Gamma-ray Burst 070518

(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:     Fri 18 May 07 14:26:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.223d {+16h 56m 54s} (J2000),
                 254.261d {+16h 57m 03s} (current),
                 253.970d {+16h 55m 53s} (1950)
GRB_DEC:         +55.297d {+55d 17' 47"} (J2000),
                 +55.285d {+55d 17' 07"} (current),
                 +55.373d {+55d 22' 22"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5226 [cnts]    Image_Peak=197 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       34092 [cnts]
BKG_TIME:        51966.03 SOD {14:26:06.03} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14238 TJD;   138 DOY;   07/05/18
GRB_TIME:        51981.20 SOD {14:26:21.20} UT
GRB_PHI:         -56.39 [deg]
GRB_THETA:        18.83 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.20 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  +3  +0  +0 +23  +1 
SUN_POSTN:        55.00d {+03h 39m 59s}  +19.55d {+19d 33' 01"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.17d {+05h 24m 40s}  +28.15d {+28d 08' 44"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.48, 38.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.61, 76.46 [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 = 100.20,4.36 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:28:05 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.1979d {+16h 56m 47.4s} (J2000),
                 254.2354d {+16h 56m 56.4s} (current),
                 253.9445d {+16h 55m 46.6s} (1950)
GRB_DEC:         +55.2974d {+55d 17' 50.6"} (J2000),
                 +55.2862d {+55d 17' 10.4"} (current),
                 +55.3738d {+55d 22' 25.7"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52051.72 SOD {14:27:31.72} UT,   70.5 [sec] since BAT Trigger Time
CENTROID_X:      295.12,  raw= 295  [pixels]
CENTROID_Y:      327.58,  raw= 328  [pixels]
ROLL:            18.65 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   69.66
GRB_POS_XRT_Z:   -16.68
IMAGE_URL:       sw00279592000msxps_rw.img
SUN_POSTN:        55.00d {+03h 39m 59s}  +19.55d {+19d 33' 02"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.18d {+05h 24m 44s}  +28.15d {+28d 08' 47"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.49, 38.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.56, 76.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:28:00 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.1979d {+16h 56m 47.4s} (J2000),
                 254.2354d {+16h 56m 56.4s} (current),
                 253.9445d {+16h 55m 46.6s} (1950)
GRB_DEC:         +55.2974d {+55d 17' 50.6"} (J2000),
                 +55.2862d {+55d 17' 10.4"} (current),
                 +55.3738d {+55d 22' 25.7"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.81e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.47 [sigma]
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52051.72 SOD {14:27:31.72} UT,   70.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.18 261.46 243.41
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        55.00d {+03h 39m 59s}  +19.55d {+19d 33' 02"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.18d {+05h 24m 44s}  +28.15d {+28d 08' 47"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.49, 38.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.56, 76.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:28:01 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.1979d {+16h 56m 47.4s} (J2000),
                 254.2354d {+16h 56m 56.4s} (current),
                 253.9445d {+16h 55m 46.6s} (1950)
GRB_DEC:         +55.2974d {+55d 17' 50.6"} (J2000),
                 +55.2862d {+55d 17' 10.4"} (current),
                 +55.3738d {+55d 22' 25.7"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52051.72 SOD {14:27:31.72} UT,   70.5 [sec] since BAT Trigger Time
CENTROID_X:      295.12,  raw= 295  [pixels]
CENTROID_Y:      327.58,  raw= 328  [pixels]
ROLL:            18.65 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   69.66
GRB_POS_XRT_Z:   -16.68
IMAGE_URL:       sw00279592000msxps_rw.img
SUN_POSTN:        55.00d {+03h 39m 59s}  +19.55d {+19d 33' 02"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.18d {+05h 24m 44s}  +28.15d {+28d 08' 47"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.49, 38.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.56, 76.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:29:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.234d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.288d {+55d 17' 16"} (J2000)
POINT_ROLL:      18.651d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52062.07 SOD {14:27:42.07} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.922
N_STARS:         61
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0080.fits
SUN_POSTN:        55.00d {+03h 39m 60s}  +19.55d {+19d 33' 03"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.20d {+05h 24m 48s}  +28.15d {+28d 08' 50"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:30:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.234d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.288d {+55d 17' 16"} (J2000)
POINT_ROLL:      18.651d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52062.07 SOD {14:27:42.07} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.922
N_STARS:         61
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0080.fits
SUN_POSTN:        55.00d {+03h 39m 60s}  +19.55d {+19d 33' 03"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.21d {+05h 24m 50s}  +28.15d {+28d 08' 51"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.46 [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:     Fri 18 May 07 14:30:59 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.234d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.288d {+55d 17' 16"} (J2000)
ROLL:            18.651d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52062.07 SOD {14:27:42.07} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201191264
X_OFFSET:        753 [pixels]
Y_OFFSET:        717 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       913
Y_GRB_POS:       877
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0080.fits
SUN_POSTN:        55.00d {+03h 39m 60s}  +19.55d {+19d 33' 04"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.22d {+05h 24m 52s}  +28.15d {+28d 08' 52"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:31:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.223d {+16h 56m 54s} (J2000),
                 254.261d {+16h 57m 03s} (current),
                 253.970d {+16h 55m 53s} (1950)
GRB_DEC:         +55.297d {+55d 17' 47"} (J2000),
                 +55.285d {+55d 17' 07"} (current),
                 +55.373d {+55d 22' 22"} (1950)
GRB_DATE:        14238 TJD;   138 DOY;   07/05/18
GRB_TIME:        51981.20 SOD {14:26:21.20} UT
TRIGGER_INDEX:   137
GRB_PHI:         -56.39 [deg]
GRB_THETA:        18.83 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.20 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
LC_URL:          sw00279592000msb.lc
SUN_POSTN:        55.00d {+03h 39m 60s}  +19.55d {+19d 33' 04"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.22d {+05h 24m 52s}  +28.15d {+28d 08' 52"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.48, 38.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.61, 76.46 [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 = 100.20,4.36 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:31:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.234d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.288d {+55d 17' 16"} (J2000)
ROLL:            18.651d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52062.07 SOD {14:27:42.07} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201191264
X_OFFSET:        753 [pixels]
Y_OFFSET:        717 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       913
Y_GRB_POS:       877
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0080.fits
SUN_POSTN:        55.00d {+03h 39m 60s}  +19.55d {+19d 33' 04"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.22d {+05h 24m 53s}  +28.15d {+28d 08' 53"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:38:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52167.92 SOD {14:29:27.92} UT,   186.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.846
N_STARS:         62
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0186.fits
SUN_POSTN:        55.00d {+03h 40m 01s}  +19.55d {+19d 33' 08"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.31d {+05h 25m 13s}  +28.15d {+28d 09' 06"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:39:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52167.92 SOD {14:29:27.92} UT,   186.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.846
N_STARS:         62
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0186.fits
SUN_POSTN:        55.00d {+03h 40m 01s}  +19.55d {+19d 33' 08"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.31d {+05h 25m 14s}  +28.15d {+28d 09' 06"}
MOON_DIST:        96.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:40:02 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52167.92 SOD {14:29:27.92} UT,   186.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201191369
X_OFFSET:        753 [pixels]
Y_OFFSET:        717 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       913
Y_GRB_POS:       877
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0186.fits
SUN_POSTN:        55.01d {+03h 40m 01s}  +19.55d {+19d 33' 09"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.32d {+05h 25m 16s}  +28.15d {+28d 09' 08"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:40:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52167.92 SOD {14:29:27.92} UT,   186.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201191369
X_OFFSET:        753 [pixels]
Y_OFFSET:        717 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       913
Y_GRB_POS:       877
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0186.fits
SUN_POSTN:        55.01d {+03h 40m 01s}  +19.55d {+19d 33' 09"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.32d {+05h 25m 17s}  +28.15d {+28d 09' 08"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:43:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52853.61 SOD {14:40:53.61} UT,   872.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.947
N_STARS:         61
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0872.fits
SUN_POSTN:        55.01d {+03h 40m 02s}  +19.55d {+19d 33' 11"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.36d {+05h 25m 27s}  +28.15d {+28d 09' 14"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:44:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52853.61 SOD {14:40:53.61} UT,   872.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.947
N_STARS:         61
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0872.fits
SUN_POSTN:        55.01d {+03h 40m 02s}  +19.55d {+19d 33' 11"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.37d {+05h 25m 28s}  +28.15d {+28d 09' 15"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:45:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52853.61 SOD {14:40:53.61} UT,   872.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201192055
X_OFFSET:        752 [pixels]
Y_OFFSET:        716 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       912
Y_GRB_POS:       876
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0872.fits
SUN_POSTN:        55.01d {+03h 40m 02s}  +19.55d {+19d 33' 11"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.38d {+05h 25m 30s}  +28.15d {+28d 09' 16"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:45:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.232d {+16h 56m 56s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52853.61 SOD {14:40:53.61} UT,   872.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201192055
X_OFFSET:        752 [pixels]
Y_OFFSET:        716 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       912
Y_GRB_POS:       876
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0872.fits
SUN_POSTN:        55.01d {+03h 40m 02s}  +19.55d {+19d 33' 12"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.38d {+05h 25m 31s}  +28.15d {+28d 09' 17"}
MOON_DIST:        96.35 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:48:09 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.1992d {+16h 56m 47.8s} (J2000),
                 254.2367d {+16h 56m 56.7s} (current),
                 253.9458d {+16h 55m 46.9s} (1950)
GRB_DEC:         +55.2946d {+55d 17' 40.5"} (J2000),
                 +55.2834d {+55d 17' 00.3"} (current),
                 +55.3710d {+55d 22' 15.6"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.81e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.50 [sigma]
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52051.72 SOD {14:27:31.72} UT,   70.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 13"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.41d {+05h 25m 39s}  +28.16d {+28d 09' 21"}
MOON_DIST:        96.33 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.48, 38.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.56, 76.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:49:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.231d {+16h 56m 55s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52959.29 SOD {14:42:39.29} UT,   978.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.894
N_STARS:         66
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0978.fits
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 14"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.43d {+05h 25m 43s}  +28.16d {+28d 09' 24"}
MOON_DIST:        96.34 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:49:39 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     279592,   Seg_Num: 0
GRB_RA:          254.1985d {+16h 56m 47.63s} (J2000),
                 254.2360d {+16h 56m 56.63s} (current),
                 253.9451d {+16h 55m 46.82s} (1950)
GRB_DEC:         +55.2950d {+55d 17' 42.0"} (J2000),
                 +55.2838d {+55d 17' 01.7"} (current),
                 +55.3714d {+55d 22' 17.0"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         18.00 +/- 1.00 [mag]
FILTER:          10, White
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52063.00 SOD {14:27:43.00} UT,   81.8 [sec] since BAT Trigger Time
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 14"}
SUN_DIST:        103.39 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.43d {+05h 25m 43s}  +28.16d {+28d 09' 24"}
MOON_DIST:        96.33 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.48, 38.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.56, 76.45 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 18 May 07 14:50:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.231d {+16h 56m 55s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
POINT_ROLL:      18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52959.29 SOD {14:42:39.29} UT,   978.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.894
N_STARS:         66
X_OFFSET:        433 [pixels]
Y_OFFSET:        397 [pixels]
X_MAX:           1392 [pixels]
Y_MAX:           1356 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00279592000msufc0978.fits
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 14"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.43d {+05h 25m 44s}  +28.16d {+28d 09' 25"}
MOON_DIST:        96.34 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:50:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.231d {+16h 56m 55s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52959.29 SOD {14:42:39.29} UT,   978.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201192161
X_OFFSET:        752 [pixels]
Y_OFFSET:        716 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       912
Y_GRB_POS:       876
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0978.fits
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 15"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.44d {+05h 25m 46s}  +28.16d {+28d 09' 26"}
MOON_DIST:        96.34 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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:     Fri 18 May 07 14:51:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279592,   Seg_Num: 0
POINT_RA:        254.231d {+16h 56m 55s} (J2000)
POINT_DEC:       +55.285d {+55d 17' 07"} (J2000)
ROLL:            18.653d
IMG_START_DATE:  14238 TJD;   138 DOY;   07/05/18
IMG_START_TIME:  52959.29 SOD {14:42:39.29} UT,   978.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201192161
X_OFFSET:        752 [pixels]
Y_OFFSET:        716 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       912
Y_GRB_POS:       876
BINNING_INDEX:   1
IM_URL:          sw00279592000msuni0978.fits
SUN_POSTN:        55.01d {+03h 40m 03s}  +19.55d {+19d 33' 15"}
SUN_DIST:        103.40 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       81.44d {+05h 25m 47s}  +28.16d {+28d 09' 27"}
MOON_DIST:        96.34 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       83.47, 38.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.65, 76.45 [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 Circular #6415
C. Guidorzi (Univ Bicocca&INAF-OAB), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. Campana (INAF-OAB), M. M. Chester (PSU), G. Cusumano (INAF-IASFPA), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/GSFC/USRA), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), F. E. Marshall (NASA/GSFC), A. Moretti (INAF-OAB), P. T. O'Brien (U Leicester), D. M. Palmer (LANL), J. L. Racusin (PSU), P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (NASA/ORAU), G. Sato (GSFC/ISAS), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA), D. E. Vanden Berk (PSU) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team:
At 14:26:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070518 (trigger=279592). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 254.223, +55.297 which is
```
   RA(J2000) = 16h 56m 54s   
   Dec(J2000) = +55d 17'47"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single (FRED-like) peak with a duration of about 7 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 14:27:31 UT, 70 seconds after the BAT trigger. XRT found a variable, uncatalogued X-ray source located at RA, Dec 254.1979, +55.2974 which is
```
   RA(J2000)  =  16h 56m 47.5s
   Dec(J2000) =  55d 17' 42.5"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 52 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 5.8e-10 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 82 seconds after the BAT trigger. We see a fading afterglow located at RA, Dec 254.1986, 55.2951 which is
```
  RA(J2000) = 16h 56m 47.7s   
  Dec(J2000) = 55d 17' 42.3" 
```
with an uncertainty of 1 arcsecond (radius, 90% containment) with an estimated magnitude of 18. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
GCN Circular #6416
L.P. Xin, M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, Y. Urata, and W.K. Zheng on behalf of EAFON report:
We have imaged the field of GRB 070518 (C. Guidorzi et al., GCN 6415) with the TNT 0.8m and EST 1m telescope at Xinglong Observatory started from 14:34:53 UT, 512s after the burst. Observation were performed with White, R, V and I filter, we estimate the OT has faded to ~ R=19.84 derieved form USNO A-2.0, 32.73 minutes after the burst Observation is still undergoing, deep observation are encouraged.
This message may be cited.
GCN Circular #6417
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070518 (trigger #279592) (Guidorzi, et al., GCN Circ. 6415). The BAT ground-calculated position is RA, Dec = 254.221, 55.285 deg which is
```
   RA(J2000)  = 16h 56m 52.9s 
   Dec(J2000) = 55d 17'  5.6" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%.
The mask-weighted lightcurves shows a single peak starting a ~T-5 sec and ending at ~T+10 sec. T90 (15-350 keV) is 5.5 +- 0.2 sec (estimated error including systematics).
The time-averaged spectrum from T-1.8 to T+4.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.11 +- 0.25. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.12 sec in the 15-150 keV band is 0.7 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6418
Martin Jelinek, Alberto J. Castro-Tirado, Victor Casanova, Javier Gorosabel, Antonio de Ugarte Postigo, Stanislav Vitek, Ronan Cunniffe and Petr Kubanek (IAA CSIC Granada, Spain)
report
We observed the optical afterglow of GRB070518 (Guidorzi et al, GCN6415) with a 1.5m telescope at Observatorio Sierra Nevada using R and I-band filters. The afterglow is found to have R~22.2, relatively to the nearby USNO-A2.0 (R_usno=18.7) on a 60-minute combined image with exposure mean time 23:04UT (i.e. 8.6h after the GRB).
This message may be cited
GCN Circular #6419
Cucchiara A. (PSU), Marshall F. E. (NASA/GSFC) and Guidorzi C. (Univ. Bicocca&INAF-OAB) reports on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB070518 starting 82 sec after the trigger (Guidorzi et al., GCN Circ. 6415). The afterglow was clearly detected in all the 7 filters. This suggest a redshift lower than 0.7.
The estimated magnitude for the V and White filters are:
```
Filter        T_start(sec)     Exposure(sec)         Mag

White            82                 93            18.16 +/- 0.06
White           873                 94            19.14 +/- 0.09
White          5517                191            20.08 +/- 0.14
White          6951                191            21.33 +/- 0.20

V               187                391            19.31 +/- 0.13
V               978                391            20.08 +/- 0.24
V              5927                363            21.05 +/- 0.48
```
Assuming a single power-low, the decay index is ~1.17 in V band. The extrapolated V mag at T+10h is 22.59.
The values quoted above are not corrected for the expected Galactic extinction of E_{B-V} = 0.017 mag (Schlegel et al. 1998).
GCN Circular #6421
C. Guidorzi, P. Romano (Univ Bicocca&INAF-OAB), A. Moretti (INAF-OAB), S.D. Vergani (DIAS-DCU) report on behalf of the Swift team:
We have analysed the first two orbits of GRB 070518 (Guidorzi et al., GCN Circ. 6415) with total observing times of 186 s in Windowed Timing mode and 4.2 ks in Photon Counting mode in the Swift XRT. The Photon Counting mode image provides a refined XRT position at RA,DEC(J200) =3D 254.19800, +55.29444 which is
```
RA(J2000)  =3D 16h 56m 47.52s
Dec(J2000) =3D +55d 17' 40.0"
```
with an uncertainty of 3.9 arcsec (radius, 90% containment). This is 2.5 arcsec from the initial X-ray position, 2.8 arcsec from the UVOT position (GCN Circ. 6415) and 57 arcsec from the BAT refined position (Krimm et al., GCN Circ. 6417).
The XRT light curve exhibits an initial flaring behaviour up to ~T+200 s, after which a steep decay (4.7 =B1 0.4) follows after the last flare, with a break at T+460 (+/- 40) s to a shallower decay (1.11 =B1 0.13) up to T+11ks.
We extracted two spectra from the WT data during the flaring activity, due to a strong spectral evolution. The first spectrum, from 77 s to 158 s, can be fit with an absorbed power law with a photon index of 2.3+/-0.1 and column density of (9.6+/-1.6)E20 cm^-2 significantly in excess of the Galactic value (2.2E20 cm^-2; Dickey & Lockman, 1990). The second spectrum, from 165 to 253 s, has a photon index of 2.9+/-0.1 and same column density as that of the first spectrum.
The absorbed (unabsorbed) 0.3-10.0keV flux for the first spectrum is 5.1E-10 (7.2E-10) ergs cm^-2 s^-1.
Assuming the source continues to decay at the same rate, we predict an XRT count rate of 6.3E-4 counts/s at T+24 hours, which corresponds to an observed (unabsorbed) flux of 2.0E-14 (2.8E-14) ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT team.
GCN Circular #6422
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 070518 (GCN 6415) at a frequency of 8.46 GHz on 2007 May 19th at 7.41 UT, around 17 hours after the burst. The radio afterglow of the GRB is undetected at the SWIFT-XRT position (GCN 6421). The 2-sigma uppler limit on the GRB flux density is 64 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Report 57.1
GCN_Report 57.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_57_1.pdf by C. Guidorzi at U.Bicocca/INAF-OAB titled: "Swift observations of GRB 070518"
GCN Circular #6426
S. Covino, G. Tagliaferri, G. Chincarini (INAF/OABr), L.A. Antonelli, G.L. Israel (INAF/Rome), G. Andreuzzi, A. Garcia de Gurtubai Escudero (INAF/TNG) on behalf of the CIBO collaboration, report:
We observed the field of GRB070518 (GCN 6415, Guidorzi et al.) with the Italian Telescopio Nazionale Galileo (TNG) equipped with Dolores in the R band at about 10 and 35 hours from the burst. We clearly detected the optical afterglow (GCN 6415, Guidorzi et al.; GCN 6418, Jelinek et al.; GCN 6419, Cucchiara et al.).
At about 35 hours from the burst the afterglow magnitude was R ~ 23.3. The decay index between the two epochs was about 0.5, significantly shallower than what reported at earlier times by Cucchiara et al. (GCN 6419). At about 2.5 arcsec NE of the afterglow we also detect a fainter source with no evidence of extended emission.
Further observations are in progress.
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GCN Circular #6443
P.A. Price (IfA, Hawaii) and T. Minezaki (IoA, Tokyo) report on behalf of a larger collaboration:
We observed the optical afterglow of GRB070518 with the MAGNUM telescope + MIPS dual-beam camera. Observations commenced 10.6 minutes after the trigger, with a mid-point time of 2007 May 18.614 UTC. Based on calibration using a single USNO star (optical image; as for GCN #6418) and single 2MASS star (NIR image), we find:
```
	R ~ 19.5 mag
	J ~ 18.8 mag
```
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GCN Circular #6458
F. Terra (Second University of Roma "Tor Vergata"), G. Greco, C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), G. Pizzichini (INAF/IASF Bologna), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), S. Karpov (Special Astrophysical Observatory, Russia), S. Galetti and R. Gualandi (Bologna Observatory) report:
During the night of 07/05/18 we observed the OT of GRB070518 (Guidorzi et al., GCN 6415) with the 1.52 cm telescope of the Bologna Observatory in Loiano under moderate sky conditions (seeing ~ 2"). The OT flux was slightly blended with a nearby star (R ~ 18.7). To correct for the blending we employed difference image analysis techniques.
By adding two consecutive 30 min exposures in the Rc filter at mean time 23.5 UT we find Rc = 22.3 +/- 0.2 based on the USNO-A2.0 catalog.
Our coadded image have been posted in our public directory from where they can be retrieved by sftp using
```
hostname: ermione.bo.astro.it
username: publicGRB
password: GRB_bo.
```
GCN Circular #6461
H. Swan (U Mich), I. Smith (Rice), C. Akerlof (U Mich), and M. Skinner (Boeing) report on behalf of the MARGE collaboration:
The AEOS Burst Camera (ABC) on the AEOS telescope, located at the Maui Space Surveillance System on Haleakala, observed the fading counterpart to GRB070518 (Swift trigger 279592(GCN 6415)). The images are unfiltered 10s exposures which started at 14:55:49 UT (~29 minutes after the trigger) and ended at 15:04:00 UT.
After coadding our images in sets of 5, we detect the OT first identified by C. Guidorzi et al (GCN 6415). A preliminary analysis gives a magnitude of approximately 20.0 +/-0.1 at a mid time of 14:56:32 UT. We calibrated the OT to the USNO-A2.0 R band magnitude of the nearby 18.7 mag star located at (J2000) RA = 16:56:47.4373, DEC = +55:17:45.610. Our observations are consistent with the other optical observations. Using our data, and the optical data from P. A. Price and T. Minezaki (GCN 6443), L. P. Xin et al. (GCN 6416), M. Jelinek et al. (GCN 6418), F. Terra et al. (GCN 6458), and S. Covino et al. (GCN 6426), we find that the OT has a power-law decay index of 0.74.
GCN Circular #6462
P. Garnavich (Notre Dame), N. Bouche, P. Buschkamp (MPE), O. Kuhn (LBTO/UAz), X. Fan, (U Ariz), X. Dai, J. Prieto, K. Z. Stanek (Ohio State), J. Hill (LBTO/UAz), J. Bechtold, J. Kern (U Ariz), R. M. Wagner (LBTO/OSU), J. Rhoads (Ariz State) report:
The Large Binocular Telescope (LBT) imaged the position of the GRB 070518 afterglow (Guidorzi et al, GCN 6415; Xin et al. GCN 6416) with the LBC-blue CCD camera (http//lbc.mporzio.astro.it) and 8.4-m SX mirror on three epochs beginning 2007 May 19.32 (UT) (17.2 hours after the burst). A fading source is clearly detected at the position of the afterglow at all three epochs. Assuming the USNO-B.1 star at 16:56:47.39 +55:17:45.8 (J2000) has an R2=19.12 mag, we estimate the total brightness of the source (shown in the table below) using a 1.3" radius aperture.
```
 UT Date   Age (hr)   Exposures    Seeing    R2 mag  Error
-----------------------------------------------------------
May 19.32   17.2       5x200s      0.75"    23.03   0.05
May 20.31   41.0       5x200s      1.0"     23.36   0.05
May 22.21   86.4      15x200s      1.1"     23.56   0.05
```
The slow fading implies significant contribution from a host galaxy, and in good seeing the source appears elongated to the southwest.
Combining observations from Price et al. (GCN 6443), Covino et al. (GCN 6426) and Jelinek et al. (GCN 6418, corrected to USNO-B.1 catalog) with the LBT estimates shows that a single power-law decline with index 0.95+/-0.05 added to a host galaxy of R=23.8+/-0.1 mag fits all the observations spanning 10 minutes to 100 hours after the burst.
The May 19 LBT image can be found at: http://www.nd.edu/~pgarnavi/grb070518/grb070518_LBT.jpg
```
The LBT is an international collaboration among institutions in the
United States, Italy and Germany. The LBT Corporation partners are:
*  The University of Arizona on behalf of the Arizona university system
*  Istituto Nazionale di Astrofisica, Italy
*  LBT Beteiligungsgesellschaft, Germany, representing the Max Planck
Society, the Astrophysical Institute Potsdam, and Heidelberg University
*  The Ohio State University
*  The Research Corporation, on behalf of The University of Notre Dame,
University of Minnesota and University of Virginia
```
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GCN Circular #6483
V. Rumyantsev (CrAO), V. Biryukov (CrAO, SAI MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed error box of GRB070518 with 1-m Zeiss (Simeiz) telescopes of CrAO in R-band on May 18 between (UT)19:35 and 20:30. Due to blending of the nearby star (USNO-A2.0 R=3D18.7) and poor seeing (~4.5") we do not resolve clearly optical transient (Guidorzi et al., GCN 6415) in a combined image. More sophisticated photometry estimation is underway. A limiting magnitude of the combined image is based on USNO A2.0:
```
Mid time (UT),  Exposure,   R_Lim (3sigma),   Seeing

May 18.835      50x60       22.0              4.5"
```
This message may be cited.
GCN Report 57.2
GCN_Report 57.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_57_2.pdf by C. Guidorzi at U.Bicocca/INAF-OAB titled: "Final Swift observations of GRB 070518"
D. Perley's Keck GRB Host project: suggests potential host galaxy at z=1.161 (OII). Conflict with z<0.7 limit from GCN 6419??

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Jochen Greiner, last update: 28-Nov-2012 [Disclaimer]