55"} (current),
                 +66.448d {+66d 26' 52"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5444 [cnts]    Image_Peak=173 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   266     E_range: 25-100 keV
BKG_INTEN:       51849 [cnts]
BKG_TIME:        35158.17 SOD {09:45:58.17} UT
BKG_DUR:         24 [sec]
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35191.26 SOD {09:46:31.26} UT
GRB_PHI:         170.34 [deg]
GRB_THETA:        41.90 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.92 [sigma]
IMAGE_SIGNIF:    7.33 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -3  +0  +1 +53  +0 
SUN_POSTN:       202.68d {+13h 30m 43s}   -9.49d {-09d 29' 18"}
SUN_DIST:        121.90 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.84d {+14h 07m 21s}   -8.82d {-08d 49' 14"}
MOON_DIST:       121.95 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       61.37, 48.46 [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 = 239.62,6.58 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=624620797).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:46:57 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     624620797
GRB_RA:            6.850d {+00h 27m 24s} (J2000),
                   7.128d {+00h 28m 31s} (current),
                   6.184d {+00h 24m 44s} (1950)
GRB_DEC:         +38.767d {+38d 46' 00"} (J2000),
                 +38.882d {+38d 52' 54"} (current),
                 +38.490d {+38d 29' 24"} (1950)
GRB_ERROR:       28.07 [deg radius, statistical plus systematic]
GRB_INTEN:       113 [cnts/sec]
DATA_SIGNIF:     6.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35192.63 SOD {09:46:32.63} UT
GRB_PHI:         162.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.16
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      52%  GRB
2nd_MOST_LIKELY:  46%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       202.68d {+13h 30m 43s}   -9.49d {-09d 29' 18"}
SUN_DIST:        147.48 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      211.84d {+14h 07m 21s}   -8.82d {-08d 49' 13"}
MOON_DIST:       142.66 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      117.81,-23.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       23.36, 32.51 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 271.00,25.48 [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 17 Oct 20 09:47:15 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     624620797
GRB_RA:           34.280d {+02h 17m 07s} (J2000),
                  34.665d {+02h 18m 39s} (current),
                  33.362d {+02h 13m 27s} (1950)
GRB_DEC:         +60.930d {+60d 55' 48"} (J2000),
                 +61.025d {+61d 01' 32"} (current),
                 +60.699d {+60d 41' 55"} (1950)
GRB_ERROR:       10.78 [deg radius, statistical only]
DATA_SIGNIF:     9.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35192.63 SOD {09:46:32.63} UT
GRB_PHI:         134.00 [deg]
GRB_THETA:        94.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       202.68d {+13h 30m 43s}   -9.49d {-09d 29' 18"}
SUN_DIST:        127.71 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      211.84d {+14h 07m 21s}   -8.82d {-08d 49' 17"}
MOON_DIST:       127.75 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      133.15, -0.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.16, 43.87 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_624620797.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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1000613).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:48:26 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     624620797
GRB_RA:           38.460d {+02h 33m 50s} (J2000),
                  38.853d {+02h 35m 25s} (current),
                  37.523d {+02h 30m 05s} (1950)
GRB_DEC:         +60.120d {+60d 07' 12"} (J2000),
                 +60.210d {+60d 12' 37"} (current),
                 +59.901d {+59d 54' 02"} (1950)
GRB_ERROR:       9.36 [deg radius, statistical only]
DATA_SIGNIF:     10.80 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35192.63 SOD {09:46:32.63} UT
GRB_PHI:         133.00 [deg]
GRB_THETA:        92.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       202.68d {+13h 30m 43s}   -9.49d {-09d 29' 19"}
SUN_DIST:        127.86 [deg]   Sun_angle= 10.9 [hr] (West of Sun)
MOON_POSTN:      211.85d {+14h 07m 24s}   -8.83d {-08d 49' 35"}
MOON_DIST:       128.35 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      135.36, -0.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       58.20, 42.24 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_624620797.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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1000613).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:55:56 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     624620797
GRB_RA:           21.740d {+01h 26m 58s} (J2000),
                  22.093d {+01h 28m 22s} (current),
                  20.898d {+01h 23m 35s} (1950)
GRB_DEC:         +63.510d {+63d 30' 36"} (J2000),
                 +63.617d {+63d 37' 03"} (current),
                 +63.251d {+63d 15' 02"} (1950)
GRB_ERROR:       7.27 [deg radius, statistical only]
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35192.63 SOD {09:46:32.63} UT
GRB_PHI:         136.00 [deg]
GRB_THETA:       100.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       202.69d {+13h 30m 45s}   -9.49d {-09d 29' 26"}
SUN_DIST:        125.87 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      211.93d {+14h 07m 42s}   -8.86d {-08d 51' 26"}
MOON_DIST:       124.79 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      126.88,  0.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       50.78, 49.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_locplot_all_bn201017407.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1000613).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:48:41 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.643d {+02h 26m 34s} (J2000)
POINT_DEC:       +66.683d {+66d 41' 01"} (J2000)
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35295.10 SOD {09:48:15.10} UT,   103.8 [sec] since BAT Trigger Time
COUNTS:          24    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      2
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Algorithm did not converge; too many iterations.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:50:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1000613,   Seg_Num: 0
GRB_RA:           36.633d {+02h 26m 32s} (J2000),
                  37.061d {+02h 28m 15s} (current),
                  35.614d {+02h 22m 27s} (1950)
GRB_DEC:         +66.673d {+66d 40' 22"} (J2000),
                 +66.765d {+66d 45' 55"} (current),
                 +66.448d {+66d 26' 52"} (1950)
GRB_DATE:        19139 TJD;   291 DOY;   20/10/17
GRB_TIME:        35191.26 SOD {09:46:31.26} UT
TRIGGER_INDEX:   266
GRB_PHI:         170.34 [deg]
GRB_THETA:        41.90 [deg]
DELTA_TIME:      51.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.92 [sigma]
IMAGE_SIGNIF:    7.33 [sigma]
LC_URL:          sw01000613000msb.lc
SUN_POSTN:       202.68d {+13h 30m 44s}   -9.49d {-09d 29' 21"}
SUN_DIST:        121.90 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.88d {+14h 07m 30s}   -8.84d {-08d 50' 12"}
MOON_DIST:       121.96 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       61.37, 48.46 [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 = 239.62,6.58 [deg].  
COMMENTS:        The 2nd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:51:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.644d {+02h 26m 34s} (J2000)
POINT_DEC:       +66.683d {+66d 41' 01"} (J2000)
POINT_ROLL:      16.304d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35297.54 SOD {09:48:17.54} UT,   106.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.067
N_STARS:         127
X_OFFSET:        394 [pixels]
Y_OFFSET:        572 [pixels]
X_MAX:           1353 [pixels]
Y_MAX:           1531 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01000613000msufc0106.fits
SUN_POSTN:       202.68d {+13h 30m 44s}   -9.49d {-09d 29' 22"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.88d {+14h 07m 32s}   -8.84d {-08d 50' 25"}
MOON_DIST:       121.96 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 15 Oct 20 22:54:10 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1000452,   Seg_Num: 0
GRB_RA:          354.343d {+23h 37m 22s} (J2000),
                 354.594d {+23h 38m 23s} (current),
                 353.741d {+23h 34m 58s} (1950)
GRB_DEC:         +53.393d {+53d 23' 36"} (J2000),
                 +53.508d {+53d 30' 30"} (current),
                 +53.116d {+53d 06' 59"} (1950)
GRB_DATE:        19137 TJD;   289 DOY;   20/10/15
GRB_TIME:        82213.22 SOD {22:50:13.22} UT
TRIGGER_INDEX:   139
GRB_PHI:         -86.30 [deg]
GRB_THETA:        32.23 [deg]
DELTA_TIME:      -63.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.32 [sigma]
IMAGE_SIGNIF:    6.85 [sigma]
LC_URL:          sw01000452000msb.lc
SUN_POSTN:       201.32d {+13h 25m 17s}   -8.96d {-08d 57' 24"}
SUN_DIST:        130.53 [deg]   Sun_angle= -10.2 [hr] (East of Sun)
MOON_POSTN:      191.58d {+12h 46m 20s}   +0.19d {+00d 11' 40"}
MOON_DIST:       124.47 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      111.91, -7.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       24.09, 49.45 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 69.70,1.40 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:53:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.644d {+02h 26m 34s} (J2000)
POINT_DEC:       +66.683d {+66d 41' 01"} (J2000)
ROLL:            16.304d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35297.54 SOD {09:48:17.54} UT,   106.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     624620923
X_OFFSET:        713 [pixels]
Y_OFFSET:        891 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       873
Y_GRB_POS:       1051
BINNING_INDEX:   1
IM_URL:          sw01000613000msuni0132.fits
SUN_POSTN:       202.68d {+13h 30m 44s}   -9.49d {-09d 29' 24"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.90d {+14h 07m 36s}   -8.85d {-08d 50' 48"}
MOON_DIST:       121.96 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [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 17 Oct 20 09:52:41 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1000613,   Seg_Num: 0
GRB_RA:           36.6188d {+02h 26m 28.51s} (J2000),
                  37.0466d {+02h 28m 11.17s} (current),
                  35.5998d {+02h 22m 23.94s} (1950)
GRB_DEC:         +66.6780d {+66d 40' 40.7"} (J2000),
                 +66.7707d {+66d 46' 14.3"} (current),
                 +66.4531d {+66d 27' 11.0"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35303.00 SOD {09:48:23.00} UT,   111.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       202.68d {+13h 30m 44s}   -9.49d {-09d 29' 23"}
SUN_DIST:        121.90 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.89d {+14h 07m 34s}   -8.84d {-08d 50' 38"}
MOON_DIST:       121.97 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.15,  5.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       61.36, 48.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 09:53:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.644d {+02h 26m 34s} (J2000)
POINT_DEC:       +66.683d {+66d 41' 01"} (J2000)
ROLL:            16.304d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35297.54 SOD {09:48:17.54} UT,   106.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     624620923
X_OFFSET:        713 [pixels]
Y_OFFSET:        891 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       873
Y_GRB_POS:       1051
BINNING_INDEX:   1
IM_URL:          sw01000613000msuni0132.fits
SUN_POSTN:       202.68d {+13h 30m 44s}   -9.49d {-09d 29' 24"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.90d {+14h 07m 36s}   -8.85d {-08d 50' 50"}
MOON_DIST:       121.96 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 15 Oct 20 23:46:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1000452,   Seg_Num: 0
POINT_RA:        354.270d {+23h 37m 05s} (J2000)
POINT_DEC:       +53.416d {+53d 24' 56"} (J2000)
POINT_ROLL:      323.810d
IMG_START_DATE:  19137 TJD;   289 DOY;   20/10/15
IMG_START_TIME:  85430.62 SOD {23:43:50.62} UT,   3217.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.327
N_STARS:         190
X_OFFSET:        254 [pixels]
Y_OFFSET:        843 [pixels]
X_MAX:           1213 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw01000452000msufc3217.fits
SUN_POSTN:       201.36d {+13h 25m 26s}   -8.97d {-08d 58' 12"}
SUN_DIST:        130.49 [deg]   Sun_angle= -10.2 [hr] (East of Sun)
MOON_POSTN:      192.09d {+12h 48m 21s}   -0.04d {-00d 02' 13"}
MOON_DIST:       124.55 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      111.87, -7.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       24.06, 49.50 [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 17 Oct 20 10:00:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.649d {+02h 26m 36s} (J2000)
POINT_DEC:       +66.683d {+66d 40' 57"} (J2000)
ROLL:            16.309d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35455.57 SOD {09:50:55.57} UT,   264.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     624621081
X_OFFSET:        713 [pixels]
Y_OFFSET:        891 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       873
Y_GRB_POS:       1051
BINNING_INDEX:   1
IM_URL:          sw01000613000msuni0290.fits
SUN_POSTN:       202.69d {+13h 30m 45s}   -9.49d {-09d 29' 30"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.97d {+14h 07m 53s}   -8.88d {-08d 52' 38"}
MOON_DIST:       122.00 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [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 17 Oct 20 09:59:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.649d {+02h 26m 36s} (J2000)
POINT_DEC:       +66.683d {+66d 40' 57"} (J2000)
POINT_ROLL:      16.309d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35455.57 SOD {09:50:55.57} UT,   264.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.525
N_STARS:         93
X_OFFSET:        154 [pixels]
Y_OFFSET:        332 [pixels]
X_MAX:           1593 [pixels]
Y_MAX:           1771 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01000613000msufc0264.fits
SUN_POSTN:       202.69d {+13h 30m 45s}   -9.49d {-09d 29' 30"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.97d {+14h 07m 52s}   -8.87d {-08d 52' 27"}
MOON_DIST:       121.99 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [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 17 Oct 20 10:00:08 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1000613,   Seg_Num: 0
GRB_RA:           36.6186d {+02h 26m 28.46s} (J2000),
                  37.0464d {+02h 28m 11.12s} (current),
                  35.5996d {+02h 22m 23.89s} (1950)
GRB_DEC:         +66.6787d {+66d 40' 43.3"} (J2000),
                 +66.7714d {+66d 46' 16.8"} (current),
                 +66.4538d {+66d 27' 13.5"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35303.00 SOD {09:48:23.00} UT,   111.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       202.69d {+13h 30m 45s}   -9.49d {-09d 29' 30"}
SUN_DIST:        121.90 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.97d {+14h 07m 52s}   -8.87d {-08d 52' 29"}
MOON_DIST:       122.00 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.15,  5.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       61.36, 48.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 17 Oct 20 10:00:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1000613,   Seg_Num: 0
POINT_RA:         36.649d {+02h 26m 36s} (J2000)
POINT_DEC:       +66.683d {+66d 40' 57"} (J2000)
ROLL:            16.309d
IMG_START_DATE:  19139 TJD;   291 DOY;   20/10/17
IMG_START_TIME:  35455.57 SOD {09:50:55.57} UT,   264.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     624621081
X_OFFSET:        713 [pixels]
Y_OFFSET:        891 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       873
Y_GRB_POS:       1051
BINNING_INDEX:   1
IM_URL:          sw01000613000msuni0290.fits
SUN_POSTN:       202.69d {+13h 30m 45s}   -9.49d {-09d 29' 30"}
SUN_DIST:        121.89 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      211.97d {+14h 07m 54s}   -8.88d {-08d 52' 41"}
MOON_DIST:       122.00 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      132.16,  5.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       61.38, 48.47 [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 #28665
The Fermi GBM team reports the detection of a likely LONG GRB
At 09:46:32 UT on 17 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201017A (trigger 624620797.629664 / 201017407).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 21.7, Dec = 63.5 (J2000 degrees, equivalent to J2000 01h 26m, 63d 30'), with a statistical uncertainty of 7.3 degrees.
The angle from the Fermi LAT boresight is 100.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_skymap_all_bn201017407.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_healpix_all_bn201017407.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
GCN Circular #28666
A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC), J.D. Gropp (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), T. Sakamoto (AGU) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 09:46:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201017A (trigger=1000613). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 36.633, +66.673 which is
```
   RA(J2000) = 02h 26m 32s
   Dec(J2000) = +66d 40' 22"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 10 sec. Data from ~T+10 s to ~T+100 s are currently unavailable. There might be additional burst emission during this interval. The peak count rate was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 09:48:15.1 UT, 103.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 36.6186, 66.6787 which is equivalent to:
```
   RA(J2000)  = 02h 26m 28.45s
   Dec(J2000) = +66d 40' 43.4"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 29 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://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 5.70 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 106 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 1.20.
Burst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.it). 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/)
GCN Circular #28667
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 201017A ( A. D'Ai et al., GCN 28666) errorbox 7302 sec after notice time and 7410 sec after trigger time at 2020-10-17 11:50:02 UT, with upper limit up to 19.1 mag. Observations started at twilight. The observations began at zenith distance = 44 deg. The sun altitude is -16.4 deg.
The galactic latitude b = 6 deg., longitude l = 132 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1463193
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7501 |        MASTER-Tunka |   C |   180 | 19.1 |        
Filter C is a clear (unfiltred) band. 
```
The observation and reduction will continue. The message may be cited.

GCN Circular #28670

TITLE:   GCN CIRCULAR
NUMBER:  28670
SUBJECT: GRB 201017A: Xinglong TNT upper limit
DATE:    20/10/17 13:56:51 GMT
FROM:    Liping Xin at NAOC, SVOM  

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GCN Circular #28671
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1488 s of XRT Photon Counting mode data and 3 UVOT images for GRB 201017A, 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 = 36.62010, +66.67877 which is equivalent to:
```
RA (J2000): 02h 26m 28.82s
Dec (J2000): +66d 40' 43.6"
```
with an uncertainty of 2.6 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 #28672
L. P. Xin (NAOC), X. F. Wang(THU), Y. L. Qiu(NAOC), J. Y. Wei(NAOC), J. Wang(GXU), L. H. Li (NAOC), C. Wu(NAOC), E. W. Liang(GXU), X. H. Han (NAOC)and J. S. Deng(NAOC)report:
We began to observe GRB 201017A ( A. D'Ai et al., GCN 28666) with Xinglong TNT telescope, China, at 11:10:24.8 (UT), 17th. Otc. 2020, about 84 min after the burst,
10 x 300 sec R band images were obtained. No any new source was detected in the XRT errorbox ( A. D'Ai et al., GCN 28666) down to the limit magnitude of 19.5 mag in R band for any single image. The brightness is calibrated to the USNO B1.0 R2 mag.
More analysis are still continuing.
We acknowledge the excellent support from Xinglong staff Sen Liu.
The message may be cited.
GCN Circular #28675
S. Poolakkil (UAH), C. Meegan (UAH) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team:
"At 09:46:32.63 UT on 17 October 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 201017A(trigger 624620797 / 201017407), which was also detected by the Swift/BAT (A. D'Ai et al. 2020, GCN 28666). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 98 degrees.
The GBM light curve consists of a single peak followed by some extended emission with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-4.09 s to T0+5.12 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.20 +/- 0.17 and the cutoff energy, parameterized as Epeak, is 144 +/- 35 keV.
The event fluence (10-1000 keV) in this time interval is (1.402 +/- 0.166)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.89 s in the 10-1000 keV band is 2.9 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #28678
J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and A. D'Ai report on behalf of the Swift-XRT team:
We have analysed 3.5 ks of XRT data for GRB 201017A (D'Ai et al. GCN Circ. 28666), from 112 s to 23.0 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 28671).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.97 (+0.10, -0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+0.5, -0.4). The best-fitting absorption column is 1.6 (+0.6, -0.5) x 10^22 cm^-2, in excess of the Galactic value of 5.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+0.6, -0.5) x 10^22 cm^-2
Galactic foreground: 5.7 x 10^21 cm^-2
Excess significance: 3.6 sigma
Photon index:	     2.3 (+0.5, -0.4)
```
If the light curve continues to decay with a power-law decay index of 0.97, the count rate at T+24 hours will be 1.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.3 x 10^-14 (2.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01000613.
This circular is an official product of the Swift-XRT team.
GCN Circular #28679
S. Belkin (IKI), V. Kim (AFIF, Pulkovo Observatory), A. Pozanenko (IKI), E. Klunko (ISTP), M. Krugov (AFIF), N. Pankov (HSE), A. Volnova (IKI) report on behalf of IKI GRB FuN:
We observed the filed of GRB 201017A (Fermi GBM Team, GCN 28665; D'Ai et al., GCN 28666; Poolakkil et al., GCN 28675) with AZT-33IK telescope of Mondy observatory in R-filter starting on Oct. 17 (UT) 14:56:22 and with AZT-20 telescope of Assy-Turgen observatory starting on Oct. 17 (UT) 14:15:45 in r' -filter. At the edge of enhanced Swift-XRT position (Goad et al., GCN 28671) we marginally detected the object which is absent in any Pan-STARRS images and PS1 catalog. Position of the object is (J2000) 02:26:28.31 +66:40:44.74 with uncertainty of 0.5" in each coordinate.
Preliminary photometry of the afterglow candidate is following
```
Date       UT start  t-T0     Filter  Exp.    OT   Err.   UL (3sigma)
                      (mid, days)        (s)

2020-10-17 14:15:45  0.2043    r'(AB) 50*60   22.9 0.3   23.2 (AZT-20)
2020-10-17 14:56:22  0.2362    R      30*120  n/d  n/d   21.8 (AZT-33IK)
```
The photometry is based on the nearby stars of PanSTARRS-PS1 catalog.
```
RA DEC r
02:26:33.94915 +66:39:38.3372 16.1111
02:26:39.68479 +66:38:36.3089 17.4493
```
GCN Circular #28682
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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+823 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201017A (trigger #1000613) D'Ai, et al., GCN Circ. 28666). The BAT ground-calculated position is RA, Dec = 36.587, 66.663 deg which is
```
  RA(J2000)  =  02h 26m 20.9s 
  Dec(J2000) = +66d 39' 45.7" 
```
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted light curve shows a single, symmetrical main peak from roughly T-5 sec to T+5 sec, peaking at T+1 sec, followed by weaker emission out to T+20 sec. T90 (15-350 keV) is 22.08 +- 6.25 sec (estimated error including systematics).
The time-averaged spectrum from T-2.77 to T+23.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.25. The fluence in the 15-150 keV band is 9.0 +- 1.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.87 sec in the 15-150 keV band is 1.8 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1000613/BA/
GCN Circular #28684
R. Hosokawa, K. L. Murata, R. Adachi, M. Niwano, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 201017A (The Fermi GBM team, GCN #28665, A. D'Ai et al., GCN #28666, V. Lipunov et al., GCN #28667, L. P. Xin et al., GCN #28672, S. Belkin et al., GCN #28679) 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 at 2020-10-17 12:53:15 UT.(186 min after trigger) Since some images were heavily affected by bad weather, we stacked the images with good conditions. We did not find any new point sources within the enhanced Swift/XRT circle (M. R. Goad et al., GCN #28671) in all three bands. We obtained the 5-sigma limits as follows
```
T0+[min] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
296 17:53:37 9480 g'>20.0,Rc>19.9,Ic>19.2
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., accepted for publication in PASJ, https://arxiv.org/abs/2008.11486; https://github.com/MNiwano/Eclaire).
GCN Circular #28691
H. Kumar (IITB), U. Stanzin(IAO), V. Bhalerao(IITB), G. C. Anupama(IIA), S. Barway(IIA), report on behalf of the GROWTH-India collaboration:
We observed GRB 201017A reported by Fermi GBM Team (GCN #28665) and Swift-BAT (A. D'Ai et al., GCN #28666; also see:- V. Lipunov et al., GCN #28667; M.R. Goad et al., GCN #28671; L. P. Xin et al., GCN #28672; S. Poolakkil et al., GCN #28675; J.A. Kennea et al., GCN #28678; S. Belkin et al., GCN #28679) with 0.7m GROWTH-India telescope. The field was observed in the SDSS r’ filter starting at 2020-10-17T12:54:58.41 UT i.e. ~3.13 hrs after the event detection by Swift-BAT. We did not find any new source in the stacked image of 10*300 sec exposure, within an uncertainty region of 2.6 arcsec around RA (J2000): 02h 26m 28.82s, Dec (J2000): +66d 40' 43.6" (GCN 28671) up to r’ > 21.01 mag (5-sigma), calibrated against PanSTARRs PS1 data release, (Flewelling et al., 2018). Assuming a typical power-law decay, this upper limit is consistent with the r’=22.9 mag detection by Belkin et al (GCN # 28679).
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
GCN Circular #28692
A. S. Moskvitin, V. N. Aitov (SAO RAS) on behalf of GRB follow-up team report.
We observed the field of GRB 201017A (Fermi GBM team, GCN #28665; D'Ai et al., GCN #28666; Poolakkil et al., GCN #28675) with the 1-m telescope of SAO RAS, Zeiss-1000 + Multi-Mode Photometer-Polarimeter. We obtained 11 x 300 sec. images in Rc band on October 17, 22:01:08--23:24:20 UT, t_mid - T0 = 0.5390 days.
We did not detect possible OT reported by Belkin et al. (GCN #28679) or any sources within the XRT error circle (Goad et al., GCN #28671) down to a limiting magnitude of 23.0.
GCN Circular #28693
K. Hasuda, M. Nakamura, T. Sakamoto (AGU)
We observed the field of GRB 201017A detected by Swift (D'Ai et al., GCN Circ. 28666) with the iTelescope.Net (http://www.itelescope.net) T5 (Takahashi Epsilon 250mm) telescope located at the New Mexico Skies Observatory (NM, USA). 10 images of 60 sec exposures were taken in the Red filter starting from October 17 on 10:06:37 (UT) about 20.1 min. after the trigger and stopped on 10:20:44 (UT).
We do not detect the optical afterglow both in the individual images and the stacked image at the XRT position (Goad et al., GCN Circ. 28671). The estimated five sigma upper limit of the combined image (total exposure of 600 sec) is ~17.3 using the USNO-B1 catalog.

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Jochen Greiner, last update: 20-Oct-2020 [Disclaimer]