Gamma-ray Burst 200806A

(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:     Thu 06 Aug 20 15:29:08 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     987016,   Seg_Num: 0
GRB_RA:           52.905d {+03h 31m 37s} (J2000),
                  53.238d {+03h 32m 57s} (current),
                  52.098d {+03h 28m 24s} (1950)
GRB_DEC:         +37.082d {+37d 04' 55"} (J2000),
                 +37.151d {+37d 09' 03"} (current),
                 +36.912d {+36d 54' 45"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2665 [cnts]    Image_Peak=195 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   124     E_range: 25-100 keV
BKG_INTEN:       25600 [cnts]
BKG_TIME:        55718.58 SOD {15:28:38.58} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19067 TJD;   219 DOY;   20/08/06
GRB_TIME:        55729.91 SOD {15:28:49.91} UT
GRB_PHI:         -24.74 [deg]
GRB_THETA:        38.50 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.57 [sigma]
IMAGE_SIGNIF:    11.05 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +1  +0  +0 -24  +0 
SUN_POSTN:       137.09d {+09h 08m 21s}  +16.44d {+16d 26' 40"}
SUN_DIST:         75.35 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      351.96d {+23h 27m 51s}   -8.97d {-08d 57' 59"}
MOON_DIST:        73.49 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       59.71, 17.46 [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 = 252.35,15.31 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:30:44 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     987016,   Seg_Num: 0
GRB_RA:           52.9298d {+03h 31m 43.1s} (J2000),
                  53.2631d {+03h 33m 03.1s} (current),
                  52.1228d {+03h 28m 29.4s} (1950)
GRB_DEC:         +37.0799d {+37d 04' 47.6"} (J2000),
                 +37.1488d {+37d 08' 55.5"} (current),
                 +36.9105d {+36d 54' 37.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55807.64 SOD {15:30:07.64} UT,   77.7 [sec] since BAT Trigger Time
CENTROID_X:      272.64,  raw= 273  [pixels]
CENTROID_Y:      304.83,  raw= 305  [pixels]
ROLL:            80.07 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   15.87
GRB_POS_XRT_Z:   -81.93
IMAGE_URL:       sw00987016000msxps_rw.img
SUN_POSTN:       137.09d {+09h 08m 21s}  +16.44d {+16d 26' 38"}
SUN_DIST:         75.34 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      351.97d {+23h 27m 54s}   -8.96d {-08d 57' 40"}
MOON_DIST:        73.49 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.15,-15.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       59.73, 17.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:30:47 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     987016,   Seg_Num: 0
GRB_RA:           52.9298d {+03h 31m 43.1s} (J2000),
                  53.2631d {+03h 33m 03.1s} (current),
                  52.1228d {+03h 28m 29.4s} (1950)
GRB_DEC:         +37.0799d {+37d 04' 47.6"} (J2000),
                 +37.1488d {+37d 08' 55.5"} (current),
                 +36.9105d {+36d 54' 37.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55807.64 SOD {15:30:07.64} UT,   77.7 [sec] since BAT Trigger Time
CENTROID_X:      272.64,  raw= 273  [pixels]
CENTROID_Y:      304.83,  raw= 305  [pixels]
ROLL:            80.07 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   15.87
GRB_POS_XRT_Z:   -81.93
IMAGE_URL:       sw00987016000msxps_rw.img
SUN_POSTN:       137.09d {+09h 08m 21s}  +16.44d {+16d 26' 38"}
SUN_DIST:         75.34 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      351.97d {+23h 27m 54s}   -8.96d {-08d 57' 40"}
MOON_DIST:        73.49 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.15,-15.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       59.73, 17.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:30:34 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     987016,   Seg_Num: 0
GRB_RA:           52.9298d {+03h 31m 43.15s} (J2000),
                  53.2631d {+03h 33m 03.14s} (current),
                  52.1228d {+03h 28m 29.47s} (1950)
GRB_DEC:         +37.0799d {+37d 04' 47.6"} (J2000),
                 +37.1488d {+37d 08' 55.5"} (current),
                 +36.9105d {+36d 54' 37.8"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.59e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.05 [sigma]
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55807.64 SOD {15:30:07.64} UT,   77.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.18 261.45 243.46
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       137.09d {+09h 08m 21s}  +16.44d {+16d 26' 39"}
SUN_DIST:         75.34 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      351.97d {+23h 27m 53s}   -8.96d {-08d 57' 42"}
MOON_DIST:        73.49 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.15,-15.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       59.73, 17.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.18 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:34:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve 
TRIGGER_NUM:     14532607,   Seg_Num: 0   
GRB_RA:           52.905d {+03h 31m 37s} (J2000),
                  53.238d {+03h 32m 57s} (current),
                  52.098d {+03h 28m 24s} (1950)
GRB_DEC:         +37.082d {+37d 04' 55"} (J2000),
                 +37.151d {+37d 09' 03"} (current),
                 +36.912d {+36d 54' 45"} (1950)
GRB_DATE:        19067 TJD;   219 DOY;   20/08/06
GRB_TIME:        55729.91 SOD {15:28:49.91} UT
TRIGGER_INDEX:   124
GRB_PHI:         -24.74 [deg]
GRB_THETA:        38.50 [deg]
DELTA_TIME:      1480.00 [sec]
TRIGGER_DUR:     0.512 [sec]
SOLN_STATUS:     0x3
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00987016000msb.lc
SUN_POSTN:       137.09d {+09h 08m 22s}  +16.44d {+16d 26' 36"}
SUN_DIST:         75.36 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.00d {+23h 28m 00s}   -8.95d {-08d 57' 00"}
MOON_DIST:        73.45 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       59.71, 17.46 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.
COMMENTS:         
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!
COMMENTS:        
COMMENTS:        This does not match any source in the ground catalog.
COMMENTS:        This is a GRB.
COMMENTS:        This trigger occurred at longitude,latitude = 252.35,15.31 [deg].
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:44:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.903d {+03h 31m 37s} (J2000)
POINT_DEC:       +37.071d {+37d 04' 15"} (J2000)
POINT_ROLL:      80.071d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55816.15 SOD {15:30:16.15} UT,   86.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.993
N_STARS:         77
X_OFFSET:        480 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00987016000msufc0086.fits
SUN_POSTN:       137.10d {+09h 08m 24s}  +16.44d {+16d 26' 29"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.09d {+23h 28m 21s}   -8.92d {-08d 54' 54"}
MOON_DIST:        73.36 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.14,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 29 May 20 01:07:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     974942,   Seg_Num: 0
POINT_RA:        238.839d {+15h 55m 21s} (J2000)
POINT_DEC:       -11.062d {-11d 03' 43"} (J2000)
ROLL:            326.309d
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29
IMG_START_TIME:  3611.94 SOD {01:00:11.94} UT,   216.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     612406836
X_OFFSET:        886 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1046
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00974942000msuni0242.fits
SUN_POSTN:        66.39d {+04h 25m 33s}  +21.66d {+21d 39' 44"}
SUN_DIST:        167.37 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.77d {+09h 51m 04s}  +17.64d {+17d 38' 39"}
MOON_DIST:        94.62 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.61, 31.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.05,  9.09 [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:     Thu 06 Aug 20 15:46:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.903d {+03h 31m 37s} (J2000)
POINT_DEC:       +37.071d {+37d 04' 15"} (J2000)
ROLL:            80.071d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55816.15 SOD {15:30:16.15} UT,   86.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     618420641
X_OFFSET:        939 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1099
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00987016000msuni0112.fits
SUN_POSTN:       137.10d {+09h 08m 24s}  +16.44d {+16d 26' 27"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.10d {+23h 28m 24s}   -8.91d {-08d 54' 32"}
MOON_DIST:        73.34 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.14,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.45 [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:     Thu 06 Aug 20 15:46:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.903d {+03h 31m 37s} (J2000)
POINT_DEC:       +37.071d {+37d 04' 15"} (J2000)
ROLL:            80.071d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  55816.15 SOD {15:30:16.15} UT,   86.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     618420641
X_OFFSET:        939 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1099
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00987016000msuni0112.fits
SUN_POSTN:       137.10d {+09h 08m 24s}  +16.44d {+16d 26' 27"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.10d {+23h 28m 24s}   -8.91d {-08d 54' 31"}
MOON_DIST:        73.34 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.14,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.45 [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:     Thu 06 Aug 20 15:51:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
POINT_ROLL:      80.070d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56029.46 SOD {15:33:49.46} UT,   299.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.849
N_STARS:         37
X_OFFSET:        619 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1578 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00987016000msufc0299.fits
SUN_POSTN:       137.10d {+09h 08m 25s}  +16.44d {+16d 26' 24"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.13d {+23h 28m 32s}   -8.90d {-08d 53' 42"}
MOON_DIST:        73.31 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:51:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
POINT_ROLL:      80.070d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56029.46 SOD {15:33:49.46} UT,   299.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.849
N_STARS:         37
X_OFFSET:        619 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1578 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00987016000msufc0299.fits
SUN_POSTN:       137.10d {+09h 08m 25s}  +16.44d {+16d 26' 24"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.14d {+23h 28m 33s}   -8.89d {-08d 53' 40"}
MOON_DIST:        73.31 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [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:     Tue 24 Mar 20 16:58:44 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
ROLL:            52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60807.91 SOD {16:53:27.91} UT,   860.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     606761632
X_OFFSET:        559 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0884.fits
SUN_POSTN:         4.15d {+00h 16m 35s}   +1.79d {+01d 47' 42"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.15d {+00h 36m 36s}   -1.44d {-01d 26' 09"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [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:     Thu 06 Aug 20 15:53:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            37.074d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56749.86 SOD {15:45:49.86} UT,   1019.9 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1280 [pixels]
WIDTH:           800 [pixels]
HEIGHT:          1821 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00987016000msuni0325.fits
SUN_POSTN:       137.10d {+09h 08m 25s}  +16.44d {+16d 26' 22"}
SUN_DIST:        134.35 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      352.16d {+23h 28m 37s}   -8.89d {-08d 53' 10"}
MOON_DIST:        12.09 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:54:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
POINT_ROLL:      80.069d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56605.99 SOD {15:43:25.99} UT,   876.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.502
N_STARS:         171
X_OFFSET:        379 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1818 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00987016000msufc0876.fits
SUN_POSTN:       137.11d {+09h 08m 25s}  +16.44d {+16d 26' 22"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.16d {+23h 28m 39s}   -8.88d {-08d 52' 59"}
MOON_DIST:        73.28 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 15:55:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
POINT_ROLL:      80.069d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56605.99 SOD {15:43:25.99} UT,   876.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.502
N_STARS:         171
X_OFFSET:        379 [pixels]
Y_OFFSET:        219 [pixels]
X_MAX:           1818 [pixels]
Y_MAX:           1658 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00987016000msufc0876.fits
SUN_POSTN:       137.11d {+09h 08m 25s}  +16.44d {+16d 26' 22"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.17d {+23h 28m 40s}   -8.88d {-08d 52' 56"}
MOON_DIST:        73.28 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [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:     Thu 06 Aug 20 15:55:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     987016,   Seg_Num: 0
POINT_RA:         52.901d {+03h 31m 36s} (J2000)
POINT_DEC:       +37.074d {+37d 04' 26"} (J2000)
ROLL:            80.069d
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56605.99 SOD {15:43:25.99} UT,   876.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     618421431
X_OFFSET:        938 [pixels]
Y_OFFSET:        778 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1098
Y_GRB_POS:       938
BINNING_INDEX:   1
IM_URL:          sw00987016000msuni0902.fits
SUN_POSTN:       137.11d {+09h 08m 25s}  +16.44d {+16d 26' 21"}
SUN_DIST:         75.37 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.17d {+23h 28m 41s}   -8.88d {-08d 52' 48"}
MOON_DIST:        73.27 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.13,-15.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       59.70, 17.46 [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:     Tue 24 Mar 20 16:58:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
ROLL:            52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60807.91 SOD {16:53:27.91} UT,   860.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     606761632
X_OFFSET:        559 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0884.fits
SUN_POSTN:         4.15d {+00h 16m 35s}   +1.79d {+01d 47' 42"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.15d {+00h 36m 37s}   -1.44d {-01d 26' 06"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [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 #28211
E. Ambrosi (INAF-IASFPA), D. N. Burrows (PSU), V. D'Elia (SSDC), J.D. Gropp (PSU), H. A. Krimm (NSF), 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 15:28:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200806A (trigger=987016). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 52.905, +37.082 which is
```
   RA(J2000) = 03h 31m 37s
   Dec(J2000) = +37d 04' 55"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a pulse that starts at ~T0 and lasts beyond the currently available data, which ends at ~T+8 s. The peak count rate was ~4800 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 15:30:07.6 UT, 77.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 52.93173, 37.07845 which is equivalent to:
```
   RA(J2000)  = 03h 31m 43.62s
   Dec(J2000) = +37d 04' 42.4"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 77 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.56 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 2.59e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 86 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.42.
Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Aug 20 16:06:40 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     987016,   Seg_Num: 0
GRB_RA:           52.9317d {+03h 31m 43.60s} (J2000),
                  53.2650d {+03h 33m 03.59s} (current),
                  52.1247d {+03h 28m 29.93s} (1950)
GRB_DEC:         +37.0784d {+37d 04' 42.2"} (J2000),
                 +37.1473d {+37d 08' 50.1"} (current),
                 +36.9090d {+36d 54' 32.4"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19067 TJD;   219 DOY;   20/08/06
IMG_START_TIME:  56165.00 SOD {15:36:05.00} UT,   435.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       137.11d {+09h 08m 27s}  +16.44d {+16d 26' 13"}
SUN_DIST:         75.36 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      352.26d {+23h 29m 02s}   -8.84d {-08d 50' 39"}
MOON_DIST:        73.21 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:      155.15,-15.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       59.73, 17.45 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #28212
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 200806A ( E. Ambrosi et al., GCN 28211) errorbox 17964 sec after notice time and 17986 sec after trigger time at 2020-08-06 20:28:36 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 80 deg. The sun altitude is -26.8 deg.
The galactic latitude b = -15 deg., longitude l = 156 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1414905
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   18076 |      MASTER-Tavrida |   C |   180 | 16.8 |        
   21887 |      MASTER-Tavrida |   C |   180 | 17.5 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #28214
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 619 s of XRT Photon Counting mode data and 1 UVOT images for GRB 200806A, 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 = 52.93214, +37.07876 which is equivalent to:
```
RA (J2000): 03h 31m 43.71s
Dec (J2000): +37d 04' 43.5"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #28215
K. L. Murata, R. Adachi, R. Hosokawa, M. Niwano, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 200806A (Ambrosi et al., GCN 28211; Beardmore et al., GCN 28214) 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 2020-08−06 15:30:34 UT. The first 15 images were heavily affected by the presence of the moon. We stacked the images excluding the 15 images and did not find any new point sources within the enhanced Swift/XRT error circle (Beardmore et al., GCN 28214) of the stacked images. We obtained the 5-sigma limits as follows.
```
T0+[min] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
19 2020-08-06T15:57:10 960 g'>16.7, Rc>16.7, Ic>16.9
------------------------------------------------------------------------------------------------
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 #28216
S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 200806A, which was also detected by Swift (Ambrosi E. et al., GCN #28211), Global MASTER-Net (Lipunov V. et al., GCN #28212) and Swift-XRT (Beardmore A. et al., GCN #28214).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-08-06 15:29:11.500 UT. The measured peak count rate associated with the burst is 665 +/- 33 cts/s above the background in the combined data of four quadrants, with a total of 5023 +/- 36 cts. The local mean background count rate was 402 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 33.93 +/- 0.05 s. In the preliminary analysis, we find that 636 Compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-08-06 15:29:10.000 UT. The measured peak count rate is 987 +/- 50 cts/s above the background in the combined Veto data of four quadrants, with a total of 6708 +/- 67 cts. The local mean background count rate was 1506 +/- 1 cts/s. We measure a T90 of 33.68 +/- 0.13 s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #28218
S. Belkin (IKI), A. Pozanenko (IKI), R.Ya. Inasaridze (AbAO), N. Pankov (HSE), K. Kamyshnikov (HSE), V.R. Ayvazian (AbAO), G.V. Kapanadze (AbAO), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of GRB IKI FuN:
We observed the field of Swift GRB 200806A (Ambrosi et al., GCN 28211) also registered by AstroSat CZTI (Gupta et al., GCN 28216) with AS-32 (0.7m) telescope of Abastumani Observatory starting on 2020-08-06 (UT) 23:42:53. We do not detect any object within the enhanced XRT position error circle (Beardmore et al., GCN 28214). Preliminary photometry of the field is following.
```
Date       UT start  t-T0    Filter Exp.  OT    Err. UL
                     (mid, days)     (s)
2020-08-06 23:42:53  0.36498 R      63*60 n/d   n/d  21.0
```
The photometry is based on nearby USNO-B1.0 stars
```
USNO-B1.0_id R2
1270-0058216 15.48
1270-0058260 14.22
1270-0058260 14.98
1271-0065622 15.31
```
GCN Circular #28221
K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and E. Ambrosi report on behalf of the Swift-XRT team:
We have analysed 5.9 ks of XRT data for GRB 200806A (Ambrosi et al. GCN Circ. 28211), from 84 s to 22.1 ks after the BAT trigger. The data comprise 372 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 28214).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.01 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.58 (+/-0.07). The best-fitting absorption column is 3.6 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 2.6 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.85 (+/-0.14) and a best-fitting absorption column of 4.8 (+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 4.4 x 10^-11 (6.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.8 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 2.6 x 10^21 cm^-2
Excess significance: 4.5 sigma
Photon index:	     1.85 (+/-0.14)
```
If the light curve continues to decay with a power-law decay index of 1.01, the count rate at T+24 hours will be 0.023 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.9 x 10^-13 (1.5 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/00987016.
This circular is an official product of the Swift-XRT team.
GCN Circular #28222
F. E. Marshall (NASA/GSFC) and E. Ambrosi (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200806A 86 s after the BAT trigger (Ambrosi et al., GCN Circ. 28211). A source consistent with the enhanced XRT position (Beardmore et al. GCN Circ. 28214) is marginally detected in the initial UVOT exposures.
The preliminary detection 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               86          236          147         20.26 +/- 0.28
v                  629          821           39        >17.9
b                  555          747           39        >19.3
u                  300          722          265        >19.5
w1                 678          870           39        >18.8
m2                 653          845           39        >19.4
w2                 604         1052           58        >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.42 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #28223
A. Y. Lien (GSFC/UMBC), E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), 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 200806A (trigger #987016) (Ambrosi, et al., GCN Circ. 28211). The BAT ground-calculated position is RA, Dec = 52.933, 37.076 deg which is
```
  RA(J2000)  =  03h 31m 43.9s 
  Dec(J2000) = +37d 04' 33.5" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%.
The mask-weighted light curve shows a multi-peaked structure, with a sharp rise close to T+0 sec. The emission peaked at T+22 sec and declined to background by T+50 sec. T90 (15-350 keV) is 38.8 +- 1.1 sec (estimated error including systematics).
The time-averaged spectrum from T-0.13 to T+61.22 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.72 +- 0.12, and Epeak of 148.1 +- 18.6 keV (chi squared 40.06 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.6 +- 0.02 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+22.24 sec in the 15-150 keV band is 14.1 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.27 +- 0.03 (chi squared 111.98 for 57 d.o.f.). 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/987016/BA/
GCN Circular #28224
P. Gokuldass (UVI), R. Strausbaugh (UVI), D. Morris (UVI), N. Orange (OrangeWave Innovative Science, LLC), A. Cucchiara (UVI/College of Marin) report:
We observed the field of GRB200806A (Ambrosi et al, GCN 28211) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 08-06-2020 starting at 06:22:50 UT (T+15 hrs). We performed a series of exposures in R filter with a total exposure of 5810 s. The weather conditions were clear during the hours of observation with an average airmass of 1.6.
We find no new source within the enhanced XRT position error circle (Beardmore et al., GCN 28214) and report the following 3-sigma upper limit:
```
T_mid      ||Exposure       ||Filter        ||Limit
T+16 hrs   ||5810s          ||R             ||19.6
```
The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase.
This work is supported by NASA-MUREP-MIRO grant NNX15AP95A, NSF EiR AST Award 1901296, and NSF HBCU-UP AST Award 1831682. This message can be cited.
GCN Circular #28227
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), C. C. Thoene, M. Blazek, J. F. Agui Fernandez (all HETH/IAA-CSIC), and L. Montoya (CAHA) report:
We observed the afterglow position (Beardmore et al., GCN #28214; Marshall et al., GCN #28222) of the bright Swift GRB 200806A (Ambrosi et al., GCN #28211; Lien et al., GCN #28223) with CAFOS at the 2.2m telescope at Calar Alto, Almeria, Spain, in the SDSS i' band. We obtained 20 x 180 s exposures, centered at 0.49185 days after the GRB, under good conditions but moonlight.
At the position of the potential UVOT afterglow (Marshall et al., GCN #28222), we detect a faint source not visible in PanSTARRS archival imaging, at position (J2000) RA = 03:31:43.76, Dec. = +37:04:43.90, with an estimated error of 0".75.
Photometry is made complicated by an uneven background, but measured against two nearby SDSS stars, we derive i' = 22.95 +/- 0.25 mag.
As this is significantly fainter than the UVOT detection, we consider this to be the afterglow of GRB 200806A. We note foreground extinction is rather high (E(B-V)=0.3564 mag according to the maps of Schlafly & Finkbeiner 2011), and there is additional hydrogen column density along the line-of-sight (Page et al., GCN #28221), implying this is likely a dark GRB.
GCN Circular #28229
S.Y. Fu, Z.P. Zhu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), X. Zhang, J.Z. Liu (XAO) report:
We observed the field of GRB 200806A (Ambrosiet al., GCN 28211) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 8x100s frames in the Sloan r-band, starting at 19:42:36 UT on 2020-08-07, i.e., 28.22 hr after the burst.
No optical source is detected in our stacked image at the enhanced XRT position (Beardmore et al., GCN 28214), down to a limiting magnitude of r~20.2, calibrated with the nearby PanSTARRS field.
GCN Circular #28234
Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The long GRB 200806A (Swift detection: Ambrosi et al., GCN Circ. 28211, Lien et al., GCN Circ. 28223; AstroSat CZTI detection: Gupta et al., GCN Circ. 28216; https://gcn.gsfc.nasa.gov/other/200806A.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 15:28:52.289 UTC on 6 August 2020. The burst signal was seen by all CGBM detectors. No real-time CGBM GCN notice was distributed about this trigger because the real-time communication from the ISS was off (loss of signal).
The burst light curve shows a multi-peaked structure which starts at T-2.7 sec, peaks at T+20.0 sec and ends at T+40.9 sec. The T90 and T50 durations measured by the SGM data are 33.4 +- 3.1 sec and 14.5 +- 2.0 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1280762930/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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