Gamma-ray Burst 190220A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 20 Feb 19 02:59:48 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     889785,   Seg_Num: 0 
GRB_RA:          330.142d {+22h 00m 34s} (J2000), 
                 330.609d {+22h 02m 26s} (current), 
                 328.899d {+21h 55m 36s} (1950) 
GRB_DEC:         -76.691d {-76d 41' 27"} (J2000), 
                 -76.598d {-76d 35' 53"} (current), 
                 -76.931d {-76d 55' 50"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       2717 [cnts]    Image_Peak=158 [image_cnts] 
TRIGGER_DUR:     1.024 [sec]  
TRIGGER_INDEX:   139     E_range: 15-50 keV 
BKG_INTEN:       16189 [cnts] 
BKG_TIME:        10761.55 SOD {02:59:21.55} UT 
BKG_DUR:         8 [sec] 
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20 
GRB_TIME:        10774.67 SOD {02:59:34.67} UT 
GRB_PHI:         -143.37 [deg] 
GRB_THETA:        38.17 [deg] 
SOLN_STATUS:     0x3 
RATE_SIGNIF:     14.56 [sigma] 
IMAGE_SIGNIF:    9.05 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +0  +1  +0  +0  +0 -41  +0  
SUN_POSTN:       333.21d {+22h 12m 50s}  -11.06d {-11d 03' 19"} 
SUN_DIST:         65.56 [deg]   Sun_angle= 0.2 [hr] (West of Sun) 
MOON_POSTN:      160.89d {+10h 43m 34s}  +11.77d {+11d 46' 20"} 
MOON_DIST:       114.94 [deg] 
MOON_ILLUM:      100 [%] 
GAL_COORDS:      314.13,-36.46 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      292.08,-57.91 [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 = 216.92,-18.70 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 20 Feb 19 03:01:20 UT 
NOTICE_TYPE:     Swift-XRT Position 
TRIGGER_NUM:     889785,   Seg_Num: 0 
GRB_RA:          330.1889d {+22h 00m 45.33s} (J2000), 
                 330.6555d {+22h 02m 37.31s} (current), 
                 328.9471d {+21h 55m 47.31s} (1950) 
GRB_DEC:         -76.6832d {-76d 40' 59.5"} (J2000), 
                 -76.5905d {-76d 35' 25.9"} (current), 
                 -76.9233d {-76d 55' 23.7"} (1950) 
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment] 
GRB_INTEN:       1.61e-09 [erg/cm2/sec] 
GRB_SIGNIF:      8.42 [sigma] 
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20 
IMG_START_TIME:  10855.54 SOD {03:00:55.54} UT,   80.9 [sec] since BAT Trigger Time 
TAM[0-3]:        327.69 237.21 261.71 243.50 
AMPLIFIER:       2 
WAVEFORM:        134 
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.06d {-11d 03' 17"} 
SUN_DIST:         65.55 [deg]   Sun_angle= 0.2 [hr] (West of Sun) 
MOON_POSTN:      160.91d {+10h 43m 38s}  +11.77d {+11d 46' 02"} 
MOON_DIST:       114.95 [deg] 
MOON_ILLUM:      100 [%] 
GAL_COORDS:      314.13,-36.47 [deg] galactic lon,lat of the burst 
ECL_COORDS:      292.10,-57.92 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Coordinates.   
COMMENTS:        The XRT position is 0.79 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:01:30 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     889785,   Seg_Num: 0
GRB_RA:          330.1889d {+22h 00m 45.3s} (J2000),
                 330.6555d {+22h 02m 37.3s} (current),
                 328.9471d {+21h 55m 47.3s} (1950)
GRB_DEC:         -76.6832d {-76d 40' 59.5"} (J2000),
                 -76.5905d {-76d 35' 25.9"} (current),
                 -76.9233d {-76d 55' 23.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       71 [cnts]
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10855.54 SOD {03:00:55.54} UT,   80.9 [sec] since BAT Trigger Time
CENTROID_X:      258.26,  raw= 258  [pixels]
CENTROID_Y:      276.97,  raw= 277  [pixels]
ROLL:            3.32 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -50.51
GRB_POS_XRT_Z:   -113.47
IMAGE_URL:       sw00889785000msxps_rw.img
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.06d {-11d 03' 17"}
SUN_DIST:         65.55 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.91d {+10h 43m 38s}  +11.77d {+11d 45' 60"}
MOON_DIST:       114.95 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.13,-36.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      292.10,-57.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:01:33 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     889785,   Seg_Num: 0
GRB_RA:          330.1889d {+22h 00m 45.3s} (J2000),
                 330.6555d {+22h 02m 37.3s} (current),
                 328.9471d {+21h 55m 47.3s} (1950)
GRB_DEC:         -76.6832d {-76d 40' 59.5"} (J2000),
                 -76.5905d {-76d 35' 25.9"} (current),
                 -76.9233d {-76d 55' 23.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       71 [cnts]
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10855.54 SOD {03:00:55.54} UT,   80.9 [sec] since BAT Trigger Time
CENTROID_X:      258.26,  raw= 258  [pixels]
CENTROID_Y:      276.97,  raw= 277  [pixels]
ROLL:            3.32 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -50.51
GRB_POS_XRT_Z:   -113.47
IMAGE_URL:       sw00889785000msxps_rw.img
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.06d {-11d 03' 17"}
SUN_DIST:         65.55 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.91d {+10h 43m 38s}  +11.77d {+11d 45' 59"}
MOON_DIST:       114.95 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.13,-36.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      292.10,-57.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:04:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.121d {+22h 00m 29s} (J2000)
POINT_DEC:       -76.714d {-76d 42' 49"} (J2000)
POINT_ROLL:      3.321d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10861.28 SOD {03:01:01.28} UT,   86.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.054
N_STARS:         53
X_OFFSET:        640 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00889785000msufc0086.fits
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.05d {-11d 03' 15"}
SUN_DIST:         65.58 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.93d {+10h 43m 44s}  +11.76d {+11d 45' 29"}
MOON_DIST:       114.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:04:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.121d {+22h 00m 29s} (J2000)
POINT_DEC:       -76.714d {-76d 42' 49"} (J2000)
POINT_ROLL:      3.321d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10861.28 SOD {03:01:01.28} UT,   86.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.054
N_STARS:         53
X_OFFSET:        640 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00889785000msufc0086.fits
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.05d {-11d 03' 15"}
SUN_DIST:         65.58 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.94d {+10h 43m 45s}  +11.76d {+11d 45' 26"}
MOON_DIST:       114.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:06:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.121d {+22h 00m 29s} (J2000)
POINT_DEC:       -76.714d {-76d 42' 49"} (J2000)
ROLL:            3.321d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10861.28 SOD {03:01:01.28} UT,   86.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     572324483
X_OFFSET:        1045 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1205
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0109.fits
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.05d {-11d 03' 12"}
SUN_DIST:         65.58 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.96d {+10h 43m 51s}  +11.75d {+11d 44' 56"}
MOON_DIST:       114.89 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [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:     Wed 20 Feb 19 03:06:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     889785,   Seg_Num: 0
GRB_RA:          330.142d {+22h 00m 34s} (J2000),
                 330.609d {+22h 02m 26s} (current),
                 328.899d {+21h 55m 36s} (1950)
GRB_DEC:         -76.691d {-76d 41' 27"} (J2000),
                 -76.598d {-76d 35' 53"} (current),
                 -76.931d {-76d 55' 50"} (1950)
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20
GRB_TIME:        10774.67 SOD {02:59:34.67} UT
TRIGGER_INDEX:   139
GRB_PHI:         -143.37 [deg]
GRB_THETA:        38.17 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.56 [sigma]
IMAGE_SIGNIF:    9.05 [sigma]
LC_URL:          sw00889785000msb.lc
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.05d {-11d 03' 12"}
SUN_DIST:         65.56 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.96d {+10h 43m 51s}  +11.75d {+11d 44' 55"}
MOON_DIST:       114.92 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.13,-36.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      292.08,-57.91 [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 = 216.92,-18.70 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:07:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.121d {+22h 00m 29s} (J2000)
POINT_DEC:       -76.714d {-76d 42' 49"} (J2000)
ROLL:            3.321d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10861.28 SOD {03:01:01.28} UT,   86.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     572324483
X_OFFSET:        1045 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1205
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0109.fits
SUN_POSTN:       333.21d {+22h 12m 51s}  -11.05d {-11d 03' 12"}
SUN_DIST:         65.58 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.97d {+10h 43m 52s}  +11.75d {+11d 44' 53"}
MOON_DIST:       114.89 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [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:     Wed 20 Feb 19 03:08:02 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     889785,   Seg_Num: 0
GRB_RA:          330.1630d {+22h 00m 39.12s} (J2000),
                 330.6297d {+22h 02m 31.12s} (current),
                 328.9209d {+21h 55m 41.01s} (1950)
GRB_DEC:         -76.6806d {-76d 40' 50.1"} (J2000),
                 -76.5880d {-76d 35' 16.6"} (current),
                 -76.9206d {-76d 55' 14.1"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         19.29 +/- 0.16 [mag]
FILTER:          10, White
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10858.00 SOD {03:00:58.00} UT,   83.3 [sec] since BAT Trigger Time
SUN_POSTN:       333.21d {+22h 12m 52s}  -11.05d {-11d 03' 11"}
SUN_DIST:         65.55 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      160.98d {+10h 43m 54s}  +11.74d {+11d 44' 41"}
MOON_DIST:       114.92 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.13,-36.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      292.10,-57.91 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 23.0 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:13:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.131d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
POINT_ROLL:      3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11073.39 SOD {03:04:33.39} UT,   298.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.538
N_STARS:         29
X_OFFSET:        725 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1684 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00889785000msufc0298.fits
SUN_POSTN:       333.22d {+22h 12m 53s}  -11.05d {-11d 03' 06"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.04d {+10h 44m 09s}  +11.73d {+11d 43' 30"}
MOON_DIST:       114.87 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:14:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.131d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
POINT_ROLL:      3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11073.39 SOD {03:04:33.39} UT,   298.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.538
N_STARS:         29
X_OFFSET:        725 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1684 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00889785000msufc0298.fits
SUN_POSTN:       333.22d {+22h 12m 53s}  -11.05d {-11d 03' 06"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.04d {+10h 44m 09s}  +11.72d {+11d 43' 28"}
MOON_DIST:       114.86 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:15:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.131d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
ROLL:            3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11073.39 SOD {03:04:33.39} UT,   298.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     572324695
X_OFFSET:        1045 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1205
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0321.fits
SUN_POSTN:       333.22d {+22h 12m 53s}  -11.05d {-11d 03' 05"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.05d {+10h 44m 11s}  +11.72d {+11d 43' 17"}
MOON_DIST:       114.86 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [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:     Wed 20 Feb 19 03:15:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.131d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
ROLL:            3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11073.39 SOD {03:04:33.39} UT,   298.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     572324695
X_OFFSET:        1045 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1205
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0321.fits
SUN_POSTN:       333.22d {+22h 12m 53s}  -11.05d {-11d 03' 05"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.05d {+10h 44m 12s}  +11.72d {+11d 43' 14"}
MOON_DIST:       114.86 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [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:     Wed 20 Feb 19 03:14:51 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     889785,   Seg_Num: 0
GRB_RA:          330.1598d {+22h 00m 38.35s} (J2000),
                 330.6265d {+22h 02m 30.36s} (current),
                 328.9176d {+21h 55m 40.22s} (1950)
GRB_DEC:         -76.6816d {-76d 40' 53.7"} (J2000),
                 -76.5890d {-76d 35' 20.2"} (current),
                 -76.9216d {-76d 55' 17.7"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  10930.00 SOD {03:02:10.00} UT,   155.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       333.22d {+22h 12m 53s}  -11.05d {-11d 03' 05"}
SUN_DIST:         65.55 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.04d {+10h 44m 11s}  +11.72d {+11d 43' 20"}
MOON_DIST:       114.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.13,-36.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      292.09,-57.91 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #23908
K. L. Page (U Leicester), N. J. Klingler (PSU), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 02:59:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190220A (trigger=889785). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 330.142, -76.691 which is
```
   RA(J2000) = 22h 00m 34s
   Dec(J2000) = -76d 41' 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 10 sec. The peak count rate was ~1700 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 03:00:55.5 UT, 80.8 seconds after the BAT trigger. The position determined from promptly downlinked data differs significantly from the on-board position, suggesting that the XRT may have centroided on a cosmic ray; the initial XRT position notice should be treated with caution. Using promptly downlinked data we find an uncatalogued, fading X-ray source located at RA, Dec 330.16325, -76.68047 which is equivalent to:
```
   RA(J2000)  = 22h 00m 39.18s
   Dec(J2000) = -76d 40' 49.7"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 41 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.10 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 4.9 (+3.65/-3.07) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 86 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	22:00:39.14 = 330.16309
  DEC(J2000) = -76:40:50.4  = -76.68067
```
with a 90%-confidence error radius of about 0.66 arc sec. This position is 3.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.29 with a 1-sigma error of about 0.16. No correction has been made for the expected extinction corresponding to E(B-V) of 0.13.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk). 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:     Wed 20 Feb 19 03:19:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.132d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
POINT_ROLL:      3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11651.36 SOD {03:14:11.36} UT,   876.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.413
N_STARS:         86
X_OFFSET:        485 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1924 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00889785000msufc0876.fits
SUN_POSTN:       333.22d {+22h 12m 54s}  -11.05d {-11d 03' 01"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.10d {+10h 44m 23s}  +11.71d {+11d 42' 18"}
MOON_DIST:       114.84 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:20:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.132d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
POINT_ROLL:      3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11651.36 SOD {03:14:11.36} UT,   876.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.413
N_STARS:         86
X_OFFSET:        485 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1924 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00889785000msufc0876.fits
SUN_POSTN:       333.22d {+22h 12m 54s}  -11.05d {-11d 03' 00"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.10d {+10h 44m 24s}  +11.70d {+11d 42' 16"}
MOON_DIST:       114.84 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:21:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.132d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
ROLL:            3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11651.36 SOD {03:14:11.36} UT,   876.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     572325273
X_OFFSET:        1044 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1204
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0899.fits
SUN_POSTN:       333.22d {+22h 12m 54s}  -11.05d {-11d 03' 00"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.11d {+10h 44m 27s}  +11.70d {+11d 42' 02"}
MOON_DIST:       114.84 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Feb 19 03:21:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     889785,   Seg_Num: 0
POINT_RA:        330.132d {+22h 00m 32s} (J2000)
POINT_DEC:       -76.716d {-76d 42' 55"} (J2000)
ROLL:            3.310d
IMG_START_DATE:  18534 TJD;    51 DOY;   19/02/20
IMG_START_TIME:  11651.36 SOD {03:14:11.36} UT,   876.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     572325273
X_OFFSET:        1044 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1204
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00889785000msuni0899.fits
SUN_POSTN:       333.22d {+22h 12m 54s}  -11.05d {-11d 03' 00"}
SUN_DIST:         65.59 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      161.11d {+10h 44m 27s}  +11.70d {+11d 41' 60"}
MOON_DIST:       114.84 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      314.11,-36.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      292.04,-57.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #23912
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 749 s of XRT Photon Counting mode data and 2 UVOT images for GRB 190220A, 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 = 330.16376, -76.68124 which is equivalent to:
```
RA (J2000): 22h 00m 39.30s
Dec (J2000): -76d 40' 52.5"
```
with an uncertainty of 1.5 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 #23914
S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), K. L. Page (U Leicester), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190220A (trigger #889785) (Page et al., GCN Circ. 23908). The BAT ground-calculated position is RA, Dec = 330.128, -76.669 deg which is
```
  RA(J2000)  =  22h 00m 30.7s
  Dec(J2000) = -76d 40' 10.1"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The mask-weighted light curve shows a single-pulse structure that starts at ~T0, peaks at ~T+2 s, and ends at ~T+12 s. T90 (15-350 keV) is 10.0 +- 2.0 sec (estimated error including systematics).
The time-averaged spectrum from T-0.12 to T+11.88 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.79 +- 0.77, and Epeak of 40.3 +- 6.7 keV (chi squared 60.03 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 8.9 +- 1.0 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+1.88 sec in the 15-150 keV band is 2.6 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.03 +- 0.13 (chi squared 70.39 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/889785/BA/
GCN Circular #23917
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), S. J. LaPorte (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and K.L. Page report on behalf of the Swift-XRT team:
We have analysed 6.9 ks of XRT data for GRB 190220A (Page et al. GCN Circ. 23908), from 68 s to 80.7 ks after the BAT trigger. The data comprise 67 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 Evans et al. (GCN Circ. 23912).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.4 (+0.3, -0.4), followed by a break at T+173 s to an alpha of 1.10 (+/-0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.69 (+0.25, -0.23). The best-fitting absorption column is 3.9 (+1.5, -1.2) x 10^21 cm^-2, in excess of the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (6.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.9 (+1.5, -1.2) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^21 cm^-2
Excess significance: 3.7 sigma
Photon index:	     1.69 (+0.25, -0.23)
```
If the light curve continues to decay with a power-law decay index of 1.10, the count rate at T+24 hours will be 1.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.1 x 10^-14 (1.2 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/00889785.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 21-Feb-2019 [Disclaimer]