Gamma-ray Burst 070724

(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 24 Jul 07 10:54:10 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     285948,   Seg_Num: 0
GRB_RA:           27.818d {+01h 51m 16s} (J2000),
                  27.908d {+01h 51m 38s} (current),
                  27.221d {+01h 48m 53s} (1950)
GRB_DEC:         -18.622d {-18d 37' 17"} (J2000),
                 -18.584d {-18d 35' 03"} (current),
                 -18.869d {-18d 52' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2741 [cnts]    Image_Peak=176 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   433     E_range: 15-50 keV
BKG_INTEN:       33347 [cnts]
BKG_TIME:        39213.89 SOD {10:53:33.89} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14305 TJD;   205 DOY;   07/07/24
GRB_TIME:        39230.21 SOD {10:53:50.21} UT
GRB_PHI:          33.38 [deg]
GRB_THETA:        17.24 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.03 [sigma]
IMAGE_SIGNIF:    8.71 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +1  +2  +0  +0 +19  +1 
SUN_POSTN:       123.41d {+08h 13m 39s}  +19.89d {+19d 53' 38"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.45d {+15h 25m 48s}  -23.96d {-23d 57' 27"}
MOON_DIST:       131.66 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       18.39,-27.96 [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 = 311.95,15.57 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:55:25 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     285948,   Seg_Num: 0
GRB_RA:           27.8066d {+01h 51m 13.5s} (J2000),
                  27.8968d {+01h 51m 35.2s} (current),
                  27.2096d {+01h 48m 50.3s} (1950)
GRB_DEC:         -18.5944d {-18d 35' 39.8"} (J2000),
                 -18.5572d {-18d 33' 25.8"} (current),
                 -18.8413d {-18d 50' 28.7"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39296.97 SOD {10:54:56.97} UT,   66.8 [sec] since BAT Trigger Time
CENTROID_X:      313.95,  raw= 314  [pixels]
CENTROID_Y:      345.42,  raw= 345  [pixels]
ROLL:            72.59 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   111.80
GRB_POS_XRT_Z:   27.46
IMAGE_URL:       sw00285948000msxps_rw.img
SUN_POSTN:       123.41d {+08h 13m 39s}  +19.89d {+19d 53' 38"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.46d {+15h 25m 50s}  -23.96d {-23d 57' 37"}
MOON_DIST:       131.67 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.24,-73.82 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.40,-27.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:55:31 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     285948,   Seg_Num: 0
GRB_RA:           27.8066d {+01h 51m 13.5s} (J2000),
                  27.8968d {+01h 51m 35.2s} (current),
                  27.2096d {+01h 48m 50.3s} (1950)
GRB_DEC:         -18.5944d {-18d 35' 39.8"} (J2000),
                 -18.5572d {-18d 33' 25.8"} (current),
                 -18.8413d {-18d 50' 28.7"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39296.97 SOD {10:54:56.97} UT,   66.8 [sec] since BAT Trigger Time
CENTROID_X:      313.95,  raw= 314  [pixels]
CENTROID_Y:      345.42,  raw= 345  [pixels]
ROLL:            72.59 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   111.80
GRB_POS_XRT_Z:   27.46
IMAGE_URL:       sw00285948000msxps_rw.img
SUN_POSTN:       123.41d {+08h 13m 39s}  +19.89d {+19d 53' 38"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.46d {+15h 25m 51s}  -23.96d {-23d 57' 37"}
MOON_DIST:       131.67 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.24,-73.82 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.40,-27.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:55:25 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     285948,   Seg_Num: 0
GRB_RA:           27.8066d {+01h 51m 13.5s} (J2000),
                  27.8968d {+01h 51m 35.2s} (current),
                  27.2096d {+01h 48m 50.3s} (1950)
GRB_DEC:         -18.5944d {-18d 35' 39.8"} (J2000),
                 -18.5572d {-18d 33' 25.8"} (current),
                 -18.8413d {-18d 50' 28.7"} (1950)
GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.44e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.69 [sigma]
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39296.97 SOD {10:54:56.97} UT,   66.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.19 243.61
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       123.41d {+08h 13m 39s}  +19.89d {+19d 53' 38"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.46d {+15h 25m 50s}  -23.96d {-23d 57' 37"}
MOON_DIST:       131.67 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.24,-73.82 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.40,-27.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:56:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.825d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.622d {-18d 37' 19"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39305.18 SOD {10:55:05.18} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.290
N_STARS:         12
X_OFFSET:        432 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1391 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00285948000msufc0074.fits
SUN_POSTN:       123.41d {+08h 13m 39s}  +19.89d {+19d 53' 37"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.47d {+15h 25m 54s}  -23.96d {-23d 57' 49"}
MOON_DIST:       131.64 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.36,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:57:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.825d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.622d {-18d 37' 19"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39305.18 SOD {10:55:05.18} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.290
N_STARS:         12
X_OFFSET:        432 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1391 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00285948000msufc0074.fits
SUN_POSTN:       123.41d {+08h 13m 40s}  +19.89d {+19d 53' 37"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.48d {+15h 25m 55s}  -23.97d {-23d 57' 53"}
MOON_DIST:       131.64 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.36,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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 24 Jul 07 10:58:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.825d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.622d {-18d 37' 19"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39305.18 SOD {10:55:05.18} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     206967307
X_OFFSET:        641 [pixels]
Y_OFFSET:        720 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       801
Y_GRB_POS:       880
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0074.fits
SUN_POSTN:       123.42d {+08h 13m 40s}  +19.89d {+19d 53' 36"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.49d {+15h 25m 57s}  -23.97d {-23d 58' 01"}
MOON_DIST:       131.64 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.36,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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 24 Jul 07 10:58:43 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     285948,   Seg_Num: 0
GRB_RA:           27.818d {+01h 51m 16s} (J2000),
                  27.908d {+01h 51m 38s} (current),
                  27.221d {+01h 48m 53s} (1950)
GRB_DEC:         -18.622d {-18d 37' 17"} (J2000),
                 -18.584d {-18d 35' 03"} (current),
                 -18.869d {-18d 52' 06"} (1950)
GRB_DATE:        14305 TJD;   205 DOY;   07/07/24
GRB_TIME:        39230.21 SOD {10:53:50.21} UT
TRIGGER_INDEX:   433
GRB_PHI:          33.38 [deg]
GRB_THETA:        17.24 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.03 [sigma]
IMAGE_SIGNIF:    8.71 [sigma]
LC_URL:          sw00285948000msb.lc
SUN_POSTN:       123.42d {+08h 13m 40s}  +19.89d {+19d 53' 36"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.49d {+15h 25m 57s}  -23.97d {-23d 58' 03"}
MOON_DIST:       131.63 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       18.39,-27.96 [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 = 311.95,15.57 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 10:58:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.825d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.622d {-18d 37' 19"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39305.18 SOD {10:55:05.18} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     206967307
X_OFFSET:        641 [pixels]
Y_OFFSET:        720 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       801
Y_GRB_POS:       880
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0074.fits
SUN_POSTN:       123.42d {+08h 13m 40s}  +19.89d {+19d 53' 36"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.49d {+15h 25m 57s}  -23.97d {-23d 58' 04"}
MOON_DIST:       131.63 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.36,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 11:04:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39411.03 SOD {10:56:51.03} UT,   180.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.748
N_STARS:         9
X_OFFSET:        321 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1280 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00285948000msufc0180.fits
SUN_POSTN:       123.42d {+08h 13m 41s}  +19.89d {+19d 53' 33"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.54d {+15h 26m 09s}  -23.98d {-23d 58' 48"}
MOON_DIST:       131.60 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 11:04:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39411.03 SOD {10:56:51.03} UT,   180.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.748
N_STARS:         9
X_OFFSET:        321 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1280 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00285948000msufc0180.fits
SUN_POSTN:       123.42d {+08h 13m 41s}  +19.89d {+19d 53' 33"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.54d {+15h 26m 10s}  -23.98d {-23d 58' 52"}
MOON_DIST:       131.60 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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 24 Jul 07 11:05:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39411.03 SOD {10:56:51.03} UT,   180.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     206967413
X_OFFSET:        641 [pixels]
Y_OFFSET:        720 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       801
Y_GRB_POS:       880
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0180.fits
SUN_POSTN:       123.42d {+08h 13m 41s}  +19.89d {+19d 53' 32"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.55d {+15h 26m 12s}  -23.98d {-23d 59' 00"}
MOON_DIST:       131.59 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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 24 Jul 07 11:06:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  39411.03 SOD {10:56:51.03} UT,   180.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     206967413
X_OFFSET:        641 [pixels]
Y_OFFSET:        720 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       801
Y_GRB_POS:       880
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0180.fits
SUN_POSTN:       123.42d {+08h 13m 41s}  +19.89d {+19d 53' 32"}
SUN_DIST:        101.18 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.55d {+15h 26m 13s}  -23.98d {-23d 59' 02"}
MOON_DIST:       131.59 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 11:09:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  40103.78 SOD {11:08:23.78} UT,   873.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.588
N_STARS:         7
X_OFFSET:        321 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1280 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00285948000msufc0873.fits
SUN_POSTN:       123.42d {+08h 13m 42s}  +19.89d {+19d 53' 30"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.59d {+15h 26m 20s}  -23.99d {-23d 59' 31"}
MOON_DIST:       131.57 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 24 Jul 07 11:10:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
POINT_ROLL:      72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  40103.78 SOD {11:08:23.78} UT,   873.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.588
N_STARS:         7
X_OFFSET:        321 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1280 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00285948000msufc0873.fits
SUN_POSTN:       123.42d {+08h 13m 42s}  +19.89d {+19d 53' 30"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.59d {+15h 26m 21s}  -23.99d {-23d 59' 34"}
MOON_DIST:       131.57 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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 24 Jul 07 11:11:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  40103.78 SOD {11:08:23.78} UT,   873.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     206968105
X_OFFSET:        640 [pixels]
Y_OFFSET:        719 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       800
Y_GRB_POS:       879
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0873.fits
SUN_POSTN:       123.42d {+08h 13m 42s}  +19.89d {+19d 53' 30"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.60d {+15h 26m 24s}  -24.00d {-23d 59' 43"}
MOON_DIST:       131.56 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [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:     Tue 24 Jul 07 11:11:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     285948,   Seg_Num: 0
POINT_RA:         27.824d {+01h 51m 18s} (J2000)
POINT_DEC:       -18.620d {-18d 37' 10"} (J2000)
ROLL:            72.594d
IMG_START_DATE:  14305 TJD;   205 DOY;   07/07/24
IMG_START_TIME:  40103.78 SOD {11:08:23.78} UT,   873.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     206968105
X_OFFSET:        640 [pixels]
Y_OFFSET:        719 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       800
Y_GRB_POS:       879
BINNING_INDEX:   1
IM_URL:          sw00285948000msuni0873.fits
SUN_POSTN:       123.42d {+08h 13m 42s}  +19.89d {+19d 53' 29"}
SUN_DIST:        101.19 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      231.60d {+15h 26m 24s}  -24.00d {-23d 59' 46"}
MOON_DIST:       131.56 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      184.35,-73.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.40,-27.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #6654
H. Ziaeepour (UCL-MSSL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), M. De Pasquale (UCL-MSSL), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/GSFC/USRA), H. A. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (Univ. Bicocca & INAF-OAB), B. Sbarufatti (INAF-IASFPA), P. Schady (MSSL-UCL), M. Stamatikos (NASA/ORAU) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 10:53:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070724 (trigger=285948). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 27.818, -18.622 which is
```
  RA(J2000) = 01h 51m 16s
  Dec(J2000) = -18d 37' 17"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a strong spike about one second long at T+0 sec. The peak count rate was ~2700 counts/sec (15-350 keV), at ~0 sec after the trigger. This could be a short burst although the spectrum is not hard.
The XRT began observing the field at 10:54:56 UT, 67 seconds after the BAT trigger. Using prompt downlinked data, we find a variable, uncatalogued X-ray source located at RA, Dec 27.8077, -18.5951 which is
```
   RA(J2000)  = 01 51 13.86
   Dec(J2000) = -18 35 42.4
```
with an uncertainty of 4.7 arcsec (radius, 90% containment). This location is 102 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 6.4e-10 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100s with the White filter starting 75s after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma upper limit is about 19.2 mag. No correction has been made for the expected reddening of E(B-V) of 0.01.
Burst Advocate for this burst is H. Ziaeepour (hz AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #6656
A. Parsons (GSFC), L. Barbier (GSFC), 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/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team):
Using the data set from T-310 to T+ 310 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070724 (trigger #285948) (Ziaeepour, et al., GCN Circ. 6654). The BAT ground-calculated position is RA, Dec = 27.824, -18.610 deg which is
```
    RA(J2000) = 1h 51m 17.9s
    Dec(J2000) = -18d 36' 35"
```
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%.
The mask-weighted light curve for GRB 070724 consists of a single spike peaking at T+0.2 sec. Upon inspection of the mask weighted light curve out to T + 310 sec we find no evidence for extended emission. T90 (15-350 keV) is 0.4 +- 0.04 sec (estimated error including systematics).
The time-averaged spectrum from T-0.0 to T+0.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.33. The fluence in the 15-150 keV band is 3.0 +- 0.7 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.30 sec in the 15-150 keV band is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6658
J. S. Bloom (UC Berkeley) notes:
"The JFN color plates from the Digitized Sky Survey show a blue source in the Northeast portion of the XRT error circle of SHB 070724 (Ziaeepour et al. GCN 6654; Parsons et al. GCN 6656) at position RA= 01:51:14.05, DEC = -18:35:39.1 (J2000). The source appears somewhat extended in the north-south direction; if confirmed with new digital imaging, this would suggest the source as a prime low redshift star-forming host galaxy candidate."
An image may be found at: http://lyra.berkeley.edu/~jbloom/grb070724.png
No need to cite this message.
GCN Circular #6659
K.L Page (U. Leicester) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift-XRT team:
We have analysed the first three orbits of Swift-XRT data obtained for GRB 070724 (Ziaeepour et al., GCN Circ. 6654), which includes ~60 s of Windowed Timing (WT) mode data and ~5.2 ks of Photon Counting (PC) data.
Using 399 s of overlapping XRT PC 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) of RA, Dec (J2000) = 27.80815, -18.59448 which is equivalent to:
```
RA (J2000):   01 51 13.96
Dec (J2000): -18 35 40.1
```
with an uncertainty of 2.2 arcsec (radius, 90% confidence). This is 2.7 arcsec from the initial XRT position (GCN Circ. 6654) and 77.8 arcsec from the ground-calculated BAT position (Parsons et al., GCN Circ. 6656).
The first orbit of XRT data shows flaring activity, with the underlying power-law decay asserting itself from about 500 seconds after the trigger. This decay slope is poorly constrained with the data currently available: alpha ~ 0.4 +0.3/-0.2
Fitting the PC data from the second and third orbits (~4-12 ks after the trigger) in order to avoid any spectral evolution during the flares, the spectrum can be modelled by a power-law of Gamma = 1.3 +0.8/-0.6, absorbed by the Galactic column in this direction of 1.43e20 cm^-2. The 0.3-10 keV observed (unabsorbed) flux during this time is 5.18e-13 (5.27e-13) erg cm^-2 s^-1.
If the decay continues with a slope of alpha ~ 0.4, the count rate at 24 hours is predicted to be 4e-3 count s^-1; this ranges between 2e-3 and 8e-3 count s^-1, taking into account the uncertainties on the slope. Using the spectral fit detailed above, this corresponds to an observed flux of (2 +7/-1)e-13 erg cm^-2 s^-1 (over 0.3-10 keV).
This circular is an official product of the XRT team.
GCN Circular #6660
M. De Pasquale (MSSL-UCL) and H. Ziaeepour (MSSL-UCL) report on the behalf of the Swift UVOT/team:
The Swift/UVOT observed the field of GRB070724 starting 58s after the BAT trigger (Ziaaepour et al. GCN circ. 6654). Inside the refined XRT error circle (Page et al., GCN circ 6659) we do not find any new source, either in the first finding chart exposures in the White and V filter or in the summed exposures of any of the UVOT filters.
The 3 sigma upper limits for detecting a source inside the XRT error circle are:
```
  Filter  T obs (s)  Exp (s)  Mag (3 sigma u.l.)

  White    76-176      98           20.4
   v      182-581     393           19.5
  White   76-5531     380           21.1
   v     182-5941     806           20.0
   b     662-5325     216           20.3
   u     636-6456     332           20.0
  uvw1   612-6352     432           20.4
  uvm2   587-6146     432           20.4
  uvw2   692-5736     432           20.7
```
No correction has been done for the expected low Galactic reddening towards the burst, E(B-V)=0.01 (Schlegel et al. 11998).
GCN Circular #6661
J. S. Bloom and N. R. Butler (UC Berkeley) remark:
"The updated XRT position of GRB 070724 from Page & Ziaeepour (GCN #6659), puts the GRB afterglow closer to the proposed low redshift host (Bloom GCN #6658) seen in the DSS. We emphasize that the galaxy nature of this source has yet to be confirmed; yet, the small offset (<~ 2") is reminiscent of the SHB 050709 (Fox et al. Nature, 437, 845, 2005) and SHB 051221 (Soderberg et al. ApJ, 650, 261, 2006) configurations (see Bloom & Prochaska for an early SHB-host offsets review; AIP Conf. Proc. 838, 473, 2006)." An updated finder can now be found at:
http://lyra.berkeley.edu/~jbloom/grb070724-update1.png
We thank Massimiliano de Pasquale for helpful conversations about the UVOT imaging.
This message could, in principle, be cited.
GCN Circular #6662
A.J. Levan (Warwick), N.R. Tanvir (Leicester), C. Davis (JAC) report on behalf of a large collaboration:
We observed the location of GRB 070724 in the K-band using UKIRT. Two epochs were obtained beginning at 13:11 UT and 14:02 UT. We clearly detect the object refered to by (Bloom GCNC 6658), and confirm that it is indeed a galaxy.
We find no evidence of variability within the galaxy between the two observations. No other objects are detected within the refined XRT error circles of Page & Ziaeepour (GCNC 6659) or Bloom & Butler (GCNC 6661).
Further observations are planned.
GCN Circular #6664
S. B. Cenko, A. Rau (Caltech), E. Berger (Carnegie/Princeton), P. A. Price (IfA), and A. Cucchiara (Penn State) report on behalf of a larger collaboration:
We have imaged the field of GRB070724 (Ziaeepour et al., GCN 6654) on the night of 2007 July 24 UT with the automated Palomar 60-inch telescope (beginning approximately 2.5 minutes after the burst) and the Gemini Multi-Object Spectrograph (GMOS) and Near-Infrared Imager (NIRI) mounted on the 10-m Gemini North Telescope (beginning approximately 2 hours after the burst).
The nearby galaxy first mentioned by Bloom (GCN 6658) shows no sign of variability, either from our P60 to our GMOS imaging (remaining at a constant magnitude of i' ~ 20.3), or within our Gemini imaging (verified with psf-matched digital image subtraction).
In addition the aforementioned galaxy, we find a faint source on the outskirts of the revised XRT error circle (Page and Ziaeepour, GCN 6659) at coordinates (J2000.0):
```
   RA: 01:51:14.05
   Dec: -18:35:42.1
```
with an estimated astrometric uncertainty of approximately 0.3" in each coordinate. The object is only visible in our Gemini/GMOS i' imaging of the field, with a magnitude of i' ~ 24.6 (using GMOS zeropoints from the Gemini webpage). This object is not present in our earlier P60 imaging of the field; however it is well below our detection threshold (see below). As our only two Gemini/GMOS i' images were taken back-to-back, we have no information on the variability of this source at the current time.
No other object is detected in the revised XRT error circle in any other filter. Our limiting magnitudes, calculated with respect to the USNO-B catalog (P60) or using zeropoints from the Gemini website (GMOS and NIRI), are quoted below:
```
Instrument	Filter	UT (July 24)	dt (hr)	Exposure (s)	Magnitude
---------------------------------------------------------------------------
P60		i'	11:13		0.32	3x60 + 3x120	> 21.5
GMOS		i'	13:17		2.38	2x180		> 24.5
NIRI		Ks	13:44		2.83	15x60		> 20.0
NIRI		J	14:02		3.13	15x60		> 22.0
NIRI		H	14:19		3.42	15x60		> 21.0
NIRI		Ks	14:36		3.70	15x60		> 20.0
```
GCN Circular #6665
A. Cucchiara, D. B. Fox (Penn State), S. B. Cenko (Caltech), E. Berger (Carnegie), P. A. Price (IfA) and J. Radomski (Gemini) report on behalf of a larger collaboration:
Starting on 2007 July 25 at 06:40 UT we used GMOS on the Gemini South telescope to obtain a set of 900 seconds spectra of the host galaxy of GRB070724 (Ziaeepour et al., GCN 6654). The covered wavelength range is ~5000-9000 A.
We found strong evidence of emission lines identified as [O II] 3727, Hbeta and [O III] 4959,5007 doublet at redshift z=0.457. This confirms the low-redshift nature of the host galaxy for this short burst as noted by Bloom et al. (GCN 6658).
We wish to thank and acknowledge the effort of the staff at Gemini South in undertaking these observations.
GCN Circular #6666
S. Covino (INAF/OABr), S. Piranomonte (INAF/OAR), S.D. Vergani (DIAS and DCU), P. D'Avanzo (INAF-OABr), L. Stella (INAF/OAR), report on behalf of the MISTICI collaboration:
We observed the afterglow of GRB 070724 (Ziaeepour et al., GCN 6654) with the ESO-VLT equipped with FORS2. Starting on 2007 Jul 25.3735 UT (22.1 hr after the trigger), we acquired 10 minutes of imaging in the I band. Inside the XRT error circle (Page & Ziaeepour, GCN 6659), we detect both objects reported by Bloom (GCN 6658) and Cenko et al. (GCN 6664).
When compared with the photometry reported by Cenko et al. (GCN 6664), none of the objects seems to have faded. The faintest object is pointlike (seeing of 0.7").
We also took two 10-min spectra with VLT+FORS2. Based on detection of [OII] 3727 Hbeta and [OIII] 4959,5007, we confirm the redshift z=0.457 proposed by Cucchiara et al. (GCN 6665).
We thank Brad Cenko for very useful discussion.
GCN Report 74.1
GCN_Report 74.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_74_1.pdf by H. Ziaeepour at UCL/MSSL titled: "Swift observations of GRB 070724"
GCN Circular #6667
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 070724 (GCN 6654) at a frequency of 8.46 GHz on 2007 July 25th at 12.50 UT, 25.4 hours after the burst. Owing to VLA A-array observation, we obtained excellent resolution of 0.33"x0.24". We find four possible sources in the Swift-XRT error box, which are above 3-sigma. These are
```
     Position (J2000)                           Flux density (Jy)

1:   RA 01 51 14.105    +/-  0.002         4.3899E-04 +/-  8.40E-05
     DEC -18 35 45.938  +/-  0.024

2:   RA 01 51 14.125    +/-  0.002         4.0976E-04 +/-  8.51E-05
     DEC -18 35 41.404  +/-  0.021

3:   RA 01 51 13.824    +/-  0.003         3.1155E-04 +/-  8.48E-05
     DEC -18 35 36.626  +/-  0.033

4:   RA 01 51 14.104    +/-  0.003         3.1204E-04 +/-  8.47E-05
     DEC -18 35 40.626  +/-  0.030
```
Here source 4 is closest to Josh Bloom's blue source (GCN 6658) with offset of 1.7 arcsec. Source 2 is closest to P60 afterglow position of the GRB (Cenko et al. GCN 6664) with offset of 1.3 arcsec.
NVSS does not show any radio source around this position. More observations are planned to see the variability of these sources.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #6673
P. D'Avanzo and S. Covino (INAF/OABr) report on behalf of the MISTICI collaboration:
We re-observed the field of the short GRB 070724A (Ziaeepour et al., GCN 6654) with the ESO-VLT equipped with FORS2 (see Covino et al. GCN 6666). An image subtraction analysis, performed with the ISIS package (Alard 200, A&AS, 144, 363) between the two imaging epochs (0.93 and 1.84 days after the burst, respectively), revealed that neither the galaxy reported by Bloom (GCN 6658) and Cenko et al. (GCN 6664) nor the object reported by Cenko et al. (GCN 6664) varied.
GCN Report 74.2
GCN_Report 74.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_74_2.pdf by H. Ziaeepour at UCL/MSSL titled: "Final Swift observations of GRB 070724A"

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Jochen Greiner, last update: 04-Aug-2007 [Disclaimer]