Gamma-ray Burst 080905B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 16:56:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.723d {+20h 06m 53s} (J2000),
                 301.913d {+20h 07m 39s} (current),
                 300.622d {+20h 02m 29s} (1950)
GRB_DEC:         -62.571d {-62d 34' 15"} (J2000),
                 -62.546d {-62d 32' 43"} (current),
                 -62.715d {-62d 42' 54"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9121 [cnts]    Image_Peak=259 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   271     E_range: 25-100 keV
BKG_INTEN:       86732 [cnts]
BKG_TIME:        60908.92 SOD {16:55:08.92} UT
BKG_DUR:         24 [sec]
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        60945.40 SOD {16:55:45.40} UT
GRB_PHI:         177.71 [deg]
GRB_THETA:        44.76 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.77 [sigma]
IMAGE_SIGNIF:    8.01 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +8  +0  +0 +43  +1 
SUN_POSTN:       164.78d {+10h 59m 08s}   +6.49d {+06d 29' 26"}
SUN_DIST:        115.85 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.18d {+15h 16m 44s}  -23.56d {-23d 33' 52"}
MOON_DIST:        61.30 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      288.77,-41.18 [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 = 85.38,-10.71 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 16:57:59 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.7402d {+20h 06m 57.6s} (J2000),
                 301.9304d {+20h 07m 43.3s} (current),
                 300.6396d {+20h 02m 33.4s} (1950)
GRB_DEC:         -62.5614d {-62d 33' 41.0"} (J2000),
                 -62.5359d {-62d 32' 09.2"} (current),
                 -62.7056d {-62d 42' 20.1"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.11e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.60 [sigma]
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61048.61 SOD {16:57:28.61} UT,   103.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.23 261.36 243.53
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       164.79d {+10h 59m 08s}   +6.49d {+06d 29' 24"}
SUN_DIST:        115.86 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.20d {+15h 16m 48s}  -23.57d {-23d 34' 05"}
MOON_DIST:        61.30 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.06,-32.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.79,-41.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.76 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 16:58:14 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.7402d {+20h 06m 57.6s} (J2000),
                 301.9304d {+20h 07m 43.3s} (current),
                 300.6396d {+20h 02m 33.4s} (1950)
GRB_DEC:         -62.5614d {-62d 33' 41.0"} (J2000),
                 -62.5359d {-62d 32' 09.2"} (current),
                 -62.7056d {-62d 42' 20.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       74 [cnts]
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61048.61 SOD {16:57:28.61} UT,   103.2 [sec] since BAT Trigger Time
CENTROID_X:      330.44,  raw= 330  [pixels]
CENTROID_Y:      301.02,  raw= 301  [pixels]
ROLL:            228.88 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.12
GRB_POS_XRT_Z:   66.34
IMAGE_URL:       sw00323898000msxps_rw.img
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 24"}
SUN_DIST:        115.86 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.20d {+15h 16m 48s}  -23.57d {-23d 34' 07"}
MOON_DIST:        61.30 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.06,-32.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.79,-41.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 16:58:10 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.7402d {+20h 06m 57.6s} (J2000),
                 301.9304d {+20h 07m 43.3s} (current),
                 300.6396d {+20h 02m 33.4s} (1950)
GRB_DEC:         -62.5614d {-62d 33' 41.0"} (J2000),
                 -62.5359d {-62d 32' 09.2"} (current),
                 -62.7056d {-62d 42' 20.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       74 [cnts]
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61048.61 SOD {16:57:28.61} UT,   103.2 [sec] since BAT Trigger Time
CENTROID_X:      330.44,  raw= 330  [pixels]
CENTROID_Y:      301.02,  raw= 301  [pixels]
ROLL:            228.88 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.12
GRB_POS_XRT_Z:   66.34
IMAGE_URL:       sw00323898000msxps_rw.img
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 24"}
SUN_DIST:        115.86 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.20d {+15h 16m 48s}  -23.57d {-23d 34' 07"}
MOON_DIST:        61.30 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.06,-32.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.79,-41.18 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 16:59:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.723d {+20h 06m 53s} (J2000),
                 301.913d {+20h 07m 39s} (current),
                 300.622d {+20h 02m 29s} (1950)
GRB_DEC:         -62.571d {-62d 34' 15"} (J2000),
                 -62.546d {-62d 32' 43"} (current),
                 -62.715d {-62d 42' 54"} (1950)
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        60945.40 SOD {16:55:45.40} UT
TRIGGER_INDEX:   271
GRB_PHI:         177.71 [deg]
GRB_THETA:        44.76 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.77 [sigma]
IMAGE_SIGNIF:    8.01 [sigma]
LC_URL:          sw00323898000msb.lc
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 23"}
SUN_DIST:        115.85 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.21d {+15h 16m 51s}  -23.57d {-23d 34' 16"}
MOON_DIST:        61.28 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      288.77,-41.18 [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 = 85.38,-10.71 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 17:00:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 11"} (J2000)
POINT_ROLL:      228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61058.15 SOD {16:57:38.15} UT,   112.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.381
N_STARS:         190
X_OFFSET:        424 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00323898000msufc0112.fits
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 22"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.23d {+15h 16m 54s}  -23.57d {-23d 34' 28"}
MOON_DIST:        61.26 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.76,-41.18 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 17:01:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 11"} (J2000)
POINT_ROLL:      228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61058.15 SOD {16:57:38.15} UT,   112.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.381
N_STARS:         190
X_OFFSET:        424 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00323898000msufc0112.fits
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 21"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.23d {+15h 16m 55s}  -23.58d {-23d 34' 33"}
MOON_DIST:        61.26 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.76,-41.18 [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 05 Sep 08 17:02:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 11"} (J2000)
ROLL:            228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61058.15 SOD {16:57:38.15} UT,   112.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242326661
X_OFFSET:        673 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00323898000msuni0112.fits
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 20"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.24d {+15h 16m 57s}  -23.58d {-23d 34' 38"}
MOON_DIST:        61.26 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.76,-41.18 [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 05 Sep 08 17:02:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 11"} (J2000)
ROLL:            228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61058.15 SOD {16:57:38.15} UT,   112.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242326661
X_OFFSET:        673 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00323898000msuni0112.fits
SUN_POSTN:       164.79d {+10h 59m 09s}   +6.49d {+06d 29' 20"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.24d {+15h 16m 58s}  -23.58d {-23d 34' 42"}
MOON_DIST:        61.25 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.76,-41.18 [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:     Fri 05 Sep 08 17:09:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 12"} (J2000)
POINT_ROLL:      228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61164.14 SOD {16:59:24.14} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.429
N_STARS:         190
X_OFFSET:        353 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00323898000msufc0218.fits
SUN_POSTN:       164.79d {+10h 59m 10s}   +6.49d {+06d 29' 13"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.30d {+15h 17m 13s}  -23.59d {-23d 35' 35"}
MOON_DIST:        61.21 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.77,-41.18 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 17:10:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 12"} (J2000)
POINT_ROLL:      228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61164.14 SOD {16:59:24.14} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.429
N_STARS:         190
X_OFFSET:        353 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00323898000msufc0218.fits
SUN_POSTN:       164.79d {+10h 59m 10s}   +6.49d {+06d 29' 13"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.31d {+15h 17m 14s}  -23.59d {-23d 35' 40"}
MOON_DIST:        61.21 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.77,-41.18 [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 05 Sep 08 17:10:44 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     323898,   Seg_Num: 0
GRB_RA:          301.7402d {+20h 06m 57.6s} (J2000),
                 301.9304d {+20h 07m 43.3s} (current),
                 300.6395d {+20h 02m 33.4s} (1950)
GRB_DEC:         -62.5634d {-62d 33' 48.2"} (J2000),
                 -62.5379d {-62d 32' 16.4"} (current),
                 -62.7076d {-62d 42' 27.3"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61139.00 SOD {16:58:59.00} UT,   193.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       164.79d {+10h 59m 10s}   +6.49d {+06d 29' 12"}
SUN_DIST:        115.86 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.31d {+15h 17m 15s}  -23.60d {-23d 35' 42"}
MOON_DIST:        61.22 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.06,-32.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.79,-41.18 [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.  
COMMENTS:        This position was enhanced using UVOT field astrometry

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 17:11:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 12"} (J2000)
ROLL:            228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61164.14 SOD {16:59:24.14} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242326767
X_OFFSET:        673 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00323898000msuni0218.fits
SUN_POSTN:       164.79d {+10h 59m 11s}   +6.49d {+06d 29' 12"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.32d {+15h 17m 16s}  -23.60d {-23d 35' 48"}
MOON_DIST:        61.20 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.77,-41.18 [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 05 Sep 08 17:11:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323898,   Seg_Num: 0
POINT_RA:        301.707d {+20h 06m 50s} (J2000)
POINT_DEC:       -62.570d {-62d 34' 12"} (J2000)
ROLL:            228.887d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  61164.14 SOD {16:59:24.14} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242326767
X_OFFSET:        673 [pixels]
Y_OFFSET:        912 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1072
BINNING_INDEX:   1
IM_URL:          sw00323898000msuni0218.fits
SUN_POSTN:       164.79d {+10h 59m 11s}   +6.49d {+06d 29' 11"}
SUN_DIST:        115.84 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      229.32d {+15h 17m 17s}  -23.60d {-23d 35' 51"}
MOON_DIST:        61.20 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      334.05,-32.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.77,-41.18 [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 #8182
M. C. Stroh (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), S. Immler (CRESST/GSFC/UMD), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), B. Preger (ASDC), J. L. Racusin (PSU), T. Sakamoto (NASA/UMBC), P. Schady (MSSL-UCL), R. L. C. Starling (U Leicester) and L. Vetere (PSU) report on behalf of the Swift Team:
At 16:55:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080905B (trigger=323898). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 301.723, -62.571 which is
```
   RA(J2000) = 20h 06m 53s
   Dec(J2000) = -62d 34' 15"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed three well separated peaks each about 10 seconds long with a total burst duration of about 90 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 16:57:28.6 UT, 103.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 301.74027, -62.56347 which is equivalent to:
```
   RA(J2000)  = 20h 06m 57.66s
   Dec(J2000) = -62d 33' 48.5"
```
with an uncertainty of 2.7 arcseconds (radius, 90% containment). This location is 39 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 in excess of the Galactic value (3.49e+20 cm^-2, Kalberla et al. 2005), with an excess column of 1.7 (+1.47/-1.31) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 2.11e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 112 seconds after the BAT trigger. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. Inside the XRT error circle is a 16th mag source that is starlike in the DSS, but appears extended or double in the UVOT image and may be an optical afterglow. A second finding chart in V does not allow us to confirm or reject the candidate at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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 #8188
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), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), M. C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+903 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080905B (trigger #323898) (Stroh, et al., GCN Circ. 8182). The BAT ground-calculated position is RA, Dec = 301.746, -62.568 deg, which is
```
   RA(J2000)  =  20h 06m 59.1s 
   Dec(J2000) = -62d 34' 03.8" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted light curve shows two clusters pf peaks. The first starts at ~T-2 sec and almost returns to background levels as the second cluster starts around T+40 sec. The second cluster returns to background at ~T+220 sec. T90 (15-350 keV) is 128 +- 16 sec (estimated error including systematics).
The time-averaged spectrum from T-15.5 to T+128.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.15. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+8.02 sec in the 15-150 keV band is 0.5 +- 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/323898/BA/
GCN Circular #8189
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 979 s of XRT Photon Counting mode data and 1 UVOT images for GRB 080905B, 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 = 301.74122, -62.56313 which is equivalent to:
```
RA (J2000): 20h 06m 57.89s
Dec (J2000): -62d 33' 47.3"
```
with an uncertainty of 1.7 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 #8191
Paul M. Vreeswijk, Johan P. U. Fynbo, Daniele Malesani, Jens Hjorth (DARK/NBI), Antonio de Ugarte Postigo (ESO), report on behalf of a larger collaboration:
We observed the field of GRB 080905B (Stroh et al., GCN 8182) with the ESO VLT equipped with FORS2. Several spectra were obtained with different grism choices, beginning on 2008 Sep 6.053 UT (8.34 hr after the GRB), and covering the wavelength ranges 3800-9500 AA at low to moderate resolution.
In the acquisition images, we clearly detect a point source inside the refined XRT error circle (Osborne et al., GCN 8189), at the coordinates (J2000):
```
RA = 20:06:57.90
Dec = -62:33:46.8
```
This position is consistent with that of the UVOT candidate afterglow reported by Stroh et al. (GCN 8182), the object being now significantly fainter (R ~ 20.2). We note that this position is 3.8" off the center of the bright 2MASS galaxy 2MASX J20065732-6233465, also visible in the DSS and in the UVOT images.
Spectroscopy of the afterglow reveals resonance absorption features from several ions, including OI, SiII, CIV, FeII, AlII, AlIII, MgII, MgI, at a redshift z = 2.374. The detection of transitions from fine-structure levels of FeII indicates that this is the redshift of the GRB, under the assumption that these levels are populated by GRB afterglow ultraviolet photons. We also find evidence for an intervening absorber at z = 1.438.
We acknowledge excellent support from the Paranal staff, in particular Elena Mason and Andres Pino.
GCN Circular #8192
S. T. Holland (CRESST/USRA/GSFC) & M. C. Stroh (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080905B starting 94 s after the BAT trigger (Stroh et al., 2008, GCNC. 8182). Settled observations started at T + 113 s. We detect the optical afterglow (Stroh et al., GCNC 8182) in the v and white filters at the UVOT-enhanced location of the XRT afterglow (Osborne, et al., 2008, GCNC 8089). There is an uncertain detection in the b filter. The refined UVOT source position is
```
  RA (J2000.0) =  20:06:57.89
Dec (J2000.0) = -62:33:47.0
```
with an estimated uncertainty of 0.7 arcsec (radius, 90% confidence). We note that the afterglow is slightly blended with the USNO-B1.0 star 274-094527, which makes it dificult to confirm the detection in the b band.
Magnitudes and upper limits are reported below.
```
Filter   TSTART   TSTOP     Exposure     Mag   Err  Comment
  white      113     213           98   18.70  0.09
    v        219     619          394   16.60  0.07
    b        699    6033          206   19.49  0.15  uncertain detection
    u        674    5828          216  >20.7         3-sigma upper limit
   uvw1      650    5623          197  >20.3         3-sigma upper limit
   uvm2     5218    5418          197  >19.9         3-sigma upper limit
   uvw2      729    6445          197  >20.5         3-sigma upper limit
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.05 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627). The possible detection in the b filter, coupled with the non-detections in the u, uvw1, uvm2, and uvw2 filters, are consistent with a redshift of approximately z < 3.3. The power-law decay index in the v band between 763 and 6505 s is -0.88.
GCN Circular #8193
M.C. Stroh (PSU) reports on behalf of the Swift-XRT team:
We have analyzed the Swift-XRT data obtained for GRB 080905B (Stroh et al., GCN Circ. 8182), totaling 85s of Windowed Timing and 10.2ks of Photon Counting data.
The 0.3-10 keV X-ray light-curve can be fit by a double broken power- law with an initial decay index of 2.46 +/- 0.18, second decay index of 0.01 +/- 0.18, and a third decay index of 1.41 +/- 0.4 with first and second break points at 258s and 2734s respectively. We predict counting rates of 7.88e-3 cts/s and 4.44e-3 cts/s at T+48 and T+72 hours.
The spectrum from the Windowed Timing data can be fit with a power-law in excess of the Galactic value (3.5e20 cm-2, Kalberla et al. 2005), with an intrinsic column density of 1.32 (+0.57/-0.48)e22 cm^-2 and a photon index of 1.49 (+0.13/-0.12). The observed (unabsorbed) 0.3-10 keV flux is 5.34e-10 (6.1e-10) ergs/cm^2/s.
The spectrum from the Photon Counting data can be fit with a power law with intrinsic column density of 2.26 (+0.53/-0.47)e22 cm^-2 and a photon index of 1.92 (+0.10/-0.10). The observed (unabsorbed) 0.3-10 keV flux is 1.259e-10 (1.7e-10) ergs/cm^2/s.
This is an official product of the Swift-XRT team.
GCN Circular #8205
P. N. Bhat (UAH), W. Paciesas (UAH) and A.J. van der Horst (NASA/ORAU) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 16:55:46 UT on 5 September 2008, the Fermi GBM triggered and located GRB 080905B (trigger 242326547 / 080905705), which was also detected by Swift (Stroh et al., GCN 8182). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 307.1, Dec = -60.2 (J2000 degrees) (equivalent to J2000 20h 28m, -60d 12'), with a statistical uncertainty of 5.7 degree (radius, 1-sigma containment; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight to the GBM localization is 82 degrees.
This long GRB consists of one main peak at trigger time, possibly a weak pre-trigger at T-20 s and second peak at T0 + 70 sec and the third from T0+80 sec to T0+110 sec similar to the Swift light curve.
The burst duration (in the energy range 20-1000 keV) T90 is about 159 sec.
The time-averaged spectrum from T0-20 to T0+110 sec is well fit by a power law function with index -1.75 +/- 0.12.The fluence (20-1000 keV) is 4.1(+/-0.3)E-08 erg/cm2and the peak flux (20-1000 keV) is 0.21 +/- 0.02 ph/cm2/s.
The spectral analysis results presented above are preliminary; final results will be published in the Fermi GBM GRB Catalog."
GCN Circular #8207
John French (UCD School of Physics, DARK/NBI), Gary Melady (UCD School of Physics), Daniele Malesani, Paul Vreeswijk (DARK/NBI) report on behalf of a larger collaboration:
The Watcher 40 cm robotic telescope at Boyden Observatory, South Africa, began imaging the field of GRB 080905B (Stroh et al al. GCN 8182) at 16:56:28 UT, 43 s after the Swift triggger. In a stacked sequence of 10 unfiltered 10 s exposures, with a mid-time of 16:57:37 UT (112 s after the Swift trigger), we detect a point source inside the refined XRT error circle (Osborne et al. GCN 8189), at a position consistent with the detections reported by Holland et al. (GCN 8192) , Vreeswijk et al. (GCN 8191) and Stroh et al. (GCN 8182).
We measure a magnitude of 16.2 +/- 0.2 for the source, based on comparison with the USNO-B1 star at RA 20:06:51.361, Dec -62:32:52.55. Further analysis is ongoing.
GCN Circular #8210
Stephen Holland (CRESST/USRA/GSFC) reports, on behalf of the Swift/UVOT team:
We have performed UVOT photometry on the 2MASS galaxy 2MASX J20065732-6233465 galaxy located 4 arcsec from the optical afterglow of GRB 080905B (Stroh et al., 2008, GCNC 8182). Our magnitudes are:
```
Filter    Mag  Err
    v    17.85 0.05
    b    18.70 0.05
    u    18.46 0.05
  uvw1   18.76 0.07
  uvm2   18.71 0.07
  uvw2   18.76 0.07
```
These magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.05 mag (Schlegel et al., 1998, ApJS, 500, 525) along this line of sight. The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).
The detection in the uvw2 filter implies that the redshift of the 2MASS galaxy can not be greater than approximately z = 1.7. This is inconsistent with the VLT redshift of z = 2.374 for the afterglow (Vreeswijk, et al., 2008, GCNC 8191). This suggests that the 2MASS galaxy is not the host galaxy of GRB 080905B.

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Jochen Greiner, last update: 10-Sep-2008 [Disclaimer]