Gamma-ray Burst 090807

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:03:32 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.7440d {+18h 14m 58.56s} (J2000),
                 273.8573d {+18h 15m 25.76s} (current),
                 273.1538d {+18h 12m 36.90s} (1950)
GRB_DEC:         +10.2649d {+10d 15' 53.6"} (J2000),
                 +10.2684d {+10d 16' 06.3"} (current),
                 +10.2482d {+10d 14' 53.3"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.55e-09 [erg/cm2/sec]
GRB_SIGNIF:      13.67 [sigma]
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54180.52 SOD {15:03:00.52} UT,   153.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.25 261.44 243.52
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 57"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.82d {+22h 15m 16s}   -7.83d {-07d 49' 53"}
MOON_DIST:        62.37 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.08, 12.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.43, 33.65 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.95 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:03:51 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.7440d {+18h 14m 58.5s} (J2000),
                 273.8573d {+18h 15m 25.7s} (current),
                 273.1538d {+18h 12m 36.9s} (1950)
GRB_DEC:         +10.2649d {+10d 15' 53.6"} (J2000),
                 +10.2684d {+10d 16' 06.3"} (current),
                 +10.2482d {+10d 14' 53.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       187 [cnts]
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54180.52 SOD {15:03:00.52} UT,   153.5 [sec] since BAT Trigger Time
CENTROID_X:      292.82,  raw= 293  [pixels]
CENTROID_Y:      321.32,  raw= 321  [pixels]
ROLL:            300.91 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   54.98
GRB_POS_XRT_Z:   -22.33
IMAGE_URL:       sw00359378000msxps_rw.img
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 56"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.82d {+22h 15m 16s}   -7.83d {-07d 49' 49"}
MOON_DIST:        62.37 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.08, 12.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.43, 33.65 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:03:47 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.7440d {+18h 14m 58.5s} (J2000),
                 273.8573d {+18h 15m 25.7s} (current),
                 273.1538d {+18h 12m 36.9s} (1950)
GRB_DEC:         +10.2649d {+10d 15' 53.6"} (J2000),
                 +10.2684d {+10d 16' 06.3"} (current),
                 +10.2482d {+10d 14' 53.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       187 [cnts]
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54180.52 SOD {15:03:00.52} UT,   153.5 [sec] since BAT Trigger Time
CENTROID_X:      292.82,  raw= 293  [pixels]
CENTROID_Y:      321.32,  raw= 321  [pixels]
ROLL:            300.91 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   54.98
GRB_POS_XRT_Z:   -22.33
IMAGE_URL:       sw00359378000msxps_rw.img
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 56"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.82d {+22h 15m 16s}   -7.83d {-07d 49' 50"}
MOON_DIST:        62.37 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.08, 12.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.43, 33.65 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:02:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.744d {+18h 14m 59s} (J2000),
                 273.858d {+18h 15m 26s} (current),
                 273.154d {+18h 12m 37s} (1950)
GRB_DEC:         +10.281d {+10d 16' 51"} (J2000),
                 +10.284d {+10d 17' 04"} (current),
                 +10.264d {+10d 15' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=3085 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        15050 TJD;   219 DOY;   09/08/07
GRB_TIME:        54027.02 SOD {15:00:27.02} UT
GRB_PHI:          18.63 [deg]
GRB_THETA:        31.85 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.18 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +2  +0  +0 +62  +0 
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 57"}
SUN_DIST:        129.14 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.81d {+22h 15m 13s}   -7.84d {-07d 50' 10"}
MOON_DIST:        62.37 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.43, 33.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 11.75,-6.47 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:04:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.744d {+18h 14m 59s} (J2000),
                 273.858d {+18h 15m 26s} (current),
                 273.154d {+18h 12m 37s} (1950)
GRB_DEC:         +10.281d {+10d 16' 51"} (J2000),
                 +10.284d {+10d 17' 04"} (current),
                 +10.264d {+10d 15' 51"} (1950)
GRB_DATE:        15050 TJD;   219 DOY;   09/08/07
GRB_TIME:        54027.02 SOD {15:00:27.02} UT
TRIGGER_INDEX:   20000
GRB_PHI:          18.63 [deg]
GRB_THETA:        31.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.18 [sigma]
LC_URL:          sw00359378000msb.lc
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 56"}
SUN_DIST:        129.14 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.82d {+22h 15m 17s}   -7.83d {-07d 49' 41"}
MOON_DIST:        62.38 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.43, 33.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO -- this is not a normal BAT-detected burst.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 11.75,-6.47 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:06:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.275d {+10d 16' 31"} (J2000)
POINT_ROLL:      300.906d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54190.57 SOD {15:03:10.57} UT,   163.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.045
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00359378000msufc0163.fits
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 55"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.84d {+22h 15m 21s}   -7.82d {-07d 49' 18"}
MOON_DIST:        62.38 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:06:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.275d {+10d 16' 31"} (J2000)
POINT_ROLL:      300.906d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54190.57 SOD {15:03:10.57} UT,   163.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.045
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00359378000msufc0163.fits
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.27d {+16d 15' 54"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.84d {+22h 15m 22s}   -7.82d {-07d 49' 09"}
MOON_DIST:        62.38 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:06:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.275d {+10d 16' 31"} (J2000)
POINT_ROLL:      300.906d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54190.57 SOD {15:03:10.57} UT,   163.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.045
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00359378000msufc0163.fits
SUN_POSTN:       137.70d {+09h 10m 48s}  +16.27d {+16d 15' 55"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.84d {+22h 15m 21s}   -7.82d {-07d 49' 18"}
MOON_DIST:        62.38 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:07:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.275d {+10d 16' 31"} (J2000)
ROLL:            300.906d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54190.57 SOD {15:03:10.57} UT,   163.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271350195
X_OFFSET:        787 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0168.fits
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.26d {+16d 15' 54"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.85d {+22h 15m 23s}   -7.82d {-07d 48' 58"}
MOON_DIST:        62.39 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:08:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.275d {+10d 16' 31"} (J2000)
ROLL:            300.906d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54190.57 SOD {15:03:10.57} UT,   163.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271350195
X_OFFSET:        787 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0168.fits
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.26d {+16d 15' 53"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.85d {+22h 15m 24s}   -7.81d {-07d 48' 52"}
MOON_DIST:        62.39 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:09:02 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     359378,   Seg_Num: 0
GRB_RA:          273.7426d {+18h 14m 58.22s} (J2000),
                 273.8559d {+18h 15m 25.42s} (current),
                 273.1524d {+18h 12m 36.57s} (1950)
GRB_DEC:         +10.2673d {+10d 16' 02.2"} (J2000),
                 +10.2708d {+10d 16' 15.0"} (current),
                 +10.2506d {+10d 15' 02.0"} (1950)
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54340.00 SOD {15:05:40.00} UT,   313.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.26d {+16d 15' 53"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.86d {+22h 15m 26s}   -7.81d {-07d 48' 41"}
MOON_DIST:        62.41 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.08, 12.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.43, 33.65 [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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:10:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 27"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54348.74 SOD {15:05:48.74} UT,   321.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.697
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359378000msufc0321.fits
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.26d {+16d 15' 51"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.87d {+22h 15m 29s}   -7.81d {-07d 48' 19"}
MOON_DIST:        62.41 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:11:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 27"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54348.74 SOD {15:05:48.74} UT,   321.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.697
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359378000msufc0321.fits
SUN_POSTN:       137.71d {+09h 10m 49s}  +16.26d {+16d 15' 51"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.87d {+22h 15m 30s}   -7.80d {-07d 48' 13"}
MOON_DIST:        62.41 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:10:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 27"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54348.74 SOD {15:05:48.74} UT,   321.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.697
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359378000msufc0321.fits
SUN_POSTN:       137.70d {+09h 10m 49s}  +16.26d {+16d 15' 51"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.87d {+22h 15m 29s}   -7.81d {-07d 48' 19"}
MOON_DIST:        62.41 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:12:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 27"} (J2000)
ROLL:            300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54348.74 SOD {15:05:48.74} UT,   321.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     271350353
X_OFFSET:        787 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0326.fits
SUN_POSTN:       137.71d {+09h 10m 49s}  +16.26d {+16d 15' 50"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.88d {+22h 15m 32s}   -7.80d {-07d 48' 01"}
MOON_DIST:        62.42 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:12:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 27"} (J2000)
ROLL:            300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54348.74 SOD {15:05:48.74} UT,   321.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     271350353
X_OFFSET:        787 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0326.fits
SUN_POSTN:       137.71d {+09h 10m 49s}  +16.26d {+16d 15' 50"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.88d {+22h 15m 32s}   -7.80d {-07d 47' 56"}
MOON_DIST:        62.42 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:18:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 26"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54903.24 SOD {15:15:03.24} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.435
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        202 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1641 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00359378000msufc0876.fits
SUN_POSTN:       137.71d {+09h 10m 50s}  +16.26d {+16d 15' 46"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.93d {+22h 15m 42s}   -7.78d {-07d 46' 43"}
MOON_DIST:        62.45 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:18:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 26"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54903.24 SOD {15:15:03.24} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.435
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        202 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1641 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00359378000msufc0876.fits
SUN_POSTN:       137.71d {+09h 10m 50s}  +16.26d {+16d 15' 46"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.93d {+22h 15m 42s}   -7.78d {-07d 46' 43"}
MOON_DIST:        62.45 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Aug 09 15:18:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 26"} (J2000)
POINT_ROLL:      300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54903.24 SOD {15:15:03.24} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.435
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        202 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1641 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00359378000msufc0876.fits
SUN_POSTN:       137.71d {+09h 10m 50s}  +16.26d {+16d 15' 46"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.93d {+22h 15m 44s}   -7.78d {-07d 46' 35"}
MOON_DIST:        62.46 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:19:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 26"} (J2000)
ROLL:            300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54903.24 SOD {15:15:03.24} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271350908
X_OFFSET:        786 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0881.fits
SUN_POSTN:       137.71d {+09h 10m 51s}  +16.26d {+16d 15' 45"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.94d {+22h 15m 45s}   -7.77d {-07d 46' 23"}
MOON_DIST:        62.46 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 07 Aug 09 15:20:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359378,   Seg_Num: 0
POINT_RA:        273.757d {+18h 15m 02s} (J2000)
POINT_DEC:       +10.274d {+10d 16' 26"} (J2000)
ROLL:            300.905d
IMG_START_DATE:  15050 TJD;   219 DOY;   09/08/07
IMG_START_TIME:  54903.24 SOD {15:15:03.24} UT,   876.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271350908
X_OFFSET:        786 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00359378000msuni0881.fits
SUN_POSTN:       137.71d {+09h 10m 51s}  +16.26d {+16d 15' 45"}
SUN_DIST:        129.15 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      333.94d {+22h 15m 46s}   -7.77d {-07d 46' 19"}
MOON_DIST:        62.47 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       38.09, 12.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.44, 33.66 [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 #9746
J. K. Cannizzo (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), P.A. Curran (MSSL-UCL), A. de Ugarte Postigo (INAF-OAB), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (MSSL), J. Mao (INAF-OAB), R. Margutti (Univ Bicocca&OAB), K. L. Page (U Leicester), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 15:00:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090807 (trigger=359378). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 273.744, +10.281 which is
```
   RA(J2000)  =  18h 14m 59s
   Dec(J2000) = +10d 16' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT TDRSS light curve does not show anything as is typical for image triggers.
The XRT began observing the field at 15:03:00.5 UT, 153.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 273.7438, 10.2665 which is equivalent to:
```
   RA(J2000)  = 18h 14m 58.51s
   Dec(J2000) = +10d 15' 59.3"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 52 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (8.6e+20 cm^-2, Kalberla et al. 2005), with an excess column of 2 (+1.68/-1.50) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 8.55e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of nominal 150 seconds with the White filter starting 163 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 100% of the XRT error circle. The 3-sigma upper limit is about 19.2 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.18.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo 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 Circular #9747
K.Kono, K.Noda, E.Sonoda, N.Ohmori, H.hayasi, A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB 090807 (Swift trigger 359378, GCN 9746, J. K. Cannizzo et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 15:04:25 UT, about 2.2 min after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. (GCN 9746, J. K. Cannizzo et al.)
the upper limits are as follows:
```
--------------------------------------------------------------
Start(UT)	 End(UT) $B!!!!(BNum. of frames $B!!(BLimit (mag.)
--------------------------------------------------------------
15:04:25 	15:04:55 	1 	12.6
15:04:25 	15:30:26 	19 	18.5
---------------------------------------------------------------
```
GCN Circular #9748
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1531 s of XRT Photon Counting mode data and 2 UVOT images for GRB 090807, 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 = 273.74377, +10.26583 which is equivalent to:
```
RA (J2000): 18h 14m 58.50s
Dec (J2000): +10d 15' 57.0"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9749
T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. K. Cannizzo (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-239 to T+423 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090807 (trigger #359378) (Cannizzo, et al., GCN Circ. 9746). The BAT ground-calculated position is RA, Dec = 273.741, 10.279 deg which is
```
   RA(J2000)  =  18h 14m 57.8s
   Dec(J2000) = +10d 16' 45.9"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
The mask-weighted light curve shows a complex structure lasting from T-5 to T+150 seconds with at least five peaks superimposed on a broad, soft and slowly varying background. There is an additional peak at T+185 sec which corresponds to a large flare seen in the Swift/XRT. There is also possible precursor activity from T-200 to T-80 sec. T90 (15-350 keV) is 140.8 +- 13.1 sec (estimated error including systematics).
The time-averaged spectrum from T-9.5 to T+151.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.25 +- 0.14. The fluence in the 15-150 keV band is 2.2 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+41.96 sec in the 15-150 keV band is 0.7 +- 0.2 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/359378/BA/
GCN Circular #9750
R. Margutti (Univ. Bicocca & INAF-OAB), J. Mao (INAF-OAB), A. de Ugarte Postigo (INAF-OAB) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed the first orbit of Swift-XRT data obtained for GRB 090807 (Cannizzo et al. GCN Circ. 9746), covering 149 s of Windowed Timing (WT) and 1.5 ks of Photon Counting (PC) mode data, respectively, between 154 s and 1.9 ks after the trigger. The UVOT-enhanced XRT position was given by Beardmore et al. in GCN Circ. 9748.
The light curve shows a large flare peaking around 185 s which was also detected in the 15-150 keV energy range by Swift/BAT (Ukwatta et al. GCN Circ. 9749). The underlying light curve decays with a power-law index of 5.0 +/- 0.5. Around T+580 s the decay flattens, to a slope of 0.87 +/- 0.42.
The spectrum extracted from WT data can be modelled with an absorbed simple power-law, with Gamma = 2.2 +/- 0.1 and NH = (3.0+/-0.2)x10^21 cm^-2 in excess of the Galactic column in this direction which is 8.6x10^20 cm^-2 (Kalberla et al. 2005). A spectrum extracted from PC data in the time interval T+310 s - T+1840 s has a best-fitting photon index of 2.6 +/- 0.4 and a best-fitting absorption column of NH = (3.3+/-0.1)x10^21 cm^-2 in excess of the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (8.4 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 0.9, the count rate at T+24 hours will be 0.002 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.2 x 10^-14 (1.7 x 10^-13) erg cm^-2 s^-1. However, the light-curve is possible to break before this time, making this prediction unreliable.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00359378.
This circular is an official product of the Swift-XRT team.
GCN Circular #9751
C. A. Swenson (PSU) and Cannizzo (NASA/UMBC)report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090807 164 s after the BAT trigger (Cannizzo et al., GCN Circ. 9746). No optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ. 9748) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           164          313          147         >21.2
u_FC               322          571          246         >20.1
white              164         1026          295         >21.1
u                  322          571          246         >20.1
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.18 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #9752
M. Yoshida, D. Kuroda, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 090807 (Cannizzo et al. GCN 9746) with optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2009-08-07 15:03:35 UT (3m 8s after the burst). We did not find any point source in the error circle of the XRT position reported by Beardmore et al. (GCN 9748) in all the three bands.
Three sigma upper limits of the OT are listed below. We used USNO B1 catalog for flux calibration.
```
PDAY        MID-UT   T-EXP     g'     Rc     Ic
---------------------------------------------------
0.00589   15:08:56   540.0   >18.3  >18.5  >18.2
0.04169   16:00:30  4860.0   >18.9  >19.1  >18.7
---------------------------------------------------
```
GCN Circular #9753
C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana), R.J. Smith, C.G. Mundell, I.A. Steele, A. Melandri, S. Kobayashi, C.J. Mottram, D.F. Bersier, Z. Cano (Liverpool JMU), N.R. Tanvir, P. O'Brien (U. Leicester) report on behalf of a large collaboration:
On 2009 August 07 at 23:45:24 UT we observed the Swift GRB 090807 (Cannizzo et al., GCN Circ. 9746) with the 2-m Liverpool Telescope.
Observations started 8.75 hours after the BAT trigger time and were performed using the r' and i' filters. We could not find any uncatalogued object inside the UVOT-enhanced XRT error circle (Beardmore et al. GCN Circ. 9748) down to the following limiting magnitudes:
```
Time Interval     Total Exp  Filter     Limit
(hours from GRB)   (s)                  (mag)
----------------------------------------------
8.75-9.27          6x300      R > 22.1
9.29-9.90          6x300      I > 22.0
----------------------------------------------
```
Magnitudes have been calibrated against the nearby USNOB-1 star RA=18:15:00.349, Dec=+10:15:45.21, using R2=16.19, I=15.82.
We note the presence of an uncatalogued source lying outside the XRT error circle at 4.2" from the XRT centroid, at RA=18:14:58.24, Dec=+10:15:58.4 with estimated magnitudes R=22.4 +/- 0.2, I=21.6 +/- 0.2:
http://www.fe.infn.it/u/guidorzi/090807_LT_ri.png
At the moment we cannot assess whether this source is fading.
GCN Report 237.1
GCN_Report 237.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_237_1.pdf by J.K. Cannizzo at NASA/UMBC titled: "Final Results on Swift GRB 090807"
GCN Circular #9924
J. Haislip, D. Reichart, A. Smith, D. Caton, L. Hawkins, K. Ivarsen, M. Schubel, A. LaCluyze, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report:
Skynet observed the Swift/BAT localization of GRB 090807 (Cannizzo et al., GCN 9746) with the 14" Dark Sky Observatory telescope in North Carolina beginning 10.4 hours after the trigger in I.
We do not detect the afterglow (Cannizzo et al., GCN 9746). Stacking only images that increase the limiting magnitude yields:
```
mean                                                      1-sig.   1-sig.
time                               3-sig.                 sys.     stat.
since                              lim.     cal.          cal.     cal.
trig.   tel.     exp.       fil.   mag.     stars         unc.     unc.
(h)              (# x s)                                  (mag)    (mag)

10.7    DSO-14   10 x 160   I      18.9     807 USNO B1   0.489    0.000
```

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Jochen Greiner, last update: 18-Sep-2009 [Disclaimer]