Gamma-ray Burst 070429B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:09:23 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     277582,   Seg_Num: 0
GRB_RA:          328.024d {+21h 52m 06s} (J2000),
                 328.135d {+21h 52m 32s} (current),
                 327.263d {+21h 49m 03s} (1950)
GRB_DEC:         -38.844d {-38d 50' 37"} (J2000),
                 -38.809d {-38d 48' 32"} (current),
                 -39.079d {-39d 04' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2312 [cnts]    Image_Peak=138 [image_cnts]
TRIGGER_DUR:     0.384 [sec] 
TRIGGER_INDEX:   469     E_range: 25-100 keV
BKG_INTEN:       32509 [cnts]
BKG_TIME:        11334.07 SOD {03:08:54.07} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14219 TJD;   119 DOY;   07/04/29
GRB_TIME:        11344.44 SOD {03:09:04.44} UT
GRB_PHI:         -58.77 [deg]
GRB_THETA:        25.37 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.35 [sigma]
IMAGE_SIGNIF:    8.00 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +6  +0  +0 -12  +1 
SUN_POSTN:        36.07d {+02h 24m 16s}  +14.32d {+14d 19' 04"}
SUN_DIST:         82.61 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.76d {+12h 07m 03s}   -2.42d {-02d 24' 57"}
MOON_DIST:       128.45 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.78,-51.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      316.46,-24.29 [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 = 346.46,20.54 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:12:37 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     277582,   Seg_Num: 0
GRB_RA:          328.024d {+21h 52m 06s} (J2000),
                 328.135d {+21h 52m 32s} (current),
                 327.263d {+21h 49m 03s} (1950)
GRB_DEC:         -38.844d {-38d 50' 37"} (J2000),
                 -38.809d {-38d 48' 32"} (current),
                 -39.079d {-39d 04' 43"} (1950)
GRB_DATE:        14219 TJD;   119 DOY;   07/04/29
GRB_TIME:        11344.44 SOD {03:09:04.44} UT
TRIGGER_INDEX:   469
GRB_PHI:         -58.77 [deg]
GRB_THETA:        25.37 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     0.384 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.35 [sigma]
IMAGE_SIGNIF:    8.00 [sigma]
LC_URL:          sw00277582000msb.lc
SUN_POSTN:        36.07d {+02h 24m 16s}  +14.32d {+14d 19' 06"}
SUN_DIST:         82.61 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.78d {+12h 07m 08s}   -2.43d {-02d 25' 43"}
MOON_DIST:       128.43 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.78,-51.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      316.46,-24.29 [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 = 346.46,20.54 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:13:15 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.007d {+21h 52m 02s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 46"} (J2000)
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11588.58 SOD {03:13:08.58} UT,   244.1 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:15:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.007d {+21h 52m 02s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 46"} (J2000)
POINT_ROLL:      64.983d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11591.83 SOD {03:13:11.83} UT,   247.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.698
N_STARS:         29
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00277582000msufc0247.fits
SUN_POSTN:        36.07d {+02h 24m 17s}  +14.32d {+14d 19' 08"}
SUN_DIST:         82.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.80d {+12h 07m 13s}   -2.44d {-02d 26' 18"}
MOON_DIST:       128.40 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:15:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.007d {+21h 52m 02s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 46"} (J2000)
POINT_ROLL:      64.983d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11591.83 SOD {03:13:11.83} UT,   247.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.698
N_STARS:         29
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00277582000msufc0247.fits
SUN_POSTN:        36.07d {+02h 24m 17s}  +14.32d {+14d 19' 09"}
SUN_DIST:         82.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.81d {+12h 07m 13s}   -2.44d {-02d 26' 24"}
MOON_DIST:       128.40 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:16:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.007d {+21h 52m 02s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 46"} (J2000)
ROLL:            64.983d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11591.83 SOD {03:13:11.83} UT,   247.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     199509193
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0247.fits
SUN_POSTN:        36.07d {+02h 24m 17s}  +14.32d {+14d 19' 10"}
SUN_DIST:         82.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.81d {+12h 07m 15s}   -2.44d {-02d 26' 41"}
MOON_DIST:       128.39 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:17:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.007d {+21h 52m 02s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 46"} (J2000)
ROLL:            64.983d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11591.83 SOD {03:13:11.83} UT,   247.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     199509193
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0247.fits
SUN_POSTN:        36.07d {+02h 24m 17s}  +14.32d {+14d 19' 10"}
SUN_DIST:         82.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.82d {+12h 07m 16s}   -2.45d {-02d 26' 45"}
MOON_DIST:       128.38 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:37:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.003d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 45"} (J2000)
POINT_ROLL:      64.986d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12221.55 SOD {03:23:41.55} UT,   877.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.877
N_STARS:         32
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00277582000msufc0877.fits
SUN_POSTN:        36.08d {+02h 24m 20s}  +14.32d {+14d 19' 25"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.96d {+12h 07m 51s}   -2.52d {-02d 31' 26"}
MOON_DIST:       128.24 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:37:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.003d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 45"} (J2000)
POINT_ROLL:      64.986d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12221.55 SOD {03:23:41.55} UT,   877.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.877
N_STARS:         32
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00277582000msufc0877.fits
SUN_POSTN:        36.08d {+02h 24m 20s}  +14.32d {+14d 19' 26"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.96d {+12h 07m 51s}   -2.53d {-02d 31' 31"}
MOON_DIST:       128.24 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:38:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.003d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 45"} (J2000)
ROLL:            64.986d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12221.55 SOD {03:23:41.55} UT,   877.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     199509823
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0877.fits
SUN_POSTN:        36.08d {+02h 24m 20s}  +14.32d {+14d 19' 26"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.97d {+12h 07m 53s}   -2.53d {-02d 31' 44"}
MOON_DIST:       128.23 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:38:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.003d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 45"} (J2000)
ROLL:            64.986d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12221.55 SOD {03:23:41.55} UT,   877.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     199509823
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0877.fits
SUN_POSTN:        36.08d {+02h 24m 20s}  +14.32d {+14d 19' 27"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.97d {+12h 07m 53s}   -2.53d {-02d 31' 49"}
MOON_DIST:       128.23 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:38:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.004d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 44"} (J2000)
POINT_ROLL:      64.985d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12327.08 SOD {03:25:27.08} UT,   982.6 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.831
N_STARS:         32
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00277582000msufc0982.fits
SUN_POSTN:        36.08d {+02h 24m 20s}  +14.32d {+14d 19' 27"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.97d {+12h 07m 54s}   -2.53d {-02d 31' 53"}
MOON_DIST:       128.22 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:39:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.004d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 44"} (J2000)
POINT_ROLL:      64.985d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12327.08 SOD {03:25:27.08} UT,   982.6 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.831
N_STARS:         32
X_OFFSET:        591 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00277582000msufc0982.fits
SUN_POSTN:        36.09d {+02h 24m 20s}  +14.32d {+14d 19' 27"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.98d {+12h 07m 55s}   -2.53d {-02d 32' 00"}
MOON_DIST:       128.22 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:40:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.004d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 44"} (J2000)
ROLL:            64.985d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12327.08 SOD {03:25:27.08} UT,   982.6 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     199509929
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0982.fits
SUN_POSTN:        36.09d {+02h 24m 21s}  +14.32d {+14d 19' 28"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.98d {+12h 07m 56s}   -2.54d {-02d 32' 11"}
MOON_DIST:       128.22 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [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:     Sun 29 Apr 07 03:40:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     277582,   Seg_Num: 0
POINT_RA:        328.004d {+21h 52m 01s} (J2000)
POINT_DEC:       -38.846d {-38d 50' 44"} (J2000)
ROLL:            64.985d
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  12327.08 SOD {03:25:27.08} UT,   982.6 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     199509929
X_OFFSET:        910 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1070
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00277582000msuni0982.fits
SUN_POSTN:        36.09d {+02h 24m 21s}  +14.32d {+14d 19' 28"}
SUN_DIST:         82.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      181.99d {+12h 07m 57s}   -2.54d {-02d 32' 14"}
MOON_DIST:       128.21 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.77,-51.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      316.44,-24.29 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #6358
C. B. Markwardt (GSFC/UMD), L. M. Barbier (NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), J. K. Cannizzo (NASA/UMBC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), S. D. Hunsberger (PSU), W. B. Landsman (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), G. Sato (GSFC/ISAS) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 03:09:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070429B (trigger=277582). Swift slewed to the burst following a 165 second delay due to the Earth-limb constraint. The BAT on-board calculated location is RA, Dec 328.024, -38.844 which is
```
   RA(J2000)  =  21h 52m 06s
   Dec(J2000) = -38d 50' 37"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a short spike with a duration of about 700 msec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
No source was automatically found onboard by the XRT; however, 213s of downlinked data suggest there is a possible source at RA, DEC (degrees) = 328.01551, -38.82670 which is
```
RA(J2000) = 21h 52m 03.7s
Dec(J2000)= -38d 49' 36.1"  
```
with an uncertainty of 9.1 arcsec (90% containment).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 247 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle, and fully covers the possible XRT position. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for reddening of E(B-V)=0.026.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 29 Apr 07 03:54:14 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     277582,   Seg_Num: 0
GRB_RA:          328.0154d {+21h 52m 03.6s} (J2000),
                 328.1266d {+21h 52m 30.3s} (current),
                 327.2544d {+21h 49m 01.0s} (1950)
GRB_DEC:         -38.8267d {-38d 49' 36.1"} (J2000),
                 -38.7921d {-38d 47' 31.5"} (current),
                 -39.0619d {-39d 03' 42.6"} (1950)
GRB_ERROR:       9.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.99e-12 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  14219 TJD;   119 DOY;   07/04/29
IMG_START_TIME:  11600.70 SOD {03:13:20.70} UT,   256.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        36.09d {+02h 24m 23s}  +14.33d {+14d 19' 39"}
SUN_DIST:         82.63 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      182.09d {+12h 08m 21s}   -2.59d {-02d 35' 26"}
MOON_DIST:       128.13 [deg]
MOON_ILLUM:      91 [%]
GAL_COORDS:        3.80,-51.03 [deg] galactic lon,lat of the burst
ECL_COORDS:      316.46,-24.27 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.   
COMMENTS:        This is a tentative source ID based on 10photons.

GCN Circular #6359
B. E. Schaefer (Louisiana State), W. Rujopakarn (U Mich), E.S. Rykoff (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to the short-burst GRB 070429B (Swift trigger 277582; Markwardt et al. GCN 6358), producing images beginning 7.9 s after the GCN notice time. An automated response took the first image at 03:09:30.9 UT, 26.5 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec 20 60-sec exposures, and observations are continuing. These unfiltered images are calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma BAT error circle and within the error circle for the possible XRT source, for both single images and coadding into sets of 10; the field is not crowded. Individual images have limiting magnitudes ranging from 15.5-17.5; we set the following specific limits.
```
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
03:09:30.9 03:09:35.9 5 15.5 26.5 N
03:09:30.8 03:10:56.5 85 17.3 26.4 Y
03:27:43.5 03:39:11.4 687 18.5 1119.1 Y
```
GCN Circular #6360
A.P. Beardmore, K.L. Page, P.A. Evans, R.L.C. Starling (U. of Leicester), C. Guidorzi (INAF-OAB, Univ. Bicocca), and C. Markwardt (GSFC/UMD) report on behalf of the Swift XRT team :
We have analysed the first three orbits of Swift XRT data from GRB 070429B (trigger number 277582, Markwardt et al. GCN circular 6358), which has a total photon counting mode exposure of 5.8ks. Due to a delayed slew because of an Earth-limb constraint, the XRT arrived on the source 244s after the BAT trigger. The tentative X-ray source identified in GCN 6358 is clearly detected in the first orbit of data, and is absent thereafter. The refined XRT position from 2.4ks of data in the first orbit is RA, DEC (J2000) = 328.0159, -38.8284 which is
```
   RA(J2000)  =  21d 52m 03.82s
   DEC(J2000) = -38d 49' 42.2"
```
with an uncertainty of 5.1 arcsec (radius, 90% containment). This is 61 arcsec from the inital BAT position and 6.2 arcsec from the initial X-ray position reported in GCN 6358.
An XRT light curve created from the first orbit of data, binned with a minimum of 10 counts/bin, reveals a decaying source. A powerlaw fit yields a poorly constrained decay slope of 0.94+/-0.47.
The X-ray spectrum from the first orbit (covering 254 to 2691 seconds after the BAT trigger), modelled with an absorbed powerlaw and fit using Cash statistics, gives a photon index of 2.5+1.3-1.2. An upper limit of 5.9e21 cm^-2 on the column density was found, compared with the Galactic value of 1.8E+20 cm^-2 in this direction. The absorbed (unabsorbed) 0.3-10.0keV flux for this spectrum was 5.9E-13 (1.1E-12) ergs cm^-2 s^-1.
Assuming the source continues to decay at the same rate, we predict an XRT count rate of 3.0e-4 count/s at T+24 hours, which corresponds to an observed (unabsorbed) flux of 1.5E-14 (2.8E-14) ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT team.
GCN Circular #6365
J. Tueller (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), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU) on behalf of the Swift-BAT team:
Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070429 (trigger #277582) (Markwardt, et al., GCN Circ. 6358). The BAT ground-calculated position is RA, Dec = 328.006, -38.857 deg which is
```
   RA(J2000)  =  21h 52m 1.4s 
   Dec(J2000) = -38d 51' 24.8" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 66%.
The mask-weighted lightcurve shows 3 or 4 overlapping peaks starting at ~T-0.2s sec and ending at ~T+0.5 sec. T90 (15-350 keV) is 0.5 +- 0.1 sec (estimated error including systematics).
The time-averaged spectrum from T-0.2 to T+0.3 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.71 +- 0.23. The fluence in the 15-150 keV band is 6.3 +- 1.0 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.45 sec in the 15-150 keV band is 1.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6366
P. Schady (MSSL/PSU) and C. Markwardt (GSFC/UMD) report on behalf of the Swift UVOT team:
Swift/UVOT observed the field of GRB 070429B starting 297s after the BAT trigger. No new source is detected either within the refined XRT position (GCN 6360) in any of the UVOT filters, in either single or co-added exposures. The 3-sigma upper limits for the co-added exposures in each filter are as follows:
```
Filter  T_mid(s) Exp.(s) Mag 3-sig UL
White    1009    302     19.68
V        1489    605     19.64
B        1812    184     19.83
U        2092    392     19.80
UVW1     1625    253     19.31
UVM2     1601    253     19.48
UVW2     1682    214     19.63
```
where T_mid is the weighted mid time of the co-added images. The reported upper limits are uncorrected for the estimated Galactic reddening of E(B-V) = 0.03 mag.
GCN Circular #6367
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 a short burst GRB 070429B (GCN 6358) at a frequency of 8.46 GHz on 2007 April 29th at 15.73 UT. The GRB is undetected and the peak radio flux at the SWIFT-XRT position (GCN 6360) is 04+/-100 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #6368
Cucchiara A. (PSU), D. B. Fox, S. B. Cenko, E. Berger:
We observed the refined XRT error circle of GRB 070429B (GCN 6360) with GMOS on the Gemini-South telescope for a total of 900 sec in r-band starting on 2007 April 29 at 07:59:55 UT (~ 4 hr after the burst). Within the XRT error circle we find a single faint object located at:
```
     RA    = 21:52:03.96  (J2000)
     DEC = -38:49:42.79  (J2000)
```
The object appears to be extended and we cannot determine a possible fading at the moment. The r magnitude is 23.18 +- 0.15 calibrated using four stars from USNOB1 catalogue.
We thank the Gemini-South staff for their support.
GCN Report 51.1
GCN_Report 51.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_51_1.pdf by C. Markwardt at CRESST/U.Md/NASA/GSFC titled: "Swift observations of GRB 070429B"
GCN Circular #6370
Cucchiara A. (PSU), S. B. Cenko (Caltech), D. B. Fox (PSU), E. Berger (Carnegie), and J. S. Bloom (UC-Berkeley) report on behalf of a larger collaboration:
We re-analyzed our GMOS imaging data on GRB070429B (Cucchiara et al., GCN 6368). We found the position previously reported for the sole object in the XRT error circle was incorrect. An updated position for this object is:
```
	RA = 21:52:03.729  (J2000)
	DEC = -38:49:42.84  (J2000)
```
This represents an offset of 2.70" W and 0.05" S from our previously reported location. The new position was calculated with respect to several USNO-B1 objects in the field. We estimate a positional uncertainty of 0.3" in each coordinate.
We apologize for any inconvenience this may have caused.
GCN Circular #6372
L.A. Antonelli (INAF-OAR & ASDC), L. Stella (INAF-OAR), G. Tagliaferri (INAF- OABr), E. Jehin, L. Schmidtobreick (ESO),report on behalf of the MISTICI collaboration:
We observed the refined XRT error circle of the short burst GRB 070429B (Beardmore et al, GCN 6360) with VLT-UT1 (Antu) and FORS2 in two different epochs. Images were taken in both the R and B bands starting on Apr. 29 at 09: 26:00 (about 5.5 hr after the burst) for a total exposure time of 900 sec in R band and 600 sec in B band. Another image of the field was taken in the R band only starting on Apr. 30 at 09:10:56 UT (about 29.5 hr after the burst) for a total exposure time of 1800 sec under better seeing conditions.
At both epochs we found two objects within the XRT error circle:
Object A is located well within the XRT error circle at:
```
     RA    = 21:52:03.7
     DEC = -38:49:42.9
```
Object B is located close to the border of the XRT error circle at:
```
     RA    = 21:52:03.4
     DEC = -38:49:43.1
```
Coordinates are J2000 and with an error of 0.2".
Object A was detected in R band at both epochs with good S/N. It appears to be extended and consistent with the revised position of the object observed by Cucchiara et al (GCN 6370); its R magnitude is 23.2 +- 0.2, calibrated by using the USNO B1 catalogue. Object A was only marginally detected in the B band. Object B was marginally detected in the first R band observation, with a better detection during the second night at a R mag of 24.6+-0.3. Also object B seems extended.
We find no evidence of a fading behaviour in either objects. Most likely one of them represents the host galaxy of GRB070429B.
We thank the ESO Paranal staff for their excellent support.
This message can be cited.
GCN Circular #6604
M. Nysewander, A. Fruchter and J. Graham (STScI) report on behalf of a larger collaboration:
We observed the entire BAT error circle of the short GRB 070429B (Markwardt et al. GCN 6358) with ISPI on the Blanco 4-m at CTIO at a mean time of 06:10:28 UT on April 30, 2007 (1.13 days post burst) in 18 x 60-s J-band exposures, and again at a mean time of 06:23:04 UT on June 2, 2007, (34.2 days post burst) with the same exposure sequence.
Due to the questionable nature of the faint XRT afterglow candidate (Beardmore et al. GCN 6360), we searched the entire BAT error circle by subtracting the two epochs using ISIS2 (Alard, 2000). We do not find any variation between the two epochs to the limiting magnitude of the first epoch, J ~ 21.5. Specifically, the source within the XRT error circle noted by Cucchiara et al. (GCN 6368) also did not vary between the two epochs.
GCN Circular #7140
D. A. Perley, J. S. Bloom, M. Modjaz, D. Poznanski (UC Berkeley) and C. C. Thoene (DARK) report:
On the night of 2007-07-18 we re-observed the field of GRB 070429B (GCN 6358, Markwardt et al.), likely to be a short-hard burst (T90 = 0.5 +- 0.1 s, GCN 6365, Tueller et al.) under photometric conditions using the Keck I telescope + LRIS, in g and R filters simultaneously for a total integration of 930s(g) / 840s(R) under relatively poor seeing. We further imaged the field using GMOS on Gemini-South on 2007-11-27 for 1200s in r filter under excellent seeing.
The bright source reported by Cucchiara et al. (GCN 6368), designated object "A" by Antonelli et al. (GCN 6372) and likely the host galaxy of the GRB, is well-detected in R and r and weakly detected in g. Using Landolt standard stars we measure an aperture magnitude for this object (in a 2.1" radius aperture) of
```
g = 24.79 +/- 0.14
R = 23.24 +/- 0.05
```
This is consistent within errors with the magnitudes reported by Cucchiara et al. and Antonelli et al. 4 and 5 hours after the burst, respectively. Image subtraction of the new Gemini imaging versus the earlier epoch (GCN 6368) reveals no variability to a limiting magnitude of R > 24.5, ruling out an afterglow contribution in the first epoch (4.84 hours after the burst) at this level.
Object "B" is also detected in both filters, and also shows no evidence for variability.
On the night of 2007-10-09 we performed longslit spectroscopy covering both targets ("A" and "B") in two integrations of 1500s each, using Keck I + LRIS.
The trace of object "A" is faint and the spectrum is mostly featureless, but a faint line signature is observed centered at 7098 Angstroms, with a FWHM of 6 Angstroms. The feature appears present in both exposures, though this site is severely affected by a cosmic ray in one exposure. We identify this feature as most likely being the [OII]3727 doublet. Other line identifications (H-alpha, H-beta, or [OIII]) are disfavored due to the absence of corroborating lines that would be expected over our spectral range (3500-8900 Angstroms) in those cases.
Association of this feature with [OII] indicates a redshift for this object of z=0.904. Calibrating relative to R-band photometry, we estimate a preliminary line flux of 3e-17 erg/s/cm^2, corresponding to an unextincted star formation rate (Kewley et al. 2002) of 0.7 M_sun/yr, comparable to that observed in previous short burst hosts. We note also the red color of this galaxy.
No obvious trace or line features are observed for object B.
GCN Circular #7145
Holland, S. T. (CRESST/USRA/GSFC), de Pasquale, M. (UCL/MSSL), and Markwardt, C.~B. (CRESST/GSFC/UMD) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of the short-hard GRB 070429B starting 230 s after the BAT trigger (Markwardt, et al., GCN Circ. 6358). We have re-examined this data in light of the redshift for the Antonelli, et al. (GCN Circ. 6372) source "A" reported by Perley, et al. (GCN Circ. 7140). We find weak evidence in the UVOT data for a fading source located inside the refined XRT error circle (Beardmore, et al., GCN Circ. 6360) at
```
       RA =  21:52:03.68 (J2000)
      Dec = -38:49:43.6  (J2000)
```
with an uncertainty of 0.6 arcsec (90% confidence). This is 0.6 arcsec from the ground-based position of source "A". For a redshift of z = 0.904, and (H_0,Omega_M,Omega_Lambda) = (70,0.3,0.7) this corresponds to 4.7 proper kpc. This possible source is detected with a 3.9-sigma significance in a summed image (summed over all seven filters) between 591 and 2661 s after the BAT trigger. It is not detected in subsequent all-filter summed images. This possible UVOT source has the following magnitudes and upper limits. All magnitudes are on the UVOT system described in Poole, et al. (2007, MNRAS, in press).
```
Filter    T_start   T_stop   Exposure    Mag   Err  Significance
    v         2002     2661      94       19.3  0.4      2.5
              6805     7004     393      >20.1  3-sigma upper limit
    b         1460     2598     156       20.5  0.5      2.2
            34,978   35,884     885      >22.0  3-sigma upper limit
    u          403   42,285    2260      >21.8  3-sigma upper limit
   uvw1        379   41,789    3075      >22.4  3-sigma upper limit
   uvm2        354   20,226    2192      >22.0  3-sigma upper limit
   uvw2        456   30,222    2378      >22.4  3-sigma upper limit
  white        591      977     117       21.6  0.5      2.2
              6395     8027     393      >22.1  3-sigma upper limit
```
The observations where the suspected source is weakly detected are all at less than one hour after the BAT trigger. The earliest reported ground-based detection of source "A" is Cucchiara, et al. (GCN Circ. 6368) who find r = 23.18 +/- 0.15 at approximately 4 hours. Perley, et al. (GCN Circ. 7140) find R = 23.24 +/- 0.05 at approximately 7 months, which implies that the source did not fade, and conclude that the "A" source is the host galaxy. They also find g = 24.29 +/- 0.14 at this time. If we assume that the SDSS g band is approximately similar to the UVOT v band then the expected v magnitude of the host at 2332 s (assuming a constant magnitude) is v ~= 24.3, which is 5 mag fainter than the UVOT detection at that time. This corresponds to a mean decay index of alpha ~= -2.5.
The observed decay power-law indices from the UVOT data are alpha_v <= -0.6 +/- 0.3, alpha_b <= -0.5 +/- 0.2, and alpha_white <= -0.2 +/- 0.2. The shallow decay slope in the white filter, and the faintness of the White detection at early time (t_mid = 784 s) relative to the b and v detections at later times (t_mid = 2332 (v), 2029 (b)) suggest that the afterglow candidate may have increased in luminosity at some point between approximately 784 and 2029 s.
We do not detect any source at the position of source "B" (Antonelli, et al., GCN Circ. 6372) down to the following limiting magnitudes.
```
Filter    T_start   T_stop   Exposure    3-Sigma Upper Limit
    v         230    31,793     2011        >21.5
    b         427    35,115     1463        >22.3
    u         403    42,285     2260        >21.9
  uvw1        379    41,789     3075        >22.4
  uvm2        354    20,226     2192        >22.0
  uvw2        456    30,222     2378        >22.4
  white       247    36,269     1088        >22.7
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.03 mag (Schlegel, et al. 1998).

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Jochen Greiner, last update: 10-Dec-2007 [Disclaimer]