Gamma-ray Burst 140818B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:44:53 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     609885,   Seg_Num: 0
GRB_RA:          271.148d {+18h 04m 35s} (J2000),
                 271.337d {+18h 05m 21s} (current),
                 270.501d {+18h 02m 00s} (1950)
GRB_DEC:          -1.361d {-01d 21' 40"} (J2000),
                  -1.360d {-01d 21' 33"} (current),
                  -1.365d {-01d 21' 54"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8063 [cnts]    Image_Peak=223 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   473     E_range: 25-100 keV
BKG_INTEN:       82476 [cnts]
BKG_TIME:        67419.58 SOD {18:43:39.58} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16887 TJD;   230 DOY;   14/08/18
GRB_TIME:        67456.51 SOD {18:44:16.51} UT
GRB_PHI:          23.26 [deg]
GRB_THETA:        38.19 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     10.86 [sigma]
IMAGE_SIGNIF:    7.63 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +1 +53  +0 
SUN_POSTN:       148.00d {+09h 52m 00s}  +12.94d {+12d 56' 14"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.62d {+04h 38m 28s}  +18.20d {+18d 11' 53"}
MOON_DIST:       152.84 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.31,  9.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      271.24, 22.07 [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 = 41.95,11.36 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=430080258).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:44:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     430080258
GRB_RA:          254.667d {+16h 58m 40s} (J2000),
                 254.857d {+16h 59m 26s} (current),
                 254.016d {+16h 56m 04s} (1950)
GRB_DEC:          -2.183d {-02d 10' 59"} (J2000),
                  -2.205d {-02d 12' 16"} (current),
                  -2.108d {-02d 06' 28"} (1950)
GRB_ERROR:       26.50 [deg radius, statistical plus systematic]
GRB_INTEN:       44 [cnts/sec]
DATA_SIGNIF:     4.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16887 TJD;   230 DOY;   14/08/18
GRB_TIME:        67455.70 SOD {18:44:15.70} UT
GRB_PHI:         120.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.93
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   2%  SGR_1806n20
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN:       148.00d {+09h 52m 00s}  +12.94d {+12d 56' 14"}
SUN_DIST:        106.92 [deg]   Sun_angle= -7.1 [hr] (East of Sun)
MOON_POSTN:       69.62d {+04h 38m 28s}  +18.20d {+18d 11' 52"}
MOON_DIST:       163.20 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       17.13, 23.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      253.63, 20.39 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140818781/quicklook/glg_lc_medres34_bn140818781.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 48.87,24.33 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:45:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     430080258
GRB_RA:          269.580d {+17h 58m 19s} (J2000),
                 269.771d {+17h 59m 05s} (current),
                 268.927d {+17h 55m 42s} (1950)
GRB_DEC:          -2.620d {-02d 37' 11"} (J2000),
                  -2.620d {-02d 37' 13"} (current),
                  -2.616d {-02d 36' 58"} (1950)
GRB_ERROR:       13.20 [deg radius, statistical only]
DATA_SIGNIF:     7.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16887 TJD;   230 DOY;   14/08/18
GRB_TIME:        67455.70 SOD {18:44:15.70} UT
GRB_PHI:         148.00 [deg]
GRB_THETA:        32.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       148.00d {+09h 52m 00s}  +12.94d {+12d 56' 14"}
SUN_DIST:        121.52 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:       69.62d {+04h 38m 29s}  +18.20d {+18d 11' 54"}
MOON_DIST:       154.85 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       24.43, 10.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.55, 20.82 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140818781/quicklook/glg_lc_medres34_bn140818781.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=609885).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:46:14 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.149d {+18h 04m 36s} (J2000)
POINT_DEC:        -1.366d {-01d 21' 57"} (J2000)
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67565.69 SOD {18:46:05.69} UT,   109.2 [sec] since BAT Trigger Time
COUNTS:          2    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:     Mon 18 Aug 14 18:47:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     609885,   Seg_Num: 0
GRB_RA:          271.148d {+18h 04m 35s} (J2000),
                 271.337d {+18h 05m 21s} (current),
                 270.501d {+18h 02m 00s} (1950)
GRB_DEC:          -1.361d {-01d 21' 40"} (J2000),
                  -1.360d {-01d 21' 33"} (current),
                  -1.365d {-01d 21' 54"} (1950)
GRB_DATE:        16887 TJD;   230 DOY;   14/08/18
GRB_TIME:        67456.51 SOD {18:44:16.51} UT
TRIGGER_INDEX:   473
GRB_PHI:          23.26 [deg]
GRB_THETA:        38.19 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.86 [sigma]
IMAGE_SIGNIF:    7.63 [sigma]
LC_URL:          sw00609885000msb.lc
SUN_POSTN:       148.00d {+09h 52m 01s}  +12.94d {+12d 56' 12"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.65d {+04h 38m 35s}  +18.20d {+18d 12' 01"}
MOON_DIST:       152.86 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.31,  9.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      271.24, 22.07 [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 = 41.95,11.36 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:49:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.149d {+18h 04m 36s} (J2000)
POINT_DEC:        -1.366d {-01d 21' 58"} (J2000)
POINT_ROLL:      284.525d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67570.24 SOD {18:46:10.24} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.767
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        593 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1552 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00609885000msufc0113.fits
SUN_POSTN:       148.00d {+09h 52m 01s}  +12.94d {+12d 56' 11"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.66d {+04h 38m 38s}  +18.20d {+18d 12' 03"}
MOON_DIST:       152.87 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:49:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.149d {+18h 04m 36s} (J2000)
POINT_DEC:        -1.366d {-01d 21' 58"} (J2000)
POINT_ROLL:      284.525d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67570.24 SOD {18:46:10.24} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.767
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        593 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1552 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00609885000msufc0113.fits
SUN_POSTN:       148.00d {+09h 52m 01s}  +12.94d {+12d 56' 10"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.66d {+04h 38m 39s}  +18.20d {+18d 12' 05"}
MOON_DIST:       152.87 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 18:50:26 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     609885,   Seg_Num: 0
GRB_RA:          271.1365d {+18h 04m 32.76s} (J2000),
                 271.3259d {+18h 05m 18.21s} (current),
                 270.4892d {+18h 01m 57.41s} (1950)
GRB_DEC:          -1.3863d {-01d 23' 10.6"} (J2000),
                  -1.3845d {-01d 23' 04.3"} (current),
                  -1.3902d {-01d 23' 24.8"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67574.00 SOD {18:46:14.00} UT,   117.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       148.01d {+09h 52m 01s}  +12.94d {+12d 56' 10"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.67d {+04h 38m 40s}  +18.20d {+18d 12' 07"}
MOON_DIST:       152.90 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.28,  9.77 [deg] galactic lon,lat of the burst
ECL_COORDS:      271.23, 22.05 [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:     Mon 18 Aug 14 18:50:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.149d {+18h 04m 36s} (J2000)
POINT_DEC:        -1.366d {-01d 21' 58"} (J2000)
ROLL:            284.525d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67570.24 SOD {18:46:10.24} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     430080382
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0126.fits
SUN_POSTN:       148.01d {+09h 52m 01s}  +12.94d {+12d 56' 09"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.67d {+04h 38m 41s}  +18.20d {+18d 12' 08"}
MOON_DIST:       152.88 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 18:50:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.149d {+18h 04m 36s} (J2000)
POINT_DEC:        -1.366d {-01d 21' 58"} (J2000)
ROLL:            284.525d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67570.24 SOD {18:46:10.24} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     430080382
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0126.fits
SUN_POSTN:       148.01d {+09h 52m 01s}  +12.94d {+12d 56' 10"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.67d {+04h 38m 41s}  +18.20d {+18d 12' 07"}
MOON_DIST:       152.88 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 18:57:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.369d {-01d 22' 06"} (J2000)
POINT_ROLL:      284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67782.22 SOD {18:49:42.22} UT,   325.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.738
N_STARS:         123
X_OFFSET:        272 [pixels]
Y_OFFSET:        353 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1792 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00609885000msufc0325.fits
SUN_POSTN:       148.01d {+09h 52m 02s}  +12.93d {+12d 56' 04"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.73d {+04h 38m 56s}  +18.21d {+18d 12' 24"}
MOON_DIST:       152.92 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:58:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.369d {-01d 22' 06"} (J2000)
POINT_ROLL:      284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67782.22 SOD {18:49:42.22} UT,   325.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.738
N_STARS:         123
X_OFFSET:        272 [pixels]
Y_OFFSET:        353 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1792 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00609885000msufc0325.fits
SUN_POSTN:       148.01d {+09h 52m 02s}  +12.93d {+12d 56' 03"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.74d {+04h 38m 57s}  +18.21d {+18d 12' 25"}
MOON_DIST:       152.93 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 18:58:35 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     609885,   Seg_Num: 0
GRB_RA:          271.1354d {+18h 04m 32.49s} (J2000),
                 271.3248d {+18h 05m 17.95s} (current),
                 270.4881d {+18h 01m 57.15s} (1950)
GRB_DEC:          -1.3863d {-01d 23' 10.6"} (J2000),
                  -1.3846d {-01d 23' 04.3"} (current),
                  -1.3902d {-01d 23' 24.8"} (1950)
GRB_ERROR:       2.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67574.00 SOD {18:46:14.00} UT,   117.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       148.01d {+09h 52m 02s}  +12.93d {+12d 56' 03"}
SUN_DIST:        122.72 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.74d {+04h 38m 58s}  +18.21d {+18d 12' 26"}
MOON_DIST:       152.95 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.28,  9.77 [deg] galactic lon,lat of the burst
ECL_COORDS:      271.22, 22.05 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 18:59:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.369d {-01d 22' 06"} (J2000)
ROLL:            284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67782.22 SOD {18:49:42.22} UT,   325.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     430080594
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0338.fits
SUN_POSTN:       148.01d {+09h 52m 03s}  +12.93d {+12d 56' 02"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.75d {+04h 39m 00s}  +18.21d {+18d 12' 28"}
MOON_DIST:       152.94 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 18:59:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.369d {-01d 22' 06"} (J2000)
ROLL:            284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  67782.22 SOD {18:49:42.22} UT,   325.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     430080594
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0338.fits
SUN_POSTN:       148.01d {+09h 52m 03s}  +12.93d {+12d 56' 02"}
SUN_DIST:        122.73 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.75d {+04h 39m 00s}  +18.21d {+18d 12' 29"}
MOON_DIST:       152.94 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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 #16709
A. Vargas (PSU), D. N. Burrows (PSU), S. B. Cenko (GSFC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), L. M. Z. Hagen (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), J. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 18:44:16 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140818B (trigger=609885). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 271.148, -1.361 which is
```
 
   RA(J2000) = 18h 04m 35s 
   Dec(J2000) = -01d 21' 40" 
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 18:46:05.6 UT, 109.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 271.13656, -1.38660 which is equivalent to:
```
 
   RA(J2000)  = 18h 04m 32.77s 
   Dec(J2000) = -01d 23' 11.8" 
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 100 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 3.53 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 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 BAT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the expected extinction corresponding to E(B-V) of 0.71.
Burst Advocate for this burst is A. Vargas (avargas AT swift.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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 19:05:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.368d {-01d 22' 05"} (J2000)
POINT_ROLL:      284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  68335.46 SOD {18:58:55.46} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.845
N_STARS:         190
X_OFFSET:        272 [pixels]
Y_OFFSET:        353 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1792 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00609885000msufc0878.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 57"}
SUN_DIST:        122.72 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.81d {+04h 39m 14s}  +18.21d {+18d 12' 44"}
MOON_DIST:       152.98 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Aug 14 19:06:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.368d {-01d 22' 05"} (J2000)
POINT_ROLL:      284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  68335.46 SOD {18:58:55.46} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.845
N_STARS:         190
X_OFFSET:        272 [pixels]
Y_OFFSET:        353 [pixels]
X_MAX:           1711 [pixels]
Y_MAX:           1792 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00609885000msufc0878.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 57"}
SUN_DIST:        122.72 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.81d {+04h 39m 14s}  +18.21d {+18d 12' 45"}
MOON_DIST:       152.98 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 19:07:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.368d {-01d 22' 05"} (J2000)
ROLL:            284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  68335.46 SOD {18:58:55.46} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     430081147
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0891.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 56"}
SUN_DIST:        122.72 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.82d {+04h 39m 17s}  +18.21d {+18d 12' 48"}
MOON_DIST:       152.99 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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:     Mon 18 Aug 14 19:07:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     609885,   Seg_Num: 0
POINT_RA:        271.148d {+18h 04m 35s} (J2000)
POINT_DEC:        -1.368d {-01d 22' 05"} (J2000)
ROLL:            284.523d
IMG_START_DATE:  16887 TJD;   230 DOY;   14/08/18
IMG_START_TIME:  68335.46 SOD {18:58:55.46} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     430081147
X_OFFSET:        831 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00609885000msuni0891.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 56"}
SUN_DIST:        122.72 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:       69.82d {+04h 39m 18s}  +18.21d {+18d 12' 48"}
MOON_DIST:       152.99 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       26.30,  9.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      271.24, 22.07 [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 #16711
F.J. Aceituno (OSN/IAA-CSIC), J. Gorosabel (IAA-CSIC/UPV-EHU) and A.J. Castro-Tirado (IAA-CSIC/UMA), report on behalf of a larger collaboration:
We observed the field of GRB 140818B (Vargas et al., GCN 16709) with the 1.5m OSN telescope at Observatorio de Sierra Nevada (Spain). Several 300s images were acquired in the I- and R-band starting on Aug 18, 20:15 UT (i.e. 1.5 hours post burst). An optical source at the edge of the Swift/XRT error box is detected at coordinates (J2000) RA: 18 04 32.47, Dec: -01 23 09.8 (+/- 1"), which is not present in the corresponding DSS-2 image. A preliminary photometry against the USNO B1.0 catalog yields an I-band magnitude of 19.7 (Vega). At the moment we cannot determine if the source if fading in brightness. Further observations are encouraged.
GCN Circular #16712
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 990 s of XRT Photon Counting mode data and 2 UVOT images for GRB 140818B, 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 = 271.13556, -1.38629 which is equivalent to:
```
RA (J2000): 18h 04m 32.53s
Dec (J2000): -01d 23' 10.6"
```
with an uncertainty of 1.9 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 #16713
F. Knust, K. Varela, and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 140818B (Swift-60985; Vargas et al., GCN 16709) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008,PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 23:43 UT on 2014-08-18, 5 hours after the GRB trigger. They were performed at an average seeing of 1.23" and at an average airmass of 1.2.
Based on images with exposure times of 340s in g'r'i'z' and 370s in JHKs, we detect a source inside the 1.9' error circle reported by Beardmore et al. (GCN 16712) at
```
RA (J2000): 18h 04m 32.47s
Dec (J2000): -01d 23' 09.7"
```
with an uncertainty of 0.5" and magnitudes
```
g' > 24.1 mag,
r' = 22.1 +/- 0.1 mag,
i' = 21.8 +/- 0.1 mag,
z' = 21.4 +/- 0.1 mag.
J > 20.9 mag, 
H > 20.7 mag, and
K > 19.2 mag. 
```
The afterglow candidate reported by Aceituno et al. (GCN #16711) is also detected inside the 3.9? XRT error circle (GCN 16711) but not inside the 1.9' XRT error circle (GCN 16712) with magnitudes :
```
r' = 22.4 +/- 0.1 mag,
i' = 21.6 +/- 0.1 mag,
z' = 20.9 +/- 0.1 mag.
```
The given magnitudes are derived based on calibrating the images against the GROND zeropoints and 2MASS field stars are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.73 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16714
Eric Burns (UAH) reports on behalf of the Fermi GBM Team:
"At 18:44:15.70 UT on 18 August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140818B (trigger 430080258 / 140818781). which was also detected by the Swift/BAT (Burrows et al. 2014, GCN 16709). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 32 degrees.
The GBM light curve consists of one main peak followed by multiple smaller peaks with a duration (T90) of about 23.6 s (50-300 keV). The time-averaged spectrum from T0-6.14 s to T0+20.5 s is best fit by a simple power law function with index -1.7 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (1.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.26 s in the 10-1000 keV band is 1.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16716
B.P. Gompertz (U. Leicester), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and A. Vargas report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 140818B (Vargas et al. GCN Circ. 16709), from 94 s to 52.9 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 16712).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.64 (+/-0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+/-0.3). The best-fitting absorption column is 5.6 (+2.0, -1.6) x 10^21 cm^-2, in excess of the Galactic value of 3.5 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 3.6 x 10^-11 (7.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.6 (+2.0, -1.6) x 10^21 cm^-2
Galactic foreground: 3.5 x 10^21 cm^-2
Excess significance: 2.1 sigma
Photon index:	     2.3 (+/-0.3)
```
If the light curve continues to decay with a power-law decay index of 0.64, the count rate at T+24 hours will be 6.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-13 (4.6 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/00609885.
This circular is an official product of the Swift-XRT team.
GCN Circular #16717
L. M. Z. Hagen (PSU) and A. Vargas (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140818B 114 s after the BAT trigger (Vargas et al., GCN Circ. 16709). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 16712), the OSN candidate (Aceituno et al. GCN Circ 16711), or the GROND candidate (Knust et al. GCN Circ 16713) 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 early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white              113         5136          530         >21.32
v                  654         5546          254         >19.28
b                  581         4931          235         >20.11
u                  325         6007          506         >20.17
uvw1               704         5956          416         >19.92
uvm2              5551         5751          196         >19.53
uvw2               803         5341          235         >19.97
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.70 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16718
F. Knust, K. Varela, and J. Greiner (all MPE Garching) report on behalf of the GROND team:
The afterglow candidate reported in GCN 16713 is the same as the one reported by Aceituno et al. (GCN 16711) located at the edge of the 1.9 arcsec XRT error circle at:
```
RA (J2000): 18:04:32.47
Dec (J2000): -01:23:09.7
```
The GROND i'-band magnitude suggests it has decayed by about 2 magnitudes within 3.5 hours, thus confirming this source to be the afterglow of GRB 140818B.
The magnitudes of the second source reported correspond to a source at the edge of the 3.9 arcsec XRT error circle at :
```
RA (J2000): 18:04:32.78
Dec (J2000): -01:23:08.43
```
We apologize for this mistake.
GCN Circular #16721
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), 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 (LANL) A. Vargas (PSU) (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 140818B (trigger #609885) (Vargas, et al., GCN Circ. 16709). The BAT ground-calculated position is RA, Dec = 271.168, -1.354 deg which is
```
  RA(J2000)  =  18h 04m 40.2s
  Dec(J2000) = -01d 21' 14.3"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 39%.
The mask-weighted light curve shows a single-peaked structure starts at ~T-4 sec and peaks at ~ T+1 sec. The main pulse ends at ~T+2 sec, with some weak emission lasting till ~T+18 sec. T90 (15-350 keV) is 18.1 +- 5.0 sec (estimated error including systematics).
The time-averaged spectrum from T-3.5 to T+18.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.99 +- 0.25. The fluence in the 15-150 keV band is 5.4 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.31 sec in the 15-150 keV band is 1.1 +- 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/609885/BA/
GCN Circular #16728
A. Pozanenko (IKI), E. Romas (ISON), V. Nevskiy (ISON), G. Ohanian (Byurakan Astrophisical Observatory), H. Andreasyan (Byurakan Astrophisical Observatory), A. Volnova (IKI), I. Molotov (KIAM), report on behalf of larger collaboration:
We observed the field of GRB 140818B (Vargas et al., GCN 16709) with Santel-400AN telescope of ISON-Kislovodsk observatory starting on (UT) 18:54:36 and ISON-Burakan ORI-40 starting on (UT) 18:55:08. In the enhanced XRT position (Beardmore et al., GCN 16712) we do not detect optical afterglow candidate (Aceituno et al., GCN 16711; Knust et al., GCN 16713) neither in the first image nor in the stacked images. Preliminary photometry is based on nearby USNO-B1.0 stars, R2 magnitudes:
```
Date       UT start   t-T0    Filter   Exp.   UL(3 sigma) Observatory
                      (mid, days)        (s)

2014-08-18 18:54:36  0.0198   None    7*100   19.0        Kislovodsk

2014-08-18 18:55:08  0.0174   None    21*60   18.5        Burakan
```
GCN Circular #16748
S. Schmidl, S. Klose, D. A. Kann, U. Laux, L. Pfeifer, C. Pohl, and H. Meusinger (all TLS Tautenburg) report:
We observed the field of GRB 140818B (Swift trigger 609885, Vargas et al., GCN 16709) with the 1.34m Tautenburg Schmidt telescope.
Starting at 20:34 UT (1.83 hr after the trigger), we obtained in total 12 x 120s Rc-band images. Observations were obtained at a mean airmass of 1.75.
In a stack of all available images, we detect the source reported by Aceituno et al. (GCN 16711). Using USNO-B1 field stars for calibration, we derive a preliminary magnitude (Vega magnitude system) of
Rc = 20.9 +/- 0.2,
at a midtime of 2.08 hr after the burst.
The given magnitude is not corrected for the large Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.73 mag in the direction of the burst (Schlegel et al. 1998).

GCN Circular #16757
V.V. Golovnya (Main Astro Obs, Kyiv) report:
We have undertaken the review of the sky area in vicinity of=20 GRB140818B (Vargas et al., GCN 16709; Beardmore et al.,=20 GCN 16712) on astronegatives, collected in Ukrainian NAS=20 Main astronomical observatory plate archive (1976-1996).=20 All the plates with the possible object appearance are=20 digitized using Microtek ScanMaker 9800XL TMA and Epson Expression 10000X= L flatbed scanners and have been=20 placed into Golosiiv Plate Archive database DBGPA with open=20 access to them.=C2=A0The list of plates is given in the table:=20

yyyymmdd/TimeUT --Plates--  Exp.  LM  USNOA2 0825
19910613/222704 GUA040C001802A 22.5  15.9=C2=A0=C2=A0 -11812892
19910709/205250 GUA040C001826A 23.5  15.7=C2=A0=C2=A0 -11814106
19820715/175441 TAS040A000284  23.0  17.3 -11812584

No any object has been found in the point with the mentioned=20 coordinates of GRB. But the image of some object have=C2=A0found near GRB= position on the two of selected plates.=20 Brighness of the object is estimated as V=3D15.0 and V=3D16.5:=20

 Plates=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 RA,(J2000.0),Dec=C2=A0=C2==A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0V=20
GUA040C001802A 18:04:32.08 -01:22:57.0 15.0=20
TAS040A000284=C2=A0=C2=A0 =C2=A018:04:32.63 -01:22:55.6 16.5=20
Plates:
GUA040C=E2=80=93the plates archive identifier of DWA (D/F=3D400/2000,=20
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 M=3D103"/mm) of the Ukrainian NAS Main Astro obs.=20
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (Marsden's number - 83) 
the plate number [1].
TAS040A -the plates archive identifier of DAZ (D/F=3D400/3000,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 M=3D68.8"/mm) of the Tashkent Astro obs.=20
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (Marsden's number - 186)
 the plate number [1].
Exp.=C2=A0=C2=A0 - Duration of the maximum exposure (minutes).
LM - Limited V mag, derived in the 2,5 arcmin area around=20
 the location given in GCN Circ.16712:
RA(J2000): 18h 04m 32.53s, Dec(J2000): -01d 23' 10.6"=20
USNOA2 - Comparison star.

=C2=A0 The preview images of 3 areas together with=C2=A0=20 the 2,5x2,5 min.of arc area from SkyMap can be found in=C2=A0=20 http://gua.db.ukr-vo.org/img/grb/140818B/index.html=20 The images with full resolution are available via e-mail on=20 demand.
References:
1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0), http://gua.db.ukr-vo.org

GCN Circular #16780
A. Pozanenko (IKI), I. Rewa, W. Mundrzyjewski, A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 140818B (Vargas et al., GCN 16709)with Zeiss-1000 (East) telescope of Tien Shan Astronomical Observatory starting on Aug. 19, (UT) 17:05. We took several images in R-filter. Within enhanced XRT error circle (Beardmore et al., GCN 16712) we do not detect the afterlow (Aceituno et al., GCN 16711; Knust et al., GCN 16713). The source mentioned by Knust et al. (GCN 16713) is clearly visible in a stacked image in coordinates (J2000) 18:04:32.76 -01:23:08.9 (uncertainty is 0.2 arcsec in both coordinates) and has brightness of R=22.1+/-0.1.
Details of a photometry of the stacked image are following
```
Date       UT start  t-T0,d  Exp,s   Filter Up_Lim (3 sigma)
                     (mid)

2014-08-19 16:11:12  0.9317  20*600  R      22.9
```
The photometry is based on nearby USNO-B1.0 stars, R2 magnitudes.

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Jochen Greiner, last update: 05-Sep-2014 [Disclaimer]