Gamma-ray Burst 151210A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:14:28 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     666931,   Seg_Num: 0
GRB_RA:           65.182d {+04h 20m 44s} (J2000),
                  65.150d {+04h 20m 36s} (current),
                  65.288d {+04h 21m 09s} (1950)
GRB_DEC:         -71.230d {-71d 13' 48"} (J2000),
                 -71.193d {-71d 11' 34"} (current),
                 -71.347d {-71d 20' 48"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1746 [image_cnts]
TRIGGER_DUR:     80.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        17366 TJD;   344 DOY;   15/12/10
GRB_TIME:        11576.46 SOD {03:12:56.46} UT
GRB_PHI:         -87.55 [deg]
GRB_THETA:        24.12 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.24 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +0  +0  +0  -7  +0 
SUN_POSTN:       256.66d {+17h 06m 39s}  -22.87d {-22d 52' 11"}
SUN_DIST:         85.59 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.40d {+16h 05m 36s}  -16.27d {-16d 16' 17"}
MOON_DIST:        92.50 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.25,-37.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      321.18,-80.02 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 213.98,-19.59 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:15:33 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.189d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.207d {-71d 12' 25"} (J2000)
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11726.75 SOD {03:15:26.75} UT,   150.3 [sec] since BAT Trigger Time
COUNTS:          4    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:     Thu 10 Dec 15 03:17:05 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     666931,   Seg_Num: 0
GRB_RA:           65.182d {+04h 20m 44s} (J2000),
                  65.150d {+04h 20m 36s} (current),
                  65.288d {+04h 21m 09s} (1950)
GRB_DEC:         -71.230d {-71d 13' 48"} (J2000),
                 -71.193d {-71d 11' 34"} (current),
                 -71.347d {-71d 20' 48"} (1950)
GRB_DATE:        17366 TJD;   344 DOY;   15/12/10
GRB_TIME:        11576.46 SOD {03:12:56.46} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -87.55 [deg]
GRB_THETA:        24.12 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     80.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.24 [sigma]
LC_URL:          sw00666931000msb.lc
SUN_POSTN:       256.66d {+17h 06m 39s}  -22.87d {-22d 52' 12"}
SUN_DIST:         85.59 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.42d {+16h 05m 41s}  -16.28d {-16d 16' 29"}
MOON_DIST:        92.49 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.25,-37.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      321.18,-80.02 [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 an image 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 = 213.98,-19.59 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:18:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.207d {-71d 12' 26"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11729.06 SOD {03:15:29.06} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.208
N_STARS:         78
X_OFFSET:        633 [pixels]
Y_OFFSET:        445 [pixels]
X_MAX:           1592 [pixels]
Y_MAX:           1404 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00666931000msufc0152.fits
SUN_POSTN:       256.66d {+17h 06m 39s}  -22.87d {-22d 52' 12"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.43d {+16h 05m 44s}  -16.28d {-16d 16' 35"}
MOON_DIST:        92.52 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.36 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.30,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:18:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.207d {-71d 12' 26"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11729.06 SOD {03:15:29.06} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.208
N_STARS:         78
X_OFFSET:        633 [pixels]
Y_OFFSET:        445 [pixels]
X_MAX:           1592 [pixels]
Y_MAX:           1404 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00666931000msufc0152.fits
SUN_POSTN:       256.66d {+17h 06m 39s}  -22.87d {-22d 52' 12"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.44d {+16h 05m 45s}  -16.28d {-16d 16' 37"}
MOON_DIST:        92.52 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.36 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.30,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:19:34 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     666931,   Seg_Num: 0
GRB_RA:           65.1167d {+04h 20m 28.00s} (J2000),
                  65.0841d {+04h 20m 20.17s} (current),
                  65.2230d {+04h 20m 53.53s} (1950)
GRB_DEC:         -71.2509d {-71d 15' 03.2"} (J2000),
                 -71.2135d {-71d 12' 48.7"} (current),
                 -71.3678d {-71d 22' 04.1"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11753.00 SOD {03:15:53.00} UT,   176.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       256.66d {+17h 06m 40s}  -22.87d {-22d 52' 12"}
SUN_DIST:         85.57 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.44d {+16h 05m 47s}  -16.28d {-16d 16' 41"}
MOON_DIST:        92.47 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.28,-37.37 [deg] galactic lon,lat of the burst
ECL_COORDS:      321.10,-79.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:19:44 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.207d {-71d 12' 26"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11729.06 SOD {03:15:29.06} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     471410144
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0168.fits
SUN_POSTN:       256.67d {+17h 06m 40s}  -22.87d {-22d 52' 13"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.45d {+16h 05m 47s}  -16.28d {-16d 16' 42"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.36 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.30,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:20:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.207d {-71d 12' 26"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11729.06 SOD {03:15:29.06} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     471410144
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0168.fits
SUN_POSTN:       256.67d {+17h 06m 40s}  -22.87d {-22d 52' 13"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.45d {+16h 05m 48s}  -16.28d {-16d 16' 43"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.36 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.30,-80.03 [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:     Thu 10 Dec 15 03:25:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 14"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11887.04 SOD {03:18:07.04} UT,   310.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.502
N_STARS:         129
X_OFFSET:        393 [pixels]
Y_OFFSET:        205 [pixels]
X_MAX:           1832 [pixels]
Y_MAX:           1644 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00666931000msufc0310.fits
SUN_POSTN:       256.67d {+17h 06m 41s}  -22.87d {-22d 52' 14"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.50d {+16h 05m 59s}  -16.29d {-16d 17' 09"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:25:52 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     666931,   Seg_Num: 0
GRB_RA:           65.1188d {+04h 20m 28.51s} (J2000),
                  65.0861d {+04h 20m 20.67s} (current),
                  65.2252d {+04h 20m 54.03s} (1950)
GRB_DEC:         -71.2510d {-71d 15' 03.6"} (J2000),
                 -71.2136d {-71d 12' 49.1"} (current),
                 -71.3679d {-71d 22' 04.4"} (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:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11753.00 SOD {03:15:53.00} UT,   176.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       256.67d {+17h 06m 41s}  -22.87d {-22d 52' 14"}
SUN_DIST:         85.57 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.50d {+16h 06m 00s}  -16.29d {-16d 17' 11"}
MOON_DIST:        92.46 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.28,-37.36 [deg] galactic lon,lat of the burst
ECL_COORDS:      321.09,-79.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:26:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 14"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11887.04 SOD {03:18:07.04} UT,   310.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     471410302
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0326.fits
SUN_POSTN:       256.67d {+17h 06m 41s}  -22.87d {-22d 52' 14"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.50d {+16h 06m 01s}  -16.29d {-16d 17' 13"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:25:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 14"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11887.04 SOD {03:18:07.04} UT,   310.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.502
N_STARS:         129
X_OFFSET:        393 [pixels]
Y_OFFSET:        205 [pixels]
X_MAX:           1832 [pixels]
Y_MAX:           1644 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00666931000msufc0310.fits
SUN_POSTN:       256.67d {+17h 06m 41s}  -22.87d {-22d 52' 14"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.50d {+16h 06m 00s}  -16.29d {-16d 17' 11"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:26:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.188d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 14"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  11887.04 SOD {03:18:07.04} UT,   310.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     471410302
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0326.fits
SUN_POSTN:       256.67d {+17h 06m 41s}  -22.87d {-22d 52' 14"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.51d {+16h 06m 02s}  -16.29d {-16d 17' 14"}
MOON_DIST:        92.51 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [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:     Thu 10 Dec 15 03:31:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.189d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 13"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  12443.08 SOD {03:27:23.08} UT,   866.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.723
N_STARS:         190
X_OFFSET:        393 [pixels]
Y_OFFSET:        205 [pixels]
X_MAX:           1832 [pixels]
Y_MAX:           1644 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00666931000msufc0866.fits
SUN_POSTN:       256.67d {+17h 06m 42s}  -22.87d {-22d 52' 15"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.55d {+16h 06m 12s}  -16.29d {-16d 17' 37"}
MOON_DIST:        92.50 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:31:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.189d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 13"} (J2000)
POINT_ROLL:      190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  12443.08 SOD {03:27:23.08} UT,   866.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.723
N_STARS:         190
X_OFFSET:        393 [pixels]
Y_OFFSET:        205 [pixels]
X_MAX:           1832 [pixels]
Y_MAX:           1644 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00666931000msufc0866.fits
SUN_POSTN:       256.67d {+17h 06m 42s}  -22.87d {-22d 52' 15"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.55d {+16h 06m 12s}  -16.29d {-16d 17' 38"}
MOON_DIST:        92.50 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:32:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.189d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 13"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  12443.08 SOD {03:27:23.08} UT,   866.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     471410858
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0882.fits
SUN_POSTN:       256.67d {+17h 06m 42s}  -22.87d {-22d 52' 16"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.56d {+16h 06m 15s}  -16.30d {-16d 17' 43"}
MOON_DIST:        92.50 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Dec 15 03:32:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     666931,   Seg_Num: 0
POINT_RA:         65.189d {+04h 20m 45s} (J2000)
POINT_DEC:       -71.204d {-71d 12' 13"} (J2000)
ROLL:            190.571d
IMG_START_DATE:  17366 TJD;   344 DOY;   15/12/10
IMG_START_TIME:  12443.08 SOD {03:27:23.08} UT,   866.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     471410858
X_OFFSET:        952 [pixels]
Y_OFFSET:        764 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1112
Y_GRB_POS:       924
BINNING_INDEX:   1
IM_URL:          sw00666931000msuni0882.fits
SUN_POSTN:       256.68d {+17h 06m 42s}  -22.87d {-22d 52' 16"}
SUN_DIST:         85.62 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      241.56d {+16h 06m 15s}  -16.30d {-16d 17' 44"}
MOON_DIST:        92.50 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      284.22,-37.37 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      321.32,-80.03 [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 #18678
P. A. Evans (U Leicester), S. D. Barthelmy (GSFC), J. A. Kennea (PSU), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 03:12:56 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151210A (trigger=666931). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 65.182, -71.230 which is
```
   RA(J2000)  =  04h 20m 44s
   Dec(J2000) = -71d 13' 48"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a couple of peaks with a duration of about 60 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~14 sec after the trigger.
The XRT began observing the field at 03:15:26.7 UT, 150.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 65.1177, -71.2509 which is equivalent to:
```
   RA(J2000)  = 04h 20m 28.25s
   Dec(J2000) = -71d 15' 03.4"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 105 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 consistent with the Galactic value of 1.30 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 150 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 0.12.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.ac.uk). 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 #18679
Yanhui Han (NAOC/CAS, HUST), Thomas Kruehler (ESO), Dong Xu (NAOC/CAS), Youdong Hu (IAA-CSIC), and Yin Qing (Geneva Observatory) report:
We observed the field of GRB 151210A (Evans et al., GCN 18678) with the 1-m LCOGT telescope at Cerro Tololo, Chile. Observations started 03:34:06 UT on 2015-12-10 (i.e., 21.2 mins after the GRB), and we obtained 10x240s R-band images.
Within the XRT error circle (Evans et al., GCN 18678), an uncatalogued optical source is detected in our stacked image at coordinates:
```
R. A. = 04:20:28.048
Dec. = -71:15:02.53
```
with an error radius of ~0.5 arcsec. The object roughly has R~21.5 mag, calibrated with the nearby USNO B1 field. We thus consider that the source is very likely the optical afterglow of GRB 151220A.
GCN Circular #18680
P. Wiseman, T. Kruehler (both MPE Garching), D. A. Kann (TLS Tautenburg), C. Delvaux, and J. Greiner (both MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 151210A (Swift trigger 666931; Evans et al., GCN #18678) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 03:17:35 UT on 10/12/2015, 279 sec after the GRB trigger, and are ongoing.
We detect a source not seen in the DSS at the edge of the refined XRT error circle (Evans et al., GCN #18678) at:
```
RA (J2000) = 04:20:27.91
Dec. (J2000) = -71:15:02.6
```
with an error of 0".5 in each coordinate. We suggest that this is the afterglow of the GRB, as we also detect fading between observations. This source is also seen by LCOGT (Han et al., GCN #18679).
Based on observations with an integration time of 594 sec (griz) and 540 sec (JHK) centered 54 min after the GRB trigger, we derive magnitudes
```
g' = 23.9 +/- 0.2  mag,
r' = 22.1 +/- 0.1 mag,
i' = 21.7 +/- 0.1 mag,
z' = 21.2 +/- 0.1 mag,
J = 20.3 +/- 0.2 mag, and
H = 19.8 +/- 0.2 mag.
```
The given limits are derived based on calibrating the images against GROND zero points and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B- V)= 0.11 in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN Circular #18681
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1491 s of XRT Photon Counting mode data and 2 UVOT images for GRB 151210A, 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 = 65.11644, -71.25075 which is equivalent to:
```
RA (J2000): 04h 20m 27.95s
Dec (J2000): -71d 15' 02.7"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #18682
D.N. Burrows (PSU), T.G.R. Roegiers (PSU), A.P. Beardmore (U. Leicester), S.L. Gibson (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), L.M. McCauley (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 7.1 ks of XRT data for GRB 151210A (Evans et al. GCN Circ. 18678), from 137 s to 23.7 ks after the BAT trigger. The data comprise 145 s in Windowed Timing (WT) mode (the first 6 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 18681).
The light curve can be modelled with an initial power-law decay with an index of alpha=5.1 (+0.9, -0.8), followed by a break at T+280 s to an alpha of 0.56 (+/-0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.89 (+0.23, -0.09). The best-fitting absorption column is consistent with the Galactic value of 1.3 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.3 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 1.3 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.89 (+0.23, -0.09)
```
If the light curve continues to decay with a power-law decay index of 0.56, the count rate at T+24 hours will be 9.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.2 x 10^-13 (4.0 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/00666931.
This circular is an official product of the Swift-XRT team.
GCN Circular #18683
S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), P. A. Evans (U Leicester), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 151210A (trigger #666931) (Evans, et al., GCN Circ. 18678). The BAT ground-calculated position is RA, Dec = 65.080, -71.225 deg, which is
```
   RA(J2000)  =  04h 20m 19.1s 
   Dec(J2000) = -71d 13' 28.9" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 60%.
The mask-weighted light curve shows several peaks starting at ~T-55 sec, with the brightest peaks at ~T+14 and ~T+38 sec, and ending at ~T+60sec. T90 (15-350 keV) is 94.9 +- 10.4 sec (estimated error including systematics).
The time-averaged spectrum from T-57.19 to T+48.36 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.82 +- 0.79, and Epeak of 49.4 +- 15.3 keV (chi squared 53.7 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+38.82 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.83 +- 0.15 (chi squared 59.89 for 57 d.o.f.). 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/666931/BA/
GCN Circular #18684
S. R. Oates (IAA-CSIC/UCL-MSSL) and P. A. Evans (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151210A 153 s after the BAT trigger (Evans et al., GCN Circ. 18678). No optical afterglow consistent with the optical position (Han et al., GCN Circ. 18679; Wiseman et al. GCN Circ. 18680) 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           153          302          147         >21.1
u_FC               311          560          246         >20.5
white              153         7227          805         >22.1
v                  640         7549          442         >20.3
b                  566         7023          510         >20.9
u                  311         6817          736         >20.8
w1                 690         6613          313         >20.4
m2                 840         6407          235         >19.8
w2                 616         7433          490         >20.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 10-Dec-2015 [Disclaimer]