Gamma-ray Burst 200324A

(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 24 Mar 20 16:39:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     963260,   Seg_Num: 0
GRB_RA:          222.685d {+14h 50m 44s} (J2000),
                 222.889d {+14h 51m 33s} (current),
                 222.182d {+14h 48m 44s} (1950)
GRB_DEC:         +35.968d {+35d 58' 06"} (J2000),
                 +35.886d {+35d 53' 09"} (current),
                 +36.174d {+36d 10' 26"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10976 [cnts]    Image_Peak=394 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       89353 [cnts]
BKG_TIME:        59887.34 SOD {16:38:07.34} UT
BKG_DUR:         40 [sec]
GRB_DATE:        18932 TJD;    84 DOY;   20/03/24
GRB_TIME:        59947.95 SOD {16:39:07.95} UT
GRB_PHI:           8.83 [deg]
GRB_THETA:        18.69 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.84 [sigma]
IMAGE_SIGNIF:    9.81 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +0  +0  +0 +61  +0 
SUN_POSTN:         4.13d {+00h 16m 32s}   +1.79d {+01d 47' 23"}
SUN_DIST:        127.82 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.01d {+00h 36m 02s}   -1.50d {-01d 29' 53"}
MOON_DIST:       133.45 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.64, 63.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      204.39, 49.21 [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 = 153.14,-11.25 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:42:37 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     963260,   Seg_Num: 0
GRB_RA:          222.6715d {+14h 50m 41.16s} (J2000),
                 222.8753d {+14h 51m 30.07s} (current),
                 222.1676d {+14h 48m 40.23s} (1950)
GRB_DEC:         +35.9414d {+35d 56' 29.0"} (J2000),
                 +35.8587d {+35d 51' 31.4"} (current),
                 +36.1469d {+36d 08' 48.9"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.27e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.68 [sigma]
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60131.83 SOD {16:42:11.83} UT,   183.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.13 261.69 243.59
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 26"}
SUN_DIST:        127.85 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.03d {+00h 36m 07s}   -1.49d {-01d 29' 20"}
MOON_DIST:       133.48 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.59, 63.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      204.40, 49.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.75 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:43:02 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     963260,   Seg_Num: 0
GRB_RA:          222.6715d {+14h 50m 41.1s} (J2000),
                 222.8753d {+14h 51m 30.0s} (current),
                 222.1676d {+14h 48m 40.2s} (1950)
GRB_DEC:         +35.9414d {+35d 56' 29.0"} (J2000),
                 +35.8587d {+35d 51' 31.4"} (current),
                 +36.1469d {+36d 08' 48.9"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       59 [cnts]
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60131.83 SOD {16:42:11.83} UT,   183.9 [sec] since BAT Trigger Time
CENTROID_X:      386.14,  raw= 386  [pixels]
CENTROID_Y:      255.13,  raw= 255  [pixels]
ROLL:            52.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -101.28
GRB_POS_XRT_Z:   185.62
IMAGE_URL:       sw00963260000msxps_rw.img
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 26"}
SUN_DIST:        127.85 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.03d {+00h 36m 08s}   -1.49d {-01d 29' 15"}
MOON_DIST:       133.48 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.59, 63.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      204.40, 49.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:42:53 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     963260,   Seg_Num: 0
GRB_RA:          222.6715d {+14h 50m 41.1s} (J2000),
                 222.8753d {+14h 51m 30.0s} (current),
                 222.1676d {+14h 48m 40.2s} (1950)
GRB_DEC:         +35.9414d {+35d 56' 29.0"} (J2000),
                 +35.8587d {+35d 51' 31.4"} (current),
                 +36.1469d {+36d 08' 48.9"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       59 [cnts]
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60131.83 SOD {16:42:11.83} UT,   183.9 [sec] since BAT Trigger Time
CENTROID_X:      386.14,  raw= 386  [pixels]
CENTROID_Y:      255.13,  raw= 255  [pixels]
ROLL:            52.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -101.28
GRB_POS_XRT_Z:   185.62
IMAGE_URL:       sw00963260000msxps_rw.img
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 26"}
SUN_DIST:        127.85 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.03d {+00h 36m 07s}   -1.49d {-01d 29' 17"}
MOON_DIST:       133.48 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.59, 63.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      204.40, 49.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:45:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.700d {+14h 50m 48s} (J2000)
POINT_DEC:       +35.995d {+35d 59' 42"} (J2000)
POINT_ROLL:      52.156d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60142.46 SOD {16:42:22.46} UT,   194.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.453
N_STARS:         111
X_OFFSET:        236 [pixels]
Y_OFFSET:        923 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00963260000msufc0194.fits
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 29"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.05d {+00h 36m 12s}   -1.48d {-01d 28' 45"}
MOON_DIST:       133.43 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:47:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.700d {+14h 50m 48s} (J2000)
POINT_DEC:       +35.995d {+35d 59' 42"} (J2000)
ROLL:            52.156d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60142.46 SOD {16:42:22.46} UT,   194.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     606760967
X_OFFSET:        556 [pixels]
Y_OFFSET:        1243 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       716
Y_GRB_POS:       1403
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0219.fits
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 30"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.07d {+00h 36m 16s}   -1.47d {-01d 28' 23"}
MOON_DIST:       133.44 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:43:11 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     963260,   Seg_Num: 0
GRB_RA:          222.685d {+14h 50m 44s} (J2000),
                 222.889d {+14h 51m 33s} (current),
                 222.182d {+14h 48m 44s} (1950)
GRB_DEC:         +35.968d {+35d 58' 06"} (J2000),
                 +35.886d {+35d 53' 09"} (current),
                 +36.174d {+36d 10' 26"} (1950)
GRB_DATE:        18932 TJD;    84 DOY;   20/03/24
GRB_TIME:        59947.95 SOD {16:39:07.95} UT
TRIGGER_INDEX:   298
GRB_PHI:           8.83 [deg]
GRB_THETA:        18.69 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.84 [sigma]
IMAGE_SIGNIF:    9.81 [sigma]
LC_URL:          sw00963260000msb.lc
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 26"}
SUN_DIST:        127.82 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.03d {+00h 36m 08s}   -1.49d {-01d 29' 13"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.64, 63.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      204.39, 49.21 [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 = 153.14,-11.25 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:50:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
POINT_ROLL:      52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60301.33 SOD {16:45:01.33} UT,   353.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.363
N_STARS:         33
X_OFFSET:        236 [pixels]
Y_OFFSET:        923 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00963260000msufc0353.fits
SUN_POSTN:         4.14d {+00h 16m 34s}   +1.79d {+01d 47' 34"}
SUN_DIST:        127.79 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.09d {+00h 36m 22s}   -1.46d {-01d 27' 44"}
MOON_DIST:       133.44 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:45:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.700d {+14h 50m 48s} (J2000)
POINT_DEC:       +35.995d {+35d 59' 42"} (J2000)
POINT_ROLL:      52.156d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60142.46 SOD {16:42:22.46} UT,   194.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.453
N_STARS:         111
X_OFFSET:        236 [pixels]
Y_OFFSET:        923 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00963260000msufc0194.fits
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 28"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.05d {+00h 36m 12s}   -1.48d {-01d 28' 47"}
MOON_DIST:       133.43 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:47:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.700d {+14h 50m 48s} (J2000)
POINT_DEC:       +35.995d {+35d 59' 42"} (J2000)
ROLL:            52.156d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60142.46 SOD {16:42:22.46} UT,   194.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     606760967
X_OFFSET:        556 [pixels]
Y_OFFSET:        1243 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       716
Y_GRB_POS:       1403
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0219.fits
SUN_POSTN:         4.14d {+00h 16m 33s}   +1.79d {+01d 47' 31"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.07d {+00h 36m 16s}   -1.47d {-01d 28' 22"}
MOON_DIST:       133.44 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the 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 24 Mar 20 16:52:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
ROLL:            52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60301.33 SOD {16:45:01.33} UT,   353.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     606761125
X_OFFSET:        556 [pixels]
Y_OFFSET:        1243 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       716
Y_GRB_POS:       1403
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0378.fits
SUN_POSTN:         4.14d {+00h 16m 34s}   +1.79d {+01d 47' 35"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.10d {+00h 36m 24s}   -1.46d {-01d 27' 27"}
MOON_DIST:       133.45 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the 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 24 Mar 20 16:50:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
POINT_ROLL:      52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60301.33 SOD {16:45:01.33} UT,   353.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.363
N_STARS:         33
X_OFFSET:        236 [pixels]
Y_OFFSET:        923 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00963260000msufc0353.fits
SUN_POSTN:         4.14d {+00h 16m 34s}   +1.79d {+01d 47' 34"}
SUN_DIST:        127.79 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.09d {+00h 36m 22s}   -1.46d {-01d 27' 42"}
MOON_DIST:       133.44 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:51:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
ROLL:            52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60301.33 SOD {16:45:01.33} UT,   353.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     606761125
X_OFFSET:        556 [pixels]
Y_OFFSET:        1243 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       716
Y_GRB_POS:       1403
BINNING_INDEX:   1
IM_URL:          sw00963260000msuni0378.fits
SUN_POSTN:         4.14d {+00h 16m 34s}   +1.79d {+01d 47' 35"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.10d {+00h 36m 24s}   -1.46d {-01d 27' 30"}
MOON_DIST:       133.45 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:56:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
POINT_ROLL:      52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60807.91 SOD {16:53:27.91} UT,   860.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.849
N_STARS:         161
X_OFFSET:        0 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00963260000msufc0859.fits
SUN_POSTN:         4.15d {+00h 16m 35s}   +1.79d {+01d 47' 40"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.14d {+00h 36m 33s}   -1.44d {-01d 26' 31"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Mar 20 16:57:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     963260,   Seg_Num: 0
POINT_RA:        222.702d {+14h 50m 49s} (J2000)
POINT_DEC:       +35.997d {+35d 59' 49"} (J2000)
POINT_ROLL:      52.157d
IMG_START_DATE:  18932 TJD;    84 DOY;   20/03/24
IMG_START_TIME:  60807.91 SOD {16:53:27.91} UT,   860.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.849
N_STARS:         161
X_OFFSET:        0 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00963260000msufc0859.fits
SUN_POSTN:         4.15d {+00h 16m 35s}   +1.79d {+01d 47' 40"}
SUN_DIST:        127.80 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:        9.14d {+00h 36m 34s}   -1.44d {-01d 26' 25"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       59.70, 63.20 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      204.39, 49.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #27427
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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB200324.69 (trigger No 963260,14h 50m 44.40s , +35d 58m 04.8s, R=0.05) errorbox 16 sec after notice time and 58 sec after trigger time at 2020-03-24 16:40:06 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 22 deg. The sun altitude is -36.6 deg.
The galactic latitude b = 63 deg., longitude l = 59 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1320927
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      64 |         MASTER-Amur |  P/ |    10 | 15.8 |        
      91 |         MASTER-Amur |  P/ |    20 | 15.9 |        
     126 |         MASTER-Amur |  P/ |    20 | 15.9 |        
     163 |         MASTER-Amur |  P/ |    30 | 16.1 |        
     225 |         MASTER-Amur |  P/ |    40 | 16.3 |        
     282 |         MASTER-Amur |  P/ |    50 | 16.3 |        
     350 |         MASTER-Amur |  P/ |    60 | 16.3 |        
     429 |         MASTER-Amur |  P/ |    60 | 16.3 |        
     509 |         MASTER-Amur |  P/ |    60 | 16.2 |        
     657 |         MASTER-Amur |  P/ |    60 | 16.3 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #27428
S. Dichiara (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sbarrato (INAF-OAB), B. Sbarufatti (PSU) and T. N. Ukwatta (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 16:39:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200324A (trigger=963260). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 222.685, +35.968 which is
```
   RA(J2000) = 14h 50m 44s
   Dec(J2000) = +35d 58' 06"
```
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 60 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 16:42:11.8 UT, 183.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 222.67198, 35.94100 which is equivalent to:
```
   RA(J2000)  = 14h 50m 41.28s
   Dec(J2000) = +35d 56' 27.6"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 104 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.07 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.9 (+2.21/-1.93) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.27e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 194 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 0.01.
This source lies within the current (Sector 23) field-of-view of TESS camera 2.
Burst Advocate for this burst is S. Dichiara (dichiara AT umd.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 #27429
R. Hosokawa,R. Adachi, K. L. Murata, M. Oeda, K. Shiraishi, K. Iida, M. Niwano, F. Ogawa, S. Toma, N. Nakamura, Y. Yatsu, and N. Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 200324A (S. Dichiara et al., GCN Circular #27428) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 16:42:46 UT. We did not find any new point sources within the Swift XRT circle (S. Dichiara et al., GCN Circular #27428) in all three bands. We obtained the 5-sigma limits as follows.
```
T0+[sec] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
219 16:46:39 420 g'>18.9,Rc>18.6,Ic>17.6
------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used UCAC4 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. ,in prep; https://github.com/MNiwano/Eclair)
GCN Circular #27430
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1203 s of XRT Photon Counting mode data and 2 UVOT images for GRB 200324A, 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 = 222.67373, +35.94173 which is equivalent to:
```
RA (J2000): 14h 50m 41.70s
Dec (J2000): +35d 56' 30.2"
```
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 #27431
B. Stecklum, S. Klose, A. Nicuesa Guelbenzu, S. Melnikov, and F. Ludwig (all Tautenburg) report:
We observed the field of GRB 200324A (Dichiara et al., GCN 27428) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD camera and the wide V-band filter (VB). The transmission curve of this filter closely follows the Gaia GBP filter. Observations started at 20:08:15 UT and consisted of 5x5 min exposures.
Inside the enhanced XRT error circle (Beardmore et al., GCN 27430) we do not find any optical transient. Based on Gaia DR2 stars in the field, we provide an upper limit of VB > 22.0 mag (Vega system; 3.5 hr after the burst). We note that only ~5 arcsec north of the center of the XRT error circle lies the faint SDSS-DR8 source J145041.56+355635.6, possibly the GRB host galaxy.
GCN Circular #27432
Johan P. U. Fynbo (DAWN/NBI), Daniele B. Malesani (DTU Space), Abel de Burgos Sierra (NOT), Thomas Augusteijn (NOT), report on behalf of a larger collaboration:
On 2020 March 24.97 UT (6 hr 39 min after the trigger) we observed the field of GRB 200324A (Dichiara et al., GCN 27428; Beardmore et al., GCN 27430) with the Nordic Optical Telescope equipped with ALFOSC in the SDSS r filter, for a total integration time of 300 s. We find no evidence for afterglow emission above a 3-sigma limit of about 23 mag. Our result is consistent with the non-detection by Stecklum et al. (GCN 27431).
GCN Circular #27433
J. Vinko (Konkoly/ELTE/U Szeged), A. Ordasi (Konkoly), L. Kriskovics (Konkoly), R. Szakats (Konkoly) and A. Pal (Konkoly) report on behalf of the "Transient Astrophyical Objects" project:
We observed the field of GRB 200324A (Dichiara et al. GCN 27428; Beardmore et al., GCN 27430; Stecklum et al. GCN 27431; Fynbo et al. GCN 27432) with the 0.8m RC80 robotic telescope at Piszkesteto Mountain Station of Konkoly Observatory through SDSS r' filter on 2020 March 24.88 UT (MJD 58932.885, 4h 36m after the trigger). The total exposure time was 1800 s. The frames were tied to PS1-photometry of local stellar sources. No optical counterpart for the GRB has been detected above the 3-sigma upper limit of 21.7 AB-mag, which is consistent with other reports of non-detection.
GCN Circular #27435
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB) and S. Dichiara report on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 200324A (Dichiara et al. GCN Circ. 27428), from 190 s to 35.9 ks after the BAT trigger. The data comprise 163 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 27430).
The light curve can be modelled with an initial power-law decay with an index of alpha=3.61 (+0.29, -0.25), followed by a break at T+434 s to an alpha of 1.03 (+/-0.07).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.48 (+0.13, -0.11). The best-fitting absorption column is 1.49 (+0.28, -0.26) x 10^21 cm^-2, in excess of the Galactic value of 1.1 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.92 (+0.18, -0.17) and a best-fitting absorption column of 2.7 (+/-0.7) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.7 (+/-0.7) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^20 cm^-2
Excess significance: 6.3 sigma
Photon index:	     1.92 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 1.03, the count rate at T+24 hours will be 8.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.1 x 10^-13 (4.4 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/00963260.
This circular is an official product of the Swift-XRT team.
GCN Circular #27436
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 200324A (Dichiara et al., GCN 27428) with the LCO 1-m Sinistro instrument at the McDonald Observatory, USA site, on March 25, from 6:06 to 6:46 UT (corresponding to 13.28 to 13.95 hours from the GRB trigger time) with the Bessel I and R filters.
We performed a series of 5x240s exposures in I and R. We do not detect any sources in the individual frames (nor in stacked images) in the Swift enhanced error region (Beardmore et al., GCN 27430), consistent with other optical non-detections. Using the USNO-B.1 catalog as reference, we obtain the following 3-sigma upper limits:
R > 24.21
I > 22.56
R.S. is funded by NSF AST grant #1831682
GCN Circular #27439
A. A. Breeveld (UCL-MSSL) and S. Dichiara (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200324A 215 s after the BAT trigger (Dichiara et al., GCN Circ. 27428). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 27430) 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           215          365          147         >21.0
u_FC               374          624          246         >20.6
white              215         1376          373         >21.7
v                  704         1427           78         >18.9
b                  630         1527           97         >19.8
u                  374         1327          304         >20.2
w1                 754         1477           78         >19.1
w2                1381         1401           19         >19.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27440
S. Belkin (IKI), I. Reva (FAPHI), A. Pozanenko (IKI), M. Krugov (FAPHI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200324A: (Dichiara et al. GCN 27428) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Mar. 24 (UT) 17:35:57. We found no one object within enhanced Swift-XRT position (Beardmore et al., GCN 27430). Preliminary photometry of the field is following.
```
Date       UT start t-T0    Filter  Exp. OT    Err. UL(3 sigma)
                     (mid, days)     (s)

2020-03-24 17:35:57 0.0638  R      4200  n/d   n/d  21.3
```
The photometry is based on nearby SDSS-DR12 stars.
```
RA DEC               R(Lupton transformation)
222.719432 35.941281 17.353
222.755165 35.913578 16.314
222.698647 35.902796 16.214
222.827959 35.919356 15.822
```
GCN Circular #27443
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Dichiara (NASA/GSFC/UMCP), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200324A (trigger #963260) (Dichiara et al., GCN Circ. 27428). The BAT ground-calculated position is RA, Dec = 222.682, 35.931 deg which is
```
   RA(J2000)  =  14h 50m 43.7s
   Dec(J2000) = +35d 55' 51.0"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a weak pulse that starts at ~T-40 s, peaks at ~T0, and lasts until >~T+80 s. The burst was temporarily out of the BAT FOV from T+100.39 s to T+119.39 s. There might be additional burst emission during this period. Due to this data gap, the standard data analysis pipeline is unable to estimate an accurate T90.
The time-averaged spectrum from T-38.1 to T+100.4 sec (before the burst went out of the BAT FOV) is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 1.72 +- 0.15. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.07 sec in the 15-150 keV band is 0.7 +- 0.2 ph/cm2/sec. 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/963260/BA/
GCN Circular #27445
M. Nakamura, T. Sakamoto (AGU)
We observed the field of GRB 200324A detected by Swift (Dichiara et al., GCN Circ. 27428) with the 14-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University.
22 images of 60 sec, 120 sec, 180 sec and 300 sec exposures were taken in the R filter starting from March 24 16:42:55 (UT) about 228 seconds after the trigger and stopped on March 24 19:06:11 (UT). We do not detect the optical afterglow both in the individual images and the stacked image. The estimated five sigma upper limit of the combined image (total exposure of 3240 sec) is ~17.6 mag using the USNO-B1 catalog.

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Jochen Greiner, last update: 26-Mar-2020 [Disclaimer]