Gamma-ray Burst 080804

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:20:28 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.701d {+21h 54m 48s} (J2000),
                 328.844d {+21h 55m 23s} (current),
                 327.864d {+21h 51m 27s} (1950)
GRB_DEC:         -53.195d {-53d 11' 40"} (J2000),
                 -53.154d {-53d 09' 13"} (current),
                 -53.432d {-53d 25' 53"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4718 [cnts]    Image_Peak=143 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 50-350 keV
BKG_INTEN:       30169 [cnts]
BKG_TIME:        83997.00 SOD {23:19:57.00} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14682 TJD;   217 DOY;   08/08/04
GRB_TIME:        84014.66 SOD {23:20:14.66} UT
GRB_PHI:         158.59 [deg]
GRB_THETA:        45.86 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.88 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +7  +0  +0 +79  +1 
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 60"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.16d {+11h 48m 38s}   -2.47d {-02d 27' 55"}
MOON_DIST:       119.54 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.87,-48.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.28,-37.65 [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 = 348.83,20.24 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 04 Aug 08 23:21:20 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    5326,   Sub_Num: 0
GRB_INTEN:      9.13 [sigma]
GRB_TIME:       84014.24 SOD {23:20:14.24} UT
GRB_DATE:       14682 TJD;   217 DOY;   08/08/04
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2008-08-04T23-20-14.0818-07868-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:22:43 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.6649d {+21h 54m 39.5s} (J2000),
                 328.8081d {+21h 55m 13.9s} (current),
                 327.8278d {+21h 51m 18.6s} (1950)
GRB_DEC:         -53.1849d {-53d 11' 05.6"} (J2000),
                 -53.1440d {-53d 08' 38.4"} (current),
                 -53.4216d {-53d 25' 17.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84113.70 SOD {23:21:53.70} UT,   99.0 [sec] since BAT Trigger Time
CENTROID_X:      332.72,  raw= 333  [pixels]
CENTROID_Y:      286.55,  raw= 287  [pixels]
ROLL:            158.89 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -26.98
GRB_POS_XRT_Z:   71.71
IMAGE_URL:       sw00319016000msxps_rw.img
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 58"}
SUN_DIST:        142.30 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.18d {+11h 48m 42s}   -2.47d {-02d 28' 29"}
MOON_DIST:       119.52 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.89,-48.37 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.26,-37.63 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:22:54 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.6649d {+21h 54m 39.5s} (J2000),
                 328.8081d {+21h 55m 13.9s} (current),
                 327.8278d {+21h 51m 18.6s} (1950)
GRB_DEC:         -53.1849d {-53d 11' 05.6"} (J2000),
                 -53.1440d {-53d 08' 38.4"} (current),
                 -53.4216d {-53d 25' 17.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84113.70 SOD {23:21:53.70} UT,   99.0 [sec] since BAT Trigger Time
CENTROID_X:      332.72,  raw= 333  [pixels]
CENTROID_Y:      286.55,  raw= 287  [pixels]
ROLL:            158.89 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -26.98
GRB_POS_XRT_Z:   71.71
IMAGE_URL:       sw00319016000msxps_rw.img
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 58"}
SUN_DIST:        142.30 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.18d {+11h 48m 43s}   -2.48d {-02d 28' 32"}
MOON_DIST:       119.52 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.89,-48.37 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.26,-37.63 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:22:33 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.6649d {+21h 54m 39.5s} (J2000),
                 328.8081d {+21h 55m 13.9s} (current),
                 327.8278d {+21h 51m 18.6s} (1950)
GRB_DEC:         -53.1849d {-53d 11' 05.6"} (J2000),
                 -53.1440d {-53d 08' 38.4"} (current),
                 -53.4216d {-53d 25' 17.8"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.50e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.19 [sigma]
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84113.70 SOD {23:21:53.70} UT,   99.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.27 261.33 243.54
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 58"}
SUN_DIST:        142.30 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.18d {+11h 48m 42s}   -2.47d {-02d 28' 26"}
MOON_DIST:       119.52 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.89,-48.37 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.26,-37.63 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.41 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:23:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.701d {+21h 54m 48s} (J2000),
                 328.844d {+21h 55m 23s} (current),
                 327.864d {+21h 51m 27s} (1950)
GRB_DEC:         -53.195d {-53d 11' 40"} (J2000),
                 -53.154d {-53d 09' 13"} (current),
                 -53.432d {-53d 25' 53"} (1950)
GRB_DATE:        14682 TJD;   217 DOY;   08/08/04
GRB_TIME:        84014.66 SOD {23:20:14.66} UT
TRIGGER_INDEX:   146
GRB_PHI:         158.59 [deg]
GRB_THETA:        45.86 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.88 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
LC_URL:          sw00319016000msb.lc
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 58"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.19d {+11h 48m 45s}   -2.48d {-02d 28' 46"}
MOON_DIST:       119.52 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.87,-48.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.28,-37.65 [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 = 348.83,20.24 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:24:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.690d {+21h 54m 46s} (J2000)
POINT_DEC:       -53.201d {-53d 12' 02"} (J2000)
POINT_ROLL:      158.890d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84123.03 SOD {23:22:03.03} UT,   108.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.387
N_STARS:         52
X_OFFSET:        424 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00319016000msufc0108.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 57"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.19d {+11h 48m 46s}   -2.48d {-02d 28' 53"}
MOON_DIST:       119.50 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:24:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.690d {+21h 54m 46s} (J2000)
POINT_DEC:       -53.201d {-53d 12' 02"} (J2000)
POINT_ROLL:      158.890d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84123.03 SOD {23:22:03.03} UT,   108.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.387
N_STARS:         52
X_OFFSET:        424 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00319016000msufc0108.fits
SUN_POSTN:       135.39d {+09h 01m 34s}  +16.93d {+16d 55' 57"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.20d {+11h 48m 47s}   -2.48d {-02d 29' 03"}
MOON_DIST:       119.50 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:25:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.690d {+21h 54m 46s} (J2000)
POINT_DEC:       -53.201d {-53d 12' 02"} (J2000)
ROLL:            158.890d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84123.03 SOD {23:22:03.03} UT,   108.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239584926
X_OFFSET:        698 [pixels]
Y_OFFSET:        978 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       858
Y_GRB_POS:       1138
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0108.fits
SUN_POSTN:       135.39d {+09h 01m 35s}  +16.93d {+16d 55' 56"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.20d {+11h 48m 48s}   -2.49d {-02d 29' 14"}
MOON_DIST:       119.50 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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:     Mon 04 Aug 08 23:26:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.690d {+21h 54m 46s} (J2000)
POINT_DEC:       -53.201d {-53d 12' 02"} (J2000)
ROLL:            158.890d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84123.03 SOD {23:22:03.03} UT,   108.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239584926
X_OFFSET:        698 [pixels]
Y_OFFSET:        978 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       858
Y_GRB_POS:       1138
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0108.fits
SUN_POSTN:       135.39d {+09h 01m 35s}  +16.93d {+16d 55' 56"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.21d {+11h 48m 49s}   -2.49d {-02d 29' 22"}
MOON_DIST:       119.49 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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:        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:     Mon 04 Aug 08 23:34:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
POINT_ROLL:      158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84229.01 SOD {23:23:49.01} UT,   214.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.265
N_STARS:         108
X_OFFSET:        378 [pixels]
Y_OFFSET:        658 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1617 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00319016000msufc0214.fits
SUN_POSTN:       135.40d {+09h 01m 36s}  +16.93d {+16d 55' 50"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.27d {+11h 49m 05s}   -2.52d {-02d 31' 25"}
MOON_DIST:       119.44 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:34:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
POINT_ROLL:      158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84229.01 SOD {23:23:49.01} UT,   214.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.265
N_STARS:         108
X_OFFSET:        378 [pixels]
Y_OFFSET:        658 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1617 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00319016000msufc0214.fits
SUN_POSTN:       135.40d {+09h 01m 36s}  +16.93d {+16d 55' 50"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.28d {+11h 49m 06s}   -2.53d {-02d 31' 32"}
MOON_DIST:       119.43 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:35:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84229.01 SOD {23:23:49.01} UT,   214.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239585032
X_OFFSET:        698 [pixels]
Y_OFFSET:        978 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       858
Y_GRB_POS:       1138
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0214.fits
SUN_POSTN:       135.40d {+09h 01m 36s}  +16.93d {+16d 55' 50"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.28d {+11h 49m 07s}   -2.53d {-02d 31' 43"}
MOON_DIST:       119.43 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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:     Mon 04 Aug 08 23:35:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84229.01 SOD {23:23:49.01} UT,   214.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239585032
X_OFFSET:        698 [pixels]
Y_OFFSET:        978 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       858
Y_GRB_POS:       1138
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0214.fits
SUN_POSTN:       135.40d {+09h 01m 36s}  +16.93d {+16d 55' 49"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.28d {+11h 49m 08s}   -2.53d {-02d 31' 50"}
MOON_DIST:       119.43 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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:        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:     Mon 04 Aug 08 23:39:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
POINT_ROLL:      158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84878.52 SOD {23:34:38.52} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.301
N_STARS:         53
X_OFFSET:        378 [pixels]
Y_OFFSET:        658 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1617 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00319016000msufc0863.fits
SUN_POSTN:       135.40d {+09h 01m 37s}  +16.93d {+16d 55' 47"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.32d {+11h 49m 16s}   -2.55d {-02d 32' 50"}
MOON_DIST:       119.40 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:40:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
POINT_ROLL:      158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84878.52 SOD {23:34:38.52} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.301
N_STARS:         53
X_OFFSET:        378 [pixels]
Y_OFFSET:        658 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1617 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00319016000msufc0863.fits
SUN_POSTN:       135.40d {+09h 01m 37s}  +16.93d {+16d 55' 46"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.32d {+11h 49m 17s}   -2.55d {-02d 32' 58"}
MOON_DIST:       119.40 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:41:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84878.52 SOD {23:34:38.52} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239585681
X_OFFSET:        697 [pixels]
Y_OFFSET:        977 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1137
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0863.fits
SUN_POSTN:       135.40d {+09h 01m 37s}  +16.93d {+16d 55' 46"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.33d {+11h 49m 19s}   -2.55d {-02d 33' 10"}
MOON_DIST:       119.39 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:41:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84878.52 SOD {23:34:38.52} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239585681
X_OFFSET:        697 [pixels]
Y_OFFSET:        977 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1137
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0863.fits
SUN_POSTN:       135.40d {+09h 01m 37s}  +16.93d {+16d 55' 45"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.33d {+11h 49m 19s}   -2.56d {-02d 33' 17"}
MOON_DIST:       119.39 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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:     Mon 04 Aug 08 23:40:53 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.6661d {+21h 54m 39.8s} (J2000),
                 328.8093d {+21h 55m 14.2s} (current),
                 327.8290d {+21h 51m 18.9s} (1950)
GRB_DEC:         -53.1852d {-53d 11' 06.7"} (J2000),
                 -53.1443d {-53d 08' 39.5"} (current),
                 -53.4219d {-53d 25' 18.9"} (1950)
GRB_ERROR:       2.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84247.00 SOD {23:24:07.00} UT,   232.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       135.40d {+09h 01m 37s}  +16.93d {+16d 55' 46"}
SUN_DIST:        142.30 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.32d {+11h 49m 18s}   -2.55d {-02d 33' 04"}
MOON_DIST:       119.40 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.89,-48.37 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.26,-37.63 [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:     Mon 04 Aug 08 23:43:07 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     319016,   Seg_Num: 0
GRB_RA:          328.6675d {+21h 54m 40.20s} (J2000),
                 328.8107d {+21h 55m 14.57s} (current),
                 327.8304d {+21h 51m 19.29s} (1950)
GRB_DEC:         -53.1846d {-53d 11' 04.5"} (J2000),
                 -53.1437d {-53d 08' 37.3"} (current),
                 -53.4213d {-53d 25' 16.8"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         16.79 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84014.66 SOD {23:20:14.66} UT,   0.0 [sec] since BAT Trigger Time
SUN_POSTN:       135.41d {+09h 01m 37s}  +16.93d {+16d 55' 44"}
SUN_DIST:        142.30 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.34d {+11h 49m 22s}   -2.56d {-02d 33' 38"}
MOON_DIST:       119.39 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.89,-48.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      310.26,-37.63 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 5.4 arcsec from the XRT position.  
COMMENTS:        E(B-V) of 0.02

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:47:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84984.41 SOD {23:36:24.41} UT,   969.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239585787
X_OFFSET:        697 [pixels]
Y_OFFSET:        977 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1137
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0969.fits
SUN_POSTN:       135.41d {+09h 01m 38s}  +16.93d {+16d 55' 42"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.38d {+11h 49m 31s}   -2.58d {-02d 34' 43"}
MOON_DIST:       119.35 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 04 Aug 08 23:47:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319016,   Seg_Num: 0
POINT_RA:        328.686d {+21h 54m 45s} (J2000)
POINT_DEC:       -53.200d {-53d 12' 00"} (J2000)
ROLL:            158.896d
IMG_START_DATE:  14682 TJD;   217 DOY;   08/08/04
IMG_START_TIME:  84984.41 SOD {23:36:24.41} UT,   969.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239585787
X_OFFSET:        697 [pixels]
Y_OFFSET:        977 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1137
BINNING_INDEX:   1
IM_URL:          sw00319016000msuni0969.fits
SUN_POSTN:       135.41d {+09h 01m 38s}  +16.93d {+16d 55' 41"}
SUN_DIST:        142.28 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:      177.38d {+11h 49m 31s}   -2.58d {-02d 34' 50"}
MOON_DIST:       119.35 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      341.86,-48.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      310.27,-37.65 [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 #8057
J. L. Racusin (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. Pagani (PSU), D. M. Palmer (LANL), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 23:20:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080804 (trigger=319016). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 328.701, -53.195 which is
```
   RA(J2000)  =  21h 54m 48s
   Dec(J2000) = -53d 11' 40"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple overlapping peaks with a duration of about 20 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 23:21:53.7 UT, 99.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 328.66583, -53.18532 which is equivalent to:
```
   RA(J2000)  = 21h 54m 39.80s
   Dec(J2000) = -53d 11' 07.2"
```
with an uncertainty of 3.0 arcseconds (radius, 90% containment). This location is 83 arcseconds from the BAT onboard position, within the BAT error circle.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.63e+20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 5.50e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650 nm) filter starting 109 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at
```
  RA(J2000)  =  21:54:40.2 = 328.6675
  DEC(J2000) = -53:11:05   = -53.18472
```
with a 1-sigma error radius of about 1.0 arc sec. The estimated white magnitude is 16.8 with a 1-sigma error of about 0.5 mag. No correction has been made for a Galactic extinction corresponding to a reddening of 0.02 mag along the line of sight.
Burst Advocate for this burst is J. L. Racusin (racusin AT astro.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #8056
W. Rujopakarn (Steward), E.S. Rykoff (UCSB) report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 080804 (Swift trigger 319016). The first image was at 23:20:34.3 UT, 19.6 s after the burst (6.3 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a 17.2 magnitude, brightening source with coordinates:
21:54:40.1 -53:11:03.8 (J2000), with positional uncertainty of 1" or better
```
start UT    	mag     mlim(of image)
----------------------------------
23:20:50.2     17.2     16.9
```
This source is not visible in DSS (second epoch), 2MASS or the MPChecker database.
A jpeg image is available at http://www.rotse.net/images/gsb319016_3c01_img.jpg Note that the object marked 38 is the candidate in question.
Continuing observations are in progress.
GCN Circular #8058
Christina C. Thoene (DARK/NBI), Antonio de Ugarte Postigo (ESO), PaulM. Vreeswijk, Daniele Malesani (DARK/NBI), Palli Jakobsson (Univ. Hertfordshire) report on behalf of a larger collaboration:
We observed the afterglow of GRB 080804 (Racusin et al., GCN 8057; Rujopakarn & Rykoff, GCN 8056) with the UVES high-resolution spectrograph at the VLT. Observations started on 2008 Aug 5.008 UT (50 min after the GRB). We obtained two spectra with exposure times of 30 and 45 minutes. The spectra cover the wavelength range from 3500 to 9460 Angstroms.
We detect a strong DLA as well as a large range of absorption lines including SiII, SII, OI, CII, AlII, MgI and SiII* from which we derive a redshift of z=2.2045.
We acknowledge excellent support from the observing staff at Paranal, including Swetlana Hubrig, Thomas Rivinius, and Yuri Belestky. We are especially indebted to Swetlana Hubrig and Martin Netopil for using part of their telescope time.
GCN Circular #8064
C. Guidorzi (INAF-OAB) and I. Steele (LJMU) on behalf of a larger collaboration report:
On 2008 August 05 (12:44:12 UT) we began observing the field of GRB 080804 (Racusin et al. GCN Circ. 8057) with the Faulkes Telescope South using the R filter.
In our coadded frame we detect the optical afterglow at the position fully consistent with that reported by Swift-UVOT (Racusin et al. GCN Circ. 8057) and slighly outside the error circle given by ROTSE-III (Rujopakarn et al. GCN Circ. 8056) which is 1.5 arcsec away.
```
Telescope   Filter  T_mid[hr]   Exposure[s]      Mag
-----------------------------------------------------------
FTS         R        14.235       1200         21.6 +/- 0.1
-----------------------------------------------------------
```
The calibration was performed using the R2 magnitudes of several USNOB-1 catalogue field objects. The uncertainty reported above does not include the additional ~0.3 mag of the USNOB-1 catalogue. From the comparison with the value reported by UVOT we infer an average power-law decay index of ~0.7.
GCN Circular #8065
A. Cucchiara, D. B. Fox (Penn State), S. B. Cenko (Caltech) and E. Berger (Harvard U.) report on behalf of a larger collaboration:
Starting at 01:27 UT on 2008 August 5 we observed the optical counterpart of GRB 080804 (Rujopakarn et al., GCN 8056, Racusin et al., GCN 8057) using Gemini-South with GMOS spectrograph (R~1200). We acquired 2x900s spectra which covered the wavelength range 4000A-8000A and 2x900s spectra covering the range 6000A-10000A.
We detect some of the metal absorption features identified by Thoene et al. (GCN 8058), like FeII (1608, 2260), NiII (1741 and 1751) and we also detect MgII doublet (2796,2803). We also detect part of the red wing of the Lyman break indicating a possible DLA associated with the grb host galaxy.
All these features confirm that the grb redshift is z = 2.20.
We thank the Gemini staff for conducting these observations.
GCN Circular #8066
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 6979 s of XRT Photon Counting mode data and 8 UVOT images for GRB 080804, 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 = 328.66755, -53.18483 which is equivalent to:
```
RA (J2000): 21h 54m 40.21s
Dec (J2000): -53d 11' 05.4"
```
with an uncertainty of 1.5 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 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method.
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #8067
C. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), K. McLean (GSFC/UMD), D. Palmer (LANL), J. L. Racusin (PSU), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080804 (trigger #319016) (Racusin, et al., GCN Circ. 8057). The BAT ground-calculated position is RA, Dec = 328.675, -53.189 deg which is
```
   RA(J2000)  =  21h 54m 41.9s 
   Dec(J2000) = -53d 11' 20.2" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 19%.
The mask-weighted light curve shows the main peak starting at ~T-10sec, peaking at ~T+2 sec, and ending at ~T+100 sec. T90 (15-350 keV) is 34 +- 16 sec (estimated error including systematics).
The time-averaged spectrum from T-0.4 to T+62.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.19 +- 0.09. The fluence in the 15-150 keV band is 3.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.57 sec in the 15-150 keV band is 3.1 +- 0.4 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/319016/BA/
GCN Circular #8069
N. P. M. Kuin (MSSL/UCL), and J. L. Racusin (PSU), report on behalf of the Swift UVOT team
The Swift UltraViolet/Optical Telescope (UVOT) began observations of GRB 080804, on August 4, 2008, at 23:21:45 UT, 91 seconds after the initial Swift BAT trigger (Racusin et al., GCN Circ. 8057), and started the finding chart exposure in the white filter at 111 seconds after the trigger.
The refined uvot position of GRB080804 is RA=0328.66750 Dec=-53.18461 deg.(= 21:54:40.2 -53:11:04.6), with an accuracy of 0.4", consistent with the positions reported in GCN Circ. 8056 (Rujokaparn et al.), 8057 (Racusin et al.) and 8066 (Beardmore et al.).
The magnitudes with 1-sigma errors for GRB080804 are given below for the initial observation sequence.
```
Filter Tstart(s) Tstop(s) Exp(s) Magnitude

wh      111        210     98.2    16.83 +/- 0.03
wh      711        720      9.6    18.3  +/- 0.16
v       217        616    393.5    17.17 +/- 0.05
v       752        771     19.4    17.85 +/- 0.30
uvm2    623        642     19.5   >17.6  (3 sigma UL)
uvw1    648        667     19.4   >18.2  (3 sigma UL)
b       697        706      9.6    18.1  +/- 0.27
u       672        691     19.4    17.4  +/- 0.17
uvw2    727        746     19.5   >18.2  (3 sigma UL)

uvw1    648       7442    529.3    20.9  +/- 0.4
uvm2    623       7237    529.4   >20.8  (3 sigma UL)
uvw2    727       6827   1179.5   >21.8  (3 sigma UL)
```
The upper limits in uvw2, uvm2, and weak detection in uvw1 are consistent with the reported redshift of z=2.2045 by Thoene et al. (GCN Circ. 8058).
The values quoted above are on the UVOT Photometric System (Poole et al, 2008, MNRAS 383,627). They are not corrected for the expected galactic reddening of E(B-V) = 0.016 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #8070
J. Racusin, C. Pagani (PSU) report on behalf of the Swift-XRT team:
We have analysed the first five orbits of Swift-XRT data available for GRB 080804 (Racusin et al., GCN 8057) consisting of 123 s of WT mode data, and 11.0 ks of PC mode data. The enhanced XRT position is given in Beardmore et al. (GCN Circ. 8066).
The preliminary 0.3-10.0 keV lightcurve can be fit with a single power-law with a decay index of 1.09+/-0.03.
The WT and PC spectra can be jointly fit with an absorbed power-law with a photon index of 1.6 +/- 0.2. The intrinsic absorption is at a level of 1.7e21 cm^-2 (using z=2.2045, Thoene et al., GCN Circ. 8058), in addition to the Galactic absorption along the line of sight (1.6e20 cm^-2, Kalberla et al. 2005). The average observed (unabsorbed) flux is 2.5e-10 (2.6e-10) ergs cm^-2 s^-1 and 1.2e-11 (1.2e-11) ergs cm^-2 s^-1, for the WT and PC spectra respectively.
Assuming the X-ray emission continues to decline at the same rate, we predict a 0.3-10.0 keV XRT count rate of 0.008 counts/s at T+24hr, which corresponds to an observed flux of 3.4e-13 ergs cm^-2 s^-1.
This Circular is an official product of the Swift-XRT team.
GCN Circular #8073
A.J. van der Horst (NASA/ORAU) and C. Kouveliotou (NASA/MSFC) report:
"We observed the position of the GRB 080804 afterglow at 4.8 and 8.6 GHz with the Australia Telescope Compact Array at August 5 16.92 UT to 22.45 UT, i.e. 0.73 - 0.96 days after the burst (GCN 8057). We do not detect a radio source at the position of the optical afterglow (GCN 8056). The formal flux measurement for a point source at the location of the optical counterpart is -41 +/- 64 microJy at 4.8 GHz, and 40 +/- 63 microJy at 8.6 GHz.
We would like to thank the staff of the Australia Telescope National Facility, in particular Angel Lopez-Sanchez and Philip Edwards, for scheduling and obtaining these Target of Opportunity observations."
GCN Circular #8075
T. Kruehler, F. Schrey, J. Greiner, A. Yoldas, C. Clemens, S. McBreen (all MPE Garching), A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest) report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile), started observations of the field of GRB 080804 (Racusin et al. 2008, GCN #8057) in g'r'i'z'JHK at 23:26 UT, 16 min after the burst. We clearly detect the optical afterglow (Rujopakarn & Rykoff 2008, GCN #8056) in all filters at a position consistent with UVOT (Racusin et al. 2008, GCN #8057) and the Faulkes Telescope South (Guidorzi & Steele, GCN #8064). Observations continued for 65 min and were resumed at 06:30 UT for 30 min.
Assuming the USNO-B1 star at RA(J2000)=328.6627, DEC(J2000)=-53.18288 having R2=18.08 mag, we measure the following r' magnitudes, not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.02 (Schlegel et al. 1998):
```
Filter T_mid    Exposure     Brightness
          (s)         (s)               (mag)
-----------------------------------------
r'      1160       67        18.09 +- 0.03
r'      1565       67        18.37 +- 0.03
r'      1996       115       18.66 +- 0.02
r'      2768       115       18.96 +- 0.02
r'      3672       375       19.25 +- 0.02
r'     26112       375       21.02 +- 0.04
```
The reported magnitudes are a subset of the complete observation consisting of 24 individual frames. The total r band light curve is well fitted by power law with index of 0.87 +- 0.03 between 0.32 h and 7.63 h post burst. This decline is consistent with the Faulkes Telescope South detection (Guidorzi & Steele, GCN #8064) at 14.235 h post burst.
Assuming the optical light curve continues the decline with the same power law index, we predict r' band magnitudes of 22.7 at 2 days and 23.4 at 4 days post burst.
The broad band SED from g' to K can be fitted by a power law with index 0.8 +- 0.1 (statistical) +-0.1 (systematic), where the latter is due to the lack of photometric calibration.
GCN Report 158.1
GCN_Report 158.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_158_1.pdf by J.L. Racusin at PSU titled: "Final results on Swift GRB 080804"

Back to JG's homepage

Jochen Greiner, last update: 20-Aug-2008 [Disclaimer]