Gamma-ray Burst 140817A

(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 17 Aug 14 07:02:23 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     609736,   Seg_Num: 0
GRB_RA:          127.256d {+08h 29m 01s} (J2000),
                 127.547d {+08h 30m 11s} (current),
                 126.254d {+08h 25m 01s} (1950)
GRB_DEC:         +58.189d {+58d 11' 21"} (J2000),
                 +58.140d {+58d 08' 23"} (current),
                 +58.356d {+58d 21' 21"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9226 [cnts]    Image_Peak=1317 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       28046 [cnts]
BKG_TIME:        25307.59 SOD {07:01:47.59} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25321.35 SOD {07:02:01.35} UT
GRB_PHI:         -27.38 [deg]
GRB_THETA:        31.07 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     88.33 [sigma]
IMAGE_SIGNIF:    21.88 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +7  +0  +0 -68  +0 
SUN_POSTN:       146.62d {+09h 46m 28s}  +13.42d {+13d 24' 58"}
SUN_DIST:         46.97 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       49.99d {+03h 19m 58s}  +15.74d {+15d 44' 34"}
MOON_DIST:        70.13 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.09, 35.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      113.82, 37.79 [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 = 98.59,6.23 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=429951721).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:02:32 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     429951721
GRB_RA:          130.800d {+08h 43m 12s} (J2000),
                 131.104d {+08h 44m 25s} (current),
                 129.755d {+08h 39m 01s} (1950)
GRB_DEC:         +62.200d {+62d 12' 00"} (J2000),
                 +62.147d {+62d 08' 48"} (current),
                 +62.380d {+62d 22' 48"} (1950)
GRB_ERROR:       6.45 [deg radius, statistical plus systematic]
GRB_INTEN:       427 [cnts/sec]
DATA_SIGNIF:     22.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25318.19 SOD {07:01:58.19} UT
GRB_PHI:           7.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.75
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      69%  GRB
2nd_MOST_LIKELY:  29%  Distant Particles
DETECTORS:       0,0,1, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       146.62d {+09h 46m 28s}  +13.42d {+13d 24' 58"}
SUN_DIST:         49.98 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:       49.99d {+03h 19m 58s}  +15.74d {+15d 44' 35"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      153.86, 36.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      114.27, 42.16 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140817293/quicklook/glg_lc_medres34_bn140817293.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 59.90,-23.77 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=609736).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:02:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      43
TRIGGER_NUM:     429951721
GRB_RA:          163.783d {+10h 55m 08s} (J2000),
                 164.015d {+10h 56m 04s} (current),
                 162.985d {+10h 51m 56s} (1950)
GRB_DEC:         +63.133d {+63d 07' 60"} (J2000),
                 +63.055d {+63d 03' 18"} (current),
                 +63.400d {+63d 24' 00"} (1950)
GRB_ERROR:       24.10 [deg radius, statistical plus systematic]
GRB_INTEN:       114 [cnts/sec]
DATA_SIGNIF:     4.60 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25318.19 SOD {07:01:58.19} UT
GRB_PHI:         346.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.81
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      79%  GRB
2nd_MOST_LIKELY:  18%  Distant Particles
DETECTORS:       0,0,1, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       146.62d {+09h 46m 28s}  +13.42d {+13d 24' 58"}
SUN_DIST:         51.14 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       49.99d {+03h 19m 58s}  +15.74d {+15d 44' 35"}
MOON_DIST:        86.31 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      142.62, 49.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      132.68, 50.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140817293/quicklook/glg_lc_medres34_bn140817293.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 59.90,-23.77 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=609736).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:02:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     429951721
GRB_RA:          135.750d {+09h 03m 00s} (J2000),
                 135.993d {+09h 03m 58s} (current),
                 134.917d {+08h 59m 40s} (1950)
GRB_DEC:         +44.400d {+44d 23' 60"} (J2000),
                 +44.342d {+44d 20' 30"} (current),
                 +44.598d {+44d 35' 53"} (1950)
GRB_ERROR:       8.61 [deg radius, statistical only]
DATA_SIGNIF:     15.80 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25318.19 SOD {07:01:58.19} UT
GRB_PHI:           7.00 [deg]
GRB_THETA:       117.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       146.62d {+09h 46m 28s}  +13.42d {+13d 24' 58"}
SUN_DIST:         32.23 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
MOON_POSTN:       50.00d {+03h 19m 59s}  +15.74d {+15d 44' 37"}
MOON_DIST:        76.25 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      176.32, 41.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.82, 26.33 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140817293/quicklook/glg_lc_medres34_bn140817293.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=6720).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:03:13 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     429951721
GRB_RA:          134.460d {+08h 57m 50s} (J2000),
                 134.717d {+08h 58m 52s} (current),
                 133.577d {+08h 54m 18s} (1950)
GRB_DEC:         +50.370d {+50d 22' 12"} (J2000),
                 +50.313d {+50d 18' 46"} (current),
                 +50.563d {+50d 33' 48"} (1950)
GRB_ERROR:       3.03 [deg radius, statistical only]
DATA_SIGNIF:     31.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25318.19 SOD {07:01:58.19} UT
GRB_PHI:           7.00 [deg]
GRB_THETA:       123.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       146.62d {+09h 46m 28s}  +13.42d {+13d 24' 58"}
SUN_DIST:         38.15 [deg]   Sun_angle= 0.8 [hr] (West of Sun)
MOON_POSTN:       50.00d {+03h 20m 00s}  +15.74d {+15d 44' 39"}
MOON_DIST:        74.61 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      168.47, 40.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      121.68, 31.70 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140817293/quicklook/glg_lc_medres34_bn140817293.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=6720).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:04:07 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.249d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.160d {+58d 09' 35"} (J2000)
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25416.48 SOD {07:03:36.48} UT,   95.1 [sec] since BAT Trigger Time
COUNTS:          15    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    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 17 Aug 14 07:05:57 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     609736,   Seg_Num: 0
GRB_RA:          127.256d {+08h 29m 01s} (J2000),
                 127.547d {+08h 30m 11s} (current),
                 126.254d {+08h 25m 01s} (1950)
GRB_DEC:         +58.189d {+58d 11' 21"} (J2000),
                 +58.140d {+58d 08' 23"} (current),
                 +58.356d {+58d 21' 21"} (1950)
GRB_DATE:        16886 TJD;   229 DOY;   14/08/17
GRB_TIME:        25321.35 SOD {07:02:01.35} UT
TRIGGER_INDEX:   146
GRB_PHI:         -27.38 [deg]
GRB_THETA:        31.07 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     88.33 [sigma]
IMAGE_SIGNIF:    21.88 [sigma]
LC_URL:          sw00609736000msb.lc
SUN_POSTN:       146.62d {+09h 46m 29s}  +13.42d {+13d 24' 56"}
SUN_DIST:         46.98 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.02d {+03h 20m 06s}  +15.75d {+15d 44' 55"}
MOON_DIST:        70.11 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.09, 35.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      113.82, 37.79 [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 = 98.59,6.23 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:08:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.249d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 38"} (J2000)
POINT_ROLL:      153.877d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25422.30 SOD {07:03:42.30} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.065
N_STARS:         22
X_OFFSET:        268 [pixels]
Y_OFFSET:        543 [pixels]
X_MAX:           1227 [pixels]
Y_MAX:           1502 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00609736000msufc0100.fits
SUN_POSTN:       146.62d {+09h 46m 29s}  +13.41d {+13d 24' 54"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.04d {+03h 20m 10s}  +15.75d {+15d 45' 07"}
MOON_DIST:        70.09 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:08:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.249d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 38"} (J2000)
POINT_ROLL:      153.877d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25422.30 SOD {07:03:42.30} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.065
N_STARS:         22
X_OFFSET:        268 [pixels]
Y_OFFSET:        543 [pixels]
X_MAX:           1227 [pixels]
Y_MAX:           1502 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00609736000msufc0100.fits
SUN_POSTN:       146.62d {+09h 46m 29s}  +13.41d {+13d 24' 54"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.05d {+03h 20m 11s}  +15.75d {+15d 45' 09"}
MOON_DIST:        70.09 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:08:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.249d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 38"} (J2000)
ROLL:            153.877d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25422.30 SOD {07:03:42.30} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     429951834
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0113.fits
SUN_POSTN:       146.62d {+09h 46m 29s}  +13.41d {+13d 24' 53"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.05d {+03h 20m 12s}  +15.75d {+15d 45' 11"}
MOON_DIST:        70.08 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:16:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
POINT_ROLL:      153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25634.41 SOD {07:07:14.41} UT,   313.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.478
N_STARS:         36
X_OFFSET:        28 [pixels]
Y_OFFSET:        303 [pixels]
X_MAX:           1467 [pixels]
Y_MAX:           1742 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00609736000msufc0313.fits
SUN_POSTN:       146.63d {+09h 46m 30s}  +13.41d {+13d 24' 47"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.12d {+03h 20m 29s}  +15.77d {+15d 45' 55"}
MOON_DIST:        70.04 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:16:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
POINT_ROLL:      153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25634.41 SOD {07:07:14.41} UT,   313.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.478
N_STARS:         36
X_OFFSET:        28 [pixels]
Y_OFFSET:        303 [pixels]
X_MAX:           1467 [pixels]
Y_MAX:           1742 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00609736000msufc0313.fits
SUN_POSTN:       146.63d {+09h 46m 30s}  +13.41d {+13d 24' 47"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.12d {+03h 20m 29s}  +15.77d {+15d 45' 57"}
MOON_DIST:        70.04 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:17:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
ROLL:            153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25634.41 SOD {07:07:14.41} UT,   313.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     429952046
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0326.fits
SUN_POSTN:       146.63d {+09h 46m 30s}  +13.41d {+13d 24' 46"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.13d {+03h 20m 32s}  +15.77d {+15d 46' 03"}
MOON_DIST:        70.03 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:18:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
ROLL:            153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25634.41 SOD {07:07:14.41} UT,   313.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     429952046
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0326.fits
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 46"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.14d {+03h 20m 33s}  +15.77d {+15d 46' 06"}
MOON_DIST:        70.03 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:19:37 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     609736,   Seg_Num: 0
GRB_RA:          127.2661d {+08h 29m 03.86s} (J2000),
                 127.5576d {+08h 30m 13.83s} (current),
                 126.2649d {+08h 25m 03.56s} (1950)
GRB_DEC:         +58.1887d {+58d 11' 19.3"} (J2000),
                 +58.1392d {+58d 08' 21.2"} (current),
                 +58.3553d {+58d 21' 19.2"} (1950)
GRB_ERROR:       4.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26014.00 SOD {07:13:34.00} UT,   692.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 45"}
SUN_DIST:         46.98 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.15d {+03h 20m 36s}  +15.77d {+15d 46' 14"}
MOON_DIST:        70.03 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.09, 35.54 [deg] galactic lon,lat of the burst
ECL_COORDS:      113.82, 37.79 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:22:07 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
POINT_ROLL:      153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26189.02 SOD {07:16:29.02} UT,   867.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.531
N_STARS:         55
X_OFFSET:        28 [pixels]
Y_OFFSET:        303 [pixels]
X_MAX:           1467 [pixels]
Y_MAX:           1742 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00609736000msufc0867.fits
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 43"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.17d {+03h 20m 42s}  +15.77d {+15d 46' 28"}
MOON_DIST:        70.00 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 17 Aug 14 07:22:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
POINT_ROLL:      153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26189.02 SOD {07:16:29.02} UT,   867.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.531
N_STARS:         55
X_OFFSET:        28 [pixels]
Y_OFFSET:        303 [pixels]
X_MAX:           1467 [pixels]
Y_MAX:           1742 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00609736000msufc0867.fits
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 42"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.17d {+03h 20m 42s}  +15.77d {+15d 46' 29"}
MOON_DIST:        70.00 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:23:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
ROLL:            153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26189.02 SOD {07:16:29.02} UT,   867.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     429952601
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0880.fits
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 41"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.19d {+03h 20m 45s}  +15.78d {+15d 46' 37"}
MOON_DIST:        69.99 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 17 Aug 14 07:23:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.250d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 39"} (J2000)
ROLL:            153.880d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26189.02 SOD {07:16:29.02} UT,   867.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     429952601
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0880.fits
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 41"}
SUN_DIST:         46.96 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.19d {+03h 20m 45s}  +15.78d {+15d 46' 38"}
MOON_DIST:        69.99 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 #16695
B. Sbarufatti (INAF-OAB/PSU), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 07:02:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140817A (trigger=609736). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 127.256, +58.189 which is
```
   RA(J2000) = 08h 29m 01s
   Dec(J2000) = +58d 11' 21"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiply-peaked structure with a duration of about 30 sec. The peak count rate was ~16000 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 07:03:36.4 UT, 95.2 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 100 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 5% of the BAT 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 BAT 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 0.15.
Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti 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 17 Aug 14 07:23:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     609736,   Seg_Num: 0
GRB_RA:          127.2646d {+08h 29m 03.50s} (J2000),
                 127.5562d {+08h 30m 13.47s} (current),
                 126.2633d {+08h 25m 03.20s} (1950)
GRB_DEC:         +58.1901d {+58d 11' 24.3"} (J2000),
                 +58.1406d {+58d 08' 26.2"} (current),
                 +58.3567d {+58d 21' 24.2"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  26014.00 SOD {07:13:34.00} UT,   692.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       146.63d {+09h 46m 31s}  +13.41d {+13d 24' 42"}
SUN_DIST:         46.98 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.18d {+03h 20m 44s}  +15.78d {+15d 46' 36"}
MOON_DIST:        70.00 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.08, 35.54 [deg] galactic lon,lat of the burst
ECL_COORDS:      113.82, 37.79 [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:     Sun 17 Aug 14 07:08:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609736,   Seg_Num: 0
POINT_RA:        127.249d {+08h 29m 00s} (J2000)
POINT_DEC:       +58.161d {+58d 09' 38"} (J2000)
ROLL:            153.877d
IMG_START_DATE:  16886 TJD;   229 DOY;   14/08/17
IMG_START_TIME:  25422.30 SOD {07:03:42.30} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     429951834
X_OFFSET:        587 [pixels]
Y_OFFSET:        862 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       747
Y_GRB_POS:       1022
BINNING_INDEX:   1
IM_URL:          sw00609736000msuni0113.fits
SUN_POSTN:       146.62d {+09h 46m 29s}  +13.41d {+13d 24' 54"}
SUN_DIST:         46.95 [deg]   Sun_angle= 1.3 [hr] (West of Sun)
MOON_POSTN:       50.05d {+03h 20m 11s}  +15.75d {+15d 45' 09"}
MOON_DIST:        70.09 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      159.12, 35.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      113.82, 37.76 [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 #16696
B. Sbarufatti (INAF-OAB/PSU) reports on behalf of the Swift-XRT team
Using promptly downlinked data we find a bright, fading X-ray source with an enhanced position: RA,Dec = 127.2646, 58.1901 (degrees) which is equivalent to:
```
RA  (J2000.0) = 08 29 03.51
DEC (J2000.0) = +58 11 24.4
```
with an uncertainty of 2.2 arcsec (radius, 90% containment). This location is 16.8 arcseconds from the BAT onboard position, inside the BAT error circle.
GCN Circular #16697
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 448 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140817A, 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 = 127.26394, +58.19002 which is equivalent to:
```
 
RA (J2000): 08h 29m 3.35s 
Dec (J2000): +58d 11' 24.1" 
```
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 #16698
GRB 140817A Close to nearby galaxy
J. R. Cummings, K. L. Page (U Leicester) on behalf of the Swift science team:
We note the presence of a low-redshift galaxy in DSS, SDSS, 2MASS (SIMBAD) whose center is 98 arcseconds from the center of the Swift-XRT refined position error circle (Osborne, GCN Circ. # 16697), MCG+10-12-141 at z ~ 0.018368. The angular size of the galaxy is about 0.8 arcmin.
GCN Circular #16699
J. R. Cummings, S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140817A (trigger #609736) (Sbarufatti, et al., GCN Circ. 16695). The BAT ground-calculated position is RA, Dec = 127.244, 58.191 deg which is
```
    RA(J2000)  =  08h 28m 58.5s
    Dec(J2000) = +58d 11' 27.0"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.
The mask-weighted light curve shows multiple sharp peaks from T-20 to T+12 seconds, then a return to background levels until about T+170 seconds where 2 overlapping FRED peaks begin, lasting until about T+250 seconds. T90 (15-350 keV) is 244 +- 13 sec (estimated error including systematics).
The time-averaged spectrum from T-21.26 to T+270.27 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.08. The fluence in the 15-150 keV band is 4.6 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+2.64 sec in the 15-150 keV band is 7.2 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/609736/BA/
GCN Circular #16700
Oliver Roberts (UCD) and Charles Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 07:01:58.19 UT on the 17th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140817A (trigger 429951721 / 140817293), which was also detected by the BAT and XRT on Swift (Sbarufatti et al., Evans et al. and Cummings et al. 2014, GCNs 16695-99). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 124 degrees.
The GBM light curve consists of two bright peaks with a duration (T90) of about 16 s (50-300 keV). The time-averaged spectrum from T0-9 s to T0+16 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.64 +/- 0.19 and the cutoff energy, parameterised as Epeak, is 130 +/- 11 keV.
The event fluence (10-1000 keV) in this time interval is (5.03 +/- 0.04)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+5.8 s in the 10-1000 keV band is 10.6 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16701
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), J.P. Osborne (U. Leicester) and B. Sbarufatti report on behalf of the Swift-XRT team:
We have analysed 8.9 ks of XRT data for GRB 140817A (Sbarufatti et al. GCN Circ. 16695), from 79 s to 29.9 ks after the BAT trigger. The data comprise 590 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 enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 16697).
The late-time light curve (from T0+4.7 ks) can be modelled with a power-law decay with a decay index of alpha=0.86 (+/-0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.625 (+/-0.030). The best-fitting absorption column is 2.45 (+0.15, -0.14) x 10^21 cm^-2, in excess of the Galactic value of 8.0 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.79 (+0.11, -0.10) and a best-fitting absorption column of 2.3 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.3 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 8.0 x 10^20 cm^-2
Excess significance: 6.1 sigma
Photon index:	     1.79 (+0.11, -0.10)
```
If the light curve continues to decay with a power-law decay index of 0.86, the count rate at T+24 hours will be 0.033 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-12 (1.7 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00609736.
This circular is an official product of the Swift-XRT team.
GCN Circular #16704
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lyssenko, and T. Cline on behalf of the Konus-Wind team, report:
A long-duration GRB 140817A (Swift-BAT trigger 609736: Sbarufatti et al., GCN 16695; Cummings et al., GCN 16699; Fermi-GBM detection: Roberts & Meegan, GCN 16700) triggered Konus-Wind at T0=25319.509 s UT (07:01:59.509).
The light curve shows a double-peaked structure from ~T0-0.5 s to ~T0+3.5 s, the emission in this episode is visible up to ~8 MeV. The subsequent broad, weak, soft pulse is visible in the instrument's soft energy channel from ~T0+160 s to ~T0+270 s; it coincides in time with the bright X-ray flare in the XRT light curve (http://www.swift.ac.uk/xrt_products/00609736).
As observed by Konus-Wind, the burst had a fluence of 3.4(-0.3,+0.3)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+2.816 s, of 3.0(-0.3,+0.3)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.22 (-0.37,+0.40), the high energy photon index beta = -2.8 (-7.2,+0.4), the peak energy Ep = 118 (-18,+29) keV, chi2 = 84/84 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140817_T25319/
All the quoted errors are at the 95% confidence level. All the quoted values are preliminary.
GCN Circular #16710
F. E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140817A 101 s after the BAT trigger (Sbarufatti et al., GCN Circ. 16695). A fading source consistent with the UVOT-enhanced XRT position (Osborne et al. GCN Circ. 16697) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
  RA  (J2000) =  08:29:03.21 = 127.26336 (deg.)
  Dec (J2000) =  58:11:24.7  =  58.19020 (deg.)
```
with an estimated uncertainty of 0.53 arc sec. (radius, 90% confidence).
Preliminary detection and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              101         1017          334         20.3 +/- 0.17
white             5426        18414         1794        >21.6
v                  642         1068           58        >18.0
b                  568          762           39        >18.5
u                  313         4899          435        >20.5
w1                 692         1117           39        >19.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.15 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16729
A. Pozanenko (IKI), N. Tungalag (Research Center of Astronomy and Geophysics MAS), S. Schmalz (AIP), A. Volnova (IKI), I.Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 140817A (Sbarufatti et al., GCN 16695) with ORI-40 telescope of Khureltogot observatory. We started observation on Aug. 17 (UT) 14:20:48 and obtained 60 unfiltered images of 60 s exposure. Within enhanced XRT error circle (Osborne et al., GCN 16697) we do not detect any new object and in particular the afterglow candidate (Marshall et al., GCN 16710). Details of a photometry of the stacked image is following
```
Date       UT start   t-T0    Filter   Exp.   UL(3 sigma)
                      (mid, days)        (s)

2014-08-17 14:20:48  0.3269   None    60*60   18.2
```
The photometry is based on USNO-B1.0 star 1481-0233222 assuming R=15.43.
GCN Circular #16731
Daniele Malesani (DARK/NBI), Jyri Lehtinen (Univ. Helsinki), and Pall Jakobsson (Univ. Iceland), report on behalf of a larger collaboration:
We observed the field of GRB 140817A (Sbarufatti et al., GCN 16695) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera. Observations were carried out starting on 2014 Aug 20.23 UT (2.94 days after the GRB), at high airmass and in twilight, for a total exposure of 15 min.
No source is detected at the position of the UVOT optical afterglow (Marshall & Sbarufatti, GCN 16710) nor within the XRT error circle (Sbarufatti, GCN 16696; Osborne et al., GCN 16697) down to a 3-sigma limiting magnitude of R = 21 (calibrated against the USNO-B1.0 catalog).
The galaxy MCG +10-12-141 at z ~ 0.018, around 1 arcmin away of the XRT position, is well detected in our images (Cummings & Page, GCN 16698). We note that a supernova similar to SN 1998bw would have R ~ 17.5 at z = 0.018 at a comparable epoch. We thus disfavor the association of GRB 140817A with the nearby galaxy.

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Jochen Greiner, last update: 21-Aug-2014 [Disclaimer]