Gamma-ray Burst 200819A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:44:59 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     992099,   Seg_Num: 0
GRB_RA:           21.428d {+01h 25m 43s} (J2000),
                  21.776d {+01h 27m 06s} (current),
                  20.592d {+01h 22m 22s} (1950)
GRB_DEC:         +63.048d {+63d 02' 52"} (J2000),
                 +63.155d {+63d 09' 17"} (current),
                 +62.788d {+62d 47' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6478 [cnts]    Image_Peak=250 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       63977 [cnts]
BKG_TIME:        56598.51 SOD {15:43:18.51} UT
BKG_DUR:         24 [sec]
GRB_DATE:        19080 TJD;   232 DOY;   20/08/19
GRB_TIME:        56632.88 SOD {15:43:52.88} UT
GRB_PHI:         -167.72 [deg]
GRB_THETA:        22.30 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.09 [sigma]
IMAGE_SIGNIF:    7.88 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +1  +8  +0 
SUN_POSTN:       149.32d {+09h 57m 17s}  +12.47d {+12d 28' 16"}
SUN_DIST:         94.36 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.04d {+10h 32m 10s}  +14.17d {+14d 10' 18"}
MOON_DIST:        95.62 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       50.21, 48.76 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 175.88,19.76 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 19 Aug 20 15:45:26 UT 
NOTICE_TYPE:     Swift-XRT Nack-Position 
TRIGGER_NUM:     992099,   Seg_Num: 0 
POINT_RA:         21.422d {+01h 25m 41s} (J2000) 
POINT_DEC:       +63.040d {+63d 02' 24"} (J2000) 
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19 
IMG_START_TIME:  56717.42 SOD {15:45:17.42} UT,   84.5 [sec] since BAT Trigger Time 
COUNTS:          7    Min_needed= 20 
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec] 
PH2_ITER:        1    Max_iter_allowed= 4 
ERROR_CODE:      1 
COMMENTS:        SWIFT-XRT Nack Position.   
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:47:34 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     992099,   Seg_Num: 0
GRB_RA:           21.428d {+01h 25m 43s} (J2000),
                  21.776d {+01h 27m 06s} (current),
                  20.592d {+01h 22m 22s} (1950)
GRB_DEC:         +63.048d {+63d 02' 52"} (J2000),
                 +63.155d {+63d 09' 17"} (current),
                 +62.788d {+62d 47' 17"} (1950)
GRB_DATE:        19080 TJD;   232 DOY;   20/08/19
GRB_TIME:        56632.88 SOD {15:43:52.88} UT
TRIGGER_INDEX:   262
GRB_PHI:         -167.72 [deg]
GRB_THETA:        22.30 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.09 [sigma]
IMAGE_SIGNIF:    7.88 [sigma]
LC_URL:          sw00992099000msb.lc
SUN_POSTN:       149.32d {+09h 57m 18s}  +12.47d {+12d 28' 14"}
SUN_DIST:         94.36 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.07d {+10h 32m 16s}  +14.16d {+14d 09' 46"}
MOON_DIST:        95.64 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       50.21, 48.76 [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 = 175.88,19.76 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:49:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.423d {+01h 25m 41s} (J2000)
POINT_DEC:       +63.040d {+63d 02' 24"} (J2000)
POINT_ROLL:      50.587d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56721.33 SOD {15:45:21.33} UT,   88.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.098
N_STARS:         133
X_OFFSET:        501 [pixels]
Y_OFFSET:        485 [pixels]
X_MAX:           1460 [pixels]
Y_MAX:           1444 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00992099000msufc0088.fits
SUN_POSTN:       149.33d {+09h 57m 18s}  +12.47d {+12d 28' 13"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.08d {+10h 32m 20s}  +14.16d {+14d 09' 25"}
MOON_DIST:        95.65 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.20, 48.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:49:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.423d {+01h 25m 41s} (J2000)
POINT_DEC:       +63.040d {+63d 02' 24"} (J2000)
POINT_ROLL:      50.587d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56721.33 SOD {15:45:21.33} UT,   88.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.098
N_STARS:         133
X_OFFSET:        501 [pixels]
Y_OFFSET:        485 [pixels]
X_MAX:           1460 [pixels]
Y_MAX:           1444 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00992099000msufc0088.fits
SUN_POSTN:       149.33d {+09h 57m 18s}  +12.47d {+12d 28' 13"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.08d {+10h 32m 20s}  +14.16d {+14d 09' 22"}
MOON_DIST:        95.65 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.20, 48.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:49:21 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     992099,   Seg_Num: 0
GRB_RA:           21.4237d {+01h 25m 41.68s} (J2000),
                  21.7715d {+01h 27m 05.15s} (current),
                  20.5879d {+01h 22m 21.10s} (1950)
GRB_DEC:         +63.0607d {+63d 03' 38.5"} (J2000),
                 +63.1675d {+63d 10' 03.0"} (current),
                 +62.8008d {+62d 48' 02.8"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56726.00 SOD {15:45:26.00} UT,   93.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       149.33d {+09h 57m 18s}  +12.47d {+12d 28' 13"}
SUN_DIST:         94.36 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.08d {+10h 32m 20s}  +14.16d {+14d 09' 24"}
MOON_DIST:        95.64 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.45 [deg] galactic lon,lat of the burst
ECL_COORDS:       50.21, 48.77 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:50:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.423d {+01h 25m 41s} (J2000)
POINT_DEC:       +63.040d {+63d 02' 24"} (J2000)
ROLL:            50.587d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56721.33 SOD {15:45:21.33} UT,   88.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     619544746
X_OFFSET:        820 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       980
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00992099000msuni0114.fits
SUN_POSTN:       149.33d {+09h 57m 18s}  +12.47d {+12d 28' 12"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.10d {+10h 32m 23s}  +14.15d {+14d 09' 07"}
MOON_DIST:        95.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.20, 48.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:50:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.423d {+01h 25m 41s} (J2000)
POINT_DEC:       +63.040d {+63d 02' 24"} (J2000)
ROLL:            50.587d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56721.33 SOD {15:45:21.33} UT,   88.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     619544746
X_OFFSET:        820 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       980
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00992099000msuni0114.fits
SUN_POSTN:       149.33d {+09h 57m 18s}  +12.47d {+12d 28' 12"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.10d {+10h 32m 23s}  +14.15d {+14d 09' 06"}
MOON_DIST:        95.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.20, 48.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:57:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.424d {+01h 25m 42s} (J2000)
POINT_DEC:       +63.038d {+63d 02' 16"} (J2000)
POINT_ROLL:      50.588d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56933.35 SOD {15:48:53.35} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.328
N_STARS:         96
X_OFFSET:        261 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1700 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00992099000msufc0300.fits
SUN_POSTN:       149.33d {+09h 57m 19s}  +12.47d {+12d 28' 06"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.16d {+10h 32m 39s}  +14.13d {+14d 07' 46"}
MOON_DIST:        95.70 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.19, 48.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:57:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.424d {+01h 25m 42s} (J2000)
POINT_DEC:       +63.038d {+63d 02' 16"} (J2000)
POINT_ROLL:      50.588d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56933.35 SOD {15:48:53.35} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.328
N_STARS:         96
X_OFFSET:        261 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1700 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00992099000msufc0300.fits
SUN_POSTN:       149.33d {+09h 57m 19s}  +12.47d {+12d 28' 06"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.16d {+10h 32m 39s}  +14.13d {+14d 07' 42"}
MOON_DIST:        95.71 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.19, 48.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:58:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.424d {+01h 25m 42s} (J2000)
POINT_DEC:       +63.038d {+63d 02' 16"} (J2000)
ROLL:            50.588d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56933.35 SOD {15:48:53.35} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     619544958
X_OFFSET:        820 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       980
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00992099000msuni0326.fits
SUN_POSTN:       149.33d {+09h 57m 20s}  +12.47d {+12d 28' 05"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.18d {+10h 32m 42s}  +14.12d {+14d 07' 28"}
MOON_DIST:        95.71 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.19, 48.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:57:46 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     992099,   Seg_Num: 0
GRB_RA:           21.4239d {+01h 25m 41.73s} (J2000),
                  21.7717d {+01h 27m 05.19s} (current),
                  20.5881d {+01h 22m 21.14s} (1950)
GRB_DEC:         +63.0613d {+63d 03' 40.6"} (J2000),
                 +63.1681d {+63d 10' 05.1"} (current),
                 +62.8014d {+62d 48' 05.0"} (1950)
GRB_ERROR:       2.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56726.00 SOD {15:45:26.00} UT,   93.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       149.33d {+09h 57m 19s}  +12.47d {+12d 28' 06"}
SUN_DIST:         94.36 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.17d {+10h 32m 40s}  +14.13d {+14d 07' 40"}
MOON_DIST:        95.69 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.45 [deg] galactic lon,lat of the burst
ECL_COORDS:       50.21, 48.77 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 20 15:58:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     992099,   Seg_Num: 0
POINT_RA:         21.424d {+01h 25m 42s} (J2000)
POINT_DEC:       +63.038d {+63d 02' 16"} (J2000)
ROLL:            50.588d
IMG_START_DATE:  19080 TJD;   232 DOY;   20/08/19
IMG_START_TIME:  56933.35 SOD {15:48:53.35} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     619544958
X_OFFSET:        820 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       980
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00992099000msuni0326.fits
SUN_POSTN:       149.33d {+09h 57m 20s}  +12.47d {+12d 28' 05"}
SUN_DIST:         94.37 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      158.18d {+10h 32m 42s}  +14.12d {+14d 07' 26"}
MOON_DIST:        95.71 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      126.80,  0.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       50.19, 48.75 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #28263
S. Dichiara (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), P. A. Evans (U Leicester), C. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 15:43:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200819A (trigger=992099). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 21.428, +63.048 which is
```
   RA(J2000) = 01h 25m 43s
   Dec(J2000) = +63d 02' 52"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 10 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 15:45:17.4 UT, 84.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 21.4240, 63.0614 which is equivalent to:
```
   RA(J2000)  = 01h 25m 41.76s
   Dec(J2000) = +63d 03' 40.9"
```
with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 48 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 9.84 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 88 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain, extinction expected.
We note that this source is near the Galactic plane (lat=0.45, lon=126.8 degrees) which raises the possibility that this is a new Galactic transient. The source is somewhat soft (visible above 50 keV but not above 100 keV). The lightcurve is consistent with either a GRB or a Galactic transient. The complete dataset from this event and further observations of the source will determine the nature of this source. If it is a Galactic transient we would name it Swift J0125.7+6303 .
Burst Advocate for this burst is S. Dichiara (dichiara AT umd.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #28264
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 200819A ( S. Dichiara et al., GCN 28263) errorbox 80 sec after notice time and 149 sec after trigger time at 2020-08-19 15:46:22 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 39 deg. The sun altitude is -23.8 deg.
The galactic latitude b = 1 deg., longitude l = 127 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1422693
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     165 |        MASTER-Tunka |  P| |    30 | 16.3 |        
     465 |        MASTER-Tunka |  P| |   630 | 17.7 |  Coadd 
     219 |        MASTER-Tunka |  P| |    40 | 16.5 |        
     284 |        MASTER-Tunka |  P| |    50 | 16.7 |        
     358 |        MASTER-Tunka |  P| |    60 | 16.9 |        
     448 |        MASTER-Tunka |  P| |    80 | 17.0 |        
     557 |        MASTER-Tunka |  P| |   100 | 16.8 |        
     687 |        MASTER-Tunka |  P| |   120 | 16.6 |        
     841 |        MASTER-Tunka |  P| |   150 | 16.1 |        
    1026 |        MASTER-Tunka |  P| |   180 | 16.1 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #28265
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 493 s of XRT Photon Counting mode data and 1 UVOT images for GRB 200819A, 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 = 21.42421, +63.06092 which is equivalent to:
```
RA (J2000): 01h 25m 41.81s
Dec (J2000): +63d 03' 39.3"
```
with an uncertainty of 2.2 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 #28266
S. Belkin (IKI), A. Kusakin (FAPHI), A. Novichonok (KIAM), A. Pozanenko (IKI), I. Reva (FAPHI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 200819A (Dichiara et al., GCN 28263) with Zeiss-1000 telescope of Tien Shan Astronomical observatory starting on August 19 (UT) 18:03:47 and with RC-36 of Kitab observatory on (UT) 16:30:50. We do not detect any optical object within enhanced XRT position (Evans et al., GCN 28265). Preliminary photometry of the field is following.
```
Date        UT start t-T0     Filter Exp.    OT   Err.   UL  Telesope
                      (mid, days)     (s)

2020-08-19  16:30:50 0.05345   CR     3600  n/d  n/d    20.0 RC-36
2020-08-19  18:03:47 0.10289   R      990   n/d  n/d    21.2 Zeiss-1000
```
The photometry is based on nearby USNO-B1.0 stars.
Ref.stars
```
USNO-B1.0_id R2
1530-0056474 15.45
1530-0056771 15.06
```
GCN Circular #28267
Martin Jelinek, Jan Strobl and Ludek Rezba (ASU CAS Ondrejov, CZ), report:
We observed the location of the GRB 200819A / Swift J0125.7+6303 (Dichiara et al, GCNC 28263), with the photometric camera of the 2m Perek telescope of Ondrejov observatory in the Czech Republic.
The observations consisted of 20 x 120s dithered SDSS-z' exposures, starting at 20:30:19 UT, with observation mean time 5.08h after the initial trigger. There is no source detected within the XRT errorbox (Evans et al, GCN28265), we estimate the magnitude limit of our combined image as z'>22.0
GCN Circular #28269
K. L. Murata, R. Hosokawa, R. Adachi, M. Niwano, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (Tokyo Tech), Takashi Horiuchi, Hidekazu Hanayama (NAOJ) report on behalf of the MITSuME collaboration:
We observed the field of GRB 200819A (Dichiara et al., GCN 28263; Evans et al., GCN 28265) with the optical three color (g’, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation with a series of 60 sec exposures started on 2020-08−19 15:45:44 UT. Some images were heavily affected by bad weather conditions. We stacked the images with good weather conditions. We did not find any new point sources within the enhanced Swift/XRT error circle (Evans et al., GCN 28265) of the stacked images. We obtained the 5-sigma limits as follows.
```
T0+[sec] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
~290 2020-08-19T17:36:48 5640 g’>18.4, Rc>19.0, Ic>19.3
------------------------------------------------------------------------------------------------
T0+: Elapsed time after the burst
T-EXP: Total Exposure time
```
We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., submitted; https://github.com/MNiwano/Eclaire)
GCN Circular #28271
Takashi Horiuchi, Hidekazu Hanayama (NAOJ), Katsuhiro L. Murata, Yoichi Yatsu, Nobuyuki Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 200819A (Dichiara et al., GCN 28263; Evans et al., GCN 28265) with the optical three color (g', Rc, and Ic) CCD cameras attached to the 105 cm Murikabushi telescope of Ishigakijima Astronomical Observatory, Okinawa, Japan.
The observation with a series of 60 sec exposures started on 2020-08−19 16:35:33 UT. Throughout, the images were terribly extended by the altitude oscillation of the Murikabushi Telescope. We stacked the 79 images and did not find any new point sources other than the USNO-B1.0 sources from the stacked images. We obtained the SN = 10 limits as follows.
```
T0+[min] MID-UT T-EXP[sec] SN=10 limits
------------------------------------------------------------------------------------------------
52 2020-08-19T17:21:38 960 g'>18.7, Rc>19.0, Ic>17.8
------------------------------------------------------------------------------------------------
```
GCN Circular #28272
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB) and S. Dichiara report on behalf of the Swift-XRT team:
We have analysed 7.3 ks of XRT data for GRB 200819A (Dichiara et al. GCN Circ. 28263), from 94 s to 40.7 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 28265).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.83 (+/-0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.6 (+/-0.5). The best-fitting absorption column is 2.2 (+1.1, -0.9) x 10^22 cm^-2, in excess of the Galactic value of 9.8 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 7.6 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+1.1, -0.9) x 10^22 cm^-2
Galactic foreground: 9.8 x 10^21 cm^-2
Excess significance: 2.3 sigma
Photon index:	     1.6 (+/-0.5)
```
If the light curve continues to decay with a power-law decay index of 0.83, the count rate at T+24 hours will be 2.3 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.9 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/00992099.
This circular is an official product of the Swift-XRT team.
GCN Circular #28273
Anirban Dutta(IIA, Bengaluru), Brajesh Kumar(ARIES, Nainital), Avinash Singh, G. C. Anupama, D. K. Sahu and Pramod Kumar (IIA, Bengaluru)
We observed the field of GRB 200819A (Dichiara et al., GCN #28263; Evans et al., GCN #28265) with the Himalaya Faint Object Spectrograph and Camera (HFOSC) mounted on the 2-m Himalayan Chandra Telescope (IAO, Hanle, India). Multiple frames (each 300 sec) of the GRB field in Bessell R and I bands were obtained with an average airmass of 1.3 and a seeing of 2''. Preliminary PSF photometry on the stacked images was performed and calibrated against USNO-B1 catalogue. We do not detect any OT within the enhanced XRT position (Belkin et al., GCN #28266; Jelinek et al., GCN #28267).
The estimated limiting magnitude is as under -
```
 Date          |    UT (mean)     | Filter |  Exp time x no. of frames |  Upper limit (mag)
 2020-08-19        19:16:23          R                300 sec x 4                  21.5
 2020-08-19        19:32:37          I                300 sec X 4                  20.3 
```
We thank the staff at IAO and CREST for helping with the observations.
GCN Circular #28276
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Dichiara (NASA/GSFC/UMCP), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), 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 200819A (trigger #992099) (Dichiara et al., GCN Circ. 28263). The BAT ground-calculated position is RA, Dec = 21.527, 63.061 deg which is
```
   RA(J2000)  =  01h 26m 06.4s
   Dec(J2000) = +63d 03' 39.3"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a double-peaked structure that starts at ~T0 and ends at ~T+7 s, followed by some tail emission that lasts until ~T+27 s. T90 (15-350 keV) is 23.62 +- 6.74 sec (estimated error including systematics).
The time-averaged spectrum from T-0.72 to T+27.12 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.08 +- 0.31. The fluence in the 15-150 keV band is 3.2 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.31 sec in the 15-150 keV band is 0.6 +- 0.1 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/992099/BA/
GCN Circular #28281
M. H. Siegel (PSU) and S. Dichiara (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200819A 89 s after the BAT trigger (Dichiara et al., GCN Circ. 28263). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 28265) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            89          239          147         >20.4
u_FC               301          551          246         >19.0
white               89          601          167         >20.3
b                  557          577           19         >17.7
u                  301          551          246         >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.59 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 21-Aug-2020 [Disclaimer]