Gamma-ray Burst 200131A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:41:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.095d {+00h 12m 23s} (J2000),
                   3.361d {+00h 13m 27s} (current),
                   2.438d {+00h 09m 45s} (1950)
GRB_DEC:         +51.124d {+51d 07' 25"} (J2000),
                 +51.235d {+51d 14' 07"} (current),
                 +50.846d {+50d 50' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       30074 [cnts]    Image_Peak=6041 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       19933 [cnts]
BKG_TIME:        81663.64 SOD {22:41:03.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18879 TJD;    31 DOY;   20/01/31
GRB_TIME:        81675.99 SOD {22:41:15.99} UT
GRB_PHI:         -16.42 [deg]
GRB_THETA:        23.15 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     255.99 [sigma]
IMAGE_SIGNIF:    25.71 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +9  +0  +0 -16  +0 
SUN_POSTN:       313.98d {+20h 55m 55s}  -17.32d {-17d 19' 29"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.79d {+01h 55m 10s}   +6.62d {+06d 36' 59"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.53, 44.49 [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 = 310.10,9.30 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:42:52 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.0942d {+00h 12m 22.60s} (J2000),
                   3.3593d {+00h 13m 26.24s} (current),
                   2.4371d {+00h 09m 44.90s} (1950)
GRB_DEC:         +51.1158d {+51d 06' 56.8"} (J2000),
                 +51.2274d {+51d 13' 38.7"} (current),
                 +50.8377d {+50d 50' 15.7"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.76e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.63 [sigma]
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81744.73 SOD {22:42:24.73} UT,   68.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.21 261.63 243.50
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       313.98d {+20h 55m 55s}  -17.32d {-17d 19' 28"}
SUN_DIST:         80.96 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.80d {+01h 55m 12s}   +6.62d {+06d 37' 13"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.53, 44.48 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.47 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:43:03 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.0942d {+00h 12m 22.6s} (J2000),
                   3.3593d {+00h 13m 26.2s} (current),
                   2.4371d {+00h 09m 44.9s} (1950)
GRB_DEC:         +51.1158d {+51d 06' 56.8"} (J2000),
                 +51.2274d {+51d 13' 38.7"} (current),
                 +50.8377d {+50d 50' 15.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       113 [cnts]
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81744.73 SOD {22:42:24.73} UT,   68.7 [sec] since BAT Trigger Time
CENTROID_X:      290.47,  raw= 290  [pixels]
CENTROID_Y:      300.63,  raw= 301  [pixels]
ROLL:            227.00 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.97
GRB_POS_XRT_Z:   -39.90
IMAGE_URL:       sw00953689000msxps_rw.img
SUN_POSTN:       313.98d {+20h 55m 55s}  -17.32d {-17d 19' 28"}
SUN_DIST:         80.96 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.80d {+01h 55m 13s}   +6.62d {+06d 37' 15"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.53, 44.48 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:43:06 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.0942d {+00h 12m 22.6s} (J2000),
                   3.3593d {+00h 13m 26.2s} (current),
                   2.4371d {+00h 09m 44.9s} (1950)
GRB_DEC:         +51.1158d {+51d 06' 56.8"} (J2000),
                 +51.2274d {+51d 13' 38.7"} (current),
                 +50.8377d {+50d 50' 15.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       113 [cnts]
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81744.73 SOD {22:42:24.73} UT,   68.7 [sec] since BAT Trigger Time
CENTROID_X:      290.47,  raw= 290  [pixels]
CENTROID_Y:      300.63,  raw= 301  [pixels]
ROLL:            227.00 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.97
GRB_POS_XRT_Z:   -39.90
IMAGE_URL:       sw00953689000msxps_rw.img
SUN_POSTN:       313.98d {+20h 55m 55s}  -17.32d {-17d 19' 28"}
SUN_DIST:         80.96 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.80d {+01h 55m 13s}   +6.62d {+06d 37' 16"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.53, 44.48 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:45:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.104d {+00h 12m 25s} (J2000)
POINT_DEC:       +51.125d {+51d 07' 29"} (J2000)
POINT_ROLL:      227.001d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81753.47 SOD {22:42:33.47} UT,   77.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.530
N_STARS:         190
X_OFFSET:        536 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1495 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00953689000msufc0077.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 26"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.82d {+01h 55m 17s}   +6.63d {+06d 37' 43"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:45:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.104d {+00h 12m 25s} (J2000)
POINT_DEC:       +51.125d {+51d 07' 29"} (J2000)
POINT_ROLL:      227.001d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81753.47 SOD {22:42:33.47} UT,   77.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.530
N_STARS:         190
X_OFFSET:        536 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1495 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00953689000msufc0077.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 26"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.82d {+01h 55m 18s}   +6.63d {+06d 37' 46"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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:     Fri 31 Jan 20 22:47:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.104d {+00h 12m 25s} (J2000)
POINT_DEC:       +51.125d {+51d 07' 29"} (J2000)
ROLL:            227.001d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81753.47 SOD {22:42:33.47} UT,   77.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602203377
X_OFFSET:        868 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1028
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00953689000msuni0102.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 25"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.83d {+01h 55m 20s}   +6.63d {+06d 38' 00"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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:     Fri 31 Jan 20 22:47:11 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.095d {+00h 12m 23s} (J2000),
                   3.361d {+00h 13m 27s} (current),
                   2.438d {+00h 09m 45s} (1950)
GRB_DEC:         +51.124d {+51d 07' 25"} (J2000),
                 +51.235d {+51d 14' 07"} (current),
                 +50.846d {+50d 50' 44"} (1950)
GRB_DATE:        18879 TJD;    31 DOY;   20/01/31
GRB_TIME:        81675.99 SOD {22:41:15.99} UT
TRIGGER_INDEX:   146
GRB_PHI:         -16.42 [deg]
GRB_THETA:        23.15 [deg]
DELTA_TIME:      44.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     255.99 [sigma]
IMAGE_SIGNIF:    25.71 [sigma]
LC_URL:          sw00953689000msb.lc
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 25"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.83d {+01h 55m 20s}   +6.63d {+06d 38' 02"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.53, 44.49 [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 = 310.10,9.30 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:47:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.104d {+00h 12m 25s} (J2000)
POINT_DEC:       +51.125d {+51d 07' 29"} (J2000)
ROLL:            227.001d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81753.47 SOD {22:42:33.47} UT,   77.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602203377
X_OFFSET:        868 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1028
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00953689000msuni0102.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 25"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.84d {+01h 55m 20s}   +6.63d {+06d 38' 03"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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:     Fri 31 Jan 20 22:48:23 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     953689,   Seg_Num: 0
GRB_RA:            3.0940d {+00h 12m 22.55s} (J2000),
                   3.3591d {+00h 13m 26.19s} (current),
                   2.4369d {+00h 09m 44.85s} (1950)
GRB_DEC:         +51.1167d {+51d 07' 00.1"} (J2000),
                 +51.2283d {+51d 13' 41.9"} (current),
                 +50.8386d {+50d 50' 19.0"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         15.43 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81750.00 SOD {22:42:30.00} UT,   74.0 [sec] since BAT Trigger Time
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 24"}
SUN_DIST:         80.96 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.84d {+01h 55m 22s}   +6.64d {+06d 38' 16"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.70,-11.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.53, 44.48 [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 3.2 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:48:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.107d {+00h 12m 26s} (J2000)
POINT_DEC:       +51.124d {+51d 07' 26"} (J2000)
POINT_ROLL:      227.003d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81965.87 SOD {22:46:05.87} UT,   289.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.120
N_STARS:         78
X_OFFSET:        548 [pixels]
Y_OFFSET:        514 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1473 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw00953689000msufc0289.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 24"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.84d {+01h 55m 23s}   +6.64d {+06d 38' 16"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 31 Jan 20 22:48:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.107d {+00h 12m 26s} (J2000)
POINT_DEC:       +51.124d {+51d 07' 26"} (J2000)
POINT_ROLL:      227.003d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81965.87 SOD {22:46:05.87} UT,   289.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.120
N_STARS:         78
X_OFFSET:        548 [pixels]
Y_OFFSET:        514 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1473 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw00953689000msufc0289.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 24"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.85d {+01h 55m 23s}   +6.64d {+06d 38' 20"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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:     Fri 31 Jan 20 22:50:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.107d {+00h 12m 26s} (J2000)
POINT_DEC:       +51.124d {+51d 07' 26"} (J2000)
ROLL:            227.003d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81965.87 SOD {22:46:05.87} UT,   289.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     602203590
X_OFFSET:        868 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1028
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00953689000msuni0314.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 23"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.86d {+01h 55m 26s}   +6.64d {+06d 38' 35"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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:     Fri 31 Jan 20 22:50:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     953689,   Seg_Num: 0
POINT_RA:          3.107d {+00h 12m 26s} (J2000)
POINT_DEC:       +51.124d {+51d 07' 26"} (J2000)
ROLL:            227.003d
IMG_START_DATE:  18879 TJD;    31 DOY;   20/01/31
IMG_START_TIME:  81965.87 SOD {22:46:05.87} UT,   289.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     602203590
X_OFFSET:        868 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1028
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00953689000msuni0314.fits
SUN_POSTN:       313.98d {+20h 55m 56s}  -17.32d {-17d 19' 23"}
SUN_DIST:         80.97 [deg]   Sun_angle= -3.3 [hr] (East of Sun)
MOON_POSTN:       28.86d {+01h 55m 26s}   +6.64d {+06d 38' 37"}
MOON_DIST:        49.34 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      116.71,-11.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.54, 44.49 [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 Circular #26952
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB200131.95 (trigger No 953689,00h 12m 22.80s , +51d 07m 26.4s, R=0.05) errorbox 50 sec after trigger time at 2020-01-31 22:42:06 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 75 deg. The sun altitude is -19.4 deg.
MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the Swift GRB200131.95 errorbox 12 sec after notice time and 78 sec after trigger time at 2020-01-31 22:42:34 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 70 deg. The sun altitude is -53.2 deg.
The galactic latitude b = -11 deg., longitude l = 117 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1273952
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      55 |        MASTER-Tunka |  P| |    10 | 14.5 |        
      83 |          MASTER-IAC |  P- |    10 | 16.1 |        
      84 |          MASTER-IAC |  P| |    10 | 16.4 |        
     128 |          MASTER-IAC |  P- |    20 | 16.4 |        
     128 |          MASTER-IAC |  P| |    20 | 16.6 |        
     182 |          MASTER-IAC |  P- |    30 | 16.5 |        
     182 |          MASTER-IAC |  P| |    30 | 16.8 |        
     325 |        MASTER-Tunka |  P| |    60 | 16.6 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #26953
B. Sbarufatti (PSU), D. N. Burrows (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 22:41:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200131A (trigger=953689). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 3.095, +51.124 which is
```
   RA(J2000) = 00h 12m 23s
   Dec(J2000) = +51d 07' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 5 sec. There might be a small pulse at T+30 s. The peak count rate was ~60000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 22:42:24.7 UT, 68.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 3.0942, 51.1158 which is equivalent to:
```
   RA(J2000)  = 00h 12m 22.61s
   Dec(J2000) = +51d 06' 56.9"
```
with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 29 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 3.76e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	00:12:22.57 =	3.09403
  DEC(J2000) = +51:07:00.4  =  51.11678
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 3.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.44 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is B. Sbarufatti (bxs60 AT psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #26954
V. Lipunov, N.Tyurina, E. Gorbovskoy, O.Gress, V.Kornilov, P.Balanutsa,A.Kuznetsov, V. Vladimirov, D. Vlasenko, F.Balakin, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D. Kuvshinov, V.Shumkov (Lomonosov Moscow State University, SAI, Physics Department), D. Buckley(South African Astronomical Observatory), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), 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), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University)
MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,v. 2010, 30L) started Swift GRB 200131A (Sbarufatti et al. GCN 26953) alert observation 50s after trigger time (Lipunov et al. GCN 26952) at MASTER-Tunka and 78s after trigger time at MASTER-IAC.
MASTER auto-detection system found MASTER OT J001222.56+510700.3 at
RA,Dec(2000) = 00h 12m 22.56s , +51d 07m 00s.3
with m_OT=14.5 (unfiltered) at the first exposition (10s) with optical decay, also detected by Swift UVOT (GCN 26953)
Observation and reduction will be continued
GCN Circular #26956
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 2283 s of XRT Photon Counting mode data and 6 UVOT images for GRB 200131A, 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 = 3.09439, +51.11676 which is equivalent to:
```
RA (J2000): 00h 12m 22.65s
Dec (J2000): +51d 07' 00.4"
```
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 #26957
Nat Butler (ASU), Alan M. Watson (UNAM), 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 200131A (Sbarufatti et al., GCN 26953) 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 1.10 to 2020/02 1.14 UTC (3.79 to 4.61 hours after the BAT trigger), obtaining a total of 0.64 hours exposure in the r and i bands.
The optical transient (see, also, Lipunov et al., GCN 26954) is well-detected. We find:
```
  r = 19.97 +/- 0.04
  i = 19.75 +/- 0.02
```
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.
GCN Circular #26958
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 200131A (Sbarufatti et al., GCN 26953) starting at 4.15 hours after the burst. Observations were performed in the clear (roughly R) filters, a total of 11 images were obtained and the exposure time was 60 s per image. We do not detect the optical afterglow reported by UVOT (Sbarufatti et al., GCN 26953; see also Lipunov et al. GCN 26954; Butler et al. GCN 26957), neither in single image nor in the co-add image. The limiting magnitude estimated from our coadd image is about 19.5 mag.
GCN Circular #26959
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Swift GRB 200131A (Kennea et al., GCN 26953) with the LCO 1-m Sinistro instrument at the McDonald Observatory, Texas, USA site on January 31, from 01:59 to 02:22 UT (corresponding to 3.1 to 3.6 hours after the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x120s exposures in each band. We detect a source in the Swift-BAT refined error region (Evans et al., GCN 26956) that is not present in either USNO-B1.0 or 2MASS surveys with the following magnitudes:
R = 19.75 +/- 0.13
I = 19.31 +/- 0.14
This flux measurement is calibrated against several USNO-B1.0 objects near the GRB location and is not corrected for Galactic Extinction.
GCN Circular #26960
P. Gokuldass (UVI), D. Morris (UVI), N. Orange (OrangeWave Innovative Science, LLC), A. Cucchiara (College of Marin), R. Strausbaugh (UVI) report:
We observed the field of GRB 200131A (Sbarufatti et al. GCN 26953) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 01-31-2020 starting at 23:28:45 UT (T+67 minutes). We performed a series of exposures in R filter. The weather conditions were variable during the hours of observation and the zenith angle at the start of observations was 54 degrees and setting. The midpoint of the exposures is ~T+1.6 hrs. We observed the Swift XRT position with a 20'x20' field of view
We detect an uncatalogued source consistent with the UVOT position (Sbarufatti et al. GCN 26953) and MASTER OT position (Lipunov et al. 26954) with magnitude:
R= 16.8 +/- 0.2
The magnitude is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase.
This work is supported by NASA-MUREP-MIRO grant NNX15AP95A, NSF EiR AST Award 1901296, and NSF HBCU-UP AST Award 1831682. This message can be cited.
GCN Circular #26961
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU) and B. Sbarufatti report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 200131A (Sbarufatti et al. GCN Circ. 26953), from 61 s to 17.4 ks after the BAT trigger. The data comprise 249 s in Windowed Timing (WT) mode (the first 5 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. 26956). We cannot determine at the present time whether the source is fading.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.83 (+0.04, -0.03). The best-fitting absorption column is consistent with the Galactic value of 1.8 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.81 (+0.15, -0.14) and a best-fitting absorption column of 2.3 (+0.6, -0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.3 (+0.6, -0.4) x 10^21 cm^-2
Galactic foreground: 1.8 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.81 (+0.15, -0.14)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00953689.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 01-Feb-2020 [Disclaimer]