Gamma-ray Burst 100727A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:42:34 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.166d {+10h 16m 40s} (J2000),
                 154.291d {+10h 17m 10s} (current),
                 153.573d {+10h 14m 17s} (1950)
GRB_DEC:         -21.364d {-21d 21' 51"} (J2000),
                 -21.417d {-21d 25' 02"} (current),
                 -21.114d {-21d 06' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5288 [cnts]    Image_Peak=218 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       33724 [cnts]
BKG_TIME:        20521.97 SOD {05:42:01.97} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15404 TJD;   208 DOY;   10/07/27
GRB_TIME:        20537.78 SOD {05:42:17.78} UT
GRB_PHI:         -122.96 [deg]
GRB_THETA:        12.43 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    8.09 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +0 -65  +0 
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 42"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.45d {+21h 13m 49s}  -12.85d {-12d 50' 47"}
MOON_DIST:       142.37 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.33, 28.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      164.82,-29.71 [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 = 99.96,-4.70 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:42:38 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     301902143
GRB_RA:          142.600d {+09h 30m 24s} (J2000),
                 142.729d {+09h 30m 55s} (current),
                 141.989d {+09h 27m 57s} (1950)
GRB_DEC:         -10.083d {-10d 04' 59"} (J2000),
                 -10.130d {-10d 07' 47"} (current),
                  -9.863d {-09d 51' 46"} (1950)
GRB_ERROR:       34.60 [deg radius, statistical plus systematic]
GRB_INTEN:       49 [cnts/sec]
DATA_SIGNIF:     4.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15404 TJD;   208 DOY;   10/07/27
GRB_TIME:        20542.00 SOD {05:42:22.00} UT
GRB_PHI:         339.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      2.04
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      51%  Solar Flare
2nd_MOST_LIKELY:  33%  GRB
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 42"}
SUN_DIST:         33.46 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      318.45d {+21h 13m 49s}  -12.85d {-12d 50' 46"}
MOON_DIST:       156.63 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      243.26, 28.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      148.52,-23.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 51.98,-20.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:43:50 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.1796d {+10h 16m 43.10s} (J2000),
                 154.3050d {+10h 17m 13.19s} (current),
                 153.5868d {+10h 14m 20.82s} (1950)
GRB_DEC:         -21.3911d {-21d 23' 27.9"} (J2000),
                 -21.4441d {-21d 26' 38.7"} (current),
                 -21.1411d {-21d 08' 28.0"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.29e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.81 [sigma]
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20594.42 SOD {05:43:14.42} UT,   56.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.22 261.64 243.33
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 41"}
SUN_DIST:         48.97 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.46d {+21h 13m 51s}  -12.84d {-12d 50' 33"}
MOON_DIST:       142.35 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.36, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      164.85,-29.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.78 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:44:00 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.1796d {+10h 16m 43.1s} (J2000),
                 154.3050d {+10h 17m 13.1s} (current),
                 153.5868d {+10h 14m 20.8s} (1950)
GRB_DEC:         -21.3911d {-21d 23' 27.9"} (J2000),
                 -21.4441d {-21d 26' 38.7"} (current),
                 -21.1411d {-21d 08' 28.0"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       61 [cnts]
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20594.42 SOD {05:43:14.42} UT,   56.6 [sec] since BAT Trigger Time
CENTROID_X:      332.74,  raw= 333  [pixels]
CENTROID_Y:      312.21,  raw= 312  [pixels]
ROLL:            324.31 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   33.51
GRB_POS_XRT_Z:   71.77
IMAGE_URL:       sw00430094000msxps_rw.img
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 41"}
SUN_DIST:         48.97 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.46d {+21h 13m 52s}  -12.84d {-12d 50' 31"}
MOON_DIST:       142.35 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.36, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      164.85,-29.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:44:08 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.1796d {+10h 16m 43.1s} (J2000),
                 154.3050d {+10h 17m 13.1s} (current),
                 153.5868d {+10h 14m 20.8s} (1950)
GRB_DEC:         -21.3911d {-21d 23' 27.9"} (J2000),
                 -21.4441d {-21d 26' 38.7"} (current),
                 -21.1411d {-21d 08' 28.0"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       61 [cnts]
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20594.42 SOD {05:43:14.42} UT,   56.6 [sec] since BAT Trigger Time
CENTROID_X:      332.74,  raw= 333  [pixels]
CENTROID_Y:      312.21,  raw= 312  [pixels]
ROLL:            324.31 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   33.51
GRB_POS_XRT_Z:   71.77
IMAGE_URL:       sw00430094000msxps_rw.img
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 41"}
SUN_DIST:         48.97 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.47d {+21h 13m 52s}  -12.84d {-12d 50' 29"}
MOON_DIST:       142.35 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.36, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      164.85,-29.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:46:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.166d {+10h 16m 40s} (J2000),
                 154.291d {+10h 17m 10s} (current),
                 153.573d {+10h 14m 17s} (1950)
GRB_DEC:         -21.364d {-21d 21' 51"} (J2000),
                 -21.417d {-21d 25' 02"} (current),
                 -21.114d {-21d 06' 51"} (1950)
GRB_DATE:        15404 TJD;   208 DOY;   10/07/27
GRB_TIME:        20537.78 SOD {05:42:17.78} UT
TRIGGER_INDEX:   137
GRB_PHI:         -122.96 [deg]
GRB_THETA:        12.43 [deg]
DELTA_TIME:      20.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    8.09 [sigma]
LC_URL:          sw00430094000msb.lc
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 40"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.48d {+21h 13m 55s}  -12.84d {-12d 50' 08"}
MOON_DIST:       142.39 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.33, 28.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      164.82,-29.71 [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 = 99.96,-4.70 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:46:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.174d {+10h 16m 42s} (J2000)
POINT_DEC:       -21.369d {-21d 22' 06"} (J2000)
POINT_ROLL:      324.305d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20603.27 SOD {05:43:23.27} UT,   65.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.921
N_STARS:         52
X_OFFSET:        528 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00430094000msufc0065.fits
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 40"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.49d {+21h 13m 57s}  -12.83d {-12d 50' 02"}
MOON_DIST:       142.39 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:46:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.174d {+10h 16m 42s} (J2000)
POINT_DEC:       -21.369d {-21d 22' 06"} (J2000)
POINT_ROLL:      324.305d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20603.27 SOD {05:43:23.27} UT,   65.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.921
N_STARS:         52
X_OFFSET:        528 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00430094000msufc0065.fits
SUN_POSTN:       126.43d {+08h 25m 44s}  +19.23d {+19d 13' 40"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.49d {+21h 13m 57s}  -12.83d {-12d 50' 02"}
MOON_DIST:       142.39 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:48:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.174d {+10h 16m 42s} (J2000)
POINT_DEC:       -21.369d {-21d 22' 06"} (J2000)
ROLL:            324.305d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20603.27 SOD {05:43:23.27} UT,   65.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     301902209
X_OFFSET:        649 [pixels]
Y_OFFSET:        871 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       809
Y_GRB_POS:       1031
BINNING_INDEX:   1
IM_URL:          sw00430094000msuni0072.fits
SUN_POSTN:       126.44d {+08h 25m 45s}  +19.23d {+19d 13' 39"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.50d {+21h 14m 00s}  -12.83d {-12d 49' 41"}
MOON_DIST:       142.40 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:48:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.174d {+10h 16m 42s} (J2000)
POINT_DEC:       -21.369d {-21d 22' 06"} (J2000)
ROLL:            324.305d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20603.27 SOD {05:43:23.27} UT,   65.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     301902209
X_OFFSET:        649 [pixels]
Y_OFFSET:        871 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       809
Y_GRB_POS:       1031
BINNING_INDEX:   1
IM_URL:          sw00430094000msuni0072.fits
SUN_POSTN:       126.44d {+08h 25m 45s}  +19.23d {+19d 13' 39"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.50d {+21h 14m 01s}  -12.83d {-12d 49' 38"}
MOON_DIST:       142.40 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [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:     Tue 27 Jul 10 05:54:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.178d {+10h 16m 43s} (J2000)
POINT_DEC:       -21.371d {-21d 22' 14"} (J2000)
POINT_ROLL:      324.306d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20815.46 SOD {05:46:55.46} UT,   277.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.207
N_STARS:         31
X_OFFSET:        329 [pixels]
Y_OFFSET:        551 [pixels]
X_MAX:           1288 [pixels]
Y_MAX:           1510 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00430094000msufc0277.fits
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 35"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.55d {+21h 14m 11s}  -12.81d {-12d 48' 36"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:54:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.178d {+10h 16m 43s} (J2000)
POINT_DEC:       -21.371d {-21d 22' 14"} (J2000)
POINT_ROLL:      324.306d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20815.46 SOD {05:46:55.46} UT,   277.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.207
N_STARS:         31
X_OFFSET:        329 [pixels]
Y_OFFSET:        551 [pixels]
X_MAX:           1288 [pixels]
Y_MAX:           1510 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00430094000msufc0277.fits
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 35"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.55d {+21h 14m 11s}  -12.81d {-12d 48' 36"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:54:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.178d {+10h 16m 43s} (J2000)
POINT_DEC:       -21.371d {-21d 22' 14"} (J2000)
POINT_ROLL:      324.306d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20815.46 SOD {05:46:55.46} UT,   277.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.207
N_STARS:         31
X_OFFSET:        329 [pixels]
Y_OFFSET:        551 [pixels]
X_MAX:           1288 [pixels]
Y_MAX:           1510 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00430094000msufc0277.fits
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 35"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.55d {+21h 14m 12s}  -12.81d {-12d 48' 33"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Jul 10 05:55:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.178d {+10h 16m 43s} (J2000)
POINT_DEC:       -21.371d {-21d 22' 14"} (J2000)
ROLL:            324.306d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20815.46 SOD {05:46:55.46} UT,   277.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     301902421
X_OFFSET:        649 [pixels]
Y_OFFSET:        871 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       809
Y_GRB_POS:       1031
BINNING_INDEX:   1
IM_URL:          sw00430094000msuni0284.fits
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 35"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.56d {+21h 14m 14s}  -12.81d {-12d 48' 21"}
MOON_DIST:       142.44 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [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 Circular #10998
D. C. Morris (GWU/GSFC), M. M. Chester (PSU), J. M. Gelbord (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (INAF-IASFPA), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 05:42:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100727A (trigger=430094). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 154.166, -21.364 which is
```
   RA(J2000) = 10h 16m 40s
   Dec(J2000) = -21d 21' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 50 sec, with possible additional activity around T+175. The peak count rate was ~3300 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 05:43:14.4 UT, 56.6 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 154.17823, -21.39002 which is equivalent to:
```
   RA(J2000)  = 10h 16m 42.78s
   Dec(J2000) = -21d 23' 24.1"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 100 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 5.09e+20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 1.29e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 65 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. Data from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is D. C. Morris (david.c.morris AT 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:     Tue 27 Jul 10 05:56:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     430094,   Seg_Num: 0
POINT_RA:        154.178d {+10h 16m 43s} (J2000)
POINT_DEC:       -21.371d {-21d 22' 14"} (J2000)
ROLL:            324.306d
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20815.46 SOD {05:46:55.46} UT,   277.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     301902421
X_OFFSET:        649 [pixels]
Y_OFFSET:        871 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       809
Y_GRB_POS:       1031
BINNING_INDEX:   1
IM_URL:          sw00430094000msuni0284.fits
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 34"}
SUN_DIST:         48.94 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.56d {+21h 14m 15s}  -12.81d {-12d 48' 18"}
MOON_DIST:       142.44 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.34, 28.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      164.83,-29.71 [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:     Tue 27 Jul 10 05:56:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     430094,   Seg_Num: 0
GRB_RA:          154.1773d {+10h 16m 42.55s} (J2000),
                 154.3027d {+10h 17m 12.64s} (current),
                 153.5845d {+10h 14m 20.27s} (1950)
GRB_DEC:         -21.3902d {-21d 23' 24.7"} (J2000),
                 -21.4432d {-21d 26' 35.4"} (current),
                 -21.1402d {-21d 08' 24.8"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15404 TJD;   208 DOY;   10/07/27
IMG_START_TIME:  20678.00 SOD {05:44:38.00} UT,   140.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       126.44d {+08h 25m 46s}  +19.23d {+19d 13' 34"}
SUN_DIST:         48.96 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      318.56d {+21h 14m 15s}  -12.80d {-12d 48' 15"}
MOON_DIST:       142.43 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      261.36, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      164.84,-29.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #10999
S. Kobara, K. Omori, T. Sumi, D. Suzuki, H.Naito and T. Sako (STE Lab. , Nagoya Univ.) on behalf of the MOA Collaboration report :
We searched for an optical afterglow of GRB100727A (GCN 10998, D. C. Morris et al.) starting from 07:12:3 UT on 2010 July 27 ( 90 minutes after the burst) with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand. In a single image of a 300 sec exposure with a wideband Red filter (center wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object within the error circle of the Swift XRT source position (GCN 10998, D. C. Morris et al. ). A 3 sigma upper limit is set in the I magnitude at 21.6 mag.
This photometry was done by using the DoPhot and calibrated against the USNO-B1.0 catalog stars, and not corrected for the Galactic extinction.
GCN Circular #11000
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 4198 s of XRT Photon Counting mode data and 8 UVOT images for GRB 100727A, 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 = 154.17739, -21.39042 which is equivalent to:
```
RA (J2000): 10h 16m 42.57s
Dec (J2000): -21d 23' 25.5"
```
with an uncertainty of 1.6 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, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11001
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. C. Morris (GWU/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+617 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100727A (trigger #430094) (Morris, et al., GCN Circ. 10998). The BAT ground-calculated position is RA, Dec = 154.187, -21.417 deg which is
```
    RA(J2000)  =  10h 16m 44.8s
    Dec(J2000) = -21d 25' 02.7"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The burst began with weak precursor activity starting at T-80 sec and peaking at T-40 sec. The main pulse, a mostly featureless FRED profile, began at T-2 sec and continued to approximately T+50 sec. T90 (15-350 keV) is 84 +- 14 sec (estimated error including systematics).
The time-averaged spectrum from T-82.0 to T+29.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.13. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+1.33 sec in the 15-150 keV band is 1.2 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/430094/BA/
GCN Circular #11002
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 05:42:22.00 UT on 27 July 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100727A (trigger 301902143 / 100727238), which was also detected by the SWIFT-BAT (Morris et al. 2010, GCN 10998) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 95.1 degrees.
The GBM light curve consists of single peak with a duration (T90) of about 24 +/- 3 s (50-300 keV). The time-averaged spectrum from T0-6.144 s to T0+12.288 s is best fit by a simple power law function with index -1.71 +/- 0.04 (Castor C-STAT 785 for 473 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (2.03 +/- 0.14)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0-4.096 s in the 8-1000 keV band is 1.6 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11003
B. Sbarufatti (INAF OAB/IASF PA), V. Mangano (INAF/IASF PA) and D. C. Morris (GWU/GSFC) report on behalf of the Swift-XRT team:
We have analysed 9.8 ks of XRT data for GRB 100727A (Morris et al. GCN Circ. 10998), from 48 s to 39.8 ks after the BAT trigger. The data comprise 185 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 11000). The light curve can be modeled with a doubly broken power-law decay. The initial decay index is alpha=2.6 (+/-0.1). A bright flare starts at T+190 s and peaks at T+247 s. The light curve breaks at T+450 s entering a plateau phase with alpha=0.0 (+0.06 -0.08). The second break is observed at T+6.5 ks, followed by a decay index alpha=0.64 (+0.12-0.09)
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.8 (+/-0.14). The best-fitting absorption column is 4.2 (+/-0.3) x 10^21 cm^-2, in excess of the Galactic value of 5.1 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.6 (+/-0.2) and a best-fitting absorption column of 3.1 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 9.7 x 10^-11 (2.3 x 10^-10) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 0.64, the count rate at T+24 hours will be 2.8 x 10^-2 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.7 x 10-12 (6.4 x 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/00430094.
This circular is an official product of the Swift-XRT team.
GCN Circular #11019
S. T. Holland (CRESST/GSFC/USRA) and D. C. Morris (GWU/GSFC) report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 100727A starting 47 s after the BAT trigger (Morris, et al., 2010, GCN Circ. 10998). Settled observations started at 65 s. We do not find any new source, relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT afterglow (Osborne, et al. 2010, GCN Circ. 11000). Preliminary 3-sigma upper limits for detecting a source in the finding charts, and in the co-added images, using a 2.5 arcsecond radius circular aperture, are
```
Filter      T_start    T_stop    Exp(s)      Mag
------------------------------------------------
white (fc)       65       215       147    >20.8
                856      1006       147    >21.2
    u (fc)      278       527       246    >20.5
    v           609    18,409      1414    >20.9
    b           533    24,918      1215    >21.7
    u           278    24,189      2335    >21.7
 uvw1           658    29,885      2289    >21.9
 uvm2           633    28,542      2390    >21.8
 uvw2           584    17,496      1415    >21.8
white            65      7075       805    >22.1
------------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.05 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).

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Jochen Greiner, last update: 27-Jul-2010 [Disclaimer]