Gamma-ray Burst 190311A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:23:50 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.102d {+14h 08m 24s} (J2000),
                 212.271d {+14h 09m 05s} (current),
                 211.661d {+14h 06m 39s} (1950)
GRB_DEC:         +53.519d {+53d 31' 10"} (J2000),
                 +53.429d {+53d 25' 44"} (current),
                 +53.756d {+53d 45' 21"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2588 [cnts]    Image_Peak=160 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       15260 [cnts]
BKG_TIME:        51801.44 SOD {14:23:21.44} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18553 TJD;    70 DOY;   19/03/11
GRB_TIME:        51813.67 SOD {14:23:33.67} UT
GRB_PHI:         -13.47 [deg]
GRB_THETA:        33.03 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.41 [sigma]
IMAGE_SIGNIF:    8.45 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -1  +0  +0 +50  +0 
SUN_POSTN:       351.47d {+23h 25m 54s}   -3.68d {-03d 40' 35"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.29d {+03h 01m 09s}  +12.15d {+12d 08' 48"}
MOON_DIST:       113.49 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.84, 60.02 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.60, 59.70 [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 = 126.85,17.97 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=574007022).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:24:07 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     574007022
GRB_RA:          173.950d {+11h 35m 48s} (J2000),
                 174.220d {+11h 36m 53s} (current),
                 173.241d {+11h 32m 58s} (1950)
GRB_DEC:         +65.367d {+65d 22' 00"} (J2000),
                 +65.260d {+65d 15' 38"} (current),
                 +65.643d {+65d 38' 36"} (1950)
GRB_ERROR:       26.43 [deg radius, statistical plus systematic]
GRB_INTEN:       67 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18553 TJD;    70 DOY;   19/03/11
GRB_TIME:        51817.60 SOD {14:23:37.60} UT
GRB_PHI:         236.00 [deg]
GRB_THETA:       110.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      84%  GRB
2nd_MOST_LIKELY:  13%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       351.47d {+23h 25m 54s}   -3.68d {-03d 40' 35"}
SUN_DIST:        118.38 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:       45.29d {+03h 01m 10s}  +12.15d {+12d 08' 51"}
MOON_DIST:        93.78 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      135.05, 49.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      135.88, 54.74 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190311600/quicklook/glg_lc_medres34_bn190311600.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 57.77,23.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=892607).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:24:16 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     574007022
GRB_RA:          162.620d {+10h 50m 29s} (J2000),
                 162.920d {+10h 51m 41s} (current),
                 161.832d {+10h 47m 20s} (1950)
GRB_DEC:         +59.870d {+59d 52' 12"} (J2000),
                 +59.768d {+59d 46' 05"} (current),
                 +60.135d {+60d 08' 06"} (1950)
GRB_ERROR:       11.64 [deg radius, statistical only]
DATA_SIGNIF:     5.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18553 TJD;    70 DOY;   19/03/11
GRB_TIME:        51817.60 SOD {14:23:37.60} UT
GRB_PHI:         233.00 [deg]
GRB_THETA:       103.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       351.47d {+23h 25m 54s}   -3.68d {-03d 40' 35"}
SUN_DIST:        123.52 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:       45.29d {+03h 01m 10s}  +12.15d {+12d 08' 53"}
MOON_DIST:        92.66 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      146.78, 51.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.85, 47.21 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190311600/quicklook/glg_lc_medres34_bn190311600.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_574007022.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=892607).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:25:38 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.0638d {+14h 08m 15.3s} (J2000),
                 212.2330d {+14h 08m 55.9s} (current),
                 211.6227d {+14h 06m 29.4s} (1950)
GRB_DEC:         +53.5013d {+53d 30' 04.6"} (J2000),
                 +53.4108d {+53d 24' 39.0"} (current),
                 +53.7378d {+53d 44' 16.0"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51894.04 SOD {14:24:54.04} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      340.63,  raw= 341  [pixels]
CENTROID_Y:      299.36,  raw= 299  [pixels]
ROLL:            48.69 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   2.26
GRB_POS_XRT_Z:   80.71
IMAGE_URL:       sw00892607000msxps_rw.img
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 33"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.30d {+03h 01m 13s}  +12.15d {+12d 09' 06"}
MOON_DIST:       113.49 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.86, 60.05 [deg] galactic lon,lat of the burst
ECL_COORDS:      176.59, 59.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:25:42 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.0638d {+14h 08m 15.3s} (J2000),
                 212.2330d {+14h 08m 55.9s} (current),
                 211.6227d {+14h 06m 29.4s} (1950)
GRB_DEC:         +53.5013d {+53d 30' 04.6"} (J2000),
                 +53.4108d {+53d 24' 39.0"} (current),
                 +53.7378d {+53d 44' 16.0"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51894.04 SOD {14:24:54.04} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      340.63,  raw= 341  [pixels]
CENTROID_Y:      299.36,  raw= 299  [pixels]
ROLL:            48.69 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   2.26
GRB_POS_XRT_Z:   80.71
IMAGE_URL:       sw00892607000msxps_rw.img
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 33"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.31d {+03h 01m 13s}  +12.15d {+12d 09' 07"}
MOON_DIST:       113.49 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.86, 60.05 [deg] galactic lon,lat of the burst
ECL_COORDS:      176.59, 59.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:28:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.093d {+14h 08m 22s} (J2000)
POINT_DEC:       +53.516d {+53d 30' 56"} (J2000)
POINT_ROLL:      48.691d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51901.03 SOD {14:25:01.03} UT,   87.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.469
N_STARS:         50
X_OFFSET:        528 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00892607000msufc0087.fits
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 31"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.33d {+03h 01m 19s}  +12.16d {+12d 09' 35"}
MOON_DIST:       113.47 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:29:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.093d {+14h 08m 22s} (J2000)
POINT_DEC:       +53.516d {+53d 30' 56"} (J2000)
ROLL:            48.691d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51901.03 SOD {14:25:01.03} UT,   87.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574007123
X_OFFSET:        664 [pixels]
Y_OFFSET:        962 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1122
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0110.fits
SUN_POSTN:       351.48d {+23h 25m 55s}   -3.68d {-03d 40' 29"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.34d {+03h 01m 22s}  +12.16d {+12d 09' 47"}
MOON_DIST:       113.46 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:30:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.093d {+14h 08m 22s} (J2000)
POINT_DEC:       +53.516d {+53d 30' 56"} (J2000)
ROLL:            48.691d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51901.03 SOD {14:25:01.03} UT,   87.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574007123
X_OFFSET:        664 [pixels]
Y_OFFSET:        962 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1122
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0110.fits
SUN_POSTN:       351.48d {+23h 25m 55s}   -3.68d {-03d 40' 29"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.34d {+03h 01m 22s}  +12.16d {+12d 09' 50"}
MOON_DIST:       113.46 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [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:     Mon 11 Mar 19 14:25:32 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.0638d {+14h 08m 15.31s} (J2000),
                 212.2330d {+14h 08m 55.91s} (current),
                 211.6227d {+14h 06m 29.43s} (1950)
GRB_DEC:         +53.5013d {+53d 30' 04.6"} (J2000),
                 +53.4108d {+53d 24' 39.0"} (current),
                 +53.7378d {+53d 44' 16.0"} (1950)
GRB_ERROR:       6.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.45e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.79 [sigma]
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51894.04 SOD {14:24:54.04} UT,   80.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.70 237.22 261.79 243.61
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 34"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.30d {+03h 01m 13s}  +12.15d {+12d 09' 05"}
MOON_DIST:       113.49 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.86, 60.05 [deg] galactic lon,lat of the burst
ECL_COORDS:      176.59, 59.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.74 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:27:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.102d {+14h 08m 24s} (J2000),
                 212.271d {+14h 09m 05s} (current),
                 211.661d {+14h 06m 39s} (1950)
GRB_DEC:         +53.519d {+53d 31' 10"} (J2000),
                 +53.429d {+53d 25' 44"} (current),
                 +53.756d {+53d 45' 21"} (1950)
GRB_DATE:        18553 TJD;    70 DOY;   19/03/11
GRB_TIME:        51813.67 SOD {14:23:33.67} UT
TRIGGER_INDEX:   137
GRB_PHI:         -13.47 [deg]
GRB_THETA:        33.03 [deg]
DELTA_TIME:      57.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.41 [sigma]
IMAGE_SIGNIF:    8.45 [sigma]
LC_URL:          sw00892607000msb.lc
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 31"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.32d {+03h 01m 18s}  +12.16d {+12d 09' 29"}
MOON_DIST:       113.47 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.84, 60.02 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.60, 59.70 [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 = 126.85,17.97 [deg].  
COMMENTS:        The 2nd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:28:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.093d {+14h 08m 22s} (J2000)
POINT_DEC:       +53.516d {+53d 30' 56"} (J2000)
POINT_ROLL:      48.691d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51901.03 SOD {14:25:01.03} UT,   87.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.469
N_STARS:         50
X_OFFSET:        528 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00892607000msufc0087.fits
SUN_POSTN:       351.48d {+23h 25m 54s}   -3.68d {-03d 40' 31"}
SUN_DIST:        120.11 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.33d {+03h 01m 19s}  +12.16d {+12d 09' 33"}
MOON_DIST:       113.47 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:36:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 01"} (J2000)
POINT_ROLL:      48.687d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52113.62 SOD {14:28:33.62} UT,   300.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.340
N_STARS:         13
X_OFFSET:        344 [pixels]
Y_OFFSET:        642 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00892607000msufc0299.fits
SUN_POSTN:       351.48d {+23h 25m 56s}   -3.67d {-03d 40' 23"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.40d {+03h 01m 36s}  +12.18d {+12d 10' 56"}
MOON_DIST:       113.44 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:36:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 01"} (J2000)
POINT_ROLL:      48.687d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52113.62 SOD {14:28:33.62} UT,   300.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.340
N_STARS:         13
X_OFFSET:        344 [pixels]
Y_OFFSET:        642 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00892607000msufc0299.fits
SUN_POSTN:       351.48d {+23h 25m 56s}   -3.67d {-03d 40' 22"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.40d {+03h 01m 36s}  +12.18d {+12d 10' 58"}
MOON_DIST:       113.43 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:37:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 01"} (J2000)
ROLL:            48.687d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52113.62 SOD {14:28:33.62} UT,   300.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     574007336
X_OFFSET:        664 [pixels]
Y_OFFSET:        962 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1122
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0322.fits
SUN_POSTN:       351.48d {+23h 25m 56s}   -3.67d {-03d 40' 21"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.41d {+03h 01m 38s}  +12.19d {+12d 11' 07"}
MOON_DIST:       113.43 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:38:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 01"} (J2000)
ROLL:            48.687d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52113.62 SOD {14:28:33.62} UT,   300.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     574007336
X_OFFSET:        664 [pixels]
Y_OFFSET:        962 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       824
Y_GRB_POS:       1122
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0322.fits
SUN_POSTN:       351.48d {+23h 25m 56s}   -3.67d {-03d 40' 21"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.41d {+03h 01m 39s}  +12.19d {+12d 11' 10"}
MOON_DIST:       113.43 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [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:     Mon 11 Mar 19 14:37:21 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.0648d {+14h 08m 15.55s} (J2000),
                 212.2340d {+14h 08m 56.15s} (current),
                 211.6237d {+14h 06m 29.67s} (1950)
GRB_DEC:         +53.5007d {+53d 30' 02.5"} (J2000),
                 +53.4102d {+53d 24' 36.8"} (current),
                 +53.7372d {+53d 44' 13.9"} (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:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51982.00 SOD {14:26:22.00} UT,   168.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       351.48d {+23h 25m 56s}   -3.67d {-03d 40' 22"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.40d {+03h 01m 37s}  +12.18d {+12d 11' 02"}
MOON_DIST:       113.45 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.86, 60.05 [deg] galactic lon,lat of the burst
ECL_COORDS:      176.59, 59.67 [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 Circular #23946
E. Troja (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), M. J. Moss (George Washington University), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 14:23:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190311A (trigger=892607). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 212.102, +53.519 which is
```
   RA(J2000) = 14h 08m 24s
   Dec(J2000) = +53d 31' 10"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). From the available data, the BAT light curve showed a single-peaked structure with duration of at least 10 sec. However, due to a data gap from ~T+10 s to ~ T+ 110 s, there might be additional emission in that time interval. The peak count rate was ~1700 counts/sec (15-350 keV), at ~ 0 sec after the trigger.
The XRT began observing the field at 14:24:54.0 UT, 80.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 212.0649, 53.5007 which is equivalent to:
```
   RA(J2000)  = 14h 08m 15.58s
   Dec(J2000) = +53d 30' 02.7"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 103 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 in excess of the Galactic value (1.17 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 5.1 (+3.27/-2.92) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 5.45e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 85 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	14:08:15.65 = 212.06522
  DEC(J2000) = +53:30:03.0  =  53.50084
```
with a 90%-confidence error radius of about 0.60 arc sec. This position is 0.85 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.47 with a 1-sigma error of about 0.12. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:44:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 02"} (J2000)
POINT_ROLL:      48.686d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52691.64 SOD {14:38:11.64} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.374
N_STARS:         82
X_OFFSET:        104 [pixels]
Y_OFFSET:        402 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1841 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00892607000msufc0877.fits
SUN_POSTN:       351.49d {+23h 25m 57s}   -3.67d {-03d 40' 15"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.47d {+03h 01m 52s}  +12.20d {+12d 12' 13"}
MOON_DIST:       113.40 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:44:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 02"} (J2000)
POINT_ROLL:      48.686d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52691.64 SOD {14:38:11.64} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.374
N_STARS:         82
X_OFFSET:        104 [pixels]
Y_OFFSET:        402 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1841 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00892607000msufc0877.fits
SUN_POSTN:       351.49d {+23h 25m 57s}   -3.67d {-03d 40' 15"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.47d {+03h 01m 52s}  +12.20d {+12d 12' 15"}
MOON_DIST:       113.40 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 14:45:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 02"} (J2000)
ROLL:            48.686d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52691.64 SOD {14:38:11.64} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574007914
X_OFFSET:        663 [pixels]
Y_OFFSET:        961 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       823
Y_GRB_POS:       1121
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0900.fits
SUN_POSTN:       351.49d {+23h 25m 57s}   -3.67d {-03d 40' 14"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.48d {+03h 01m 55s}  +12.21d {+12d 12' 26"}
MOON_DIST:       113.40 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [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:     Mon 11 Mar 19 14:45:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     892607,   Seg_Num: 0
POINT_RA:        212.089d {+14h 08m 21s} (J2000)
POINT_DEC:       +53.517d {+53d 31' 02"} (J2000)
ROLL:            48.686d
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  52691.64 SOD {14:38:11.64} UT,   878.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574007914
X_OFFSET:        663 [pixels]
Y_OFFSET:        961 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       823
Y_GRB_POS:       1121
BINNING_INDEX:   1
IM_URL:          sw00892607000msuni0900.fits
SUN_POSTN:       351.49d {+23h 25m 57s}   -3.67d {-03d 40' 13"}
SUN_DIST:        120.12 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.48d {+03h 01m 55s}  +12.21d {+12d 12' 28"}
MOON_DIST:       113.40 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.85, 60.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      176.59, 59.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Mar 19 15:28:18 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     892607,   Seg_Num: 0
GRB_RA:          212.0653d {+14h 08m 15.67s} (J2000),
                 212.2345d {+14h 08m 56.27s} (current),
                 211.6242d {+14h 06m 29.79s} (1950)
GRB_DEC:         +53.5008d {+53d 30' 02.8"} (J2000),
                 +53.4103d {+53d 24' 37.2"} (current),
                 +53.7373d {+53d 44' 14.2"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         19.45 +/- 0.16 [mag]
FILTER:          10, White
IMG_START_DATE:  18553 TJD;    70 DOY;   19/03/11
IMG_START_TIME:  51898.00 SOD {14:24:58.00} UT,   84.3 [sec] since BAT Trigger Time
SUN_POSTN:       351.52d {+23h 26m 04s}   -3.66d {-03d 39' 32"}
SUN_DIST:        120.14 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.84d {+03h 03m 22s}  +12.32d {+12d 19' 26"}
MOON_DIST:       113.24 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       99.86, 60.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.59, 59.67 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 3.6 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #23947
A. Pozanenko (IKI), E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), S. Belkin (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 190311A (Troja et al. GCN 23946) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Mar. 11 (UT) 14:39:17. We clearly detected the candidate in optical afterglow (Troja et al. GCN 23946). Coordinates of the optical transient are (J2000) 14:08:15.74 +53:30:03.1 with uncertainty of 0.5 arcsec in both coordinates, which correspond to the coordinates obtained in GCN 23946. Preliminary photometry of the afterglow in R-filter is following.
```
t-T0_mid(d) t-T0_mid(min) R_mag err
0.01111 16.0 19.22 0.11
0.01146 16.5 19.25 0.10
0.01180 17.0 19.50 0.11
0.01215 17.5 19.23 0.10
0.01250 18.0 19.47 0.12
0.01285 18.5 19.46 0.10
0.01348 19.4 19.50 0.08
0.01417 20.4 19.62 0.08
0.01487 21.4 19.55 0.09
0.01556 22.4 19.58 0.08
0.01626 23.4 19.56 0.09
0.01695 24.4 19.62 0.09
0.01765 25.4 19.79 0.10
0.01875 27.0 19.83 0.06
0.02014 29.0 19.83 0.06
```
Photometry is based on the SDSS-DR12 stars (Lupton transformations)
```
SDSS-DR12_id	        R
J140819.68+532900.1	17.09
J140818.11+532934.7	15.19
J140809.64+533055.9	16.97
J140807.35+533116.9	16.11
```
The optical transient is fading and we can confirm the optical afterglow of GRB 190311A.
GCN Circular #23948
Z.P. Zhu, D. Xu, B.Y. Yu (NAOC) report on behalf of larger collaboration:
We observed the field of GRB 190311A (Troja et al., GCN 23946) using the robotic NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 14:25:14 UT on 2019-03-11, i.e., 101 sec after the BAT trigger. A series of 40 s, 60 s , 90 s, 300 s R-band frames were obtained, and photometry is still ongoing.
An uncatalogued optical source is detected at coordinates
```
R.A. (J2000) = 14:08:15.71
Dec. (J2000) = +53:30:01.7
```
with an uncertainty radius ~0.3 arcsec, being consistent with Swift/UVOT position (Troja et al., GCN 23946). The source has m(R) ~ 19.7 mag at 413 s post-burst, and is fading. We conclude that the source is the optical afterglow of the burst.

GCN Circular #23949
E. Gorbovskoy, V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov, A.Kuznetsov, P.Balanutsa, A. Chasovnikov, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department),
O. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova (Applied Physics Institute, Irkutsk State University),
V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University),
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
R. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE)
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 GRB190311.6 (Troja et al., 23946) 55 sec after notice time and 66 sec after trigger time at 2019-03-11 14:24:45 UT. On our third (30 s exposure) set we found optical transient within SWIFT error-box at Swift UVOT position (Troja et al., 23946).

m ~ 17.5
RA, DEC = 14:08:15.72, +53:30:02.9
err = 1 arcsec

We obtain a following images with OT:

Tmid-T0  |          Site       |Filt.| Expt. | Limit | Comment
_________|_____________________|_____|_______|_______|________

      109 |        MASTER-Tunka |  P- |    10 | 16.82 |
      109 |        MASTER-Tunka |  P- |    80 | 18.47 |  Coadd
      109 |        MASTER-Tunka |  P| |    10 | 16.69 |
      109 |        MASTER-Tunka |  P| |    80 | 18.33 |  Coadd
      231 |        MASTER-Tunka |  P| |    30 | 17.60 |
      231 |        MASTER-Tunka |  P- |    30 | 17.74 |
      338 |        MASTER-Tunka |  P| |    40 | 17.70 |
      338 |        MASTER-Tunka |  P- |    40 | 17.87 |
      462 |         MASTER-Amur |  P/ |    60 | 13.12 |
      465 |        MASTER-Tunka |  P| |    60 | 18.12 |
      465 |        MASTER-Tunka |  P| |   250 | 19.14 |  Coadd
      465 |        MASTER-Tunka |  P- |    60 | 18.21 |
      465 |        MASTER-Tunka |  P- |   250 | 19.24 |  Coadd
      593 |         MASTER-Amur |  P/ |    60 | 12.20 |
      614 |        MASTER-Tunka |  P| |    80 | 18.50 |
      614 |        MASTER-Tunka |  P- |    80 | 18.43 |
      808 |        MASTER-Tunka |  P| |   110 | 18.65 |
      808 |        MASTER-Tunka |  P- |   110 | 18.65 |
     1032 |        MASTER-Tunka |  P| |   140 | 18.56 |
     1032 |        MASTER-Tunka |  P| |   490 | 19.35 |  Coadd
     1032 |        MASTER-Tunka |  P- |   140 | 18.55 |
     1032 |        MASTER-Tunka |  P- |   490 | 19.30 |  Coadd
     1305 |        MASTER-Tunka |  P| |   170 | 18.64 |
     1305 |        MASTER-Tunka |  P- |   170 | 18.63 |
     1622 |        MASTER-Tunka |  P| |   180 | 19.02 |
     1623 |        MASTER-Tunka |  P- |   180 | 18.89 |
     1949 |        MASTER-Tunka |  P| |   180 | 17.67 |
     1949 |        MASTER-Tunka |  P| |   540 | 19.26 |  Coadd
     1949 |        MASTER-Tunka |  P- |   180 | 17.63 |
     1949 |        MASTER-Tunka |  P- |   540 | 19.22 |  Coadd
     2284 |        MASTER-Tunka |  P| |   180 | 18.90 |
     2284 |        MASTER-Tunka |  P- |   180 | 18.98 |
     2616 |        MASTER-Tunka |  P| |   180 | 19.01 |
     2949 |        MASTER-Tunka |  P| |   180 | 19.10 |
     2949 |        MASTER-Tunka |  P| |   540 | 19.83 |  Coadd
     2949 |        MASTER-Tunka |  P- |   540 | 19.72 |  Coadd
     3959 |        MASTER-Tunka |  P- |   540 | 19.60 |  Coadd
     3959 |        MASTER-Tunka |  P| |   540 | 19.87 |  Coadd
     5650 |        MASTER-Tunka |  P| |   180 | 19.20 |
     5650 |        MASTER-Tunka |  P- |   180 | 18.89 |
     5979 |        MASTER-Tunka |  P- |   180 | 18.74 |
     5979 |        MASTER-Tunka |  P| |   180 | 19.02 |
     6312 |        MASTER-Tunka |  P| |   180 | 18.66 |
     6312 |        MASTER-Tunka |  P- |   180 | 18.79 |

The 5-sigma upper limit has been about 16.32mag The message may be cited.
====================================================================
The galactic latitude b = 60 deg., longitude l = 99 deg. The observations made on zenit distance = 48 deg.The moon (22 % bright part) is 14 deg. above the horizon. The distance between moon and object is 113 The sun altitude is -30.2 deg. The object can be observed till sunrise at 2019-03-12 23:26:58.
This message can be cited.

GCN Circular #23950
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1682 s of XRT Photon Counting mode data and 2 UVOT images for GRB 190311A, 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 = 212.06539, +53.50037 which is equivalent to:
```
RA (J2000): 14h 08m 15.69s
Dec (J2000): +53d 30' 01.3"
```
with an uncertainty of 1.8 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 #23951
S. Belkin (IKI), I. Reva (FAPHI), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), A. Kusakin (FAPHI), M. Krugov (FAPHI) report on behalf of IKI-GRB-FuN:
We observed the afterglow of GRB 190311A (Troja et al. GCN 23946) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Mar. 11 (UT) 15:54:08. Preliminary photometry of the afterglow detected previously (Troja et al. GCN 23946; Pozanenko et al. GCN 23947; Zhu et al. GCN 23948; Gorbovskoy et al. GCN 23949) is following.
```
Date       UT start t-T0    Filter  Exp. OT    Err.  UL
                     (mid, days)     (s)

2019-03-11 15:54:08 0.07228  R      3240 20.87 0.24  21.4
```
The photometry is based the stars used for calibration in GCN 23947.
GCN Circular #23952
A. Tohuvavohu (PSU), S. J. LaPorte (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 7.6 ks of XRT data for GRB 190311A (Troja et al. GCN Circ. 23946), from 86 s to 19.1 ks after the BAT trigger. The data comprise 80 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. 23950).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.27 (+0.38, -0.19), followed by a break at T+386 s to an alpha of 0.56 (+0.12, -0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.79 (+0.25, -0.24). The best-fitting absorption column is 2.1 (+1.2, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 1.2 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.04 (+0.19, -0.18) and a best-fitting absorption column of 3.8 (+0.9, -0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.8 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 1.2 x 10^20 cm^-2
Excess significance: 7.3 sigma
Photon index:	     2.04 (+0.19, -0.18)
```
If the light curve continues to decay with a power-law decay index of 0.56, the count rate at T+24 hours will be 0.022 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.2 x 10^-13 (1.3 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/00892607.
This circular is an official product of the Swift-XRT team.
GCN Circular #23953
P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team:
"At 14:23:37.601 UT on 11 March 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190311A (trigger 574007022 / 190311600), which was also detected by the Swift/BAT (Troja et al., GCN 23946). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 128 degrees.
The GBM light curve consists of a single peak with a duration (T90) of about 12.5 s (50-300 keV). The time-averaged spectrum from T0-4.1 s to T0+3.1 s is adequately fit by a simple power law function with index 1.86 +/- 0.08.
The event fluence (10-1000 keV) in this time interval is (1.40 +/- 0.18)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0-2.75 s in the 10-1000 keV band is 3.00 +/- 0.35 ph/s/cm^2.
A power law function with an exponential high-energy cutoff fits the spectrum equally well with Epeak= 89 +/- 34 keV and alpha = -1.51 +/- 0.25.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #23954
J. Mao, X.-L. Zhang, and J.-M. Bai (YNAO) report:
We observed the field of GRB 190311A (Troja et al. GCN Circ. 23946) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The observation began at UT 16:15:07, 11, March, 2019, about 2 hours after the trigger. We clearly detected the afterglow (Pozanenko et al. GCN Circ. 23947; Zhu et al. GCN Circ 23948; Belkin et al. GCN Circ. 23951) , and the preliminary magnitude is measured to be R~20.6.
GCN Circular #23958
E. Mazaeva (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We continue to observe optical afterglow of GRB 190311A (Troja et al. GCN 23946; Pozanenko et al. GCN 23947; Zhu et al. GCN 23948; Gorbovskoy et al. GCN 23949; Belkin et al. GCN 23951; Mao et al. GCN 23954) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Mar. 11 (UT) 15:11:33 (31 minutes after GRB trigger).
Light curve of the afterglow in R-filter (of the full set of the observations incl. reported earlier in GCNs 23947, 23951) can be found at: http://grb.rssi.ru/GRB190311A/GRB190311A_LC.png
Photometry is based on the SDSS-DR12 stars (Lupton transformations)
```
SDSS-DR12_id R
J140819.68 +532900.1 17.09
J140818.11 +532934.7 15.19
J140809.64 +533055.9 16.97
```
GCN Circular #23959
V. Peris (OAUV-Valencia) and A. Fernandez-Soto (IFCA-Santander) report:
We have observed the field of GRB190311A (Troja et al., GCN 23946) with the OAUV-0.5m telescope at the Observatorio de Aras de los Olmos (OAO) in Aras de los Olmos (Valencia, Spain). Observations began after local midnight on March 12 (UT 01:03, (t-t0) ~ 10.7 hours ~ 0.444 days).
We took 23 ten-minute exposures using a Johnson R filter, out of which 15 have been selected based on best quality. The afterglow reported in GCN23946 and confirmed by Pozanenko et al. (GCN 23947) is clearly detected in our combined image, with the following magnitude and timestamp:
```
UT(middle)    (t-t0)  Exposure    R    Error
----------   -------  --------  -----  -----
  03:41:46   0.4443d  15x10min  21.45   0.15
```
The image has been calibrated using 100 stars in the field, the APASS catalog (r and i mags) and the conversion equations in Lupton (2005) as given in the SDSS pages. The calibration zeropoint error is not significant in comparison with the flux uncertainty (Delta(ZP)~0.03).
Our results confirm the fading of the afterglow and extend the time baseline from previous observations. We cannot at the present stage measure the fading rate within our observations.
OAO is operated by the Observatori Astronomic de la Universitat de Valencia (OAUV).
GCN Circular #23961
J. R. Cummings (CPI), S. D. Barthelmy (GSFC), 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-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190311A (trigger #892607) (Troja et al., GCN Circ. 23946). The BAT ground-calculated position is RA, Dec = 212.067, 53.486 deg which is
```
  RA(J2000)  =  14h 08m 16.1s
  Dec(J2000) = +53d 29' 09.2"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 79%.
The mask-weighted light curve shows a single-pulse structure that starts at ~T-2 s, peaks at ~T+1 s, and ends at ~T+20 s. T90 (15-350 keV) is 17.0 +- 6.8 sec (estimated error including systematics).
The time-averaged spectrum from T-2.22 to T+20.78 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.80 +- 0.17. The fluence in the 15-150 keV band is 9.1 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.78 sec in the 15-150 keV band is 1.8 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/892607/BA/
GCN Circular #23962
J. Selsing (DAWN/NBI), Z.P. Zhu (NAOC), D. Xu (NAOC), D. Malesani� (DAWN/NBI, DARK/NBI), D. Nespral (IAC), D. Gandolfi (Univ. Turin), and� J. Telting (NOT), report on behalf of a larger collaboration:
We have observed the optical afterglow of GRB 190311A (Troja et al.,� GCN 23946; Goad et al., GCN 23950; Veres & Meegan, GCN 23953) with the� 2.5-m Nordic Optical Telescope (NOT). We have obtained an r+z imaging� sequence using the ALFOSC instrument, with 4x300 and 5x300 s exposure in� the r and z band, respectively. Imaging observations began 9.4 hr after� the BAT trigger.
In the images we clearly detect the optical counterpart of GRB 190311A,� as previously reported (Zhu et al., GCN 23948; Pozanenko et al., GCN� 23947; Gorbovskoy et al., GCN 23949; Belkin et al., GCN 23951; Mao et� al., GCN 23954; Peris & Fernandez-Soto, GCN 23959).
We calibrate the photometric zeropoints against the Pan-STARRS catalog and derive the following magnitudes for the optical counterpart:
```
r = 21.88 +- 0.03 AB mag
z = 21.26 +- 0.04 AB mag
```
The source is centred at the position:
```
RA (J2000.0) = 14:08:15.726
DEC (J2000.0) = +53:30:02.74
```
with the astrometric solution calibrated against the 2MASS catalog.
GCN Circular #23963
M. Blazek, L. Izzo. D. A. Kann (all HETH/IAA-CSIC), A. de Ugarte-Postigo (HETH/IAA-CSIC, DARK/NBI) and C. C. Thoene (HETH/IAA-CSIC) report:
We observed the Swift GRB 190311A (Troja et al, GCN 23946) with the 2-m Liverpool Telescope located in La Palma, Spain. The observation started at 02:19:56 UT on March 12, 2019 (t-t0 = 11.94 hours). We obtained 5x60 seconds exposures each in g', r', and i'. We clearly detected the optical afterglow inside the Swift-XRT error circle given of Goad et al. (GCN 23950). We measure the following magnitudes
```
g' = 22.18 +- 0.24 mag,
r' = 21.70 +- 0.13 mag,
i' = 21.54 +- 0.18 mag.
```
Magnitudes were derived against 9 nearby stars from the SDSS catalogue and are in the AB system.
GCN Circular #23964
E. Mazaeva (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We continue observations the afterglow of GRB 190311A�(Troja et al. GCN 23946) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Mar. 12 (UT) 16:23:42. Preliminary photometry of the afterglow detected previously (Troja et al. GCN 23946; Pozanenko et al. GCN 23947; Zhu et al. GCN 23948; Gorbovskoy et al. GCN 23949; Belkin et al. GCN 23951; Mao et al. GCN 23954; Mazaeva et al. GCN 23958; Selsing et al. GCN 23962; Blazek et al. GCN 23963) is following.
```
Date������ UT start t-T0��� Filter� Exp. OT��� Err.� UL
�������������������� (mid, days)���� (s)
```
2019-03-12 16:23:42 1.11471� R� 5400 22.16 0.09� 23.5
The photometry is based on several nearby SDSS-DR12 stars used in GCN 23958.
GCN Circular #23965
M. H. Siegel (PSU) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190311A 88 s after the BAT trigger (Troja et al., GCN Circ. 23946). A source consistent with the XRT position (Goad et al., GCN Circ. 23950) is detected in the initial UVOT exposures. This source is consistent with the initial transient reported by UVOT, Mondy (Pozanenko et al., GCN Circ. 23947), Next (Zhu et al., GCN Circ. 23948), MASTER (Gorbovskoy, GCN Circ. 23949), TSHAO (Belkin et al., 23951), GMG (Mao et al., GCN Circ. 23954) and OAO (Peris et al., GCN Circ. 23959). The source faded below detection by the second orbit.
The preliminary UVOT position is:
```
    RA  (J2000) =  14:08:15.71 = 212.06546 (deg.)
    Dec (J2000) = +53:30:02.9  =  53.50080 (deg.)
```
with an estimated uncertainty of 0.49 arc sec. (radius, 90% confidence).
Preliminary detections 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               88          238          147         19.59 +/- 0.10
white             5678         7314          393            >21.42
white            51260        58205         2454            >22.45
u                  301          550          246         19.85 +/- 0.20
u                 6704        18770         1081            >21.08
b                 6910        19082          493            >20.89
v                 6089        12525         1164            >20.42
uvw1              6500        28478         1676            >20.98
uvm2              6294        23285         1557            >20.87
uvw2              5884         7521          393            >20.16
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #23966
M. Blazek, D. A. Kann, L. Izzo, C. C. Thoene (all HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), and A. Sota (IAA-CSIC) report:
We observed the Swift GRB 190311A (Troja et al, GCN 23946) with the 1.5-m telescope of the Sierra Nevada Observatory (OSN), Spain. The observation started at 22:54:30 on March 11, 2019 (t-t0 = 8.5158 hours). We obtained 9x360 seconds exposures each in V, Rc and Ic band. We clearly detect the optical afterglow inside the Swift-XRT error circle given by Goad et al. (GCN 23950). We measure the following AB magnitudes:
```
V  = 21.94 +- 0.17 mag     (23:31:10 - 1:54:18 UT)
Rc = 21.7  +- 0.09 mag     (23:12:50 - 1:35:58 UT)
Ic = 21.27 +- 0.15 mag     (22:54:30 - 1:16:14 UT)
```
Magnitudes were derived against 11 nearby stars from the SDSS catalogue, using the transformation equations of Lupton (2005), and transformed back into AB mags.
GCN Circular #23968
K. Iida, R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita, K. Shiraishi, M. Oeda, M. Niwano, R. Adachi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration
We searched for the optical counterpart of GRB 190311A (Troja et al., GCN Circular #23946) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 14:24:43.64 UT which corresponds to 70 sec after the trigger. We detected the point source at the position consistent with the afterglow detected previously (Troja et al. GCN #23946; Pozanenko et al. GCN #23947; Zhu et al. GCN #23948; Gorbovskoy et al. GCN #23949, Belkin et al. GCN #23951). The measured magnitudes are listed as follows.
```
T0+[sec]    MID-UT      T-EXP[sec]        g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~70      14:24:46.22          540              18.9+/-0.2
18.6+/-0.2     18.2+/-0.2
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration. The magnitudes are expressed in the Vega system.

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Jochen Greiner, last update: 15-Mar-2019 [Disclaimer]