Gamma-ray Burst 181020A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:00:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     867987,   Seg_Num: 0
GRB_RA:           13.967d {+00h 55m 52s} (J2000),
                  14.180d {+00h 56m 43s} (current),
                  13.398d {+00h 53m 36s} (1950)
GRB_DEC:         -47.380d {-47d 22' 47"} (J2000),
                 -47.278d {-47d 16' 41"} (current),
                 -47.650d {-47d 39' 00"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       772 [cnts]    Image_Peak=82 [image_cnts]
TRIGGER_DUR:     0.128 [sec] 
TRIGGER_INDEX:   122     E_range: 25-100 keV
BKG_INTEN:       17647 [cnts]
BKG_TIME:        68418.21 SOD {19:00:18.21} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.51 SOD {19:00:33.51} UT
GRB_PHI:          64.63 [deg]
GRB_THETA:        12.14 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     28.93 [sigma]
IMAGE_SIGNIF:    8.26 [sigma]
MERIT_PARAMS:     +1  +0  +0  -3  +2  -1  +0  +0 +51  +0 
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 25"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 20s}  -10.18d {-10d 10' 44"}
MOON_DIST:        44.96 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.77,-69.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      347.74,-47.74 [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 = 52.72,18.47 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=561754838).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:00:57 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     561754838
GRB_RA:            7.533d {+00h 30m 08s} (J2000),
                   7.761d {+00h 31m 03s} (current),
                   6.927d {+00h 27m 43s} (1950)
GRB_DEC:         -44.317d {-44d 19' 00"} (J2000),
                 -44.213d {-44d 12' 46"} (current),
                 -44.593d {-44d 35' 33"} (1950)
GRB_ERROR:       6.92 [deg radius, statistical plus systematic]
GRB_INTEN:       426 [cnts/sec]
DATA_SIGNIF:     20.70 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         217.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.74
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   6%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,1,0, 0,0,1, 0,0,
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 25"}
SUN_DIST:        122.98 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 21s}  -10.18d {-10d 10' 43"}
MOON_DIST:        39.71 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      315.54,-72.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      344.87,-42.71 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 189.77,-22.42 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=867987).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:01:11 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     561754838
GRB_RA:           13.650d {+00h 54m 36s} (J2000),
                  13.868d {+00h 55m 28s} (current),
                  13.068d {+00h 52m 16s} (1950)
GRB_DEC:         -42.400d {-42d 23' 59"} (J2000),
                 -42.298d {-42d 17' 53"} (current),
                 -42.671d {-42d 40' 14"} (1950)
GRB_ERROR:       3.59 [deg radius, statistical only]
DATA_SIGNIF:     51.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         211.00 [deg]
GRB_THETA:        55.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 25"}
SUN_DIST:        126.13 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 21s}  -10.18d {-10d 10' 41"}
MOON_DIST:        41.34 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.72,-74.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      351.42,-43.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_561754838.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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(0.0<100sec) coincident with the SWIFT_BAT event (trignum=867987).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:01:10 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     561754838
GRB_RA:            7.533d {+00h 30m 08s} (J2000),
                   7.754d {+00h 31m 01s} (current),
                   6.944d {+00h 27m 47s} (1950)
GRB_DEC:         -55.483d {-55d 28' 59"} (J2000),
                 -55.380d {-55d 22' 45"} (current),
                 -55.759d {-55d 45' 33"} (1950)
GRB_ERROR:       4.48 [deg radius, statistical plus systematic]
GRB_INTEN:       820 [cnts/sec]
DATA_SIGNIF:     84.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         223.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  GRB
2nd_MOST_LIKELY:   6%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,1,0, 0,0,1, 0,0,
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 25"}
SUN_DIST:        112.46 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 21s}  -10.18d {-10d 10' 41"}
MOON_DIST:        48.88 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      309.24,-61.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      335.20,-51.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 189.77,-22.42 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=867987).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:01:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     561754838
GRB_RA:           15.080d {+01h 00m 19s} (J2000),
                  15.292d {+01h 01m 10s} (current),
                  14.514d {+00h 58m 03s} (1950)
GRB_DEC:         -46.280d {-46d 16' 47"} (J2000),
                 -46.179d {-46d 10' 43"} (current),
                 -46.549d {-46d 32' 56"} (1950)
GRB_ERROR:       2.54 [deg radius, statistical only]
DATA_SIGNIF:     34.00 [sigma]
DATA_INTERVAL:   3.072 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         212.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        122.58 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 22s}  -10.18d {-10d 10' 36"}
MOON_DIST:        44.73 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      298.27,-70.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      349.60,-47.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_561754838.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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 INTEGRAL_SPIACS event (trignum=8146).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:01:55 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     561754838
GRB_RA:           17.050d {+01h 08m 12s} (J2000),
                  17.259d {+01h 09m 02s} (current),
                  16.492d {+01h 05m 58s} (1950)
GRB_DEC:         -45.640d {-45d 38' 23"} (J2000),
                 -45.540d {-45d 32' 23"} (current),
                 -45.907d {-45d 54' 23"} (1950)
GRB_ERROR:       2.07 [deg radius, statistical only]
DATA_SIGNIF:     61.60 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         210.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        123.46 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 22s}  -10.18d {-10d 10' 33"}
MOON_DIST:        45.32 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      293.81,-71.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      351.80,-47.52 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_561754838.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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 INTEGRAL_SPIACS event (trignum=8146).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:01:59 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     561754838
GRB_RA:           12.650d {+00h 50m 36s} (J2000),
                  12.870d {+00h 51m 29s} (current),
                  12.065d {+00h 48m 16s} (1950)
GRB_DEC:         -42.720d {-42d 43' 11"} (J2000),
                 -42.618d {-42d 37' 03"} (current),
                 -42.992d {-42d 59' 30"} (1950)
GRB_ERROR:       1.55 [deg radius, statistical only]
DATA_SIGNIF:     82.10 [sigma]
DATA_INTERVAL:   8.192 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         212.00 [deg]
GRB_THETA:        55.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        125.64 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 23s}  -10.18d {-10d 10' 33"}
MOON_DIST:        41.02 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      303.50,-74.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      350.32,-43.35 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_561754838.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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 INTEGRAL_SPIACS event (trignum=8146).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 20 Oct 18 19:01:40 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8146,   Sub_Num: 0
GRB_INTEN:      9.56 [sigma]   
GRB_TIME:       68432.18 SOD {19:00:32.18} UT
GRB_DATE:       18411 TJD;   293 DOY;   18/10/20
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=561754838).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:
                ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2018-10/2018-10-20T19-00-32.0974-17161-60304-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:02:24 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      5
TRIGGER_NUM:     561754838
GRB_RA:           18.900d {+01h 15m 36s} (J2000),
                  19.102d {+01h 16m 25s} (current),
                  18.360d {+01h 13m 27s} (1950)
GRB_DEC:         -48.490d {-48d 29' 23"} (J2000),
                 -48.391d {-48d 23' 27"} (current),
                 -48.754d {-48d 45' 13"} (1950)
GRB_ERROR:       1.54 [deg radius, statistical only]
DATA_SIGNIF:     98.10 [sigma]
DATA_INTERVAL:   18.432 [sec]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         210.00 [deg]
GRB_THETA:        48.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        120.82 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      344.10d {+22h 56m 23s}  -10.17d {-10d 10' 29"}
MOON_DIST:        48.13 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      292.14,-68.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      350.86,-50.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_561754838.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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 INTEGRAL_SPIACS event (trignum=8146).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:09:49 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     561754838
GRB_RA:           18.510d {+01h 14m 02s} (J2000),
                  18.716d {+01h 14m 52s} (current),
                  17.962d {+01h 11m 51s} (1950)
GRB_DEC:         -46.440d {-46d 26' 23"} (J2000),
                 -46.341d {-46d 20' 26"} (current),
                 -46.704d {-46d 42' 15"} (1950)
GRB_ERROR:       3.27 [deg radius, statistical only]
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.30 SOD {19:00:33.30} UT
GRB_PHI:         209.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       205.38d {+13h 41m 32s}  -10.53d {-10d 31' 33"}
SUN_DIST:        122.82 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      344.16d {+22h 56m 38s}  -10.15d {-10d 09' 16"}
MOON_DIST:        46.59 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      291.39,-70.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.37,-48.75 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_lc_medres34_bn181020792.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn181020792/quicklook/glg_locplot_all_bn181020792.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:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8146).

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Sat 20 Oct 18 19:02:08 UT 
NOTICE_TYPE:     Swift-XRT Processed Image 
TRIGGER_NUM:     867987,   Seg_Num: 0 
GRB_RA:           13.9837d {+00h 55m 56.0s} (J2000), 
                  14.1970d {+00h 56m 47.2s} (current), 
                  13.4152d {+00h 53m 39.6s} (1950) 
GRB_DEC:         -47.3796d {-47d 22' 46.5"} (J2000), 
                 -47.2781d {-47d 16' 41.0"} (current), 
                 -47.6501d {-47d 39' 00.3"} (1950) 
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic] 
GRB_INTEN:       165 [cnts] 
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20 
IMG_START_TIME:  68489.07 SOD {19:01:29.07} UT,   55.6 [sec] since BAT Trigger Time 
CENTROID_X:      324.29,  raw= 324  [pixels] 
CENTROID_Y:      300.26,  raw= 300  [pixels] 
ROLL:            193.14 [deg] 
GAIN:            2 
MODE:            3, Long Image mode 
WAVEFORM:        134 
EXPO_TIME:       2.50 [sec] 
GRB_POS_XRT_Y:   4.38 
GRB_POS_XRT_Z:   42.19 
IMAGE_URL:       sw00867987000msxps_rw.img 
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun) 
MOON_POSTN:      344.10d {+22h 56m 23s}  -10.18d {-10d 10' 31"} 
MOON_DIST:        44.97 [deg] 
MOON_ILLUM:      85 [%] 
GAL_COORDS:      300.73,-69.73 [deg] galactic lon,lat of the burst 
ECL_COORDS:      347.76,-47.75 [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:     Sat 20 Oct 18 19:02:07 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     867987,   Seg_Num: 0
GRB_RA:           13.9837d {+00h 55m 56.0s} (J2000),
                  14.1970d {+00h 56m 47.2s} (current),
                  13.4152d {+00h 53m 39.6s} (1950)
GRB_DEC:         -47.3796d {-47d 22' 46.5"} (J2000),
                 -47.2781d {-47d 16' 41.0"} (current),
                 -47.6501d {-47d 39' 00.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       165 [cnts]
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68489.07 SOD {19:01:29.07} UT,   55.6 [sec] since BAT Trigger Time
CENTROID_X:      324.29,  raw= 324  [pixels]
CENTROID_Y:      300.26,  raw= 300  [pixels]
ROLL:            193.14 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   4.38
GRB_POS_XRT_Z:   42.19
IMAGE_URL:       sw00867987000msxps_rw.img
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.10d {+22h 56m 23s}  -10.18d {-10d 10' 31"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.73,-69.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      347.76,-47.75 [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:     Sat 20 Oct 18 19:01:58 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     867987,   Seg_Num: 0
GRB_RA:           13.9837d {+00h 55m 56.08s} (J2000),
                  14.1970d {+00h 56m 47.27s} (current),
                  13.4152d {+00h 53m 39.64s} (1950)
GRB_DEC:         -47.3796d {-47d 22' 46.5"} (J2000),
                 -47.2781d {-47d 16' 41.0"} (current),
                 -47.6501d {-47d 39' 00.3"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.04e-09 [erg/cm2/sec]
GRB_SIGNIF:      12.84 [sigma]
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68489.07 SOD {19:01:29.07} UT,   55.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.20 261.62 243.69
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       205.38d {+13h 41m 30s}  -10.52d {-10d 31' 26"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.09d {+22h 56m 23s}  -10.18d {-10d 10' 33"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.73,-69.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      347.76,-47.75 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.67 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:     Sat 20 Oct 18 19:04:58 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     867987,   Seg_Num: 0
GRB_RA:           13.967d {+00h 55m 52s} (J2000),
                  14.180d {+00h 56m 43s} (current),
                  13.398d {+00h 53m 36s} (1950)
GRB_DEC:         -47.380d {-47d 22' 47"} (J2000),
                 -47.278d {-47d 16' 41"} (current),
                 -47.650d {-47d 39' 00"} (1950)
GRB_DATE:        18411 TJD;   293 DOY;   18/10/20
GRB_TIME:        68433.51 SOD {19:00:33.51} UT
TRIGGER_INDEX:   122
GRB_PHI:          64.63 [deg]
GRB_THETA:        12.14 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     0.128 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     28.93 [sigma]
IMAGE_SIGNIF:    8.26 [sigma]
LC_URL:          sw00867987000msb.lc
SUN_POSTN:       205.38d {+13h 41m 31s}  -10.52d {-10d 31' 29"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.12d {+22h 56m 28s}  -10.17d {-10d 10' 04"}
MOON_DIST:        44.96 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.77,-69.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      347.74,-47.74 [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 = 52.72,18.47 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:07:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.980d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
POINT_ROLL:      193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68555.11 SOD {19:02:35.11} UT,   121.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.224
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00867987000msufc0121.fits
SUN_POSTN:       205.38d {+13h 41m 31s}  -10.53d {-10d 31' 31"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.14d {+22h 56m 33s}  -10.16d {-10d 09' 42"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:07:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.980d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
POINT_ROLL:      193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68555.11 SOD {19:02:35.11} UT,   121.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.224
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00867987000msufc0121.fits
SUN_POSTN:       205.38d {+13h 41m 31s}  -10.53d {-10d 31' 31"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.14d {+22h 56m 33s}  -10.16d {-10d 09' 39"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [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 20 Oct 18 19:08:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.980d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
ROLL:            193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68555.11 SOD {19:02:35.11} UT,   121.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     561754976
X_OFFSET:        712 [pixels]
Y_OFFSET:        923 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       872
Y_GRB_POS:       1083
BINNING_INDEX:   1
IM_URL:          sw00867987000msuni0143.fits
SUN_POSTN:       205.38d {+13h 41m 31s}  -10.53d {-10d 31' 32"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.15d {+22h 56m 35s}  -10.16d {-10d 09' 31"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:08:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.980d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
ROLL:            193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68555.11 SOD {19:02:35.11} UT,   121.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     561754976
X_OFFSET:        712 [pixels]
Y_OFFSET:        923 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       872
Y_GRB_POS:       1083
BINNING_INDEX:   1
IM_URL:          sw00867987000msuni0143.fits
SUN_POSTN:       205.38d {+13h 41m 31s}  -10.53d {-10d 31' 32"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.15d {+22h 56m 35s}  -10.16d {-10d 09' 29"}
MOON_DIST:        44.97 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:10:35 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     867987,   Seg_Num: 0
GRB_RA:           13.9824d {+00h 55m 55.77s} (J2000),
                  14.1957d {+00h 56m 46.95s} (current),
                  13.4139d {+00h 53m 39.32s} (1950)
GRB_DEC:         -47.3810d {-47d 22' 51.6"} (J2000),
                 -47.2795d {-47d 16' 46.1"} (current),
                 -47.6515d {-47d 39' 05.3"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         17.51 +/- 0.14 [mag]
FILTER:          7, U
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  68552.00 SOD {19:02:32.00} UT,   118.5 [sec] since BAT Trigger Time
SUN_POSTN:       205.38d {+13h 41m 32s}  -10.53d {-10d 31' 34"}
SUN_DIST:        121.34 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.16d {+22h 56m 39s}  -10.15d {-10d 09' 09"}
MOON_DIST:        44.96 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      347.75,-47.75 [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 5.8 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:18:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.979d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
POINT_ROLL:      193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  69310.88 SOD {19:15:10.88} UT,   877.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.265
N_STARS:         190
X_OFFSET:        152 [pixels]
Y_OFFSET:        363 [pixels]
X_MAX:           1591 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00867987000msufc0877.fits
SUN_POSTN:       205.39d {+13h 41m 33s}  -10.53d {-10d 31' 40"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.22d {+22h 56m 54s}  -10.13d {-10d 07' 56"}
MOON_DIST:        44.95 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Oct 18 19:18:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.979d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
POINT_ROLL:      193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  69310.88 SOD {19:15:10.88} UT,   877.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.265
N_STARS:         190
X_OFFSET:        152 [pixels]
Y_OFFSET:        363 [pixels]
X_MAX:           1591 [pixels]
Y_MAX:           1802 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00867987000msufc0877.fits
SUN_POSTN:       205.39d {+13h 41m 33s}  -10.53d {-10d 31' 41"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.23d {+22h 56m 55s}  -10.13d {-10d 07' 53"}
MOON_DIST:        44.95 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [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 20 Oct 18 19:19:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.979d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
ROLL:            193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  69310.88 SOD {19:15:10.88} UT,   877.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     561755732
X_OFFSET:        711 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       871
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00867987000msuni0899.fits
SUN_POSTN:       205.39d {+13h 41m 33s}  -10.53d {-10d 31' 42"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.24d {+22h 56m 57s}  -10.13d {-10d 07' 42"}
MOON_DIST:        44.95 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [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 20 Oct 18 19:19:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     867987,   Seg_Num: 0
POINT_RA:         13.979d {+00h 55m 55s} (J2000)
POINT_DEC:       -47.393d {-47d 23' 33"} (J2000)
ROLL:            193.143d
IMG_START_DATE:  18411 TJD;   293 DOY;   18/10/20
IMG_START_TIME:  69310.88 SOD {19:15:10.88} UT,   877.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     561755732
X_OFFSET:        711 [pixels]
Y_OFFSET:        922 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       871
Y_GRB_POS:       1082
BINNING_INDEX:   1
IM_URL:          sw00867987000msuni0899.fits
SUN_POSTN:       205.39d {+13h 41m 33s}  -10.53d {-10d 31' 42"}
SUN_DIST:        121.33 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      344.24d {+22h 56m 57s}  -10.13d {-10d 07' 40"}
MOON_DIST:        44.95 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      300.74,-69.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      347.74,-47.76 [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 #23349
M. J. Moss (George Washington University), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), J.D. Gropp (PSU), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 19:00:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 181020A (trigger=867987). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 13.967, -47.380 which is
```
   RA(J2000) = 00h 55m 52s
   Dec(J2000) = -47d 22' 47"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~12000 counts/sec (15-350 keV), at ~7 sec after the trigger.
The XRT began observing the field at 19:01:29.0 UT, 55.6 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 13.9837, -47.3796 which is equivalent to:
```
   RA(J2000)  = 00h 55m 56.09s
   Dec(J2000) = -47d 22' 46.6"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 40 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 6.04e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 121 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	00:55:55.78 =  13.98240
  DEC(J2000) = -47:22:51.8  = -47.38105
```
with a 90%-confidence error radius of about 0.76 arc sec. This position is 6.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.51 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is M. J. Moss (mikejmoss3 AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #23350
M. Axelsson (KTH and Stockholm University) reports on behalf of the Fermi-LAT team:
On October 20, 2018, Fermi-LAT detected high-energy emission from GRB 181020A, which was also detected by Swift (Moss et al. 2018, GCN 23349) and by Fermi-GBM (trigger 561754838).
The best LAT on-ground location is found to be
RA, Dec = 14.1, -47.3 (J2000)
with an error radius of 1.1 deg (90 % containment, statistical error only). This is 0.19 deg from the Swift location.
This was 50 deg from the LAT boresight at the time of the GBM trigger: 19:00:33.30 UT.
The data from the Fermi-LAT in the time interval 0-50s after the GBM trigger show a significant increase in the event rate that is spatially and temporally correlated with the trigger with very high significance. The highest-energy photon is a 930 MeV event which is observed 18 seconds after the GBM trigger.
The Fermi-LAT point of contact for this burst is Masanori Ohno (ohno@astro.hiroshima-u.ac.jp).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #23351
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1995 s of XRT Photon Counting mode data and 3 UVOT images for GRB 181020A, 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 = 13.98251, -47.38033 which is equivalent to:
```
RA (J2000): 00h 55m 55.80s
Dec (J2000): -47d 22' 49.2"
```
with an uncertainty of 1.7 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 #23352
P. Veres (UAH) reports on behalf of the Fermi GBM Team:
"At 19:00:33.30 UT on 20 October 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 181020A (trigger 561754838 / 181020792). which was also detected by Fermi/LAT (Axelsson GCN 23350) and Swift/BAT (Moss et al., GCN 23349). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees.
The GBM light curve shows a single bright pulse with a duration (T90) of about 15 s (50-300 keV). The time-averaged spectrum from T0-2 s to T0+20.5 s is best fit by a Band function with Epeak = 367 +/- 17 keV, alpha = -0.70 +/- 0.02, and beta = -2.06 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is (3.07 +/- 0.04)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.4 s in the 10-1000 keV band is 16.6 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #23353
K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Tohuvavohu (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and M.J. Moss report on behalf of the Swift-XRT team:
We have analysed 7.3 ks of XRT data for GRB 181020A (Moss et al. GCN Circ. 23349), from 61 s to 18.3 ks after the BAT trigger. The data comprise 1.1 ks in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 23351).
The late-time light curve (from T0+4.8 ks) can be modelled with a power-law decay with a decay index of alpha=1.2 (+/-1.0).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.865 (+0.020, -0.019). The best-fitting absorption column is 4.3 (+0.5, -0.4) x 10^20 cm^-2, in excess of the Galactic value of 1.6 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.97 (+0.09, -0.08) and a best-fitting absorption column of 5.2 (+1.9, -1.8) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.2 (+1.9, -1.8) x 10^20 cm^-2
Galactic foreground: 1.6 x 10^20 cm^-2
Excess significance: 3.2 sigma
Photon index:	     1.97 (+0.09, -0.08)
```
If the light curve continues to decay with a power-law decay index of 1.2, 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 1.4 x 10^-12 (1.6 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/00867987.
This circular is an official product of the Swift-XRT team.
GCN Circular #23356
Johan P. U. Fynbo (DAWN/NBI and DAWN/DTU), Antonio de Ugarte Postigo (HETH/IAA-CSIC and DARK/NBI), Valerio D'Elia (ASI-SSDC), Nial R. Tanvir (Univ. Leicester), Giovanna Pugliese (API/Univ. Amsterdam), D. Alexander Kann (HETH/IAA-CSIC), D. Malesani (DAWN/NBI, DAWN/DTU, and DARK/NBI), and Kasper E. Heintz (Univ. Iceland), report on behalf of the Stargate collaboration:
We observed the optical afterglow of the bright Swift and Fermi GRB 181020A (Moss et al., GCN 23349; Axelsson, GCN 23350; Veres, GCN 23352) with the ESO VLT UT2 equipped with the X-shooter instrument. Spectroscopy covering the wavelength range 3000-21000 AA was carried out starting on 2018 Oct 21.030 UT (5.7 hr after the GRB), for a total of 4x600 s exposure time.
In a 5-s image taken with the acquisition camera on 2018 Oct 10.023 UT, we measure for the afterglow R ~ 17.3 (Vega), assuming R = 18.34 for the USNO star at RA = 00:55:51.53, Dec = -47:23:14.5.
The spectrum has a very high S/N. A wide trough is easily visible around 4780 AA, which we interpret as a DLA in the GRB host system. From detection of a plethora of absorption lines, including Al II, Al III, S II, O I, Si II, Si IV, C IV, Zn II, Cr II, Ni II, Fe II, Mn II, O I*, Si II*, Ni II*, Fe II*, we measure the redshift to be z = 2.938. The velocity structure of the lines spans the redshift range 2.9360-2.9407 (2.938 corresponding to the strongest component). The detection of fine-structure lines makes the redshift association with the GRB host system secure. Intervening absorbers are also detected at z = 1.788 (Mg II), 2.172 (Mg II), and 2.822 (C IV).
We acknowledge the ESO observing staff in Paranal for conducting these observations, in particular Elizabeth Bartlett, Stephane Brillant, Marcelo Lopez, and Thomas Rivinius.
GCN Circular #23357
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), M. J. Moss (GWU), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 181020A (trigger #867987) (Moss et al., GCN Circ. 23349). The BAT ground-calculated position is RA, Dec = 13.987, -47.372 deg which is
```
  RA(J2000)  =  00h 55m 56.9s 
  Dec(J2000) = -47d 22' 18.1" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 94%.
The mask-weighted light curve shows a large pulse that starts at ~T-1 s, peaks at ~T+8 s and ends at ~T+30 s. There is a second, much weaker, pulse that occurs at ~T+200 s and lasts until ~T+270 s. T90 (15-350 keV) is 238.0 +- 11.6 sec (estimated error including systematics).
The time-averaged spectrum from T-1.45 to T+271.20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.25 +- 0.06. The fluence in the 15-150 keV band is 8.1 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+7.26 sec in the 15-150 keV band is 7.7 +- 0.3 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/867987/BA/
GCN Circular #23358
A. Cucchiara (U. Virgin Islands), C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), D. Morris (U. of Virgin Islands) on behalf of a large collaboration report:
We observed Swift GRB 181020A (Moss et al. GCN 23349) with one of the LCO 1-m unit at Cerro Tololo Observatory on October 20, from 23:55 to Oct 21, 00:49 UT (corresponding to 4.9 to 5.8 hours from the GRB trigger time) with the SDSS r' and i' filters. We clearly detect the optical afterglow (Moss et al. GCN 23349) in both filters with the following magnitudes for the first half of the observation run:
```
Mid time from GRB����� Exposure�������� Filter��������� Magnitude
trigger time (hrs)���� (s)
---------------------------------------------------------------------
5.0������������������ 5x120������������ SDSS r'�������� 17.55 +- 0.03
5.2������������������ 5x120������������ SDSS i'�������� 17.2� +- 0.1
---------------------------------------------------------------------
```
as calibrated against nearby USNO UCAC4 objects.
GCN Circular #23359
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was starting survey on the SWIFT GRB181020.79 error-box (ra=00 55 55.78 dec=-47 22 52 r=0.05; Moss et all., GCN #23349; Axelsson et al., Fermi LAT, GCN #23350) 7550 sec after notice time and 7572 sec after trigger time at 2018-10-20 21:06:45 UT. The delay connected with weather condition around trigeer time. The 5-sigma upper limit on our first (540s exposure) coadd set is about 19.5 mag
We see possible nonmonotonic behaviour OT detected UVOT ( Moss et all., GCN #23349;). More accurate (handmade) reduction will be coming.
The automatic OT LC is available at http://observ.pereplet.ru/images/GRB181020A_LC.jpg
The galactic latitude b = -70 deg., longitude l = 300 deg. The observations made on zenit distance = 16 deg.The moon (85 % bright part) is 60 deg. above the horizon. The distance between moon and object is 45 degrees. The sun altitude is -43.7 deg. The object can be observed till sunrise at 2018-10-21 03:49:44
This message may be cited.
GCN Circular #23360
J. D. Gropp (PSU), M. De Pasquale (U. Instanbul) and Moss (George Washington University) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181020A 122 s after the BAT trigger (Moss et al., GCN Circ. 23349). A fading source consistent with the XRT enhanced position (Goad et al. GCN Circ. 23351) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  00:55:55.77 =  13.98239 (deg.)
    Dec (J2000) = -47:22:51.9  = -47.38108 (deg.)
```
with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence). This optical afterglow is also reported by VLT/X-shooter, Fynbo et al., GCN Circ. 23356; LCO Cerro Tololo, Cucchiara et al., GCN Circ. 23358; and its position is consistent with the Fermi LAT Measurement reported in, Axelsson et al., GCN Circ. 23350;
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)        Mag

b                   352         1027          97     17.18+-0.07
m2                  427          745          58       >18.06
u_fc                 96         6797         768     18.52+-0.09
u                    96          346         245     17.60+-0.08
v                    21          720          67     14.89+-0.04
w1                  452          769          58       >18.20
w2                  379         1053          97       >18.56
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
We note that the non-detection in the UV filters is expected for a source at the reported redshift z=2.94 (VLT/X-shooter, Fynbo et al., GCN Circ. 23356;), given the Lyman forest absorption by intergalactic hydrogen.
GCN Circular #23362
A. Melandri, S.Covino, P. D'Avanzo, D. Fugazza (INAF-OAB), on behalf of the REM team, report:
We observed the optical counterpart of GRB 181020A (Moss et al. GCN 23349; Axelsson GCN 23350; Veres GCN 23352; Fynbo et al. GCN 23356; Cucchiara et al. GCN 23358; Gropp et al. GCN 23360) with the REM 60cm robotic telescope located at the ESO premise of La Silla (Chile). The observations were performed starting on 2018 October 20 at 23:51 UT (i.e. 4.86 hrs after the burst) and were carried in the g, r, i, z, J, H and K bands.
The GRB afterglow is detected in the first set of optical and NIR images. From preliminary photometry we estimate the following magnitudes:
```
r = 17.3 +/- 0.2 
i = 16.8 +/- 0.1 
```
at a mean time of 294 min from the GRB time (AB magnitudes, calibrated against the USNO UCAC4 catalogue).
GCN Circular #23363
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report:
The� GRB 181020A� (Swift-BAT detection: Moss et al., GCN 23349; Sakamoto� et al., GCN 23357; Fermi-LAT detection: Axelsson, GCN 23350; Fermi GBM detection: Veres, GCN 23352) triggered Konus-Wind at T0=68437.284 s UT (19:00:37.284).
The burst light curve shows a single pulse with a total duration of ~26 s. The emission is seen up to ~5 MeV.
As observed by Konus-Wind, the burst had a fluence of 4.17(-0.54,+0.58)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+7.552 s, of 8.27(-1.99,+2.05)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+15.360 s) is best fit in the 20 keV - 20 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.73(-0.11,+0.13), the high energy photon index beta = -2.35(-0.41,+0.22), the peak energy Ep = 371(-52,+57) keV, chi2 = 80/97 dof.
Assuming the redshift z=2.938 (Fynbo et al., GCN 23356) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is 8.28(-1.07,+1.16)x10^53 erg, the peak luminosity L_iso is 6.47(-1.56,+1.60)x10^53 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is 1461(-205,+225) keV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB181020_T68437/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #23436
V. Sharma, T. Khanam and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 181020A, which was also detected by Swift (Moss M. J. et al., GCN 23349, XRT: Goad M. R. et al., GCN 23351, BAT: Sakamoto T. et al., GCN 23357), Fermi (LAT: Axelsson M. et al., GCN 23350 and GBM: Veres P. et al., GCN 23352), and Konus-Wind (Tsvetkova A. et al., GCN 23363).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 19:00:40.500 UT. The measured peak count rate is 1000 cts/s above the background in combined data of four quadrants, with a total of 8409 cts. The local mean background count rate was 513.8 cts/s. Using cumulative rates, we measure a T90 of 19.4 s. In preliminary analysis, we find that 749 compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.

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Jochen Greiner, last update: 23-Nov-2018 [Disclaimer]