Gamma-ray Burst 090813

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:10:50 UT
NOTICE_TYPE:     Fermi-GBM Alert 
RECORD_NUM:      1
TRIGGER_NUM:     271829444     
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15042.59 SOD {04:10:42.59} UT
TRIGGER_SIGNIF:  5.9 [sigma]   
TRIGGER_DUR:     0.256 [sec]   
E_RANGE:         3-4 [chan]   47-291 [keV]
ALGORITHM:       8
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,1, 0,0,
COMMENTS:        Fermi-GBM Trigger Alert.
COMMENTS:        This trigger occurred at longitude,latitude = 71.78,19.05 [deg].

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:10:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     359884,   Seg_Num: 0
GRB_RA:          227.017d {+15h 08m 04s} (J2000),
                 225.607d {+15h 02m 26s} (current),
                 235.601d {+15h 42m 24s} (1950)
GRB_DEC:         +88.573d {+88d 34' 21"} (J2000),
                 +88.536d {+88d 32' 08"} (current),
                 +88.749d {+88d 44' 55"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       679 [cnts]    Image_Peak=54 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10427     E_range: 50-350 keV
BKG_INTEN:       22282 [cnts]
BKG_TIME:        15027.00 SOD {04:10:27.00} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15043.00 SOD {04:10:43.00} UT
GRB_PHI:         -56.17 [deg]
GRB_THETA:        41.10 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     32.55 [sigma]
IMAGE_SIGNIF:    7.75 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +3  -2  +0  +0 -25  +0 
SUN_POSTN:       142.96d {+09h 31m 49s}  +14.64d {+14d 38' 14"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:       38.69d {+02h 34m 46s}  +20.57d {+20d 34' 13"}
MOON_DIST:        70.88 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.55, 67.59 [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 = 182.11,12.88 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=271829444).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:11:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     271829444
GRB_RA:           72.100d {+04h 48m 24s} (J2000),
                  74.819d {+04h 59m 17s} (current),
                  59.387d {+03h 57m 33s} (1950)
GRB_DEC:         +88.860d {+88d 51' 36"} (J2000),
                 +88.875d {+88d 52' 31"} (current),
                 +88.743d {+88d 44' 34"} (1950)
GRB_ERROR:       1.30 [deg radius, statistical only]
DATA_SIGNIF:     40.10 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15042.59 SOD {04:10:42.59} UT
GRB_PHI:         143.00 [deg]
GRB_THETA:        34.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       142.96d {+09h 31m 49s}  +14.64d {+14d 38' 14"}
SUN_DIST:         74.95 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       38.70d {+02h 34m 48s}  +20.57d {+20d 34' 21"}
MOON_DIST:        68.52 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      124.03, 26.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.16, 65.47 [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/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:11:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     271829444
GRB_RA:          247.167d {+16h 28m 40s} (J2000),
                 246.907d {+16h 27m 38s} (current),
                 248.544d {+16h 34m 11s} (1950)
GRB_DEC:         +82.667d {+82d 39' 60"} (J2000),
                 +82.646d {+82d 38' 45"} (current),
                 +82.772d {+82d 46' 18"} (1950)
GRB_ERROR:       4.73 [deg radius, statistical plus systematic]
GRB_INTEN:       1360 [cnts/sec]
DATA_SIGNIF:     28.00 [sigma]
INTEG_TIME:      0.256 [sec]
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15042.59 SOD {04:10:42.59} UT
GRB_PHI:         132.98 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 0.2560 [sec]
HARD_RATIO:      0.63
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,1, 0,0,
SUN_POSTN:       142.96d {+09h 31m 49s}  +14.64d {+14d 38' 14"}
SUN_DIST:         77.25 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       38.69d {+02h 34m 46s}  +20.57d {+20d 34' 14"}
MOON_DIST:        75.94 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      115.97, 31.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.81, 73.09 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 71.78,19.05 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:11:10 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     271829444
GRB_RA:          246.867d {+16h 27m 28s} (J2000),
                 246.609d {+16h 26m 26s} (current),
                 248.235d {+16h 32m 56s} (1950)
GRB_DEC:         +82.650d {+82d 39' 00"} (J2000),
                 +82.629d {+82d 37' 44"} (current),
                 +82.756d {+82d 45' 23"} (1950)
GRB_ERROR:       6.33 [deg radius, statistical plus systematic]
GRB_INTEN:       725 [cnts/sec]
DATA_SIGNIF:     30.90 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15042.59 SOD {04:10:42.59} UT
GRB_PHI:         132.98 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.04
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,1, 0,0,
SUN_POSTN:       142.96d {+09h 31m 49s}  +14.64d {+14d 38' 14"}
SUN_DIST:         77.21 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       38.69d {+02h 34m 46s}  +20.57d {+20d 34' 15"}
MOON_DIST:        75.98 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      115.98, 31.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.95, 73.09 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 71.78,19.05 [deg].

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 13 Aug 09 04:11:34 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    5904,   Sub_Num: 0
GRB_INTEN:      10.12 [sigma]  
GRB_TIME:       15040.92 SOD {04:10:40.92} UT
GRB_DATE:       15056 TJD;   225 DOY;   09/08/13
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2009-08/2009-08-13T04-10-40.7045-09988-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:12:58 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     359884,   Seg_Num: 0
GRB_RA:          225.8016d {+15h 03m 12.38s} (J2000),
                 224.4272d {+14h 57m 42.53s} (current),
                 234.2023d {+15h 36m 48.54s} (1950)
GRB_DEC:         +88.5687d {+88d 34' 07.3"} (J2000),
                 +88.5309d {+88d 31' 51.2"} (current),
                 +88.7496d {+88d 44' 58.5"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.26e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.38 [sigma]
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15121.69 SOD {04:12:01.69} UT,   78.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.23 261.54 243.58
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 13"}
SUN_DIST:         75.15 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       38.71d {+02h 34m 50s}  +20.58d {+20d 34' 33"}
MOON_DIST:        70.89 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.05, 28.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       92.62, 67.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.83 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:13:17 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     359884,   Seg_Num: 0
GRB_RA:          225.8016d {+15h 03m 12.3s} (J2000),
                 224.4272d {+14h 57m 42.5s} (current),
                 234.2023d {+15h 36m 48.5s} (1950)
GRB_DEC:         +88.5687d {+88d 34' 07.3"} (J2000),
                 +88.5309d {+88d 31' 51.2"} (current),
                 +88.7496d {+88d 44' 58.5"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       29 [cnts]
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15121.69 SOD {04:12:01.69} UT,   78.7 [sec] since BAT Trigger Time
CENTROID_X:      256.84,  raw= 257  [pixels]
CENTROID_Y:      291.27,  raw= 291  [pixels]
ROLL:            264.41 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -15.86
GRB_POS_XRT_Z:   -107.15
IMAGE_URL:       sw00359884000msxps_rw.img
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 12"}
SUN_DIST:         75.15 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       38.71d {+02h 34m 51s}  +20.58d {+20d 34' 36"}
MOON_DIST:        70.89 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.05, 28.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       92.62, 67.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:13:34 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     359884,   Seg_Num: 0
GRB_RA:          225.8016d {+15h 03m 12.3s} (J2000),
                 224.4272d {+14h 57m 42.5s} (current),
                 234.2023d {+15h 36m 48.5s} (1950)
GRB_DEC:         +88.5687d {+88d 34' 07.3"} (J2000),
                 +88.5309d {+88d 31' 51.2"} (current),
                 +88.7496d {+88d 44' 58.5"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       29 [cnts]
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15121.69 SOD {04:12:01.69} UT,   78.7 [sec] since BAT Trigger Time
CENTROID_X:      256.84,  raw= 257  [pixels]
CENTROID_Y:      291.27,  raw= 291  [pixels]
ROLL:            264.41 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -15.86
GRB_POS_XRT_Z:   -107.15
IMAGE_URL:       sw00359884000msxps_rw.img
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 12"}
SUN_DIST:         75.15 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       38.72d {+02h 34m 52s}  +20.58d {+20d 34' 38"}
MOON_DIST:        70.88 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.05, 28.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       92.62, 67.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:16:05 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     359884,   Seg_Num: 0
GRB_RA:          227.017d {+15h 08m 04s} (J2000),
                 225.607d {+15h 02m 26s} (current),
                 235.601d {+15h 42m 24s} (1950)
GRB_DEC:         +88.573d {+88d 34' 21"} (J2000),
                 +88.536d {+88d 32' 08"} (current),
                 +88.749d {+88d 44' 55"} (1950)
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        15043.15 SOD {04:10:43.15} UT
TRIGGER_INDEX:   10427
GRB_PHI:         -56.17 [deg]
GRB_THETA:        41.10 [deg]
DELTA_TIME:      -13.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     32.55 [sigma]
IMAGE_SIGNIF:    7.75 [sigma]
LC_URL:          sw00359884000msb.lc
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 10"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:       38.74d {+02h 34m 57s}  +20.58d {+20d 35' 03"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.55, 67.59 [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 = 182.11,12.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:17:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        226.965d {+15h 07m 52s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 03"} (J2000)
POINT_ROLL:      264.375d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15130.34 SOD {04:12:10.34} UT,   87.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.768
N_STARS:         43
X_OFFSET:        504 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00359884000msufc0087.fits
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 10"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.75d {+02h 35m 00s}  +20.59d {+20d 35' 12"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:17:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        226.965d {+15h 07m 52s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 03"} (J2000)
ROLL:            264.375d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15130.34 SOD {04:12:10.34} UT,   87.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271829535
X_OFFSET:        1016 [pixels]
Y_OFFSET:        798 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1176
Y_GRB_POS:       958
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0092.fits
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 09"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.76d {+02h 35m 02s}  +20.59d {+20d 35' 20"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:18:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        226.965d {+15h 07m 52s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 03"} (J2000)
ROLL:            264.375d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15130.34 SOD {04:12:10.34} UT,   87.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271829535
X_OFFSET:        1016 [pixels]
Y_OFFSET:        798 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1176
Y_GRB_POS:       958
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0092.fits
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 08"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.76d {+02h 35m 03s}  +20.59d {+20d 35' 27"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:18:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        226.965d {+15h 07m 52s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 03"} (J2000)
POINT_ROLL:      264.375d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15130.34 SOD {04:12:10.34} UT,   87.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.768
N_STARS:         43
X_OFFSET:        504 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00359884000msufc0087.fits
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 09"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.76d {+02h 35m 02s}  +20.59d {+20d 35' 23"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:22:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.083d {+15h 08m 20s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.493d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15342.39 SOD {04:15:42.39} UT,   299.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.633
N_STARS:         47
X_OFFSET:        696 [pixels]
Y_OFFSET:        478 [pixels]
X_MAX:           1655 [pixels]
Y_MAX:           1437 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359884000msufc0299.fits
SUN_POSTN:       142.96d {+09h 31m 51s}  +14.63d {+14d 38' 05"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.80d {+02h 35m 12s}  +20.60d {+20d 36' 06"}
MOON_DIST:        70.86 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:23:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.083d {+15h 08m 20s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.493d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15342.39 SOD {04:15:42.39} UT,   299.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.633
N_STARS:         47
X_OFFSET:        696 [pixels]
Y_OFFSET:        478 [pixels]
X_MAX:           1655 [pixels]
Y_MAX:           1437 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359884000msufc0299.fits
SUN_POSTN:       142.96d {+09h 31m 51s}  +14.63d {+14d 38' 05"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.81d {+02h 35m 14s}  +20.60d {+20d 36' 11"}
MOON_DIST:        70.86 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:24:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.083d {+15h 08m 20s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
ROLL:            264.493d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15342.39 SOD {04:15:42.39} UT,   299.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     271829747
X_OFFSET:        1016 [pixels]
Y_OFFSET:        798 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1176
Y_GRB_POS:       958
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0304.fits
SUN_POSTN:       142.96d {+09h 31m 51s}  +14.63d {+14d 38' 04"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.82d {+02h 35m 16s}  +20.61d {+20d 36' 21"}
MOON_DIST:        70.85 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:17:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        226.965d {+15h 07m 52s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 03"} (J2000)
POINT_ROLL:      264.375d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15130.34 SOD {04:12:10.34} UT,   87.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.768
N_STARS:         43
X_OFFSET:        504 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00359884000msufc0087.fits
SUN_POSTN:       142.96d {+09h 31m 50s}  +14.64d {+14d 38' 10"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.75d {+02h 35m 00s}  +20.59d {+20d 35' 12"}
MOON_DIST:        70.87 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:24:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.083d {+15h 08m 20s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
ROLL:            264.493d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15342.39 SOD {04:15:42.39} UT,   299.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     271829747
X_OFFSET:        1016 [pixels]
Y_OFFSET:        798 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1176
Y_GRB_POS:       958
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0304.fits
SUN_POSTN:       142.96d {+09h 31m 51s}  +14.63d {+14d 38' 04"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.82d {+02h 35m 18s}  +20.61d {+20d 36' 28"}
MOON_DIST:        70.85 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:22:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.083d {+15h 08m 20s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.493d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15342.39 SOD {04:15:42.39} UT,   299.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.633
N_STARS:         47
X_OFFSET:        696 [pixels]
Y_OFFSET:        478 [pixels]
X_MAX:           1655 [pixels]
Y_MAX:           1437 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00359884000msufc0299.fits
SUN_POSTN:       142.96d {+09h 31m 51s}  +14.63d {+14d 38' 05"}
SUN_DIST:         75.18 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.80d {+02h 35m 12s}  +20.60d {+20d 36' 06"}
MOON_DIST:        70.86 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:28:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.094d {+15h 08m 22s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.505d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15921.28 SOD {04:25:21.28} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.677
N_STARS:         190
X_OFFSET:        456 [pixels]
Y_OFFSET:        238 [pixels]
X_MAX:           1895 [pixels]
Y_MAX:           1677 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00359884000msufc0878.fits
SUN_POSTN:       142.97d {+09h 31m 52s}  +14.63d {+14d 38' 01"}
SUN_DIST:         75.19 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.86d {+02h 35m 25s}  +20.62d {+20d 37' 01"}
MOON_DIST:        70.84 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #9781
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), C. Gronwall (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Stamatikos (OSU/NASA/GSFC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 04:10:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090813 (trigger=359884). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 227.017, +88.573 which is
```
   RA(J2000) = 15h 08m 04s
   Dec(J2000) = +88d 34' 21"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks with a duration of about 8 sec. The peak count rate was ~9000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 04:12:01.7 UT, 78.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 225.8016, +88.5687 which is equivalent to:
```
   RA(J2000)  = 15h 03m 12.38s
   Dec(J2000) = +88d 34' 07.3"
```
with an uncertainty of 6.1 arcseconds (radius, 90% containment). This location is 110 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 6.26e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 87 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:28:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.094d {+15h 08m 22s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.505d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15921.28 SOD {04:25:21.28} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.677
N_STARS:         190
X_OFFSET:        456 [pixels]
Y_OFFSET:        238 [pixels]
X_MAX:           1895 [pixels]
Y_MAX:           1677 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00359884000msufc0878.fits
SUN_POSTN:       142.97d {+09h 31m 52s}  +14.63d {+14d 38' 01"}
SUN_DIST:         75.19 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.86d {+02h 35m 25s}  +20.62d {+20d 37' 01"}
MOON_DIST:        70.84 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 13 Aug 09 04:29:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.094d {+15h 08m 22s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
POINT_ROLL:      264.505d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15921.28 SOD {04:25:21.28} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.677
N_STARS:         190
X_OFFSET:        456 [pixels]
Y_OFFSET:        238 [pixels]
X_MAX:           1895 [pixels]
Y_MAX:           1677 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00359884000msufc0878.fits
SUN_POSTN:       142.97d {+09h 31m 52s}  +14.63d {+14d 38' 00"}
SUN_DIST:         75.19 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.86d {+02h 35m 27s}  +20.62d {+20d 37' 07"}
MOON_DIST:        70.84 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:29:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.094d {+15h 08m 22s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
ROLL:            264.505d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15921.28 SOD {04:25:21.28} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271830326
X_OFFSET:        1015 [pixels]
Y_OFFSET:        797 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1175
Y_GRB_POS:       957
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0883.fits
SUN_POSTN:       142.97d {+09h 31m 52s}  +14.63d {+14d 37' 60"}
SUN_DIST:         75.19 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.87d {+02h 35m 28s}  +20.62d {+20d 37' 13"}
MOON_DIST:        70.84 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [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:     Thu 13 Aug 09 04:29:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     359884,   Seg_Num: 0
POINT_RA:        227.094d {+15h 08m 22s} (J2000)
POINT_DEC:       +88.567d {+88d 34' 00"} (J2000)
ROLL:            264.505d
IMG_START_DATE:  15056 TJD;   225 DOY;   09/08/13
IMG_START_TIME:  15921.28 SOD {04:25:21.28} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     271830326
X_OFFSET:        1015 [pixels]
Y_OFFSET:        797 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1175
Y_GRB_POS:       957
BINNING_INDEX:   1
IM_URL:          sw00359884000msuni0883.fits
SUN_POSTN:       142.97d {+09h 31m 52s}  +14.63d {+14d 37' 60"}
SUN_DIST:         75.19 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:       38.87d {+02h 35m 29s}  +20.62d {+20d 37' 16"}
MOON_DIST:        70.84 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      122.02, 28.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       92.56, 67.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #9782
J. Gorosabel, V. Terron, M. Fernandez, P. Kubanek, M. Jelinek, A.J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report;
We have carried out I-band observations of the XRT position of GRB 090813 (GCN 9781) with the 1.23m telescope of Calar Alto. The observations started at 04:18 UT (437 s after the GRB trigger). We detect an object with a rough magnitude of I~17 coincident with the XRT position no present on the DSS. We propose that object as the optical afterglow of GRB 090813.

GCN Notice

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 05:10:30 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     271833016
GRB_RA:          112.100d {+07h 28m 24s} (J2000),
                 112.115d {+07h 28m 27s} (current),
                 112.023d {+07h 28m 06s} (1950)
GRB_DEC:         -65.450d {-65d 27' 00"} (J2000),
                 -65.470d {-65d 28' 12"} (current),
                 -65.345d {-65d 20' 43"} (1950)
GRB_ERROR:       15.25 [deg radius, statistical plus systematic]
GRB_INTEN:       2057 [cnts/sec]
DATA_SIGNIF:     5.30 [sigma]  
INTEG_TIME:      0.016 [sec]   
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        18614.79 SOD {05:10:14.79} UT
GRB_PHI:         345.00 [deg]  
GRB_THETA:       160.00 [deg]  
DATA_TIME_SCALE: 0.0160 [sec]  
HARD_RATIO:      0.04
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB     
2nd_MOST_LIKELY:   2%  Generic SGR
DETECTORS:       1,1,1, 1,1,1, 1,1,0, 1,0,0, 0,0,
SUN_POSTN:       142.99d {+09h 31m 59s}  +14.62d {+14d 37' 29"}
SUN_DIST:         83.39 [deg]   Sun_angle= 2.1 [hr] (West of Sun)
MOON_POSTN:       39.25d {+02h 37m 01s}  +20.73d {+20d 43' 44"}
MOON_DIST:       101.98 [deg]
MOON_ILLUM:      56 [%]
GAL_COORDS:      276.91,-20.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      183.16,-80.99 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.
COMMENTS:        This trigger occurred at longitude,latitude = 278.22,-2.22 [deg].

GCN Notice

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 13 Aug 09 05:11:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     271833016
GRB_RA:          247.160d {+16h 28m 38s} (J2000),
                 246.901d {+16h 27m 36s} (current),
                 248.538d {+16h 34m 09s} (1950)
GRB_DEC:         +82.670d {+82d 40' 12"} (J2000),
                 +82.649d {+82d 38' 57"} (current),
                 +82.775d {+82d 46' 30"} (1950)
GRB_ERROR:       90.00 [deg radius, statistical only]
DATA_SIGNIF:     5.40 [sigma]  
DATA_INTERVAL:   0.016 [sec]   
GRB_DATE:        15056 TJD;   225 DOY;   09/08/13
GRB_TIME:        18614.79 SOD {05:10:14.79} UT
GRB_PHI:           0.00 [deg]  
GRB_THETA:         0.00 [deg]  
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       142.99d {+09h 31m 59s}  +14.62d {+14d 37' 28"}
SUN_DIST:         77.25 [deg]   Sun_angle= -6.9 [hr] (East of Sun)
MOON_POSTN:       39.26d {+02h 37m 02s}  +20.73d {+20d 43' 50"}
MOON_DIST:        75.81 [deg]  
MOON_ILLUM:      56 [%]
GAL_COORDS:      115.97, 31.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.80, 73.09 [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 Circular #9783
S. B. Cenko (Caltech) reports on behalf of a larger collaboration:
We have imaged the field of GRB090813 (Cummings et al., GCN 9781) with the automated Palomar 60 inch telescope. Observations were taken in the Sloan r', i', and z' filters beginning at approximately 4:12 UT (~ 2 minutes after the burst).
Inside the XRT error circle we find a fading point source with coordinates (J2000.0):
```
   RA: 15:03:08.48
   Dec: +88:34:05.5
```
with an estimated error of ~ 0.3" in each coordinate. Presumably this is the same source identified by Gorosabel et al. (GCN 9782).
With reference to several USNO-B1 sources in the field, we measure the following I-band magnitudes for the afterglow:
```
UT (mid-point)     Exposure (s)       Magnitude
----------------------------------------------------------------
04:15:47           60                 17.8
04:20:33           60                 18.2
```
Further observations are planned.
GCN Circular #9784
R.J. Smith, I.A. Steele, Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara), C.G. Mundell, A. Melandri, S. Kobayashi, C.J. Mottram, D.F. Bersier, (Liverpool JMU), A. Gomboc (U. Ljubljana), report on behalf of a large collaboration:
On 2009 August 13 at 04:13:40.8 UT the 2-m Liverpool Telescope automatically began observing the Swift GRB 090813 (Cummings et al., GCN Circ. 9781) using the r' and i' filters. We confirm the detection by Gorosabel et al (GCN 9782) and Cenko et al (GCN 9783) of an optical counterpart to the XRT source. We measure a position of 15:03:05.9 88:34:05.5 J2000 with an uncertainty of 1arcsec and further, confirm the OT is fading. Ths position is 1 arcsec from and therefore conssitent from that reported by Cenko et al (GCN 9783).
```
Mid Time     Delay from BAT   Total Exp  Filter     Mag
(UT)	     trigger (min)      (s)
----------------------------------------------------------
04:13:45.8      3.05		10	R	19.36 +/- 0.13
04:18:11.9      7.48		120	R	19.90 +/- 0.05
04:20:58.2     10.25		120	I	18.11 +/- 0.02
----------------------------------------------------------
```
Both astrometry and photometry is calibrated and quoted with respect to USNO-B.
Further observations are ongoing.
GCN Circular #9785
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 615 s of XRT Photon Counting mode data and 1 UVOT images for GRB 090813, 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 = 225.77887, +88.56795 which is equivalent to:
```
RA (J2000): 15h 03m 6.93s
Dec (J2000): +88d 34' 04.6"
```
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) and Evans et al. (2009, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9786
P. Schady (MSSL-UCL) and J.R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090813 88s after the BAT trigger (Cummings et al., GCN Circ 9781). No new source is detected within the XRT error circle or at the optical position reported by Cenko (GCN Circ. 9783) in any of the individual or combined UVOT filters.
The 3-sigma upper limits of detected a source at the position of the optical afterglow reported by Cenko (GCN Circ. 9783) in the first white band finding chart (fc) observation, and in consecutive coadded observations for each of the UVOT filters are as follows:
```
Filter  T_start(s)  T_stop(s)  Exp(s)  Mag 3-sig UL
wh (fc)    88         237      147       > 20.55
wh         581        1894     264       > 21.35
vv         631        1943     156       > 19.39
bb         556        1869     136       > 20.29
uu         300        2017     382       > 20.44
w1         681        1992     156       > 19.73
m2         656        1967     156       > 19.41
w2         607        1919     156       > 19.83
```
The values quoted above are not corrected for the Galactic extinction due to the large reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al., 1998). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9787
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
GRB 090813 (Swift trigger=359884: Cummings et al., GCN 9781) triggered Konus-Wind at T0=15041.925 s UT (04:10:41.925)
The burst started with a double-peaked structure with a duration of ~2 s. Another, softer peak, with a duration of ~1.5 s, was observed at T0 + 6s.
The Konus-Wind light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090813_T15041/
As observed by Konus-Wind the burst had a fluence of 2.4(-0.4,+0.5)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0, of 3.3(-0.6,+0.7)x10-6 erg/cm2/s (both in the 20 keV - 1 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+8.448 s) is well fitted (in the 20 keV - 1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.37(-0.28,+0.35), and Ep = 104(-23,+41)keV (chi2 = 58/61 dof).
Fitting by GRB (Band) model yields to the same alpha and Ep values with the high energy photon index beta < -9.
The spectrum at the maximum count rate, measured from T0 to T0+0.256 s, is well fitted (in the 20 keV - 1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.85(-0.29,+0.34), and Ep = 195(-43,+71)keV (chi2 = 20/23 dof).
All the quoted values are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #9788
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090813 (trigger #359884) (GRB 090813, Cummings et al., GCN Circ. 9781). The BAT ground-calculated position is RA, Dec = 225.065, 88.571 deg which is
```
RA(J2000) = 15h 00m 15.6s
Dec(J2000) = +88d 34' 15.8"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%.
The mask weighted lightcurve had three main spikes, at T+0, T+1 and T+6.5 sec, each with a duration of about 1 sec. T90 (15-350 keV) was 7.1 +- 0.6 sec (estimated error including systematics). The three spikes were progressively softer.
The time-averaged spectrum from T-0.8 to T+7.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.12. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.04 sec in the 15-150 keV band is 8.5 +- 0.6 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/359884/BA/
GCN Circular #9790
A. P. Beardmore (U. Leicester) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift-XRT team:
We have analysed 8.8 ks of XRT data for GRB 090813 (Cummings et al., GCN Circ. 9781), from 84 s to 19.3 ks after the BAT trigger. The data span four orbits, comprising 810 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 9785).
The X-ray light curve initially follows a shallow decay, with a decay index of 0.22 +/ 0.10, before steepening to an index of 1.15 +/- 0.03 at about 450 s after the trigger.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.10 +/- 0.07. The best-fitting absorption column is (2.23 +0.20 -0.19) x 10^21 cm^-2, in excess of the Galactic value of 6.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.00 +0.11 -0.10 and a best-fitting absorption column of (2.3 +/- 0.3) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (6.4 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.15, the estimated count rate at T+24 hours will be 0.016 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x 10^-13 (1.0x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00359884.
This circular is an official product of the Swift-XRT team.
GCN Circular #9792
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 04:10:42.59 UT on 13 August 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090813 (trigger 271829444 / 090813174), which was also detected by the SWIFT-BAT (Cummings et al. 2009, GCN 9781) and Konus/Wind (Golenetskii et al., 2009, GCN Circular 9787). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 35.3 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of two separate pulses with a duration (T90) of about 9 s (8-1000 keV). The time-averaged spectrum from T0-0.256 s to T0+8.960 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -1.43 +/- 0.08 an the cutoff energy, parameterized as Epeak, is 161 +/- 26 keV (chi squared 495 for 480 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (3.5 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+0.512 s in the 8-1000 keV band is 14.4 +/- 0.5 ph/s/cm^2.
A Band function fits the spectrum equally well (chi squared 492 for 479 d.o.f.) with Epeak= 95 +/- 30 keV, alpha = -1.25 +/- 0.18 and beta = -2.0 +/- 0.1.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #9798
D. Frederiks, on behalf of Konus-Wind team, report:
The correct upper limit for the high energy spectral index (beta) for the GRB (Band) model fit to Konus-Wind time integrated spectrum of GRB 090813 is -2.23 (90% confidence level, 20-1000 keV range).
GCN Circular #9811
A. Volnova (SAI MSU), E. Pavlenko, O. Antoniuk, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 090813 (Cummings et al. GCN 9781) starting (UT) Aug. 13 23:57:26 with Shajn telescope of CrAO under favorable weather condition and seeing ~1.6". At the place of optical afterglow (Gorosabel et al. GCN 9782; Cenko et al. GCN 9783; Smith et al. GCN 9784) we detect a source which appears slightly E-W extended.
Preliminary photometry of the source in a combined image based on USNO-B1.0 star (RA(J2000)=15:02:47.99, Dec(J2000)=88:31:41.4) assuming R= 14.23 is following:
```
T0+     Filter, Exposure, mag.,     err.
(d)             (s)

0.8440   R       57x60     20.50 +/-0.06
```
Observations will be continued.
GCN Circular #9817
GRB 090813: Suzaku WAM observation of the prompt emission
T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Tashiro, A. Endo, K. Onda, T. Sugasahara, W. Iwakiri (Saitama U.), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report
The long, GRB 090813 (Swift/BAT trigger #359884 ; Cummings et al., GCN 9781; Fermi GBM trigger #271829444 ) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 04:10:43.2 UT (=T0). The observed light curve shows a double-peaked structure lasting from T0-0.8s to T0+1.2s followed by a long weak tail seen up to T0+6.8s with a duration (T90) of about 7.6 seconds. The fluence in 100 - 1000 keV was 1.70 (-0.51, +0.61) 10^-6 erg/cm^2. The 1-s peak flux measured from T0-0.2s was 2.77 (-0.40, +0.35) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-0.8s to T0+6.8s is well fitted by a single power-law with a photon index of 1.80 (-0.30, +0.40) (chi^2/d.o.f = 7.6/8). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves for this burst are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #9820
J. Gorosabel (IAA-CSIC), A. de Ugarte Postigo (INAF-OAB), A. Sota (IAA- CSIC), S. Guziy (IAA-CSIC), M. Jelinek (IAA-CSIC), P. Kubanek (IAA- CSIC & IPL Univ. Valencia), A.J. Castro-Tirado (IAA-CSIC), report;
We performed I-band observations of the GRB 090813 optical afterglow (Gorosabel et al. GCN 9782; Cenko et al. GCN 9783; Smith et al. GCN 9784) with the 1.5m telescope of Observatorio de Sierra Nevada. The observations were carried on Aug 13.8979 - 13.9667 UT with a total exposure time of 4950 seconds. No object brigther than I = 21.9 was detected at the afterglow position.
GCN Report 240.1
GCN_Report 240.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_240_1.pdf by J.R. Cummings at GSFC/CRESST titled: "Final Results on Swift GRB 090813"

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Jochen Greiner, last update: 09-Sep-2009 [Disclaimer]