Gamma-ray Burst 110106B

(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:     Thu 06 Jan 11 21:26:37 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     441676,   Seg_Num: 0
GRB_RA:          134.196d {+08h 56m 47s} (J2000),
                 134.384d {+08h 57m 32s} (current),
                 133.339d {+08h 53m 21s} (1950)
GRB_DEC:         +46.998d {+46d 59' 52"} (J2000),
                 +46.955d {+46d 57' 18"} (current),
                 +47.190d {+47d 11' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3384 [cnts]    Image_Peak=146 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   147     E_range: 25-100 keV
BKG_INTEN:       21148 [cnts]
BKG_TIME:        77161.46 SOD {21:26:01.46} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15567 TJD;     6 DOY;   11/01/06
GRB_TIME:        77177.01 SOD {21:26:17.01} UT
GRB_PHI:          41.08 [deg]
GRB_THETA:        34.02 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.80 [sigma]
IMAGE_SIGNIF:    7.63 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0 +84  +0 
SUN_POSTN:       287.58d {+19h 10m 19s}  -22.45d {-22d 27' 12"}
SUN_DIST:        147.37 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.45d {+21h 05m 48s}  -12.85d {-12d 51' 15"}
MOON_DIST:       145.86 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.91, 40.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.74, 28.46 [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 = 314.94,15.95 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:26:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     316041978
GRB_RA:          197.883d {+13h 11m 32s} (J2000),
                 198.013d {+13h 12m 03s} (current),
                 197.295d {+13h 09m 11s} (1950)
GRB_DEC:         +31.833d {+31d 49' 60"} (J2000),
                 +31.775d {+31d 46' 30"} (current),
                 +32.099d {+32d 05' 55"} (1950)
GRB_ERROR:       27.32 [deg radius, statistical plus systematic]
GRB_INTEN:       76 [cnts/sec]
DATA_SIGNIF:     5.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15567 TJD;     6 DOY;   11/01/06
GRB_TIME:        77176.08 SOD {21:26:16.08} UT
GRB_PHI:         122.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.80
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 0,1,0, 0,0,
SUN_POSTN:       287.58d {+19h 10m 19s}  -22.45d {-22d 27' 12"}
SUN_DIST:        101.25 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:      316.45d {+21h 05m 48s}  -12.85d {-12d 51' 16"}
MOON_DIST:       120.79 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:       81.24, 83.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      182.09, 35.99 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 156.38,23.87 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:26:55 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     316041978
GRB_RA:          166.220d {+11h 04m 53s} (J2000),
                 166.374d {+11h 05m 30s} (current),
                 165.518d {+11h 02m 04s} (1950)
GRB_DEC:         +42.220d {+42d 13' 12"} (J2000),
                 +42.160d {+42d 09' 38"} (current),
                 +42.490d {+42d 29' 24"} (1950)
GRB_ERROR:       12.93 [deg radius, statistical only]
DATA_SIGNIF:     7.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15567 TJD;     6 DOY;   11/01/06
GRB_TIME:        77176.08 SOD {21:26:16.08} UT
GRB_PHI:         139.00 [deg]
GRB_THETA:        82.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       287.58d {+19h 10m 19s}  -22.45d {-22d 27' 12"}
SUN_DIST:        127.68 [deg]   Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN:      316.45d {+21h 05m 49s}  -12.85d {-12d 51' 12"}
MOON_DIST:       140.87 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      171.20, 63.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      149.18, 33.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:30:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     441676,   Seg_Num: 0
GRB_RA:          134.196d {+08h 56m 47s} (J2000),
                 134.384d {+08h 57m 32s} (current),
                 133.339d {+08h 53m 21s} (1950)
GRB_DEC:         +46.998d {+46d 59' 52"} (J2000),
                 +46.955d {+46d 57' 18"} (current),
                 +47.190d {+47d 11' 25"} (1950)
GRB_DATE:        15567 TJD;     6 DOY;   11/01/06
GRB_TIME:        77177.01 SOD {21:26:17.01} UT
TRIGGER_INDEX:   147
GRB_PHI:          41.08 [deg]
GRB_THETA:        34.02 [deg]
DELTA_TIME:      45.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.80 [sigma]
IMAGE_SIGNIF:    7.63 [sigma]
LC_URL:          sw00441676000msb.lc
SUN_POSTN:       287.58d {+19h 10m 20s}  -22.45d {-22d 27' 11"}
SUN_DIST:        147.37 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.48d {+21h 05m 55s}  -12.84d {-12d 50' 37"}
MOON_DIST:       145.84 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.91, 40.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.74, 28.46 [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 = 314.94,15.95 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:31:55 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.181d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.987d {+46d 59' 12"} (J2000)
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77504.18 SOD {21:31:44.18} UT,   327.2 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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 06 Jan 11 21:34:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.181d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.987d {+46d 59' 14"} (J2000)
POINT_ROLL:      50.293d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77509.73 SOD {21:31:49.73} UT,   332.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.066
N_STARS:         36
X_OFFSET:        566 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1525 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00441676000msufc0332.fits
SUN_POSTN:       287.59d {+19h 10m 20s}  -22.45d {-22d 27' 09"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.52d {+21h 06m 04s}  -12.83d {-12d 49' 47"}
MOON_DIST:       145.84 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:35:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.181d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.987d {+46d 59' 14"} (J2000)
POINT_ROLL:      50.293d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77509.73 SOD {21:31:49.73} UT,   332.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.066
N_STARS:         36
X_OFFSET:        566 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1525 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00441676000msufc0332.fits
SUN_POSTN:       287.59d {+19h 10m 21s}  -22.45d {-22d 27' 09"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.52d {+21h 06m 05s}  -12.83d {-12d 49' 44"}
MOON_DIST:       145.84 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 06 Jan 11 21:35:45 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     441676,   Seg_Num: 0
GRB_RA:          134.1542d {+08h 56m 37.00s} (J2000),
                 134.3424d {+08h 57m 22.18s} (current),
                 133.2972d {+08h 53m 11.32s} (1950)
GRB_DEC:         +47.0027d {+47d 00' 09.7"} (J2000),
                 +46.9599d {+46d 57' 35.6"} (current),
                 +47.1951d {+47d 11' 42.5"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77521.00 SOD {21:32:01.00} UT,   344.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       287.59d {+19h 10m 21s}  -22.45d {-22d 27' 09"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.52d {+21h 06m 06s}  -12.83d {-12d 49' 37"}
MOON_DIST:       145.82 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.91, 40.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      122.70, 28.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:36:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.181d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.987d {+46d 59' 14"} (J2000)
ROLL:            50.293d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77509.73 SOD {21:31:49.73} UT,   332.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     316042316
X_OFFSET:        885 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1045
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00441676000msuni0339.fits
SUN_POSTN:       287.59d {+19h 10m 21s}  -22.45d {-22d 27' 09"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.53d {+21h 06m 07s}  -12.83d {-12d 49' 32"}
MOON_DIST:       145.83 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 06 Jan 11 21:36:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.181d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.987d {+46d 59' 14"} (J2000)
ROLL:            50.293d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77509.73 SOD {21:31:49.73} UT,   332.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     316042316
X_OFFSET:        885 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1045
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00441676000msuni0339.fits
SUN_POSTN:       287.59d {+19h 10m 21s}  -22.45d {-22d 27' 09"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.53d {+21h 06m 07s}  -12.83d {-12d 49' 30"}
MOON_DIST:       145.83 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 #11525
B. Sbarufatti (INAF-OAB/IASFPA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), C. Gronwall (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU/NASA/GSFC), E. Troja (NASA/GSFC/ORAU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 21:26:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110106B (trigger=441676). There was a 3.8 minute delayed slew. The BAT on-board calculated location is RA, Dec 134.196, +46.998 which is
```
   RA(J2000)  =  08h 56m 47s
   Dec(J2000) = +46d 59' 52"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks with a total duration of about 30 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 21:31:44.2 UT, 327.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 134.15458, 47.00194 which is equivalent to:
```
   RA(J2000)  = 08h 56m 37.10s
   Dec(J2000) = +47d 00' 07.0"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 102 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.37 x 10^20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 332 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:46:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.180d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.989d {+46d 59' 19"} (J2000)
POINT_ROLL:      50.290d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  78039.32 SOD {21:40:39.32} UT,   862.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.078
N_STARS:         66
X_OFFSET:        326 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1765 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00441676000msufc0862.fits
SUN_POSTN:       287.59d {+19h 10m 23s}  -22.45d {-22d 27' 06"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.61d {+21h 06m 27s}  -12.80d {-12d 47' 42"}
MOON_DIST:       145.80 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:46:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.180d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.989d {+46d 59' 19"} (J2000)
POINT_ROLL:      50.290d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  78039.32 SOD {21:40:39.32} UT,   862.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.078
N_STARS:         66
X_OFFSET:        326 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1765 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00441676000msufc0862.fits
SUN_POSTN:       287.59d {+19h 10m 23s}  -22.45d {-22d 27' 06"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.61d {+21h 06m 28s}  -12.79d {-12d 47' 38"}
MOON_DIST:       145.80 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 06 Jan 11 21:46:51 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     441676,   Seg_Num: 0
GRB_RA:          134.1545d {+08h 56m 37.08s} (J2000),
                 134.3427d {+08h 57m 22.25s} (current),
                 133.2975d {+08h 53m 11.39s} (1950)
GRB_DEC:         +47.0030d {+47d 00' 10.8"} (J2000),
                 +46.9602d {+46d 57' 36.7"} (current),
                 +47.1954d {+47d 11' 43.5"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  77521.00 SOD {21:32:01.00} UT,   344.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       287.59d {+19h 10m 23s}  -22.45d {-22d 27' 06"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.62d {+21h 06m 28s}  -12.79d {-12d 47' 37"}
MOON_DIST:       145.78 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.91, 40.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      122.70, 28.45 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 06 Jan 11 21:47:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.180d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.989d {+46d 59' 19"} (J2000)
ROLL:            50.290d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  78039.32 SOD {21:40:39.32} UT,   862.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     316042845
X_OFFSET:        885 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1045
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00441676000msuni0869.fits
SUN_POSTN:       287.60d {+19h 10m 23s}  -22.45d {-22d 27' 06"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.62d {+21h 06m 29s}  -12.79d {-12d 47' 29"}
MOON_DIST:       145.79 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 06 Jan 11 21:47:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     441676,   Seg_Num: 0
POINT_RA:        134.180d {+08h 56m 43s} (J2000)
POINT_DEC:       +46.989d {+46d 59' 19"} (J2000)
ROLL:            50.290d
IMG_START_DATE:  15567 TJD;     6 DOY;   11/01/06
IMG_START_TIME:  78039.32 SOD {21:40:39.32} UT,   862.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     316042845
X_OFFSET:        885 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1045
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00441676000msuni0869.fits
SUN_POSTN:       287.60d {+19h 10m 23s}  -22.45d {-22d 27' 05"}
SUN_DIST:        147.39 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:      316.62d {+21h 06m 30s}  -12.79d {-12d 47' 26"}
MOON_DIST:       145.79 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      172.93, 40.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.73, 28.44 [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 #11528
L.P. Xin, Z. X. Ling, Y.L. Qiu, J.Y. Wei, J. Wang, J.S. Deng, C. Wu, X. H. Han on behalf of EAFON report:
We began to observe GRB110106B ( Sbarufatti et al., GCN 11525 ) with Xinglong TNT telescope at 21:35:02.5(UT), 9min after the burst. A series of white and R-band images were obtained. No any new source was found within the errorbox of X-ray counterpart ( Sbarufatti et al., GCN 11525 ), down to 3 sigma upper limit of R~20 mag at the mean time of 14 min after the burst.
This message may be cited.
Thanks to the help of TNT observation assistant for this work.
For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/
GCN Circular #11532
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 2412 s of XRT Photon Counting mode data and 2 UVOT images for GRB 110106B, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 134.15423, +47.00272 which is equivalent to:
```
RA (J2000): 08h 56m 37.02s
Dec (J2000): +47d 00' 09.8"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11533
T. N. Ukwatta (GWU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), B. Sbarufatti (INAF-OAB/IASFPA), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110106B (trigger #441676) (Sbarufatti, et al., GCN Circ. 11525). The BAT ground-calculated position is RA, Dec = 134.155, 47.005 deg, which is
```
   RA(J2000)  =  08h 56m 37.3s 
   Dec(J2000) = +47d 00' 17.5" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted light curve shows 3 main overlapping peaks starting at ~T-6 sec and ending at ~T+23 sec. T90 (15-350 keV) is 24.8 +- 4.8 sec (estimated error including systematics).
The time-averaged spectrum from T-10.8 to T+23.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.76 +- 0.11. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.87 sec in the 15-150 keV band is 2.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/441676/BA/
GCN Circular #11534
A.J. Levan (U. Warwick), N.R. Tanvir, K. Wiersema (U. Leicester), L. Coccato (ESO) report for a larger collaboration:
We observed the location of GRB 110106B (Sbarufatti et al. GCN 11525) with the William Herschel Telescope and ACAM. Observations were obtained in the i-band, and began at 7 Jan, 00:41 UT, approximately 3 hours after the burst. Within the refined XRT localization (Beardmore et al. GCN 11532) we find a source at
```
RA(J2000) 08:56:37.02 
DEC(J2000) 47:00:09.8
```
with an uncertainty of ~0.5" in each axis.
The source appears to be extended, but may include a point source contribution on top of the extended emission. Photometry of the object suggests i~22.5. This is marginally brighter than the limit of SDSS observations of the region, and suggests some afterglow contribution to the observed flux at this time.
Further observations are encouraged."
GCN Circular #11537
C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), I.A. Steele, C.G. Mundell, S. Kobayashi (Liverpool JMU), A. Gomboc (U. Ljubljana) on behalf of a large collaboration report:
The 2-m Liverpool Telescope automatically began observing GRB 110106B (Sbarufatti et al. GCN Circ. 11525) on January 06, 21:35:46 UT, 9.5 minutes from the GRB trigger time with the SDSS filters riz. Within the enhanced XRT error circle (Beardmore et al. GCN Circ. 11532) we do not find any source down to the following limiting magnitudes.
```
Mid time from      Tot Exposure    Filter   Limiting Magnitude
trigger (s)           (s)
------------------------------------------------------------
2594                  720           z > 20.4
2300                  720           i > 21.4
2620                 1260           r > 22.5
------------------------------------------------------------
```
Calibration is against some nearby SDSS stars. The non-detection of the extended object mentioned by Levan et al. (GCN Circ. 11534) with i~22.5 is consistent with our limit.
GCN Circular #11538
R. Chornock, E. Berger (Harvard), and D. B. Fox (Penn. State) report on behalf of a larger collaboration:
We used GMOS on Gemini-North to observe the extended object present in the XRT error circle of GRB 110106B (Sbarufatti et al., GCN 11525; Beardmore et al. GCN 11532) discovered by Levan et al. (GCN 11534). We obtained 2x1500s of spectroscopy using the R400 grating to cover the spectral range 3900-8100 Angstroms, starting on January 7.38 UT. Emission lines from [O II], H-beta, and [O III] are present at a common redshift of z=0.618.
GCN Circular #11540
E. Berger (Harvard), A.J. Levan (U. Warwick), R. Chornock (Harvard), and N.R. Tanvir (U. Leicester) report:
"In addition to the spectroscopic observations reported in GCN #11538 we also obtained i-band imaging of the afterglow candidate of GRB 110106B found with the WHT (GCN #11534) with Gemini-N / GMOS. A total of 900 sec were obtained on source at a mean epoch of 2011 Jan 7.347 UT (10.89 hours after the burst and 7.64 hours after the WHT observation). Digital image subtraction of the Gemini and WHT observations reveals a fading source located at (J2000):
```
RA = 08:56:37.267
DEC = +47:00:10.49
```
with an uncertainty of about 0.2" in each coordinate. This position is about 1.5" due east of the galaxy noted in GCN #11534, whose redshift is 0.618 (GCN #11538). At this redshift the corresponding projected offset is about 10 kpc. We note that emission is still detected at the position of the afterglow, indicating that an association with an underlying host unrelated to the nearby galaxy may still be possible."
GCN Circular #11541
B. Sbarufatti (INAF-OAB/IASFPA) reports on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 110106B (Sbarufatti et al. GCN Circ. 11525), from 339 s to 30.3 ks after the BAT trigger. The data comprise 24 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 11532).
The light curve can be modelled with a series of power-law decays. The light curve initially rises, with an index alpha=-1.5 (+0.0, -1.3). At T+470 s it breaks to an alpha of 0.64 (+/-0.07) before breaking again at T+14354 s to a final decay with index alpha=1.6 (+1.0, -0.5).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.20 (+/-0.16). The best-fitting absorption column is 2.08 (+0.44, -0.22) x 10^21 cm^-2, in excess of the Galactic value of 2.4 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (6.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.08 (+0.44, -0.22) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^20 cm^-2
Excess significance: 15.4 sigma
Photon index:	     2.20 (+/-0.16)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00441676.
This circular is an official product of the Swift-XRT team.
GCN Circular #11543
P. N. Bhat (UAH) reports on behalf of the Fermi GBM Team:
"At 21:26:16.08 UT on 06 January 2011, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 110106B (trigger 316041978 / 110106893). which was also detected by the Swift/BAT (Sbarufatti et al. 2011, GCN 11525) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight was 103 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve consists of several pulses with a duration (T90) of about 35.5 s (50-300 keV). The time-averaged spectrum from T0-26.6 s to T0+25.6 s is adequately fit by a simple power law function with index -1.61 +/- 0.04 (C-stat 849 for 242 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (5.90 +/- 0.44)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+16.13 s in the 10-1000 keV band is 2.77 +/- 0.27 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11548
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB110106B (Sbarufatti et al., GCN Circ 11525) 23 sec s after notice time and 44 sec after GRB time at 2011-01-06 21:27:01.696 UT. On our first (10s exposure) set we haven`t found optical transient at Gemini position (Berger et al.,GCN Circ 11540). The upper limit on both telescopes has been about 16.0 mag The message may be cited. We have ~5 hours observations. The redaction are continueted.
mailto: lipunov@sai.msu.ru

GCN Circular #11552
J. Gorosabel, A.J. Castro-Tirado, M. Jelinek (IAA-CSIC, Granada), P. Kubanek (U. Valencia & IAA-CSIC, Granada), M. Visus, R. Tata (IAC, Obs. del Teide, Tenerife), A. Sota (OSN, Granada), S. Mottola, C. Faber (DLR, German Aerospace Center, Berlin), report on behalf of a larger collaboration:
"We have carried out VRIH-band observations of the GRB 110106B XRT error circle (Sbarufatti et al. GCN Circ. 11525) using the 0.6m BOOTES2, 1.23m CAHA, the 1.5m OSN, the 0.82m IAC80 and the 1.5m TCS telescopes, as follows:

  Telescope              Date Jan.2011    Post-GRB-time   Filter    Lim.Mag.
                                               (UT)                    (min)                         (3sigma)
 -------------------------------------------------------------------------------------------
  0.6m BOOTES2    6.90041-6.90212    10.3-12.8            R        16.5
  1.23m CAHA         6.90179-6.91123    12.3-25.9            R        20.4
  1.5m OSN              6.90258-6.91564    13.4-32.2             I         21.0
  1.23m CAHA         6.91184-6.96185    26.8-98.8            V        20.5
  IAC80                     6.91533-6.92520    31.8-46.0            R        20.3
  1.5m TCS              6.94378-6.96465   72.8-102.8           H        18.0
 --------------------------------------------------------------------------------------------

No optical object is detected coincident with the optical afterglow position (Levan et al. GCN Circ. 11534, Berger et al. GCN Circ. 11540) down to the limiting magnitudes (Vega system) displayed in the above table."

GCN Circular #11555
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB110106B (Sbarufatti et al., GCN Circ 11525) 23 sec s after notice time and 44 sec after GRB time at 2011-01-06 21:27:01.696 UT (Gorbovskoy et al., GCN Circ. 11548). On our first (10s exposure) set we haven`t found optical transient at Gemini position (Berger et al.,GCN Circ 11540). The upper limit on both telescopes has been about 16.0 mag. The composed images give next results:
```
Lim     Exp        Start time             Last image             Telescope

18.9.  14220  2011-01-06 21:54:34.262  2011-01-07 03:24:31.621     East

19.2.  13860  2011-01-06 21:57:51.527  2011-01-07 02:51:35.346     West
```
The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11599
Dale A. Frail (NRAO) report on behalf of a larger collaboration:
"We used the Expanded Very Large Array (EVLA) to observe the field of view towards GRB 110106b, detected by Swift and Fermi GBM (GCN 11525, 11532, 11533, 11543), on 2011 January 22.22 UT at a center frequency of 8.46 GHz. No radio afterglow is detected. At the position of the optical afterglow (GCN 11540) the flux density is measured to be -27 +/- 24 uJy.
No further observations are planned.

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Jochen Greiner, last update: 24-Jan-2011 [Disclaimer]