Gamma-ray Burst 180510A

(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:     Thu 10 May 18 19:24:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     831810,   Seg_Num: 0   
GRB_RA:          276.318d {+18h 25m 16s} (J2000),
                 276.617d {+18h 26m 28s} (current),
                 275.505d {+18h 22m 01s} (1950)
GRB_DEC:         -31.911d {-31d 54' 38"} (J2000),
                 -31.899d {-31d 53' 57"} (current),
                 -31.940d {-31d 56' 21"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4312 [cnts]    Image_Peak=262 [image_cnts]
TRIGGER_DUR:     1.024 [sec]    
TRIGGER_INDEX:   147     E_range: 25-100 keV
BKG_INTEN:       24574 [cnts]
BKG_TIME:        69859.07 SOD {19:24:19.07} UT
BKG_DUR:         8 [sec] 
GRB_DATE:        18248 TJD;   130 DOY;   18/05/10
GRB_TIME:        69874.30 SOD {19:24:34.30} UT
GRB_PHI:          45.11 [deg]
GRB_THETA:        34.43 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     22.91 [sigma]
IMAGE_SIGNIF:    11.84 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +1  +0  +1 +69  +0
SUN_POSTN:        47.64d {+03h 10m 35s}  +17.76d {+17d 45' 45"}
SUN_DIST:        133.78 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.72d {+23h 30m 52s}   -6.75d {-06d 45' 05"}  
MOON_DIST:        74.65 [deg] 
MOON_ILLUM:      25 [%] 
GAL_COORDS:        1.54, -8.92 [deg] galactic lon,lat of the burst (or transient)        
ECL_COORDS:      275.42, -8.59 [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 = 180.68,-8.46 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:26:40 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     831810,   Seg_Num: 0
GRB_RA:          276.3303d {+18h 25m 19.27s} (J2000),
                 276.6287d {+18h 26m 30.88s} (current),
                 275.5173d {+18h 22m 04.14s} (1950)
GRB_DEC:         -31.9069d {-31d 54' 24.8"} (J2000),
                 -31.8954d {-31d 53' 43.3"} (current),
                 -31.9356d {-31d 56' 08.2"} (1950)
GRB_ERROR:       5.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.09e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.07 [sigma]
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69962.56 SOD {19:26:02.56} UT,   88.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.21 261.58 243.78
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        47.65d {+03h 10m 35s}  +17.76d {+17d 45' 46"}
SUN_DIST:        133.77 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.73d {+23h 30m 56s}   -6.75d {-06d 44' 45"}
MOON_DIST:        74.66 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.55, -8.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      275.43, -8.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.65 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:26:49 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     831810,   Seg_Num: 0
GRB_RA:          276.3303d {+18h 25m 19.2s} (J2000),
                 276.6287d {+18h 26m 30.8s} (current),
                 275.5173d {+18h 22m 04.1s} (1950)
GRB_DEC:         -31.9069d {-31d 54' 24.8"} (J2000),
                 -31.8954d {-31d 53' 43.3"} (current),
                 -31.9356d {-31d 56' 08.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       50 [cnts]
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69962.56 SOD {19:26:02.56} UT,   88.3 [sec] since BAT Trigger Time
CENTROID_X:      269.78,  raw= 270  [pixels]
CENTROID_Y:      304.74,  raw= 305  [pixels]
ROLL:            95.89 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   14.96
GRB_POS_XRT_Z:   -86.30
IMAGE_URL:       sw00831810000msxps_rw.img
SUN_POSTN:        47.65d {+03h 10m 35s}  +17.76d {+17d 45' 47"}
SUN_DIST:        133.77 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.73d {+23h 30m 56s}   -6.75d {-06d 44' 43"}
MOON_DIST:        74.66 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.55, -8.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      275.43, -8.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:26:52 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     831810,   Seg_Num: 0
GRB_RA:          276.3303d {+18h 25m 19.2s} (J2000),
                 276.6287d {+18h 26m 30.8s} (current),
                 275.5173d {+18h 22m 04.1s} (1950)
GRB_DEC:         -31.9069d {-31d 54' 24.8"} (J2000),
                 -31.8954d {-31d 53' 43.3"} (current),
                 -31.9356d {-31d 56' 08.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       50 [cnts]
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69962.56 SOD {19:26:02.56} UT,   88.3 [sec] since BAT Trigger Time
CENTROID_X:      269.78,  raw= 270  [pixels]
CENTROID_Y:      304.74,  raw= 305  [pixels]
ROLL:            95.89 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   14.96
GRB_POS_XRT_Z:   -86.30
IMAGE_URL:       sw00831810000msxps_rw.img
SUN_POSTN:        47.65d {+03h 10m 35s}  +17.76d {+17d 45' 47"}
SUN_DIST:        133.77 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.74d {+23h 30m 56s}   -6.75d {-06d 44' 43"}
MOON_DIST:        74.66 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.55, -8.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      275.43, -8.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:28:22 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     831810,   Seg_Num: 0
GRB_RA:          276.318d {+18h 25m 16s} (J2000),
                 276.617d {+18h 26m 28s} (current),
                 275.505d {+18h 22m 01s} (1950)
GRB_DEC:         -31.911d {-31d 54' 38"} (J2000),
                 -31.899d {-31d 53' 57"} (current),
                 -31.940d {-31d 56' 21"} (1950)
GRB_DATE:        18248 TJD;   130 DOY;   18/05/10
GRB_TIME:        69874.30 SOD {19:24:34.30} UT
TRIGGER_INDEX:   147
GRB_PHI:          45.11 [deg]
GRB_THETA:        34.43 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     22.91 [sigma]
IMAGE_SIGNIF:    11.84 [sigma]
LC_URL:          sw00831810000msb.lc
SUN_POSTN:        47.65d {+03h 10m 35s}  +17.76d {+17d 45' 48"}
SUN_DIST:        133.78 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.75d {+23h 30m 59s}   -6.74d {-06d 44' 27"}
MOON_DIST:        74.69 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.54, -8.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      275.42, -8.59 [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 = 180.68,-8.46 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:34:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
POINT_ROLL:      95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69971.21 SOD {19:26:11.21} UT,   96.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.658
N_STARS:         190
X_OFFSET:        576 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1535 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00831810000msufc0096.fits
SUN_POSTN:        47.65d {+03h 10m 36s}  +17.76d {+17d 45' 51"}
SUN_DIST:        133.80 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.80d {+23h 31m 12s}   -6.72d {-06d 43' 23"}
MOON_DIST:        74.75 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:34:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
POINT_ROLL:      95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69971.21 SOD {19:26:11.21} UT,   96.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.658
N_STARS:         190
X_OFFSET:        576 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1535 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00831810000msufc0096.fits
SUN_POSTN:        47.65d {+03h 10m 36s}  +17.76d {+17d 45' 52"}
SUN_DIST:        133.80 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.80d {+23h 31m 12s}   -6.72d {-06d 43' 21"}
MOON_DIST:        74.75 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [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:     Thu 10 May 18 19:37:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
ROLL:            95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69971.21 SOD {19:26:11.21} UT,   96.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     547673192
X_OFFSET:        937 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1097
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00831810000msuni0117.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.76d {+17d 45' 53"}
SUN_DIST:        133.80 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.82d {+23h 31m 17s}   -6.72d {-06d 42' 54"}
MOON_DIST:        74.77 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [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:     Thu 10 May 18 19:37:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
ROLL:            95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  69971.21 SOD {19:26:11.21} UT,   96.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     547673192
X_OFFSET:        937 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1097
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00831810000msuni0117.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.76d {+17d 45' 53"}
SUN_DIST:        133.80 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.82d {+23h 31m 18s}   -6.71d {-06d 42' 51"}
MOON_DIST:        74.78 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [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:     Thu 10 May 18 19:38:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
POINT_ROLL:      95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  70184.09 SOD {19:29:44.09} UT,   309.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.216
N_STARS:         27
X_OFFSET:        617 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1576 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00831810000msufc0309.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.76d {+17d 45' 54"}
SUN_DIST:        133.81 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.83d {+23h 31m 19s}   -6.71d {-06d 42' 41"}
MOON_DIST:        74.78 [deg]
MOON_ILLUM:      24 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st SrcList Notice.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 May 18 19:38:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
POINT_ROLL:      95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  70184.09 SOD {19:29:44.09} UT,   309.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.216
N_STARS:         27
X_OFFSET:        617 [pixels]
Y_OFFSET:        459 [pixels]
X_MAX:           1576 [pixels]
Y_MAX:           1418 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00831810000msufc0309.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.77d {+17d 45' 54"}
SUN_DIST:        133.81 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.83d {+23h 31m 20s}   -6.71d {-06d 42' 39"}
MOON_DIST:        74.79 [deg]
MOON_ILLUM:      24 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [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:     Thu 10 May 18 19:39:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
ROLL:            95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  70184.09 SOD {19:29:44.09} UT,   309.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     547673405
X_OFFSET:        937 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1097
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00831810000msuni0330.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.77d {+17d 45' 55"}
SUN_DIST:        133.81 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.84d {+23h 31m 22s}   -6.71d {-06d 42' 26"}
MOON_DIST:        74.80 [deg]
MOON_ILLUM:      24 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st Image Notice.  
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:     Thu 10 May 18 19:39:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     831810,   Seg_Num: 0
POINT_RA:        276.303d {+18h 25m 13s} (J2000)
POINT_DEC:       -31.908d {-31d 54' 29"} (J2000)
ROLL:            95.889d
IMG_START_DATE:  18248 TJD;   130 DOY;   18/05/10
IMG_START_TIME:  70184.09 SOD {19:29:44.09} UT,   309.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     547673405
X_OFFSET:        937 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1097
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw00831810000msuni0330.fits
SUN_POSTN:        47.65d {+03h 10m 37s}  +17.77d {+17d 45' 55"}
SUN_DIST:        133.81 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      352.84d {+23h 31m 23s}   -6.71d {-06d 42' 24"}
MOON_DIST:        74.80 [deg]
MOON_ILLUM:      24 [%]
GAL_COORDS:        1.54, -8.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      275.41, -8.59 [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 #22695
J.D. Gropp (PSU), A. Deich (PSU), J. A. Kennea (PSU), S. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 19:24:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180510A (trigger=831810). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 276.318, -31.911 which is
```
   RA(J2000) = 18h 25m 16s
   Dec(J2000) = -31d 54' 38"
```
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 70 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 19:26:02.5 UT, 88.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 276.3303, -31.9069 which is equivalent to:
```
   RA(J2000)  = +18h 25m 19.27s
   Dec(J2000) = -31d 54' 24.8"
```
with an uncertainty of 5.5 arcseconds (radius, 90% containment). This location is 40 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 1.09e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 96 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. Results from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.26.
Burst Advocate for this burst is J.D. Gropp (jdg44 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/too.html.)
GCN Circular #22704
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J. D. Gropp (PSU), H. A. Krimm (NSF/USRA), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180510A (trigger #831810) (Gropp et al. GCN Circ. 22695). The BAT ground-calculated position is RA, Dec = 276.335, -31.917 deg which is
```
  RA(J2000)  =  18h 25m 20.5s
  Dec(J2000) = -31d 55' 00.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~ T-6 s and ends at ~ T+ 65 s. The major peak occurs at ~ T+6 s. T90 (15-350 keV) is 40.4 +- 10.4 sec (estimated error including systematics).
The time-averaged spectrum from T-6.21 to T+65.76 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.06 +- 0.23, and Epeak of 126.8 +- 52.0 keV (chi squared 54.94 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.2 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+5.26 sec in the 15-150 keV band is 8.9 +- 0.5 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.48 +- 0.05 (chi squared 65.55 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/831810/BA/
GCN Circular #22707
A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and J.D. Gropp report on behalf of the Swift-XRT team:
We have analysed 4.9 ks of XRT data for GRB 180510A (Gropp et al. GCN Circ. 22695), from 77 s to 40.5 ks after the BAT trigger. The data comprise 228 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 276.3314, -31.9081 which is equivalent to:
```
RA (J2000): 18 25 19.54
Dec(J2000): -31 54 29.1
```
with an uncertainty of 3.6 arcsec (radius, 90% confidence).
The late-time light curve (from T0+15.8 ks) can be modelled with a power-law decay with a decay index of alpha=1.2 (+/-0.4).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.94 (+0.08, -0.07). The best-fitting absorption column is 5.2 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 2.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.01 (+0.30, -0.28) and a best-fitting absorption column of 3.5 (+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 3.8 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.5 (+1.4, -1.2) x 10^21 cm^-2
Galactic foreground: 2.1 x 10^21 cm^-2
Excess significance: 1.9 sigma
Photon index:	     2.01 (+0.30, -0.28)
```
If the light curve continues to decay with a power-law decay index of 1.2, the count rate at T+24 hours will be 0.016 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.2 x 10^-13 (9.4 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/00831810.
This circular is an official product of the Swift-XRT team.
GCN Circular #22709
A. A. Breeveld (UCL-MSSL), S. R. Oates (U.Warwick) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180510A 97=20 s after the BAT trigger (Gropp et al., GCN Circ. 22695). A source is detected at the edge of the refined XRT position (D=E2=80=99A= i et=20 al. GCN Circ. 22707) but this is consistent with the position of a=20 USNO-B1.0 source (at 276.332, -31.908), and it is not clear if we see=20 any fading. Preliminary detections and 3-sigma upper limits using the=20 UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358,=20 373) for the first finding chart (FC) exposure and subsequent exposures a= re:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            97          247          147         20.0 =C2=B1 0.3
white            28989        29010          21          >19.2
v		 22961        23272         301          >19.4
b                28076        28983         885          20.2 =C2=B1 0.2
u                  310          322          12          >17.6
uvw1             15854        16753         886          >20.6
uvw2             22055        22955         886          >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.26 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22722
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 180510A (Swift detection of a burst: Gropp et al., GCN 22695; Ukwatta et al., GCN 22704) triggered Konus-Wind at T0=3D69881.488 s UT (19:24:41.488).
The burst light curve shows a single pulse which starts at ~T0-6.4 s and has a total duration of ~23.5 s. The emission is seen up to ~1 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.07(-0.14,+0.21)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0-0.064 s, of 3.53(-1.13,+1.18)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+16.640 s) is best fit in the 20 keV - 1.5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with=A0 alpha =3D -1.14(-0.31,+0.38), and Ep =3D 237(-56,+126) keV (chi2 =3D 93/60 dof). Fitting by the GRB (Band) model yields alpha =3D -0.62(-0.66,+1.24), Ep =3D 150(-54,+131) keV, and an upper limit on the high energy photon index: beta < -1.90 (chi2 =3D 91/59 dof).
The spectrum near the peak count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1 MeV range by a power law with exponential cutoff model with=A0 alpha =3D -0.97(-0.30,+0.35), and Ep =3D 202(-34,+54) keV (chi2 =3D 75/50 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.37 (chi2 =3D 75/49 dof).
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180510_T69881/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #22730
T. Horiuchi, H. Hanayama, M. Honma (IAO, NAOJ), R. Itoh, K. L. Murata and N. Kawai (Tokyo Tech) report on behalf of the MITSuME and OISTER collaboration:
We observed the field of GRB 180510A (Gropp et al.,GCN 22695) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 2018-05-10 19:29:21 UT, (287 seconds after the burst). No new or fading source is detected within the Swift-XRT error circle.
We note that there is faint (~20mag) source detected in DSS images within XRT error circle (at 18:25:19.2, -31:54:22.7) but the source did not shows temporal variability during observation (~45 min).
we derive the following upper limits using UCAC-4 catalog for flux calibration.
```
#T0+[sec]  MID-UT    T-EXP[sec] g'   Rc   Ic
-------------------------------------------------------------------
287 19:55:17 2700.0 >19.4 >20.4 >20.2
-------------------------------------------------------------------
T0+ : Elapsed time after the burst [hour]
T-EXP: Total Exposure time [sec]
```

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Jochen Greiner, last update: 15-May-2018 [Disclaimer]