Gamma-ray Burst 121211A

(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:     Tue 11 Dec 12 13:47:40 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.544d {+13h 02m 11s} (J2000),
                 195.699d {+13h 02m 48s} (current),
                 194.946d {+12h 59m 47s} (1950)
GRB_DEC:         +30.161d {+30d 09' 40"} (J2000),
                 +30.092d {+30d 05' 30"} (current),
                 +30.430d {+30d 25' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6095 [cnts]    Image_Peak=151 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   263     E_range: 25-100 keV
BKG_INTEN:       60969 [cnts]
BKG_TIME:        49590.02 SOD {13:46:30.02} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16272 TJD;   346 DOY;   12/12/11
GRB_TIME:        49622.79 SOD {13:47:02.79} UT
GRB_PHI:          87.27 [deg]
GRB_THETA:        33.42 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.45 [sigma]
IMAGE_SIGNIF:    7.59 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0 -15  +0 
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.05d {-23d 03' 17"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.33d {+15h 29m 19s}  -18.96d {-18d 57' 27"}
MOON_DIST:        60.41 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.88, 33.58 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 308.82,8.49 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=376926426).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:47:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     376926426
GRB_RA:          190.017d {+12h 40m 04s} (J2000),
                 190.169d {+12h 40m 41s} (current),
                 189.426d {+12h 37m 42s} (1950)
GRB_DEC:         +46.700d {+46d 42' 00"} (J2000),
                 +46.629d {+46d 37' 45"} (current),
                 +46.974d {+46d 58' 28"} (1950)
GRB_ERROR:       15.72 [deg radius, statistical plus systematic]
GRB_INTEN:       109 [cnts/sec]
DATA_SIGNIF:     7.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16272 TJD;   346 DOY;   12/12/11
GRB_TIME:        49623.59 SOD {13:47:03.59} UT
GRB_PHI:         310.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.13
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.05d {-23d 03' 17"}
SUN_DIST:         93.27 [deg]   Sun_angle= 4.6 [hr] (West of Sun)
MOON_POSTN:      232.33d {+15h 29m 19s}  -18.96d {-18d 57' 26"}
MOON_DIST:        75.80 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      128.72, 70.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      165.07, 45.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 185.78,25.25 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:47:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     376926426
GRB_RA:          208.510d {+13h 54m 02s} (J2000),
                 208.651d {+13h 54m 36s} (current),
                 207.964d {+13h 51m 51s} (1950)
GRB_DEC:         +35.620d {+35d 37' 12"} (J2000),
                 +35.557d {+35d 33' 24"} (current),
                 +35.865d {+35d 51' 55"} (1950)
GRB_ERROR:       11.48 [deg radius, statistical only]
DATA_SIGNIF:     7.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16272 TJD;   346 DOY;   12/12/11
GRB_TIME:        49623.59 SOD {13:47:03.59} UT
GRB_PHI:         322.00 [deg]
GRB_THETA:        60.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.05d {-23d 03' 17"}
SUN_DIST:         75.55 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      232.33d {+15h 29m 20s}  -18.96d {-18d 57' 27"}
MOON_DIST:        58.96 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       69.29, 74.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      189.87, 43.53 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=541200).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:49:10 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.5332d {+13h 02m 07.96s} (J2000),
                 195.6878d {+13h 02m 45.07s} (current),
                 194.9354d {+12h 59m 44.49s} (1950)
GRB_DEC:         +30.1489d {+30d 08' 56.0"} (J2000),
                 +30.0795d {+30d 04' 46.1"} (current),
                 +30.4175d {+30d 25' 03.0"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.64e-09 [erg/cm2/sec]
GRB_SIGNIF:      12.56 [sigma]
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49712.31 SOD {13:48:32.31} UT,   89.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.22 261.52 243.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.05d {-23d 03' 17"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.35d {+15h 29m 23s}  -18.96d {-18d 57' 36"}
MOON_DIST:        60.42 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.18 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.87, 33.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.92 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:49:18 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.5332d {+13h 02m 07.9s} (J2000),
                 195.6878d {+13h 02m 45.0s} (current),
                 194.9354d {+12h 59m 44.4s} (1950)
GRB_DEC:         +30.1489d {+30d 08' 56.0"} (J2000),
                 +30.0795d {+30d 04' 46.1"} (current),
                 +30.4175d {+30d 25' 03.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       158 [cnts]
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49712.31 SOD {13:48:32.31} UT,   89.5 [sec] since BAT Trigger Time
CENTROID_X:      344.00,  raw= 344  [pixels]
CENTROID_Y:      273.25,  raw= 273  [pixels]
ROLL:            123.50 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -58.32
GRB_POS_XRT_Z:   95.00
IMAGE_URL:       sw00541200000msxps_rw.img
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.06d {-23d 03' 17"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.35d {+15h 29m 24s}  -18.96d {-18d 57' 36"}
MOON_DIST:        60.42 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.18 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.87, 33.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:49:27 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.5332d {+13h 02m 07.9s} (J2000),
                 195.6878d {+13h 02m 45.0s} (current),
                 194.9354d {+12h 59m 44.4s} (1950)
GRB_DEC:         +30.1489d {+30d 08' 56.0"} (J2000),
                 +30.0795d {+30d 04' 46.1"} (current),
                 +30.4175d {+30d 25' 03.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       158 [cnts]
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49712.31 SOD {13:48:32.31} UT,   89.5 [sec] since BAT Trigger Time
CENTROID_X:      344.00,  raw= 344  [pixels]
CENTROID_Y:      273.25,  raw= 273  [pixels]
ROLL:            123.50 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -58.32
GRB_POS_XRT_Z:   95.00
IMAGE_URL:       sw00541200000msxps_rw.img
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.06d {-23d 03' 17"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.35d {+15h 29m 24s}  -18.96d {-18d 57' 37"}
MOON_DIST:        60.42 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.18 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.87, 33.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:50:49 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.544d {+13h 02m 11s} (J2000),
                 195.699d {+13h 02m 48s} (current),
                 194.946d {+12h 59m 47s} (1950)
GRB_DEC:         +30.161d {+30d 09' 40"} (J2000),
                 +30.092d {+30d 05' 30"} (current),
                 +30.430d {+30d 25' 47"} (1950)
GRB_DATE:        16272 TJD;   346 DOY;   12/12/11
GRB_TIME:        49622.79 SOD {13:47:02.79} UT
TRIGGER_INDEX:   263
GRB_PHI:          87.27 [deg]
GRB_THETA:        33.42 [deg]
DELTA_TIME:      -75.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.45 [sigma]
IMAGE_SIGNIF:    7.59 [sigma]
LC_URL:          sw00541200000msb.lc
SUN_POSTN:       259.05d {+17h 16m 11s}  -23.06d {-23d 03' 17"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.37d {+15h 29m 28s}  -18.96d {-18d 57' 45"}
MOON_DIST:        60.43 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.88, 33.58 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 308.82,8.49 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:52:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.569d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.148d {+30d 08' 53"} (J2000)
POINT_ROLL:      123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49719.77 SOD {13:48:39.77} UT,   97.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.963
N_STARS:         12
X_OFFSET:        312 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00541200000msufc0096.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.38d {+15h 29m 31s}  -18.96d {-18d 57' 53"}
MOON_DIST:        60.42 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.35, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:52:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.569d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.148d {+30d 08' 53"} (J2000)
POINT_ROLL:      123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49719.77 SOD {13:48:39.77} UT,   97.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.963
N_STARS:         12
X_OFFSET:        312 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00541200000msufc0096.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.38d {+15h 29m 32s}  -18.97d {-18d 57' 56"}
MOON_DIST:        60.42 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.35, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [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:     Tue 11 Dec 12 13:54:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.569d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.148d {+30d 08' 53"} (J2000)
ROLL:            123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49719.77 SOD {13:48:39.77} UT,   97.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376926529
X_OFFSET:        673 [pixels]
Y_OFFSET:        1074 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1234
BINNING_INDEX:   1
IM_URL:          sw00541200000msuni0106.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.40d {+15h 29m 36s}  -18.97d {-18d 58' 05"}
MOON_DIST:        60.43 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.35, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [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:     Tue 11 Dec 12 13:54:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.569d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.148d {+30d 08' 53"} (J2000)
ROLL:            123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49719.77 SOD {13:48:39.77} UT,   97.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     376926529
X_OFFSET:        673 [pixels]
Y_OFFSET:        1074 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1234
BINNING_INDEX:   1
IM_URL:          sw00541200000msuni0106.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.41d {+15h 29m 37s}  -18.97d {-18d 58' 07"}
MOON_DIST:        60.44 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.35, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:54:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.571d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.147d {+30d 08' 48"} (J2000)
POINT_ROLL:      123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49877.72 SOD {13:51:17.72} UT,   254.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.340
N_STARS:         9
X_OFFSET:        353 [pixels]
Y_OFFSET:        754 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1713 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00541200000msufc0254.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.72 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.41d {+15h 29m 38s}  -18.97d {-18d 58' 09"}
MOON_DIST:        60.44 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.32, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:54:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.571d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.147d {+30d 08' 48"} (J2000)
POINT_ROLL:      123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49877.72 SOD {13:51:17.72} UT,   254.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.340
N_STARS:         9
X_OFFSET:        353 [pixels]
Y_OFFSET:        754 [pixels]
X_MAX:           1312 [pixels]
Y_MAX:           1713 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00541200000msufc0254.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.72 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.41d {+15h 29m 38s}  -18.97d {-18d 58' 08"}
MOON_DIST:        60.44 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.32, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Dec 12 13:55:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.571d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.147d {+30d 08' 48"} (J2000)
ROLL:            123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49877.72 SOD {13:51:17.72} UT,   254.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     376926687
X_OFFSET:        673 [pixels]
Y_OFFSET:        1074 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1234
BINNING_INDEX:   1
IM_URL:          sw00541200000msuni0264.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.42d {+15h 29m 41s}  -18.97d {-18d 58' 15"}
MOON_DIST:        60.45 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.32, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [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:     Tue 11 Dec 12 13:56:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     541200,   Seg_Num: 0
POINT_RA:        195.571d {+13h 02m 17s} (J2000)
POINT_DEC:       +30.147d {+30d 08' 48"} (J2000)
ROLL:            123.502d
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49877.72 SOD {13:51:17.72} UT,   254.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     376926687
X_OFFSET:        673 [pixels]
Y_OFFSET:        1074 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       833
Y_GRB_POS:       1234
BINNING_INDEX:   1
IM_URL:          sw00541200000msuni0264.fits
SUN_POSTN:       259.05d {+17h 16m 12s}  -23.06d {-23d 03' 18"}
SUN_DIST:         80.73 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.42d {+15h 29m 42s}  -18.97d {-18d 58' 17"}
MOON_DIST:        60.45 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.32, 86.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.91, 33.58 [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:     Tue 11 Dec 12 13:57:16 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     541200,   Seg_Num: 0
GRB_RA:          195.5333d {+13h 02m 07.99s} (J2000),
                 195.6879d {+13h 02m 45.09s} (current),
                 194.9355d {+12h 59m 44.51s} (1950)
GRB_DEC:         +30.1485d {+30d 08' 54.5"} (J2000),
                 +30.0791d {+30d 04' 44.7"} (current),
                 +30.4171d {+30d 25' 01.6"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         18.48 +/- 0.40 [mag]
FILTER:          10, White
IMG_START_DATE:  16272 TJD;   346 DOY;   12/12/11
IMG_START_TIME:  49719.00 SOD {13:48:39.00} UT,   96.2 [sec] since BAT Trigger Time
SUN_POSTN:       259.05d {+17h 16m 13s}  -23.06d {-23d 03' 19"}
SUN_DIST:         80.75 [deg]   Sun_angle= 4.2 [hr] (West of Sun)
MOON_POSTN:      232.44d {+15h 29m 45s}  -18.97d {-18d 58' 23"}
MOON_DIST:        60.48 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:       85.72, 86.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.87, 33.57 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 1.1 arcsec from the XRT position.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14057
V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), M. M. Chester (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (STScI), J. A. Kennea (PSU), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), E. Sonbas (NASA/GSFC/Adiyaman Univ.), R. L. C. Starling (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team:
At 13:47:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 121211A (trigger=541200). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 195.544, +30.161 which is
```
   RA(J2000)  =  13h 02m 11s
   Dec(J2000) = +30d 09' 40"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a total duration of about 180 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 13:48:32.3 UT, 89.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 195.5332, 30.1489 which is equivalent to:
```
   RA(J2000)  = +13h 02m 7.97s
   Dec(J2000) = +30d 08' 56.0"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 55 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 96 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at
```
  RA(J2000)  =	13:02:08.01 = 195.53339
  DEC(J2000) = +30:08:54.9  =  30.14858
```
with a 90%-confidence error radius of about 1.10 arc sec. This position is 1.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.49. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is V. Mangano (vanessa AT ifc.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 Circular #14058
J. Japelj, D. Kopa=C4=8D (U. Ljubljana), C. Guidorzi (U. Ferrara), C. Mundell, F. Virgili (Liverpool JMU) report on behalf of a large collaboration:
The 2-m Faulkes Telescope North automatically began observing GRB 121211A (Mangano et al. GCN Circ. 14057) on Dec 11 2012, 13:50:46 UT corresponding to 224 seconds post burst trigger. We confirm the presence of a fading source at the optical afterglow candidate position reported by Mangano et al. GCN Circ. 14057. In the first 3x10 s exposure, we measure a preliminary R magnitude of 17.9 +- 0.3, calibrated against nearby USNO-B1 stars.
GCN Circular #14059
D. A. Perley (Caltech), J. X. Prochaska (UCO/Lick), and A. N. Morgan (UC Berkeley) report:
We slewed with the Keck I telescope (+LRIS) to the location of GRB 121211A (Mangano et al., GCN 14057) immediately following the GCN notice. The optical transient (Mangano et al.; Japelj et al., GCN 14058) was identified on the guider camera and longslit exposures began at 14:01 UT, 14 minutes after the GRB trigger. After a single short observation in low resolution we acquired 2x860s exposures on the blue and red side. The spectral range extends from 3150-5630 and 5790-7440 Angstroms.
We identify FeII (2344, 2374, 2382, 2586, 2600) and possible FeII* and MnII at a redshift of z=1.023, as well as a marginal detection of MgII (2796, 2804) at the same redshift using the short initial exposure, which covers the dichroic gap. We suggest this as the redshift of GRB 121211A.
GCN Circular #14060
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2289 s of XRT Photon Counting mode data and 6 UVOT images for GRB 121211A, 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 = 195.53315, +30.14869 which is equivalent to:
```
RA (J2000): 13h 02m 7.96s
Dec (J2000): +30d 08' 55.3"
```
with an uncertainty of 1.6 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 #14061
D.N. Burrows (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), M.C. Stroh (PSU) and V. Mangano report on behalf of the Swift-XRT team:
We have analysed 12 ks of XRT data for GRB 121211A (Mangano et al. GCN Circ. 14057), from 95 s to 29.5 ks after the BAT trigger. The data comprise 203 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 14060).
The late-time light curve (from T0+3.9 ks) can be modelled with a power-law decay with a decay index of alpha=0.77 (+/-0.07).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.15 (+/-0.04). The best-fitting absorption column is 2.85 (+/-0.13) x 10^21 cm^-2, in excess of the Galactic value of 9.5 x 10^19 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.11 (+0.15, -0.14) and a best-fitting absorption column of 1.4 (+0.4, -0.3) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.4 (+0.4, -0.3) x 10^21 cm^-2
Galactic foreground: 9.5 x 10^19 cm^-2
Excess significance: 6.4 sigma
Photon index:	     2.11 (+0.15, -0.14)
```
If the light curve continues to decay with a power-law decay index of 0.76, the count rate at T+24 hours will be 0.025 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.9 x 10^-13 (1.3 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00541200.
This circular is an official product of the Swift-XRT team.
GCN Circular #14062
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 121211A (Mangano et al., GCNC 14057) 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 2012-12-11 16:29:09 UT (~2.7 h after the burst). We detected the previously reported afterglow (Japelj et al., GCNC 14058) in all the three bands.
Photometric results and three sigma upper limit of the OT are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'   g'_err Rc    Rc_err Ic    Ic_err
-----------------------------------------------------------------------
0.15443    17:29:25    6360.0   >20.5         20.4  0.2    19.6  0.3
0.23818    19:30:01    6360.0    20.9  0.3    21.1  0.3    20.1  0.3
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14063
M. M. Chester (PSU) and V. Mangano (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121211A 97 s after the BAT trigger (Mangano et al., GCN Circ. 14057). A source consistent with the enhanced Swift-XRT position (Osborne et al. GCN Circ. 14060) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
   RA  (J2000) =  13:02:07.99 = 195.53328 (deg.)
   Dec (J2000) = +30:08:54.6  =  30.14849 (deg.)
```
with an estimated uncertainty of 0.52 arc sec. (radius, 90% confidence).
The following table provides preliminary detections and 3-sigma upper limits for the finding charts and summed exposures using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373). The lack of a detection in uvw2 is consistent with the redshift of 1.023 reported by Perley et al. (GCN Circ. 14059).
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white_FC            97          247          147         18.4 +/- 0.1
white             4103         5738          393         19.9 +/- 0.1
v                 4514         6148          393        >19.9
b                 3899         5533          393         20.4 +/- 0.2
u_FC               255          297           41         18.3 +/- 0.3
u                 5128         5328          197         19.6 +/- 0.2
w1               10576        11476          886         20.6 +/- 0.2
m2                4718        10569         1082         20.6 +/- 0.2
w2                4309         5943          393        >21.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14067
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), V. Mangano (INAF-IASFPA), 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-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 121211A (trigger #541200) (Mongano, et al., GCN Circ. 14057). The BAT ground-calculated position is RA, Dec = 195.575, 30.173 deg, which is
```
   RA(J2000)  =  13h 02m 18.0s 
   Dec(J2000) = +30d 10' 24.4" 
```
with an uncertainty of 4.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 23%.
The mask-weighted light curve shows a peak starting at ~T-5 sec, peaking at ~T+2 sec, and returning to baseline at ~T+5 sec. Then a second set of peaks starts at ~T+20 with the main emission from T+105 to ~T+200 sec. T90 (15-350 keV) is 182 +- 39 sec (estimated error including systematics).
The time-averaged spectrum from T-0.48 to T+196.77 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.36 +- 0.26. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.07 sec in the 15-150 keV band is 1.0 +- 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/541200/BA/
GCN Circular #14075
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 541200 (Mangano, et al., GCN 14057). The burst location was within the field of our wide-field monitor located in Maui, HI, which began a 10 s integration of the location at 03:47:00.17 UT, 2.8 s before the Swift trigger time and during the gamma-ray emitting interval. During the period that the BAT was detecting gamma-ray emission, from ~T-5 s to ~T+200 s (Barthelmy, et al., GCN 14067), we have a total of twenty 10 s exposures with limiting magnitudes of R~9.8. We do not detect the optical counterpart in any of our images. Our 3-sigma limiting magnitudes are based on a comparison of our unfiltered image to the Tycho-2 V-band catalog.
GCN Circular #14077
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez=E2=80=90Ruiz (UCSC), Jos=C3=A9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=C3=BAs Gonz=C3=A1= lez (UNAM), Carlos Rom=C3=A1n-Z=C3=BA=C3=B1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 121211A (Mangano, et al., GCN 14057) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=C3=B3mico Nacional on Sierra San Pedro M=C3=A1rtir from 2012 Dec 12.48 to 2012 Dec 12.58 UTC (21.8 to 24.1 hours after the BAT trigger), obtaining a total of 1.8 hours exposures in the r' and i' bands and 0.67 hours of exposure in the Z, Y, J, and H bands.
In comparison with SDSS DR8 and 2MASS, we derive the following detections and upper limits (3-sigma) in the AB magnitude system:
```
 r' 22.9 +/- 0.2
 i' 23.2 +/- 0.2
 Z  22.1 +/- 0.4
 Y  >21.3
 J  >21.9
 H  >21.1
```
These magnitudes are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=C3=B3mico Nacional in San Pedro M=C3=A1rtir.
GCN Circular #14078
David Yu (MPE) reports on behalf of the Fermi GBM Team:
"At 13:47:03.59 UT on 11 December 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 121211A (trigger 376926426 / 121211574) which was also detected by the Swift/BAT (Mangano et al. 2012, GCN 14057). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 74 degrees.
The GBM light curve consists of a double peaked pulse with a duration (T90) of about 5.4 s (50-300 keV). The time-averaged spectrum from T0-3.072 s to T0+1.536 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.30 +/- 0.34 and the cutoff energy, parameterized as Epeak, is 95.96 +/- 12.60 keV.
The event fluence (10-1000 keV) in this time interval is (4.825 +/- 0.507)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.768 s in the 10-1000 keV band is 2.402 +/- 0.202 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #14080
FROM: Nat Butler at Az State U
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez=E2=80=90Ruiz (UCSC), Jos=C3=A9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=C3=BAs Gonz=C3=A1lez (UNAM), Carlos Rom=C3=A1= n-Z=C3=BA=C3=B1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 121211A (Mangano, et al., GCN 14057) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=C3=B3mico Nacional on Sierra San Pedro M=C3=A1rtir for a second time from 2012 Dec 13.46 to 2012 Dec 13.57 UTC (45.2 to 47.8 hours after the BAT trigger), obtaining a total of 1.8 hours exposures in the r' and i' bands, 1.2 hours exposure in the Z and J bands, and 10 minutes exposure in the Y and H bands.
For a source spatially coincident with the UVOT position (Chester et al., GCN 14063), in comparison with SDSS DR8 and 2MASS, we derive the following detections and upper limits (3-sigma) in the AB magnitude system:
```
 r' 23.8 +/- 0.3  (delta=3D -0.9 +/- 0.4)
 i' 24.0 +/- 0.4  (delta=3D -0.8 +/- 0.4)
 Z  >22.4
 Y  >21.8
 J  >21.3
 H  >20.6
```
The delta values give the fade in 24 hours relative to the values quoted in GCN 14077. These magnitudes are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=C3=B3mico Nacional in San Pedro M=C3=A1rtir.
GCN Report 415.1
GCN_Report 415.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_415_1.pdf by V. Mangano at INAF-IASFPA titled: "Swift Observations of GRB 121211A"

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Jochen Greiner, last update: 22-Jan-2013 [Disclaimer]