Gamma-ray Burst 071101

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 17:54:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     295779,   Seg_Num: 0
GRB_RA:           48.194d {+03h 12m 46s} (J2000),
                  48.356d {+03h 13m 26s} (current),
                  47.160d {+03h 08m 38s} (1950)
GRB_DEC:         +62.473d {+62d 28' 24"} (J2000),
                 +62.502d {+62d 30' 09"} (current),
                 +62.286d {+62d 17' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10097 [cnts]    Image_Peak=255 [image_cnts]
TRIGGER_DUR:     2.048 [sec]
TRIGGER_INDEX:   253     E_range: 15-50 keV
BKG_INTEN:       106863 [cnts]
BKG_TIME:        64389.66 SOD {17:53:09.66} UT
BKG_DUR:         24 [sec]
GRB_DATE:        14405 TJD;   305 DOY;   07/11/01
GRB_TIME:        64426.59 SOD {17:53:46.59} UT
GRB_PHI:         -126.21 [deg]
GRB_THETA:        12.73 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     9.27 [sigma]
IMAGE_SIGNIF:    6.51 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  +0  +0  +1 +65  +1
SUN_POSTN:       216.54d {+14h 26m 09s}  -14.47d {-14d 28' 20"}
SUN_DIST:        131.24 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.30d {+08h 41m 13s}  +20.85d {+20d 51' 17"}
MOON_DIST:        67.90 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       65.27, 42.58 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.
COMMENTS:        This trigger occurred at longitude,latitude = 164.71,8.33 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 17:57:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.181d {+03h 12m 43s} (J2000)
POINT_DEC:       +62.463d {+62d 27' 46"} (J2000)
POINT_ROLL:      15.046d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64508.50 SOD {17:55:08.50} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.750
N_STARS:         88
X_OFFSET:        569 [pixels]
Y_OFFSET:        516 [pixels]
X_MAX:           1528 [pixels]
Y_MAX:           1475 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00295779000msufc0081.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 22"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.33d {+08h 41m 20s}  +20.85d {+20d 50' 45"}
MOON_DIST:        67.93 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 17:57:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.181d {+03h 12m 43s} (J2000)
POINT_DEC:       +62.463d {+62d 27' 46"} (J2000)
POINT_ROLL:      15.046d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64508.50 SOD {17:55:08.50} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.750
N_STARS:         88
X_OFFSET:        569 [pixels]
Y_OFFSET:        516 [pixels]
X_MAX:           1528 [pixels]
Y_MAX:           1475 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00295779000msufc0081.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 23"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.34d {+08h 41m 21s}  +20.84d {+20d 50' 38"}
MOON_DIST:        67.93 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [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:     Thu 01 Nov 07 17:58:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.181d {+03h 12m 43s} (J2000)
POINT_DEC:       +62.463d {+62d 27' 46"} (J2000)
ROLL:            15.046d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64508.50 SOD {17:55:08.50} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     215632510
X_OFFSET:        888 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1048
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00295779000msuni0081.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 24"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.35d {+08h 41m 23s}  +20.84d {+20d 50' 28"}
MOON_DIST:        67.94 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 17:58:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.181d {+03h 12m 43s} (J2000)
POINT_DEC:       +62.463d {+62d 27' 46"} (J2000)
ROLL:            15.046d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64508.50 SOD {17:55:08.50} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     215632510
X_OFFSET:        888 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1048
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00295779000msuni0081.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 23"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.34d {+08h 41m 22s}  +20.84d {+20d 50' 31"}
MOON_DIST:        67.94 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [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:     Thu 01 Nov 07 17:58:43 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     295779,   Seg_Num: 0
GRB_RA:           48.194d {+03h 12m 46s} (J2000),
                  48.356d {+03h 13m 26s} (current),
                  47.160d {+03h 08m 38s} (1950)
GRB_DEC:         +62.473d {+62d 28' 24"} (J2000),
                 +62.502d {+62d 30' 09"} (current),
                 +62.286d {+62d 17' 09"} (1950)
GRB_DATE:        14405 TJD;   305 DOY;   07/11/01
GRB_TIME:        64426.59 SOD {17:53:46.59} UT
TRIGGER_INDEX:   253
GRB_PHI:         -126.21 [deg]
GRB_THETA:        12.73 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     9.27 [sigma]
IMAGE_SIGNIF:    6.51 [sigma]
LC_URL:          sw00295779000msb.lc
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 24"}
SUN_DIST:        131.25 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.35d {+08h 41m 23s}  +20.84d {+20d 50' 28"}
MOON_DIST:        67.93 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       65.27, 42.58 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 164.71,8.33 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 17:59:25 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.182d {+03h 12m 44s} (J2000)
POINT_DEC:       +62.460d {+62d 27' 37"} (J2000)
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64709.37 SOD {17:58:29.37} UT,   282.8 [sec] since BAT Trigger Time
COUNTS:          18    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:     Thu 01 Nov 07 18:00:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.182d {+03h 12m 44s} (J2000)
POINT_DEC:       +62.460d {+62d 27' 37"} (J2000)
POINT_ROLL:      15.048d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64614.63 SOD {17:56:54.63} UT,   188.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.543
N_STARS:         66
X_OFFSET:        569 [pixels]
Y_OFFSET:        516 [pixels]
X_MAX:           1528 [pixels]
Y_MAX:           1475 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00295779000msufc0188.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 25"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.36d {+08h 41m 26s}  +20.84d {+20d 50' 11"}
MOON_DIST:        67.95 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Nov 07 18:00:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.182d {+03h 12m 44s} (J2000)
POINT_DEC:       +62.460d {+62d 27' 37"} (J2000)
POINT_ROLL:      15.048d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64614.63 SOD {17:56:54.63} UT,   188.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.543
N_STARS:         66
X_OFFSET:        569 [pixels]
Y_OFFSET:        516 [pixels]
X_MAX:           1528 [pixels]
Y_MAX:           1475 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00295779000msufc0188.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 25"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.36d {+08h 41m 28s}  +20.83d {+20d 50' 05"}
MOON_DIST:        67.95 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [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:     Thu 01 Nov 07 18:01:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.182d {+03h 12m 44s} (J2000)
POINT_DEC:       +62.460d {+62d 27' 37"} (J2000)
ROLL:            15.048d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64614.63 SOD {17:56:54.63} UT,   188.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215632616
X_OFFSET:        888 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1048
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00295779000msuni0188.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 26"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.37d {+08h 41m 29s}  +20.83d {+20d 49' 58"}
MOON_DIST:        67.96 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [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:     Thu 01 Nov 07 18:01:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     295779,   Seg_Num: 0
POINT_RA:         48.182d {+03h 12m 44s} (J2000)
POINT_DEC:       +62.460d {+62d 27' 37"} (J2000)
ROLL:            15.048d
IMG_START_DATE:  14405 TJD;   305 DOY;   07/11/01
IMG_START_TIME:  64614.63 SOD {17:56:54.63} UT,   188.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     215632616
X_OFFSET:        888 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1048
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00295779000msuni0188.fits
SUN_POSTN:       216.54d {+14h 26m 10s}  -14.47d {-14d 28' 26"}
SUN_DIST:        131.26 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      130.37d {+08h 41m 30s}  +20.83d {+20d 49' 55"}
MOON_DIST:        67.96 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      138.47,  3.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       65.25, 42.57 [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 #7030
S. McBreen (MPE), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (NASA/UMBC), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team:
At 17:53:46 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071101 (trigger=295779). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 48.194, +62.473 which is
```
   RA(J2000)  =  03h 12m 46s
   Dec(J2000) = +62d 28' 24"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 3 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began taking data at 17:58:29 UT, 283 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. We are waiting for down-linked data to detect and determine a position for the source.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 82 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. 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 the large, but uncertain extinction expected.
Burst Advocate for this burst is S. McBreen (smcbreen AT mpe.mpg.de). 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 #7031
E. Ofek (Caltech) reports:
I note the presence of a 2MASS-cataloged galaxy, 2MASX J03124721+6231391, just outside the BAT localization region for the short-duration burst GRB 071101 (McBreen et al. 2007; GCN 7030). The galaxy is located 3.3 arcmin. from the nominal BAT localization. By analyzing all the Swift BAT and XRT observed GRB positions, I find that the probability that the BAT localization is off by more than 3.3 arcmin is about 3%. The galaxy J2000.0 position is: 03:12:47.2 +62:31:39, and it has a total K-band magnitude of 11.4.
This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
GCN Circular #7032
Martin Jel=EDnek, Petr Kub=E1nek, Stanislav V=EDtek,=20 Alberto J. Castro-Tirado (IAA-CSIC Granada) and=20 Lola Sabau-Graziati (INTA Madrid),=20 on behalf of the BOOTES collaboration,
report:
"The robotic telescope BOOTES-2 located at Experimental Station La Mayora (EELM-CSIC) in southern Spain followed automatically the Swift GRB 071101 (McBreen et al, GCN 7030). Images were taken starting 56s after the GRB (23.5s after the GCN notice).
We do not detect any new source within the BAT errorbox down to our unfiltered, USNO-A2 calibrated magnitude of 17.0 in out 180s exposure.
Note the high extinction in the line of sight E(B-V)=3D1.43697 =3D> (Ar=3D3.43).
In particular, we do not see any object at the position of the galaxy mentioned by Ofek (GCN 7031)."
GCN Circular #7033
I. Lee, M. Im (Seoul National University), and Y. Urata (Saitama U/ASIAA) on behalf of the EAFON team:
"Using the Mt. Lemmon (Arizona, US) 1.0m telescope operated by the Korea Astronomy and Space Science Institute, we have imaged the GRB071101 field (McBreen et al. GCN7030). The observation started at UT 01:59 on Nov 02 (8 hours after the GRB). These images obtained in B,V,R,I with 300 sec exposure show no new source. The upper limit derived from USNO-B1.0 stars is 21th mag in R-band."
This message may be cited.
We acknowledge the help of the LOAO operators, J.H. Yoon, for this observation.
GCN Circular #7034
C. Pagani (PSU) reports on behalf of the Swift-XRT team:
Swift XRT observed the GRB 071101 (trigger=295779, McBreen et al., GCN Circ. 7030) beginning 85 s after the BAT trigger. In the first 13 ks of Photon Counting mode data a faint X-ray source is detected at the position RA,Dec = 48.1772, +62.5002 deg, equivalent to:
```
RA(J2000) =  03h 12m 42.53s
Dec(J2000)= +62d 30' 00.7"
```
with an error of radius 7 arcseconds (90%, including boresight uncertainties). This is 102 arcseconds from the BAT position (GCN Circ. 7030) and 103 arcseconds from the 2MASS-cataloged galaxy, 2MASX J03124721+6231391 reported by Ofek (GCN Circ. 7031).
Further analysis will be reported in a subsequent circular.
GCN Circular #7035
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 071101 detected by SWIFT (trigger 295779) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 39.4s after the GRB trigger (7.1s after the notice). The elevation of the field increased from from 36 degrees above horizon and weather conditions were good. Images were acquired with no filter.
The date of trigger : t0 = 2007-11-01T17:53:46.752
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the XRT location defined by Pagani et al. GCN Circ. 7034) with a limiting magnitude of: t0+39.4s to t0+99.4s : R > 16.3
The second image is 30.0s exposure in tracking mode: t0+106.4s to t0+136.4s : R > 17.5
We co-added a series of exposures: t0+106.4s to t0+393.6s : R > 18.4
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=138.4726 lat= +3.9459 and the galactic extinction in R band is about 4.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #7036
X.F. Wang. L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang ,Y. Urata, and W.K. Zheng on behalf of EAFON report:
We have imaged the field of GRB071101(S. McBreen,GCN 7030) with TNT 0.8m telescope at Xinglong Observatory, started from 17:55:20 UT, 94s after the burst. A series of white band and R band images were obtained. After combined 20*20s white band images, we found two new faint sources within the error region of the BAT (S. McBreen, GCN 7030).
The coordinates were 03:12:21.115 +62:28:10.31 and 03:12:41.588 +62:28:01.9 ,respectively, with an uncertainty of 3 arsec. The two sources were both not seen in the USNO-B1.0 and USNO-A2.0, Horever ,the source 2 (03:12:41.588 +62:28:01.9) are consistent with a star in the 2MASS ALL-SKY catalog of point sources.
The white band magnitude of two sources were 20.27+-0.22 and 20.89+-0.36 ,respectively,derived from USNO-B1.0 R2 mag
At the mean time, no new sources was found in the error region of XRT (C. Pagani,GCN 7034).
We also clearly found the galaxy reported by E. Ofek (GCN 7031)
More detailed analysis are going!
This message may be cited.
GCN Circular #7037
M. Uemura, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team:
We performed optical-NIR observations of the field of GRB 071101 (GCN Circ. 7030) with TRISPEC attached to the "KANATA" 1.5-m telescope. Our images cover about 70% of the south region of the BAT errorbox, in which the nearby galaxy reported in GCN Circ. 7031 is not included and the region of the XRT error circle (GCN Circ. 7034) is included.
No fading source or afterglow candidate can significantly be detected in the XRT error circle. Upper limits of magnitude were estimated from neighbor USNO B1.0 stars and 2MASS sources, shown below:
```
time(UT)     time after the burst  lim. mag. exposure_time
1 Nov. 2007      (sec)                          (sec)

17:57:36          229              19.7(V)        30
17:57:33          226              17.0(J)        24
17:57:27          220              14.8(Ks)       12
18:16:25         1358              20.8(V)       123
18:16:24         1357              18.0(J)       120
18:16:16         1349              15.5(Ks)      108 
```
GCN Circular #7038
O. Godet, K.L. Page, A.P. Beardmore, J.P. Osborne (U. Leicester), S. McBreen (MPE) on behalf of the Swift-XRT team:
We analysed 15.5ks of Photon Counting data for GRB 071101 (McBreen et al. GCN Circ. 7030). Using Swift-XRT PC data, Pagani (GCN Circ. 7034) reported a faint X-ray source in the BAT error circle.
The X-ray light-curve for this source can be fitted by a power-law from T+85s to T+4.1e4s, with an initial decay index of 0.9 =B1 0.3. So, this source is the X-ray afterglow of GRB 071101.
The Photon Counting spectrum can modelled as an absorbed power-law, with Gamma =3D 2.9 +2.5/-1.7 and a total absorbing column of NH =3D (2.0 +2.8/-1.6)e22 cm-2. The Galactic value is 5.7e21 cm-2 in the direction of the burst. The 1-10 keV observed (unabsorbed) flux during this time is 1.4e-13(3.2e-13) erg cm-2 s-1.
Assuming the source continues to decay with the same decay index of 0.9, we predict an XRT count rate of 6.4e-4 counts/s at T+24 hours, which corresponds to an observed 1-10keV flux of 6.8E-14 ergs cm-2 s-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #7039
T. Ukwatta (GWU) S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), S. McBreen (MPE), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 071101 (trigger #295779) (McBreen, et al., GCN Circ. 7030). The BAT ground-calculated position is RA, Dec = 48.179, 62.524 deg, which is
```
   RA(J2000)  = 03h 12m 42.9s 
   Dec(J2000) = 62d 31' 27" 
```
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%.
The mask-weighted light curve shows a single peak starting at a low level at ~T-20, then spiking at T+1 sec, and ending at ~T+10 sec. T90 (15-350 keV) is 9.0 +- 1.0 sec (estimated error including systematics).
The time-averaged spectrum from T-1.9 to T+6.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.25 +- 0.58. The fluence in the 15-150 keV band is 7.6 +- 2.6 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T+0.07 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Report 101.1
GCN_Report 101.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_101_1.pdf by S. McBreen at MPE titled: "Swift Observations of GRB 071101"

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Jochen Greiner, last update: 08-Nov-2007 [Disclaimer]