Gamma-ray Burst 061007

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:08:26 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     232683,   Seg_Num: 0
GRB_RA:           46.318d {+03h 05m 16s} (J2000),
                  46.371d {+03h 05m 29s} (current),
                  45.921d {+03h 03m 41s} (1950)
GRB_DEC:         -50.488d {-50d 29' 15"} (J2000),
                 -50.462d {-50d 27' 41"} (current),
                 -50.681d {-50d 40' 50"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8020 [cnts]    Image_Peak=384 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       26937 [cnts]
BKG_TIME:        36470.50 SOD {10:07:50.50} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14015 TJD;   280 DOY;   06/10/07
GRB_TIME:        36488.81 SOD {10:08:08.81} UT
GRB_PHI:         109.77 [deg]
GRB_THETA:        36.05 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     73.18 [sigma]
IMAGE_SIGNIF:    15.62 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3 +19  +0  +0 +45  +1 
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 23"}
SUN_DIST:        117.02 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.76d {+01h 03m 02s}   +8.90d {+08d 53' 55"}
MOON_DIST:        65.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.66,-55.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.70,-62.98 [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 = 174.62,-15.11 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:09:55 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     232683,   Seg_Num: 0
GRB_RA:           46.3316d {+03h 05m 19.5s} (J2000),
                  46.3852d {+03h 05m 32.4s} (current),
                  45.9354d {+03h 03m 44.4s} (1950)
GRB_DEC:         -50.5006d {-50d 30' 02.1"} (J2000),
                 -50.4746d {-50d 28' 28.5"} (current),
                 -50.6935d {-50d 41' 36.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       49 [cnts]
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36569.26 SOD {10:09:29.26} UT,   80.5 [sec] since BAT Trigger Time
CENTROID_X:      314.39,  raw= 314  [pixels]
CENTROID_Y:      292.10,  raw= 292  [pixels]
ROLL:            141.98 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -15.77
GRB_POS_XRT_Z:   30.88
IMAGE_URL:       sw00232683000msxps_rw.img
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 24"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.77d {+01h 03m 06s}   +8.91d {+08d 54' 20"}
MOON_DIST:        65.06 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the burst
ECL_COORDS:       14.70,-63.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:09:54 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     232683,   Seg_Num: 0
GRB_RA:           46.3316d {+03h 05m 19.5s} (J2000),
                  46.3852d {+03h 05m 32.4s} (current),
                  45.9354d {+03h 03m 44.4s} (1950)
GRB_DEC:         -50.5006d {-50d 30' 02.1"} (J2000),
                 -50.4746d {-50d 28' 28.5"} (current),
                 -50.6935d {-50d 41' 36.7"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.36e-08 [erg/cm2/sec]
GRB_SIGNIF:      7.00 [sigma]
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36569.26 SOD {10:09:29.26} UT,   80.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.60 237.19 261.33 243.32
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 24"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.77d {+01h 03m 06s}   +8.91d {+08d 54' 20"}
MOON_DIST:        65.06 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the burst
ECL_COORDS:       14.70,-63.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:09:59 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     232683,   Seg_Num: 0
GRB_RA:           46.3316d {+03h 05m 19.5s} (J2000),
                  46.3852d {+03h 05m 32.4s} (current),
                  45.9354d {+03h 03m 44.4s} (1950)
GRB_DEC:         -50.5006d {-50d 30' 02.1"} (J2000),
                 -50.4746d {-50d 28' 28.5"} (current),
                 -50.6935d {-50d 41' 36.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       49 [cnts]
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36569.26 SOD {10:09:29.26} UT,   80.5 [sec] since BAT Trigger Time
CENTROID_X:      314.39,  raw= 314  [pixels]
CENTROID_Y:      292.10,  raw= 292  [pixels]
ROLL:            141.98 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -15.77
GRB_POS_XRT_Z:   30.88
IMAGE_URL:       sw00232683000msxps_rw.img
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 25"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.77d {+01h 03m 06s}   +8.91d {+08d 54' 22"}
MOON_DIST:        65.06 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the burst
ECL_COORDS:       14.70,-63.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:11:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.344d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.503d {-50d 30' 10"} (J2000)
POINT_ROLL:      141.981d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36578.73 SOD {10:09:38.73} UT,   89.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.094
N_STARS:         62
X_OFFSET:        336 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0089.fits
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 26"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.79d {+01h 03m 10s}   +8.91d {+08d 54' 50"}
MOON_DIST:        65.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:12:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.344d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.503d {-50d 30' 10"} (J2000)
POINT_ROLL:      141.981d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36578.73 SOD {10:09:38.73} UT,   89.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.094
N_STARS:         62
X_OFFSET:        336 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0089.fits
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 27"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.79d {+01h 03m 11s}   +8.92d {+08d 54' 59"}
MOON_DIST:        65.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:12:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.344d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.503d {-50d 30' 10"} (J2000)
ROLL:            141.981d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36578.73 SOD {10:09:38.73} UT,   89.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     181908580
X_OFFSET:        756 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0089.fits
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 27"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.80d {+01h 03m 12s}   +8.92d {+08d 55' 12"}
MOON_DIST:        65.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:12:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     232683,   Seg_Num: 0
GRB_RA:           46.318d {+03h 05m 16s} (J2000),
                  46.371d {+03h 05m 29s} (current),
                  45.921d {+03h 03m 41s} (1950)
GRB_DEC:         -50.488d {-50d 29' 15"} (J2000),
                 -50.462d {-50d 27' 41"} (current),
                 -50.681d {-50d 40' 50"} (1950)
GRB_DATE:        14015 TJD;   280 DOY;   06/10/07
GRB_TIME:        36488.81 SOD {10:08:08.81} UT
TRIGGER_INDEX:   155
GRB_PHI:         109.77 [deg]
GRB_THETA:        36.05 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     73.18 [sigma]
IMAGE_SIGNIF:    15.62 [sigma]
LC_URL:          sw00232683000msb.lc
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 27"}
SUN_DIST:        117.02 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.80d {+01h 03m 13s}   +8.92d {+08d 55' 14"}
MOON_DIST:        65.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.66,-55.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.70,-62.98 [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 = 174.62,-15.11 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:13:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.344d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.503d {-50d 30' 10"} (J2000)
ROLL:            141.981d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36578.73 SOD {10:09:38.73} UT,   89.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     181908580
X_OFFSET:        756 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0089.fits
SUN_POSTN:       192.89d {+12h 51m 34s}   -5.52d {-05d 31' 28"}
SUN_DIST:        117.00 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.81d {+01h 03m 13s}   +8.92d {+08d 55' 18"}
MOON_DIST:        65.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #5706
E.S. Rykoff (U Mich), W. Rujopakarn (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 061007 (Swift trigger 232683). The first image was at 10:08:35.2 UT, 26.4 s after the burst (9.2 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new object, not visible in the DSS (second epoch), with coordinates:
03:05:19.6 -50:30:02.5 (J2000), with positional uncertainty of 1" or better
```
start UT    	mag     mlim(of image)
----------------------------------
10:08:35.2     13.6     14.8
```
A jpeg image is available at http://www.rotse.net/images/gsb232683_3a00_img.jpg Note that the object marked 13 is the candidate in question.
Continuing observations are in progress.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:18:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36684.01 SOD {10:11:24.01} UT,   195.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.987
N_STARS:         33
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0195.fits
SUN_POSTN:       192.90d {+12h 51m 35s}   -5.53d {-05d 31' 33"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.86d {+01h 03m 26s}   +8.95d {+08d 56' 55"}
MOON_DIST:        65.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:19:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36684.01 SOD {10:11:24.01} UT,   195.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.987
N_STARS:         33
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0195.fits
SUN_POSTN:       192.90d {+12h 51m 35s}   -5.53d {-05d 31' 33"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.86d {+01h 03m 27s}   +8.95d {+08d 56' 59"}
MOON_DIST:        65.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:19:59 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36684.01 SOD {10:11:24.01} UT,   195.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     181908685
X_OFFSET:        756 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0195.fits
SUN_POSTN:       192.90d {+12h 51m 35s}   -5.53d {-05d 31' 34"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.87d {+01h 03m 29s}   +8.95d {+08d 57' 15"}
MOON_DIST:        65.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:20:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  36684.01 SOD {10:11:24.01} UT,   195.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     181908685
X_OFFSET:        756 [pixels]
Y_OFFSET:        931 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       1091
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0195.fits
SUN_POSTN:       192.90d {+12h 51m 35s}   -5.53d {-05d 31' 34"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.87d {+01h 03m 29s}   +8.96d {+08d 57' 19"}
MOON_DIST:        65.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:29:35 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37361.81 SOD {10:22:41.81} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.031
N_STARS:         24
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0872.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 43"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.96d {+01h 03m 50s}   +9.00d {+09d 00' 00"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:29:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37361.81 SOD {10:22:41.81} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.031
N_STARS:         24
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc0872.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 44"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.96d {+01h 03m 51s}   +9.00d {+09d 00' 07"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:30:23 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37361.81 SOD {10:22:41.81} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     181909363
X_OFFSET:        755 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0872.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 44"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.97d {+01h 03m 52s}   +9.00d {+09d 00' 14"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:30:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.984d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37361.81 SOD {10:22:41.81} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     181909363
X_OFFSET:        755 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni0872.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 44"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.97d {+01h 03m 53s}   +9.01d {+09d 00' 19"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [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:     Sat 07 Oct 06 10:31:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.983d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37769.40 SOD {10:29:29.40} UT,   1280.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.047
N_STARS:         21
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc1280.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 45"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.98d {+01h 03m 55s}   +9.01d {+09d 00' 31"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:31:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
POINT_ROLL:      141.983d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37769.40 SOD {10:29:29.40} UT,   1280.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.047
N_STARS:         21
X_OFFSET:        436 [pixels]
Y_OFFSET:        611 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1570 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00232683000msufc1280.fits
SUN_POSTN:       192.90d {+12h 51m 37s}   -5.53d {-05d 31' 45"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.98d {+01h 03m 55s}   +9.01d {+09d 00' 38"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:32:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.983d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37769.40 SOD {10:29:29.40} UT,   1280.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     181909770
X_OFFSET:        755 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni1280.fits
SUN_POSTN:       192.91d {+12h 51m 37s}   -5.53d {-05d 31' 46"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.99d {+01h 03m 57s}   +9.01d {+09d 00' 51"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 07 Oct 06 10:32:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     232683,   Seg_Num: 0
POINT_RA:         46.345d {+03h 05m 23s} (J2000)
POINT_DEC:       -50.505d {-50d 30' 16"} (J2000)
ROLL:            141.983d
IMG_START_DATE:  14015 TJD;   280 DOY;   06/10/07
IMG_START_TIME:  37769.40 SOD {10:29:29.40} UT,   1280.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     181909770
X_OFFSET:        755 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00232683000msuni1280.fits
SUN_POSTN:       192.91d {+12h 51m 37s}   -5.53d {-05d 31' 46"}
SUN_DIST:        116.99 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       15.99d {+01h 03m 58s}   +9.02d {+09d 00' 54"}
MOON_DIST:        65.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      264.67,-55.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       14.71,-63.00 [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 #5707
P. Schady (MSSL-UCL), J. R. Cummings (NASA/UMBC), C. Guidorzi (Univ Bicocca&INAF-OAB), C. Pagani (PSU), D. M. Palmer (LANL), S. B. Pandey (UCL-MSSL), P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU), L. Vetere (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 10:08:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061007 (trigger=232683). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 46.318, -50.488 {03h 05m 16s, -50d 29' 15"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 100 sec. The peak count rate was ~25000 counts/sec (15-350 keV), at ~54 sec after the trigger.
The XRT began observing the field at 10:09:29 UT, 80 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source located at RA(J2000) = 03h 05m 19.5s, Dec(J2000) = -50d 30' 02.1", with an estimated uncertainty of 7.5 arcseconds (90% confidence radius). This location is 55 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 0.1s image was 3.4e-08 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 400 seconds with the V filter starting 195 seconds after the BAT trigger. There is a very bright source in the 2.7' x 2.7' sub-image not present in DSS at RA(J2000) = 03:05:19.51 = 46.3313 DEC(J2000) = -50:30:02.5 = -50.5007 with a 1-sigma error radius of about 0.5 arc sec. This position is 0.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 12.8 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction of about 0.1 magnitudes.
GCN Circular #5708
C.G. Mundell (Liverpool JMU), C. Guidorzi (Univ Bicocca & INAF-OAB), A. Gomboc (University of Ljubljana), C.J. Mottram, A. Melandri, I.A. Steele, R.J. Smith, A. Monfardini, D. Carter, S. Kobayashi, D. Bersier, (Liverpool JMU), E. Rol, P. O'Brien, N. Bannister (Leicester) report:
"The 2-m Faulkes Telescope South (Siding Spring, Australia) robotically followed up GRB061007 (SWIFT trigger 232683; Schady et al. GCN #5705) 2.28 min after the GRB trigger time. We find a fading source at the position reported by Rykoff et al. (GCN #5706) and Schady et al. (GCN # 5705) and confirm it to be the afterglow of GRB 061007.
Observations and analysis are ongoing."
GCN Circular #5709
D. Bersier , C.G. Mundell (Liverpool JMU), C. Guidorzi (Univ Bicocca & INAF-OAB), A. Gomboc (U. Ljubljana), A. Melandri, C.J. Mottram, I.A. Steele, R.J. Smith, A. Monfardini, D. Carter, S. Kobayashi, (Liverpool JMU), E. Rol, P. O'Brien, N. Bannister (Leicester) report:
We observed the optical counterpart of GRB 061007 (GCN 5706, 5707, 5708) with the 2m Faulkes Telescope South (Siding Spring). At 142 sec after trigger time, we measure a magnitude of mR=10.15 +/- 0.04 (calibration based on USNOB1 R2 mag, which may introduce a 0.3 mag systematic uncertainty). When compared to the magnitude measured by ROTSE (m=13.6, GCN 5706), this implies a subtantial brightening in the first 2.5 minutes (more than a factor of 10 between 26 and 142 seconds).
From 142s on, the OT is seen to decay. For the next three hours, the decay followed a power law with an index of about -1.55 +/- 0.05.
The position of the afterglow is 03:05:19.56, -50:30:2.7 +/- 1.2"
Observations and analysis are continuing.
GCN Circular #5712
L. Vetere, C. Pagani, D. N. Burrows (PSU) and P. Schady (MSSL-UCL) report on behalf of the Swift XRT team:
We have analysed the first 3 orbits of XRT data from GRB 061007. This is one of the brightest GRB afterglow ever observed by XRT. A 5.2ks photon counting mode image provides a refined XRT position:
```
RA(J2000)  =  03 05 19.1
Dec(J2000) = -50 30 01.5
```
with an uncertainty of 5 arcsec (90% containment). This position is 3.8 arcsec away from the on-board XRT position and 4 arcsec away from UVOT position (Schady et al. GCN 5707).
The X-ray light curve shows a rapid decay with a slope of -1.6 +/-0.1. A power-law fit to the WT spectrum gives a photon index of 2.36 +/- 0.2 and a column density of (2.2 +/- 0.2)e21 cm**-2. We note the galactic hydrogen column density in the direction of the burst is 2.13e20cm**-2. The 0.2-10.0 keV observed mean flux during WT observation is 1.46e-07 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 2.98e-07 ergs cm**-2 s**-1.
If the burst continues decaying at the current rate we estimate an XRT count rate of 0.0069 counts/s at T + 24hr, which corresponds to an observed 0.2-10.keV flux of 5.7e-11 ergs cm**-2 s**-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5713
C. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), P. Schady (MSSL-UCL), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-58 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061007 (trigger #232683) (Schady, et al., GCN Circ. 5707). The BAT ground-calculated position is RA,Dec = 46.299, -50.496 deg {3h 5m 11.8s, -50d 29' 47.4"} (J2000) +- 0.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 19%. Before T-58 sec, the burst location was not in BAT's FOV, but there is no detection through the side of the instrument of any significant earlier emission.
The lightcurve shows three large peaks, each with several seconds rise and fall and a roughly flat top, and each including several sub-peaks. The first lasts from T-5 to T+15, the second from T+23 to T+40, and the third from T+40 to T+65 sec. There is a smaller peak starting at T+75, rising to a flat top from T+78 to T+80 and then declining with a very long roughly exponential decay. Emission is weakly detectable until around T+900 sec. T90 (15-350 keV) is 75 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T-4.1 to T+231.8 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.13 +- 0.03. The fluence in the 15-150 keV band is 4.5 +- 0.1 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+45.14 sec in the 15-150 keV band is 15.3 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5714
L. Vetere, C. Pagani, D. N. Burrows (PSU) and P. Schady (MSSL-UCL) report on behalf of the Swift XRT team:
The WT spectrum of GRB 061007 given in GCN 5712 has been erroneously computed. The correct values are given in following paragraphs.
A power-law fit to the WT spectrum gives a photon index of 2.1 +/- 0.2 and a column density of (1.4 +/- 0.2)e21 cm**-2. We note the galactic hydrogen column density in the direction of the burst is 2.13e20cm**-2. The 0.2-10.0 keV observed mean flux during WT observation is 1.5e-09 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 2.2e-09 ergs cm**-2 s**-1.
If the burst continues decaying at the current rate we estimate an XRT count rate of 0.0069 counts/s at T + 24hr, which corresponds to an observed 0.2-10.keV flux of 4.2e-13 ergs cm**-2 s**-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5715
David Osip (Las Campanas Observatory), H.-W. Chen (U Chicago), and J. X. Prochaska (UCO/Lick Observatory) report on behalf of a larger collaboration:
"We observed the afterglow of GRB061007 reported by Rykoff & Rujopakarn (GCN 5706) and confirmed by Mundel et al. (GCN5708) and Bersier et al., using the LDSS3 with a 0.75-arcsec slit on the Magellan Clay telescope at the Las Campanas Observatory. The observations started at 03:54:00 UT on October 8, 2006, ~ 18 hours after the inital Swift/BAT trigger, and were carried out under a mean seeing condition of 0.75 arcsec in a sequence of five 1200-sec exposures. The final stacked spectrum covers the spectral range from 3900 Ang to 6500 Ang with a spectral resolution element of 2.4 Ang. In the spectrum, we identify a strong MgII absorption system, accompanied with FeII 2344 and 2600 transitions) at z=1.261. We consider this the likely redshift of GRB061007, given the absence of a strong Lya feature (or any other strong metal-line transitions) in our spectrum. We also report an intervening MgII system at z=1.06.
Further analysis is underway.
This message may be cited."
GCN Circular #5716
Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo (DARK, NBI), Nial Tanvir and Evert Rol (U. Leicester) report on behalf of a larger collaboration:
Using FORS1 on the Very Large Telescope, we have obtained 3*30 min spectra (300V grating) of the GRB 061007 field (Schady et al., GCN 5707). The acquisition image shows that the optical afterglow (Rykoff & Rujopakarn, GCN 5706) has R ~ 21.5 on Oct 8.150 (0.727 days post-burst). It is likely that the host contributes somewhat to the measured flux.
The combined spectrum shows an emission line, presumably corresponding to [O II] 3727 at z = 1.262. At his redshift we find several other absorption features, including Mg II and Fe II, consistent with the findings of Osip et al. (GCN 5715). We also detect the intervening Mg II system at z =1.065.
We thank the Paranal staff for excellent support.
GCN Circular #5719
P. Schady (MSSL/UCL) and S. Pandey (MSSL/UCL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began taking data in the field of GRB061007 on 2006-10-07, 80s after the BAT trigger (Schady et al., GCN 5707), discounting the 10s settling image. The afterglow reported by Rykoff & Rujopakarn (GCN 5706), is clearly detected in all six UVOT lenticular filters, and decaying rapidly with a decay index of ~1.6. The refined position of the afterglow is RA = 03:05:19.6, Dec= -50:30:02.4 (J2000).
The magnitude of the afterglow in each UVOT filter are given below for the first exposure taken, and the first long exposure of duration 197s. In the case of the UVW2 filter, the exposures after 619s after the BAT trigger had to be coadded to get a detection.
```
Filter  T+(s)   Exp(s)  Mag
V       395     393     12.84 +/- 0.01
         6397    197     17.93 +/- 0.01

B       678     10      14.42 +/- 0.08
         5783    197     18.30 +/- 0.08

U       657     19      14.13 +/- 0.05
         5578    197     17.77 +/- 0.07

UVW1    635     19      14.89 +/- 0.08
         6807    197     19.29 +/- 0.31

UVM2    611     19      16.10 +/- 0.15
         6602    197	20.30 +/- 0.69 (1sig)

UVW2    711     19      16.75 +/- 0.17
         14813   1279    20.96 +/- 0.36 (1sig)
```
T+ is the start time of the exposure since the BAT trigger. In the second reported UVW2 exposure T+ is the midtime of 3 coadded exposures. These magnitudes are not corrected for the expected extinction of E(B-V)=0.021, or for coincidince loss.
GCN Circular #5720
A.J. van der Horst (University of Amsterdam) and E. Rol (University of Leicester) report on behalf of a larger collaboration:
"We observed the position of the GRB 061007 afterglow at 4.8, 8.6 and 19 GHz with the Australia Telescope Compact Array at October 8 10.25 UT to 15.84 UT, i.e. 1.00 - 1.24 days after the burst (GCN 5707). We do not detect a radio source at the position of the optical afterglow (GCN 5706). The formal flux measurement for a point source at the location of the optical afterglow is -25 +/- 45 microJy at 4.8 GHz, -13 +/- 47 microJy at 8.6 GHz, and -1 +/- 37 microJy at 19 GHz.
We would like to thank the staff of the Australia Telescope National Facility, in particular Baerbel Koribalski, for obtaining these Target of Opportunity observations."
GCN Circular #5722
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
The long bright GRB 061007 (Swift-BAT trigger #232683; Schady et al., GCN 5707; Markwardt et al., GCN 5713) triggered Konus-Wind at 2006-10-07 T0=36489.344 s UT (10:08:09.344).
As observed by Konus-Wind it had a duration of ~90 s, fluence 2.49(-0.12, +0.17)x10^-4 erg/cm2, the 64-ms peak flux measured from T0+39.488 1.95(-0.24, +0.31)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the GRB (from T0 to T0+87.296 s) is well fitted (in the 20 keV - 10 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -0.70 +/- -0.04, the high energy photon index beta = -2.61 (-0.21, +0.15), the peak energy Ep = 399 (-18, +19) keV (chi2 = 97/84 dof).
The spectrum of the burst maximum (accumulated from T0+38.656 s to T0+40.704 s) is well fitted (in the 20 keV - 10 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -0.53 (-0.08, +0.09), the high energy photon index beta = -2.61 (-0.49, +0.25), the peak energy Ep = 498 (-48, +54) keV (chi2 = 51/66 dof).
Assuming z = 1.26 (Osip al., GCN 5715; Jakobsson et al., GCN 5716) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.3, Omega_\Lambda = 0.7, the isotropic energy release is E_iso ~1.0x10^54 erg, and the maximum luminosity is (L_iso)_max ~1.8x10^53 erg/s.
All the quoted errors are at the 90% confidence level.
GCN Circular #5724
K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, T. Takahashi, T. Asano, T. Uehara, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Suzuki, T. Tamagawa (RIKEN), M. Tashiro, K. Abe, K. Onda, Y. Sato, M. Suzuki, Y. Urata (Saitama U.), T. Enoto, R. Miyawaki, K. Kokubun, K. Makishima (Univ. of Tokyo), K. Nakazawa, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), on behalf of the Suzaku WAM team report:
The bright, long burst, GRB 061007 (Schady et al., GCN 5707; Markwardt et al., GCN 5713), triggered the Suzaku Wide-band All-sky Monitor (WAM), which covers the energy range of 50 keV - 5 MeV, at 10:08:05.627 (UT). Three large peaks as well as a following smaller peak (GCN 5713) were clearly seen in the WAM light curve. The T90 duration was about 59 seconds. The fluence in 100 - 1000 keV was 1.38x10-4 erg/cm2, while the 1-s peak flux was 14.3 (-1.0,+0.3) photons/cm2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum is well-described with a GRB Band model as follows.
```
  the low-energy photon index alpha: -0.68 +- 0.11, 
  the high-energy photon index beta: -2.87 (-0.60, +0.28), 
  the break energy E0:       425 (-51, +58) keV,
  and the peak energy Epeak: 561 (-27, +29) keV.
```
All the quoted errors are at statistical 90% confidence level, while systematic errors are not included.
The WAM light curve of this event is available at http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/grb_table.html
GCN Circular #5725
C. Wigger, E. Bellm, M. Bandstra, S. Boggs, W. Hajdas, D. M. Smith, and K. Hurley on behalf of the RHESSI team report:
As observed by RHESSI, GRB061007 (Schady et al., GCN 5707; Markwardt et al., GCN 5713) had a duration of ~73s starting at about T0=10:08:08 UT. The preliminary fit to the time-integrated RHESSI spectrum of the main period of emission from (T0+27s) - (T0+64s) between 34 keV and 6 MeV is a Band function with
```
alpha = -0.90 +0.27/-0.23
beta = -3.07 +0.40/-1.68
Epeak = 391 +58/-52 keV
(90% confidence levels).
```
The 20 keV-10 MeV fluence is 1.85 +0.12/-0.10 E-4 erg/cm^2.
GCN Report 7.1
GCN_Report 7.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_7_1.pdf by P.Schady titled: "Swift Observations of GRB 061007"
GCN Circular #5726
A.J. van der Horst (University of Amsterdam) and E. Rol (University of Leicester) report on behalf of a larger collaboration:
"We reobserved the position of the GRB 061007 afterglow at 4.8, 8.6 and 19 GHz with the Australia Telescope Compact Array at October 12 10.87 UT to 16.78 UT, i.e. 5.03 - 5.28 days after the burst (GCN 5707). We do not detect a radio source at the position of the optical afterglow (GCN 5706). The formal flux measurement for a point source at the location of the optical afterglow is -1 +/- 43 microJy at 4.8 GHz, -37 +/- 46 microJy at 8.6 GHz, and -1 +/- 47 microJy at 19 GHz.
We would like to thank the staff of the Australia Telescope National Facility, in particular Philip Edwards, for obtaining these Target of Opportunity observations."
astro-ph/0610660 from 21 Oct 2006
Mundell: The Remarkable Afterglow of GRB 061007: Implications for Optical Flashes and GRB Fireballs
We present a multiwavelength analysis of Swift GRB 061007. The 2-m robotic Faulkes Telescope South (FTS) began observing 137 s after the onset of the gamma-ray emission, when the optical counterpart was already decaying from R~10.3 mag, and continued observing for the next 5.5 hours. These observations begin during the final gamma-ray flare and continue through and beyond a long, soft tail of gamma-ray emission whose flux shows an underlying simple power law decay identical to that seen at optical and X-ray wavelengths, with temporal slope alpha~1.7. This remarkably simple decay in all of these bands is rare for Swift bursts, which often show much more complex light curves. We suggest the afterglow emission begins as early as 30-100 s and is contemporaneous with the on-going variable prompt emission from the central engine, but originates from a physically distinct region dominated by the forward shock. The afterglow continues unabated until at least ~10^5 seconds showing no evidence of a break. The observed multiwavelength evolution of GRB 061007 is explained by an expanding fireball whose optical, X-ray and late-time gamma-ray emission is dominated by emission from a forward shock with typical synchrotron frequency, nu_m, that is already below the optical band as early as t=137s and a cooling frequency, nu_c, above the X-ray band to at least t=10^5s. In contrast, the typical frequency of the reverse shock lies in the radio band at early time. We suggest that the unexpected lack of bright optical flashes from the majority of Swift GRBs may be explained with a low $\nu_m$ originating from small microphysics parameters, epsilon_e and epsilon_B. The minimum jet opening angle theta=5.7deg implies that GRB 061007 will be secure outlier to spectral energy correlations if no jet break has occurred before t=5x10^5 s.
astro-ph/0611081 from 3 Nov 2006
Schady: Extreme Properties Of GRB061007: A Highly Energetic Or A Highly Collimated Burst?
GRB061007 is the brightest gamma-ray burst (GRB) to be detected by Swift and is accompanied by an exceptionally luminous afterglow that had a V-band magnitude <11.1 at 80s after the prompt emission. From the start of the Swift observations the afterglow decayed as a power law with a slope of \alpha_X=1.66+/-0.01 in the X-ray and \alpha_{opt}=1.64+/-0.01 in the UV/optical, up to the point that it was no longer detected above background in the optical or X-ray bands. The brightness of this GRB and the similarity in the decay rate of the X-ray, optical and gamma-ray emission from 100s after the trigger distinguish this burst from others and present a challenge to the fireball model. The lack of a cooling or jet break in the afterglow up to \~10^5s constrains any model that can produce the large luminosity observed in GRB061007, which we found to require either an excessively large kinetic energy or highly collimated outflow. Analysis of the multi-wavelength spectral and high-resolution temporal data taken with Swift suggest an early time jet-break to be a more plausible scenario. This must have occurred within 80s of the prompt emission, which places an upper limit on the jet opening angle of \theta_j=0.8deg. Such a highly collimated outflow resolves the energy budget problem presented in a spherical emission model, reducing the isotropic equivalent energy of this burst to E_{\gamma}^{corr}=10^{50} ergs; consistent with other GRBs.
GCN Circular #5787
A.J. van der Horst, R.A.M.J. Wijers (University of Amsterdam) and E. Rol (University of Leicester) report:
"We reobserved the position of the GRB 061007 afterglow at 4.8 and 8.6 GHz with the Australia Telescope Compact Array at November 6 11.50 UT to 16.41 UT, i.e. 30.06 - 30.26 days after the burst (GCN 5707). We do not detect a radio source at the position of the optical afterglow (GCN 5706). The formal flux measurement for a point source at the location of the optical afterglow is -21 +/- 55 microJy at 4.8 GHz, and 9 +/- 57 microJy at 8.6 GHz.
We would like to thank the staff of the Australia Telescope National Facility, in particular Philip Edwards, for obtaining these Target of Opportunity observations."
0812.3737from 19 Dec 2008
Ohno: Time-evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics
Abstract: We perform a time-resolved spectral analysis of bright, long Gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Thanks to the large effective area of the WAM, we can investigate the time evolution of the spectral peak energy, Et_peak and the luminosity Lt_iso with 1-sec time resolution, and we find that luminosity Lt_iso with 1-sec time resolution, and we find that the time-resolved pulses also satisfy the Epeak-Liso relation, which was found for the time-averaged spectra of other bursts, suggesting the same physical conditions in each pulse. Furthermore, the initial rising phase of each pulse could be an outlier of this relation with higher Et_peak value by about factor 2. This difference could suggest that the fireball radius expands by a factor of 2-4 and/or bulk Lorentz factor of the fireball is decelerated by a factor of 4 during the initial phase, providing a new probe of the fireball dynamics in real time.
1102.4739 from 24 Feb 11
J. Larsson et al.: Spectral components in the bright, long GRB 061007: properties of the photosphere and the nature of the outflow
We present a time-resolved spectral analysis of the bright, long GRB 061007 (z=1.261) using Swift BAT and Suzaku WAM data. We find that the prompt emission of GRB 061007 can be equally well explained by a photospheric component together with a power law as by a Band function, and we explore the implications of the former model. The photospheric component, which we model with a multicolour blackbody, dominates the emission and has a very stable shape throughout the burst. This component provides a natural explanation for the hardness-intensity correlation seen within the burst and also allows us to estimate the bulk Lorentz factor and the radius of the photosphere. The power-law component dominates the fit at high energies and has a nearly constant slope of -1.5. We discuss the possibility that this component is of the same origin as the high-energy power laws recently observed in some Fermi LAT bursts.

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