Gamma-ray Burst 071031

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:07:30 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.458d {+00h 25m 50s} (J2000),
                   6.551d {+00h 26m 12s} (current),
                   5.866d {+00h 23m 28s} (1950)
GRB_DEC:         -58.045d {-58d 02' 42"} (J2000),
                 -58.002d {-58d 00' 07"} (current),
                 -58.322d {-58d 19' 19"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       17564 [cnts]    Image_Peak=455 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   291     E_range: 15-50 keV
BKG_INTEN:       156550 [cnts]
BKG_TIME:        3941.67 SOD {01:05:41.67} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14404 TJD;   304 DOY;   07/10/31
GRB_TIME:        3996.96 SOD {01:06:36.96} UT
GRB_PHI:         -139.77 [deg]
GRB_THETA:        27.72 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.71 [sigma]
IMAGE_SIGNIF:    9.48 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +1  +0  +0  +0 +24  +1 
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 24"}
SUN_DIST:        104.40 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.85d {+07h 03m 24s}  +26.68d {+26d 40' 56"}
MOON_DIST:       117.21 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.46,-58.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.72,-53.33 [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 = 278.33,2.09 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:08:54 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.4061d {+00h 25m 37.4s} (J2000),
                   6.4986d {+00h 25m 59.6s} (current),
                   5.8134d {+00h 23m 15.2s} (1950)
GRB_DEC:         -58.0585d {-58d 03' 30.6"} (J2000),
                 -58.0152d {-58d 00' 54.6"} (current),
                 -58.3353d {-58d 20' 07.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       176 [cnts]
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4099.76 SOD {01:08:19.76} UT,   102.8 [sec] since BAT Trigger Time
CENTROID_X:      242.05,  raw= 242  [pixels]
CENTROID_Y:      267.11,  raw= 267  [pixels]
ROLL:            208.43 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -72.79
GRB_POS_XRT_Z:   -142.01
IMAGE_URL:       sw00295670000msxps_rw.img
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 25"}
SUN_DIST:        104.37 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.86d {+07h 03m 27s}  +26.68d {+26d 40' 48"}
MOON_DIST:       117.25 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.51,-58.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.67,-53.33 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:09:03 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.4061d {+00h 25m 37.4s} (J2000),
                   6.4986d {+00h 25m 59.6s} (current),
                   5.8134d {+00h 23m 15.2s} (1950)
GRB_DEC:         -58.0585d {-58d 03' 30.6"} (J2000),
                 -58.0152d {-58d 00' 54.6"} (current),
                 -58.3353d {-58d 20' 07.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       176 [cnts]
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4099.76 SOD {01:08:19.76} UT,   102.8 [sec] since BAT Trigger Time
CENTROID_X:      242.05,  raw= 242  [pixels]
CENTROID_Y:      267.11,  raw= 267  [pixels]
ROLL:            208.43 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -72.79
GRB_POS_XRT_Z:   -142.01
IMAGE_URL:       sw00295670000msxps_rw.img
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 26"}
SUN_DIST:        104.37 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.87d {+07h 03m 28s}  +26.68d {+26d 40' 47"}
MOON_DIST:       117.25 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.51,-58.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.67,-53.33 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:08:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.4061d {+00h 25m 37.4s} (J2000),
                   6.4986d {+00h 25m 59.6s} (current),
                   5.8134d {+00h 23m 15.2s} (1950)
GRB_DEC:         -58.0585d {-58d 03' 30.6"} (J2000),
                 -58.0152d {-58d 00' 54.6"} (current),
                 -58.3353d {-58d 20' 07.1"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.22e-09 [erg/cm2/sec]
GRB_SIGNIF:      13.26 [sigma]
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4099.76 SOD {01:08:19.76} UT,   102.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.27 261.29 243.53
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 25"}
SUN_DIST:        104.37 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.86d {+07h 03m 27s}  +26.68d {+26d 40' 48"}
MOON_DIST:       117.25 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.51,-58.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.67,-53.33 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:10:12 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.458d {+00h 25m 50s} (J2000),
                   6.551d {+00h 26m 12s} (current),
                   5.866d {+00h 23m 28s} (1950)
GRB_DEC:         -58.045d {-58d 02' 42"} (J2000),
                 -58.002d {-58d 00' 07"} (current),
                 -58.322d {-58d 19' 19"} (1950)
GRB_DATE:        14404 TJD;   304 DOY;   07/10/31
GRB_TIME:        3996.96 SOD {01:06:36.96} UT
TRIGGER_INDEX:   291
GRB_PHI:         -139.77 [deg]
GRB_THETA:        27.72 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.71 [sigma]
IMAGE_SIGNIF:    9.48 [sigma]
LC_URL:          sw00295670000msb.lc
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 26"}
SUN_DIST:        104.40 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.88d {+07h 03m 31s}  +26.68d {+26d 40' 40"}
MOON_DIST:       117.23 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.46,-58.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.72,-53.33 [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 = 278.33,2.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:10:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.475d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.034d {-58d 02' 01"} (J2000)
POINT_ROLL:      208.432d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4109.60 SOD {01:08:29.60} UT,   112.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.140
N_STARS:         41
X_OFFSET:        584 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0112.fits
SUN_POSTN:       214.88d {+14h 19m 31s}  -13.92d {-13d 55' 27"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.88d {+07h 03m 32s}  +26.68d {+26d 40' 37"}
MOON_DIST:       117.22 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:11:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.475d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.034d {-58d 02' 01"} (J2000)
POINT_ROLL:      208.432d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4109.60 SOD {01:08:29.60} UT,   112.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.140
N_STARS:         41
X_OFFSET:        584 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0112.fits
SUN_POSTN:       214.88d {+14h 19m 32s}  -13.92d {-13d 55' 27"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.89d {+07h 03m 33s}  +26.68d {+26d 40' 35"}
MOON_DIST:       117.22 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:13:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     9085451,   Seg_Num: 6
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            0.000d
IMG_START_DATE:  22969 TJD;   8869 DOY;   07/135229501/145291480
IMG_START_TIME:  84693.14 SOD {23:31:33.14} UT,   80696.2 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     212797433
X_OFFSET:        1534 [pixels]
Y_OFFSET:        55 [pixels]
WIDTH:           1856 [pixels]
HEIGHT:          1527 [pixels]
X_GRB_POS:       191
Y_GRB_POS:       1414
BINNING_INDEX:   12
IM_URL:          sw00295670000msuni740096696.fits
SUN_POSTN:       214.88d {+14h 19m 32s}  -13.93d {-13d 55' 29"}
SUN_DIST:        143.21 [deg]   Sun_angle= -9.7 [hr] (East of Sun)
MOON_POSTN:      105.91d {+07h 03m 39s}  +26.67d {+26d 40' 21"}
MOON_DIST:       103.75 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:13:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     9085451,   Seg_Num: 6
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            0.000d
IMG_START_DATE:  22969 TJD;   8869 DOY;   07/135229501/145291480
IMG_START_TIME:  84693.14 SOD {23:31:33.14} UT,   80696.2 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     212797433
X_OFFSET:        1534 [pixels]
Y_OFFSET:        55 [pixels]
WIDTH:           1856 [pixels]
HEIGHT:          1527 [pixels]
X_GRB_POS:       191
Y_GRB_POS:       1414
BINNING_INDEX:   12
IM_URL:          sw00295670000msuni740096696.fits
SUN_POSTN:       214.88d {+14h 19m 32s}  -13.93d {-13d 55' 30"}
SUN_DIST:        143.21 [deg]   Sun_angle= -9.7 [hr] (East of Sun)
MOON_POSTN:      105.92d {+07h 03m 41s}  +26.67d {+26d 40' 19"}
MOON_DIST:       103.75 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:18:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 53"} (J2000)
POINT_ROLL:      208.433d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4215.65 SOD {01:10:15.65} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.027
N_STARS:         28
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0218.fits
SUN_POSTN:       214.89d {+14h 19m 33s}  -13.93d {-13d 55' 33"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.97d {+07h 03m 53s}  +26.66d {+26d 39' 52"}
MOON_DIST:       117.25 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:19:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 53"} (J2000)
ROLL:            208.433d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4215.65 SOD {01:10:15.65} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215485817
X_OFFSET:        1119 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1279
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0218.fits
SUN_POSTN:       214.89d {+14h 19m 33s}  -13.93d {-13d 55' 34"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.98d {+07h 03m 55s}  +26.66d {+26d 39' 48"}
MOON_DIST:       117.26 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:23:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
POINT_ROLL:      208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4862.07 SOD {01:21:02.07} UT,   865.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.169
N_STARS:         26
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0865.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 38"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.02d {+07h 04m 06s}  +26.66d {+26d 39' 24"}
MOON_DIST:       117.28 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:24:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
ROLL:            208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4862.07 SOD {01:21:02.07} UT,   865.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     215486464
X_OFFSET:        1118 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0865.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 38"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.03d {+07h 04m 08s}  +26.66d {+26d 39' 19"}
MOON_DIST:       117.28 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:25:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
ROLL:            208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4862.07 SOD {01:21:02.07} UT,   865.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     215486464
X_OFFSET:        1118 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0865.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 39"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.04d {+07h 04m 09s}  +26.65d {+26d 39' 16"}
MOON_DIST:       117.28 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:28:13 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
POINT_ROLL:      208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4967.92 SOD {01:22:47.92} UT,   971.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.675
N_STARS:         29
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00295670000msufc0970.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 41"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.07d {+07h 04m 17s}  +26.65d {+26d 38' 58"}
MOON_DIST:       117.29 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:28:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
POINT_ROLL:      208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4967.92 SOD {01:22:47.92} UT,   971.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.675
N_STARS:         29
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00295670000msufc0970.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 42"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.08d {+07h 04m 18s}  +26.65d {+26d 38' 55"}
MOON_DIST:       117.30 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:29:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
ROLL:            208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4967.92 SOD {01:22:47.92} UT,   971.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215486570
X_OFFSET:        1118 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0970.fits
SUN_POSTN:       214.89d {+14h 19m 34s}  -13.93d {-13d 55' 42"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.08d {+07h 04m 20s}  +26.65d {+26d 38' 52"}
MOON_DIST:       117.30 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [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:     Wed 31 Oct 07 01:29:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
ROLL:            208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4967.92 SOD {01:22:47.92} UT,   971.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215486570
X_OFFSET:        1118 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0970.fits
SUN_POSTN:       214.89d {+14h 19m 35s}  -13.93d {-13d 55' 42"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.09d {+07h 04m 21s}  +26.65d {+26d 38' 50"}
MOON_DIST:       117.30 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:31:56 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.4053d {+00h 25m 37.27s} (J2000),
                   6.4978d {+00h 25m 59.46s} (current),
                   5.8126d {+00h 23m 15.01s} (1950)
GRB_DEC:         -58.0594d {-58d 03' 33.8"} (J2000),
                 -58.0161d {-58d 00' 57.9"} (current),
                 -58.3362d {-58d 20' 10.4"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         19.79 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4111.89 SOD {01:08:31.89} UT,   114.9 [sec] since BAT Trigger Time
SUN_POSTN:       214.90d {+14h 19m 35s}  -13.93d {-13d 55' 44"}
SUN_DIST:        104.36 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.11d {+07h 04m 27s}  +26.64d {+26d 38' 37"}
MOON_DIST:       117.35 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.51,-58.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      331.67,-53.33 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:35:03 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     295670,   Seg_Num: 0
GRB_RA:            6.4046d {+00h 25m 37.1s} (J2000),
                   6.4971d {+00h 25m 59.2s} (current),
                   5.8119d {+00h 23m 14.8s} (1950)
GRB_DEC:         -58.0585d {-58d 03' 30.6"} (J2000),
                 -58.0152d {-58d 00' 54.6"} (current),
                 -58.3353d {-58d 20' 07.1"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4755.00 SOD {01:19:15.00} UT,   758.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       214.90d {+14h 19m 35s}  -13.93d {-13d 55' 47"}
SUN_DIST:        104.36 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.14d {+07h 04m 35s}  +26.64d {+26d 38' 19"}
MOON_DIST:       117.36 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.51,-58.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      331.67,-53.33 [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.php for details.

GCN Circular #7020
M. C. Stroh (PSU), C. Gronwall (PSU), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), C. Pagani (PSU), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 01:06:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071031 (trigger=295670). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 6.458, -58.045 which is
```
   RA(J2000) = 00h 25m 50s
   Dec(J2000) = -58d 02' 42"
```
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 30 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 01:08:19 UT, 103 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source located at RA, Dec 6.4061, -58.0585 which is
```
   RA(J2000)  =  00h 25m 37.4s
   Dec(J2000) = -58d 03' 30.6"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 110 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 5.2e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 112 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
   RA(J2000) =	00:25:37.27 =	6.4053
   DEC(J2000) = -58:03:34.2 = -58.0595
```
with a 1-sigma error radius of about 0.5 arc sec. This position is 3.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.8 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:18:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 53"} (J2000)
POINT_ROLL:      208.433d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4215.65 SOD {01:10:15.65} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.027
N_STARS:         28
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0218.fits
SUN_POSTN:       214.89d {+14h 19m 33s}  -13.93d {-13d 55' 33"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.97d {+07h 03m 52s}  +26.67d {+26d 39' 54"}
MOON_DIST:       117.25 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:23:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 52"} (J2000)
POINT_ROLL:      208.434d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4862.07 SOD {01:21:02.07} UT,   865.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.169
N_STARS:         26
X_OFFSET:        799 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1758 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00295670000msufc0865.fits
SUN_POSTN:       214.89d {+14h 19m 33s}  -13.93d {-13d 55' 37"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      106.02d {+07h 04m 04s}  +26.66d {+26d 39' 26"}
MOON_DIST:       117.27 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 31 Oct 07 01:19:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     295670,   Seg_Num: 0
POINT_RA:          6.474d {+00h 25m 54s} (J2000)
POINT_DEC:       -58.032d {-58d 01' 53"} (J2000)
ROLL:            208.433d
IMG_START_DATE:  14404 TJD;   304 DOY;   07/10/31
IMG_START_TIME:  4215.65 SOD {01:10:15.65} UT,   218.7 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215485817
X_OFFSET:        1119 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1279
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00295670000msuni0218.fits
SUN_POSTN:       214.89d {+14h 19m 33s}  -13.93d {-13d 55' 34"}
SUN_DIST:        104.41 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      105.98d {+07h 03m 56s}  +26.66d {+26d 39' 46"}
MOON_DIST:       117.26 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      309.45,-58.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      331.75,-53.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #7021
T. Kruehler, J. Greiner, P. Afonso, A. Kuepcue-Yoldas, A. Yoldas, G. Szokoly (all MPE Garching) report for the GROND team:
We started observing GRB 071031 (trigger 295670) simultaneously in grizJHK with GROND, mounted at the 2.2m MPI/ESO telescope at La Silla (Chile), about 60 sec after the alert. A bright object (r~15) is seen in all filters, including the g-band, implying a redshift smaller than 3.5.
The coordinates are
```
RA (2000.0) = 00h 25m 37.2s
Decl (2000.0) = -58d 03' 30" 
```
located within the XRT error circle, and consistent with the UVOT position.
GCN Circular #7022
J. Haislip, K. Ivarsen, D. Reichart, M. Nysewander, A. LaCluyze, J. A. Crain, A. Foster, M. Schubel, J. Styblova, T. Brennan, and A. Trotter report:
Skynet observed the localization of GRB 071031 (Stroh et al., GCN 7020) with three of the 16" PROMPT telescopes at CTIO beginning 78 seconds after the burst (24 seconds after notification) in UBVR.
We detect the afterglow (Stroh et al., GCN 7020). At 8.2 minutes after the burst, we measure R ~ 18.2 mag calibrated to four USNO B1.0 stars.
GCN Circular #7023
C. Ledoux (ESO), P. Jakobsson (Univ. Herfordshire), A.O. Jaunsen (Univ. Oslo), C.C. Thoene, P.M. Vreeswijk, D. Malesani, J.P.U. Fynbo, J. Hjorth (DARK), report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 071031 (Stroh et al., GCN 7020; Kruehler et al., GCN 7021; Haislip et al., GCN 7022) with the ESO VLT. Observations were triggered automatically in rapid response mode starting on 2007 Oct 31 at 01:16 UT (9.3 min after the trigger). We secured high- and low-resolution spectroscopy with UVES and FORS2, respectively.
From the detection of a DLA and several metallic lines, including fine-structure transitions, we determine the redshift to be z=2.692, consistently in the UVES and FORS2 spectra. Further analysis is ongoing.
We acknowledge excellent support from the observing staff at Paranal, in particular Stan Stefl and Rachel Gilmour.
GCN Circular #7024
B. E. Cobb (Yale), part of the larger SMARTS consortium, reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 071030 (GCN 7020, Stroh et al.), with a mid-exposure time of 2007-10-31 01:46 UT, which is ~40 minutes post-burst. Several dithered images were obtained in each filter, with total summed exposure times of 180s in each of BRIYJK and 120s in each of H and V.
The GRB afterglow (GCN 7020, Stroh et al. & GCN 7021, Kruehler et al.) is detected at I=17.4+/-0.1 (Photometry is calibrated against USNO-B1.0 stars). Additional imaging at 1.5 hours post-burst indicates an approximate decay rate of alpha~-0.6 (where afterglow flux is proportional to t^alpha).
GCN Circular #7025
L.A. Antonelli, S. Covino, P. D'Avanzo, D. Fugazza, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. Dalessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V. Testa, S.D. Vergani, F. Vitali report on behalf of the REM team:
The robotic 60-cm REM telescope located at La Silla (Chile) observed the field of the GRB 071031 (Stroh et al., GCN 7020). Observations was performed automatically in the both optical (R, I) and NIR (Z, J, H, K) filters under poor seeing condition starting at 01:08:19 UT (about 46 sec after the alert and 102 sec after the burst ) .
A preliminary analysis of the first set of R-band and H-band exposures does not reveal the optical afterglow candidate reported by Stroh et al., (GCN 7020), Kruehler et al. (GCN 7021) and Haislip et al. (GCN. 7022). We derive the following upper limits of R > 16.4 (calibrated against USNO B1catalog) and H > 13.8 (calibrated against the 2MASS catalog).
Futher analysis are in progress.
GCN Circular #7027
M. C. Stroh, A. Falcone and J. L. Racusin (PSU) report on behalf of the Swift-XRT Team:
We have analysed the first 4 orbits of Swift-XRT data obtained for GRB 071031 (Stroh et al. GCN Circ. 7020), totaling 658 s of Windowed Timing (WT) data and 7.8ks of Photon Counting (PC) data.
Using 246 s of overlapping XRT Photon Counting mode and UVOT V-band data, 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 = 6.40565, -58.05926 which is equivalent to:
```
RA (J2000): 00 25 37.36
Dec (J2000): -58 03 33.3
```
with an uncertainty of 2.0 arcsec (radius, 90% confidence). This is 2.9 and 1.1 arcsec from the previous XRT and UVOT positions respectively (Stroh et al., GCN Circ 7020).
The light curve begins with a count rate ~150 cts/s and it is dominated by flaring. Two of the flares reach ~200 cts/s while in WT mode. By T+10 ks, the flux decreased down to a count rate ~0.01 cts/s. Due to the amount of flaring in this X-ray light curve, we are unable to determine the slope of the underlying power laws and thus are presently unable to predict the count rate at T+24 hours.
The WT data (109-750 seconds) can be modeled as an absorbed power-law, with photon index of 1.89 +/- 0.02 and a total absorbing column of NH = (7.0 +/- 0.4)e20 cm^-2 which is greater than the Galactic value of 1.22e20 cm^-2. The 0.3-10 keV absorbed (unabsorbed) flux during this time is 1.2e-9 (1.4e-9) erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #7028
A. A. Breeveld (MSSL/UCL) and M. Stroh (PSU) report on behalf of the=20 Swift-UVOT team:
The Swift/UVOT observed the burst GRB 071031 (Stroh et al. GCN Circ.=20 7020) starting with the finding chart exposure in white, 114 seconds=20 after the BAT trigger. The afterglow is detected at the UVOT position=20 given in Stroh et al. (GCN Circ. 7020) in white, v and b until at least=20 7000s after the trigger. It is barely detected in u and not at all in=20 the UV filters; this is consistent with the redshift of z=3D2.692 found b= y=20 Ledoux et al. (GCN Circ. 7023). The brightness apparently increases for=20 the first few hundred seconds and then fades with an estimated temporal=20 slope in the v filter of alpha =3D 0.56.
The initial UVOT magnitudes and upper limits from single exposures or=20 co-added exposures are as follows: Filter Tstart(s) Tstop(s) Exp(s) Mag
```
white   114        213       99.8    19.88 =B1 0.14
          715       724       9.8     19.3  =B1 0.3
         867        966       99.8    19.41 =B1 0.1
        6778       6977      199.8    20.67 =B1 0.18
v       220        619      399.8    19.08 =B1 0.15
         973       1219      246.2    18.5 =B1 0.13
       11517      11816      299.8    19.93 =B1 0.32
b       700        709        9.8    >18.77 (3 sigma UL)
        6573       6772       199.8   20.25 =B1 0.23
u       675        847        38.9   19.38 =B1 0.38
        4933       6567       393.3   >20.82 (3 sigma UL)
uvw1   651       16990      1317.7   >21.41 (3 sigma UL)
uvm2   626       12782      1089.4   >21.23 (3 sigma UL)
uvw2   730       11206      1118.4   >21.46 (3 sigma UL)
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} =3D 0.012 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7029
M. Stamatikos (GSFC/ORAU), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-119 to T+297 sec from recent telemetry downlinks, we report further analysis of BAT GRB 071031 (trigger #295670) (Stroh, et al., GCN Circ. 7020). The BAT ground-calculated position is RA, Dec = 6.399, -58.048 deg, which is
```
   RA(J2000)  =  00h 25m 35.8s 
   Dec(J2000) = -58d 2' 51" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.
The mask-weighted light curve shows multiple peaks. The first starts at ~T-10 sec, peaks at ~T+5 sec, and is essentially back to baseline by ~T+40 sec. The next largest peak starts at ~T+100 sec, peaks at ~T+105 sec, and returns to baseline by ~T+180 sec. T90 (15-350 keV) is 180 +- 10 sec (estimated error including systematics).
The time-averaged spectrum from T-4.5 to T+192.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.42 +- 0.29. The fluence in the 15-150 keV band is 9.0 +- 1.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.92 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
We note that the fluence ratio in a simple power-law fit between the 25-50 keV band and the 50-100 keV band is 1.34. This fluence ratio is larger than 1.32 which can be achieved in the Band function of alpha=-1.0, beta=-2.5, and Epeak=30 keV. Thus, preliminary analysis shows that Epeak of the burst is very likely around or below 30 keV. Therefore the burst can be classified as an X-ray flash.
GCN Report 99.1
GCN_Report 99.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_99_1.pdf by M.C. Stroh at PSU titled: "Swift Observations of GRB 071031"

Back to JG's homepage

Jochen Greiner, last update: 01-Nov-2007 [Disclaimer]