Gamma-ray Burst 180805A

(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:     Sun 05 Aug 18 09:05:53 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     851829,   Seg_Num: 0
GRB_RA:          167.530d {+11h 10m 07s} (J2000),
                 167.746d {+11h 10m 59s} (current),
                 166.951d {+11h 07m 48s} (1950)
GRB_DEC:         -45.331d {-45d 19' 50"} (J2000),
                 -45.432d {-45d 25' 54"} (current),
                 -45.059d {-45d 03' 32"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3639 [cnts]    Image_Peak=154 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   439     E_range: 15-50 keV
BKG_INTEN:       23560 [cnts]
BKG_TIME:        32674.62 SOD {09:04:34.62} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18335 TJD;   217 DOY;   18/08/05
GRB_TIME:        32689.02 SOD {09:04:49.02} UT
GRB_PHI:         102.48 [deg]
GRB_THETA:        21.59 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.83 [sigma]
IMAGE_SIGNIF:    7.46 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +0 -36  +0 
SUN_POSTN:       135.38d {+09h 01m 31s}  +16.94d {+16d 56' 06"}
SUN_DIST:         68.93 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.44d {+03h 17m 47s}  +12.95d {+12d 56' 50"}
MOON_DIST:       118.94 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.88, 13.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      191.82,-45.47 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 11.28,-7.39 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Sun 05 Aug 18 09:06:26 UT 
NOTICE_TYPE:     Swift-XRT Nack-Position 
TRIGGER_NUM:     851829,   Seg_Num: 0 
POINT_RA:        167.523d {+11h 10m 06s} (J2000) 
POINT_DEC:       -45.303d {-45d 18' 09"} (J2000) 
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05 
IMG_START_TIME:  32775.13 SOD {09:06:15.13} UT,   86.1 [sec] since BAT Trigger \
Time 
COUNTS:          1    Min_needed= 20 
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec] 
PH2_ITER:        0    Max_iter_allowed= 4 
ERROR_CODE:      1 
COMMENTS:        SWIFT-XRT Nack Position.   
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:08:38 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     851829,   Seg_Num: 0
GRB_RA:          167.530d {+11h 10m 07s} (J2000),
                 167.746d {+11h 10m 59s} (current),
                 166.951d {+11h 07m 48s} (1950)
GRB_DEC:         -45.331d {-45d 19' 50"} (J2000),
                 -45.432d {-45d 25' 54"} (current),
                 -45.059d {-45d 03' 32"} (1950)
GRB_DATE:        18335 TJD;   217 DOY;   18/08/05
GRB_TIME:        32689.02 SOD {09:04:49.02} UT
TRIGGER_INDEX:   439
GRB_PHI:         102.48 [deg]
GRB_THETA:        21.59 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.83 [sigma]
IMAGE_SIGNIF:    7.46 [sigma]
LC_URL:          sw00851829000msb.lc
SUN_POSTN:       135.38d {+09h 01m 32s}  +16.93d {+16d 56' 04"}
SUN_DIST:         68.93 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.47d {+03h 17m 53s}  +12.95d {+12d 57' 16"}
MOON_DIST:       118.93 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.88, 13.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      191.82,-45.47 [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 = 11.28,-7.39 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:10:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.523d {+11h 10m 06s} (J2000)
POINT_DEC:       -45.303d {-45d 18' 08"} (J2000)
POINT_ROLL:      326.887d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32778.66 SOD {09:06:18.66} UT,   89.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.935
N_STARS:         116
X_OFFSET:        255 [pixels]
Y_OFFSET:        577 [pixels]
X_MAX:           1214 [pixels]
Y_MAX:           1536 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00851829000msufc0089.fits
SUN_POSTN:       135.38d {+09h 01m 32s}  +16.93d {+16d 56' 03"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.48d {+03h 17m 56s}  +12.96d {+12d 57' 31"}
MOON_DIST:       118.92 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.86, 13.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:10:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.523d {+11h 10m 06s} (J2000)
POINT_DEC:       -45.303d {-45d 18' 08"} (J2000)
POINT_ROLL:      326.887d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32778.66 SOD {09:06:18.66} UT,   89.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.935
N_STARS:         116
X_OFFSET:        255 [pixels]
Y_OFFSET:        577 [pixels]
X_MAX:           1214 [pixels]
Y_MAX:           1536 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00851829000msufc0089.fits
SUN_POSTN:       135.38d {+09h 01m 32s}  +16.93d {+16d 56' 03"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.49d {+03h 17m 57s}  +12.96d {+12d 57' 34"}
MOON_DIST:       118.92 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.86, 13.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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:     Sun 05 Aug 18 09:10:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     851829,   Seg_Num: 0
GRB_RA:          167.5646d {+11h 10m 15.50s} (J2000),
                 167.7804d {+11h 11m 07.30s} (current),
                 166.9858d {+11h 07m 56.59s} (1950)
GRB_DEC:         -45.3309d {-45d 19' 51.2"} (J2000),
                 -45.4320d {-45d 25' 55.2"} (current),
                 -45.0593d {-45d 03' 33.6"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32785.00 SOD {09:06:25.00} UT,   96.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       135.38d {+09h 01m 32s}  +16.93d {+16d 56' 03"}
SUN_DIST:         68.94 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.48d {+03h 17m 56s}  +12.96d {+12d 57' 32"}
MOON_DIST:       118.94 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.90, 13.97 [deg] galactic lon,lat of the burst
ECL_COORDS:      191.85,-45.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:13:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.523d {+11h 10m 06s} (J2000)
POINT_DEC:       -45.303d {-45d 18' 08"} (J2000)
ROLL:            326.887d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32778.66 SOD {09:06:18.66} UT,   89.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     555152800
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0111.fits
SUN_POSTN:       135.39d {+09h 01m 32s}  +16.93d {+16d 56' 01"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.51d {+03h 18m 03s}  +12.97d {+12d 58' 00"}
MOON_DIST:       118.91 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.86, 13.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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:     Sun 05 Aug 18 09:13:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.523d {+11h 10m 06s} (J2000)
POINT_DEC:       -45.303d {-45d 18' 08"} (J2000)
ROLL:            326.887d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32778.66 SOD {09:06:18.66} UT,   89.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     555152800
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0111.fits
SUN_POSTN:       135.39d {+09h 01m 32s}  +16.93d {+16d 56' 01"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.51d {+03h 18m 03s}  +12.97d {+12d 58' 03"}
MOON_DIST:       118.91 [deg]
MOON_ILLUM:      44 [%]
GAL_COORDS:      284.86, 13.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:19:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.300d {-45d 18' 01"} (J2000)
POINT_ROLL:      326.888d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32990.93 SOD {09:09:50.93} UT,   301.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.160
N_STARS:         161
X_OFFSET:        15 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1454 [pixels]
Y_MAX:           1776 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00851829000msufc0301.fits
SUN_POSTN:       135.39d {+09h 01m 33s}  +16.93d {+16d 55' 57"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.57d {+03h 18m 17s}  +12.98d {+12d 59' 01"}
MOON_DIST:       118.88 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:19:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.300d {-45d 18' 01"} (J2000)
POINT_ROLL:      326.888d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32990.93 SOD {09:09:50.93} UT,   301.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.160
N_STARS:         161
X_OFFSET:        15 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1454 [pixels]
Y_MAX:           1776 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00851829000msufc0301.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 57"}
SUN_DIST:         68.90 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.57d {+03h 18m 17s}  +12.98d {+12d 59' 04"}
MOON_DIST:       118.88 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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:     Sun 05 Aug 18 09:20:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.300d {-45d 18' 01"} (J2000)
ROLL:            326.888d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32990.93 SOD {09:09:50.93} UT,   301.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     555153012
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0323.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 56"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.58d {+03h 18m 20s}  +12.99d {+12d 59' 15"}
MOON_DIST:       118.87 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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:     Sun 05 Aug 18 09:21:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.300d {-45d 18' 01"} (J2000)
ROLL:            326.888d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32990.93 SOD {09:09:50.93} UT,   301.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     555153012
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0323.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 56"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.59d {+03h 18m 21s}  +12.99d {+12d 59' 18"}
MOON_DIST:       118.87 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:20:06 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     851829,   Seg_Num: 0
GRB_RA:          167.5646d {+11h 10m 15.50s} (J2000),
                 167.7804d {+11h 11m 07.30s} (current),
                 166.9858d {+11h 07m 56.59s} (1950)
GRB_DEC:         -45.3307d {-45d 19' 50.5"} (J2000),
                 -45.4318d {-45d 25' 54.5"} (current),
                 -45.0591d {-45d 03' 32.8"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  32785.00 SOD {09:06:25.00} UT,   96.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 56"}
SUN_DIST:         68.94 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.58d {+03h 18m 18s}  +12.99d {+12d 59' 07"}
MOON_DIST:       118.90 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.90, 13.97 [deg] galactic lon,lat of the burst
ECL_COORDS:      191.85,-45.46 [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 0.58% < P(seren) < 1.1%.

GCN Circular #23074
P. D'Avanzo (INAF-OAB), S. D. Barthelmy (GSFC), S. W. K Emery (UCL-MSSL), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), M. J. Moss (George Washington University) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 09:04:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180805A (trigger=851829). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 167.530, -45.331 which is
```
   RA(J2000) = 11h 10m 07s
   Dec(J2000) = -45d 19' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 1.5 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 09:06:15.1 UT, 86.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 167.5646, -45.3307 which is equivalent to:
```
   RA(J2000)  = 11h 10m 15.50s
   Dec(J2000) = -45d 19' 50.5"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 87 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.68 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 89 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 none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.19.
Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT brera.inaf.it). 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:25:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.301d {-45d 18' 02"} (J2000)
POINT_ROLL:      326.889d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  33568.68 SOD {09:19:28.68} UT,   879.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.444
N_STARS:         190
X_OFFSET:        15 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1454 [pixels]
Y_MAX:           1776 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00851829000msufc0879.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 53"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.63d {+03h 18m 30s}  +13.00d {+13d 00' 00"}
MOON_DIST:       118.85 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:25:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.301d {-45d 18' 02"} (J2000)
POINT_ROLL:      326.889d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  33568.68 SOD {09:19:28.68} UT,   879.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.444
N_STARS:         190
X_OFFSET:        15 [pixels]
Y_OFFSET:        337 [pixels]
X_MAX:           1454 [pixels]
Y_MAX:           1776 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00851829000msufc0879.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 52"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.63d {+03h 18m 31s}  +13.00d {+13d 00' 02"}
MOON_DIST:       118.85 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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:     Sun 05 Aug 18 09:26:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.301d {-45d 18' 02"} (J2000)
ROLL:            326.889d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  33568.68 SOD {09:19:28.68} UT,   879.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     555153590
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0901.fits
SUN_POSTN:       135.39d {+09h 01m 35s}  +16.93d {+16d 55' 52"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.63d {+03h 18m 32s}  +13.00d {+13d 00' 08"}
MOON_DIST:       118.85 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 Aug 18 09:26:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     851829,   Seg_Num: 0
POINT_RA:        167.522d {+11h 10m 05s} (J2000)
POINT_DEC:       -45.301d {-45d 18' 02"} (J2000)
ROLL:            326.889d
IMG_START_DATE:  18335 TJD;   217 DOY;   18/08/05
IMG_START_TIME:  33568.68 SOD {09:19:28.68} UT,   879.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     555153590
X_OFFSET:        574 [pixels]
Y_OFFSET:        896 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       734
Y_GRB_POS:       1056
BINNING_INDEX:   1
IM_URL:          sw00851829000msuni0901.fits
SUN_POSTN:       135.39d {+09h 01m 35s}  +16.93d {+16d 55' 52"}
SUN_DIST:         68.89 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:       49.63d {+03h 18m 32s}  +13.00d {+13d 00' 07"}
MOON_DIST:       118.85 [deg]
MOON_ILLUM:      43 [%]
GAL_COORDS:      284.86, 13.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      191.79,-45.45 [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 Circular #23075
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1075 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180805A, 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 = 167.56626, -45.33222 which is equivalent to:
```
RA (J2000): 11h 10m 15.90s
Dec (J2000): -45d 19' 56.0"
```
with an uncertainty of 2.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #23079
Paul Kuin (MSSL/UCL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180805A 90 s after the BAT trigger (D'Avanzo et al., GCN Circ. 23074). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 23075) 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            90          239          147         >19.8
u_FC               302          552          246         >19.5
white               90         1029          334         >20.6
v                  632         1080           58         >18.0
b                  558         1172           52         >19.1
u                  302         1153          285         >19.6
w1                 681         1129           58         >19.3
m2                 656         1104           39         >19.4
w2                 608         1055           58         >18.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.19 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #23081
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), 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 180805A (trigger #851829) (D'Avanzo et al., GCN Circ. 23074). The BAT ground-calculated position is RA, Dec = 167.575, -45.327 deg which is
```
  RA(J2000)  =  11h 10m 18.1s
  Dec(J2000) = -45d 19' 35.8"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
The mask-weighted light curve shows a single-pulse structure that starts at peaks at ~T0, and ends at ~T+1.9 s. T90 (15-350 keV) is 1.68 +- 0.41 sec (estimated error including systematics).
The time-averaged spectrum from T+0.04 to T+1.90 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.58 +- 0.32. The fluence in the 15-150 keV band is 1.1 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.13 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Both the temporal and spectral properties of this burst lie in the intermediate region between short and long GRBs. The lag analysis is unavailable due to the weakness of this burst. No extended emission is found.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/851829/BA/
GCN Circular #23084
J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU) and P. D'Avanzo report on behalf of the Swift-XRT team:
We have analysed 4.4 ks of XRT data for GRB 180805A (D'Avanzo et al. GCN Circ. 23074), from 93 s to 12.5 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 23075).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.32 (+/-0.14).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.50 (+0.54, -0.25). The best-fitting absorption column is consistent with the Galactic value of 1.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.7 (+/-2.2) x 10^21 cm^-2
Galactic foreground: 1.7 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.50 (+0.54, -0.25)
```
If the light curve continues to decay with a power-law decay index of 0.32, the count rate at T+24 hours will be 5.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.7 x 10^-13 (3.0 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/00851829.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 06-Aug-2018 [Disclaimer]