Gamma-ray Burst 121212A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 06:56:37 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     541371,   Seg_Num: 0
GRB_RA:          177.841d {+11h 51m 22s} (J2000),
                 178.019d {+11h 52m 05s} (current),
                 177.142d {+11h 48m 34s} (1950)
GRB_DEC:         +78.034d {+78d 02' 04"} (J2000),
                 +77.962d {+77d 57' 45"} (current),
                 +78.313d {+78d 18' 45"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3846 [cnts]    Image_Peak=181 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       23896 [cnts]
BKG_TIME:        24958.02 SOD {06:55:58.02} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16273 TJD;   347 DOY;   12/12/12
GRB_TIME:        24973.38 SOD {06:56:13.38} UT
GRB_PHI:         -129.24 [deg]
GRB_THETA:        11.37 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.34 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +0 +35  +0 
SUN_POSTN:       259.83d {+17h 19m 20s}  -23.11d {-23d 06' 27"}
SUN_DIST:        110.89 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.72d {+16h 14m 53s}  -20.30d {-20d 17' 56"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.88, 38.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.60, 63.44 [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 = 298.72,15.93 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 06:57:33 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.773d {+11h 51m 05s} (J2000)
POINT_DEC:       +78.037d {+78d 02' 13"} (J2000)
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25041.75 SOD {06:57:21.75} UT,   68.4 [sec] since BAT Trigger Time
COUNTS:          6    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:     Wed 12 Dec 12 07:00:21 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     541371,   Seg_Num: 0
GRB_RA:          177.841d {+11h 51m 22s} (J2000),
                 178.019d {+11h 52m 05s} (current),
                 177.142d {+11h 48m 34s} (1950)
GRB_DEC:         +78.034d {+78d 02' 04"} (J2000),
                 +77.962d {+77d 57' 45"} (current),
                 +78.313d {+78d 18' 45"} (1950)
GRB_DATE:        16273 TJD;   347 DOY;   12/12/12
GRB_TIME:        24973.38 SOD {06:56:13.38} UT
TRIGGER_INDEX:   137
GRB_PHI:         -129.24 [deg]
GRB_THETA:        11.37 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.34 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
LC_URL:          sw00541371000msb.lc
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.89 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.76d {+16h 15m 03s}  -20.30d {-20d 18' 09"}
MOON_DIST:       105.01 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.88, 38.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.60, 63.44 [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 = 298.72,15.93 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:00:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.772d {+11h 51m 05s} (J2000)
POINT_DEC:       +78.037d {+78d 02' 12"} (J2000)
POINT_ROLL:      102.678d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25045.37 SOD {06:57:25.37} UT,   72.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.427
N_STARS:         23
X_OFFSET:        573 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1532 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00541371000msufc0071.fits
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.77d {+16h 15m 04s}  -20.30d {-20d 18' 09"}
MOON_DIST:       105.02 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:00:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.772d {+11h 51m 05s} (J2000)
POINT_DEC:       +78.037d {+78d 02' 12"} (J2000)
POINT_ROLL:      102.678d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25045.37 SOD {06:57:25.37} UT,   72.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.427
N_STARS:         23
X_OFFSET:        573 [pixels]
Y_OFFSET:        480 [pixels]
X_MAX:           1532 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00541371000msufc0071.fits
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.77d {+16h 15m 05s}  -20.30d {-20d 18' 10"}
MOON_DIST:       105.03 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:01:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.772d {+11h 51m 05s} (J2000)
POINT_DEC:       +78.037d {+78d 02' 12"} (J2000)
ROLL:            102.678d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25045.37 SOD {06:57:25.37} UT,   72.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376988255
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0081.fits
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.78d {+16h 15m 07s}  -20.30d {-20d 18' 14"}
MOON_DIST:       105.03 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:02:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.772d {+11h 51m 05s} (J2000)
POINT_DEC:       +78.037d {+78d 02' 12"} (J2000)
ROLL:            102.678d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25045.37 SOD {06:57:25.37} UT,   72.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376988255
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0081.fits
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.78d {+16h 15m 08s}  -20.30d {-20d 18' 14"}
MOON_DIST:       105.03 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:02:06 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     541371,   Seg_Num: 0
GRB_RA:          177.7825d {+11h 51m 07.79s} (J2000),
                 177.9610d {+11h 51m 50.63s} (current),
                 177.0825d {+11h 48m 19.80s} (1950)
GRB_DEC:         +78.0371d {+78d 02' 13.5"} (J2000),
                 +77.9651d {+77d 57' 54.2"} (current),
                 +78.3152d {+78d 18' 54.8"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25061.00 SOD {06:57:41.00} UT,   87.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       259.84d {+17h 19m 21s}  -23.11d {-23d 06' 28"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.78d {+16h 15m 08s}  -20.30d {-20d 18' 15"}
MOON_DIST:       105.03 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the burst
ECL_COORDS:      117.58, 63.43 [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 Circular #14064
D. Grupe (PSU), W. H. Baumgartner (GSFC/UMBC), C. Guidorzi (U Ferrara), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 06:56:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 121212A (trigger=541371). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 177.841, +78.034 which is
```
   RA(J2000) = 11h 51m 22s
   Dec(J2000) = +78d 02' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a FRED-like structure with a duration of about 20 sec. The peak count rate was ~2300 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 06:57:21.7 UT, 68.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 177.78252, 78.03720 which is equivalent to:
```
   RA(J2000)  = 11h 51m 07.80s
   Dec(J2000) = +78d 02' 13.9"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 45 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (3.67 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 4.2 (+2.54/-2.19) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 71 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 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6 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 expected extinction corresponding to E(B-V) of 0.07.
Burst Advocate for this burst is D. Grupe (dxg35 AT psu.edu). 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:     Wed 12 Dec 12 07:08:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.759d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.035d {+78d 02' 07"} (J2000)
POINT_ROLL:      102.665d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25258.44 SOD {07:00:58.44} UT,   285.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.452
N_STARS:         57
X_OFFSET:        333 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1772 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00541371000msufc0285.fits
SUN_POSTN:       259.84d {+17h 19m 22s}  -23.11d {-23d 06' 29"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.86d {+16h 15m 25s}  -20.31d {-20d 18' 36"}
MOON_DIST:       105.05 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:08:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.759d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.035d {+78d 02' 07"} (J2000)
POINT_ROLL:      102.665d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25258.44 SOD {07:00:58.44} UT,   285.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.452
N_STARS:         57
X_OFFSET:        333 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1772 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00541371000msufc0285.fits
SUN_POSTN:       259.84d {+17h 19m 22s}  -23.11d {-23d 06' 30"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.86d {+16h 15m 26s}  -20.31d {-20d 18' 38"}
MOON_DIST:       105.05 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:09:15 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     541371,   Seg_Num: 0
GRB_RA:          177.7906d {+11h 51m 09.74s} (J2000),
                 177.9690d {+11h 51m 52.56s} (current),
                 177.0908d {+11h 48m 21.79s} (1950)
GRB_DEC:         +78.0373d {+78d 02' 14.2"} (J2000),
                 +77.9653d {+77d 57' 54.9"} (current),
                 +78.3154d {+78d 18' 55.5"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25061.00 SOD {06:57:41.00} UT,   87.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       259.84d {+17h 19m 22s}  -23.11d {-23d 06' 30"}
SUN_DIST:        110.90 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.86d {+16h 15m 27s}  -20.31d {-20d 18' 39"}
MOON_DIST:       105.05 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.89, 38.62 [deg] galactic lon,lat of the burst
ECL_COORDS:      117.58, 63.43 [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:     Wed 12 Dec 12 07:09:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.759d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.035d {+78d 02' 07"} (J2000)
ROLL:            102.665d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25258.44 SOD {07:00:58.44} UT,   285.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     376988468
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0295.fits
SUN_POSTN:       259.84d {+17h 19m 22s}  -23.11d {-23d 06' 30"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.87d {+16h 15m 29s}  -20.31d {-20d 18' 41"}
MOON_DIST:       105.05 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:09:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.759d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.035d {+78d 02' 07"} (J2000)
ROLL:            102.665d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25258.44 SOD {07:00:58.44} UT,   285.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     376988468
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0295.fits
SUN_POSTN:       259.84d {+17h 19m 22s}  -23.11d {-23d 06' 30"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.87d {+16h 15m 29s}  -20.31d {-20d 18' 41"}
MOON_DIST:       105.06 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:15:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.760d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.036d {+78d 02' 08"} (J2000)
POINT_ROLL:      102.666d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25837.39 SOD {07:10:37.39} UT,   864.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.032
N_STARS:         62
X_OFFSET:        333 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1772 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00541371000msufc0864.fits
SUN_POSTN:       259.85d {+17h 19m 23s}  -23.11d {-23d 06' 31"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.93d {+16h 15m 44s}  -20.32d {-20d 19' 00"}
MOON_DIST:       105.07 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Dec 12 07:15:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.760d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.036d {+78d 02' 08"} (J2000)
POINT_ROLL:      102.666d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25837.39 SOD {07:10:37.39} UT,   864.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.032
N_STARS:         62
X_OFFSET:        333 [pixels]
Y_OFFSET:        240 [pixels]
X_MAX:           1772 [pixels]
Y_MAX:           1679 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00541371000msufc0864.fits
SUN_POSTN:       259.85d {+17h 19m 23s}  -23.11d {-23d 06' 31"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.94d {+16h 15m 45s}  -20.32d {-20d 19' 01"}
MOON_DIST:       105.07 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:17:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.760d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.036d {+78d 02' 08"} (J2000)
ROLL:            102.666d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25837.39 SOD {07:10:37.39} UT,   864.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376989047
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0874.fits
SUN_POSTN:       259.85d {+17h 19m 24s}  -23.11d {-23d 06' 31"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.96d {+16h 15m 50s}  -20.32d {-20d 19' 07"}
MOON_DIST:       105.08 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [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:     Wed 12 Dec 12 07:17:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     541371,   Seg_Num: 0
POINT_RA:        177.760d {+11h 51m 02s} (J2000)
POINT_DEC:       +78.036d {+78d 02' 08"} (J2000)
ROLL:            102.666d
IMG_START_DATE:  16273 TJD;   347 DOY;   12/12/12
IMG_START_TIME:  25837.39 SOD {07:10:37.39} UT,   864.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376989047
X_OFFSET:        892 [pixels]
Y_OFFSET:        799 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1052
Y_GRB_POS:       959
BINNING_INDEX:   1
IM_URL:          sw00541371000msuni0874.fits
SUN_POSTN:       259.85d {+17h 19m 24s}  -23.11d {-23d 06' 31"}
SUN_DIST:        110.91 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      243.96d {+16h 15m 51s}  -20.32d {-20d 19' 08"}
MOON_DIST:       105.08 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      126.90, 38.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      117.58, 63.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 12 Dec 12 09:43:47 UT 
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6721,   Sub_Num: 0
GRB_RA:         177.8216d {+11h 51m 17s} (J2000),
                177.9998d {+11h 52m 00s} (current),
                177.1226d {+11h 48m 29s} (1950)
GRB_DEC:        +78.0256d {+78d 01' 32"} (J2000),
                +77.9536d {+77d 57' 13"} (current), 
                +78.3038d {+78d 18' 14"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      7.89 [sigma]   
GRB_TIME:       24976.41 SOD {06:56:16.41} UT
GRB_DATE:       16273 TJD;   347 DOY;   12/12/12
SC_RA:          160.56 [deg] (J2000)
SC_DEC:          73.75 [deg] (J2000)
SUN_POSTN:      259.96d {+17h 19m 51s}  -23.12d {-23d 06' 57"}
SUN_DIST:       110.92 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:     245.60d {+16h 22m 23s}  -20.45d {-20d 26' 55"}
MOON_DIST:      105.49 [deg]
GAL_COORDS:     126.88, 38.64 [deg] galactic lon,lat of the burst  
ECL_COORDS:     117.61, 63.43 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.
COMMENTS:
COMMENTS:        NOTE: This INTEGRAL event is spatially(0.00<0.1deg) and temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=541371).
COMMENTS:       GRB 121212A

GCN Circular #14065
S.Mereghetti (IASF-Milano), C.Ferrigno, E.Bozzo, I.Vovk (ISDC, Versoix), D.Gotz (CEA, Saclay), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 10 s has been detected by IBAS in the IBIS/ISGRI data at 06:56:12 UT of December 12. Its refined coordinates (J2000) are:
```
R.A.= 177.8217  deg
DEC.=  78.0257  deg
```
with an uncertainty of 2 arcmin (90% c.l.).
The burst has a peak flux of 0,4 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 8e-8 erg/cm2.
This burst has also been detected by Swift (Grupe et al. GCN Circ.14064).
Due to the significance of the detection below the high confidence threshold, only an Alert Packet of WEAK type was distributed by IBAS in real time (Packet n. 6720).
A plot of the light curve has been posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #14066
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1934 s of XRT Photon Counting mode data and 2 UVOT images for GRB 121212A, 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 = 177.79152, +78.03739 which is equivalent to:
```
RA (J2000): 11h 51m 9.96s
Dec (J2000): +78d 02' 14.6"
```
with an uncertainty of 1.7 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 #14068
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), D. Grupe (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), 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-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 121212A (trigger #541371) (Grupe, et al., GCN Circ. 14064). The BAT ground-calculated position is RA, Dec = 177.787, 78.052 deg, which is
```
   RA(J2000)  =  11h 51m 08.8s 
   Dec(J2000) = +78d 03' 05.4" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a couple peaks starting at ~T-3 sec, peaking at ~T+0 sec, and ending at ~T+16 sec. T90 (15-350 keV) is 6.8 +- 1.3 sec (estimated error including systematics).
The time-averaged spectrum from T+0.02 to T+7.84 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.65 +- 0.40. The fluence in the 15-150 keV band is 1.2 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.02 sec in the 15-150 keV band is 0.7 +- 0.1 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/541371/BA/
GCN Circular #14069
N.P.M. Kuin (MSSL-UCL) and D. Grupe (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121212A 72 s after the BAT trigger (Grupe et al., GCN Circ. 14064). A source consistent with the enhanced XRT position (Beardmore et al. GCN Circ. 14066) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
   RA  (J2000) =  11:51:10.30 = 177.79292 (deg.)
   Dec (J2000) = +78:02:14.3  =  78.03730 (deg.)
```
with an estimated uncertainty of 0.62 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white               72         7133          824         21.23 +/- 0.17
v                  615         6108          352        >20.3
b                  540        13527         1160        >20.9
u                  285         1138          285         20.25 +/- 0.25
w1                 664        11960         1238        >20.8
m2                 639         6313          216        >20.5
w2                 763         5904          255        >20.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14070
D. A. Perley and A. Horesh (Caltech) report:
We slewed to the position of GRB121212A (rupe et al., GCN 14064) with the Keck I telescope (+LRIS) and acquired a series of exposures with the slit guider beginning at 15:40 UT, 8.7 hours after the event.
We identified a source near the DSS limit consistent with the XRT position, at coordinates (J2000) of:
```
RA  = 11:51:10.43
Dec = +78:02:15.3
(+/- 1.5 arcsec)
```
This is consistent with the XRT and UVOT positions (Beardmore et al., GCN 14066; Kuin et al., GCN 14069).
The magnitude is approximately R~21 on the guider camera at this time.
A series of 600s spectroscopic exposures were then taken during brightening morning twilight.
A provisional reduction of the (low S/N) spectrum shows a significant flux across the spectral range, extending to at least 3500 Angstroms with no break or strong absorption lines, suggesting z ~< 2 and consistent with the detection in the UVOT u filter. Analysis is ongoing.
GCN Circular #14071
L. Elenin (KIAM), A. Pozanenko (IKI), A. Volnova (SAI MSU, IKI), V. Savanevych (KNURE), A. Bryukhovetskiy (NSFCTC), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 121212A (Grupe et al., GCN 14064) with 0.45-m telescope of ISON-NM observatory starting on Dec. 12 (UT) 06:58:31, i.e 138 s after burst trigger. We took several unfiltered images of 30 s exposures. An automatic real-time pipeline did not detect any new object. However after stacking all images we marginally detected the source not visible in any filter of DSS2 in coordinates 11 51 10.40 +78 02 15.3 with uncertainty of 0.3 arcsec in both coordinates. The source is consistent with enhanced XRT afterglow position (Beardmore et al. GCN 14066) and optical transient (Kuin et al. GCN 14069; Perley and Horesh GCN 14070) . A preliminary photometry of co-added frames is based on the USNO-B1.0 (R2) nearby stars is following:
```
UT start,      Exposure,  OT,              UL (3 sigma)

06:58:31         30       n/d                 18.3
06:58:31       3x30       n/d                 18.7
06:58:31      10x30       n/d                 19.4
06:58:31      40x30       20.7 +/- 0.4        20.5
```
GCN Circular #14072
S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
We have imaged the field of the Swift (Grupe et al., GCN 14064) and Integral (Mereghetti et al., GCN 14065) GRB121212A with the robotic Palomar 60 inch telescope. Observations began at 08:06 UT on 12 December 2012 (~ 1.2 hours after the Swift trigger) and were obtained in the r', i', and z' filters.
At the location of the UVOT (Kuin et al., GCN 14069) and Keck/LRIS (Perley and Horesh, GCN 14070) afterglow, we identify a faint source in our r' and i' images. Using several nearby USNO-B1 point sources for reference, we measure a magnitude of R = 20.45 +/- 0.19 at this time.
GCN Circular #14073
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU) and D. Grupe report on behalf of the Swift-XRT team:
We have analysed 9.1 ks of XRT data for GRB 121212A (Grupe et al. GCN Circ. 14064), from 81 s to 19.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 14066).
The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.80 (+/-0.24).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.48 (+0.17, -0.16). The best-fitting absorption column is 2.2 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 3.7 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 3.1 x 10^-11 (6.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 3.7 x 10^20 cm^-2
Excess significance: 7.7 sigma
Photon index:	     2.48 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 0.80, the count rate at T+24 hours will be 0.011 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.3 x 10^-13 (6.6 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00541371.
This circular is an official product of the Swift-XRT team.
GCN Circular #14074
A. N. Morgan (UC Berkeley) reports:
We observed the field of GRB 121212A (Grupe et al., GCN 14064) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2012-Dec-12 09h50m10s UT, ~2.9 hours after the Swift trigger. In mosaics (effective exposure time of 1.96 h) taken simultaneously in the J, H, and Ks filters, we do not detect any source at the afterglow location (Kuin et al., GCN 14069; Perley and Horesh, GCN 14070; Elenin et al., GCN 14071; Cenko, GCN 14072).
```
post burst
t_mid (hr) exp.(hr) filt  U. Limit (3 sig).
4.79      1.96     J     > 19.0
4.79      1.96     H     > 17.9
4.79      1.96     Ks    > 17.1
```
All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.
GCN Circular #14076
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report:
The RAPTOR network of robotic optical telescopes made observations of Swift trigger 541371 (Grupe, et al., GCN 14064). The burst location was within the field of our wide-field monitor located near Los Alamos, NM USA, which began a 10 s exposure of the location at 06:56:03.18 UT, 10.2 s before the Swift trigger time and covering the initial few seconds of gamma-ray emission as detected by the BAT (Barthelmy, et al., GCN 14068). The next 10 s exposure begins at 06:56:23.58 UT, 10.2 s after the Swift trigger time and overlapping the end stages of the gamma-ray emission. We do not detect the optical counterpart detected by the UVOT (Kuin, et al., GCN 14069) and others. Our 3-sigma limiting magnitudes are R~10.1 based on comparison of our unfiltered images to the Tycho-2 V-band catalog.
Our narrow-field instruments began a series of 10 s exposures at 06:58:08.59 UT, 115 s after the Swift trigger. These images also do not show the optical counterpart to a limiting magnitude of R~16.4 based on comparison to the USNO-B1 R-band.
GCN Circular #14079
A. Pozanenko (IKI), A. Sergeev (Institute of Radio Astronomy of NASU),=20 A. Volnova (SAI MSU), O. Burhonov (UBAI), I. Molotov (KIAM) report on=20 behalf GRB follow-up collaboration:
We observed the field of Swift GRB 121212A (Grupe et al., GCN=20 14064) with AZT-22 telescope of Maidanak observatory starting on Dec. 12=20 (UT) 20:51:02 under mean seeing (FWHM) of about 1 arcsec. Totally we=20 obtained 6 images of 600 s exposure in R filter. At the position of the=20 OT of GRB 121212A (Kuin et al., GCN 14069; Perley and Horesh, GCN=20 14070; Elenin et al., GCN 14071) we marginally detected an extended=20 object. If it will be confirmed the object might be a host galaxy of GRB=20 121212A.
A preliminary photometry of the object:
```
T0+        Filter,  Exposure,   OT
(mid, d)            (s)

0.60088     R       6x600       23.0 =C2=B1 0.35
```
is based on USNO-B1.0 nearby stars:
```
USNO-B1.0 1680-0064718 11:51:09.04 +78:00:39.9 R2 =3D 16.34
USNO-B1.0 1680-0064713 11:51:05.10 +78:02:00.1 R2 =3D 19.35
```
GCN Circular #14082
S. Schulze (PUC, MCSS), D. Malesani (DARK/NBI), T. Pursimo, J. Jessen-Hansen (NOT) and P. Jakobsson (U Iceland) report on behalf a larger collaboration:
We observed the field of GRB 121212A, detected by Swift (Grupe et al., GCN 14064) and INTEGRAL (Mereghetti et al., GCN 14065), with ALFOSC mounted at the NOT. Observations started at 03:07:39 UT on 14 December, i.e. 1.8412 days after the trigger. We obtained a series of four R-band images with an individual exposure time of 300 s.
We detect an object inside the UVOT-refined XRT (http://www.swift.ac.uk/xrt_positions/00541371/) at
```
RA (J2000): 11:51:10.22
Dec (J2000): +78:02:14.51
```
We measured an R-band brightness of 23.5 +/- 0.1 mag with respect to four USNO B1.0 stars (R2 magnitude). We did not apply any correction for foreground extinction. Our measurement is consistent with Pozanenko et al. (GCN 14079) and confirms that the object first reported by Kuin et al. (GCN 14069) is the optical afterglow of GRB 121212A.
GCN Circular #14083
A. J. Castro-Tirado (IAA-CSIC Granada), M. Bremer and J.-M. Winters (IRAM Grenoble), on behalf of a larger collaboration, report:
"We conducted mm observations towards GRB 121212A (Grupe et al. GCNC 14064, Mereghetti et al. GCNC 14065) starting at 10.5 hr post burst with the PdBI at 90 GHz. At the position of the X-ray/optical afterglows (Beardmore et al. GCNC 14066, Kuin et al. GCNC 14069), no emission is detected down to 0.3 mJy (3 sigma limit)."
This message can be quoted.
GCN Circular #14085
M. Jang, M. Im (SNU), and Y. Urata (NCU), on behalf of EAFON
We observed GRB 121212A in IzY-bands starting at UT 08:51:52, 2012-12-12, ~ 2 hrs after the BAT trigger (Grupe et al, GCN 14064), using the 1.0m telescope at Mt.Lemmon in Arizona, U.S.
We do not detect the GRB afterglow in all bands at the position of the Swift/UVOT detection (Kuin et al. 14069). We estimate the 3-sigma limiting magnitude (AB system) of the afterglow for each band,
```
I > 20.0 (T0+7900s) 
z > 18.3 (T0+9370s) 
Y > 17.7 (T0+8260s),
```
by calibrating it against USNO-B1 stars with I2 magnitudes and 2MASS point sources without the galactic extinction correction.
We thank the LOAO operator, I. Baek, for performing the observation.
GCN Report 405.1
GCN_Report 405.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_405_1.pdf by D. Grupe at PSU titled: "Swift Observations of GRB 121212A"

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Jochen Greiner, last update: 14-Dec-2012 [Disclaimer]