Gamma-ray Burst 200303A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:35:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.698d {+14h 10m 47s} (J2000),
                 212.880d {+14h 11m 31s} (current),
                 212.245d {+14h 08m 59s} (1950)
GRB_DEC:         +51.360d {+51d 21' 35"} (J2000),
                 +51.265d {+51d 15' 55"} (current),
                 +51.595d {+51d 35' 41"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5817 [cnts]    Image_Peak=451 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       28286 [cnts]
BKG_TIME:        9279.46 SOD {02:34:39.46} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9297.45 SOD {02:34:57.45} UT
GRB_PHI:         172.15 [deg]
GRB_THETA:        35.17 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     34.32 [sigma]
IMAGE_SIGNIF:    14.70 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +3  +0  +0 +50  +0 
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 05"}
SUN_DIST:        120.14 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.11d {+05h 00m 26s}  +21.08d {+21d 05' 04"}
MOON_DIST:        98.72 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.56, 61.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      179.87, 58.30 [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 = 342.42,15.33 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(34.0<100sec) coincident with the FERMI_GBM event (trignum=604895668).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:34:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     604895668
GRB_RA:          212.233d {+14h 08m 56s} (J2000),
                 212.421d {+14h 09m 41s} (current),
                 211.769d {+14h 07m 04s} (1950)
GRB_DEC:         +49.867d {+49d 52' 00"} (J2000),
                 +49.772d {+49d 46' 19"} (current),
                 +50.103d {+50d 06' 10"} (1950)
GRB_ERROR:       8.73 [deg radius, statistical plus systematic]
GRB_INTEN:       197 [cnts/sec]
DATA_SIGNIF:     11.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9263.85 SOD {02:34:23.85} UT
GRB_PHI:         120.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.58
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.69d {-06d 41' 05"}
SUN_DIST:        121.14 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.10d {+05h 00m 25s}  +21.08d {+21d 04' 59"}
MOON_DIST:        99.69 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       94.99, 62.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      181.19, 56.95 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 89.40,-2.43 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:34:29 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     604895668
GRB_RA:          218.800d {+14h 35m 12s} (J2000),
                 218.967d {+14h 35m 52s} (current),
                 218.386d {+14h 33m 33s} (1950)
GRB_DEC:         +52.433d {+52d 25' 60"} (J2000),
                 +52.346d {+52d 20' 45"} (current),
                 +52.651d {+52d 39' 03"} (1950)
GRB_ERROR:       13.33 [deg radius, statistical plus systematic]
GRB_INTEN:       165 [cnts/sec]
DATA_SIGNIF:     7.60 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9263.85 SOD {02:34:23.85} UT
GRB_PHI:         115.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.69d {-06d 41' 06"}
SUN_DIST:        116.31 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:       75.10d {+05h 00m 24s}  +21.08d {+21d 04' 59"}
MOON_DIST:       100.11 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       92.58, 58.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.24, 61.55 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 89.40,-2.43 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:34:41 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     604895668
GRB_RA:          201.680d {+13h 26m 43s} (J2000),
                 201.884d {+13h 27m 32s} (current),
                 201.172d {+13h 24m 41s} (1950)
GRB_DEC:         +52.460d {+52d 27' 36"} (J2000),
                 +52.356d {+52d 21' 21"} (current),
                 +52.719d {+52d 43' 09"} (1950)
GRB_ERROR:       4.34 [deg radius, statistical only]
DATA_SIGNIF:     21.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9263.85 SOD {02:34:23.85} UT
GRB_PHI:         124.00 [deg]
GRB_THETA:       111.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.69d {-06d 41' 05"}
SUN_DIST:        124.96 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       75.10d {+05h 00m 25s}  +21.08d {+21d 04' 60"}
MOON_DIST:        93.23 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      110.70, 63.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      169.11, 54.79 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_604895668.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:35:06 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      89
TRIGGER_NUM:     604895668
GRB_RA:          200.600d {+13h 22m 24s} (J2000),
                 200.801d {+13h 23m 12s} (current),
                 200.101d {+13h 20m 24s} (1950)
GRB_DEC:         +55.533d {+55d 31' 60"} (J2000),
                 +55.428d {+55d 25' 42"} (current),
                 +55.794d {+55d 47' 40"} (1950)
GRB_ERROR:       5.62 [deg radius, statistical plus systematic]
GRB_INTEN:       378 [cnts/sec]
DATA_SIGNIF:     16.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9263.85 SOD {02:34:23.85} UT
GRB_PHI:         122.00 [deg]
GRB_THETA:       115.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.12
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 05"}
SUN_DIST:        123.30 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       75.11d {+05h 00m 26s}  +21.08d {+21d 05' 02"}
MOON_DIST:        90.73 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      113.87, 61.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      164.67, 56.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 89.40,-2.43 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the CALET_GBM event (trignum=1267237773).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:43:39 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     604895668
GRB_RA:          207.440d {+13h 49m 46s} (J2000),
                 207.635d {+13h 50m 32s} (current),
                 206.956d {+13h 47m 49s} (1950)
GRB_DEC:         +50.750d {+50d 45' 00"} (J2000),
                 +50.650d {+50d 39' 02"} (current),
                 +50.998d {+50d 59' 51"} (1950)
GRB_ERROR:       3.80 [deg radius, statistical only]
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9263.85 SOD {02:34:23.85} UT
GRB_PHI:         122.00 [deg]
GRB_THETA:       108.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       344.32d {+22h 57m 16s}   -6.68d {-06d 40' 57"}
SUN_DIST:        123.24 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:       75.19d {+05h 00m 45s}  +21.10d {+21d 05' 53"}
MOON_DIST:        96.94 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      101.70, 63.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.87, 55.74 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_locplot_all_bn200303107.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:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(34.0<100sec) coincident with the SWIFT_BAT event (trignum=959431).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Feb 20 11:21:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     958733,   Seg_Num: 0
POINT_RA:        252.035d {+16h 48m 08s} (J2000)
POINT_DEC:       +16.967d {+16d 58' 01"} (J2000)
POINT_ROLL:      98.037d
IMG_START_DATE:  18907 TJD;    59 DOY;   20/02/28
IMG_START_TIME:  40617.90 SOD {11:16:57.90} UT,   136.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.706
N_STARS:         184
X_OFFSET:        203 [pixels]
Y_OFFSET:        387 [pixels]
X_MAX:           1642 [pixels]
Y_MAX:           1826 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00958733000msufc0136.fits
SUN_POSTN:       340.91d {+22h 43m 38s}   -8.07d {-08d 04' 08"}
SUN_DIST:         91.06 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:       31.31d {+02h 05m 15s}   +7.86d {+07d 51' 29"}
MOON_DIST:       132.53 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:       35.46, 34.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      247.68, 39.02 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:36:51 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.7173d {+14h 10m 52.15s} (J2000),
                 212.8998d {+14h 11m 35.94s} (current),
                 212.2646d {+14h 09m 03.51s} (1950)
GRB_DEC:         +51.3583d {+51d 21' 29.8"} (J2000),
                 +51.2639d {+51d 15' 50.1"} (current),
                 +51.5931d {+51d 35' 35.2"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.77e-09 [erg/cm2/sec]
GRB_SIGNIF:      14.17 [sigma]
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9385.15 SOD {02:36:25.15} UT,   87.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.19 261.65 243.64
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 03"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.12d {+05h 00m 30s}  +21.09d {+21d 05' 13"}
MOON_DIST:        98.73 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.53, 61.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      179.89, 58.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.74 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:39:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.705d {+14h 10m 49s} (J2000)
POINT_DEC:       +51.364d {+51d 21' 51"} (J2000)
POINT_ROLL:      59.200d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9393.61 SOD {02:36:33.61} UT,   96.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.430
N_STARS:         9
X_OFFSET:        440 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1399 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00959431000msufc0096.fits
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 01"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.15d {+05h 00m 35s}  +21.09d {+21d 05' 27"}
MOON_DIST:        98.70 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:37:04 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.7173d {+14h 10m 52.1s} (J2000),
                 212.8998d {+14h 11m 35.9s} (current),
                 212.2646d {+14h 09m 03.5s} (1950)
GRB_DEC:         +51.3583d {+51d 21' 29.8"} (J2000),
                 +51.2639d {+51d 15' 50.1"} (current),
                 +51.5931d {+51d 35' 35.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       201 [cnts]
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9385.15 SOD {02:36:25.15} UT,   87.7 [sec] since BAT Trigger Time
CENTROID_X:      302.14,  raw= 302  [pixels]
CENTROID_Y:      285.28,  raw= 285  [pixels]
ROLL:            59.20 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -30.20
GRB_POS_XRT_Z:   -12.37
IMAGE_URL:       sw00959431000msxps_rw.img
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 03"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.13d {+05h 00m 30s}  +21.09d {+21d 05' 14"}
MOON_DIST:        98.72 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.53, 61.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      179.89, 58.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:39:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.705d {+14h 10m 49s} (J2000)
POINT_DEC:       +51.364d {+51d 21' 51"} (J2000)
POINT_ROLL:      59.200d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9393.61 SOD {02:36:33.61} UT,   96.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.430
N_STARS:         9
X_OFFSET:        440 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1399 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00959431000msufc0096.fits
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 01"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.15d {+05h 00m 36s}  +21.09d {+21d 05' 29"}
MOON_DIST:        98.70 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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 03 Mar 20 02:40:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.705d {+14h 10m 49s} (J2000)
POINT_DEC:       +51.364d {+51d 21' 51"} (J2000)
ROLL:            59.200d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9393.61 SOD {02:36:33.61} UT,   96.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604895818
X_OFFSET:        844 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00959431000msuni0121.fits
SUN_POSTN:       344.32d {+22h 57m 16s}   -6.68d {-06d 41' 00"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.16d {+05h 00m 38s}  +21.09d {+21d 05' 35"}
MOON_DIST:        98.70 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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:     Tue 03 Mar 20 02:36:59 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.7173d {+14h 10m 52.1s} (J2000),
                 212.8998d {+14h 11m 35.9s} (current),
                 212.2646d {+14h 09m 03.5s} (1950)
GRB_DEC:         +51.3583d {+51d 21' 29.8"} (J2000),
                 +51.2639d {+51d 15' 50.1"} (current),
                 +51.5931d {+51d 35' 35.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       201 [cnts]
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9385.15 SOD {02:36:25.15} UT,   87.7 [sec] since BAT Trigger Time
CENTROID_X:      302.14,  raw= 302  [pixels]
CENTROID_Y:      285.28,  raw= 285  [pixels]
ROLL:            59.20 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -30.20
GRB_POS_XRT_Z:   -12.37
IMAGE_URL:       sw00959431000msxps_rw.img
SUN_POSTN:       344.31d {+22h 57m 15s}   -6.68d {-06d 41' 03"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.12d {+05h 00m 30s}  +21.09d {+21d 05' 13"}
MOON_DIST:        98.72 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.53, 61.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      179.89, 58.31 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN Circular #27294
The Fermi GBM team reports the detection of a likely LONG GRB
At 02:34:23 UT on 3 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200303A (trigger 604895668.847358 / 200303107).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 207.4, Dec = 50.8 (J2000 degrees, equivalent to J2000 13h 49m, 50d 47'), with a statistical uncertainty of 3.8 degrees.
The angle from the Fermi LAT boresight is 108.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_skymap_all_bn200303107.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/bn200303107/quicklook/glg_healpix_all_bn200303107.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200303107/quicklook/glg_lc_medres34_bn200303107.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:40:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.705d {+14h 10m 49s} (J2000)
POINT_DEC:       +51.364d {+51d 21' 51"} (J2000)
ROLL:            59.200d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9393.61 SOD {02:36:33.61} UT,   96.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604895818
X_OFFSET:        844 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00959431000msuni0121.fits
SUN_POSTN:       344.32d {+22h 57m 16s}   -6.68d {-06d 41' 00"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.16d {+05h 00m 38s}  +21.09d {+21d 05' 36"}
MOON_DIST:        98.70 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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:     Tue 03 Mar 20 02:46:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.707d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 44"} (J2000)
POINT_ROLL:      59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9605.94 SOD {02:40:05.94} UT,   308.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.358
N_STARS:         9
X_OFFSET:        524 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1483 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00959431000msufc0308.fits
SUN_POSTN:       344.32d {+22h 57m 16s}   -6.68d {-06d 40' 54"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.21d {+05h 00m 50s}  +21.10d {+21d 06' 08"}
MOON_DIST:        98.67 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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 03 Mar 20 02:40:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.698d {+14h 10m 47s} (J2000),
                 212.880d {+14h 11m 31s} (current),
                 212.245d {+14h 08m 59s} (1950)
GRB_DEC:         +51.360d {+51d 21' 35"} (J2000),
                 +51.265d {+51d 15' 55"} (current),
                 +51.595d {+51d 35' 41"} (1950)
GRB_DATE:        18911 TJD;    63 DOY;   20/03/03
GRB_TIME:        9297.45 SOD {02:34:57.45} UT
TRIGGER_INDEX:   146
GRB_PHI:         172.15 [deg]
GRB_THETA:        35.17 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     34.32 [sigma]
IMAGE_SIGNIF:    14.70 [sigma]
LC_URL:          sw00959431000msb.lc
SUN_POSTN:       344.31d {+22h 57m 16s}   -6.68d {-06d 41' 00"}
SUN_DIST:        120.14 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.16d {+05h 00m 38s}  +21.09d {+21d 05' 34"}
MOON_DIST:        98.70 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.56, 61.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      179.87, 58.30 [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 = 342.42,15.33 [deg].

GCN Circular #27295
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-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB200303.11 (trigger No 604895668,13h 49m 45.60s , +50d 45m 00.0s, R=3.8) errorbox 174 sec after notice time and 182 sec after trigger time at 2020-03-03 02:37:26 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 31 deg. The sun altitude is -61.2 deg.
The galactic latitude b = 64 deg., longitude l = 101 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1303204
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     187 | 2020-03-03 02:37:26 |          MASTER-IAC | (14h 09m 12.58s , +51d 33m 11.2s) |  P- |    10 | 16.7 |        
     187 | 2020-03-03 02:37:26 |          MASTER-IAC | (14h 10m 24.06s , +51d 28m 50.4s) |  P| |    10 | 16.3 |        
     216 | 2020-03-03 02:37:49 |          MASTER-IAC | (14h 09m 10.53s , +51d 33m 11.5s) |  P- |    20 | 17.3 |        
     216 | 2020-03-03 02:37:49 |          MASTER-IAC | (14h 10m 21.98s , +51d 28m 50.5s) |  P| |    20 | 17.0 |        
     255 | 2020-03-03 02:38:28 |          MASTER-IAC | (14h 09m 10.64s , +51d 34m 11.7s) |  P- |    20 | 17.3 |        
     255 | 2020-03-03 02:38:28 |          MASTER-IAC | (14h 10m 22.08s , +51d 29m 50.4s) |  P| |    20 | 16.9 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #27296
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-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Swift GRB200303.11 (trigger No 959431,14h 10m 47.52s , +51d 21m 36.0s, R=0.05) errorbox 124 sec after notice time and 148 sec after trigger time at 2020-03-03 02:37:26 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 31 deg. The sun altitude is -61.2 deg.
The galactic latitude b = 62 deg., longitude l = 96 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1303174
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     154 |          MASTER-IAC |  P- |    10 | 16.7 |        
     154 |          MASTER-IAC |  P| |    10 | 16.3 |        
     182 |          MASTER-IAC |  P- |    20 | 17.3 |        
     182 |          MASTER-IAC |  P| |    20 | 17.0 |        
     221 |          MASTER-IAC |  P- |    20 | 17.3 |        
     221 |          MASTER-IAC |  P| |    20 | 16.9 |        
     257 |          MASTER-IAC |  P- |    30 | 17.6 |        
     257 |          MASTER-IAC |  P| |    30 | 17.4 |        
     307 |          MASTER-IAC |  P| |    40 | 17.5 |        
     307 |          MASTER-IAC |  P- |    40 | 17.8 |        
     364 |          MASTER-IAC |  P| |    50 | 17.7 |        
     364 |          MASTER-IAC |  P- |    50 | 18.0 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:45:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.707d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 44"} (J2000)
POINT_ROLL:      59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9605.94 SOD {02:40:05.94} UT,   308.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.358
N_STARS:         9
X_OFFSET:        524 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1483 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00959431000msufc0308.fits
SUN_POSTN:       344.32d {+22h 57m 16s}   -6.68d {-06d 40' 55"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.21d {+05h 00m 50s}  +21.10d {+21d 06' 07"}
MOON_DIST:        98.67 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:52:40 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.706d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 45"} (J2000)
POINT_ROLL:      59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  10161.07 SOD {02:49:21.07} UT,   863.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.508
N_STARS:         54
X_OFFSET:        284 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1723 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00959431000msufc0863.fits
SUN_POSTN:       344.32d {+22h 57m 17s}   -6.68d {-06d 40' 48"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.27d {+05h 01m 05s}  +21.11d {+21d 06' 46"}
MOON_DIST:        98.64 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:52:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.706d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 45"} (J2000)
POINT_ROLL:      59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  10161.07 SOD {02:49:21.07} UT,   863.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.508
N_STARS:         54
X_OFFSET:        284 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1723 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00959431000msufc0863.fits
SUN_POSTN:       344.32d {+22h 57m 18s}   -6.68d {-06d 40' 48"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.27d {+05h 01m 05s}  +21.11d {+21d 06' 48"}
MOON_DIST:        98.63 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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 03 Mar 20 02:53:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.706d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 45"} (J2000)
ROLL:            59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  10161.07 SOD {02:49:21.07} UT,   863.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604896585
X_OFFSET:        843 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw00959431000msuni0888.fits
SUN_POSTN:       344.32d {+22h 57m 18s}   -6.68d {-06d 40' 47"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.28d {+05h 01m 08s}  +21.11d {+21d 06' 53"}
MOON_DIST:        98.63 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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 #27297
S. B. Cenko (GSFC), S. D. Barthelmy (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 02:34:57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200303A (trigger=959431). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 212.698, +51.360, which is
```
   RA(J2000)  =  14h 10m 47s
   Dec(J2000) = +51d 21' 35"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a multi-peak structure with a duration of about 60 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 02:36:25.1 UT, 87.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 212.7173, 51.3583 which is equivalent to:
```
   RA(J2000)  = 14h 10m 52.15s
   Dec(J2000) = +51d 21' 29.9"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 43 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 8.77e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 96 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 0.02.
This source lies within the current (Sector 22) field-of-view of TESS camera 3.
Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Mar 20 02:53:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     959431,   Seg_Num: 0
POINT_RA:        212.706d {+14h 10m 50s} (J2000)
POINT_DEC:       +51.362d {+51d 21' 45"} (J2000)
ROLL:            59.203d
IMG_START_DATE:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  10161.07 SOD {02:49:21.07} UT,   863.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     604896585
X_OFFSET:        843 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw00959431000msuni0888.fits
SUN_POSTN:       344.32d {+22h 57m 18s}   -6.68d {-06d 40' 47"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.28d {+05h 01m 08s}  +21.11d {+21d 06' 54"}
MOON_DIST:        98.63 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.55, 61.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      179.87, 58.31 [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 03 Mar 20 03:12:16 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     959431,   Seg_Num: 0
GRB_RA:          212.7192d {+14h 10m 52.60s} (J2000),
                 212.9016d {+14h 11m 36.39s} (current),
                 212.2665d {+14h 09m 03.97s} (1950)
GRB_DEC:         +51.3592d {+51d 21' 33.1"} (J2000),
                 +51.2648d {+51d 15' 53.3"} (current),
                 +51.5940d {+51d 35' 38.4"} (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:  18911 TJD;    63 DOY;   20/03/03
IMG_START_TIME:  9975.00 SOD {02:46:15.00} UT,   677.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       344.34d {+22h 57m 21s}   -6.68d {-06d 40' 29"}
SUN_DIST:        120.13 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       75.45d {+05h 01m 49s}  +21.14d {+21d 08' 42"}
MOON_DIST:        98.54 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       96.53, 61.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      179.89, 58.31 [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 0.58% < P(seren) < 1.1%.

GCN Circular #27300
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 822 s of XRT Photon Counting mode data and 1 UVOT images for GRB 200303A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 212.71895, +51.35930 which is equivalent to:
```
RA (J2000): 14h 10m 52.55s
Dec (J2000): +51d 21' 33.5"
```
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 #27301
Y. Asaoka (Waseda U), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), S. Torii (Waseda U), Y. Shimizu, 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 200303A (Fermi GBM Final Real-time Localization: Fermi GBM Team, GCN Circ. 27294; Swift detection: Cenko et al., GCN Circ. 27297; https://gcn.gsfc.nasa.gov/other/200303A.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 02:34:20.728 UTC on 3 March 2020. The burst signal was seen by all CGBM detectors.
The burst light curve shows a multi-peaked structure which starts at T+2.3 sec, peaks at T+39.4 sec, and ends at T+88.8 sec. The T90 and T50 durations measured by the SGM data are 68.9 +- 12.8 sec and 28.9 +- 3.3 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1267237773/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #27303
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), D. A. Kann, C. Thoene, J. F. Agui Fernandez, M. Blazek (all HETH/IAA-CSIC), R. Pedro Hedrosa (CAHA) report:
We observed the field of GRB 200303A (Cenko et al. GCN 27297) with CAFOS, on the 2.2 m telescope, at Calar Alto observatory (Almeria, Spain). Observations consisted of 5x360s in R-band with mean epoch 03:48:02 UT (1.249 hr after the burst).
Our initial analysis does not reveal any object within the refined error box (Goad et al. GCN 27300) down to a 3-sigma limit of R(AB) > 24.0 mag, with photometry performed against SDSS field stars.
GCN Circular #27304
Y.-L. Mong (1); K. Ackley (1); D. K. Galloway (1); D. Steeghs (2); V. Dhillon (3); P. O'Brien (4); G. Ramsay (5); D. Pollacco (2); E. Thrane (1); S. Poshyachinda (6); R. Kotak (7); L. Nuttall (8); E. Pall\'e (9); K. Ulaczyk (2); J. Lyman (2); R. Cutter (2); A. Levan (2); T. Marsh (2); R. West (2); E. Stanway (2); B. Gompertz (2); K. Wiersema (2); T. Killestein (2); A. Casey (1); M. Brown (1); B. Muller (1); M. Dyer (3); J. Mullaney (3); E. Daw (3); S. Littlefair (3); J. Maund (3); L. Makrygianni (3); U. Burhanudin (3); R. Starling (4); R. Eyles (4); S. Tooke (4); S. Aukkaravittayapun (6); U. Sawangwit (6); S. Awiphan (6); D. Mkrtichian (6); P. Irawati (6); S. Mattila (7); T. Heikkil\"a (7); E. Rol (1)
((1) Monash University, (2) Warwick University, (3) University of Sheffield, (4) University of Leicester, (5) Armagh Observatory & Planetarium, (6) National Astronomical Research Institute of Thailand, (7) University of Turku, (8) University of Portsmouth, (9) Instituto de Astrofisica de Canarias)
report on behalf of the GOTO collaboration:
We carried out observations with the Gravitational-wave Optical Transient Observer (GOTO), in response to GRB 2000303A (Cenko et al. 2020; GCN #27297; Fermi GBM; GCN #27294).
We made a series of 3 x 60 s exposures using our wide L-band filter (400-700 nm) covering the Swift XRT position (Cenko et al. 2020; GCN #27297), starting at 6.4 minutes after the Swift BAT trigger with midtime 02:52:17 UT on 03 March 2020.
Using a difference imaging analysis with recent survey observations of the same pointings as reference, we identify no viable afterglow candidate. Our mean 5-sigma detection limit was g=19.6 mag based on PS1 catalogue calibrators.
GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT) and the Instituto de Astrofisica de Canarias (IAC) (https://goto-observatory.org)
GCN Circular #27307
Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ), Martin Masek, Petr Janecek, Sergey Karpov, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the GBM/Swift/CALET alert of GRB200303A (Cenko et al, GCNC 27297, Goad et al. GCNC 27300, Asaoka et al. GCNC 27301 and Fermi GBM team GCNC 27294), obtaining a series of 20s unfiltered images starting at 02:35:38.75UT, i.e. 41.3s post trigger.
We do not detect any new source in comparison to USNO-B2.0 catalog neither in single images (3-sigma limit R>~17.9) nor in a combined 20x20s frame (mean exp time 289s post trigger, 3-sigma limit R>~19.5) similarly to de Ugarte et al. (GCNC 27303) and Mong et al. (GCNC 27304)
GCN Circular #27308
A. A. Breeveld (UCL-MSSL) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200303A 96 s after the BAT trigger (Cenko et al., GCN Circ. 27297). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 27300) 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            96          246          147         >20.7
u_FC               308          558          246         >20.4
white               96         5034          550         >21.5
v                 1219         1238           19         >18.4
b                 1144         1163           19         >19.4
u                  308          558          246         >20.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27309
D. Xu (NAOC), L. Izzo (DARK/NBI), D. B. Malesani (DTU Space), A.A. Djupvik (NOT), T. Pursimo (NOT) report on behalf of a larger collaboration: We observed GRB 200303A (Fermi GBM team, GCN 27294, Cenko et al., GCN 27297, Asaoka et al., GCN 27301) with the Nordic Optical Telescope (NOT) equipped with StanCAM, covering 100% of the afterglow region as provided by the Swift-XRT (Cenko et al. 27297). We obtained 3x300 s exposures with the Bessel R filter starting at 03:36:18 UT on March 3 (median time 1.161 hr after the GRB trigger) and 5x200 s exposures with the z-SDSS filter starting at 03:53:59 UT (median time 1.483 hr). We do not detect any optical afterglow candidate down to a limit of R > 23.0 mag (AB) and z > 21.5 mag (AB), calibrated against PS1 catalog.
With the above upper limits, the optical to X-ray spectral index is then beta_OX < -0.09 (Fnu propto nu^-beta) computed assuming the R-Bessel value and X-rays data from Swift-XRT. This suggests a ‘’dark'' nature for GRB 200303A
GCN Circular #27311
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+605 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200303A (trigger #959431) (Cenko, et al., GCN Circ. 27297). The BAT ground-calculated position is RA, Dec = 212.695, 51.358 deg which is
```
  RA(J2000)  =  14h 10m 46.9s 
  Dec(J2000) = +51d 21' 29.3" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 59%.
The burst entered the BAT field of view around T-100 sec during a spacecraft slew. The mask-weighted light curve shows a single episode with multiple pulses, starting at T-45 sec, peaking at the trigger time and returning to near background by T+70 sec. There is extended low-level emission out to nearly T+200 sec. T90 (15-350 keV) is 94.2 +- 6.4 sec (estimated error including systematics).
The time-averaged spectrum from T-36.55 to T+193.26 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.39 +- 0.17, and Epeak of 131.4 +- 75.1 keV (chi squared 46.32 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.3 +- 0.0 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+0.34 sec in the 15-150 keV band is 5.0 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.65 +- 0.04 (chi squared 53.75 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/959431/BA/
GCN Circular #27312
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU) and S.B. Cenko report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 200303A (Cenko et al. GCN Circ. 27297), from 77 s to 41.6 ks after the BAT trigger. The data comprise 582 s in Windowed Timing (WT) mode (the first 9 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 Goad et al. (GCN Circ. 27300).
The late-time light curve (from T0+4.8 ks) can be modelled with a power-law decay with a decay index of alpha=1.27 (+0.09, -0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.41 (+/-0.05). The best-fitting absorption column is 1.10 (+0.05, -0.04) x 10^22 cm^-2, in excess of the Galactic value of 1.6 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.38 (+0.15, -0.14) and a best-fitting absorption column of 7.5 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (8.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.5 (+1.0, -0.9) x 10^21 cm^-2
Galactic foreground: 1.6 x 10^20 cm^-2
Excess significance: 13.4 sigma
Photon index:	     2.38 (+0.15, -0.14)
```
If the light curve continues to decay with a power-law decay index of 1.27, the count rate at T+24 hours will be 0.043 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.6 x 10^-12 (3.8 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/00959431.
This circular is an official product of the Swift-XRT team.
GCN Circular #27314
C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 02:34:23.85 UT on 03 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200303A (trigger 604895668 / 200303107), which was also detected by the Swift/BAT and Swift/XRT (Cenko et al. 2020, GCN 27297, Goad et al. 2020, GCN 27300). The Fermi GBM Final Real-time Localization (GCN 27294) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 106 degrees.
The GBM light curve shows a complex structure with a duration (T90) of about 82 s (50-300 keV). The time-averaged spectrum from T0-2.8 s to T0+95.7 s is best fit by a Band function with Epeak = 151 +/- 18 keV, alpha = -1.26 +/- 0.05, and beta = -2.14 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is (3.23 +/- 0.08)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+35.1 s in the 10-1000 keV band is 9.2 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: 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 #27316
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB200303A (Swift detection of a burst: Cenko et al., GCN 27297; Palmer et al., GCN 27311; CALET Gamma-Ray Burst Monitor detection: Asaoka et al., GCN 27301; Fermi GBM observation: Malacaria & Meegan, GCN 27314) triggered Konus-Wind at T0=9268.336 s UT (02:34:28.336).
The burst light curve shows a multi-peaked structure which starts at ~T0-4.0 s and has a total duration of~67.1 s. The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst had a fluence of 3.88(-1.20,+0.80)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+32.800 s, of 2.38(-0.96,+1.15)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+65.792 s) is best fit in the 20 keV - 3 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.25(-0.21,+0.28), the high energy photon index beta = -2.17(-7.83,+0.18), the peak energy Ep = 154(-44,+82) keV, chi2 = 72/66 dof.
The spectrum near the peak count rate (measured from T0+24.832 to T0+41.216 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.39(-0.14,+0.20), the high energy photon index beta = -2.54(-7.46,+0.45), the peak energy Ep = 183(-53,+54) keV, chi2 = 80/86 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200303_T09268/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 04-Mar-2020 [Disclaimer]