Gamma-ray Burst 090926B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:04:40 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.318d {+03h 05m 16s} (J2000),
                  46.411d {+03h 05m 39s} (current),
                  45.840d {+03h 03m 22s} (1950)
GRB_DEC:         -39.011d {-39d 00' 40"} (J2000),
                 -38.974d {-38d 58' 25"} (current),
                 -39.204d {-39d 12' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5385 [cnts]    Image_Peak=156 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   147     E_range: 25-100 keV
BKG_INTEN:       34690 [cnts]
BKG_TIME:        78930.88 SOD {21:55:30.88} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78948.41 SOD {21:55:48.41} UT
GRB_PHI:         144.29 [deg]
GRB_THETA:        40.07 [deg]
SOLN_STATUS:     0x20000083
RATE_SIGNIF:     14.69 [sigma]
IMAGE_SIGNIF:    6.74 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 +55  +0 
SUN_POSTN:       183.62d {+12h 14m 28s}   -1.57d {-01d 33' 59"}
SUN_DIST:        123.58 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.12d {+18h 52m 28s}  -24.33d {-24d 19' 49"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       26.29,-53.23 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 19.29,15.78 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(20.0<100sec) coincident with the FERMI_GBM event (trignum=275694930).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 26 Sep 09 21:55:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     275694930
GRB_RA:           38.200d {+02h 32m 48s} (J2000),
                  38.305d {+02h 33m 13s} (current),
                  37.663d {+02h 30m 39s} (1950)
GRB_DEC:         -31.017d {-31d 00' 59"} (J2000),
                 -30.974d {-30d 58' 26"} (current),
                 -31.236d {-31d 14' 09"} (1950)
GRB_ERROR:       30.65 [deg radius, statistical plus systematic]
GRB_INTEN:       120 [cnts/sec]
DATA_SIGNIF:     5.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         215.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.68
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 50"}
SUN_DIST:        133.68 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 09s}  -24.34d {-24d 20' 35"}
MOON_DIST:        96.97 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      228.97,-67.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.67,-43.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 77.08,13.83 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 26 Sep 09 21:56:01 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     275694930
GRB_RA:           49.110d {+03h 16m 26s} (J2000),
                  49.201d {+03h 16m 48s} (current),
                  48.641d {+03h 14m 34s} (1950)
GRB_DEC:         -39.240d {-39d 14' 23"} (J2000),
                 -39.205d {-39d 12' 15"} (current),
                 -39.423d {-39d 25' 22"} (1950)
GRB_ERROR:       10.38 [deg radius, statistical only]
DATA_SIGNIF:     10.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         222.00 [deg]
GRB_THETA:       100.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 50"}
SUN_DIST:        121.66 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 10s}  -24.34d {-24d 20' 34"}
MOON_DIST:        98.98 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.21,-57.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.39,-54.42 [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:     Sat 26 Sep 09 21:55:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     275694930
GRB_RA:           30.550d {+02h 02m 12s} (J2000),
                  30.654d {+02h 02m 37s} (current),
                  30.015d {+02h 00m 04s} (1950)
GRB_DEC:         -36.800d {-36d 47' 59"} (J2000),
                 -36.753d {-36d 45' 11"} (current),
                 -37.040d {-37d 02' 24"} (1950)
GRB_ERROR:       17.55 [deg radius, statistical plus systematic]
GRB_INTEN:       102 [cnts/sec]
DATA_SIGNIF:     8.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         208.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.52
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 50"}
SUN_DIST:        134.19 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 09s}  -24.34d {-24d 20' 35"}
MOON_DIST:        88.52 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      250.22,-72.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       11.09,-45.36 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 77.08,13.83 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 26 Sep 09 21:56:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      68
TRIGGER_NUM:     275694930
GRB_RA:           24.083d {+01h 36m 20s} (J2000),
                  24.191d {+01h 36m 46s} (current),
                  23.527d {+01h 34m 07s} (1950)
GRB_DEC:         -36.833d {-36d 49' 59"} (J2000),
                 -36.784d {-36d 47' 01"} (current),
                 -37.088d {-37d 05' 16"} (1950)
GRB_ERROR:       13.02 [deg radius, statistical plus systematic]
GRB_INTEN:       136 [cnts/sec]
DATA_SIGNIF:     12.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         203.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.12
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 51"}
SUN_DIST:        137.15 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 10s}  -24.34d {-24d 20' 34"}
MOON_DIST:        83.93 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      261.35,-76.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        4.79,-42.84 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 77.08,13.83 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 26 Sep 09 21:56:12 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      72
TRIGGER_NUM:     275694930
GRB_RA:           26.200d {+01h 44m 48s} (J2000),
                  26.310d {+01h 45m 14s} (current),
                  25.635d {+01h 42m 32s} (1950)
GRB_DEC:         -31.667d {-31d 39' 59"} (J2000),
                 -31.618d {-31d 37' 04"} (current),
                 -31.917d {-31d 55' 00"} (1950)
GRB_ERROR:       9.50 [deg radius, statistical plus systematic]
GRB_INTEN:       189 [cnts/sec]
DATA_SIGNIF:     15.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         205.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.95
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 51"}
SUN_DIST:        140.44 [deg]   Sun_angle= 10.5 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 10s}  -24.34d {-24d 20' 33"}
MOON_DIST:        87.82 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      237.46,-77.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.09,-39.13 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 77.08,13.83 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 26 Sep 09 21:56:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     275694930
GRB_RA:           39.480d {+02h 37m 55s} (J2000),
                  39.573d {+02h 38m 17s} (current),
                  39.004d {+02h 36m 01s} (1950)
GRB_DEC:         -42.920d {-42d 55' 11"} (J2000),
                 -42.878d {-42d 52' 40"} (current),
                 -43.136d {-43d 08' 07"} (1950)
GRB_ERROR:       10.55 [deg radius, statistical only]
DATA_SIGNIF:     10.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         214.00 [deg]
GRB_THETA:       102.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 51"}
SUN_DIST:        125.05 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 10s}  -24.34d {-24d 20' 34"}
MOON_DIST:        91.02 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      256.08,-63.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       15.46,-54.10 [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:     Sat 26 Sep 09 21:56:16 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      70
TRIGGER_NUM:     275694930
GRB_RA:           20.330d {+01h 21m 19s} (J2000),
                  20.437d {+01h 21m 45s} (current),
                  19.778d {+01h 19m 07s} (1950)
GRB_DEC:         -42.880d {-42d 52' 47"} (J2000),
                 -42.829d {-42d 49' 44"} (current),
                 -43.142d {-43d 08' 28"} (1950)
GRB_ERROR:       6.33 [deg radius, statistical only]
DATA_SIGNIF:     12.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         200.00 [deg]
GRB_THETA:       101.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 51"}
SUN_DIST:        133.09 [deg]   Sun_angle= 10.9 [hr] (West of Sun)
MOON_POSTN:      283.04d {+18h 52m 10s}  -24.34d {-24d 20' 33"}
MOON_DIST:        78.80 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      283.78,-73.12 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      356.91,-46.52 [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:     Sat 26 Sep 09 21:56:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      71
TRIGGER_NUM:     275694930
GRB_RA:           18.870d {+01h 15m 29s} (J2000),
                  18.978d {+01h 15m 55s} (current),
                  18.315d {+01h 13m 16s} (1950)
GRB_DEC:         -43.760d {-43d 45' 35"} (J2000),
                 -43.709d {-43d 42' 30"} (current),
                 -44.024d {-44d 01' 25"} (1950)
GRB_ERROR:       3.96 [deg radius, statistical only]
DATA_SIGNIF:     19.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78928.53 SOD {21:55:28.53} UT
GRB_PHI:         199.00 [deg]
GRB_THETA:       102.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       183.61d {+12h 14m 27s}   -1.56d {-01d 33' 51"}
SUN_DIST:        132.68 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      283.05d {+18h 52m 11s}  -24.34d {-24d 20' 31"}
MOON_DIST:        77.48 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      288.22,-72.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      354.92,-46.68 [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/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:05:19 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.3067d {+03h 05m 13.60s} (J2000),
                  46.3997d {+03h 05m 35.92s} (current),
                  45.8291d {+03h 03m 18.99s} (1950)
GRB_DEC:         -39.0062d {-39d 00' 22.3"} (J2000),
                 -38.9688d {-38d 58' 07.6"} (current),
                 -39.1994d {-39d 11' 57.6"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.15e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.19 [sigma]
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79036.76 SOD {21:57:16.76} UT,   88.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.21 261.38 243.60
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       183.62d {+12h 14m 28s}   -1.57d {-01d 34' 00"}
SUN_DIST:        123.59 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.12d {+18h 52m 30s}  -24.33d {-24d 19' 46"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.78 [deg] galactic lon,lat of the burst
ECL_COORDS:       26.29,-53.22 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.60 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:05:29 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.3067d {+03h 05m 13.6s} (J2000),
                  46.3997d {+03h 05m 35.9s} (current),
                  45.8291d {+03h 03m 18.9s} (1950)
GRB_DEC:         -39.0062d {-39d 00' 22.3"} (J2000),
                 -38.9688d {-38d 58' 07.6"} (current),
                 -39.1994d {-39d 11' 57.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       104 [cnts]
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79036.76 SOD {21:57:16.76} UT,   88.3 [sec] since BAT Trigger Time
CENTROID_X:      338.71,  raw= 339  [pixels]
CENTROID_Y:      287.59,  raw= 288  [pixels]
ROLL:            125.48 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -24.53
GRB_POS_XRT_Z:   85.84
IMAGE_URL:       sw00370791000msxps_rw.img
SUN_POSTN:       183.62d {+12h 14m 28s}   -1.57d {-01d 34' 00"}
SUN_DIST:        123.59 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.12d {+18h 52m 30s}  -24.33d {-24d 19' 45"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.78 [deg] galactic lon,lat of the burst
ECL_COORDS:       26.29,-53.22 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:05:36 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.3067d {+03h 05m 13.6s} (J2000),
                  46.3997d {+03h 05m 35.9s} (current),
                  45.8291d {+03h 03m 18.9s} (1950)
GRB_DEC:         -39.0062d {-39d 00' 22.3"} (J2000),
                 -38.9688d {-38d 58' 07.6"} (current),
                 -39.1994d {-39d 11' 57.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       104 [cnts]
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79036.76 SOD {21:57:16.76} UT,   88.3 [sec] since BAT Trigger Time
CENTROID_X:      338.71,  raw= 339  [pixels]
CENTROID_Y:      287.59,  raw= 288  [pixels]
ROLL:            125.48 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -24.53
GRB_POS_XRT_Z:   85.84
IMAGE_URL:       sw00370791000msxps_rw.img
SUN_POSTN:       183.62d {+12h 14m 28s}   -1.57d {-01d 34' 00"}
SUN_DIST:        123.59 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.13d {+18h 52m 30s}  -24.33d {-24d 19' 45"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.78 [deg] galactic lon,lat of the burst
ECL_COORDS:       26.29,-53.22 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:06:11 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.318d {+03h 05m 16s} (J2000),
                  46.411d {+03h 05m 39s} (current),
                  45.840d {+03h 03m 22s} (1950)
GRB_DEC:         -39.011d {-39d 00' 40"} (J2000),
                 -38.974d {-38d 58' 25"} (current),
                 -39.204d {-39d 12' 15"} (1950)
GRB_DATE:        15100 TJD;   269 DOY;   09/09/26
GRB_TIME:        78948.41 SOD {21:55:48.41} UT
TRIGGER_INDEX:   147
GRB_PHI:         144.29 [deg]
GRB_THETA:        40.07 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     14.69 [sigma]
IMAGE_SIGNIF:    6.74 [sigma]
LC_URL:          sw00370791000msb.lc
SUN_POSTN:       183.62d {+12h 14m 28s}   -1.57d {-01d 34' 00"}
SUN_DIST:        123.58 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.13d {+18h 52m 31s}  -24.33d {-24d 19' 42"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       26.29,-53.23 [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 = 19.29,15.78 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:06:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.337d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.014d {-39d 00' 49"} (J2000)
POINT_ROLL:      125.480d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79046.45 SOD {21:57:26.45} UT,   98.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.670
N_STARS:         18
X_OFFSET:        400 [pixels]
Y_OFFSET:        632 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1591 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0098.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 01"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.13d {+18h 52m 32s}  -24.33d {-24d 19' 40"}
MOON_DIST:        97.46 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:07:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.337d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.014d {-39d 00' 49"} (J2000)
POINT_ROLL:      125.480d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79046.45 SOD {21:57:26.45} UT,   98.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.670
N_STARS:         18
X_OFFSET:        400 [pixels]
Y_OFFSET:        632 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1591 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0098.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 01"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.14d {+18h 52m 33s}  -24.33d {-24d 19' 37"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:07:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.337d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.014d {-39d 00' 49"} (J2000)
ROLL:            125.480d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79046.45 SOD {21:57:26.45} UT,   98.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     275695051
X_OFFSET:        660 [pixels]
Y_OFFSET:        989 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       820
Y_GRB_POS:       1149
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0104.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 01"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.14d {+18h 52m 34s}  -24.33d {-24d 19' 36"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:07:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.337d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.014d {-39d 00' 49"} (J2000)
ROLL:            125.480d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79046.45 SOD {21:57:26.45} UT,   98.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     275695051
X_OFFSET:        660 [pixels]
Y_OFFSET:        989 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       820
Y_GRB_POS:       1149
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0104.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 02"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.14d {+18h 52m 34s}  -24.33d {-24d 19' 34"}
MOON_DIST:        97.45 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:06:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.337d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.014d {-39d 00' 49"} (J2000)
POINT_ROLL:      125.480d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79046.45 SOD {21:57:26.45} UT,   98.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.670
N_STARS:         18
X_OFFSET:        400 [pixels]
Y_OFFSET:        632 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1591 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0098.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 01"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.13d {+18h 52m 32s}  -24.33d {-24d 19' 40"}
MOON_DIST:        97.46 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:11:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.336d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 57"} (J2000)
POINT_ROLL:      125.484d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79258.44 SOD {22:00:58.44} UT,   310.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.456
N_STARS:         16
X_OFFSET:        340 [pixels]
Y_OFFSET:        669 [pixels]
X_MAX:           1299 [pixels]
Y_MAX:           1628 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00370791000msufc0310.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 06"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.18d {+18h 52m 44s}  -24.32d {-24d 19' 12"}
MOON_DIST:        97.43 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:11:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.336d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 57"} (J2000)
POINT_ROLL:      125.484d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79258.44 SOD {22:00:58.44} UT,   310.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.456
N_STARS:         16
X_OFFSET:        340 [pixels]
Y_OFFSET:        669 [pixels]
X_MAX:           1299 [pixels]
Y_MAX:           1628 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00370791000msufc0310.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 06"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.18d {+18h 52m 44s}  -24.32d {-24d 19' 12"}
MOON_DIST:        97.43 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:12:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.336d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 57"} (J2000)
POINT_ROLL:      125.484d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79258.44 SOD {22:00:58.44} UT,   310.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.456
N_STARS:         16
X_OFFSET:        340 [pixels]
Y_OFFSET:        669 [pixels]
X_MAX:           1299 [pixels]
Y_MAX:           1628 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00370791000msufc0310.fits
SUN_POSTN:       183.62d {+12h 14m 29s}   -1.57d {-01d 34' 06"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.19d {+18h 52m 45s}  -24.32d {-24d 19' 10"}
MOON_DIST:        97.43 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:13:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.336d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 57"} (J2000)
ROLL:            125.484d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79258.44 SOD {22:00:58.44} UT,   310.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     275695263
X_OFFSET:        660 [pixels]
Y_OFFSET:        989 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       820
Y_GRB_POS:       1149
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0316.fits
SUN_POSTN:       183.62d {+12h 14m 30s}   -1.57d {-01d 34' 07"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.19d {+18h 52m 46s}  -24.32d {-24d 19' 06"}
MOON_DIST:        97.43 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:13:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.336d {+03h 05m 21s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 57"} (J2000)
ROLL:            125.484d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79258.44 SOD {22:00:58.44} UT,   310.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     275695263
X_OFFSET:        660 [pixels]
Y_OFFSET:        989 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       820
Y_GRB_POS:       1149
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0316.fits
SUN_POSTN:       183.62d {+12h 14m 30s}   -1.57d {-01d 34' 07"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.19d {+18h 52m 47s}  -24.32d {-24d 19' 05"}
MOON_DIST:        97.42 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:13:50 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     370791,   Seg_Num: 0
GRB_RA:           46.3062d {+03h 05m 13.48s} (J2000),
                  46.3992d {+03h 05m 35.80s} (current),
                  45.8286d {+03h 03m 18.87s} (1950)
GRB_DEC:         -39.0053d {-39d 00' 19.0"} (J2000),
                 -38.9679d {-38d 58' 04.3"} (current),
                 -39.1985d {-39d 11' 54.4"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79363.00 SOD {22:02:43.00} UT,   414.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       183.62d {+12h 14m 30s}   -1.57d {-01d 34' 08"}
SUN_DIST:        123.59 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:      283.20d {+18h 52m 48s}  -24.32d {-24d 19' 02"}
MOON_DIST:        97.41 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.63,-59.78 [deg] galactic lon,lat of the burst
ECL_COORDS:       26.29,-53.22 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:18:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.335d {+03h 05m 20s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 58"} (J2000)
POINT_ROLL:      125.485d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79813.12 SOD {22:10:13.12} UT,   864.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.591
N_STARS:         55
X_OFFSET:        100 [pixels]
Y_OFFSET:        429 [pixels]
X_MAX:           1539 [pixels]
Y_MAX:           1868 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0864.fits
SUN_POSTN:       183.63d {+12h 14m 30s}   -1.57d {-01d 34' 13"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.24d {+18h 52m 58s}  -24.31d {-24d 18' 37"}
MOON_DIST:        97.40 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:19:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.335d {+03h 05m 20s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 58"} (J2000)
POINT_ROLL:      125.485d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79813.12 SOD {22:10:13.12} UT,   864.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.591
N_STARS:         55
X_OFFSET:        100 [pixels]
Y_OFFSET:        429 [pixels]
X_MAX:           1539 [pixels]
Y_MAX:           1868 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0864.fits
SUN_POSTN:       183.63d {+12h 14m 30s}   -1.57d {-01d 34' 13"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.25d {+18h 52m 59s}  -24.31d {-24d 18' 34"}
MOON_DIST:        97.40 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:18:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.335d {+03h 05m 20s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 58"} (J2000)
POINT_ROLL:      125.485d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79813.12 SOD {22:10:13.12} UT,   864.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.591
N_STARS:         55
X_OFFSET:        100 [pixels]
Y_OFFSET:        429 [pixels]
X_MAX:           1539 [pixels]
Y_MAX:           1868 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00370791000msufc0864.fits
SUN_POSTN:       183.63d {+12h 14m 30s}   -1.57d {-01d 34' 13"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.24d {+18h 52m 58s}  -24.31d {-24d 18' 37"}
MOON_DIST:        97.40 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 26 Sep 09 22:20:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.335d {+03h 05m 20s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 58"} (J2000)
ROLL:            125.485d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79813.12 SOD {22:10:13.12} UT,   864.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     275695818
X_OFFSET:        659 [pixels]
Y_OFFSET:        988 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       819
Y_GRB_POS:       1148
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0870.fits
SUN_POSTN:       183.63d {+12h 14m 31s}   -1.57d {-01d 34' 14"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.25d {+18h 53m 01s}  -24.31d {-24d 18' 30"}
MOON_DIST:        97.40 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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:     Sat 26 Sep 09 22:20:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     370791,   Seg_Num: 0
POINT_RA:         46.335d {+03h 05m 20s} (J2000)
POINT_DEC:       -39.016d {-39d 00' 58"} (J2000)
ROLL:            125.485d
IMG_START_DATE:  15100 TJD;   269 DOY;   09/09/26
IMG_START_TIME:  79813.12 SOD {22:10:13.12} UT,   864.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     275695818
X_OFFSET:        659 [pixels]
Y_OFFSET:        988 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       819
Y_GRB_POS:       1148
BINNING_INDEX:   1
IM_URL:          sw00370791000msuni0870.fits
SUN_POSTN:       183.63d {+12h 14m 31s}   -1.57d {-01d 34' 14"}
SUN_DIST:        123.57 [deg]   Sun_angle= 9.2 [hr] (West of Sun)
MOON_POSTN:      283.26d {+18h 53m 02s}  -24.31d {-24d 18' 28"}
MOON_DIST:        97.39 [deg]
MOON_ILLUM:      57 [%]
GAL_COORDS:      244.64,-59.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       26.31,-53.24 [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 #9935
D. Grupe (PSU), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), J. A. Kennea (PSU), P. T. O'Brien (U Leicester), P. Romano (INAF-IASFPA), M. Stamatikos (OSU/NASA/GSFC), M. A. Stark (PSU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 21:55:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090926B (trigger=370791). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 46.318, -39.011 which is
```
   RA(J2000)  = 03h 05m 16s
   Dec(J2000) = -39d 00' 40"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 20 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 21:57:16.8 UT, 88.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 46.30693, -39.00545 which is equivalent to:
```
   RA(J2000)  = 03h 05m 13.66s
   Dec(J2000) = -39d 00' 19.6"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.91e+20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 3.15e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 98 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 0.02.
Burst Advocate for this burst is D. Grupe (grupe 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.)
This circular is an official product of the Swift-XRT team.
GCN Circular #9939
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), D. Grupe (PSU), 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), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090926 (trigger #370791) (Grupe, et al., GCN Circ. 9935). The BAT ground-calculated position is RA, Dec = 46.310, -38.997 deg which is
```
    RA(J2000)  =  03h 05m 14.3s
    Dec(J2000) = -38d 59' 50.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%.
The mask-weighted light curve shows a sharp rise at T-20 sec, then a complex peak reaching a maximum at T-1 sec, followed by an approximately exponential decay. T90 (15-350 keV) is 109.7 +- 11.3 sec (estimated error including systematics).
The time-averaged spectrum from T-21.6 to T+133.2 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.52 +- 0.24, and Epeak of 78.3 +- 7.0 keV (chi squared 57.75 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 7.3 +- 0.2 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T-1.31 sec in the 15-150 keV band is 3.2 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.54 +- 0.00 (chi squared 125.34 for 57 d.o.f.). 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/370791/BA/
GCN Circular #9940
D. Grupe (PSU), P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
We have analysed the first two orbits of XRT data of GRB090926B (Grupe et al. GCN Circ. 9935). The data comprise 307 s in Windowed Timing (WT) mode and 1985 s in Photon Counting (PC) mode.
Using 1692 s of XRT Photon Counting mode data and 1 UVOT images, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 46.30840, -39.00600 which is equivalent to:
```
RA (J2000):  03 05 14.01
Dec (J2000): -39 00 21.5
```
with an uncertainty of 1.7" (radius, 90% confidence). This position is 32.7" from the BAT ground-calculated position given in Baumgartner et al (GCN circular 9939).
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, MNRAS, 397, 1177).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.84+/-0.07 with an absorption column of (1.70+/-0.22)e21 cm^-2 which is in excess of the Galactic value of 1.91 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum results is a slightly flatter X-ray spectrum with Gamma = 1.58+0.22-0.20. The absorption column density, however, is consistent with the WT result. Based on the excess absorption, according to Grupe et al. (2007, AJ, 133, 2216), the redshift of this burst is most likely less than 4.0.
The light curve can be modelled with a broken power-law decay with an index of alpha=2.00+/-0.05, followed by a break at T+712+190/-160 s to an alpha of 1.23 (-0.17, +0.07). If the afterglow continues to dacay with a slope of 1.23, the predicted count rate 24 hours after the trigger is 3.4e-3 counts s^-1 or 1.6e-13 ergs s^-1 cm^-2.
This circular is an official product of the Swift-XRT team.
GCN Circular #9941
D. Xu, D. Malesani (DARK/NBI), S. Barros (Queen Univ., Belfast), P. Jakobsson (Univ. Iceland), report on behalf of a larger collaboration.
We observed the field of GRB 090926B (Grupe et al., GCN 9935) with the NOT equipped with ALFOSC. Observations were carried out in the R and I bands, at high airmass (~2.5), starting on 2009 Sep 27.122 UT (4.99 hr after the GRB) and 27.146 UT (5.58 hr after the GRB), respectively.
No source is visible inside the enhanced X-ray error circle (Grupe et al., GCN 9940; http://www.swift.ac.uk/xrt_positions), down to a limiting magnitude R ~ 23 based on USNO-B1 stars in the field.
GCN Circular #9943
M. Morii (Tokyo Tech), M. Nakajima (Nihon U.), M. Matsuoka, K. Kawasaki, S. Ueno, H. Tomida, M. Suzuki, M. Ishikawa (JAXA), T. Mihara, M. Kohama, Y.E. Nakagawa, M. Sugizaki, T. Yamamoto (RIKEN), N. Kawai, K. Sugimori (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), H. Negoro, S. Miyoshi, H. Ozawa, R. Ishiwata, (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi (Kyoto U.) report on behalf of the MAXI team:
The Gas Slit Camera (GSC) of MAXI, the all-sky X-ray monitor on the ISS, detected a bright X-ray source at the position consistent with GRB 090926B (Grupe et al, GCN Circ. 9935) in the energy range of 2-30 keV. The nominal location of the source as measured by GSC is
(R.A., Dec.) = (46.3 deg, -39.1 deg) = (03:05:12, -39:06:00)(J2000)
with an estimated systematic uncertainty of about 1 degree.
The start time of the source detection (above 3 sigma level) was 21:55:31 UT on 26 September 2009, and seen until 21:55:55 UT. The start time was 17 sec earlier than the Swift-BAT trigger time, approximately consistent with the rise epoch (T-20) reported in the BAT refined analysis (Baumgartner et al., GCN Circ. 9939).
The X-ray flux at the peak was about 0.3 Crab (uncorrected). There are significant time structures within the transit light curve, which would be simply triangular for a steady source.
The all-sky image and the light curve is shown at the MAXI web site http://maxi.riken.jp/ at the "News" section.
MAXI is currently in the commissioning phase that runs for three months. The systematic uncertainty in localization will be significantly improved with the progress of the alignment calibration.
GCN Circular #9944
Daniele Malesani, Johan P. U. Fynbo (DARK/NBI) and V. D'Elia (ASDC and INAF/OAR) report on behalf of a larger collaboration:
We observed the field of GRB 090926B (Grupe et al., GCN 9935; Morii et al., GCN 9943) with the VLT UT1 equipped with FORS2. Seeing was 0.8-0.9". Preliminary inspection of the image reveals a faint, slightly extended source at a position consistent with the revised XRT error circle (Grupe et al., GCN 9940; http://www.swift.ac.uk/xrt_positions). Its coordinates are (0.5" error):
```
RA(J2000) = 03:05:13.94
Dec(J2000) = -39:00:22.2
```
and its magnitude (based on archival zeropoints) is R ~ 23 on 2009 Sep 27.246 UT (7.97 hr after the GRB). Inspection of the NOT images (Xu et al., GCN 9941) reveals a faint nebulosity, with a luminosity level consistent with the VLT measurement.
Presently, it is not clear whether this source is related to the GRB or not. It may be the host galaxy, or the blend of two faint, adjacent objects. Further observations are planned to evaluate its variability.
We gladly acknowledge excellent support from the ESO observing staff during a busy night, in particular Yuri Beletsky, and Stephane Brillant.
GCN Circular #9947
Johan P. U. Fynbo, Daniele Malesani (DARK/NBI), Pall Jakobsson (U. Iceland) and Valerio D'Elia (ASDC and INAF/OAR) report on behalf of a larger collaboration:
We observed the afterglow of GRB 090926B (Grupe et al, GCN 9935; Morii et al., GCN 9943). Using FORS2 on the Very Large Telescope, we have obtained 3*30 min spectra (300V grating) of the optical afterglow candidate (Malesani et al., GCN 9944). Observations commenced roughly 8 hours after the burst.
The combined spectrum shows an emission line, presumably corresponding to [O II] 3727 at z = 1.24. At his redshift we find several other absorption features, including Mg II, Fe II and Al III. Hence, we interpret the spectrum as a combination of the GRB afterglow and the host galaxy.
We acknowledge excellent support from the ESO observing staff, in particular Yuri Beletsky and Stephane Brillant.
GCN Circular #9949
S. R. Oates (MSSL-UCL) and D. Grupe (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090926B 98s after the BAT trigger (Grupe et al., GCN 9935). We do not detect any source at the position reported by VLT (Malesani et al., GCN 9944) and the enhanced Swift XRT position (Grupe et al. GCN 9940).
The 3-sigma upper limits for the finding charts (FC) and summed images are:
```
Filter   T_start   T_stop   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
white(FC)  98       248	     147       > 21.02
white      591      2053     303       > 21.21
v	   641      2103     175       > 19.19
b	   567      5976     226       > 20.32
u(FC)      310      560	     246       > 20.30
u	   715      5900     333       > 20.22
uvw1	   691      5695     333       > 20.25
uvm2	   5290     5490     197       > 19.77
uvw2	   616      1389     58        > 19.09
-------------------------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight of E_(B-V) = 0.02 mag. All photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9957
Michael S. Briggs (UA Huntsville), reports on behalf of the Fermi GBM Team:
"At 21:55:28.53 UT on 26 Sept 2009, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 090926B (trigger 275694930 / 090926.914), which also triggered the Swift BAT 19 seconds later (D. Grupe et al., GCN 9935). The GBM location is consistent with the Swift BAT location. The angle from the Fermi LAT boresight is approximately 100 degrees.
The GBM light curve shows multiple peaks with a duration (T90) of 81 +/- 13 s (10 to 1000 keV). The time-averaged spectrum from T0 to T0+48.6 s is best fit by cutoff power law with Epeak = 91 +/- 2 keV and index = -0.13 +/- 0.06. The fluence (10 to 1000 keV) in this time interval is (8.7 +/- 0.3)E-06 erg/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

GCN Circular #9996
J. Haislip, D. Reichart, K. Ivarsen, A. LaCluyze, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report:
Skynet observed the Swift/BAT localization of GRB 090926B (Grupe et al., GCN 9935) with four of the 16" PROMPT telescopes at CTIO beginning 2.7 hours after the trigger in UVRI.
We do not detect the afterglow (Grupe et al., GCN 9935; Malesani, Fynbo & D'Elia, GCN 9944). Stacking only images that increase the limiting magnitude yields:

mean                                                1-sig.  1-sig.
time                            3-sig.              sys.    stat.
since                           lim.    cal.        cal.    cal.
trig.  tel.      exp.     fil.  mag.    stars       unc.    unc.
(h)              (# x s)                            (mag)   (mag)

2.7    PROMPT-4  4 x 80   R     19.9    40 USNO B1  0.424   0.002
2.7    PROMPT-2  4 x 80   V     18.2    11 NOMAD    0.099   0.003
2.7    PROMPT-5  3 x 80   I     18.2    32 USNO B1  0.414   0.003

GCN Report 246.1
GCN_Report 246.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_246_1.pdf by D. Grupe at PSU titled: "Swift Observations of GRB 090926B"
1107.4844 from 26 Jul 11
Motoko Serino et al.: Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM
The monitor of all-sky X-ray image (MAXI) Gas Slit Camera (GSC) on the International Space Station (ISS) detected a gamma-ray burst (GRB) on 2009, September 26, GRB\,090926B. This GRB had extremely hard spectra in the X-ray energy range. Joint spectral fitting with the Gamma-ray Burst Monitor on the Fermi Gamma-ray Space Telescope shows that this burst has peculiarly narrow spectral energy distribution and is represented by Comptonized blackbody model. This spectrum can be interpreted as photospheric emission from the low baryon-load GRB fireball. Calculating the parameter of fireball, we found the size of the base of the flow $r_0 = (4.3 \pm 0.9) \times 10^{9} \, Y^{\prime \, -3/2}$ cm and Lorentz factor of the plasma $\Gamma = (110 \pm 10) \, Y^{\prime \, 1/4}$, where $Y^{\prime}$ is a ratio between the total fireball energy and the energy in the blackbody component of the gamma-ray emission. This $r_0$ is factor of a few larger, and the Lorentz factor of 110 is smaller by also factor of a few than other bursts that have blackbody components in the spectra.

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Jochen Greiner, last update: 26-Jul-2011 [Disclaimer]