Gamma-ray Burst 080805

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:41:54 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     319036,   Seg_Num: 0
GRB_RA:          314.231d {+20h 56m 55s} (J2000),
                 314.407d {+20h 57m 38s} (current),
                 313.204d {+20h 52m 49s} (1950)
GRB_DEC:         -62.438d {-62d 26' 16"} (J2000),
                 -62.405d {-62d 24' 15"} (current),
                 -62.630d {-62d 37' 48"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4339 [cnts]    Image_Peak=224 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       21910 [cnts]
BKG_TIME:        27677.00 SOD {07:41:17.00} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14683 TJD;   218 DOY;   08/08/05
GRB_TIME:        27694.73 SOD {07:41:34.73} UT
GRB_PHI:         -34.94 [deg]
GRB_THETA:        11.98 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     27.18 [sigma]
IMAGE_SIGNIF:    8.81 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3 +10  +0  +0 +69  +1 
SUN_POSTN:       135.72d {+09h 02m 54s}  +16.84d {+16d 50' 19"}
SUN_DIST:        134.42 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.21d {+12h 04m 51s}   -4.56d {-04d 33' 39"}
MOON_DIST:       104.22 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.12,-38.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      296.17,-42.96 [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 = 298.34,8.05 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:43:05 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     319036,   Seg_Num: 0
GRB_RA:          314.2247d {+20h 56m 53.9s} (J2000),
                 314.4004d {+20h 57m 36.0s} (current),
                 313.1970d {+20h 52m 47.2s} (1950)
GRB_DEC:         -62.4431d {-62d 26' 35.1"} (J2000),
                 -62.4097d {-62d 24' 34.8"} (current),
                 -62.6355d {-62d 38' 07.7"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.09e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.74 [sigma]
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27758.28 SOD {07:42:38.28} UT,   63.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.25 261.35 243.50
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       135.73d {+09h 02m 54s}  +16.84d {+16d 50' 18"}
SUN_DIST:        134.42 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.22d {+12h 04m 53s}   -4.57d {-04d 33' 56"}
MOON_DIST:       104.20 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.11,-38.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.16,-42.96 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:43:15 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     319036,   Seg_Num: 0
GRB_RA:          314.2247d {+20h 56m 53.9s} (J2000),
                 314.4004d {+20h 57m 36.0s} (current),
                 313.1970d {+20h 52m 47.2s} (1950)
GRB_DEC:         -62.4431d {-62d 26' 35.1"} (J2000),
                 -62.4097d {-62d 24' 34.8"} (current),
                 -62.6355d {-62d 38' 07.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27758.28 SOD {07:42:38.28} UT,   63.5 [sec] since BAT Trigger Time
CENTROID_X:      282.97,  raw= 283  [pixels]
CENTROID_Y:      300.26,  raw= 300  [pixels]
ROLL:            182.00 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.34
GRB_POS_XRT_Z:   -45.54
IMAGE_URL:       sw00319036000msxps_rw.img
SUN_POSTN:       135.73d {+09h 02m 54s}  +16.84d {+16d 50' 18"}
SUN_DIST:        134.42 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.22d {+12h 04m 53s}   -4.57d {-04d 33' 59"}
MOON_DIST:       104.20 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.11,-38.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.16,-42.96 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:43:23 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     319036,   Seg_Num: 0
GRB_RA:          314.2247d {+20h 56m 53.9s} (J2000),
                 314.4004d {+20h 57m 36.0s} (current),
                 313.1970d {+20h 52m 47.2s} (1950)
GRB_DEC:         -62.4431d {-62d 26' 35.1"} (J2000),
                 -62.4097d {-62d 24' 34.8"} (current),
                 -62.6355d {-62d 38' 07.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27758.28 SOD {07:42:38.28} UT,   63.5 [sec] since BAT Trigger Time
CENTROID_X:      282.97,  raw= 283  [pixels]
CENTROID_Y:      300.26,  raw= 300  [pixels]
ROLL:            182.00 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.34
GRB_POS_XRT_Z:   -45.54
IMAGE_URL:       sw00319036000msxps_rw.img
SUN_POSTN:       135.73d {+09h 02m 54s}  +16.84d {+16d 50' 18"}
SUN_DIST:        134.42 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.22d {+12h 04m 53s}   -4.57d {-04d 34' 01"}
MOON_DIST:       104.20 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.11,-38.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.16,-42.96 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:45:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.222d {+20h 56m 53s} (J2000)
POINT_DEC:       -62.431d {-62d 25' 49"} (J2000)
POINT_ROLL:      181.996d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27768.57 SOD {07:42:48.57} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.191
N_STARS:         60
X_OFFSET:        561 [pixels]
Y_OFFSET:        505 [pixels]
X_MAX:           1520 [pixels]
Y_MAX:           1464 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00319036000msufc0073.fits
SUN_POSTN:       135.73d {+09h 02m 54s}  +16.84d {+16d 50' 17"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.24d {+12h 04m 57s}   -4.57d {-04d 34' 26"}
MOON_DIST:       104.20 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:45:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.222d {+20h 56m 53s} (J2000)
POINT_DEC:       -62.431d {-62d 25' 49"} (J2000)
POINT_ROLL:      181.996d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27768.57 SOD {07:42:48.57} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.191
N_STARS:         60
X_OFFSET:        561 [pixels]
Y_OFFSET:        505 [pixels]
X_MAX:           1520 [pixels]
Y_MAX:           1464 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00319036000msufc0073.fits
SUN_POSTN:       135.73d {+09h 02m 54s}  +16.84d {+16d 50' 16"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.24d {+12h 04m 58s}   -4.58d {-04d 34' 33"}
MOON_DIST:       104.19 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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:     Tue 05 Aug 08 07:46:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.222d {+20h 56m 53s} (J2000)
POINT_DEC:       -62.431d {-62d 25' 49"} (J2000)
ROLL:            181.996d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27768.57 SOD {07:42:48.57} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239614971
X_OFFSET:        881 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00319036000msuni0073.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 16"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.25d {+12h 04m 59s}   -4.58d {-04d 34' 43"}
MOON_DIST:       104.19 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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:     Tue 05 Aug 08 07:46:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.222d {+20h 56m 53s} (J2000)
POINT_DEC:       -62.431d {-62d 25' 49"} (J2000)
ROLL:            181.996d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27768.57 SOD {07:42:48.57} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     239614971
X_OFFSET:        881 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00319036000msuni0073.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 16"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.25d {+12h 04m 60s}   -4.58d {-04d 34' 50"}
MOON_DIST:       104.19 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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:     Tue 05 Aug 08 07:46:19 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     319036,   Seg_Num: 0
GRB_RA:          314.231d {+20h 56m 55s} (J2000),
                 314.407d {+20h 57m 38s} (current),
                 313.204d {+20h 52m 49s} (1950)
GRB_DEC:         -62.438d {-62d 26' 16"} (J2000),
                 -62.405d {-62d 24' 15"} (current),
                 -62.630d {-62d 37' 48"} (1950)
GRB_DATE:        14683 TJD;   218 DOY;   08/08/05
GRB_TIME:        27694.73 SOD {07:41:34.73} UT
TRIGGER_INDEX:   155
GRB_PHI:         -34.94 [deg]
GRB_THETA:        11.98 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     27.18 [sigma]
IMAGE_SIGNIF:    8.81 [sigma]
LC_URL:          sw00319036000msb.lc
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 16"}
SUN_DIST:        134.42 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.25d {+12h 04m 59s}   -4.58d {-04d 34' 45"}
MOON_DIST:       104.19 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.12,-38.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      296.17,-42.96 [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 = 298.34,8.05 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:47:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.225d {+20h 56m 54s} (J2000)
POINT_DEC:       -62.429d {-62d 25' 45"} (J2000)
POINT_ROLL:      181.992d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27874.42 SOD {07:44:34.42} UT,   179.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.380
N_STARS:         34
X_OFFSET:        561 [pixels]
Y_OFFSET:        505 [pixels]
X_MAX:           1520 [pixels]
Y_MAX:           1464 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00319036000msufc0179.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 15"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.26d {+12h 05m 02s}   -4.59d {-04d 35' 06"}
MOON_DIST:       104.18 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 05 Aug 08 07:48:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.225d {+20h 56m 54s} (J2000)
POINT_DEC:       -62.429d {-62d 25' 45"} (J2000)
POINT_ROLL:      181.992d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27874.42 SOD {07:44:34.42} UT,   179.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.380
N_STARS:         34
X_OFFSET:        561 [pixels]
Y_OFFSET:        505 [pixels]
X_MAX:           1520 [pixels]
Y_MAX:           1464 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00319036000msufc0179.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 15"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.26d {+12h 05m 03s}   -4.59d {-04d 35' 13"}
MOON_DIST:       104.18 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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:     Tue 05 Aug 08 07:48:51 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.225d {+20h 56m 54s} (J2000)
POINT_DEC:       -62.429d {-62d 25' 45"} (J2000)
ROLL:            181.992d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27874.42 SOD {07:44:34.42} UT,   179.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239615077
X_OFFSET:        881 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00319036000msuni0179.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 14"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.27d {+12h 05m 04s}   -4.59d {-04d 35' 22"}
MOON_DIST:       104.17 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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:     Tue 05 Aug 08 07:49:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     319036,   Seg_Num: 0
POINT_RA:        314.225d {+20h 56m 54s} (J2000)
POINT_DEC:       -62.429d {-62d 25' 45"} (J2000)
ROLL:            181.992d
IMG_START_DATE:  14683 TJD;   218 DOY;   08/08/05
IMG_START_TIME:  27874.42 SOD {07:44:34.42} UT,   179.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     239615077
X_OFFSET:        881 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1041
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00319036000msuni0179.fits
SUN_POSTN:       135.73d {+09h 02m 55s}  +16.84d {+16d 50' 14"}
SUN_DIST:        134.43 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      181.27d {+12h 05m 05s}   -4.59d {-04d 35' 30"}
MOON_DIST:       104.17 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      333.13,-38.21 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.17,-42.95 [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 Circular #8059
C. Pagani (PSU), W. H. Baumgartner (GSFC/UMBC), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester), D. Grupe (PSU), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), J. Mao (INAF-OAB), A. Moretti (INAF-OAB), K. L. Page (U Leicester), D. M. Palmer (LANL), J. L. Racusin (PSU), P. Romano (INAF-IASFPA) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 07:41:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080805 (trigger=319036). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 314.231, -62.438 which is
```
   RA(J2000) = 20h 56m 55s
   Dec(J2000) = -62d 26' 16"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-like structure with a duration of about 50 sec. The peak count rate was ~2600 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 07:42:38.3 UT, 63.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading uncatalogued X-ray source located at RA, Dec 314.22273, -62.44433 which is equivalent to:
```
   RA(J2000)  = 20h 56m 53.46s
   Dec(J2000) = -62d 26' 39.6"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This position is 26.6 arcseconds from the BAT 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 3.45e+20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 74 seconds after the BAT trigger. No afterglow candidate is apparent in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle and 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.043.
Burst Advocate for this burst is C. Pagani (pagani 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 #8060
T. Kruehler, F. Schrey, J. Greiner, C. Clemens, A. Yoldas (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 080805 (Pagani et al. 2008, GCN #8059) in g'r'i'z'JHK at 07:45 UT, 3.5 min after the burst. We detect an optical/NIR afterglow candidate in the XRT error circle (Pagani et al. 2008, GCN #8059) in griz at:
```
RA(J2000): 20h 56m 53.44
DEC(J2000): -62d 26' 39.8"
```
with uncertainties of 0.5".
We measure the following magnitudes, calibrated against USNO-B1 field stars:
```
g = 21.7 +- 0.2
r = 20.5 +- 0.1
i = 20.1 +- 0.1
z = 19.9 +- 0.1
```
No statement about fading can be made at the moment. If this is the afterglow of GRB 080805, then its redshift is smaller than 3.5.
GCN Circular #8061
A. de Ugarte Postigo (ESO), D. Malesani, P. M. Vreeswijk, J.P.U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Hertfordshire), A.O. Jaunsen (Univ. Oslo), J. Sollerman (DARK/NBI and Univ. Stockholm), report:
We observed the field of GRB 080805 (Pagani et al., GCN 8059) with the ESO VLT equipped with FORS2. We clearly identify the candidate afterglow first reported by Kruehler et al. (GCN 8060). From the first image, obtained at 07:50:49 UT (9.3 min after the burst) to 10:00:05 UT (138.5 min after the burst) the object faded by 2.0 magnitudes in the R band. We thus consider the afterglow candidate to be secure.
We acknowledge excellent support from the observing staff at Paranal, especially to Patricia Guajardo and Yuri Belestky.
GCN Circular #8062
P. Jakobsson (U. Hertfordshire), P. M. Vreeswijk (DARK/NBI), A. de Ugarte Postigo (ESO), D. Malesani, J. P. U. Fynbo (DARK/NBI) and J. Sollerman (DARK/NBI; U. Stockholm) report on behalf of a larger collaboration:
Using FORS2 on the ESO Very Large Telescope, we have obtained low and medium resolution spectra (grisms 300V, 1200R and 1400V) of the optical afterglow of GRB 080805 (Kruehler et al., GCN 8060; de Ugarte Postigo et al., GCN 8061). The first spectrum was taken approximately an hour after the burst.
A firm upper limit of z < 2.2 can be placed on the redshift of GRB 080805 from the lack of Ly-alpha forest lines in the spectrum of the afterglow. This is consistent with the GROND observations (Kruehler et al).
The spectra display Fe II (2344,2382,2600) and the Mg II doublet (2796,2803) in absorption corresponding to a redshift of z = 1.20. There is also tentative evidence of an absorption system at z = 1.50 (Fe II and Mg II), but further analysis is required to confirm the reality of this system.
We thank the Paranal staff for excellent support, especially Patricia Guajardo and Yuri Belestky.
GCN Circular #8063
M.Cwiok, W.Dominik, G.Kasprowicz, A.Majcher, A.Majczyna, K.Malek, L.Mankiewicz, M.Molak, K.Nawrocki, L.W.Piotrowski, D.Rybka, M.Sokolowski, J.Uzycki, G.Wrochna, A.F.Zarnecki on behalf of "Pi of the Sky" collaboration http://grb.fuw.edu.pl
"Pi of the Sky" apparatus observed the position of GRB080805. Three 10s images of this field have been taken at 07:37:45 - 07:38:42 ( 3 minutes before the GRB). No new object is seen within the error box and the limit is 12.5 magnitudo.
After receiving the trigger from SWIFT, the field was observed 84s after the GRB. No new object has been found within the Swift-BAT error box. The limiting magnitude (unfiltered) on single 10s exposures is :
```
         07:42:58 - 07:43:08 - 12.2 mag
         07:43:11 - 07:43:21 - 12.2 mag
         07:43:24 - 07:43:34 - 12.2 mag
```
and 12.5 mag on 20 coadded images.
GCN Circular #8068
D. Palmer (LANL), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), C. Pagani (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+302 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080805 (trigger #319036) (Pagani, et al., GCN Circ. 8059). The BAT ground-calculated position is RA, Dec = 314.231, -62.433 deg, which is
```
   RA(J2000)  =  20h 56m 55.3s 
   Dec(J2000) = -62d 25' 58.8" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a FRED-like peak starting at ~T-5sec, peaking at ~T+3 sec, and ending at ~T+140 sec. T90 (15-350 keV) is 78 +- 7 sec (estimated error including systematics).
The time-averaged spectrum from T-6.1 to T+93.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.53 +- 0.07. The fluence in the 15-150 keV band is 2.5 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.62 sec in the 15-150 keV band is 1.1 +- 0.1 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/319036/BA/
GCN Circular #8071
P. Ward (MSSL-UCL) and C. Pagani (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080805 starting 74 s after the BAT trigger (Pagani et al., GCN Circ. 8059). We do not find a source in any of the UVOT observations inside the XRT error circle or at the position reported by Kruehler et al. (GCN 8060). The 3-sigma upper limits for detecting a source are:
```
Filter   T_start T_stop   Exp   Mag

White    76      175      98.5  > 20.70
White    5473    18024    1082  > 22.12
v        182     6083     332   > 19.81
b        5268    17112    1082  > 21.43
u        5061    5260     197   > 20.11
uvw1     4856    5055     197   > 19.99
uvm2     4650    6267     371   > 20.09
uvw2     5680    18053    219   > 20.12
```
The values quoted above are in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627). No correction has been made for the expected extinction corresponding to E(B-V) of 0.043 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #8072
C. Pagani, J. Racusin and D. Grupe (PSU) report on behalf of the Swift-XRT team:
We have analysed the first four orbits of Swift-XRT data for GRB 080805 (Pagani et al., GCN 8059) beginning at T0+71 s until T0+23.1 ks.
Using 728 s of XRT Photon Counting mode data and 2 UVOT images, 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 = 314.22312, -62.44479 which is equivalent to:
```
RA (J2000):  20 56 53.55
Dec (J2000): -62 26 41.2
```
with an uncertainty of 2.6 arcsec (radius, 90% confidence).
The XRT lightcurve shows an initial flare and a steep decay followed by a shallower phase. The decaying lightcurve can be fit with a broken power-law with an initial decay index of 3.5+/-0.3, a break at approximately T0+500 seconds and a later decay index of 0.9+/-0.3.
The spectrum of the Windowed Timing mode data from the first orbit can be fit by an absorbed power-law with a photon index of 1.3+/-0.1 and absorption consistent with the Galactic value along the line of sight (3.5e20 cm^-2, Kalberla et al. 2005). The average observed (unabsorbed) flux of the WT mode data is 1.7e-9 (1.9e-10) ergs cm^-2 s^-1.
Assuming the X-ray emission continues to decline at the same rate, we predict a 0.3-10.0 keV XRT count rate of 0.003 counts/s at T+24hr, which corresponds to an observed flux of 1.5e-13 ergs cm^-2 s^-1.
This Circular is an official product of the Swift-XRT team.
GCN Circular #8076
C. Guidorzi (INAF-OAB), I. Steele and R.J. Smith (LJMU) on behalf of a larger collaboration report:
On 2008 August 05 (10:12:35 UT) we began observing the field of GRB 080805 (Pagani et al. GCN Circ. 8059) with the Faulkes Telescope South using the R and i' filters.
In our coadded i' frame we marginally detect the optical afterglow (Kruehler et al. GCN Circ. 8060; de Ugarte Postigo et al. GCN Circ. 8061):
```
Telescope   Filter  T_mid[hr]   Exposure[s]      Mag
-----------------------------------------------------------
FTS         i'         5.410       6x300       22.5 +/- 0.4
-----------------------------------------------------------
```
The calibration was performed using the I magnitudes of several USNOB-1 catalogue field objects. From the comparison with the value reported by GROND (Kruehler et al. GCN Circ. 8060) we estimate an average power-law decay index of ~0.7, consistent with that inferred in the R band (de Ugarte Postigo et al. GCN Circ. 8061).
GCN Circular #8077
P. Jakobsson (U. Hertfordshire), J. P. U. Fynbo, P. M. Vreeswijk (DARK/NBI) and A. de Ugarte Postigo (ESO) report on behalf of a larger collaboration:
We have reduced the VLT spectra presented in Jakobsson et al. (GCN 8062) with new calibration files and performed a thorough line search in all four grisms (300V, 1028z, 1200R, 1400V) covering approximately 3700-9500 A. We confirm the existence of a line system at redshift z = 1.505 +/- 0.001 displaying Fe II (2382,2586,2600), the Mg II doublet (2796,2803) and Mg I (2852). In addition, there is a clear bump (flux decrease) present between 5300-5600 A that can be interpreted as the 2175 A extinction feature at z ~ 1.5.
Apart from the z = 1.20 redshift system presented in GCN 8062, no other significant lines are visible. We therefore conclude that z = 1.505 is the redshift of GRB 080805.
GCN Report 159.1
GCN_Report 159.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_159_1.pdf by C. Pagani at PSU titled: "Final results on Swift GRB 080805"
1205.0387 from 3 May 12
Tayyaba Zafar et al.: The properties of the 2175AA extinction feature discovered in GRB afterglows
Giorgos Leloudas (1), Pall Jakobsson (4), Christina C. Thone (5), Daniel A. Perley (6), Adam N. Morgan (6), Joshua Bloom (6), Jochen Greiner (3) ((1) DARK, (2) LAM, (3) MPI, (4) Univ. of Iceland (5) Univ. of California) The unequivocal, spectroscopic detection of the 2175 bump in extinction curves outside the Local Group is rare. To date, the properties of the bump have been examined in only two GRB afterglows (GRB 070802 and GRB 080607). In this work we analyse in detail the detections of the 2175 extinction bump in the optical spectra of the two further GRB afterglows: GRB 080605 and 080805. We gather all available optical/NIR photometric, spectroscopic and X-ray data to construct multi-epoch SEDs for both GRB afterglows. We fit the SEDs with the Fitzpatrick & Massa (1990) model with a single or broken PL. We also fit a sample of 38 GRB afterglows, known to prefer a SMC-type extinction curve, with the same model. We find that the SEDs of GRB 080605 and GRB 080805 at two epochs are fit well with a single PL with a derived extinction of A_V = 0.52(+0.13 -0.16) and 0.50 (+0.13 -0.10), and 2.1(+0.7-0.6) and 1.5+/-0.2 respectively. While the slope of the extinction curve of GRB 080805 is not well-constrained, the extinction curve of GRB 080605 has an unusual very steep far-UV rise together with the 2175 bump. Such an extinction curve has previously been found in only a small handful of sightlines in the MW. One possible explanation of such an extinction curve may be dust arising from two different regions with two separate grain populations, however we cannot distinguish the origin of the curve. We finally compare the four 2175 bump sightlines to the larger GRB afterglow sample and to Local Group sightlines. We find that while the width and central positions of the bumps are consistent with what is observed in the Local Group, the relative strength of the detected bump (A_bump) for GRB afterglows is weaker for a given A_V than for almost any Local Group sightline. Such dilution of the bump strength may offer tentative support to a dual dust-population scenario.

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Jochen Greiner, last update: 03-May-2012 [Disclaimer]