Gamma-ray Burst 200512A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:33:58 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     971846,   Seg_Num: 0
GRB_RA:            7.396d {+00h 29m 35s} (J2000),
                   7.656d {+00h 30m 37s} (current),
                   6.757d {+00h 27m 02s} (1950)
GRB_DEC:          -2.199d {-02d 11' 54"} (J2000),
                  -2.086d {-02d 05' 10"} (current),
                  -2.475d {-02d 28' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       13723 [cnts]    Image_Peak=339 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       118124 [cnts]
BKG_TIME:        73935.07 SOD {20:32:15.07} UT
BKG_DUR:         40 [sec]
GRB_DATE:        18981 TJD;   133 DOY;   20/05/12
GRB_TIME:        73995.93 SOD {20:33:15.93} UT
GRB_PHI:         -120.54 [deg]
GRB_THETA:         5.53 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.60 [sigma]
IMAGE_SIGNIF:    7.66 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -2  +0  +0 -68  +0 
SUN_POSTN:        50.16d {+03h 20m 38s}  +18.41d {+18d 24' 35"}
SUN_DIST:         46.56 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.69d {+20h 22m 45s}  -22.28d {-22d 16' 49"}
MOON_DIST:        63.36 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.15,-64.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        5.92, -4.95 [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 = 213.96,17.94 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Tue 12 May 20 20:34:54 UT 
NOTICE_TYPE:     Swift-XRT Position 
TRIGGER_NUM:     971846,   Seg_Num: 0 
GRB_RA:            7.4128d {+00h 29m 39.07s} (J2000), 
                   7.6731d {+00h 30m 41.55s} (current), 
                   6.7737d {+00h 27m 05.68s} (1950) 
GRB_DEC:          -2.2109d {-02d 12' 39.2"} (J2000), 
                  -2.0985d {-02d 05' 54.6"} (current), 
                  -2.4872d {-02d 29' 13.8"} (1950) 
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment] 
GRB_INTEN:       7.60e-10 [erg/cm2/sec] 
GRB_SIGNIF:      5.65 [sigma] 
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12 
IMG_START_TIME:  74065.55 SOD {20:34:25.55} UT,   69.6 [sec] since BAT Trigger Time 
TAM[0-3]:        327.64 237.19 261.58 243.61 
AMPLIFIER:       2 
WAVEFORM:        134 
SUN_POSTN:        50.16d {+03h 20m 38s}  +18.41d {+18d 24' 36"} 
SUN_DIST:         46.55 [deg]   Sun_angle= 2.8 [hr] (West of Sun) 
MOON_POSTN:      305.70d {+20h 22m 47s}  -22.28d {-22d 16' 45"} 
MOON_DIST:        63.36 [deg] 
MOON_ILLUM:      67 [%] 
GAL_COORDS:      110.18,-64.54 [deg] galactic lon,lat of the burst 
ECL_COORDS:        5.93, -4.97 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Coordinates.   
COMMENTS:        The XRT position is 1.26 arcmin from the BAT position.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Tue 12 May 20 20:35:06 UT 
NOTICE_TYPE:     Swift-XRT Image 
TRIGGER_NUM:     971846,   Seg_Num: 0 
GRB_RA:            7.4128d {+00h 29m 39.0s} (J2000), 
                   7.6731d {+00h 30m 41.5s} (current), 
                   6.7737d {+00h 27m 05.6s} (1950) 
GRB_DEC:          -2.2109d {-02d 12' 39.2"} (J2000), 
                  -2.0985d {-02d 05' 54.6"} (current), 
                  -2.4872d {-02d 29' 13.8"} (1950) 
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic] 
GRB_INTEN:       32 [cnts] 
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12 
IMG_START_TIME:  74065.55 SOD {20:34:25.55} UT,   69.6 [sec] since BAT Trigger Time 
CENTROID_X:      287.21,  raw= 287  [pixels] 
CENTROID_Y:      268.37,  raw= 268  [pixels] 
ROLL:            62.03 [deg] 
GAIN:            1 
MODE:            3, Long Image mode 
WAVEFORM:        134 
EXPO_TIME:       2.50 [sec] 
GRB_POS_XRT_Y:   -70.06 
GRB_POS_XRT_Z:   -47.59 
IMAGE_URL:       sw00971846000msxps_rw.img 
SUN_POSTN:        50.16d {+03h 20m 38s}  +18.41d {+18d 24' 36"} 
SUN_DIST:         46.55 [deg]   Sun_angle= 2.8 [hr] (West of Sun) 
MOON_POSTN:      305.70d {+20h 22m 48s}  -22.28d {-22d 16' 44"} 
MOON_DIST:        63.36 [deg] 
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.18,-64.54 [deg] galactic lon,lat of the burst 
ECL_COORDS:        5.93, -4.97 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:35:08 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     971846,   Seg_Num: 0
GRB_RA:            7.4128d {+00h 29m 39.0s} (J2000),
                   7.6731d {+00h 30m 41.5s} (current),
                   6.7737d {+00h 27m 05.6s} (1950)
GRB_DEC:          -2.2109d {-02d 12' 39.2"} (J2000),
                  -2.0985d {-02d 05' 54.6"} (current),
                  -2.4872d {-02d 29' 13.8"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74065.55 SOD {20:34:25.55} UT,   69.6 [sec] since BAT Trigger Time
CENTROID_X:      287.21,  raw= 287  [pixels]
CENTROID_Y:      268.37,  raw= 268  [pixels]
ROLL:            62.03 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -70.06
GRB_POS_XRT_Z:   -47.59
IMAGE_URL:       sw00971846000msxps_rw.img
SUN_POSTN:        50.16d {+03h 20m 38s}  +18.41d {+18d 24' 36"}
SUN_DIST:         46.55 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.70d {+20h 22m 48s}  -22.28d {-22d 16' 43"}
MOON_DIST:        63.36 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.18,-64.54 [deg] galactic lon,lat of the burst
ECL_COORDS:        5.93, -4.97 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Tue 12 May 20 20:37:52 UT 
NOTICE_TYPE:     Swift-BAT GRB Lightcurve 
TRIGGER_NUM:     971846,   Seg_Num: 0 
GRB_RA:            7.396d {+00h 29m 35s} (J2000), 
                   7.656d {+00h 30m 37s} (current), 
                   6.757d {+00h 27m 02s} (1950) 
GRB_DEC:          -2.199d {-02d 11' 54"} (J2000), 
                  -2.086d {-02d 05' 10"} (current), 
                  -2.475d {-02d 28' 29"} (1950) 
GRB_DATE:        18981 TJD;   133 DOY;   20/05/12 
GRB_TIME:        73995.93 SOD {20:33:15.93} UT 
TRIGGER_INDEX:   298 
GRB_PHI:         -120.54 [deg] 
GRB_THETA:         5.53 [deg] 
DELTA_TIME:      -5.00 [sec] 
TRIGGER_DUR:     4.096 [sec]  
SOLN_STATUS:     0x3 
RATE_SIGNIF:     8.60 [sigma] 
IMAGE_SIGNIF:    7.66 [sigma] 
LC_URL:          sw00971846000msb.lc 
SUN_POSTN:        50.16d {+03h 20m 39s}  +18.41d {+18d 24' 38"} 
SUN_DIST:         46.57 [deg]   Sun_angle= 2.8 [hr] (West of Sun) 
MOON_POSTN:      305.73d {+20h 22m 54s}  -22.28d {-22d 16' 30"} 
MOON_DIST:        63.32 [deg] 
MOON_ILLUM:      67 [%] 
GAL_COORDS:      110.15,-64.53 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:        5.92, -4.95 [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 = 213.96,17.94 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:43:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.392d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.200d {-02d 11' 59"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74073.90 SOD {20:34:33.90} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.803
N_STARS:         10
X_OFFSET:        512 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      26
PHOTO_THRESH:    16
SL_URL:          sw00971846000msufc0077.fits
SUN_POSTN:        50.17d {+03h 20m 40s}  +18.41d {+18d 24' 41"}
SUN_DIST:         46.57 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.78d {+20h 23m 07s}  -22.27d {-22d 16' 02"}
MOON_DIST:        63.27 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.92, -4.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:43:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.392d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.200d {-02d 11' 59"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74073.90 SOD {20:34:33.90} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.803
N_STARS:         10
X_OFFSET:        512 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      26
PHOTO_THRESH:    16
SL_URL:          sw00971846000msufc0077.fits
SUN_POSTN:        50.17d {+03h 20m 40s}  +18.41d {+18d 24' 41"}
SUN_DIST:         46.57 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.78d {+20h 23m 08s}  -22.27d {-22d 16' 00"}
MOON_DIST:        63.27 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.92, -4.95 [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 12 May 20 20:44:22 UT 
NOTICE_TYPE:     Swift-UVOT Image 
TRIGGER_NUM:     971846,   Seg_Num: 0 
POINT_RA:          7.392d {+00h 29m 34s} (J2000) 
POINT_DEC:        -2.200d {-02d 11' 59"} (J2000) 
ROLL:            62.030d 
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12 
IMG_START_TIME:  74073.90 SOD {20:34:33.90} UT,   78.0 [sec] since BAT Trigger Time 
FILTER:          10, White 
EXPOSURE_ID:     611008498 
X_OFFSET:        955 [pixels] 
Y_OFFSET:        938 [pixels] 
WIDTH:           160 [pixels] 
HEIGHT:          160 [pixels] 
X_GRB_POS:       1115 
Y_GRB_POS:       1098 
BINNING_INDEX:   1 
IM_URL:          sw00971846000msuni0102.fits 
SUN_POSTN:        50.17d {+03h 20m 40s}  +18.41d {+18d 24' 42"} 
SUN_DIST:         46.57 [deg]   Sun_angle= 2.8 [hr] (West of Sun) 
MOON_POSTN:      305.79d {+20h 23m 09s}  -22.27d {-22d 15' 57"} 
MOON_DIST:        63.26 [deg] 
MOON_ILLUM:      67 [%] 
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction 
ECL_COORDS:        5.92, -4.95 [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 12 May 20 20:44:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.392d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.200d {-02d 11' 59"} (J2000)
ROLL:            62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74073.90 SOD {20:34:33.90} UT,   78.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     611008498
X_OFFSET:        955 [pixels]
Y_OFFSET:        938 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1098
BINNING_INDEX:   1
IM_URL:          sw00971846000msuni0102.fits
SUN_POSTN:        50.17d {+03h 20m 40s}  +18.41d {+18d 24' 42"}
SUN_DIST:         46.57 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.79d {+20h 23m 09s}  -22.27d {-22d 15' 57"}
MOON_DIST:        63.26 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.92, -4.95 [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 12 May 20 20:49:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 07"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74231.87 SOD {20:37:11.87} UT,   235.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.300
N_STARS:         11
X_OFFSET:        635 [pixels]
Y_OFFSET:        618 [pixels]
X_MAX:           1594 [pixels]
Y_MAX:           1577 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00971846000msufc0235.fits
SUN_POSTN:        50.17d {+03h 20m 41s}  +18.41d {+18d 24' 45"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.83d {+20h 23m 19s}  -22.26d {-22d 15' 34"}
MOON_DIST:        63.22 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:49:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 07"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74231.87 SOD {20:37:11.87} UT,   235.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.300
N_STARS:         11
X_OFFSET:        635 [pixels]
Y_OFFSET:        618 [pixels]
X_MAX:           1594 [pixels]
Y_MAX:           1577 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00971846000msufc0235.fits
SUN_POSTN:        50.17d {+03h 20m 41s}  +18.41d {+18d 24' 45"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.83d {+20h 23m 20s}  -22.26d {-22d 15' 33"}
MOON_DIST:        63.22 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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 12 May 20 20:50:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 07"} (J2000)
ROLL:            62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74231.87 SOD {20:37:11.87} UT,   235.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     611008656
X_OFFSET:        955 [pixels]
Y_OFFSET:        938 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1098
BINNING_INDEX:   1
IM_URL:          sw00971846000msuni0260.fits
SUN_POSTN:        50.17d {+03h 20m 41s}  +18.41d {+18d 24' 46"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.84d {+20h 23m 23s}  -22.26d {-22d 15' 26"}
MOON_DIST:        63.21 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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 12 May 20 20:50:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 07"} (J2000)
ROLL:            62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74231.87 SOD {20:37:11.87} UT,   235.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     611008656
X_OFFSET:        955 [pixels]
Y_OFFSET:        938 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1098
BINNING_INDEX:   1
IM_URL:          sw00971846000msuni0260.fits
SUN_POSTN:        50.17d {+03h 20m 41s}  +18.41d {+18d 24' 46"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.85d {+20h 23m 23s}  -22.26d {-22d 15' 26"}
MOON_DIST:        63.21 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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 #27726
K. K. Simpson (PSU), V. D'Elia (SSDC), C. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 20:33:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200512A (trigger=971846). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 7.396, -2.199 which is
```
   RA(J2000) = 00h 29m 35s
   Dec(J2000) = -02d 11' 54"
```
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 20 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 20:34:25.5 UT, 69.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 7.41520, -2.21052 which is equivalent to:
```
   RA(J2000)  = 00h 29m 39.65s
   Dec(J2000) = -02d 12' 37.9"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 80 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.94 x 10^20 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 7.60e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 235 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is K. K. Simpson (kira.simpson1984 AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:54:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 06"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74858.44 SOD {20:47:38.44} UT,   862.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.409
N_STARS:         190
X_OFFSET:        395 [pixels]
Y_OFFSET:        378 [pixels]
X_MAX:           1834 [pixels]
Y_MAX:           1817 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00971846000msufc0862.fits
SUN_POSTN:        50.17d {+03h 20m 42s}  +18.41d {+18d 24' 48"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.89d {+20h 23m 33s}  -22.25d {-22d 15' 05"}
MOON_DIST:        63.17 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 20:54:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 06"} (J2000)
POINT_ROLL:      62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74858.44 SOD {20:47:38.44} UT,   862.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.409
N_STARS:         190
X_OFFSET:        395 [pixels]
Y_OFFSET:        378 [pixels]
X_MAX:           1834 [pixels]
Y_MAX:           1817 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00971846000msufc0862.fits
SUN_POSTN:        50.17d {+03h 20m 42s}  +18.41d {+18d 24' 48"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.89d {+20h 23m 33s}  -22.25d {-22d 15' 04"}
MOON_DIST:        63.17 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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 12 May 20 20:56:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     971846,   Seg_Num: 0
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 06"} (J2000)
ROLL:            62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74858.44 SOD {20:47:38.44} UT,   862.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     611009283
X_OFFSET:        954 [pixels]
Y_OFFSET:        937 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1114
Y_GRB_POS:       1097
BINNING_INDEX:   1
IM_URL:          sw00971846000msuni0887.fits
SUN_POSTN:        50.17d {+03h 20m 42s}  +18.41d {+18d 24' 49"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.90d {+20h 23m 36s}  -22.25d {-22d 14' 56"}
MOON_DIST:        63.15 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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:     Tue 12 May 20 20:56:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     971846,   Seg_Num: 0 
POINT_RA:          7.391d {+00h 29m 34s} (J2000)
POINT_DEC:        -2.202d {-02d 12' 06"} (J2000)
ROLL:            62.030d
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74858.44 SOD {20:47:38.44} UT,   862.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     611009283
X_OFFSET:        954 [pixels]
Y_OFFSET:        937 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1114
Y_GRB_POS:       1097
BINNING_INDEX:   1
IM_URL:          sw00971846000msuni0887.fits
SUN_POSTN:        50.17d {+03h 20m 42s}  +18.41d {+18d 24' 49"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      305.90d {+20h 23m 37s}  -22.25d {-22d 14' 55"}  
MOON_DIST:        63.15 [deg] 
MOON_ILLUM:      67 [%] 
GAL_COORDS:      110.14,-64.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        5.91, -4.96 [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:        If you have elected to receive attachments:
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 May 20 21:09:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     971846,   Seg_Num: 0
GRB_RA:            7.4148d {+00h 29m 39.55s} (J2000),
                   7.6751d {+00h 30m 42.03s} (current),
                   6.7757d {+00h 27m 06.16s} (1950)
GRB_DEC:          -2.2101d {-02d 12' 36.3"} (J2000),
                  -2.0977d {-02d 05' 51.7"} (current),
                  -2.4864d {-02d 29' 10.9"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18981 TJD;   133 DOY;   20/05/12
IMG_START_TIME:  74227.00 SOD {20:37:07.00} UT,   231.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        50.18d {+03h 20m 44s}  +18.42d {+18d 24' 57"}
SUN_DIST:         46.58 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      306.03d {+20h 24m 06s}  -22.23d {-22d 13' 50"}
MOON_DIST:        63.06 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      110.19,-64.54 [deg] galactic lon,lat of the burst
ECL_COORDS:        5.93, -4.97 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #27728
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 744 s of XRT Photon Counting mode data and 1 UVOT images for GRB 200512A, 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 = 7.41477, -2.21036 which is equivalent to:
```
RA (J2000): 00h 29m 39.54s
Dec (J2000): -02d 12' 37.3"
```
with an uncertainty of 1.4 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 #27729
A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and K.K. Simpson report on behalf of the Swift-XRT team:
We have analysed 7.4 ks of XRT data for GRB 200512A (Simpson et al. GCN Circ. 27726), from 63 s to 58.1 ks after the BAT trigger. The data comprise 153 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. 27728).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.42 (+0.20, -0.37), followed by a break at T+161 s to an alpha of 1.93 (+/-0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.49 (+/-0.13). The best-fitting absorption column is 2.6 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 2.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.20 (+0.23, -0.22) and a best-fitting absorption column of 2.4 (+1.4, -1.2) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 6.1 x 10^-11 (6.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.4 (+1.4, -1.2) x 10^21 cm^-2
Galactic foreground: 2.9 x 10^20 cm^-2
Excess significance: 3.0 sigma
Photon index:	     1.20 (+0.23, -0.22)
```
If the light curve continues to decay with a power-law decay index of 1.93, the count rate at T+24 hours will be 6.7 x 10^-5 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.1 x 10^-15 (4.5 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00971846.
This circular is an official product of the Swift-XRT team.
GCN Circular #27730
F. E. Marshall (NASA/GSFC) and K. K. Simpson (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200512A 78 s after the BAT trigger (Simpson et al., GCN Circ. 27726). No optical afterglow consistent with the enhanced XRT position (Goad et al., GCN Circ. 27728) 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            78          228          147         >19.9
u_FC               236          486          246         >19.8
v                  567          760           39         >17.1
b                  493          858           58         >19.0
u                  236          833          285         >19.7
w1                 617          809           39         >17.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27731
P. Veres (UAH) reports on behalf of the Fermi-GBM Team:
Swift-BAT detected GRB 200512A at 20:33:15 UT (GCN 27726). There was no Fermi-GBM onboard trigger around the event.
An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified no counterparts.
The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around BAT trigger time. A transient source was identified whose most significant timescale according to the search is 8.192 s, with a log likelihood ratio of 23. It has consistent location, and it is consistent with a "normal" spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3) for a GRB.
[1] Goldstein et al. 2019 arXiv:1903.12597
GCN Circular #27733
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 200512A (Simpson et al., GCN 27726) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on May 13, from 19:03 to 19:25 UT (corresponding to 23.50 to 23.87 hours from the GRB trigger time) with the Bessel I and R filters.
We performed a series of 5x120s exposures in R and I. We do not detect any fading sources in the individual frames (or in stacked images). Using the USNO-B.1 catalog as reference, we obtain the following 3-sigma upper limits:
R > 20.90
I > 20.29
These magnitudes are not corrected for galactic extinction.
R.S. is funded by NSF AST grant #1831682
GCN Circular #27742
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), K. K. Simpson (PSU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 200512A (trigger #971846) (Simpson et al., GCN Circ. 27726). The BAT ground-calculated position is RA, Dec = 7.417, -2.217 deg which is
```
   RA(J2000)  =  00h 29m 40.2s
   Dec(J2000) = -02d 13' 01.1"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single-pulse structure. The main emission starts at ~T-3 s, peaks at ~T+3 s, and ends at ~T+40 s. In addition, there are some weak emission that lasts until ~T+80 s. T90 (15-350 keV) is 74.0 +- 14.3 sec (estimated error including systematics).
The time-averaged spectrum from T-2.86 to T+78.14 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.68 +- 0.18. The fluence in the 15-150 keV band is 8.1 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.14 sec in the 15-150 keV band is 0.4 +- 0.1 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/971846/BA/

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Jochen Greiner, last update: 15-May-2020 [Disclaimer]