Gamma-ray Burst 190511A

(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 11 May 19 07:15:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     903158,   Seg_Num: 0
GRB_RA:          126.436d {+08h 25m 45s} (J2000),
                 126.652d {+08h 26m 37s} (current),
                 125.878d {+08h 23m 31s} (1950)
GRB_DEC:         -20.242d {-20d 14' 30"} (J2000),
                 -20.306d {-20d 18' 21"} (current),
                 -20.078d {-20d 04' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10399 [cnts]    Image_Peak=266 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   301     E_range: 25-100 keV
BKG_INTEN:       69401 [cnts]
BKG_TIME:        26033.11 SOD {07:13:53.11} UT
BKG_DUR:         40 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26088.28 SOD {07:14:48.28} UT
GRB_PHI:          -4.31 [deg]
GRB_THETA:        56.33 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     38.70 [sigma]
IMAGE_SIGNIF:    9.72 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +0  +0  +0  -6  +0 
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         86.12 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.51d {+08h 54m 02s}  +19.40d {+19d 24' 10"}
MOON_DIST:        40.27 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.05, 10.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      135.12,-38.15 [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 = 216.17,-15.32 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8267).

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 11 May 19 07:15:34 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8267,   Sub_Num: 0
GRB_INTEN:      9.33 [sigma]   
GRB_TIME:       26087.91 SOD {07:14:47.91} UT
GRB_DATE:       18614 TJD;   131 DOY;   19/05/11
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(23.0<100sec) coincident with the FERMI_GBM event (trignum=579251669).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-05/2019-05-11T07-14-47.7331-06116-11152-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:14:48 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     579251669
GRB_RA:          125.917d {+08h 23m 40s} (J2000),
                 126.135d {+08h 24m 33s} (current),
                 125.352d {+08h 21m 24s} (1950)
GRB_DEC:         -18.517d {-18d 31' 00"} (J2000),
                 -18.580d {-18d 34' 47"} (current),
                 -18.354d {-18d 21' 15"} (1950)
GRB_ERROR:       8.20 [deg radius, statistical plus systematic]
GRB_INTEN:       211 [cnts/sec]
DATA_SIGNIF:     9.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         264.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.84
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:        47.89d {+03h 11m 33s}  +17.83d {+17d 49' 38"}
SUN_DIST:         85.05 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      133.50d {+08h 54m 00s}  +19.40d {+19d 24' 15"}
MOON_DIST:        38.67 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      240.32, 10.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.89,-36.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.18,5.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:14:57 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     579251669
GRB_RA:          126.100d {+08h 24m 24s} (J2000),
                 126.308d {+08h 25m 14s} (current),
                 125.563d {+08h 22m 15s} (1950)
GRB_DEC:         -24.617d {-24d 37' 00"} (J2000),
                 -24.680d {-24d 40' 48"} (current),
                 -24.454d {-24d 27' 12"} (1950)
GRB_ERROR:       7.05 [deg radius, statistical plus systematic]
GRB_INTEN:       205 [cnts/sec]
DATA_SIGNIF:     18.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         255.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.84
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         87.37 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      133.50d {+08h 54m 00s}  +19.40d {+19d 24' 14"}
MOON_DIST:        44.64 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      245.54,  7.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      136.50,-42.40 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.18,5.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:15:00 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     579251669
GRB_RA:          125.200d {+08h 20m 48s} (J2000),
                 125.411d {+08h 21m 39s} (current),
                 124.655d {+08h 18m 37s} (1950)
GRB_DEC:         -22.790d {-22d 47' 23"} (J2000),
                 -22.852d {-22d 51' 07"} (current),
                 -22.631d {-22d 37' 49"} (1950)
GRB_ERROR:       3.04 [deg radius, statistical only]
DATA_SIGNIF:     22.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         260.00 [deg]
GRB_THETA:        21.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         85.95 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      133.50d {+08h 54m 00s}  +19.40d {+19d 24' 14"}
MOON_DIST:        42.99 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      243.54,  7.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.70,-40.92 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_579251669.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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:15:16 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      73
TRIGGER_NUM:     579251669
GRB_RA:          122.133d {+08h 08m 32s} (J2000),
                 122.344d {+08h 09m 23s} (current),
                 121.589d {+08h 06m 21s} (1950)
GRB_DEC:         -22.283d {-22d 16' 59"} (J2000),
                 -22.341d {-22d 20' 26"} (current),
                 -22.136d {-22d 08' 10"} (1950)
GRB_ERROR:       4.42 [deg radius, statistical plus systematic]
GRB_INTEN:       861 [cnts/sec]
DATA_SIGNIF:     41.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.60
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         83.13 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      133.50d {+08h 54m 01s}  +19.40d {+19d 24' 12"}
MOON_DIST:        43.14 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      241.56,  5.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.90,-41.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.18,5.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:15:07 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     579251669
GRB_RA:          126.333d {+08h 25m 20s} (J2000),
                 126.541d {+08h 26m 10s} (current),
                 125.796d {+08h 23m 11s} (1950)
GRB_DEC:         -24.717d {-24d 43' 00"} (J2000),
                 -24.781d {-24d 46' 50"} (current),
                 -24.553d {-24d 33' 09"} (1950)
GRB_ERROR:       6.12 [deg radius, statistical plus systematic]
GRB_INTEN:       297 [cnts/sec]
DATA_SIGNIF:     26.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         255.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.90
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         87.61 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      133.50d {+08h 54m 01s}  +19.40d {+19d 24' 13"}
MOON_DIST:        44.70 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      245.74,  7.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      136.82,-42.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.18,5.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:15:47 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     579251669
GRB_RA:          125.100d {+08h 20m 24s} (J2000),
                 125.309d {+08h 21m 14s} (current),
                 124.561d {+08h 18m 15s} (1950)
GRB_DEC:         -23.970d {-23d 58' 11"} (J2000),
                 -24.032d {-24d 01' 55"} (current),
                 -23.811d {-23d 48' 39"} (1950)
GRB_ERROR:       1.21 [deg radius, statistical only]
DATA_SIGNIF:     19.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         258.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         86.29 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      133.51d {+08h 54m 02s}  +19.40d {+19d 24' 09"}
MOON_DIST:        44.16 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      244.48,  7.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      135.06,-42.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_579251669.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(24.0<100sec) coincident with the SWIFT_BAT event (trignum=903158).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:15:58 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     579251669
GRB_RA:          124.590d {+08h 18m 22s} (J2000),
                 124.799d {+08h 19m 12s} (current),
                 124.050d {+08h 16m 12s} (1950)
GRB_DEC:         -23.620d {-23d 37' 11"} (J2000),
                 -23.681d {-23d 40' 52"} (current),
                 -23.463d {-23d 27' 46"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     25.70 [sigma]
DATA_INTERVAL:   9.216 [sec]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         260.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 39"}
SUN_DIST:         85.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      133.51d {+08h 54m 03s}  +19.40d {+19d 24' 08"}
MOON_DIST:        43.91 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      243.93,  6.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.32,-41.88 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_579251669.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(24.0<100sec) coincident with the SWIFT_BAT event (trignum=903158).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 11 May 19 07:23:39 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     579251669
GRB_RA:          123.760d {+08h 15m 02s} (J2000),
                 123.968d {+08h 15m 52s} (current),
                 123.224d {+08h 12m 54s} (1950)
GRB_DEC:         -24.260d {-24d 15' 35"} (J2000),
                 -24.320d {-24d 19' 11"} (current),
                 -24.106d {-24d 06' 22"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26064.36 SOD {07:14:24.36} UT
GRB_PHI:         262.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        47.90d {+03h 11m 35s}  +17.83d {+17d 49' 44"}
SUN_DIST:         85.26 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      133.59d {+08h 54m 22s}  +19.39d {+19d 23' 16"}
MOON_DIST:        44.70 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      244.04,  5.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.60,-42.72 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_locplot_all_bn190511302.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(24.0<100sec) coincident with the SWIFT_BAT event (trignum=903158).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:17:32 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     903158,   Seg_Num: 0
GRB_RA:          126.4452d {+08h 25m 46.8s} (J2000),
                 126.6612d {+08h 26m 38.6s} (current),
                 125.8873d {+08h 23m 32.9s} (1950)
GRB_DEC:         -20.2601d {-20d 15' 36.3"} (J2000),
                 -20.3243d {-20d 19' 27.4"} (current),
                 -20.0958d {-20d 05' 44.8"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       47 [cnts]
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26211.20 SOD {07:16:51.20} UT,   122.9 [sec] since BAT Trigger Time
CENTROID_X:      324.83,  raw= 325  [pixels]
CENTROID_Y:      309.97,  raw= 310  [pixels]
ROLL:            290.73 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   27.28
GRB_POS_XRT_Z:   43.45
IMAGE_URL:       sw00903158000msxps_rw.img
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 40"}
SUN_DIST:         86.13 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.53d {+08h 54m 07s}  +19.40d {+19d 23' 57"}
MOON_DIST:        40.29 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.07, 10.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      135.14,-38.16 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:17:23 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     903158,   Seg_Num: 0
GRB_RA:          126.4452d {+08h 25m 46.84s} (J2000),
                 126.6612d {+08h 26m 38.68s} (current),
                 125.8873d {+08h 23m 32.94s} (1950)
GRB_DEC:         -20.2601d {-20d 15' 36.3"} (J2000),
                 -20.3243d {-20d 19' 27.4"} (current),
                 -20.0958d {-20d 05' 44.8"} (1950)
GRB_ERROR:       5.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.43e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.85 [sigma]
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26211.20 SOD {07:16:51.20} UT,   122.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.18 261.64 243.64
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 40"}
SUN_DIST:         86.13 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.53d {+08h 54m 06s}  +19.40d {+19d 23' 58"}
MOON_DIST:        40.29 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.07, 10.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      135.14,-38.16 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.21 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:17:36 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     903158,   Seg_Num: 0
GRB_RA:          126.4452d {+08h 25m 46.8s} (J2000),
                 126.6612d {+08h 26m 38.6s} (current),
                 125.8873d {+08h 23m 32.9s} (1950)
GRB_DEC:         -20.2601d {-20d 15' 36.3"} (J2000),
                 -20.3243d {-20d 19' 27.4"} (current),
                 -20.0958d {-20d 05' 44.8"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       47 [cnts]
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26211.20 SOD {07:16:51.20} UT,   122.9 [sec] since BAT Trigger Time
CENTROID_X:      324.83,  raw= 325  [pixels]
CENTROID_Y:      309.97,  raw= 310  [pixels]
ROLL:            290.73 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   27.28
GRB_POS_XRT_Z:   43.45
IMAGE_URL:       sw00903158000msxps_rw.img
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 40"}
SUN_DIST:         86.13 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.53d {+08h 54m 07s}  +19.40d {+19d 23' 57"}
MOON_DIST:        40.29 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.07, 10.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      135.14,-38.16 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:18:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     903158,   Seg_Num: 0
GRB_RA:          126.436d {+08h 25m 45s} (J2000),
                 126.652d {+08h 26m 37s} (current),
                 125.878d {+08h 23m 31s} (1950)
GRB_DEC:         -20.242d {-20d 14' 30"} (J2000),
                 -20.306d {-20d 18' 21"} (current),
                 -20.078d {-20d 04' 39"} (1950)
GRB_DATE:        18614 TJD;   131 DOY;   19/05/11
GRB_TIME:        26088.28 SOD {07:14:48.28} UT
TRIGGER_INDEX:   301
GRB_PHI:          -4.31 [deg]
GRB_THETA:        56.33 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     38.70 [sigma]
IMAGE_SIGNIF:    9.72 [sigma]
LC_URL:          sw00903158000msb.lc
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 41"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.54d {+08h 54m 10s}  +19.40d {+19d 23' 49"}
MOON_DIST:        40.27 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.05, 10.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      135.12,-38.15 [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 = 216.17,-15.32 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:19:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.437d {+08h 25m 45s} (J2000)
POINT_DEC:       -20.248d {-20d 14' 53"} (J2000)
POINT_ROLL:      290.727d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26219.68 SOD {07:16:59.68} UT,   131.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.215
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00903158000msufc0131.fits
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 42"}
SUN_DIST:         86.12 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.55d {+08h 54m 13s}  +19.39d {+19d 23' 41"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.15 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:20:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.437d {+08h 25m 45s} (J2000)
POINT_DEC:       -20.248d {-20d 14' 53"} (J2000)
POINT_ROLL:      290.727d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26219.68 SOD {07:16:59.68} UT,   131.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.215
N_STARS:         190
X_OFFSET:        520 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1479 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00903158000msufc0131.fits
SUN_POSTN:        47.89d {+03h 11m 34s}  +17.83d {+17d 49' 42"}
SUN_DIST:         86.12 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.55d {+08h 54m 13s}  +19.39d {+19d 23' 39"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.15 [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 11 May 19 07:21:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.437d {+08h 25m 45s} (J2000)
POINT_DEC:       -20.248d {-20d 14' 53"} (J2000)
ROLL:            290.727d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26219.68 SOD {07:16:59.68} UT,   131.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     579251842
X_OFFSET:        703 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       863
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00903158000msuni0154.fits
SUN_POSTN:        47.89d {+03h 11m 35s}  +17.83d {+17d 49' 43"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.57d {+08h 54m 16s}  +19.39d {+19d 23' 31"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.15 [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 11 May 19 07:21:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.437d {+08h 25m 45s} (J2000)
POINT_DEC:       -20.248d {-20d 14' 53"} (J2000)
ROLL:            290.727d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26219.68 SOD {07:16:59.68} UT,   131.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     579251842
X_OFFSET:        703 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       863
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00903158000msuni0154.fits
SUN_POSTN:        47.89d {+03h 11m 35s}  +17.83d {+17d 49' 43"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.57d {+08h 54m 17s}  +19.39d {+19d 23' 29"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.15 [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 11 May 19 07:22:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.435d {+08h 25m 44s} (J2000)
POINT_DEC:       -20.251d {-20d 15' 02"} (J2000)
POINT_ROLL:      290.728d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26378.79 SOD {07:19:38.79} UT,   290.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.279
N_STARS:         151
X_OFFSET:        383 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1342 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00903158000msufc0290.fits
SUN_POSTN:        47.90d {+03h 11m 35s}  +17.83d {+17d 49' 44"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.58d {+08h 54m 20s}  +19.39d {+19d 23' 20"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 19 07:23:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.435d {+08h 25m 44s} (J2000)
POINT_DEC:       -20.251d {-20d 15' 02"} (J2000)
POINT_ROLL:      290.728d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26378.79 SOD {07:19:38.79} UT,   290.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.279
N_STARS:         151
X_OFFSET:        383 [pixels]
Y_OFFSET:        563 [pixels]
X_MAX:           1342 [pixels]
Y_MAX:           1522 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00903158000msufc0290.fits
SUN_POSTN:        47.90d {+03h 11m 35s}  +17.83d {+17d 49' 44"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.59d {+08h 54m 21s}  +19.39d {+19d 23' 18"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.16 [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 11 May 19 07:24:23 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.435d {+08h 25m 44s} (J2000)
POINT_DEC:       -20.251d {-20d 15' 02"} (J2000)
ROLL:            290.728d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26378.79 SOD {07:19:38.79} UT,   290.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     579252001
X_OFFSET:        703 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       863
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00903158000msuni0313.fits
SUN_POSTN:        47.90d {+03h 11m 35s}  +17.83d {+17d 49' 45"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.60d {+08h 54m 23s}  +19.39d {+19d 23' 11"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.16 [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 11 May 19 07:24:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     903158,   Seg_Num: 0
POINT_RA:        126.435d {+08h 25m 44s} (J2000)
POINT_DEC:       -20.251d {-20d 15' 02"} (J2000)
ROLL:            290.728d
IMG_START_DATE:  18614 TJD;   131 DOY;   19/05/11
IMG_START_TIME:  26378.79 SOD {07:19:38.79} UT,   290.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     579252001
X_OFFSET:        703 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       863
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00903158000msuni0313.fits
SUN_POSTN:        47.90d {+03h 11m 35s}  +17.83d {+17d 49' 45"}
SUN_DIST:         86.11 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      133.60d {+08h 54m 24s}  +19.39d {+19d 23' 09"}
MOON_DIST:        40.28 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      242.06, 10.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      135.12,-38.16 [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 #24471
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:14:24 UT on 11 May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190511A (trigger 579251669.35821 / 190511302).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 123.8, Dec = -24.3 (J2000 degrees, equivalent to J2000 08h 15m, -24d 18'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 19.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_skymap_all_bn190511302.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/bn190511302/quicklook/glg_healpix_all_bn190511302.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190511302/quicklook/glg_lc_medres34_bn190511302.gif
GCN Circular #24472
M. G. Bernardini (INAF-OAB), H. A. Krimm (NSF/USRA), N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester), B. Sbarufatti (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 07:14:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190511A (trigger=903158). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 126.436, -20.242 which is
```
   RA(J2000) = 08h 25m 45s
   Dec(J2000) = -20d 14' 30"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 07:16:51.2 UT, 122.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 126.44482, -20.25978 which is equivalent to:
```
   RA(J2000)  = 08h 25m 46.76s
   Dec(J2000) = -20d 15' 35.2"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 70 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. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 9.43e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 95 seconds with the U filter starting 290 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #24481
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 411 s of XRT Photon Counting mode data and 2 UVOT images for GRB 190511A, 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 = 126.44426, -20.25935 which is equivalent to:
```
RA (J2000): 08h 25m 46.62s
Dec (J2000): -20d 15' 33.7"
```
with an uncertainty of 2.0 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #24482
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 07:14:24.36 UT on 11 May 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190511A (trigger 579251669 / 190511302), which was also detected by the Swift/BAT (Bernardiniet al. 2019, GCN 24472) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 23.7 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of a multipeaked emission episode with a duration (T90) of about 28 s (50-300 keV). The time-averaged spectrum from T0-2.048 s to T0+31.745 s is best fit by a Band function with Epeak = 147.8 +/- 7.2 keV, alpha = -0.58 +/- 0.05, and beta = -2.4 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (2.21 +/- 0.05)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+24.1924 s in the 10-1000 keV band is 14.2 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #24483
M. Axelsson (KTH and Stockholm Univ.), F. Longo (Univ. and INFN Trieste), M. Arimoto (Kanazawa Univ.) and F. Dirirsa (Univ. of Johannesburg) report on behalf of the Fermi-LAT team:
On May 11, 2019, Fermi-LAT detected high-energy emission from GRB 190511A, which was also detected by Fermi-GBM (trigger 579251669 / 190511302; GCN 24482) and Swift (GCNs 24472 and 24481).
The best LAT on-ground location is found to be
RA, Dec 126.36, -20.25 (degrees, J2000)
with an error radius of 0.2 deg (90% containment, statistical error only). This was 24 deg from the LAT boresight at the time of the GBM trigger:
T0 = 07:14:24.36 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance and consistent with the Swift location.
The photon flux above 100 MeV in the time interval 0-1400s after the GBM trigger is 3.6e-6 ph/cm2/s.
The estimated photon index above 100 MeV is -2.0 +/- 0.2.
The Fermi-LAT point of contact for this burst is Feraol Dirirsa (fdirirsa@uj.ac.za).
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 #24492
Daniele B. Malesani (DAWN/NBI and DARK/NBI), Dong Xu (NAOC/CAS), Joonas Viuho (NOT and DAWN/NBI) report on behalf of a larger collaboration:
We observed the field of the Swift and Fermi GRB 190511A (Bernardini et al., GCN 24472; von Kienlin, GCN 24482; Axelsson et al., GCN 24483) using the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera. Observations started in twilight and were carried out at high airmass due to the poor target visibility.
Just outside the enhanced XRT error position (Goad et al., GCN 24481), we clearly detect a source not visible in the archival Pan-STARRS images of the same area, which we suggest to be the optical afterglow of GRB 190511A. Its coordinates are (J2000):
```
RA = 08:25:46.46
Dec = -20:15:33.4
```
Using nearby stars from the Pan-STARRS survey as calibrators, we measure for the afterglow a magnitude r = 20.89 +- 0.09 AB, at a mean epoch May 11.8648 UT (13.51 hr after the trigger).
GCN Circular #24494
N. P. M. Kuin (UCL-MSSL), M. de Pasquale (U. of Istanbul) and M. G. Bernardini (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190511A 131 s after the BAT trigger (Bernardini et al., GCN Circ. 24472). A source consistent with the XRT position (Goad et al. GCN Circ. 24481) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  08:25:46.44 = 126.44350 (deg.)
    Dec (J2000) = -20:15:33.6  = -20.25933 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
There is a catalogued star at a distance of 1.3 arcsec. The extrapolated brightness using the SED from the Vizier photometry tool ( http://cdsportal.u-strasbg.fr/gadgets/ifr?url=http://cdsportal.unistra.fr/widgets/SED_plotter.xml&SED_plot_object=126.442680%2C%20-20.259685&SED_plot_radius=2 ) shows a brightness consistent with that of the white count rate seen at several ks after the trigger. We subtract here therefore the late time count rate in the following preliminary UVOT photometry of this GRB, knowing that this has to be refined using truely late time data. Where we did not have a late time measurement yet available, the photometry will be reported in due time.
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

white              131          281          147         16.0 +/- 0.1
b                 5684         5884          197         21.6 +/- 0.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).
The afterglow was also discovered by NOT (Malasani et al. GCN Circ. 24492).
GCN Circular #24498
K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M.G. Bernadini (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester) and M.G. Bernardini report on behalf of the Swift-XRT team:
We have analysed 4.0 ks of XRT data for GRB 190511A (Bernardini et al. GCN Circ. 24472), from 129 s to 46.3 ks after the BAT trigger. The data comprise 188 s 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. 24481).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.177 (+0.031, -0.028).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.07 (+0.08, -0.07). The best-fitting absorption column is consistent with the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.12 (+0.24, -0.23) and a best-fitting absorption column of 1.6 (+0.7, -0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (4.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+0.7, -0.5) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.12 (+0.24, -0.23)
```
If the light curve continues to decay with a power-law decay index of 1.177, the count rate at T+24 hours will be 9.3 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.0 x 10^-13 (4.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00903158.
This circular is an official product of the Swift-XRT team.
GCN Circular #24502
S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), 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):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190511Atrigger #903158) (Bernardini, et al., GCN Circ. 24472). The BAT ground-calculated position is RA, Dec = 126.443, -20.252 deg which is
```
  RA(J2000)  =  08h 25m 46.2s 
  Dec(J2000) = -20d 15' 05.6" 
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%.
The mask-weighted light curve shows a complex, multi-peaked structure, starting at about T-25 sec, peaking at T+0 sec and declining to background by T+10 sec. The spacecraft slewed away from the burst position by T+475 sec. T90 (15-350 keV) is 27.7 +- 2.4 sec (estimated error including systematics).
The time-averaged spectrum from T-24.27 to T+6.88 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.19 +- 0.10. The fluence in the 15-150 keV band is 7.4 +- 0.5 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.36 sec in the 15-150 keV band is 6.2 +- 1.2 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/903158/BA/
GCN Circular #24534
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 190511A (Swift-BAT detection: Bernardini et al., GCN Circ. 24472, Barthelmy et al., GCN Circ. 24502; Fermi-GBM observation: Kienlin et al., GCN Circ. 24482; Fermi-LAT detection: Axelsson et al., GCN Circ. 24483) triggered Konus-Wind at T0=26067.524 s UT (07:14:27.524).
The burst light curve shows a multipeaked structure which started at ~T0-2.6 s and had a total duration of ~31.8 s. The emission is seen up to ~2 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.93(-0.11,+0.12)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+21.936 s, of 3.81(-0.90,+0.91)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+33.024 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.69(-0.16,+0.17) and Ep = 185(-15,+18) keV (chi2 = 49/58 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.4 (chi2 = 48/57 dof)
The spectrum near the maximum count rate (measured from T0+16.640 to T0+24.832 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model with alpha = -0.52(-0.23,+0.26) and Ep = 193(-20,+26) keV (chi2 = 53/58 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.0 (chi2 = 53/57 dof)
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190511_T26067/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #24587
N. P. M. Kuin (UCL-MSSL) and M. G. Bernardini (INAF-OAB) report on behalf of the Swift/UVOT team:
In GCN Circ. 24494 (Kuin and Bernardini) we described how we detect the afterglow of the GRB, but that the photometry was affected by an object located at a distance of 1.3 arcsec. Further Swift observations show that the uv-optical afterglow was no longer detected in white beyond 26ks after the trigger. Data that were taken after that time are considered template observations that provide the background contribution to the photometry.
The template net corrected count rates, with instrumental effects removed, are found to be as follows for a 3" radius circular aperture at the location of the GRB as reported in GCN 24494: White = 1.066 +/- 0.031 c/s; u = 0.149 +/- 0.016 c/s; b = 0.509 +/- 0.061 c/s; uvw2 = 0.011 +/- 0.011 c/s; v = 0.272 +/- 0.042 c/s; while uvm2 and uvw1 were not observed until after the afterglow became too faint.
After removal of the template contribution, the following preliminary detections and 3-sigma upper limits were determined from the count rates using the zeropoints in the UVOT photometric system (Poole et al. 2008, MNRAS 383, 627; Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the image mode exposures:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              131          281          147          15.96 +/- 0.05
u                  290          385           93          19.62 +/- 0.42
b                 5684         5884          197          > 20.13
white             5888         6088          197          20.61 +/- 0.37
uvw2              6094        11850          518          > 17.81
v                17150        17450          300          > 19.35
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 17-May-2019 [Disclaimer]