Gamma-ray Burst 080905

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

 
TITLE:           GCN/Fermi NOTICE
NOTICE_DATE:     Fri 05 Sep 08 11:59:12 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      40
TRIGGER_NUM:     242308736
GRB_RA:          283.500d {+18h 54m 00s} (J2000),
                 283.627d {+18h 54m 30s} (current),
                 282.771d {+18h 51m 05s} (1950)    
GRB_DEC:         -18.050d {-18d 03' 00"} (J2000),  
                 -18.039d {-18d 02' 18"} (current),
                 -18.113d {-18d 06' 47"} (1950)    
GRB_ERROR:       5.37 [deg radius, statistical only]
GRB_INTEN:       978 [cnts/sec]
TRIGGER_SIGNIF:  124.00 [sigma]
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        43135.00 SOD {11:58:55.00} UT
SOLN_STATUS:     0x0
HARD_RATIO:      0.13
LOC_ALGORITHM:   1 (Flt S/W version number)
MOST_LIKELY:     91%  GRB
2nd_MOST_LIKELY: 85%  SGR_1806n20
DETECTORS:       0,0,0, 1,1,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d34' 02"}        
SUN_DIST:        119.59 [deg]   Sun_angle= -7.9 [hr] (East of Sun)   
MOON_POSTN:      226.58d {+15h 06m 19s}  -22.91d {-22d54' 47"}
MOON_DIST:        53.35 [deg]  
MOON_ILLUM:      31 [%] 
GAL_COORDS:       17.03, -8.67 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      282.87,  4.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 11:59:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     323870,   Seg_Num: 0
GRB_RA:          287.662d {+19h 10m 39s} (J2000),
                 287.789d {+19h 11m 09s} (current),
                 286.930d {+19h 07m 43s} (1950)
GRB_DEC:         -18.877d {-18d 52' 37"} (J2000),
                 -18.862d {-18d 51' 44"} (current),
                 -18.960d {-18d 57' 35"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1855 [cnts]    Image_Peak=102 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   126     E_range: 50-350 keV
BKG_INTEN:       29591 [cnts]
BKG_TIME:        43124.92 SOD {11:58:44.92} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        43134.97 SOD {11:58:54.97} UT
GRB_PHI:          -6.54 [deg]
GRB_THETA:        39.62 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     29.03 [sigma]
IMAGE_SIGNIF:    6.87 [sigma]
MERIT_PARAMS:     +1  +0  +0  -2  +3 +10  +0  +0 +54  +1 
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d 34' 02"}
SUN_DIST:        123.48 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.58d {+15h 06m 19s}  -22.91d {-22d 54' 48"}
MOON_DIST:        56.93 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       17.98,-12.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      286.72,  3.54 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 131.28,-18.02 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/Fermi NOTICE
NOTICE_DATE:     Fri 05 Sep 08 11:59:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      53
TRIGGER_NUM:     242308736
GRB_RA:          286.350d {+19h 05m 24s} (J2000),
                 286.482d {+19h 05m 56s} (current),
                 285.587d {+19h 02m 21s} (1950)    
GRB_DEC:         -24.530d {-24d 31' 47"} (J2000),  
                 -24.516d {-24d 30' 58"} (current),
                 -24.607d {-24d 36' 23"} (1950)    
GRB_ERROR:       16.02 [deg radius, statistical only]
GRB_INTEN:       2300 [cnts]    Peak=27000 [cnts]    
TRIGGER_SIGNIF:  1.19 [sigma]   
DATA_INTERVAL:   0.064 [sec]  
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        43135.00 SOD {11:58:55.00} UT
GRB_PHI:           0.00 [deg]
GRB_THETA:         0.00 [deg]
SOLN_STATUS:     0x0
E_RANGE:         44.032 - 93.777 [keV]
LOC_ALGORITHM:   1 (Gnd S/W Version number)
SC_EARTH_X:      263360 [km]
SC_EARTH_Y:      478064 [km]
SC_EARTH_Z:      -516512 [km]
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d 34' 02"}        
SUN_DIST:        121.66 [deg]   Sun_angle= -8.1 [hr]  (East of Sun)   
MOON_POSTN:      226.59d {+15h 06m 21s}  -22.91d {-22d 54' 53"}
MOON_DIST:        54.42 [deg] 
MOON_ILLUM:      31 [%]
GAL_COORDS:       12.17,-13.80 [deg] galactic lon,lat of the burst (or transient)    
ECL_COORDS:      284.85, -1.93 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.    
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 05 Sep 08 11:59:32 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    5355,   Sub_Num: 0
GRB_INTEN:      9.02 [sigma]   
GRB_TIME:       43135.25 SOD {11:58:55.25} UT
GRB_DATE:       14714 TJD;   249 DOY;   08/09/05
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger. 
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2008-09-05T11-58-55.1415-08806-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 12:03:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     323870,   Seg_Num: 0
GRB_RA:          287.662d {+19h 10m 39s} (J2000),
                 287.789d {+19h 11m 09s} (current),
                 286.930d {+19h 07m 43s} (1950)
GRB_DEC:         -18.877d {-18d 52' 37"} (J2000),
                 -18.862d {-18d 51' 44"} (current),
                 -18.960d {-18d 57' 35"} (1950)
GRB_DATE:        14714 TJD;   249 DOY;   08/09/05
GRB_TIME:        43134.97 SOD {11:58:54.97} UT
TRIGGER_INDEX:   126
GRB_PHI:          -6.54 [deg]
GRB_THETA:        39.62 [deg]
DELTA_TIME:      -44.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     29.03 [sigma]
IMAGE_SIGNIF:    6.87 [sigma]
LC_URL:          sw00323870000msb.lc
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d 33' 59"}
SUN_DIST:        123.47 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.61d {+15h 06m 27s}  -22.92d {-22d 55' 20"}
MOON_DIST:        56.90 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       17.98,-12.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      286.72,  3.54 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 131.28,-18.02 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 12:03:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.867d {-18d 52' 02"} (J2000)
POINT_ROLL:      265.373d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43248.68 SOD {12:00:48.68} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.554
N_STARS:         190
X_OFFSET:        616 [pixels]
Y_OFFSET:        424 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1383 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0113.fits
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d 33' 58"}
SUN_DIST:        123.50 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.62d {+15h 06m 29s}  -22.92d {-22d 55' 26"}
MOON_DIST:        56.92 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:04:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.867d {-18d 52' 02"} (J2000)
POINT_ROLL:      265.373d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43248.68 SOD {12:00:48.68} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.554
N_STARS:         190
X_OFFSET:        616 [pixels]
Y_OFFSET:        424 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1383 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0113.fits
SUN_POSTN:       164.60d {+10h 58m 24s}   +6.57d {+06d 33' 57"}
SUN_DIST:        123.50 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.63d {+15h 06m 30s}  -22.93d {-22d 55' 31"}
MOON_DIST:        56.91 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:05:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.867d {-18d 52' 02"} (J2000)
ROLL:            265.373d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43248.68 SOD {12:00:48.68} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242308851
X_OFFSET:        853 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1013
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0113.fits
SUN_POSTN:       164.60d {+10h 58m 25s}   +6.57d {+06d 33' 56"}
SUN_DIST:        123.50 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.64d {+15h 06m 33s}  -22.93d {-22d 55' 40"}
MOON_DIST:        56.90 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:05:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.867d {-18d 52' 02"} (J2000)
ROLL:            265.373d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43248.68 SOD {12:00:48.68} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242308851
X_OFFSET:        853 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1013
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0113.fits
SUN_POSTN:       164.60d {+10h 58m 25s}   +6.57d {+06d 33' 56"}
SUN_DIST:        123.50 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.64d {+15h 06m 33s}  -22.93d {-22d 55' 41"}
MOON_DIST:        56.90 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:12:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43354.65 SOD {12:02:34.65} UT,   219.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.370
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0219.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 50"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.70d {+15h 06m 47s}  -22.94d {-22d 56' 35"}
MOON_DIST:        56.85 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:12:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43354.65 SOD {12:02:34.65} UT,   219.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.370
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0219.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 49"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.70d {+15h 06m 48s}  -22.94d {-22d 56' 39"}
MOON_DIST:        56.84 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:13:47 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     323870,   Seg_Num: 0
GRB_RA:          287.6736d {+19h 10m 41.6s} (J2000),
                 287.8005d {+19h 11m 12.1s} (current),
                 286.9420d {+19h 07m 46.0s} (1950)
GRB_DEC:         -18.8798d {-18d 52' 47.2"} (J2000),
                 -18.8651d {-18d 51' 54.2"} (current),
                 -18.9626d {-18d 57' 45.4"} (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:  43267.00 SOD {12:01:07.00} UT,   132.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 49"}
SUN_DIST:        123.48 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.71d {+15h 06m 50s}  -22.95d {-22d 56' 46"}
MOON_DIST:        56.82 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       17.98,-12.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      286.73,  3.54 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid  
COMMENTS:        This position was automatically generated on the ground using
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/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 12:14:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43354.65 SOD {12:02:34.65} UT,   219.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242308957
X_OFFSET:        853 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1013
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0219.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 48"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.71d {+15h 06m 50s}  -22.95d {-22d 56' 48"}
MOON_DIST:        56.83 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:14:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  43354.65 SOD {12:02:34.65} UT,   219.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242308957
X_OFFSET:        853 [pixels]
Y_OFFSET:        762 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1013
Y_GRB_POS:       922
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0219.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 48"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.71d {+15h 06m 51s}  -22.95d {-22d 56' 52"}
MOON_DIST:        56.83 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:17:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44004.18 SOD {12:13:24.18} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.452
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0869.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 46"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.74d {+15h 06m 57s}  -22.95d {-22d 57' 13"}
MOON_DIST:        56.81 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:17:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44004.18 SOD {12:13:24.18} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.452
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00323870000msufc0869.fits
SUN_POSTN:       164.61d {+10h 58m 26s}   +6.56d {+06d 33' 45"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.74d {+15h 06m 58s}  -22.96d {-22d 57' 17"}
MOON_DIST:        56.80 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:18:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44004.18 SOD {12:13:24.18} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242309607
X_OFFSET:        852 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0869.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 44"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.75d {+15h 07m 00s}  -22.96d {-22d 57' 25"}
MOON_DIST:        56.80 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 12:18:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44004.18 SOD {12:13:24.18} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     242309607
X_OFFSET:        852 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0869.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 44"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.75d {+15h 07m 00s}  -22.96d {-22d 57' 27"}
MOON_DIST:        56.79 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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:     Fri 05 Sep 08 12:20:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44110.79 SOD {12:15:10.79} UT,   975.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.721
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00323870000msufc0975.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 42"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.77d {+15h 07m 04s}  -22.96d {-22d 57' 43"}
MOON_DIST:        56.78 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:21:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
POINT_ROLL:      265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44110.79 SOD {12:15:10.79} UT,   975.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.721
N_STARS:         190
X_OFFSET:        533 [pixels]
Y_OFFSET:        442 [pixels]
X_MAX:           1492 [pixels]
Y_MAX:           1401 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00323870000msufc0975.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 42"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.77d {+15h 07m 06s}  -22.96d {-22d 57' 49"}
MOON_DIST:        56.77 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 12:22:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44110.79 SOD {12:15:10.79} UT,   975.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242309713
X_OFFSET:        852 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0975.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 41"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.78d {+15h 07m 08s}  -22.97d {-22d 57' 55"}
MOON_DIST:        56.77 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 05 Sep 08 12:22:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     323870,   Seg_Num: 0
POINT_RA:        287.688d {+19h 10m 45s} (J2000)
POINT_DEC:       -18.869d {-18d 52' 06"} (J2000)
ROLL:            265.371d
IMG_START_DATE:  14714 TJD;   249 DOY;   08/09/05
IMG_START_TIME:  44110.79 SOD {12:15:10.79} UT,   975.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     242309713
X_OFFSET:        852 [pixels]
Y_OFFSET:        761 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       921
BINNING_INDEX:   1
IM_URL:          sw00323870000msuni0975.fits
SUN_POSTN:       164.61d {+10h 58m 27s}   +6.56d {+06d 33' 41"}
SUN_DIST:        123.49 [deg]   Sun_angle= -8.2 [hr] (East of Sun)
MOON_POSTN:      226.78d {+15h 07m 08s}  -22.97d {-22d 57' 57"}
MOON_DIST:        56.76 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       18.00,-12.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      286.74,  3.55 [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 #8180
C. Pagani (PSU), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), J. Mao (INAF-OAB), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Preger (ASDC), J. L. Racusin (PSU), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-IASFPA), P. Schady (MSSL-UCL), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), M. C. Stroh (PSU), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 11:58:54 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080905 (trigger=323870). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 287.662, -18.877 which is
```
   RA(J2000) = 19h 10m 39s
   Dec(J2000) = -18d 52' 37"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows 3 peaks with a total duration of about 2 sec. The spectrum is hard, with most response above 25 keV in the BAT energy range. The peak count rate was ~4500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 12:01:05.3 UT, 130.4 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 287.67363, -18.87986 which is equivalent to:
```
   RA(J2000)  = 19h 10m 41.67s
   Dec(J2000) = -18d 52' 47.5"
```
with an uncertainty of 2.8 arcseconds (radius, 90% containment). This location is 40 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 8.95e+20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 114 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma upper limit at the location of the XRT position is 17.8 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.14.
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 #8181
P. Tristram (MOA, Univ. of Canterbury), A.J. Castro-Tirado (IAA-CSIC, Granada), P. Yock (Univ. of Auckland), J. Gorosabel (IAA-CSIC, Granada), A. de Ugarte Postigo (ESO, Santiago), report on behalf of a larger collaboration:
"Following the detection by Swift of GRB 080905 (Pagani et al. GCNC 8180), we have obtained R & I-band images at the 0.6m telescope of the Mt. John Observatory, New Zealand. The images were taken starting on Sep 5.529 UT (i.e. 43 min post-burst).
We do not detect any object brighter than R=20.8 and I=20.3 consistent with the XRT position. We note the presence of two extended R~15 (R~15.4) objects 8.5" (10") South (North-East) (Object A at RA(J2000)=19:10:41.51, DEC(J2000)=-18:52:56.2 and Object B at RA(J2000)=19:10:41.10, DEC(J2000)=-18:52:40.6, respectively) from the XRT position which could be hosting the probably-short GRB 080905. A finding chart can be found at http://www.sc.eso.org/~adeugart/GRB/080905/080905fc.jpg"
GCN Circular #8185
C. Pagani and J. Racusin (PSU) report on behalf of the Swift-XRT team:
We have analyzed the first orbit of Swift-XRT data for the short GRB 080905A (Pagani et al., GCN 8180) beginning at T0+130 seconds to T0+1.1 ks.
The enhanced XRT position given in GCN Circ 8180 is 40 arcseconds from the BAT onboard position, within the BAT error circle.
The XRT lightcurve shows an initial count rate of approximately 6 counts/s for the first 100 seconds of observations, followed by a steep decay and a shallower phase. The decaying lightcurve can be fit with a broken power-law with an initial decay index of 6.4+/-2.0, a break at approximately T0+400 seconds and a later decay index of 1.0+/-0.5.
The spectrum of 1 ks of Photon counting mode data from the first orbit can be fit by an absorbed power-law with a photon index of 1.3+/-0.3 and absorption consistent with the Galactic value along the line of sight (9e20 cm^-2, Kalberla et al. 2005). The average observed (unabsorbed) flux of the PC mode data is 2.9e-9 (3.1e-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 0.001 counts/s at T+24hr, which corresponds to an observed flux of 7e-14 ergs cm^-2 s^-1.
This Circular is an official product of the Swift-XRT team.
GCN Circular #8187
J. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080905A (trigger #323870) (Pagani, et al., GCN Circ. 8180). The BAT ground-calculated position is RA, Dec = 287.663, -18.865 deg, which is
```
   RA(J2000)  =  19h 10m 39.1s 
   Dec(J2000) = -18d 51' 55.4" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%.
The mask-weighted light curve shows three peaks; the first two are partially overlapping, starting at T+0.0 and ending at ~T+0.4 sec. The third peak starts at ~T+0.6 and ends at ~T+1.3 sec. T90 (15-350 keV) is 1.0 +- 0.1 sec (estimated error including systematics).
The time-averaged spectrum from T+0.0 to T+1.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.85 +- 0.24. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/323870/BA/
GCN Circular #8190
D. Malesani (DARK/NBI), A. de Ugarte Postigo (ESO), J. P. U. Fynbo (DARK/NBI), A. J. Levan (Univ. Warwick), E. Rol (Univ. Leicester), N. R. Tanvir (Univ. Leicester), C. C. Thoene (DARK/NBI), J. Telting (NOT), A. Baran (Cracow Univ.), report on behalf of a larger collaboration:
We observed the field of the short GRB 080905A (Pagani et al., GCN 8180) with the NOT and the VLT telescopes equipped with ALFOSC and FORS2, respectively. The NOT observations started on 2008 Sep 5.854 UT (8.51 hr after the GRB) and the total exposure time was 30 min. The VLT observations started on 2008 Sep 6.097 UT (14.3 hr after the GRB) and the total exposure was 40 min. All images were taken with the R filter.
Inside the XRT error circle, we detect a single, faint source with R ~ 24 (against USNO-B1 stars), visible in both the NOT and VLT images. No variability of the source can be robustly determined, hence we cannot assess the relationship of this object with the GRB, especially given the relatively crowded field (Galactic latitude -12.6). Further observations are planned.
The coordinates of this object are:
```
RA(J2000) = 19:10:41.73
Dec(J2000) = -18:52:47.3
```
with an error of ~0.6".
We note that in our NOT images (seeing ~1"), the extended objects identified by Tristram et al. (GCN 8181) appear resolved into several pointlike sources.
Finding charts can be found at the following URL:
http://www.astro.ku.dk/~malesani/GRB/080905A
We acknowledge significant support from the observing staff at Paranal, in particular Swetlana Hubrig, Elena Mason and Andres Pino.
GCN Circular #8195
A. de Ugarte Postigo (ESO), D. Malesani (DARK/NBI), A. J. Levan (Univ. Warwick), J. Hjorth (DARK/NBI), N. R. Tanvir (Univ. Leicester), report on behalf of a larger collaboration:
We observed again the field of the short GRB 080905A (Pagani et al., GCN 8180) with the ESO VLT equipped with FORS2. R-band observations were carried out starting on 2008 Sep 7.004 UT (1.50 days after the GRB) and the total exposure time was 40 minutes.
The object located inside the XRT error circle visible in our early VLT images (Malesani et al., GCN 8190) has clearly faded between the two observations, and is thus likely the optical afterglow of GRB 080905A. We note that this object is located outside the revised 2.2"-radius (90%) UVOT-enhanced XRT error circle (distance from center 4.6"), as provided at http://www.swift.ac.uk/xrt_positions/index.php (value of Sep 7.4 UT).
In our second epoch image, which is deeper and has a better seeing (~0.9"), we also note the presence of a bright extended object, possibly a spiral galaxy, about 9" S, 3" E of the afterglow (partially covered by foreground stars).
Finding charts can be found at
http://www.astro.ku.dk/~malesani/GRB/080905A/#epoch2
We acknowledge significant support from the ESO observing staff at Paranal, in particular Elena Mason, Anders Pino and Swetlana Hubrig.
GCN Circular #8202
H. Nakajima, T. Shimokawabe, Y.A. Mori, Y. Kudou, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We performed optical imaging observation of the field of GRB 080905A (C. Pagani et al. GCN 8180) with the 3-color 50cm MITSuME Telescope at Akeno, Japan from 12:40:12 UT (42min after the trigger) to 14:32:07 UT. In the co-added images of Ic, Rc, and g' bands, we did not detect any afterglow candidate in the XRT error circle. The 3-sigma limiting magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band) stars are following:
```
Filter Start(UT) End(UT)  Exposure   LimitMag
---------------------------------------------------
g'     12:40:12  13:14:31 30 x 60 s  17.1
Rc     12:40:12  13:14:31 30 x 60 s  17.6
Ic     12:40:12  13:14:31 30 x 60 s  17.6
---------------------------------------------------
```
GCN Circular #8203
P.A. Evans, J.P. Osborne and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using more data than were available at the time of de Ugarte Postigo et al. (GCN Circ 8195), the UVOT-enhanced X-ray position of GRB 080905A has been improved to RA, Dec = 287.67390, -18.88022 which is equivalent to:
```
RA (J2000): 19 10 41.74
Dec (J2000): -18 52 48.8
```
with an uncertainty of 1.6 arcsec (90% confidence). This position lies 1.5" from the optical counterpart identified by Malesani et al (GCN Circ. 8190), consistent with that position.
Position enhancement, using the XRT-UVOT alignment and matching to the USNO-B1 catalogue, 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 is an official product of the Swift-XRT team.
GCN Circular #8204
E. Bissaldi, S. McBreen (MPE), V. Connaughton (UAH) and A. von Kienlin (MPE) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 11:58:55 UT on 5 September 2008, the Fermi GBM triggered and located GRB 080905A (trigger 242308736 / 080905499), which was also detected by Swift (Pagani et al., GCN 8180). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 286.3, Dec = -18.2 (J2000 degrees) (equivalent to J2000 19h 05m, -18d 12'), with a statistical uncertainty of 4.6 degree (radius, 1-sigma containment; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). This position is 1.5 deg from the Swift refined position (Evans et al., GCN 8203). The angle from the Fermi LAT boresight to the Swift position is 28 degrees.
This short GRB consists of two peaks, the first from T0 to T0+0.4 sec and the second from T0+0.6 sec to T0+1.1 sec. The first peak shows substructure in agreement with the Swift-BAT refined analysis (J. Cummings et al., GCN 8187). T90 (50-300 keV) is about 1 sec.
The time-averaged spectrum from T0 to T0+1 sec is well fit by a power law function with index -0.96 +/- 0.05. The fluence (50-300 keV) is 2.8(+/-0.2)E-07 erg/cm2 and the peak flux (50-300 keV) is 6.1 +/- 0.8 ph/cm2/s.
The spectral analysis results presented above are preliminary; final results will be published in the Fermi GBM GRB Catalog."
GCN Circular #8208
P. J. Brown and C. Pagani (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080905A starting about 114 s after the BAT detection (Pagani et al., GCN Circ. 8180). We do not detect any source in the revised XRT error circle (Evans et al., GCN Circ. 8203) including the faint optical afterglow seen by Malesani et al. (GCN Circ. 8190) in any of the UVOT filters down to the following 3 sigma upper limits (where T_start and T_stop represent the elapsed time since the BAT trigger in seconds).
```
Filter  T_start(s) T_stop  Exp(s)   MagLimit
white   114        970     198      >21.3
uvw2    730        750     19       >18.1
uvm2    626        4520    95       >19.2
uvw1    651        825     39       >18.8
u       675        850     39       >19.2
b       700        865     15       >18.9
v       220        1250    1014     >20.6
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E(B-V) = 0.14 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).
GCN Report 162.1
GCN_Report 162.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_162_1.pdf by C. Pagani at PSU titled: "Final observations of Swift GRB 080905A"
1006.0487 from 4 Jun 10
A. Rowlinson et al.: Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A
Fynbo, P. Jakobsson, C. Pagani, M. Stamatikos We present the discovery of short GRB 080905A, its optical afterglow and host galaxy. Initially discovered by Swift, our deep optical observations enabled the identification of a faint optical afterglow, and subsequently a face-on spiral host galaxy underlying the GRB position, with a chance alignment probability of <1%. There is no supernova component present in the afterglow to deep limits. Spectroscopy of the galaxy provides a redshift of z=0.1218, the lowest redshift yet observed for a short GRB. The GRB lies offset from the host galaxy centre by ~18.5 kpc, in the northern spiral arm which exhibits an older stellar population than the southern arm. No emission lines are visible directly under the burst position, implying little ongoing star formation at the burst location. These properties would naturally be explained were the progenitor of GRB 080905A a compact binary merger.
1010.1436 from 8 Oct 10
C. W. Akerlof et al.: Searching for Needles in Haystacks - Looking for GRB gamma-rays with the Fermi/LAT Detector
Since the launch of the Fermi~Gamma-ray~Space~Telescope on June 11, 2008, 55 gamma-ray bursts (GRBs) have been observed at coordinates that fall within 66^\circ of the Fermi Large Area Telescope (LAT) boresight with precise localizations provided by the NASA Swift mission or other satellites. Imposing selection cuts to exclude low Galactic latitudes and high zenith angles reduces the sample size to 41. Using matched filter techniques, the Fermi/LAT photon data for these fields have been examined for evidence of bursts that have so far evaded detection at energies above 100 MeV. Following comparisons with similar random background fields, two events, GRB 080905A and GRB 091208B, stand out as excellent candidates for such an identification. After excluding the six bright bursts previously reported by the LAT team, the remaining 35 events exhibit an excess of LAT "diffuse" photons with a statistical significance greater than 2 sigma, independent of the matched filter analysis. After accounting for the total number of photons in the well-localized fields and including estimates of detection efficiency, one concludes that somewhere in the range of 11% to 19% of all GRBs within the LAT field of view illuminate the detector with two or more energetic photons. These are the most stringent estimates of the high energy photon content of GRBs to date. The two new events associated with high energy photon emission have similar ratios of high to low energy fluences as observed previously. This separates them from bursts with similar low energy fluences by a factor of ten, suggesting a distinct class of events rather than a smooth continuum.
1207.4620 from 20 Jul 12
David Gruber et al.: Rest-frame properties of gamma-ray bursts observed by the Fermi Gamma-Ray Burst Monitor
In this talk I present the main spectral and temporal properties of Fermi/GBM gamma-ray bursts (GRBs) with known redshift. Key properties of these GRBs in the rest-frame of the progenitor are investigated to better understand the intrinsic nature of these events. The sample comprises 47 GRBs with measured redshift that were observed by GBM until May 2012. 39 sources belong to the long-duration population and 8 events were classified as short bursts. For all of these events we derive, where possible, the intrinsic peak energy in the {\nu}F{\nu} spectrum (Ep,rest), the duration in the rest-frame, defined as the time in which 90% of the burst counts were observed (T90,rest) and the isotropic equivalent bolometric energy (Eiso). We confirm the tight correlation between Ep,rest and Eiso (Amati relation) with a larger scatter than previously reported. We also confirm the relation between Ep,rest and the 1-s peak luminosity (Lp) (Yonetoku relation). Short GRB 080905A, whose host galaxy was identified at redshift z = 0.1218 is a peculiar outlier of this relation. Moreover, an intriguing, but preliminary, cosmic evolution of Ep,rest was observed, while no such evolution is evident for T90,rest.

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Jochen Greiner, last update: 20-Jul-2012 [Disclaimer]