Gamma-ray Burst 141212A

(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 12 Dec 14 12:14:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     621229,   Seg_Num: 0
GRB_RA:           39.161d {+02h 36m 39s} (J2000),
                  39.370d {+02h 37m 29s} (current),
                  38.463d {+02h 33m 51s} (1950)
GRB_DEC:         +18.151d {+18d 09' 04"} (J2000),
                 +18.216d {+18d 12' 56"} (current),
                 +17.934d {+17d 56' 03"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       500 [cnts]    Image_Peak=88 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       16732 [cnts]
BKG_TIME:        44027.09 SOD {12:13:47.09} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17003 TJD;   346 DOY;   14/12/12
GRB_TIME:        44040.85 SOD {12:14:00.85} UT
GRB_PHI:          76.88 [deg]
GRB_THETA:        22.20 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     30.98 [sigma]
IMAGE_SIGNIF:    11.02 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  +0  +0  +0 +78  +0 
SUN_POSTN:       259.54d {+17h 18m 10s}  -23.09d {-23d 05' 17"}
SUN_DIST:        142.21 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.35d {+09h 57m 25s}   +8.45d {+08d 26' 58"}
MOON_DIST:       105.97 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.25,-38.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.47,  2.70 [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 = 122.27,-11.28 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:15:16 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.136d {+02h 36m 33s} (J2000)
POINT_DEC:       +18.141d {+18d 08' 27"} (J2000)
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44110.01 SOD {12:15:10.01} UT,   69.2 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:17:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     621229,   Seg_Num: 0
GRB_RA:           39.161d {+02h 36m 39s} (J2000),
                  39.370d {+02h 37m 29s} (current),
                  38.463d {+02h 33m 51s} (1950)
GRB_DEC:         +18.151d {+18d 09' 04"} (J2000),
                 +18.216d {+18d 12' 56"} (current),
                 +17.934d {+17d 56' 03"} (1950)
GRB_DATE:        17003 TJD;   346 DOY;   14/12/12
GRB_TIME:        44041.07 SOD {12:14:01.07} UT
TRIGGER_INDEX:   10418
GRB_PHI:          76.88 [deg]
GRB_THETA:        22.20 [deg]
DELTA_TIME:      42.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     30.98 [sigma]
IMAGE_SIGNIF:    11.02 [sigma]
LC_URL:          sw00621229000msb.lc
SUN_POSTN:       259.54d {+17h 18m 10s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.21 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.38d {+09h 57m 32s}   +8.44d {+08d 26' 27"}
MOON_DIST:       106.00 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.25,-38.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.47,  2.70 [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 = 122.27,-11.28 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:18:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.136d {+02h 36m 33s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 25"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44113.31 SOD {12:15:13.31} UT,   72.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.746
N_STARS:         19
X_OFFSET:        314 [pixels]
Y_OFFSET:        683 [pixels]
X_MAX:           1273 [pixels]
Y_MAX:           1642 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00621229000msufc0072.fits
SUN_POSTN:       259.54d {+17h 18m 11s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.38d {+09h 57m 32s}   +8.44d {+08d 26' 25"}
MOON_DIST:       106.03 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.23,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.45,  2.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:18:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.136d {+02h 36m 33s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 25"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44113.31 SOD {12:15:13.31} UT,   72.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.746
N_STARS:         19
X_OFFSET:        314 [pixels]
Y_OFFSET:        683 [pixels]
X_MAX:           1273 [pixels]
Y_MAX:           1642 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00621229000msufc0072.fits
SUN_POSTN:       259.54d {+17h 18m 11s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.39d {+09h 57m 33s}   +8.44d {+08d 26' 20"}
MOON_DIST:       106.03 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.23,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.45,  2.70 [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:     Fri 12 Dec 14 12:19:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.136d {+02h 36m 33s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 25"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44113.31 SOD {12:15:13.31} UT,   72.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     440079326
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0085.fits
SUN_POSTN:       259.54d {+17h 18m 11s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.39d {+09h 57m 35s}   +8.44d {+08d 26' 14"}
MOON_DIST:       106.04 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.23,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.45,  2.70 [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 12 Dec 14 12:19:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.136d {+02h 36m 33s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 25"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44113.31 SOD {12:15:13.31} UT,   72.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     440079326
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0085.fits
SUN_POSTN:       259.55d {+17h 18m 11s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.40d {+09h 57m 35s}   +8.44d {+08d 26' 12"}
MOON_DIST:       106.04 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.23,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.45,  2.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:19:46 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     621229,   Seg_Num: 0
GRB_RA:           39.1264d {+02h 36m 30.33s} (J2000),
                  39.3352d {+02h 37m 20.44s} (current),
                  38.4291d {+02h 33m 42.98s} (1950)
GRB_DEC:         +18.1455d {+18d 08' 43.7"} (J2000),
                 +18.2100d {+18d 12' 35.8"} (current),
                 +17.9285d {+17d 55' 42.4"} (1950)
GRB_ERROR:       7.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44123.00 SOD {12:15:23.00} UT,   82.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       259.55d {+17h 18m 11s}  -23.09d {-23d 05' 18"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.40d {+09h 57m 35s}   +8.44d {+08d 26' 11"}
MOON_DIST:       106.05 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.21,-38.05 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.44,  2.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:24:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 22"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44326.58 SOD {12:18:46.58} UT,   285.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.776
N_STARS:         61
X_OFFSET:        74 [pixels]
Y_OFFSET:        443 [pixels]
X_MAX:           1513 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00621229000msufc0285.fits
SUN_POSTN:       259.55d {+17h 18m 12s}  -23.09d {-23d 05' 19"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.44d {+09h 57m 45s}   +8.42d {+08d 25' 28"}
MOON_DIST:       106.09 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:25:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 22"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44326.58 SOD {12:18:46.58} UT,   285.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.776
N_STARS:         61
X_OFFSET:        74 [pixels]
Y_OFFSET:        443 [pixels]
X_MAX:           1513 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00621229000msufc0285.fits
SUN_POSTN:       259.55d {+17h 18m 12s}  -23.09d {-23d 05' 19"}
SUN_DIST:        142.18 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.44d {+09h 57m 46s}   +8.42d {+08d 25' 25"}
MOON_DIST:       106.09 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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:     Fri 12 Dec 14 12:25:40 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     621229,   Seg_Num: 0
GRB_RA:           39.1246d {+02h 36m 29.90s} (J2000),
                  39.3334d {+02h 37m 20.01s} (current),
                  38.4273d {+02h 33m 42.55s} (1950)
GRB_DEC:         +18.1460d {+18d 08' 45.6"} (J2000),
                 +18.2105d {+18d 12' 37.6"} (current),
                 +17.9290d {+17d 55' 44.2"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44123.00 SOD {12:15:23.00} UT,   82.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       259.55d {+17h 18m 12s}  -23.09d {-23d 05' 19"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.44d {+09h 57m 47s}   +8.42d {+08d 25' 21"}
MOON_DIST:       106.10 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.21,-38.05 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.44,  2.71 [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 12 Dec 14 12:26:23 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 22"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44326.58 SOD {12:18:46.58} UT,   285.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     440079539
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0298.fits
SUN_POSTN:       259.55d {+17h 18m 12s}  -23.09d {-23d 05' 20"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.45d {+09h 57m 48s}   +8.42d {+08d 25' 15"}
MOON_DIST:       106.10 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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 12 Dec 14 12:26:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 22"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44326.58 SOD {12:18:46.58} UT,   285.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     440079539
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0298.fits
SUN_POSTN:       259.55d {+17h 18m 12s}  -23.09d {-23d 05' 20"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.45d {+09h 57m 48s}   +8.42d {+08d 25' 13"}
MOON_DIST:       106.10 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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 #17158
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), B.P. Gompertz (U Leicester), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team:
At 12:14:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 141212A (trigger=621229). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 39.161, +18.151 which is
```
   RA(J2000)  =  02h 36m 39s
   Dec(J2000) = +18d 09' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 0.1 sec. The peak count rate was ~3200 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 12:15:10.0 UT, 69.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 39.1246, 18.1460 which is equivalent to:
```
   RA(J2000)  = 02h 36m 29.90s
   Dec(J2000) = +18d 08' 45.7"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 125 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.03 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 72 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.10.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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 12 Dec 14 12:31:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 23"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44904.10 SOD {12:28:24.10} UT,   863.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.787
N_STARS:         78
X_OFFSET:        74 [pixels]
Y_OFFSET:        443 [pixels]
X_MAX:           1513 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00621229000msufc0863.fits
SUN_POSTN:       259.55d {+17h 18m 13s}  -23.09d {-23d 05' 20"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.49d {+09h 57m 58s}   +8.41d {+08d 24' 31"}
MOON_DIST:       106.14 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Dec 14 12:31:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 23"} (J2000)
POINT_ROLL:      255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44904.10 SOD {12:28:24.10} UT,   863.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.787
N_STARS:         78
X_OFFSET:        74 [pixels]
Y_OFFSET:        443 [pixels]
X_MAX:           1513 [pixels]
Y_MAX:           1882 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00621229000msufc0863.fits
SUN_POSTN:       259.55d {+17h 18m 13s}  -23.09d {-23d 05' 20"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.49d {+09h 57m 58s}   +8.41d {+08d 24' 31"}
MOON_DIST:       106.14 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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:     Fri 12 Dec 14 12:32:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 23"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44904.10 SOD {12:28:24.10} UT,   863.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     440080117
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0876.fits
SUN_POSTN:       259.56d {+17h 18m 13s}  -23.09d {-23d 05' 21"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.50d {+09h 58m 00s}   +8.41d {+08d 24' 20"}
MOON_DIST:       106.15 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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 12 Dec 14 12:33:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     621229,   Seg_Num: 0
POINT_RA:         39.134d {+02h 36m 32s} (J2000)
POINT_DEC:       +18.140d {+18d 08' 23"} (J2000)
ROLL:            255.471d
IMG_START_DATE:  17003 TJD;   346 DOY;   14/12/12
IMG_START_TIME:  44904.10 SOD {12:28:24.10} UT,   863.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     440080117
X_OFFSET:        633 [pixels]
Y_OFFSET:        1002 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       793
Y_GRB_POS:       1162
BINNING_INDEX:   1
IM_URL:          sw00621229000msuni0876.fits
SUN_POSTN:       259.56d {+17h 18m 13s}  -23.09d {-23d 05' 21"}
SUN_DIST:        142.17 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      149.50d {+09h 58m 01s}   +8.40d {+08d 24' 17"}
MOON_DIST:       106.15 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      155.22,-38.05 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.44,  2.70 [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 #17160
T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano, S. Kurita, Y.Ono, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 141212A (T. N. Ukwatta et al. GCN Circular #17158) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2014-12-12 12:14:32 UT (31 sec after the burst). We did not find any new point source within XRT circle in all three bands.
The measured magnitudes are listed below.
```
T0+[sec]      MID-UT      T-EXP[sec]         g'           Rc           Ic
--------------------------------------------------------------------------------------
  61        12:17:29         240                    >19.6     >19.0       >18.3
  422      12:28:07         780                    >20.0      >19.6     > 18.9
  422      12:41:18        2340                  >20.5     >20.1       >19.6
--------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration.
GCN Circular #17161
A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. Aji, R. Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain report:
Skynet observed the Swift BAT/XRT localization of GRB 141212A (Ukwatta et al., GCN 17158, Swift trigger=621229) with the 14" R-COP telescope at Perth Observatory, Australia. Starting at 2014-12-12 12:24 UT and continuing until 14:13 UT (t=10.2m-119m post-trigger), Skynet took a total of 24x160s exposures in the B, V, R, and I bands. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the XRT position. Our 3-sigma limiting magnitudes are:
```
==================================
tmid  expos  fil  limit
==================================
87m   7x160s  B   >19.9
106m  8x160s  V   >20.5
41m   3x160s  R   >20.0
30m   2x80s   I   >18.5
==================================
```
Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.09 (Schlafly & Finkbeiner 2011).
No further Skynet observations are scheduled.
GCN Circular #17162
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, V.A.Poleshchuk Irkutsk State University
E. Gorbovskoy,V. Lipunov, D.Denisenko, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, D.Zimnukhov, A.Kuznetsov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Yekaterinburg, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB141212A 32 sec after notice time and 46 sec after trigger time at 2014-12-12 12:14:47 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box (Ukwatta et alo., GCN 17158) . The 5-sigma upper limit has been about 16.8 mag
Our upper limit on first single and coadd images available on table 1:
Table 1:
```
T_start     T0-T_start   T0-T_mid  Exptime  Limit Coadd
    UT           s           s         s 12:14:47.1    46            51 
10     16.8   -
12:14:47.1    46           497       630     19.2   9
12:30:24.4   983          2251      2160     20.6   12
```
The message may be cited.

GCN Circular #17163
Vladimir Lipunov (Lomonosow Moscow University). I am sorry. The correct representatio of the Table 1 is:

T_start     T0-T_start   T0-T_mid  Exptime  Limit Coadd
    UT           s           s         s
12:14:47.1    46            51        10      16.8   -
12:14:47.1    46           497       630     19.2   9
12:30:24.4   983          2251      2160     20.6   12

The message may be cited.

GCN Circular #17164
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 885 s of XRT Photon Counting mode data and 1 UVOT images for GRB 141212A, 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 = 39.12444, +18.14684 which is equivalent to:
```
RA (J2000): 02h 36m 29.86s
Dec (J2000): +18d 08' 48.6"
```
with an uncertainty of 2.9 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 #17167
J. Gorosabel (IAA-CSIC/UPV-EHU), R. Sanchez-Ramirez (UPV/EHU), S. Hellmich (DLR), S. Mottola (DLR), report on behalf of a larger collaboration:
We observed the field of GRB 141212A (Ukwatta et al. GCN Circ. 17158) with the 1.23m CAHA telescope starting on Dec 12.73309 UT (5.4 hours post bust). The observations were carried out in the I-band. No object brighter than I~21 (Vega) is detected within the XRT error circle (Osborne GCN Circ., 17164).
GCN Circular #17168
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with ORI-40 telescope of Khureltogot observatory. We obtained 2 hours of unfiltered images on Dec. 12 starting on (UT) 12:46:14. In a combined image of the first 5 frames we do not detect any optical source within enhanced Swift-XRT position (Osborne et al., GCN 17164). Preliminary photometry is following
Date UT start t-T0 Filter Exp. ULimit (3sigma) (mid, days) (s)
2014-12-12 12:46:14 0.02422 R 5*60 18.5
The photometry is based on USNO-B1.0 stars
```
USNO-B1_id      RA	         DEC	        R2
1081-0038366	039.120895	+18.127567	16.32	
1081-0038391	039.149945	+18.154739	17.15	
1081-0038340	039.085725	+18.167617	14.41
```
GCN Circular #17169
L. P. Xin, T. M. Zhang, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han and C. Wu on behalf of EAFON report:
We began to observe GRB 141212A (Ukwatta eta l., GCN 17158) with Xinglong 0.8-m TNT telescope at 2014-12-12, 12:14:40(UT), about 39 sec the burst.
In any single W-band frame or coadded image, no any new optical transient was detected within XRT circle (Ukwatta eta l., GCN 17158; Osborne et al, GCN 17164 ) down to 3 sigma limit of R~20 mag at the mid-time of 4 min after the burst, calibrated by the nearby USNO B1.0 R2 mag.
The message may be cited.
GCN Circular #17170
D. Malesani (DARK/NBI), P. D'Avanzo (INAF/OABr), V. D'Elia (INAF/OAR and ASI/ASDC), S. D. Vergani (CNRS/GEPI), G. Andreuzzi (INAF/TNG), A. Garcia de Gurtubai Escudero (INAF/TNG), A. Bonomo (INAF/OATo), report on behalf of the CIBO collaboration:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) using the TNG optical telescope located in La Palma. Observations started on 2014 Dec 12.832 UT (7.73 hr after the GRB) and consisted of 10x240 s in the R band. The PSF in our image was around 1.5".
Within the XRT error circle (Osborne et al., GCN 17164; see also http://www.swift.ac.uk/xrt_positions/), we detect a single, extended object (A), with coordinates (J2000):
```
RA = 02:36:29.95
Dec = +18:08:47.2
```
Its Vega magnitude is R = 22.66 +- 0.23, assuming R = 16.83 for the USNO star at RA = 02:36:35.95, Dec = +18:09:16.8.
We cannot yet make any claim about variability, so the connection of this object with GRB 141212A is unclear. This may be the GRB host, though some contribution from an afterglow cannot be excluded.
We also note the presence of two extended objects just outside the XRT error circle.
```
(B): RA = 02:36:30.25, Dec = +18:08:50.1, R = 22.29 +- 0.16;
(C): RA = 02:36:29.64, Dec = +18:08:50.2, R ~ 24.0
```
Object (C) is barely detected. No other sources are visibile in the proximity of the XRT error circle down to a limiting magnitude of R = 24.
A finding chart can be seen at the following URL: http://www.astro.ku.dk/~malesani/GRB/141212A/GRB141212A_TNG.jpg
GCN Circular #17171
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of XRT data for GRB 141212A (Ukwatta et al. GCN Circ. 17158), from 77 s to 28.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 17164).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.62 (+0.20, -0.16).
If the light curve continues to decay with a power-law decay index of 0.62, the count rate at T+24 hours will be 7.6 x 10^-4 count s^-1
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00621229.
This circular is an official product of the Swift-XRT team.
GCN Circular #17172
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 MITSuME and OISTER collaboration:
We observed the field of GRB 141212A (Ukwatta et al., GCNC 17158) 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 2014-12-12 12:15:02 UT (~62 sec after the burst). We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 17164) 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
-----------------------------------------------------
0.04216    13:14:42    6000.0   >20.5  >20.1  >19.4
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #17175
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 141212A (trigger #621229) (Ukwatta, et al., GCN Circ. 17158). The BAT ground-calculated position is RA, Dec = 39.167, 18.163 deg which is
```
   RA(J2000)  =  02h 36m 40.1s
   Dec(J2000) = +18d 09' 47.1"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 58%.
BAT light curve shows a strong FRED like peak starting around T-0.05 sec and ending around T+0.2 sec. Another softer peak can be seen starting at T+0.2 sec, peaking at T+0.3 sec and ending around T+0.35 sec. T90 (15-350 keV) is 0.30 +- 0.08 sec (estimated error including systematics).
The time-averaged spectrum from T+0.00 to T+0.34 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.61 +- 0.23. The fluence in the 15-150 keV band is 7.2 +- 1.2 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.33 sec in the 15-150 keV band is 1.2 +- 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/621229/BA/
GCN Circular #17177
R. Chornock (Ohio University), W. Fong (University of Arizona), and D. B. Fox (Penn State) report:
We obtained imaging and spectroscopy of the field of the short GRB 141212A (Ukwatta et al., GCN 17158) using GMOS on the 8 m Gemini-North telescope starting at 04:35 UT on 13 December, 16.4 hours after the BAT trigger. In 5x180s of i-band imaging with 0.5" seeing, all three objects found by Malesani et al. (GCN 17170) are well detected. Using an archival calibration, we measure i=22.2 +/- 0.1 mag for object A, the extended object present inside the enhanced XRT error circle (Osborne et al., GCN 17164).
In addition, we oriented a spectroscopic slit through both extended objects A and B (using the terminology of Malesani et al.). We obtained 2x900s of spectroscopy with the R400 grating covering the wavelength range 5890-10100 Angs. Both galaxies exhibit prominent nebular line emission from [O II], H-beta, and [O III]. Galaxy A, the likely host, has a redshift of z=0.596, while Galaxy B has a redshift of z=0.672.
GCN Circular #17178
W. Fong (U. Arizona) and B. A. Zauderer (Harvard) report:
"We observed the field of the short-duration GRB 141212A (Ukwatta et al., GCN 17158) with the Karl G. Jansky Very Large Array (VLA) beginning on 2014 Dec 12.96 UT (10.9 hr post-burst) at a mean frequency of 6 GHz. In 1 hour of observations, we do not detect any radio source within or around the enhanced XRT position (Osborne et al., GCN 17164). We therefore place a 3-sigma limit of ~25 microJy on the radio afterglow of GRB 141212A at 10.9 hr after the burst.
We thank the VLA staff for quickly executing these observations."
GCN Circular #17180
S. R. Oates (IAA-CSIC/UCL-MSSL) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141212A 72 s after the BAT trigger (Ukwatta et al., GCN Circ. 17158). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 17164) 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 the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            72          222          147         >20.6
u_FC               286          535          246         >19.9
white               72         1531          392         >21.2
v                  615         1581          117         >18.8
b                  541         1681          117         >19.8
u                  286         1655          343         >20.1
w1                 664         1631          117         >19.3
w2                 591         1210           39         >18.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.10 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17184
A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
We imaged the field of GRB 141212A detected by SWIFT (trigger 621229) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 123s after the GRB trigger. The elevation of the field increased from 37 degrees above horizon and weather conditions were good.
We do not detect any optical counterpart of the XRT afterglow (Ukwatta et al. GCNC 17158, Malesani et al. GCNC 17170). We give the details of the limiting magnitudes during the twelve first minutes after the trigger:
```
t0+123s to t0+153s : Rlim = 18.6
t0+162s to t0+192s : Rlim = 18.6
t0+200s to t0+230s : Rlim = 18.6
t0+239s to t0+269s : Rlim = 18.6
t0+279s to t0+309s : Rlim = 18.6
t0+320s to t0+410s : Rlim = 19.8
t0+421s to t0+511s : Rlim = 19.8
t0+522s to t0+612s : Rlim = 19.8
t0+622s to t0+712s : Rlim = 19.8
```
We co-added a series of exposures:
```
t0+123s to t0+712s : Rlim = 20.3
```
Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN Circular #17185
D. Kawamura, T. Sakamoto, A. Yoshida (AGU)
We observed the field of GRB 141212A detected by Swift (trigger #621229; Ukwatta et al., GCN Circ. 17158) with the iTelescope.Net (http://www.itelescope.net) T11 (0.50 m Plane Wave) telescope located at the New Mexico Skies Observatory (NM, USA).
4 images of 60 sec exposures were taken in the R filter starting from December 12 12:38:28 (UT) about 24.5 minutes after the trigger and stopped on December 12 12:43:22 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the enhanced X-ray afterglow position (Osborne et al., GCN Circ. 17164). The estimated five sigma upper limit of the combined image (total exposure of 240 sec) is ~19.1 using the USNO-B1 catalog.
GCN Circular #17654
J. Mao, B. Lun and J.-M. Bai (YNAO) report:
We observed the field of GRB 141212A (Ukwatta et al., GCN 17158) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatory. Observations began from UT 12:58:57.9 12th, Dec., 2014 (about 45 mins after the trigger). We did not detect any optical source at XRT position down to a limit of R~22.0. In our single image, it is nearly impossible to distinguish the sources clearly identified by Malesani et al. GCN 17170.
We thank Dr. D., Malesani for his kind suggestion and discussion. J. Mao apologizes for this very later GCN circular submission.
Redshift z= 0.596 +- 0.001 from host galaxy emission (Hbeta, [OIII], [OII])
W.-F. Fong et al. 2022, ApJ 940, 56

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