Gamma-ray Burst 070808

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:28:23 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     287260,   Seg_Num: 0
GRB_RA:            6.766d {+00h 27m 04s} (J2000),
                   6.863d {+00h 27m 27s} (current),
                   6.125d {+00h 24m 30s} (1950)
GRB_DEC:          +1.166d {+01d 09' 59"} (J2000),
                  +1.208d {+01d 12' 30"} (current),
                  +0.890d {+00d 53' 23"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5799 [cnts]    Image_Peak=360 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 50-350 keV
BKG_INTEN:       31543 [cnts]
BKG_TIME:        66461.85 SOD {18:27:41.85} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14320 TJD;   220 DOY;   07/08/08
GRB_TIME:        66480.54 SOD {18:28:00.54} UT
GRB_PHI:         168.41 [deg]
GRB_THETA:        39.40 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.09 [sigma]
IMAGE_SIGNIF:    13.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +3 +10  +0  +0 +63  +1 
SUN_POSTN:       138.30d {+09h 13m 11s}  +16.09d {+16d 05' 19"}
SUN_DIST:        129.04 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.64d {+05h 30m 32s}  +28.32d {+28d 19' 12"}
MOON_DIST:        76.92 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.24,-61.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.67, -1.61 [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 = 103.90,8.07 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:30:25 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.184d {+01d 11' 03"} (J2000)
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66594.97 SOD {18:29:54.97} UT,   114.4 [sec] since BAT Trigger Time
COUNTS:          7    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:     Wed 08 Aug 07 18:31:38 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     287260,   Seg_Num: 0
GRB_RA:            6.766d {+00h 27m 04s} (J2000),
                   6.863d {+00h 27m 27s} (current),
                   6.125d {+00h 24m 30s} (1950)
GRB_DEC:          +1.166d {+01d 09' 59"} (J2000),
                  +1.208d {+01d 12' 30"} (current),
                  +0.890d {+00d 53' 23"} (1950)
GRB_DATE:        14320 TJD;   220 DOY;   07/08/08
GRB_TIME:        66480.54 SOD {18:28:00.54} UT
TRIGGER_INDEX:   146
GRB_PHI:         168.41 [deg]
GRB_THETA:        39.40 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.09 [sigma]
IMAGE_SIGNIF:    13.20 [sigma]
LC_URL:          sw00287260000msb.lc
SUN_POSTN:       138.30d {+09h 13m 12s}  +16.09d {+16d 05' 17"}
SUN_DIST:        129.04 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.67d {+05h 30m 41s}  +28.32d {+28d 19' 14"}
MOON_DIST:        76.95 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.24,-61.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.67, -1.61 [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 = 103.90,8.07 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:32:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.184d {+01d 11' 03"} (J2000)
POINT_ROLL:      68.015d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66598.17 SOD {18:29:58.17} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.714
N_STARS:         22
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0117.fits
SUN_POSTN:       138.30d {+09h 13m 12s}  +16.09d {+16d 05' 17"}
SUN_DIST:        128.98 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.68d {+05h 30m 42s}  +28.32d {+28d 19' 15"}
MOON_DIST:        76.90 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:32:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.184d {+01d 11' 03"} (J2000)
POINT_ROLL:      68.015d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66598.17 SOD {18:29:58.17} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.714
N_STARS:         22
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0117.fits
SUN_POSTN:       138.30d {+09h 13m 12s}  +16.09d {+16d 05' 16"}
SUN_DIST:        128.98 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.68d {+05h 30m 43s}  +28.32d {+28d 19' 15"}
MOON_DIST:        76.90 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:33:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.184d {+01d 11' 03"} (J2000)
ROLL:            68.015d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66598.17 SOD {18:29:58.17} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     208290600
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0117.fits
SUN_POSTN:       138.30d {+09h 13m 12s}  +16.09d {+16d 05' 16"}
SUN_DIST:        128.98 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.69d {+05h 30m 45s}  +28.32d {+28d 19' 16"}
MOON_DIST:        76.91 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:33:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.184d {+01d 11' 03"} (J2000)
ROLL:            68.015d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66598.17 SOD {18:29:58.17} UT,   117.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     208290600
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0117.fits
SUN_POSTN:       138.30d {+09h 13m 12s}  +16.09d {+16d 05' 15"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.69d {+05h 30m 47s}  +28.32d {+28d 19' 16"}
MOON_DIST:        76.91 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:39:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
POINT_ROLL:      68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66704.03 SOD {18:31:44.03} UT,   223.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.733
N_STARS:         33
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0223.fits
SUN_POSTN:       138.30d {+09h 13m 13s}  +16.09d {+16d 05' 11"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.76d {+05h 31m 03s}  +28.32d {+28d 19' 21"}
MOON_DIST:        76.98 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:40:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
POINT_ROLL:      68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66704.03 SOD {18:31:44.03} UT,   223.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.733
N_STARS:         33
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0223.fits
SUN_POSTN:       138.30d {+09h 13m 13s}  +16.09d {+16d 05' 11"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.77d {+05h 31m 04s}  +28.32d {+28d 19' 22"}
MOON_DIST:        76.98 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:41:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
ROLL:            68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66704.03 SOD {18:31:44.03} UT,   223.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     208290706
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0223.fits
SUN_POSTN:       138.31d {+09h 13m 13s}  +16.09d {+16d 05' 10"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.78d {+05h 31m 06s}  +28.32d {+28d 19' 22"}
MOON_DIST:        76.99 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:41:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
ROLL:            68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66704.03 SOD {18:31:44.03} UT,   223.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     208290706
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0223.fits
SUN_POSTN:       138.31d {+09h 13m 13s}  +16.09d {+16d 05' 10"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.78d {+05h 31m 07s}  +28.32d {+28d 19' 22"}
MOON_DIST:        76.99 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:44:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
POINT_ROLL:      68.017d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67336.35 SOD {18:42:16.35} UT,   855.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.812
N_STARS:         26
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00287260000msufc0855.fits
SUN_POSTN:       138.31d {+09h 13m 14s}  +16.09d {+16d 05' 08"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.81d {+05h 31m 14s}  +28.32d {+28d 19' 25"}
MOON_DIST:        77.02 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:44:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
POINT_ROLL:      68.017d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67336.35 SOD {18:42:16.35} UT,   855.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.812
N_STARS:         26
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00287260000msufc0855.fits
SUN_POSTN:       138.31d {+09h 13m 14s}  +16.09d {+16d 05' 08"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.81d {+05h 31m 15s}  +28.32d {+28d 19' 25"}
MOON_DIST:        77.02 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:45:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
ROLL:            68.017d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67336.35 SOD {18:42:16.35} UT,   855.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     208291338
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0855.fits
SUN_POSTN:       138.31d {+09h 13m 14s}  +16.09d {+16d 05' 07"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.82d {+05h 31m 17s}  +28.32d {+28d 19' 26"}
MOON_DIST:        77.03 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:46:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.820d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.183d {+01d 10' 57"} (J2000)
ROLL:            68.017d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67336.35 SOD {18:42:16.35} UT,   855.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     208291338
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0855.fits
SUN_POSTN:       138.31d {+09h 13m 14s}  +16.09d {+16d 05' 07"}
SUN_DIST:        128.99 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.83d {+05h 31m 19s}  +28.32d {+28d 19' 26"}
MOON_DIST:        77.03 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:47:12 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     287260,   Seg_Num: 0
GRB_RA:            6.7628d {+00h 27m 03.0s} (J2000),
                   6.8603d {+00h 27m 26.4s} (current),
                   6.1217d {+00h 24m 29.2s} (1950)
GRB_DEC:          +1.1757d {+01d 10' 32.5"} (J2000),
                  +1.2177d {+01d 13' 03.7"} (current),
                  +0.8991d {+00d 53' 56.5"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  66617.00 SOD {18:30:17.00} UT,   136.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       138.31d {+09h 13m 14s}  +16.08d {+16d 05' 06"}
SUN_DIST:        129.05 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.84d {+05h 31m 22s}  +28.32d {+28d 19' 27"}
MOON_DIST:        77.10 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.24,-61.09 [deg] galactic lon,lat of the burst
ECL_COORDS:        6.67, -1.60 [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.php for details.

GCN Circular #6718
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/GSFC/USRA), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 18:28:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070808 (trigger=287260). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 6.766, +1.166 which is
```
   RA(J2000)  =  00h 27m 04s
   Dec(J2000) = +01d 09' 59"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED peak structure with a duration of about 10 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began taking data at 18:29:54 UT, 114 seconds after the BAT trigger. Using prompt downlinked data, we find a fading, uncatalogued X-ray source located at RA, Dec: 6.7628, 1.1758 which is
```
   RA(J2000)  = 00 27 03.08
   Dec(J2000) = +01 10 32.7
```
with an uncertainty of 4.5 arcsec (radius, 90% containment). This location is 36 arcseconds from the BAT on-board position, within the BAT error circle.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 118 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7' x 2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02 mag.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). 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:     Wed 08 Aug 07 18:51:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.819d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.182d {+01d 10' 56"} (J2000)
POINT_ROLL:      68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67442.31 SOD {18:44:02.31} UT,   961.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.769
N_STARS:         40
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0961.fits
SUN_POSTN:       138.31d {+09h 13m 15s}  +16.08d {+16d 05' 03"}
SUN_DIST:        129.00 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.88d {+05h 31m 32s}  +28.32d {+28d 19' 30"}
MOON_DIST:        77.08 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 Aug 07 18:51:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.819d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.182d {+01d 10' 56"} (J2000)
POINT_ROLL:      68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67442.31 SOD {18:44:02.31} UT,   961.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.769
N_STARS:         40
X_OFFSET:        104 [pixels]
Y_OFFSET:        717 [pixels]
X_MAX:           1063 [pixels]
Y_MAX:           1676 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00287260000msufc0961.fits
SUN_POSTN:       138.31d {+09h 13m 15s}  +16.08d {+16d 05' 03"}
SUN_DIST:        129.00 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.89d {+05h 31m 33s}  +28.33d {+28d 19' 30"}
MOON_DIST:        77.09 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:52:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.819d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.182d {+01d 10' 56"} (J2000)
ROLL:            68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67442.31 SOD {18:44:02.31} UT,   961.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     208291444
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0961.fits
SUN_POSTN:       138.31d {+09h 13m 15s}  +16.08d {+16d 05' 02"}
SUN_DIST:        129.00 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.90d {+05h 31m 35s}  +28.33d {+28d 19' 31"}
MOON_DIST:        77.09 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:     Wed 08 Aug 07 18:52:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     287260,   Seg_Num: 0
POINT_RA:          6.819d {+00h 27m 17s} (J2000)
POINT_DEC:        +1.182d {+01d 10' 56"} (J2000)
ROLL:            68.018d
IMG_START_DATE:  14320 TJD;   220 DOY;   07/08/08
IMG_START_TIME:  67442.31 SOD {18:44:02.31} UT,   961.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     208291444
X_OFFSET:        423 [pixels]
Y_OFFSET:        1036 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       583
Y_GRB_POS:       1196
BINNING_INDEX:   1
IM_URL:          sw00287260000msuni0961.fits
SUN_POSTN:       138.31d {+09h 13m 15s}  +16.08d {+16d 05' 02"}
SUN_DIST:        129.00 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       82.90d {+05h 31m 36s}  +28.33d {+28d 19' 31"}
MOON_DIST:        77.10 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      110.36,-61.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.73, -1.62 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #6719
B. E. Schaefer (Louisiana State), H. Swan (U Mich), E.S. Rykoff (U Mich), F. Yuan (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 070808 (Swift trigger 287260; J. R. Cummings et al., GCN 6718), producing images beginning 7.6 s after the GCN notice time. An automated response took the first image at 18:28:29.6 UT, 29.0 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec and 10 60-sec exposures, with further exposures ongoing. These unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle or the XRT error circle; the field is not crowded. Individual images have limiting magnitudes ranging from 16.2-17.6; we set the following specific limits.
```
start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
18:28:29.6   18:28:34.6         5     16.2           29.0       N
```
GCN Circular #6720
Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report:
The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB070808 prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community.
Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB070808
We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=6.76600 (00:27:03.8), dec=1.16600 (01:09:57.6); Swift-BAT TRIGGER 287260), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information.
In the file GRB070808_sdss.calstar.dat, we report photometry and astrometry of 148 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well-detected in the u-band; use the errors and object flags to monitor data quality.
In the files GRB070808_sdss.objects_flux.dat and GRB070808_sdss.objects_magnitudes.dat, we report photometry of 1167 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r-band. The fluxes listed in GRB070808_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB070808_sdss.objects_magnitudes.dat are asinh magnitudes.
All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.134 mag, A_g=0.098 mag, A_r = 0.071 mag, A_i=0.054 mag, and A_z=0.038 mag.
The file GRB070808_sdss.spectro.dat contains a list of the 21 objects with SDSS spectroscopy within 6 arcminutes of the GRB position. In addition to the redshift and 1-sigma error for each object, this file also lists the object spectroscopic classification.
SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region.
More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, PASP 118, 733). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr5
These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag.
This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2006, ApJS, 162, 38), when using the data or referring to the technical documentation.
GCN Circular #6721
M. Uemura, A. Arai, M. Sasada, M. Isogai, T. Uehara (Hiroshima Univ.), and D. Nogami (Kyoto Univ.) report on behalf of the KANATA GRB team:
We started optical imaging of the field of GRB070808 (GCN 6718) at 18:29:38 UT 8 Aug. using TRISPEC attached to the KANATA 1.5-m telescope at Higashi-Hiroshima Observatory, Japan. Exposure times for Rc-band images are 30 sec.
No new object was significantly detected. In our first image, a limit magnitude was estimated from neighbour USNO A2.0 stars as below:
18:29:53 UT 8 Aug. 20.5 Rc
Follow-up observations are ongoing.
GCN Circular #6722
Y.Q. Lou, X.F. Wang, 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 070808 (Cummings et al., GCN 6718) with the Xinglong TNT 80cm telescope. Observation started from 18:29:55, 115s after the burst with White and R band. No new object was seen in our combined image within XRT error circle. The 3 sigam limit is ~19.7 in our co-added White image derived from USNO-A2.0, with mean time ~330s after the burst. Observation is on going.
This message may be cited.
GCN Circular #6723
A. Stefanescu (1), S. Duscha (1), G. Kanbach (1), F. Schrey (1), A. Slowikowska (2)(3), H. Steinle (1) ((1)=MPE Garching, (2)=FORTH, Heraklion (3)=NCAC, Torun) of the OPTIMA-Burst Team report the following:
OPTIMA-Burst at the 1.3m Skinakas Observatory, of the University of Crete, Greece observed the location of the XRT error-circle of GRB 070808 (GCN Circ 6718, J. R. Cummings et al.), starting at 2007-08-08 21:45:35 UT (3.3h after the burst).
We did not detect any source inside the XRT error-circle in 3 co-added 900s exposures in R-filter.
Our limit is as follows:
```
t-t_0 (mid-exp)       t_exp     R-limit
13229s (i.e. 3.7h)    2700s     22.0
```
GCN Circular #6724
E. Fenimore (LANL), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), 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), T. Ukwatta (GWU)
Using the data set from T-120 to T+218 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070808 (trigger #287260) (Cummings, et al., GCN Circ. 6718). The BAT ground-calculated position is RA, Dec = 6.761, 1.180 deg which is
```
   RA(J2000) = 0h 27m 2.6s 
   Dec(J2000) = 1d 10' 47" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%.
The burst had a single FRED peak. T90 (15-350 keV) was 32 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-0.7 to T+41.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.47 +- 0.14. The fluence in the 15-150 keV band was 1.2 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+0.73 sec in the 15-150 keV band was 2.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6725
R. Starling (U. Leicester) and J.R. Cummings (NASA/UMBC) report on behalf of the Swift XRT team:
We have analysed the first orbit and part of the second orbit of Swift XRT data for GRB 070808 (trigger=287260; Cummings et al., GCN Circ. 6718), covering 114-7500 s since BAT trigger.
Using 799 s of overlapping XRT Photon Counting mode and UVOT V-band data, 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 (J2000) = 6.76402, 1.17635 deg, which is equivalent to:
```
RA (J2000):  00h 27m 3.36s
Dec (J2000): +01d 10' 34.8''
```
with an uncertainty of 1.9 arcsec (radius, 90% confidence). This is 4.7 arcsec from the initial XRT position (GCN Circ. 6718) and 16.7 arcsec from the BAT refined position (Fenimore et al. 2007, GCN Circ. 6724).
The 0.3-10 keV lightcurve shows a smooth and somewhat curved decay, which can be modelled with a broken power law with alpha_1=3.5 +0.7/-0.2, T_bk=234 +13/-20 s and alpha_2=1.06 +0.1/-0.08.
The PC mode spectrum from 500-7500 s since trigger can be modelled with an absorbed power law with photon index Gamma=2.8 +/-0.5, and nH=(1.2 +0.5/-0.3)E22 cm^-2 in excess of the Galactic column of 3E20 cm^-2. The 0.3-10 keV observed (unabsorbed) flux is 2.4E-12 (1.0E-11) erg/cm^2/s corresponding to a count rate of 4.5E-2 count/s and a count rate to flux conversion of 1 count/s = 5E-11 erg/cm^2/s.
Assuming the X-ray emission continues to decay with alpha=1.06, we predict a count rate at T+24h of 9E-4 count/s.
This circular is an official product of the Swift XRT team.
GCN Circular #6727
A. Melandri, (Liverpool JMU), C. Guidorzi (Uni-Bicocca/INAF-OAB), R.J. Smith, I.A. Steele, C.G. Mundell, M.J. Burgdorf, C.J. Mottram, M.F. Bode, S.N. Fraser, S. Kobayashi, D.F. Bersier (Liverpool JMU), A. Gomboc (Ljubljana), P. O'Brien, E. Rol, N. Bannister, N. Tanvir (U. Leicester) report on behalf of larger GRB collaboration :
On 2007 Aug 08 at 18:30:21 UT the Faulkes Telescope South automatically observed the field of GRB 070808 (trigger=287260, Cummings et al., GCN 6718).
On our coadded frames we do not detect any source inside the refined XRT error circle (Starling et al., GCN 6725) down to a limiting magnitude of
```
Filter  Tstart(min)  Tstop(min)    Exposure(s)   M_lim
---------------------------------------------------------
   R       2.35          62.9          960         20.6
   i'      5.55          53.4          700         20.5
---------------------------------------------------------
```
Magnitudes are calibrated with respect to USNOB1 R2 in the R filter. For the SDSS-i' filter we used the magnitude derived from the pre-burst calibration field of Cool et al. (GCN 6720).
GCN Circular #6730
F.E. Marshall (NASA/GSFC) and J.R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 070808 starting 119 s after the BAT trigger (Cummings et al., GCN Circ. 6718). We do not find a source in any of the UVOT observations inside the refined XRT error circle (Starling and Cummings, GCN Circ. 6725). The 3-sigma upper limits for detecting a source in the first finding chart (FC) exposure and co-added frames are:
```
Filter            T_start(s)   T_stop(s)     Exp(s)     Mag (3-sigma UL)

white (FC)        119          218           98         >20.6
white             119          7539          628        >20.9
v                 225          6515          1051       >20.4
b                 704          7334          461        >20.5
u                 680          7129          490        >20.6
uvw1              655          6925          490        >20.3
uvm2              783          6720          452        >20.9
uvw2              734          7625          353        >20.8
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V) = 0.02 mag in the direction of the burst (Schlegel et al. 1998).
arXiv:1504.02482 very large excess XRT NH column density implies z<2.2

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Jochen Greiner, last update: 07-Jul-2015 [Disclaimer]