Gamma-ray Burst 120106A

(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:     Fri 06 Jan 12 14:16:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.129d {+04h 24m 31s} (J2000),
                  66.409d {+04h 25m 38s} (current),
                  64.970d {+04h 19m 53s} (1950)
GRB_DEC:         +64.028d {+64d 01' 42"} (J2000),
                 +64.055d {+64d 03' 19"} (current),
                 +63.913d {+63d 54' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4027 [cnts]    Image_Peak=211 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       22632 [cnts]
BKG_TIME:        51368.24 SOD {14:16:08.24} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15932 TJD;     6 DOY;   12/01/06
GRB_TIME:        51384.24 SOD {14:16:24.24} UT
GRB_PHI:          16.15 [deg]
GRB_THETA:        28.91 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.62 [sigma]
IMAGE_SIGNIF:    8.96 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +0 +64  +0 
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 06"}
SUN_DIST:        130.64 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.64d {+04h 50m 33s}  +22.59d {+22d 35' 07"}
MOON_DIST:        41.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.82, 10.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       76.26, 41.72 [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 = 82.59,13.92 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:18:15 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.1107d {+04h 24m 26.56s} (J2000),
                  66.3904d {+04h 25m 33.70s} (current),
                  64.9511d {+04h 19m 48.26s} (1950)
GRB_DEC:         +64.0372d {+64d 02' 13.9"} (J2000),
                 +64.0641d {+64d 03' 50.8"} (current),
                 +63.9219d {+63d 55' 18.7"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.88e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.18 [sigma]
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51459.09 SOD {14:17:39.09} UT,   74.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.22 261.55 243.71
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 06"}
SUN_DIST:        130.63 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.65d {+04h 50m 37s}  +22.59d {+22d 35' 08"}
MOON_DIST:        41.69 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.81, 10.19 [deg] galactic lon,lat of the burst
ECL_COORDS:       76.26, 41.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.71 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:18:27 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.1107d {+04h 24m 26.5s} (J2000),
                  66.3904d {+04h 25m 33.7s} (current),
                  64.9511d {+04h 19m 48.2s} (1950)
GRB_DEC:         +64.0372d {+64d 02' 13.9"} (J2000),
                 +64.0641d {+64d 03' 50.8"} (current),
                 +63.9219d {+63d 55' 18.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       67 [cnts]
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51459.09 SOD {14:17:39.09} UT,   74.8 [sec] since BAT Trigger Time
CENTROID_X:      266.25,  raw= 266  [pixels]
CENTROID_Y:      284.57,  raw= 285  [pixels]
ROLL:            307.35 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -31.63
GRB_POS_XRT_Z:   -88.27
IMAGE_URL:       sw00511235000msxps_rw.img
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 06"}
SUN_DIST:        130.63 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.66d {+04h 50m 37s}  +22.59d {+22d 35' 09"}
MOON_DIST:        41.69 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.81, 10.19 [deg] galactic lon,lat of the burst
ECL_COORDS:       76.26, 41.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:18:38 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.1107d {+04h 24m 26.5s} (J2000),
                  66.3904d {+04h 25m 33.7s} (current),
                  64.9511d {+04h 19m 48.2s} (1950)
GRB_DEC:         +64.0372d {+64d 02' 13.9"} (J2000),
                 +64.0641d {+64d 03' 50.8"} (current),
                 +63.9219d {+63d 55' 18.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       67 [cnts]
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51459.09 SOD {14:17:39.09} UT,   74.8 [sec] since BAT Trigger Time
CENTROID_X:      266.25,  raw= 266  [pixels]
CENTROID_Y:      284.57,  raw= 285  [pixels]
ROLL:            307.35 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -31.63
GRB_POS_XRT_Z:   -88.27
IMAGE_URL:       sw00511235000msxps_rw.img
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 06"}
SUN_DIST:        130.63 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.66d {+04h 50m 38s}  +22.59d {+22d 35' 09"}
MOON_DIST:        41.69 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.81, 10.19 [deg] galactic lon,lat of the burst
ECL_COORDS:       76.26, 41.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:20:15 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.129d {+04h 24m 31s} (J2000),
                  66.409d {+04h 25m 38s} (current),
                  64.970d {+04h 19m 53s} (1950)
GRB_DEC:         +64.028d {+64d 01' 42"} (J2000),
                 +64.055d {+64d 03' 19"} (current),
                 +63.913d {+63d 54' 47"} (1950)
GRB_DATE:        15932 TJD;     6 DOY;   12/01/06
GRB_TIME:        51384.24 SOD {14:16:24.24} UT
TRIGGER_INDEX:   146
GRB_PHI:          16.15 [deg]
GRB_THETA:        28.91 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.62 [sigma]
IMAGE_SIGNIF:    8.96 [sigma]
LC_URL:          sw00511235000msb.lc
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 05"}
SUN_DIST:        130.64 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.67d {+04h 50m 41s}  +22.59d {+22d 35' 10"}
MOON_DIST:        41.68 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.82, 10.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       76.26, 41.72 [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 = 82.59,13.92 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:20:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.143d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.015d {+64d 00' 55"} (J2000)
POINT_ROLL:      307.349d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51468.65 SOD {14:17:48.65} UT,   84.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.295
N_STARS:         53
X_OFFSET:        584 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    6
SL_URL:          sw00511235000msufc0084.fits
SUN_POSTN:       286.99d {+19h 07m 57s}  -22.52d {-22d 31' 05"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.68d {+04h 50m 43s}  +22.59d {+22d 35' 11"}
MOON_DIST:        41.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:22:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.143d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.015d {+64d 00' 55"} (J2000)
ROLL:            307.349d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51468.65 SOD {14:17:48.65} UT,   84.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347552276
X_OFFSET:        985 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0092.fits
SUN_POSTN:       286.99d {+19h 07m 58s}  -22.52d {-22d 31' 05"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.69d {+04h 50m 46s}  +22.59d {+22d 35' 12"}
MOON_DIST:        41.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [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:     Fri 06 Jan 12 14:22:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.143d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.015d {+64d 00' 55"} (J2000)
ROLL:            307.349d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51468.65 SOD {14:17:48.65} UT,   84.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347552276
X_OFFSET:        985 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0092.fits
SUN_POSTN:       286.99d {+19h 07m 58s}  -22.52d {-22d 31' 04"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.69d {+04h 50m 47s}  +22.59d {+22d 35' 12"}
MOON_DIST:        41.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [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 #12810
S. Immler (CRESST/GSFC/UMD), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), J. L. Racusin (NASA/GSFC), C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), R. L. C. Starling (U Leicester), T. N. Ukwatta (MSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
At 14:16:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120106A (trigger=511235). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 66.129, +64.028, which is
```
   RA(J2000)  =  04h 24m 31s
   Dec(J2000) = +64d 01' 42"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve show several overlapping peaks starting ~T-8 sec with a total duration of about 20 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 14:17:39.0 UT, 74.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 66.11105, 64.03810 which is equivalent to:
```
   RA(J2000)  = 04h 24m 26.65s
   Dec(J2000) = +64d 02' 17.2"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 46 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 in excess of the Galactic value (2.65 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 4.8 (+4.97/-3.87) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.88e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 84 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. Data from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 1.19.
Burst Advocate for this burst is S. Immler (stefan.immler AT nasa.gov). 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:     Fri 06 Jan 12 14:28:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
POINT_ROLL:      307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51680.81 SOD {14:21:20.81} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.589
N_STARS:         14
X_OFFSET:        665 [pixels]
Y_OFFSET:        538 [pixels]
X_MAX:           1624 [pixels]
Y_MAX:           1497 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00511235000msufc0296.fits
SUN_POSTN:       287.00d {+19h 07m 59s}  -22.52d {-22d 31' 03"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.75d {+04h 51m 00s}  +22.59d {+22d 35' 18"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:30:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
ROLL:            307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51680.81 SOD {14:21:20.81} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     347552488
X_OFFSET:        985 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0304.fits
SUN_POSTN:       287.00d {+19h 07m 59s}  -22.52d {-22d 31' 02"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.76d {+04h 51m 03s}  +22.59d {+22d 35' 19"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [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:     Fri 06 Jan 12 14:30:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
ROLL:            307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51680.81 SOD {14:21:20.81} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     347552488
X_OFFSET:        985 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0304.fits
SUN_POSTN:       287.00d {+19h 07m 59s}  -22.52d {-22d 31' 02"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.77d {+04h 51m 04s}  +22.59d {+22d 35' 19"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:35:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
POINT_ROLL:      307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  52261.24 SOD {14:31:01.24} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.277
N_STARS:         113
X_OFFSET:        425 [pixels]
Y_OFFSET:        298 [pixels]
X_MAX:           1864 [pixels]
Y_MAX:           1737 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00511235000msufc0876.fits
SUN_POSTN:       287.00d {+19h 08m 00s}  -22.52d {-22d 31' 01"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.81d {+04h 51m 14s}  +22.59d {+22d 35' 23"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jan 12 14:35:43 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     511235,   Seg_Num: 0
GRB_RA:           66.1072d {+04h 24m 25.72s} (J2000),
                  66.3869d {+04h 25m 32.86s} (current),
                  64.9476d {+04h 19m 47.42s} (1950)
GRB_DEC:         +64.0387d {+64d 02' 19.3"} (J2000),
                 +64.0656d {+64d 03' 56.3"} (current),
                 +63.9234d {+63d 55' 24.0"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  51516.00 SOD {14:18:36.00} UT,   131.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       287.00d {+19h 08m 00s}  -22.52d {-22d 31' 01"}
SUN_DIST:        130.62 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.82d {+04h 51m 16s}  +22.59d {+22d 35' 24"}
MOON_DIST:        41.69 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.81, 10.19 [deg] galactic lon,lat of the burst
ECL_COORDS:       76.25, 41.74 [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:     Fri 06 Jan 12 14:36:31 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
ROLL:            307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  52261.24 SOD {14:31:01.24} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347553068
X_OFFSET:        984 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0884.fits
SUN_POSTN:       287.00d {+19h 08m 00s}  -22.52d {-22d 31' 00"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.82d {+04h 51m 18s}  +22.59d {+22d 35' 24"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [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:     Fri 06 Jan 12 14:36:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511235,   Seg_Num: 0
POINT_RA:         66.140d {+04h 24m 34s} (J2000)
POINT_DEC:       +64.014d {+64d 00' 51"} (J2000)
ROLL:            307.344d
IMG_START_DATE:  15932 TJD;     6 DOY;   12/01/06
IMG_START_TIME:  52261.24 SOD {14:31:01.24} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347553068
X_OFFSET:        984 [pixels]
Y_OFFSET:        857 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1017
BINNING_INDEX:   1
IM_URL:          sw00511235000msuni0884.fits
SUN_POSTN:       287.00d {+19h 08m 00s}  -22.52d {-22d 31' 00"}
SUN_DIST:        130.65 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       72.83d {+04h 51m 18s}  +22.59d {+22d 35' 25"}
MOON_DIST:        41.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.84, 10.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       76.27, 41.71 [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 #12811
K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich, S. Shurpakov Moscow State University, Sternberg Astronomical Institute
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
MASTER II robotic double telescope (MASTER-Net: http://observ.pereplet.ru) located at Tunka (Baykal) was pointed to the 120106A (Immler et al., GCN Circ 12810) 19 s after notice time and 46 sec after GRB time at 14:16:24.24 UT.
On our first (10s exposure) west telescope image (| polasizations) we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 15.8 mag.
On our first (10s exposure) east telescope image (- polasizations) we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 15.9 mag.
The message may be cited.
GCN Circular #12812
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR), Boer M. (OCA-CNRS), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 120106A detected by SWIFT (trigger 511235) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 169 min. after the GRB trigger, just at the beginning of the night over Calern. The elevation of the field increased from 52 degrees above horizon and weather conditions were excellents.
We co-added a series of exposures. We did not found any optical counterpart in the error box of the XRT candidate (Immler et al. GCNC 12810):
```
Start    End       Rlim
169 min  212 min   19.3
```
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular #12813
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 3180 s of XRT Photon Counting mode data and 6 UVOT images for GRB 120106A, 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 = 66.10754, +64.03837 which is equivalent to:
```
RA (J2000): 04h 24m 25.81s
Dec (J2000): +64d 02' 18.1"
```
with an uncertainty of 1.4 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 #12814
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 120106A (Immler et al., GCNC 12810) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2012-01-06 14:17:12 UT (~48 sec after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 12813) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.00400    14:22:10     540.0   >19.3  >19.4  >18.7
0.04247    15:17:33    6420.0   >20.6  >20.2  >19.6
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #12815
S. D. Barthelmy (GSFC), T. Sakamoto (GSFC/UMBC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. Immler (CRESST/GSFC/UMD), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 120106A (trigger #511235) (Immler, et al., GCN Circ. 12810). The BAT ground-calculated position is RA, Dec = 66.129, 64.050 deg, which is
```
   RA(J2000)  =  04h 24m 30.9s 
   Dec(J2000) = +64d 03' 00.0" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.
The mask-weighted light curve shows the first peak starting at ~T-7 sec, peaking at ~T+1 sec, and ending at ~T+13 sec. There is a second, weaker peak starting at ~T+50 sec and ending at ~T+65 (possibly T+85) sec. T90 (15-350 keV) is 61.6 +- 4.1 sec (estimated error including systematics).
The time-averaged spectrum from T-6.24 to T+60.24 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.53 +- 0.17. The fluence in the 15-150 keV band is 9.7 +- 1.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.46 sec in the 15-150 keV band is 1.5 +- 0.2 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/511235/BA/
GCN Circular #12817
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), V. Mangano (INAF-IASFPA), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester) and S. Immler report on behalf of the Swift-XRT team:
We have analysed 12 ks of XRT data for GRB 120106A (Immler et al. GCN Circ. 12810), from 64 s to 29.5 ks after the BAT trigger. The data comprise 273 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 12813).
The light curve can be modelled with an initial power-law decay with an index of alpha=4.3 (+/-0.3), followed by a break at T+152 s to an alpha of 0.91 (+0.05, -0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.15 (+0.12, -0.15). The best-fitting absorption column is 7.6 (+6.8, -0.7) x 10^21 cm^-2, consistent with the Galactic value of 7.0 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (1.0 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.6 (+6.8, -0.7) x 10^21 cm^-2
Galactic foreground: 7.0 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.15 (+0.12, -0.15)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00511235.
This circular is an official product of the Swift-XRT team.
GCN Circular #12818
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich, S. Shurpakov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
MASTER II robotic double telescope (MASTER-Net: http://observ.pereplet.ru) located at Tunka (Baykal) was pointed to the 120106A (Immler et al., GCN Circ 12810) 19 s after notice time and 46 sec after GRB trigger time at 14:16:24.24 UT (Ivanov et al., GCN CIRC 12811).
On our first (10s exposure) set we haven`t found optical transient within preliminary SWIFT XRT error-box (Immler et al., GCN Circ 12810).
But we found marginally OT at East telescope (- polarizations) outside preliminary X-ray error box (Immler et al., GCN Circ 12810). The position of this OT is coincided with enhanced Swift-XRT position (Evans et al., GCN CIRC 12813).
```
      UT               T-T_GRB  Exp      mag      Tel    Filter

2012-01-06 14:17:10     46      10   17.0+-0.3   East    P-
2012-01-06 14:17:10     46      10     >16.8     West    P|
2012-01-06 14:22:23    359      70     >18.0     East    P-
2012-01-06 14:22:23    359      70     >18.0     West    P|
2012-01-06 14:26:45    720     120     >18.2     East    P-
2012-01-06 14:26:45    720     120     >18.2     West    P|
2012-01-06 14:31:49   1024     180     >18.3     East    P-
2012-01-06 14:31:49   1024     180     >18.4     West    P|
```
The images will be available at http://observ.pereplet.ru/images/GRB120106A/grb.html . The message may be cited.
GCN Circular #12819
Kenshi Yanagisawa, Daisuke Kuroda, Yasuhiro Shimizu, Kiichi Okita (OAO/NAOJ), Michitoshi Yoshida (Hiroshima-U), Kouji Ohta(Kyoto-U), and Nobuyuki Kawai(Tokyo Tech.) report on behalf of the MITSuME collaboration:
We observed the field of GRB120106A (Immler et al., GCNC 12810) in Ks-band with a wide-field NIR camera at Okayama Astrophysical Observatory (Japan). The camera has an effective aperture of 0.91m.
Observations started from 15:19 UT on 5th January, 1.05 hours after the BAT trigger, to 16:20 UT. The total exposure of 49 min was successfully obtained.
In our co-add image, we did not find any new point source within the enhanced XRT error circle (Evans et al., GCNC 12813) down to limiting magnitude of Ks= 15.6(Vega, S/N=3). The photometric calibration was made against 2MASS field stars.
```
T0+[min]    MID-UT     T-EXP[min]      Ks
---------------------------------------------------
  +93.6     15:50         49.0       >15.6 (S/N=3)
---------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]
```
GCN Circular #12820
U.Quadri, L.Strabla and R.Girelli report:We imaged the field of GRB 120106A detected by SWIFT(trigger 511235) with the robotic telescopeof (565)Bassano Bresciano Observatory, Italy.The observations started 223 min. after the GRB trigger,with our schmidt telescope (320/400/1000).Weather conditions were excellents.We co-added a series of 15 exposures. We did not found any optical counterpart in the error box of the XRTcandidate.
```
Start=C2=A0=C2=A0 End=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Vlim
223 min=C2=A0 25=2 min=C2=A0=C2=A0 19.5
```
Magnitudes were estimated with the UCAC-3 catalog.
GCN Circular #12821
S. Immler (CRESST/GSFC/UMD) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120106A 65 s after the BAT trigger (Immler et al., GCN Circ. 12810). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 12813) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for coadded exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white              687         6326          451   >20.3
v                   65         11570         619   >20.0
b                  551         6736          452   >20.8
u                  296         6531          924   >20.8
w1                 678         6326          452   >20.3
m2                 652         6121          454   >20.2
w2                 603         11220         1239   >21.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.195 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #12825

TITLE:   GCN CIRCULAR 
NUMBER:  12825 
SUBJECT: GRB 120106A: MITSuME Okayama Optical Observation (update)
DATE:    12/01/10 17:05:24 GMT 
FROM:    Daisuke Kuroda at OAO/NAOJ

We carried out a detailed analysis of GRB 120106A and found the optical afterglow in only Ic-band. This results indicated the possibility of a Rc-band dropout. Although we reported the three sigma upper limits in the previous circular (Kuroda et al., GCNC 12814), we updated our results as follows.
Three sigma upper limits and photometric result of the OT are listed below. We used GSC2.3 catalog for flux calibration.

T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic  Ic_err
-----------------------------------------------------------
0.00400    14:22:10     540.0    >19.3  >19.4  19.1  0.3
-----------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]

GCN Circular #12830
A. Volnova (SAI MSU), E. Litvinenko (UBAI), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the field of the Swift GRB 120106A (Beardmore et al., GCN 12810) with ORI-40 telescope of Kitab ISON observatory on Jan. 6 starting on (UT) 18:49:24. We obtained several unfiltered images between (UT) 18:49:24 - 19:20:20. On the stacked image we do not detect any source within the enhanced XRT error box (Evans et al., GCN 12813). The photometry is based on nearby reference stars of USNO-B1.0 (R2 magnitudes):
```
 Tstart UT, T0+,       Filter, Exposure, OT, UL (3 sigma)
                 (mid, d)             (s)

 18:49:24  0.2003    none  30*60       n/d  18.5
```

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Jochen Greiner, last update: 12-Jan-2012 [Disclaimer]