Gamma-ray Burst 190828B

(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:     Wed 28 Aug 19 13:00:20 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.818d {+16h 47m 16s} (J2000),
                 252.017d {+16h 48m 04s} (current),
                 251.314d {+16h 45m 15s} (1950)
GRB_DEC:         +27.237d {+27d 14' 12"} (J2000),
                 +27.203d {+27d 12' 10"} (current),
                 +27.325d {+27d 19' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3183 [cnts]    Image_Peak=212 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       15888 [cnts]
BKG_TIME:        46784.51 SOD {12:59:44.51} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.42 SOD {12:59:59.42} UT
GRB_PHI:         -20.79 [deg]
GRB_THETA:         2.91 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     23.85 [sigma]
IMAGE_SIGNIF:    10.03 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +0  +0  +0 
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 42"}
SUN_DIST:         90.17 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.93d {+08h 43m 44s}  +20.14d {+20d 08' 35"}
MOON_DIST:       105.88 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.93, 49.11 [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 = 65.59,-14.73 [deg].
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=588690004).

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:00:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     588690004
GRB_RA:          241.633d {+16h 06m 32s} (J2000),
                 241.842d {+16h 07m 22s} (current),
                 241.103d {+16h 04m 25s} (1950)
GRB_DEC:         +24.200d {+24d 11' 60"} (J2000),
                 +24.148d {+24d 08' 53"} (current),
                 +24.333d {+24d 20' 00"} (1950)
GRB_ERROR:       8.27 [deg radius, statistical plus systematic]
GRB_INTEN:       155 [cnts/sec]
DATA_SIGNIF:     13.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         120.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.71
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 42"}
SUN_DIST:         81.58 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      130.94d {+08h 43m 45s}  +20.14d {+20d 08' 34"}
MOON_DIST:        99.49 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       40.47, 46.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      232.91, 44.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 78.53,-20.47 [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=922808).

GCN NOTICE

  
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:00:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     588690004
GRB_RA:          241.567d {+16h 06m 16s} (J2000),
                 241.775d {+16h 07m 06s} (current),
                 241.036d {+16h 04m 09s} (1950)
GRB_DEC:         +24.183d {+24d 10' 60"} (J2000),
                 +24.131d {+24d 07' 53"} (current),
                 +24.317d {+24d 19' 01"} (1950)
GRB_ERROR:       10.50 [deg radius, statistical plus systematic]
GRB_INTEN:       184 [cnts/sec]
DATA_SIGNIF:     7.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         120.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.78
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 42"}
SUN_DIST:         81.52 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      130.93d {+08h 43m 44s}  +20.14d {+20d 08' 35"}
MOON_DIST:        99.44 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       40.42, 46.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      232.84, 44.02 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 78.53,-20.47 [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=922808).

GCN NOTICE

  
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:00:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     588690004
GRB_RA:          248.650d {+16h 34m 36s} (J2000),
                 248.860d {+16h 35m 26s} (current),
                 248.116d {+16h 32m 28s} (1950)
GRB_DEC:         +22.380d {+22d 22' 48"} (J2000),
                 +22.340d {+22d 20' 25"} (current),
                 +22.483d {+22d 28' 57"} (1950)
GRB_ERROR:       2.15 [deg radius, statistical only]
DATA_SIGNIF:     15.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         135.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 42"}
SUN_DIST:         88.22 [deg]   Sun_angle= -6.1 [hr] (East of Sun)
MOON_POSTN:      130.94d {+08h 43m 45s}  +20.14d {+20d 08' 34"}
MOON_DIST:       106.01 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       40.52, 39.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.21, 43.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_588690004.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=922808).

GCN NOTICE

  
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:01:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     588690004
GRB_RA:          248.680d {+16h 34m 43s} (J2000),
                 248.890d {+16h 35m 34s} (current),
                 248.146d {+16h 32m 35s} (1950)
GRB_DEC:         +22.380d {+22d 22' 48"} (J2000),
                 +22.340d {+22d 20' 25"} (current),
                 +22.482d {+22d 28' 57"} (1950)
GRB_ERROR:       1.58 [deg radius, statistical only]
DATA_SIGNIF:     20.60 [sigma]
DATA_INTERVAL:   9.216 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         135.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 41"}
SUN_DIST:         88.25 [deg]   Sun_angle= -6.1 [hr] (East of Sun)
MOON_POSTN:      130.95d {+08h 43m 48s}  +20.14d {+20d 08' 26"}
MOON_DIST:       106.02 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       40.53, 39.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.25, 43.79 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_588690004.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=8362).

GCN NOTICE

  
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 28 Aug 19 13:01:21 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8362,   Sub_Num: 0
GRB_INTEN:      9.01 [sigma]   
GRB_TIME:       46798.08 SOD {12:59:58.08} UT
GRB_DATE:       18723 TJD;   240 DOY;   19/08/28
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=588690004). 
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-08/2019-08-28T12-59-57.8919-27780-23440-0.lc

GCN NOTICE

  
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:02:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     588690004
GRB_RA:          248.850d {+16h 35m 24s} (J2000),
                 249.060d {+16h 36m 14s} (current),
                 248.317d {+16h 33m 16s} (1950)
GRB_DEC:         +22.410d {+22d 24' 36"} (J2000),
                 +22.371d {+22d 22' 15"} (current),
                 +22.512d {+22d 30' 42"} (1950)
GRB_ERROR:       1.24 [deg radius, statistical only]
DATA_SIGNIF:     24.90 [sigma]
DATA_INTERVAL:   15.360 [sec]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         135.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 40"}
SUN_DIST:         88.40 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      130.95d {+08h 43m 49s}  +20.14d {+20d 08' 24"}
MOON_DIST:       106.14 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       40.62, 39.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.45, 43.85 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_588690004.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=8362).

GCN NOTICE

   
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:09:02 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     588690004
GRB_RA:          246.650d {+16h 26m 36s} (J2000),
                 246.856d {+16h 27m 25s} (current),
                 246.127d {+16h 24m 30s} (1950)
GRB_DEC:         +24.610d {+24d 36' 36"} (J2000),
                 +24.567d {+24d 34' 01"} (current),
                 +24.722d {+24d 43' 17"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.46 SOD {12:59:59.46} UT
GRB_PHI:         134.00 [deg]
GRB_THETA:        17.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       156.79d {+10h 27m 11s}   +9.69d {+09d 41' 34"}
SUN_DIST:         86.04 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:      131.03d {+08h 44m 07s}  +20.13d {+20d 07' 36"}
MOON_DIST:       103.24 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       42.66, 41.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.02, 45.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_locplot_all_bn190828542.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:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8362).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:01:29 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.8339d {+16h 47m 20.1s} (J2000),
                 252.0321d {+16h 48m 07.7s} (current),
                 251.3299d {+16h 45m 19.1s} (1950)
GRB_DEC:         +27.2810d {+27d 16' 51.5"} (J2000),
                 +27.2471d {+27d 14' 49.4"} (current),
                 +27.3690d {+27d 22' 08.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       73 [cnts]
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46854.12 SOD {13:00:54.12} UT,   54.7 [sec] since BAT Trigger Time
CENTROID_X:      322.48,  raw= 322  [pixels]
CENTROID_Y:      222.63,  raw= 223  [pixels]
ROLL:            280.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -177.90
GRB_POS_XRT_Z:   35.56
IMAGE_URL:       sw00922808000msxps_rw.img
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 41"}
SUN_DIST:         90.17 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.95d {+08h 43m 47s}  +20.14d {+20d 08' 28"}
MOON_DIST:       105.86 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.58, 38.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.93, 49.15 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:01:32 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.8339d {+16h 47m 20.1s} (J2000),
                 252.0321d {+16h 48m 07.7s} (current),
                 251.3299d {+16h 45m 19.1s} (1950)
GRB_DEC:         +27.2810d {+27d 16' 51.5"} (J2000),
                 +27.2471d {+27d 14' 49.4"} (current),
                 +27.3690d {+27d 22' 08.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       73 [cnts]
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46854.12 SOD {13:00:54.12} UT,   54.7 [sec] since BAT Trigger Time
CENTROID_X:      322.48,  raw= 322  [pixels]
CENTROID_Y:      222.63,  raw= 223  [pixels]
ROLL:            280.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -177.90
GRB_POS_XRT_Z:   35.56
IMAGE_URL:       sw00922808000msxps_rw.img
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 41"}
SUN_DIST:         90.17 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.95d {+08h 43m 47s}  +20.14d {+20d 08' 27"}
MOON_DIST:       105.86 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.58, 38.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.93, 49.15 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:01:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.8339d {+16h 47m 20.13s} (J2000),
                 252.0321d {+16h 48m 07.71s} (current),
                 251.3299d {+16h 45m 19.16s} (1950)
GRB_DEC:         +27.2810d {+27d 16' 51.5"} (J2000),
                 +27.2471d {+27d 14' 49.4"} (current),
                 +27.3690d {+27d 22' 08.2"} (1950)
GRB_ERROR:       5.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.12e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.54 [sigma]
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46854.12 SOD {13:00:54.12} UT,   54.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.16 261.68 243.35
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       156.79d {+10h 27m 09s}   +9.69d {+09d 41' 41"}
SUN_DIST:         90.17 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.94d {+08h 43m 47s}  +20.14d {+20d 08' 29"}
MOON_DIST:       105.86 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.58, 38.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.93, 49.15 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.78 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:04:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.812d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.235d {+27d 14' 05"} (J2000)
POINT_ROLL:      280.933d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46862.50 SOD {13:01:02.50} UT,   63.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.611
N_STARS:         100
X_OFFSET:        464 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1423 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00922808000msufc0063.fits
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 39"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.97d {+08h 43m 54s}  +20.14d {+20d 08' 10"}
MOON_DIST:       105.85 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:04:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.812d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.235d {+27d 14' 05"} (J2000)
POINT_ROLL:      280.933d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46862.50 SOD {13:01:02.50} UT,   63.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.611
N_STARS:         100
X_OFFSET:        464 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1423 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00922808000msufc0063.fits
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 38"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.98d {+08h 43m 54s}  +20.14d {+20d 08' 09"}
MOON_DIST:       105.85 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:05:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.812d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.235d {+27d 14' 05"} (J2000)
ROLL:            280.933d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46862.50 SOD {13:01:02.50} UT,   63.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     588690085
X_OFFSET:        910 [pixels]
Y_OFFSET:        1222 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1382
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0087.fits
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 38"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.99d {+08h 43m 57s}  +20.13d {+20d 08' 02"}
MOON_DIST:       105.85 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:05:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.812d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.235d {+27d 14' 05"} (J2000)
ROLL:            280.933d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46862.50 SOD {13:01:02.50} UT,   63.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     588690085
X_OFFSET:        910 [pixels]
Y_OFFSET:        1222 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1382
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0087.fits
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 37"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.99d {+08h 43m 57s}  +20.13d {+20d 08' 01"}
MOON_DIST:       105.84 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:05:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.818d {+16h 47m 16s} (J2000),
                 252.017d {+16h 48m 04s} (current),
                 251.314d {+16h 45m 15s} (1950)
GRB_DEC:         +27.237d {+27d 14' 12"} (J2000),
                 +27.203d {+27d 12' 10"} (current),
                 +27.325d {+27d 19' 29"} (1950)
GRB_DATE:        18723 TJD;   240 DOY;   19/08/28
GRB_TIME:        46799.42 SOD {12:59:59.42} UT
TRIGGER_INDEX:   146
GRB_PHI:         -20.79 [deg]
GRB_THETA:         2.91 [deg]
DELTA_TIME:      -50.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     23.85 [sigma]
IMAGE_SIGNIF:    10.03 [sigma]
LC_URL:          sw00922808000msb.lc
SUN_POSTN:       156.79d {+10h 27m 10s}   +9.69d {+09d 41' 37"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      130.99d {+08h 43m 58s}  +20.13d {+20d 07' 58"}
MOON_DIST:       105.84 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.52, 38.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.93, 49.11 [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 = 65.59,-14.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:12:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
POINT_ROLL:      280.937d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47074.48 SOD {13:04:34.48} UT,   275.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.417
N_STARS:         82
X_OFFSET:        590 [pixels]
Y_OFFSET:        902 [pixels]
X_MAX:           1549 [pixels]
Y_MAX:           1861 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00922808000msufc0275.fits
SUN_POSTN:       156.80d {+10h 27m 11s}   +9.69d {+09d 41' 31"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.07d {+08h 44m 16s}  +20.12d {+20d 07' 12"}
MOON_DIST:       105.80 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:12:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
POINT_ROLL:      280.937d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47074.48 SOD {13:04:34.48} UT,   275.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.417
N_STARS:         82
X_OFFSET:        590 [pixels]
Y_OFFSET:        902 [pixels]
X_MAX:           1549 [pixels]
Y_MAX:           1861 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00922808000msufc0275.fits
SUN_POSTN:       156.80d {+10h 27m 11s}   +9.69d {+09d 41' 31"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.07d {+08h 44m 16s}  +20.12d {+20d 07' 10"}
MOON_DIST:       105.79 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:13:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
ROLL:            280.937d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47074.48 SOD {13:04:34.48} UT,   275.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     588690297
X_OFFSET:        910 [pixels]
Y_OFFSET:        1222 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1382
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0299.fits
SUN_POSTN:       156.80d {+10h 27m 11s}   +9.69d {+09d 41' 30"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.08d {+08h 44m 19s}  +20.12d {+20d 07' 04"}
MOON_DIST:       105.79 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:13:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
ROLL:            280.937d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47074.48 SOD {13:04:34.48} UT,   275.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     588690297
X_OFFSET:        910 [pixels]
Y_OFFSET:        1222 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1382
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0299.fits
SUN_POSTN:       156.80d {+10h 27m 11s}   +9.69d {+09d 41' 30"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.08d {+08h 44m 19s}  +20.12d {+20d 07' 03"}
MOON_DIST:       105.79 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #25516
The Fermi GBM team reports the detection of a likely LONG GRB
At 12:59:59 UT on 28 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190828B (trigger 588690004.456526 / 190828542).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 246.6, Dec = 24.6 (J2000 degrees, equivalent to J2000 16h 26m, 24d 36'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 17.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_skymap_all_bn190828542.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_healpix_all_bn190828542.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828542/quicklook/glg_lc_medres34_bn190828542.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:13:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     922808,   Seg_Num: 0
GRB_RA:          251.8315d {+16h 47m 19.56s} (J2000),
                 252.0297d {+16h 48m 07.13s} (current),
                 251.3275d {+16h 45m 18.58s} (1950)
GRB_DEC:         +27.2808d {+27d 16' 50.8"} (J2000),
                 +27.2469d {+27d 14' 48.6"} (current),
                 +27.3688d {+27d 22' 07.5"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  46952.00 SOD {13:02:32.00} UT,   152.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       156.80d {+10h 27m 11s}   +9.69d {+09d 41' 31"}
SUN_DIST:         90.16 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.07d {+08h 44m 17s}  +20.12d {+20d 07' 08"}
MOON_DIST:       105.78 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.58, 38.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.93, 49.15 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:20:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
POINT_ROLL:      280.936d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47675.60 SOD {13:14:35.60} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.535
N_STARS:         190
X_OFFSET:        350 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1789 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00922808000msufc0876.fits
SUN_POSTN:       156.80d {+10h 27m 12s}   +9.69d {+09d 41' 24"}
SUN_DIST:         90.15 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.16d {+08h 44m 37s}  +20.10d {+20d 06' 15"}
MOON_DIST:       105.74 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 28 Aug 19 13:21:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
POINT_ROLL:      280.936d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47675.60 SOD {13:14:35.60} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.535
N_STARS:         190
X_OFFSET:        350 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1789 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00922808000msufc0876.fits
SUN_POSTN:       156.80d {+10h 27m 12s}   +9.69d {+09d 41' 23"}
SUN_DIST:         90.15 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.16d {+08h 44m 38s}  +20.10d {+20d 06' 13"}
MOON_DIST:       105.74 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:22:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
ROLL:            280.936d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47675.60 SOD {13:14:35.60} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     588690899
X_OFFSET:        909 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1069
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0900.fits
SUN_POSTN:       156.80d {+10h 27m 13s}   +9.69d {+09d 41' 23"}
SUN_DIST:         90.15 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.17d {+08h 44m 41s}  +20.10d {+20d 06' 06"}
MOON_DIST:       105.73 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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:     Wed 28 Aug 19 13:22:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     922808,   Seg_Num: 0
POINT_RA:        251.813d {+16h 47m 15s} (J2000)
POINT_DEC:       +27.234d {+27d 14' 02"} (J2000)
ROLL:            280.936d
IMG_START_DATE:  18723 TJD;   240 DOY;   19/08/28
IMG_START_TIME:  47675.60 SOD {13:14:35.60} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     588690899
X_OFFSET:        909 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1069
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00922808000msuni0900.fits
SUN_POSTN:       156.80d {+10h 27m 13s}   +9.69d {+09d 41' 22"}
SUN_DIST:         90.15 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      131.17d {+08h 44m 42s}  +20.10d {+20d 06' 04"}
MOON_DIST:       105.73 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       47.51, 38.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.92, 49.10 [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 #25517
S. Dichiara (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), M. G. Bernardini (INAF-OAB), A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), P. A. Evans (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 12:59:59.42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190828B (trigger=922808). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 251.818, 27.237 which is
```
   RA(J2000) = 16h 47m 16s
   Dec(J2000) = +27d 14' 12"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 13:00:54.1 UT, 54.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 251.8317, 27.2808 which is equivalent to:
```
   RA(J2000)  = 16h 47m 19.60s
   Dec(J2000) = +27d 16' 50.9"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 163 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.84 x 10^20 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 2.12e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 63 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.10.
Burst Advocate for this burst is S. Dichiara (dichiara AT umd.edu). 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 #25518
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 (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
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 GRB190828.54 (trigger No 922808,16h 47m 16.320s , +27d 14m 13.20s, R=0.05) errorbox 648 sec after notice time and 674 sec after trigger time at 2019-08-28 13:11:13 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenit distance = 31 deg. The sun altitude is -10.6 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1118074
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     734 |        MASTER-Tunka |  P| |   120 | 18.4 |        
     734 |        MASTER-Tunka |  P- |   120 | 16.8 |        
    1189 |        MASTER-Tunka |  P| |   180 | 19.3 |        
    1189 |        MASTER-Tunka |  P- |   180 | 17.4 |        
    1491 |        MASTER-Tunka |  P| |   180 | 19.4 |        
    1491 |        MASTER-Tunka |  P- |   180 | 17.8 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #25521
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1594 s of XRT Photon Counting mode data and 2 UVOT images for GRB 190828B, 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 = 251.83127, +27.28091 which is equivalent to:
```
RA (J2000): 16h 47m 19.51s
Dec (J2000): +27d 16' 51.3"
```
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 #25524
B.Y. Yu, X. Liu, D. Xu, Z.P. Zhu (NAOC), J.H. Liu (XAO), X. Gao (Urumqi No.1 Senior High School), Z.B. Zhang (XJTS) report:
We observed the field of GRB 190828B (Dichiara et al., GCN 25517) using the Half-Meter Telescope (HMT-0.5m) located at Dabancheng, Xinjiang, China. We obtained 5x60 s unfiltered frames, started at 13:56:32 UT on 2019-08-28, i.e., 56.5 min after the burst.
No optical source is detected at the XRT position (Dichiara et al., GCN25517) in our stacked image, down to a limiting magnitude of R~17.8, calibrated with the nearby SDSS field.
GCN Circular #25534
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Dichiara (NASA/GSFC/UMCP), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): (i.e. the Swift-BAT team):
Using the data set from T-239 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190828B (trigger #922808) (Dichiara et al., GCN Circ. 25517). The BAT ground-calculated position is RA, Dec = 251.838, 27.287 deg which is
```
   RA(J2000)  =  16h 47m 21.2s
   Dec(J2000) = +27d 17' 12.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a multi-peak structure that starts at ~T-40 s and ends at ~T+50 s. There are roughly three main peaks that occurs at ~T0, ~T+11 s, and ~T+31 s, respectively. T90 (15-350 keV) is 66.6 +- 6.2 sec (estimated error including systematics).
The time-averaged spectrum from T-42.4 to T+53.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.29 +- 0.07. The fluence in the 15-150 keV band is 4.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.74 sec in the 15-150 keV band is 2.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/922808/BA/
GCN Circular #25535
O.J. Roberts (USRA/MSFC), E. Bissaldi (INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 12:59:59.46 UT on 28 August 2019, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 190828B (trigger 588690004 / 190828542), which was also detected by Swift (Dichiara et al. 2019, GCN 25517 )
The Fermi GBM Final Real-time Localization (GCN 25516) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 18 degrees.
The GBM light curve consists of multiple, bright peaks with a duration (T90) of about 55 s (50-300 keV). The time-averaged spectrum from T0-34 s to T0+46 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.99 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 237 +/- 22 keV
The event fluence (10-1000 keV) in this time interval is (1.24 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10.6 s in the 10-1000 keV band is 3.9 +/- 0.2 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 #25544
S. R. Oates (U.Warwick) and S. Dichiara (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190828B 63 s after the BAT trigger (Dichiara et al., GCN Circ. 25517). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 25521) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            63          213          147         >20.8
u_FC               275          525          246         >20.1
white               63         1717          411         >21.4
v                  605         1767          136         >19.1
b                  530         1693          117         >20.0
u                  275         1668          363         >20.4
w1                 654         1644          117         >19.2
m2                 630         5626          259         >19.4
w2                 580         1743          136         >19.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.10 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #25546
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (ASDC), B. Sbarufatti (PSU), D.N. Burrows (PSU), J. D. Gropp (PSU) and S. Dichiara report on behalf of the Swift-XRT team:
We have analysed 5.8 ks of XRT data for GRB 190828B (Dichiara et al. GCN Circ. 25517), from 60 s to 74.7 ks after the BAT trigger. The data comprise 90 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 25521).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=2.4 (+/-0.4). At T+98.4 s the decay flattens to an alpha of -1.5 (+0.0, -1.4). The light curve breaks again at T+110 s to a decay with alpha=3.5 (+0.7, -0.4), and again at T+217 s s to alpha=-0.24 (+0.16, -0.20), before a final break at T+1028 s s after which the decay index is 0.96 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.56 (+0.11, -0.09). The best-fitting absorption column is 7.8 (+3.8, -1.0) x 10^20 cm^-2, consistent with the Galactic value of 6.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.91 (+/-0.10) and a best-fitting absorption column of 1.25 (+0.29, -0.27) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.25 (+0.29, -0.27) x 10^21 cm^-2
Galactic foreground: 6.8 x 10^20 cm^-2
Excess significance: 3.4 sigma
Photon index:	     1.91 (+/-0.10)
```
If the light curve continues to decay with a power-law decay index of 0.96, the count rate at T+24 hours will be 0.035 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 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/00922808.
This circular is an official product of the Swift-XRT team.
GCN Circular #25548
A. Brosio (Oss. Astr. Savelli), A. Melandri (INAF-OAB), E. Palazzi (INAF-OAS), L. Nicastro (INAF-OAS), M.A. Tripodi (Oss. Astr. Savelli), S. Savaglio (UniCal) on behalf of a larger collaboration report:
We observed the field of GRB 190828B (Dichiara et al., GCN 25517) with the 0.5m Savelli Robotic Telescope (SRT) located at the Osservatorio Astronomico Lilio (Savelli, Italy). The observations were performed starting on 2019 August 28 at 19:19:22 UT (i.e. about 6.3 hours after the burst) and consisted of 24x300s exposures in the r-sdss band.
No optical counterpart is detected nearby the XRT enhanced position (Beardmore et al., GCN 25521) in our stacked image, down to a 5sigma limiting magnitude of r>20.5, at a mean time of about 7.48 hours after the GRB. Calibration was performed against the SDSS catalog.
GCN Circular #25550
J. P. U. Fynbo (DAWN/NBI), K. E. Heintz (Univ. of Iceland), D. B. Malesani (DTU space), and D. A. Perley (LJMU), report on behalf of the Stargate collaboration:
We imaged the field of the Swift (Dichiara et al., GCN 25517) and Fermi-GBM (Roberts et al., GCN 25536) detected GRB 190828B with the ESO-VLT/X-shooter acquisition camera between 00:03:44 and 00:22:49 UT on August 29 (i.e. 11.15 hr after the trigger). From the combined images, obtained with a total integration time of 210 sec, we identify a faint source within the XRT error circle with magnitude r = 23.55 +/- 0.15 AB mag, calibrated from the photometry of nearby field stars as listed in the Pan-STARRS archival data. To verify whether this source is the afterglow or host galaxy of the GRB, a second epoch of images is required.
We acknowledge the ESO observing staff at Paranal, especially Alain Smette, Camila Navarrete and Linda Schmidtobreick.
GCN Circular #25771
R. Gaikwad, V. Sharma, D. Bhattacharya and A. Vibhute (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 GRB 190828B, which was also detected by Fermi GBM Final Real-time Localization (GCN #25516), Swift (S. Dichiara. et al., GCN # 25517), Swift-XRT (Beardmore A. et al., GCN # 25521), Swift-BAT (Krimm H. et al., GCN # 25534), Fermi GBM (Roberts J. et al., GCN # 25535),.
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with the strongest peak at 2019-08-28 12:59:59.0 UT. The measured peak count rate associated with the burst is 297 cts/s above the background in the combined data of four quadrants, with a total of 3424 cts. The local mean background count rate was 611 cts/s. Using cumulative rates, we measure a T90 of 31.9 s.
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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