Gamma-ray Burst 200227A

(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 27 Feb 20 07:20:23 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     958592,   Seg_Num: 0
GRB_RA:           56.436d {+03h 45m 45s} (J2000),
                  56.710d {+03h 46m 50s} (current),
                  55.757d {+03h 43m 02s} (1950)
GRB_DEC:          +9.491d {+09d 29' 27"} (J2000),
                  +9.553d {+09d 33' 10"} (current),
                  +9.336d {+09d 20' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3397 [cnts]    Image_Peak=198 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       20628 [cnts]
BKG_TIME:        26391.49 SOD {07:19:51.49} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.00 SOD {07:20:08.00} UT
GRB_PHI:         -22.82 [deg]
GRB_THETA:        42.23 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.78 [sigma]
IMAGE_SIGNIF:    10.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +0 -20  +0 
SUN_POSTN:       339.81d {+22h 39m 14s}   -8.51d {-08d 30' 30"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.53d {+01h 14m 07s}   +2.51d {+02d 30' 33"}
MOON_DIST:        38.58 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.13,-34.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.36,-10.12 [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 = 157.90,-6.71 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=604480813).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:20:48 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     604480813
GRB_RA:           58.233d {+03h 52m 56s} (J2000),
                  58.500d {+03h 54m 00s} (current),
                  57.572d {+03h 50m 17s} (1950)
GRB_DEC:          +5.183d {+05d 10' 60"} (J2000),
                  +5.242d {+05d 14' 32"} (current),
                  +5.035d {+05d 02' 07"} (1950)
GRB_ERROR:       5.65 [deg radius, statistical plus systematic]
GRB_INTEN:       372 [cnts/sec]
DATA_SIGNIF:     33.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.70 SOD {07:20:08.70} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       339.81d {+22h 39m 14s}   -8.51d {-08d 30' 30"}
SUN_DIST:         79.65 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:       18.53d {+01h 14m 08s}   +2.51d {+02d 30' 38"}
MOON_DIST:        39.96 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      183.53,-35.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.17,-14.71 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 158.28,-24.52 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=958592).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:20:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     604480813
GRB_RA:           57.883d {+03h 51m 32s} (J2000),
                  58.150d {+03h 52m 36s} (current),
                  57.222d {+03h 48m 53s} (1950)
GRB_DEC:          +5.117d {+05d 07' 00"} (J2000),
                  +5.176d {+05d 10' 34"} (current),
                  +4.967d {+04d 58' 02"} (1950)
GRB_ERROR:       8.48 [deg radius, statistical plus systematic]
GRB_INTEN:       131 [cnts/sec]
DATA_SIGNIF:     8.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.70 SOD {07:20:08.70} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.61
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   6%  GRO_J0422_32
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       339.81d {+22h 39m 14s}   -8.51d {-08d 30' 30"}
SUN_DIST:         79.30 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:       18.53d {+01h 14m 08s}   +2.51d {+02d 30' 35"}
MOON_DIST:        39.61 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      183.32,-35.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.81,-14.70 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 158.28,-24.52 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=958592).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:20:49 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     604480813
GRB_RA:           57.640d {+03h 50m 34s} (J2000),
                  57.909d {+03h 51m 38s} (current),
                  56.975d {+03h 47m 54s} (1950)
GRB_DEC:          +6.150d {+06d 09' 00"} (J2000),
                  +6.210d {+06d 12' 35"} (current),
                  +6.000d {+05d 59' 59"} (1950)
GRB_ERROR:       1.71 [deg radius, statistical only]
DATA_SIGNIF:     14.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.70 SOD {07:20:08.70} UT
GRB_PHI:          74.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       339.81d {+22h 39m 14s}   -8.51d {-08d 30' 30"}
SUN_DIST:         79.24 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:       18.53d {+01h 14m 08s}   +2.51d {+02d 30' 38"}
MOON_DIST:        39.42 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      182.15,-35.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.80,-13.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_604480813.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=958592).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:20:43 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     604480813
GRB_RA:           58.117d {+03h 52m 28s} (J2000),
                  58.384d {+03h 53m 32s} (current),
                  57.455d {+03h 49m 49s} (1950)
GRB_DEC:          +5.150d {+05d 09' 00"} (J2000),
                  +5.209d {+05d 12' 33"} (current),
                  +5.002d {+05d 00' 06"} (1950)
GRB_ERROR:       5.97 [deg radius, statistical plus systematic]
GRB_INTEN:       317 [cnts/sec]
DATA_SIGNIF:     21.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.70 SOD {07:20:08.70} UT
GRB_PHI:          75.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.97
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   2%  GRO_J0422_32
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       339.81d {+22h 39m 14s}   -8.51d {-08d 30' 30"}
SUN_DIST:         79.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:       18.53d {+01h 14m 08s}   +2.51d {+02d 30' 37"}
MOON_DIST:        39.84 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      183.47,-35.66 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.05,-14.72 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 158.28,-24.52 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=958592).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:29:32 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     604480813
GRB_RA:           56.890d {+03h 47m 34s} (J2000),
                  57.159d {+03h 48m 38s} (current),
                  56.224d {+03h 44m 54s} (1950)
GRB_DEC:          +6.260d {+06d 15' 36"} (J2000),
                  +6.321d {+06d 19' 16"} (current),
                  +6.107d {+06d 06' 24"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27
GRB_TIME:        26408.70 SOD {07:20:08.70} UT
GRB_PHI:          71.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 22"}
SUN_DIST:         78.52 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:       18.60d {+01h 14m 24s}   +2.54d {+02d 32' 20"}
MOON_DIST:        38.62 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      181.46,-35.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.08,-13.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_locplot_all_bn200227306.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=958592).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:21:56 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     958592,   Seg_Num: 0
GRB_RA:           56.4348d {+03h 45m 44.35s} (J2000),
                  56.7087d {+03h 46m 50.09s} (current),
                  55.7560d {+03h 43m 01.44s} (1950)
GRB_DEC:          +9.4814d {+09d 28' 53.0"} (J2000),
                  +9.5432d {+09d 32' 35.5"} (current),
                  +9.3261d {+09d 19' 33.9"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.08e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.19 [sigma]
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26490.19 SOD {07:21:30.19} UT,   82.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.18 261.62 243.71
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 29"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.54d {+01h 14m 10s}   +2.51d {+02d 30' 51"}
MOON_DIST:        38.57 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the burst
ECL_COORDS:       56.36,-10.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.57 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:22:09 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
GRB_RA:           56.4348d {+03h 45m 44.3s} (J2000),
                  56.7087d {+03h 46m 50.0s} (current),
                  55.7560d {+03h 43m 01.4s} (1950)
GRB_DEC:          +9.4814d {+09d 28' 53.0"} (J2000),
                  +9.5432d {+09d 32' 35.5"} (current),
                  +9.3261d {+09d 19' 33.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       104 [cnts]
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26490.19 SOD {07:21:30.19} UT,   82.2 [sec] since BAT Trigger Time
CENTROID_X:      298.95,  raw= 299  [pixels]
CENTROID_Y:      303.76,  raw= 304  [pixels]
ROLL:            259.21 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.34
GRB_POS_XRT_Z:   -19.91
IMAGE_URL:       sw00958592000msxps_rw.img
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 29"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.54d {+01h 14m 11s}   +2.51d {+02d 30' 54"}
MOON_DIST:        38.57 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the burst
ECL_COORDS:       56.36,-10.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:26:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604480925
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0118.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 25"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.58d {+01h 14m 18s}   +2.53d {+02d 31' 44"}
MOON_DIST:        38.54 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:24:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.649
N_STARS:         23
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0093.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 26"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.56d {+01h 14m 15s}   +2.52d {+02d 31' 22"}
MOON_DIST:        38.55 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:22:05 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     958592,   Seg_Num: 0
GRB_RA:           56.4348d {+03h 45m 44.3s} (J2000),
                  56.7087d {+03h 46m 50.0s} (current),
                  55.7560d {+03h 43m 01.4s} (1950)
GRB_DEC:          +9.4814d {+09d 28' 53.0"} (J2000),
                  +9.5432d {+09d 32' 35.5"} (current),
                  +9.3261d {+09d 19' 33.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       104 [cnts]
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26490.19 SOD {07:21:30.19} UT,   82.2 [sec] since BAT Trigger Time
CENTROID_X:      298.95,  raw= 299  [pixels]
CENTROID_Y:      303.76,  raw= 304  [pixels]
ROLL:            259.21 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.34
GRB_POS_XRT_Z:   -19.91
IMAGE_URL:       sw00958592000msxps_rw.img
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 29"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.54d {+01h 14m 11s}   +2.51d {+02d 30' 53"}
MOON_DIST:        38.57 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the burst
ECL_COORDS:       56.36,-10.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Thu 27 Feb 20 07:24:10 UT 
NOTICE_TYPE:     Swift-BAT GRB Lightcurve 
TRIGGER_NUM:     958592,   Seg_Num: 0 
GRB_RA:           56.436d {+03h 45m 45s} (J2000), 
                  56.710d {+03h 46m 50s} (current), 
                  55.757d {+03h 43m 02s} (1950) 
GRB_DEC:          +9.491d {+09d 29' 27"} (J2000), 
                  +9.553d {+09d 33' 10"} (current), 
                  +9.336d {+09d 20' 08"} (1950) 
GRB_DATE:        18906 TJD;    58 DOY;   20/02/27 
GRB_TIME:        26408.00 SOD {07:20:08.00} UT 
TRIGGER_INDEX:   146 
GRB_PHI:         -22.82 [deg]
GRB_THETA:        42.23 [deg] 
DELTA_TIME:      -50.00 [sec] 
TRIGGER_DUR:     1.024 [sec]  
SOLN_STATUS:     0x3 
RATE_SIGNIF:     13.78 [sigma] 
IMAGE_SIGNIF:    10.47 [sigma] 
LC_URL:          sw00958592000msb.lc 
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 27"} 
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun) 
MOON_POSTN:       18.56d {+01h 14m 14s}   +2.52d {+02d 31' 17"} 
MOON_DIST:        38.55 [deg] 
MOON_ILLUM:      12 [%] 
GAL_COORDS:      178.13,-34.11 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:       56.36,-10.12 [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 = 157.90,-6.71 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:31:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.042
N_STARS:         8
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00958592000msufc0305.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 20"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.62d {+01h 14m 28s}   +2.55d {+02d 32' 47"}
MOON_DIST:        38.49 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:26:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604480925
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0118.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 25"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.58d {+01h 14m 19s}   +2.53d {+02d 31' 45"}
MOON_DIST:        38.54 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:33:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     604481137
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0330.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 18"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.63d {+01h 14m 31s}   +2.55d {+02d 33' 04"}
MOON_DIST:        38.48 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:39:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.484d {+09d 29' 03"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  27268.99 SOD {07:34:28.99} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.652
N_STARS:         70
X_OFFSET:        269 [pixels]
Y_OFFSET:        283 [pixels]
X_MAX:           1708 [pixels]
Y_MAX:           1722 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0860.fits
SUN_POSTN:       339.82d {+22h 39m 17s}   -8.50d {-08d 30' 12"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.68d {+01h 14m 42s}   +2.57d {+02d 34' 17"}
MOON_DIST:        38.43 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #27233
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:20:08 UT on 27 Feb 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200227A (trigger 604480813.702942 / 200227306).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 56.9, Dec = 6.3 (J2000 degrees, equivalent to J2000 03h 47m, 6d 17'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 19.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_skymap_all_bn200227306.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_healpix_all_bn200227306.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200227306/quicklook/glg_lc_medres34_bn200227306.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:39:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.484d {+09d 29' 03"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  27268.99 SOD {07:34:28.99} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.652
N_STARS:         70
X_OFFSET:        269 [pixels]
Y_OFFSET:        283 [pixels]
X_MAX:           1708 [pixels]
Y_MAX:           1722 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0860.fits
SUN_POSTN:       339.82d {+22h 39m 17s}   -8.50d {-08d 30' 12"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.68d {+01h 14m 43s}   +2.57d {+02d 34' 20"}
MOON_DIST:        38.43 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:41:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.484d {+09d 29' 03"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  27268.99 SOD {07:34:28.99} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604481693
X_OFFSET:        828 [pixels]
Y_OFFSET:        842 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       988
Y_GRB_POS:       1002
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0885.fits
SUN_POSTN:       339.82d {+22h 39m 18s}   -8.50d {-08d 30' 11"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.69d {+01h 14m 46s}   +2.58d {+02d 34' 39"}
MOON_DIST:        38.42 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:33:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     604481137
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0330.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 18"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.63d {+01h 14m 31s}   +2.55d {+02d 33' 05"}
MOON_DIST:        38.48 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:41:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.484d {+09d 29' 03"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  27268.99 SOD {07:34:28.99} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604481693
X_OFFSET:        828 [pixels]
Y_OFFSET:        842 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       988
Y_GRB_POS:       1002
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0885.fits
SUN_POSTN:       339.82d {+22h 39m 18s}   -8.50d {-08d 30' 11"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.69d {+01h 14m 45s}   +2.58d {+02d 34' 38"}
MOON_DIST:        38.42 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 Circular #27234
S. Laha (GSFC/UMBC/CRESST), C. Gronwall (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 07:20:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200227A (trigger=958592). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 56.436, +9.491 which is
```
   RA(J2000) = 03h 45m 45s
   Dec(J2000) = +09d 29' 27"
```
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 40 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~8 sec after the trigger.
The XRT began observing the field at 07:21:30.1 UT, 82.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 56.43302, 9.48264 which is equivalent to:
```
   RA(J2000)  = 03h 45m 43.92s
   Dec(J2000) = +09d 28' 57.5"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 31 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 2.12 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 3.08e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 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 0.27.
Burst Advocate for this burst is S. Laha (sib.laha AT gmail.com). 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 27 Feb 20 07:32:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.042
N_STARS:         8
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00958592000msufc0305.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 19"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.62d {+01h 14m 29s}   +2.55d {+02d 32' 50"}
MOON_DIST:        38.49 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:32:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.042
N_STARS:         8
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00958592000msufc0305.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 19"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.62d {+01h 14m 29s}   +2.55d {+02d 32' 50"}
MOON_DIST:        38.49 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:56:51 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     958592,   Seg_Num: 0
GRB_RA:           56.4331d {+03h 45m 43.94s} (J2000),
                  56.7070d {+03h 46m 49.69s} (current),
                  55.7543d {+03h 43m 01.03s} (1950)
GRB_DEC:          +9.4823d {+09d 28' 56.2"} (J2000),
                  +9.5441d {+09d 32' 38.8"} (current),
                  +9.3270d {+09d 19' 37.1"} (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:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26582.00 SOD {07:23:02.00} UT,   174.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       339.83d {+22h 39m 20s}   -8.50d {-08d 29' 56"}
SUN_DIST:         78.64 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.81d {+01h 15m 13s}   +2.63d {+02d 37' 38"}
MOON_DIST:        38.29 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the burst
ECL_COORDS:       56.36,-10.12 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:24:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.649
N_STARS:         23
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0093.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 26"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.56d {+01h 14m 16s}   +2.52d {+02d 31' 25"}
MOON_DIST:        38.55 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:24:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.649
N_STARS:         23
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0093.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 26"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.56d {+01h 14m 16s}   +2.52d {+02d 31' 25"}
MOON_DIST:        38.55 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:33:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     604481137
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0330.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 18"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.63d {+01h 14m 31s}   +2.55d {+02d 33' 05"}
MOON_DIST:        38.48 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:24:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.649
N_STARS:         23
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0093.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 26"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.56d {+01h 14m 16s}   +2.52d {+02d 31' 25"}
MOON_DIST:        38.55 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:33:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     604481137
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0330.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 18"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.63d {+01h 14m 31s}   +2.55d {+02d 33' 05"}
MOON_DIST:        38.48 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Feb 20 07:24:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.439d {+03h 45m 45s} (J2000)
POINT_DEC:        +9.486d {+09d 29' 10"} (J2000)
POINT_ROLL:      259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26501.18 SOD {07:21:41.18} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.649
N_STARS:         23
X_OFFSET:        509 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1468 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00958592000msufc0093.fits
SUN_POSTN:       339.81d {+22h 39m 15s}   -8.51d {-08d 30' 26"}
SUN_DIST:         78.67 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.56d {+01h 14m 16s}   +2.52d {+02d 31' 25"}
MOON_DIST:        38.55 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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 27 Feb 20 07:33:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     958592,   Seg_Num: 0
POINT_RA:         56.441d {+03h 45m 46s} (J2000)
POINT_DEC:        +9.485d {+09d 29' 05"} (J2000)
ROLL:            259.212d
IMG_START_DATE:  18906 TJD;    58 DOY;   20/02/27
IMG_START_TIME:  26713.17 SOD {07:25:13.17} UT,   305.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     604481137
X_OFFSET:        829 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       989
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00958592000msuni0330.fits
SUN_POSTN:       339.82d {+22h 39m 16s}   -8.51d {-08d 30' 18"}
SUN_DIST:         78.66 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       18.63d {+01h 14m 31s}   +2.55d {+02d 33' 05"}
MOON_DIST:        38.48 [deg]
MOON_ILLUM:      12 [%]
GAL_COORDS:      178.14,-34.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.37,-10.12 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #27236
M. Oeda, R. Adachi, K. L. Murata, K. Shiraishi, K. Iida, M. Niwano, F. Ogawa, S. Toma, R. Hosokawa, N. Nakamura, Y. Yatsu, and N. Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 200227A (Fermi GBM Team et al.,GCN Circular #27233, S. Laha et al., GCN Circular #27234) 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 started on 09:05:08 UT. We did not find any new point sources within the Swift/XRT circle (S. Laha et al., GCN Circular #27234) in all three bands. We obtained the 5-sigma limits as follows.
```
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
2.2   09:41:13  900  g’>18.4,Rc>18.2,Ic>17.5
------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used UCAC4 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. ,in prep; https://github.com/MNiwano/Eclair)
GCN Circular #27239
E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team:
"At 07:20:08.70 UT on 27 February 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200227A (trigger 604480813 / 200227306), which was also detected by the Swift/BAT (Laha et al. 2020, GCN 27234). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 19 degrees.
The GBM light curve shows a single broad peak with a duration (T90) of about 24 s (50-300 keV). The time-averaged spectrum from T0 to T0+24 s is adequately fit by a Band function with Epeak = 139 +/- 10 keV, alpha = -0.95 +/- 0.05, and beta = -2.28 +/- 0.11.
The event fluence (10-1000 keV) in this time interval is (1.41 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.1 s in the 10-1000 keV band is 8.8 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #27243
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 702 s of XRT Photon Counting mode data and 2 UVOT images for GRB 200227A, 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 = 56.43275, +9.48230 which is equivalent to:
```
RA (J2000): 03h 45m 43.86s
Dec (J2000): +09d 28' 56.3"
```
with an uncertainty of 2.5 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 #27244
S. R. Oates (U. Birmingham) and S. Laha (GSFC/UMBC/CRESST) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200227A 93 s after the BAT trigger (Laha et al., GCN Circ. 27234). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 27243) 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          93          243          147        >20.3
u_FC              305	      555          246        >19.7
white	          93	      1185         353        >20.8
v	          634	      1235         78         >18.3
b	          560	      1160         58         >19.2
u                 305	      1135         285        >19.8
w1                685	      1284         58         >18.4
m2                659         1259         78         >18.4
w2                610         1210         78         >18.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the significant reddening of E(B-V) = 0.28 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27246
J. R. Cummings (CPI), 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), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 200227A (trigger #958592) (Laha, et al., GCN Circ. 27234). The BAT ground-calculated position is RA, Dec = 56.433, 9.489 deg, which is
```
   RA(J2000)  =  03h 45m 43.9s 
   Dec(J2000) = +09d 29' 22.0" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The mask-weighted light curve a couple overlapping peaks starting at T-10 sec, peaking at T+8 sec, and ending at T+90 sec. T90 (15-350 keV) is 32.8 +- 9.7 sec (estimated error including systematics).
The time-averaged spectrum from T-0.50 to T+87.64 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.15 +- 0.19, and Epeak of 156.4 +- 88.9 keV (chi squared 55.3 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 7.1 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+8.54 sec in the 15-150 keV band is 5.7 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.46 +- 0.05 (chi squared 63.6 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/958592/BA/
GCN Circular #27249
J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU) and S. Laha (GSFC/UMBC/CRESST) report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 200227A (Laha et al. GCN Circ. 27234), from 72 s to 29.1 ks after the BAT trigger. The data comprise 288 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 27243).
The light curve can be modelled with an initial power-law decay with an index of alpha=3.86 (+0.21, -0.16), followed by a break at T+169 s to an alpha of 1.09 (+0.07, -0.05).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.88 (+0.08, -0.07). The best-fitting absorption column is 5.9 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 2.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.83 (+0.17, -0.16) and a best-fitting absorption column of 5.6 (+1.1, -1.0) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.6 x 10^-11 (6.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.6 (+1.1, -1.0) x 10^21 cm^-2
Galactic foreground: 2.1 x 10^21 cm^-2
Excess significance: 5.7 sigma
Photon index:	     1.83 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 1.09, the count rate at T+24 hours will be 4.8 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-13 (3.3 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/00958592.
This circular is an official product of the Swift-XRT team.
GCN Circular #27251
Q. Luo, Y. G. Zheng, C. Cai, S. Xiao, Q. B. Yi, Y. F. DU, W. C. Xue, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2020-02-27T07:20:16.15 (T0), Insight-HXMT/HE detected GRB 200227A (trigger ID: HEB200227305) in a routine search of the data, which was also detected by Fermi/GBM (GCN #27233) and Swift-BAT (GCN #27234).
The Insight-HXMT/HE light curve mainly consists of two pulses with a duration (T90) of 37.71 s measured from T0-6.92 s. The 1-ms peak rate, measured from T0+1.169 s, is 1862 cnts/sec. The total counts from this burst is 19259 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB200227305_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.
GCN Circular #27257
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200227A (Fermi GBM Team et al., GCN 27233; Laha et al., GCN 27234) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Feb. 27 (UT) 12:47:07. Within enhanced Swift-XRT position of afterglow (Beardmore et al., GCN 27243) we did not detect optical afterglow in agreement with previously reported non-detection (Oeda et al., GCN 27236; Oates et al., GCN 27244). Preliminary photometry of the field is following.
```
Date UT start,      t-T0    Filter Exp.   OT UL(3sigma)
                      (mid, days)    (s)
2020-02-27 12:47:07 0.24582  R   27*120 n/d 23.2
```
Photometry is based on the SDSS-DR12 nearby stars (Lupton’s transformation)
```
SDSS-DR12_id        R(Lupton)
J034542.04+092727.3 18.56
J034546.87+092955.7 17.19
J034534.13+092646.2 17.32
```
GCN Circular #27265
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes�s Gonz�lez (UNAM), Carlos Rom�n-Z��iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 200227A (Laha et al., GCN Circ. 27234) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron�mico Nacional on Sierra San Pedro M�rtir from 2020/02 28.17 to 2020/02 28.24 UTC (20.84 to 22.53 hours after the BAT trigger), obtaining a total of 0.69 hours exposure in the r and i bands.
For a source within the Swift-XRT enhanced error circle (Beardmore et al., GCN Circ. 27243), in comparison with the SDSS DR9, we obtain the following upper limits (3-sigma):
```
  r	> 19.73
  i	> 20.33
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron�mico Nacional in San Pedro M�rtir.

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Jochen Greiner, last update: 28-Feb-2020 [Disclaimer]