Gamma-ray Burst 180410A

(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 10 Apr 18 08:04:47 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.981d {+06h 23m 56s} (J2000),
                  96.239d {+06h 24m 57s} (current),
                  95.278d {+06h 21m 07s} (1950)
GRB_DEC:         +12.808d {+12d 48' 28"} (J2000),
                 +12.797d {+12d 47' 49"} (current),
                 +12.835d {+12d 50' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2364 [image_cnts]
TRIGGER_DUR:     96.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        18218 TJD;   100 DOY;   18/04/10
GRB_TIME:        28979.23 SOD {08:02:59.23} UT
GRB_PHI:         155.92 [deg]
GRB_THETA:        33.59 [deg]
SOLN_STATUS:     0x20000013
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.52 [sigma]
MERIT_PARAMS:     +1  +0  +0  +7  +1  +0  +0  +1 -24  +0 
SUN_POSTN:        18.85d {+01h 15m 25s}   +7.97d {+07d 58' 26"}
SUN_DIST:         76.02 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.86d {+20h 59m 27s}  -17.03d {-17d 01' 30"}
MOON_DIST:       142.50 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.42, -0.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       95.93,-10.51 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 88.90,-4.48 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(28.0<100sec) coincident with the FERMI_GBM event (trignum=545040212).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:03:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     545040212
GRB_RA:          105.067d {+07h 00m 16s} (J2000),
                 105.345d {+07h 01m 23s} (current),
                 104.305d {+06h 57m 13s} (1950)
GRB_DEC:         +24.167d {+24d 10' 00"} (J2000),
                 +24.140d {+24d 08' 24"} (current),
                 +24.237d {+24d 14' 14"} (1950)
GRB_ERROR:       28.23 [deg radius, statistical plus systematic]
GRB_INTEN:       93 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18218 TJD;   100 DOY;   18/04/10
GRB_TIME:        29007.79 SOD {08:03:27.79} UT
GRB_PHI:         250.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.07
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:        18.85d {+01h 15m 25s}   +7.97d {+07d 58' 25"}
SUN_DIST:         83.57 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      314.86d {+20h 59m 25s}  -17.03d {-17d 01' 35"}
MOON_DIST:       151.53 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      192.02, 12.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      103.72,  1.44 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180410336/quicklook/glg_lc_medres34_bn180410336.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 222.82,17.58 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:06:18 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.9557d {+06h 23m 49.36s} (J2000),
                  96.2128d {+06h 24m 51.07s} (current),
                  95.2521d {+06h 21m 00.50s} (1950)
GRB_DEC:         +12.8112d {+12d 48' 40.3"} (J2000),
                 +12.8004d {+12d 48' 01.5"} (current),
                 +12.8384d {+12d 50' 18.1"} (1950)
GRB_ERROR:       5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.55e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.00 [sigma]
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29149.88 SOD {08:05:49.88} UT,   170.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.16 261.69 243.35
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        18.85d {+01h 15m 25s}   +7.97d {+07d 58' 27"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.88d {+20h 59m 30s}  -17.02d {-17d 01' 21"}
MOON_DIST:       142.46 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.18 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.91,-10.51 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.52 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:06:26 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.9557d {+06h 23m 49.3s} (J2000),
                  96.2128d {+06h 24m 51.0s} (current),
                  95.2521d {+06h 21m 00.5s} (1950)
GRB_DEC:         +12.8112d {+12d 48' 40.3"} (J2000),
                 +12.8004d {+12d 48' 01.5"} (current),
                 +12.8384d {+12d 50' 18.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       64 [cnts]
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29149.88 SOD {08:05:49.88} UT,   170.7 [sec] since BAT Trigger Time
CENTROID_X:      282.62,  raw= 283  [pixels]
CENTROID_Y:      306.52,  raw= 307  [pixels]
ROLL:            275.12 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   19.15
GRB_POS_XRT_Z:   -56.03
IMAGE_URL:       sw00824063000msxps_rw.img
SUN_POSTN:        18.85d {+01h 15m 25s}   +7.97d {+07d 58' 28"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.88d {+20h 59m 31s}  -17.02d {-17d 01' 20"}
MOON_DIST:       142.46 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.18 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.91,-10.51 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:06:28 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.9557d {+06h 23m 49.3s} (J2000),
                  96.2128d {+06h 24m 51.0s} (current),
                  95.2521d {+06h 21m 00.5s} (1950)
GRB_DEC:         +12.8112d {+12d 48' 40.3"} (J2000),
                 +12.8004d {+12d 48' 01.5"} (current),
                 +12.8384d {+12d 50' 18.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       64 [cnts]
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29149.88 SOD {08:05:49.88} UT,   170.7 [sec] since BAT Trigger Time
CENTROID_X:      282.62,  raw= 283  [pixels]
CENTROID_Y:      306.52,  raw= 307  [pixels]
ROLL:            275.12 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   19.15
GRB_POS_XRT_Z:   -56.03
IMAGE_URL:       sw00824063000msxps_rw.img
SUN_POSTN:        18.85d {+01h 15m 25s}   +7.97d {+07d 58' 28"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.88d {+20h 59m 31s}  -17.02d {-17d 01' 20"}
MOON_DIST:       142.46 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.18 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.91,-10.51 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:07:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.981d {+06h 23m 56s} (J2000),
                  96.239d {+06h 24m 57s} (current),
                  95.278d {+06h 21m 07s} (1950)
GRB_DEC:         +12.808d {+12d 48' 28"} (J2000),
                 +12.797d {+12d 47' 49"} (current),
                 +12.835d {+12d 50' 06"} (1950)
GRB_DATE:        18218 TJD;   100 DOY;   18/04/10
GRB_TIME:        28979.23 SOD {08:02:59.23} UT
TRIGGER_INDEX:   20000
GRB_PHI:         155.92 [deg]
GRB_THETA:        33.59 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     96.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.52 [sigma]
LC_URL:          sw00824063000msb.lc
SUN_POSTN:        18.86d {+01h 15m 25s}   +7.97d {+07d 58' 28"}
SUN_DIST:         76.01 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.89d {+20h 59m 33s}  -17.02d {-17d 01' 14"}
MOON_DIST:       142.47 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.42, -0.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       95.93,-10.51 [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 an image 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 = 88.90,-4.48 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:10:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.815d {+12d 48' 54"} (J2000)
POINT_ROLL:      275.122d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29158.36 SOD {08:05:58.36} UT,   179.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.127
N_STARS:         170
X_OFFSET:        384 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1343 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00824063000msufc0179.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 31"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.91d {+20h 59m 38s}  -17.02d {-17d 00' 59"}
MOON_DIST:       142.44 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:10:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.815d {+12d 48' 54"} (J2000)
POINT_ROLL:      275.122d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29158.36 SOD {08:05:58.36} UT,   179.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.127
N_STARS:         170
X_OFFSET:        384 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1343 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00824063000msufc0179.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 31"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.91d {+20h 59m 39s}  -17.02d {-17d 00' 57"}
MOON_DIST:       142.44 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:12:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.815d {+12d 48' 54"} (J2000)
ROLL:            275.122d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29158.36 SOD {08:05:58.36} UT,   179.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     545040379
X_OFFSET:        864 [pixels]
Y_OFFSET:        777 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       937
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0200.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 33"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.93d {+20h 59m 42s}  -17.01d {-17d 00' 47"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:12:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.815d {+12d 48' 54"} (J2000)
ROLL:            275.122d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29158.36 SOD {08:05:58.36} UT,   179.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     545040379
X_OFFSET:        864 [pixels]
Y_OFFSET:        777 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       937
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0200.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 33"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.93d {+20h 59m 43s}  -17.01d {-17d 00' 45"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:14:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.971d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
POINT_ROLL:      275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29316.70 SOD {08:08:36.70} UT,   337.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.381
N_STARS:         104
X_OFFSET:        544 [pixels]
Y_OFFSET:        457 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1416 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00824063000msufc0337.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 35"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.95d {+20h 59m 48s}  -17.01d {-17d 00' 31"}
MOON_DIST:       142.41 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:14:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.971d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
POINT_ROLL:      275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29316.70 SOD {08:08:36.70} UT,   337.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.381
N_STARS:         104
X_OFFSET:        544 [pixels]
Y_OFFSET:        457 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1416 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00824063000msufc0337.fits
SUN_POSTN:        18.86d {+01h 15m 26s}   +7.98d {+07d 58' 35"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.95d {+20h 59m 48s}  -17.01d {-17d 00' 30"}
MOON_DIST:       142.40 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:16:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.971d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
ROLL:            275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29316.70 SOD {08:08:36.70} UT,   337.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     545040537
X_OFFSET:        864 [pixels]
Y_OFFSET:        777 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       937
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0358.fits
SUN_POSTN:        18.86d {+01h 15m 27s}   +7.98d {+07d 58' 36"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.96d {+20h 59m 51s}  -17.01d {-17d 00' 23"}
MOON_DIST:       142.40 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:16:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.971d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
ROLL:            275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29316.70 SOD {08:08:36.70} UT,   337.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     545040537
X_OFFSET:        864 [pixels]
Y_OFFSET:        777 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       937
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0358.fits
SUN_POSTN:        18.86d {+01h 15m 27s}   +7.98d {+07d 58' 37"}
SUN_DIST:         76.00 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      314.96d {+20h 59m 51s}  -17.01d {-17d 00' 22"}
MOON_DIST:       142.39 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:22:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
POINT_ROLL:      275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29849.17 SOD {08:17:29.17} UT,   869.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.108
N_STARS:         190
X_OFFSET:        304 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1743 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00824063000msufc0869.fits
SUN_POSTN:        18.86d {+01h 15m 28s}   +7.98d {+07d 58' 42"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      315.01d {+21h 00m 03s}  -17.00d {-16d 59' 47"}
MOON_DIST:       142.35 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:22:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
POINT_ROLL:      275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29849.17 SOD {08:17:29.17} UT,   869.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.108
N_STARS:         190
X_OFFSET:        304 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1743 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00824063000msufc0869.fits
SUN_POSTN:        18.87d {+01h 15m 28s}   +7.98d {+07d 58' 42"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      315.01d {+21h 00m 04s}  -17.00d {-16d 59' 46"}
MOON_DIST:       142.34 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:22:42 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     824063,   Seg_Num: 0
GRB_RA:           95.9569d {+06h 23m 49.65s} (J2000),
                  96.2140d {+06h 24m 51.36s} (current),
                  95.2533d {+06h 21m 00.79s} (1950)
GRB_DEC:         +12.8109d {+12d 48' 39.2"} (J2000),
                 +12.8001d {+12d 48' 00.4"} (current),
                 +12.8381d {+12d 50' 17.1"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29375.00 SOD {08:09:35.00} UT,   395.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        18.87d {+01h 15m 28s}   +7.98d {+07d 58' 43"}
SUN_DIST:         75.98 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      315.02d {+21h 00m 04s}  -17.00d {-16d 59' 44"}
MOON_DIST:       142.33 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.18 [deg] galactic lon,lat of the burst
ECL_COORDS:       95.91,-10.51 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 10 Apr 18 08:24:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
ROLL:            275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29849.17 SOD {08:17:29.17} UT,   869.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     545041069
X_OFFSET:        863 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0890.fits
SUN_POSTN:        18.87d {+01h 15m 28s}   +7.98d {+07d 58' 44"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      315.03d {+21h 00m 07s}  -16.99d {-16d 59' 36"}
MOON_DIST:       142.33 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [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 10 Apr 18 08:24:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     824063,   Seg_Num: 0
POINT_RA:         95.972d {+06h 23m 53s} (J2000)
POINT_DEC:       +12.817d {+12d 49' 02"} (J2000)
ROLL:            275.121d
IMG_START_DATE:  18218 TJD;   100 DOY;   18/04/10
IMG_START_TIME:  29849.17 SOD {08:17:29.17} UT,   869.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     545041069
X_OFFSET:        863 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00824063000msuni0890.fits
SUN_POSTN:        18.87d {+01h 15m 28s}   +7.98d {+07d 58' 44"}
SUN_DIST:         75.99 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      315.03d {+21h 00m 08s}  -16.99d {-16d 59' 34"}
MOON_DIST:       142.33 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      198.41, -0.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       95.92,-10.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #22620
J.D. Gropp (PSU), A. Deich (PSU), P. A. Evans (U Leicester), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
At 08:02:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180410A or a Galactic transient (trigger=824063). Swift slewed immediately to the source. The BAT on-board calculated location is RA, Dec 95.981, +12.808 which is
```
   RA(J2000) = 06h 23m 56s
   Dec(J2000) = +12d 48' 28"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure structure with a duration of about 100 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~26 sec after the trigger.
The XRT began observing the field at 08:05:49.8 UT, 170.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 95.9570, 12.8110 which is equivalent to:
```
   RA(J2000)  = 06h 23m 49.68s
   Dec(J2000) = +12d 48' 39.4"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 84 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.56 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 1.55e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 179 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 large, but uncertain, extinction expected.
Given the source's proximity (0.17 degrees) to the Galactic Plane, and the fact that this is a BAT image trigger, we cannot rule out that this may be a new Galactic Transient, rather than a GRB. If it is a transient, we name it Swift J0623.9+1248.
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 #22622
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1707 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180410A, 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 = 95.95717, +12.81143 which is equivalent to:
```
RA (J2000): 06h 23m 49.72s
Dec (J2000): +12d 48' 41.1"
```
with an uncertainty of 1.8 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 #22623
R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 180410A (J. D. Gropp et al., GCN Circular #22620) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2018-04-10 10:02:24 UT. We did not find any point source at the position of the XRT error circle (P. A. Evans et al., GCN Circular #22622) in all three bands. We obtained following limits for the magnitudes.
```
T0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~2.0           10:27:25       2,700         >18.8   >18.7   >18.0
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used UCAC-4 catalog for flux calibration.
GCN Circular #22627
F. E. Marshall (NASA/GSFC) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180410A 179 s after the BAT trigger (Gropp et al., GCN Circ. 22620). No optical afterglow consistent with the enhanced XRT position (Evans et al. GCN Circ. 22622) 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           179          329          147         >20.6
u_FC               338          587          246         >20.0
white              179         2068          450         >20.9
v                  669         1943          156         >19.2
b                  594         2043          156         >20.1
u                  338         2017          382         >20.4
w1                 718         1993          136         >20.1
m2                 693         1968          136         >20.3
w2                 644         2093          175         >19.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.92 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22628
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J. D. Gropp (PSU), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180410A (trigger #824063) (Gropp et al., GCN Circ. 22620). The BAT ground-calculated position is RA, Dec = 95.974, 12.804 deg which is
```
  RA(J2000)  =  06h 23m 53.7s
  Dec(J2000) = +12d 48' 15.2"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%.
The mask-weighted light curve shows a weak-long pulse that starts and peak at ~ T+25 s, and ends at ~T+150 s. T90 (15-350 keV) is 100.7 +- 13.8 sec (estimated error including systematics).
The time-averaged spectrum from T+25.16 to T+153.67 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.46 +- 0.13. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+25.70 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 spectral and temporal behaviors are consistent with those of a GRB. However, due to the proximity to the Galactic plane (0.17 degrees), we cannot rule out the possibility that this is a Galactic transient.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/824063/BA/
GCN Circular #22629
P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), Z. Liu (NAOC / U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU) and J.D. Gropp report on behalf of the Swift-XRT team:
We have analysed 6.8 ks of XRT data for GRB 180410A (Gropp et al. GCN Circ. 22620), from 176 s to 45.6 ks after the BAT trigger. The data comprise 201 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 22622).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.39 (+0.22, -0.28). At T+321 s the decay steepens to an alpha of 2.9 (+0.4, -0.3) before breaking again at T+866 s to a final decay with index alpha=1.48 (+0.15, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.87 (+0.07, -0.05). The best-fitting absorption column is consistent with the Galactic value of 6.6 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.45 (+0.21, -0.19) and a best-fitting absorption column of 7.7 (+2.3, -1.2) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 6.2 x 10^-11 (8.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.7 (+2.3, -1.2) x 10^21 cm^-2
Galactic foreground: 6.6 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.45 (+0.21, -0.19)
```
If the light curve continues to decay with a power-law decay index of 1.48, the count rate at T+24 hours will be 6.1 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.7 x 10^-14 (4.9 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00824063.
This circular is an official product of the Swift-XRT team.
GCN Circular #22631
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga= (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 180410A (Gropp et al., GCN 22620) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional = on Sierra San Pedro M=E1rtir from 2018/04 11.13 to 2018/04 11.25 UTC (19.10 to 21.87 hours after the BAT trigger), obtaining a total of 2.13 hours exposure in the r and i bands.
For a source within the Swift-XRT error circle, in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
 r	> 24.20
 i	> 23.90
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
The XRT error region is only 2.8 arcsec from a previously cataloged star with r =3D 18.1 and i =3D 17.4. Thus, our formal upper limits given above may be optimistic.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #22636
E. Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team:
"At 08:03:27.79 UT on 10 April 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180410A (trigger 545040212 / 180410336), which was also detected by the Swift/BAT (Gropp et al. 2018, GCN 22620, Lien et al., GCN 22628). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 108 degrees.
The GBM light curve consists of an initial peak followed by a weaker emission episode with a duration (T90) of about 100 s (50-300 keV). The time-averaged spectrum from T0-3 s to T0+47 s is adequately fit by a simple power law function with index -1.53 +/- 0.04.
The event fluence (10-1000 keV) in this time interval is (3.1 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-1.5 s in the 10-1000 keV band is 1.51 +/- 0.27 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

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Jochen Greiner, last update: 12-Apr-2018 [Disclaimer]