Gamma-ray Burst 131227A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

No BAT_POSITION message received

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:46:22 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     582184,   Seg_Num: 0
GRB_RA:           67.3799d {+04h 29m 31.17s} (J2000),
                  67.5988d {+04h 30m 23.71s} (current),
                  66.5983d {+04h 26m 23.60s} (1950)
GRB_DEC:         +28.8823d {+28d 52' 56.2"} (J2000),
                 +28.9121d {+28d 54' 43.6"} (current),
                 +28.7735d {+28d 46' 24.4"} (1950)
GRB_ERROR:       6.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.01e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.09 [sigma]
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17148.04 SOD {04:45:48.04} UT,   82688.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.23 261.56 243.48
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       276.08d {+18h 24m 20s}  -23.32d {-23d 19' 08"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.72d {+13h 30m 54s}  -10.44d {-10d 26' 10"}
MOON_DIST:       134.24 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      170.07,-13.42 [deg] galactic lon,lat of the burst
ECL_COORDS:       70.17,  6.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:46:44 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     582184,   Seg_Num: 0
GRB_RA:           67.3799d {+04h 29m 31.1s} (J2000),
                  67.5988d {+04h 30m 23.7s} (current),
                  66.5983d {+04h 26m 23.6s} (1950)
GRB_DEC:         +28.8823d {+28d 52' 56.2"} (J2000),
                 +28.9121d {+28d 54' 43.6"} (current),
                 +28.7735d {+28d 46' 24.4"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       26 [cnts]
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17148.04 SOD {04:45:48.04} UT,   82688.4 [sec] since BAT Trigger Time
CENTROID_X:      275.96,  raw= 276  [pixels]
CENTROID_Y:      264.76,  raw= 265  [pixels]
ROLL:            275.47 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -77.88
GRB_POS_XRT_Z:   -69.14
IMAGE_URL:       sw00582184000msxps_rw.img
SUN_POSTN:       276.08d {+18h 24m 20s}  -23.32d {-23d 19' 07"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.73d {+13h 30m 54s}  -10.44d {-10d 26' 13"}
MOON_DIST:       134.24 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      170.07,-13.42 [deg] galactic lon,lat of the burst
ECL_COORDS:       70.17,  6.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:46:36 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     582184,   Seg_Num: 0
GRB_RA:           67.3799d {+04h 29m 31.1s} (J2000),
                  67.5988d {+04h 30m 23.7s} (current),
                  66.5983d {+04h 26m 23.6s} (1950)
GRB_DEC:         +28.8823d {+28d 52' 56.2"} (J2000),
                 +28.9121d {+28d 54' 43.6"} (current),
                 +28.7735d {+28d 46' 24.4"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       26 [cnts]
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17148.04 SOD {04:45:48.04} UT,   82688.4 [sec] since BAT Trigger Time
CENTROID_X:      275.96,  raw= 276  [pixels]
CENTROID_Y:      264.76,  raw= 265  [pixels]
ROLL:            275.47 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -77.88
GRB_POS_XRT_Z:   -69.14
IMAGE_URL:       sw00582184000msxps_rw.img
SUN_POSTN:       276.08d {+18h 24m 20s}  -23.32d {-23d 19' 08"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.73d {+13h 30m 54s}  -10.44d {-10d 26' 12"}
MOON_DIST:       134.24 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      170.07,-13.42 [deg] galactic lon,lat of the burst
ECL_COORDS:       70.17,  6.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:51:40 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     582184,   Seg_Num: 0
GRB_RA:           67.386d {+04h 29m 33s} (J2000),
                  67.605d {+04h 30m 25s} (current),
                  66.604d {+04h 26m 25s} (1950)
GRB_DEC:         +28.864d {+28d 51' 52"} (J2000),
                 +28.894d {+28d 53' 40"} (current),
                 +28.756d {+28d 45' 21"} (1950)
GRB_DATE:        16653 TJD;   361 DOY;   13/12/27
GRB_TIME:        17091.21 SOD {04:44:51.21} UT
TRIGGER_INDEX:   124
GRB_PHI:         -70.64 [deg]
GRB_THETA:        14.07 [deg]
DELTA_TIME:      -24.00 [sec]
TRIGGER_DUR:      [sec],  copy from BAT_POS unavailable
SOLN_STATUS:     0x0
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00582184000msb.lc
SUN_POSTN:       276.09d {+18h 24m 21s}  -23.32d {-23d 19' 07"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.77d {+13h 31m 05s}  -10.45d {-10d 27' 00"}
MOON_DIST:       134.28 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      170.09,-13.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       70.17,  6.97 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:58:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.399d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.859d {+28d 51' 33"} (J2000)
POINT_ROLL:      275.466d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17157.59 SOD {04:45:57.59} UT,   82697.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.181
N_STARS:         35
X_OFFSET:        592 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1551 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00582184000msufc82697.fits
SUN_POSTN:       276.09d {+18h 24m 23s}  -23.32d {-23d 19' 06"}
SUN_DIST:        153.90 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.84d {+13h 31m 21s}  -10.47d {-10d 28' 08"}
MOON_DIST:       134.34 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.10,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 04:59:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.399d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.859d {+28d 51' 33"} (J2000)
POINT_ROLL:      275.466d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17157.59 SOD {04:45:57.59} UT,   82697.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.181
N_STARS:         35
X_OFFSET:        592 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1551 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00582184000msufc82697.fits
SUN_POSTN:       276.09d {+18h 24m 23s}  -23.32d {-23d 19' 06"}
SUN_DIST:        153.90 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.84d {+13h 31m 21s}  -10.47d {-10d 28' 10"}
MOON_DIST:       134.34 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.10,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [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 27 Dec 13 05:00:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.399d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.859d {+28d 51' 33"} (J2000)
ROLL:            275.466d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17157.59 SOD {04:45:57.59} UT,   82697.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     409812369
X_OFFSET:        1008 [pixels]
Y_OFFSET:        941 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1168
Y_GRB_POS:       1101
BINNING_INDEX:   1
IM_URL:          sw00582184000msuni82709.fits
SUN_POSTN:       276.10d {+18h 24m 23s}  -23.32d {-23d 19' 06"}
SUN_DIST:        153.90 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.85d {+13h 31m 24s}  -10.47d {-10d 28' 22"}
MOON_DIST:       134.35 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.10,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 05:00:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.399d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.859d {+28d 51' 33"} (J2000)
ROLL:            275.466d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17157.59 SOD {04:45:57.59} UT,   82697.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     409812369
X_OFFSET:        1008 [pixels]
Y_OFFSET:        941 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1168
Y_GRB_POS:       1101
BINNING_INDEX:   1
IM_URL:          sw00582184000msuni82709.fits
SUN_POSTN:       276.10d {+18h 24m 23s}  -23.32d {-23d 19' 06"}
SUN_DIST:        153.90 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.85d {+13h 31m 25s}  -10.47d {-10d 28' 26"}
MOON_DIST:       134.36 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.10,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [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:     Fri 27 Dec 13 05:05:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.402d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.858d {+28d 51' 30"} (J2000)
POINT_ROLL:      275.469d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17369.48 SOD {04:49:29.48} UT,   82909.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.892
N_STARS:         17
X_OFFSET:        688 [pixels]
Y_OFFSET:        621 [pixels]
X_MAX:           1647 [pixels]
Y_MAX:           1580 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00582184000msufc82909.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.90d {+13h 31m 35s}  -10.49d {-10d 29' 09"}
MOON_DIST:       134.40 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.11,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 05:05:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.402d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.858d {+28d 51' 30"} (J2000)
POINT_ROLL:      275.469d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17369.48 SOD {04:49:29.48} UT,   82909.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.892
N_STARS:         17
X_OFFSET:        688 [pixels]
Y_OFFSET:        621 [pixels]
X_MAX:           1647 [pixels]
Y_MAX:           1580 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00582184000msufc82909.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.90d {+13h 31m 36s}  -10.49d {-10d 29' 14"}
MOON_DIST:       134.40 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.11,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [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 27 Dec 13 05:07:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            28.858d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  18022.80 SOD {05:00:22.80} UT,   83563.1 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1279 [pixels]
WIDTH:           386 [pixels]
HEIGHT:          1063 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00582184000msuni82921.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:         84.59 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      202.92d {+13h 31m 40s}  -10.49d {-10d 29' 30"}
MOON_DIST:       155.11 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 05:07:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:          0.000d {+00h 00m 00s} (J2000)
POINT_DEC:        +0.000d {+00d 00' 00"} (J2000)
ROLL:            28.858d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  18022.80 SOD {05:00:22.80} UT,   83563.1 [sec] since BAT Trigger Time
FILTER:          0, illegal value
EXPOSURE_ID:     65537
X_OFFSET:        911 [pixels]
Y_OFFSET:        1279 [pixels]
WIDTH:           386 [pixels]
HEIGHT:          1063 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       0
BINNING_INDEX:   0
IM_URL:          sw00582184000msuni82921.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:         84.59 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      202.92d {+13h 31m 40s}  -10.49d {-10d 29' 32"}
MOON_DIST:       155.11 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:       96.34,-60.19 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        0.00,  0.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        WARNING: This Notice was received with 1 (or more) critical values out of range.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 1x1 binning (ie no compression).  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 05:08:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.402d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.858d {+28d 51' 30"} (J2000)
POINT_ROLL:      275.469d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17948.26 SOD {04:59:08.26} UT,   83488.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.139
N_STARS:         114
X_OFFSET:        448 [pixels]
Y_OFFSET:        381 [pixels]
X_MAX:           1887 [pixels]
Y_MAX:           1820 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00582184000msufc83488.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.93d {+13h 31m 42s}  -10.50d {-10d 29' 41"}
MOON_DIST:       134.43 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.11,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Dec 13 05:09:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     582184,   Seg_Num: 0
POINT_RA:         67.402d {+04h 29m 36s} (J2000)
POINT_DEC:       +28.858d {+28d 51' 30"} (J2000)
POINT_ROLL:      275.469d
IMG_START_DATE:  16653 TJD;   361 DOY;   13/12/27
IMG_START_TIME:  17948.26 SOD {04:59:08.26} UT,   83488.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.139
N_STARS:         114
X_OFFSET:        448 [pixels]
Y_OFFSET:        381 [pixels]
X_MAX:           1887 [pixels]
Y_MAX:           1820 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00582184000msufc83488.fits
SUN_POSTN:       276.10d {+18h 24m 24s}  -23.32d {-23d 19' 05"}
SUN_DIST:        153.89 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      202.93d {+13h 31m 43s}  -10.50d {-10d 29' 45"}
MOON_DIST:       134.43 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      170.11,-13.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       70.18,  6.96 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #15616
S. R. Oates (UCL-MSSL), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 04:44:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 131227A (trigger=582184). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 67.386, +28.864 which is
```
   RA(J2000) = 04h 29m 33s
   Dec(J2000) = +28d 51' 52"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 04:45:48.0 UT, 57 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 67.3781, 28.8827 which is equivalent to:
```
   RA(J2000)  = 04h 29m 30.74s
   Dec(J2000) = +28d 52' 57.9"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.53 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 2.1 (+2.23/-1.94) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 6.01e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 66 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 1.02.
Burst Advocate for this burst is S. R. Oates (samantha.oates AT ucl.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 #15617
WeiKang Zheng, Alexei V. Filippenko, Adam Morgan (UC Berkeley), and S. B. Cenko (NASA/Goddard Space Flight Center) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to GRB 131227A (Oates et al., GCN 15616) starting at 04:47:49 UT, 178 s after the burst. Observations were performed with an automatic sequence in the V, I, and clear(roughly R) filters, and the exposure time was 20 s per image. Within the XRT error circle, we detected a new faint source at coordinate of (J2000):
Ra = 04:29:30.83, Dec= +28:52:58.81 (uncertainty about 1")
The object faded from mag ~18.6 to be below than 20.0 in our clear band image about 10 minutes after (calibrated to USNO B1.0). We suggest this is the OT of GRB 131227A. Further observations are encouraged.
GCN Circular #15618
P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using 4481 s of XRT Photon Counting mode data and 6 UVOT images, 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 = 67.37825, 28.88310 which is equivalent to:
```
RA (J2000):  04 29 30.78
Dec (J2000): +28 52 59.2
```
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 is an official product of the Swift-XRT team.
GCN Circular #15620
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 (NASA/UMBC), C. B. Markwardt (GSFC), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), T. Sakamoto (AGU), 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+651 sec from recent telemetry downlinks, we report further analysis of BAT GRB 131227A (trigger #582184) (Oates, et al., GCN Circ. 15616). The BAT ground-calculated position is RA, Dec = 67.369, 28.879 deg which is
```
   RA(J2000)  =  04h 29m 28.5s 
   Dec(J2000) = +28d 52' 44.3" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 90%.
The mask-weighted light curve shows several overlapping peaks starting at ~T-2 sec, peaking at ~T+2 sec, and ending at ~T+22 sec with a long low-level tail out to ~T+100 sec. T90 (15-350 keV) is 18.0 +- 1.6 sec (estimated error including systematics).
The time-averaged spectrum from T-1.19 to T+19.23 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.36 +- 0.12. The fluence in the 15-150 keV band is 8.4 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.61 sec in the 15-150 keV band is 1.1 +- 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/582184/BA/
GCN Circular #15621
M. De Pasquale (UCL-MSSL) and S. R. Oates (UCL-MSSL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131227A 66 s after the BAT trigger (Oates et al. GCN Circ. 15616). No optical afterglow consistent with the enhanced XRT position (Evans et al. GCN Circ. 15618) or the source detected by KAIT (Zheng et al. GCN 15617) 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            66          216          147         >20.6
u_FC               278          528          246         >19.9
white               66        13019         1430         >21.9
v                  608         6785          471         >19.7
b                  534        12318         1160         >21.1
u                  278        11406         1366         >20.9
w1                5558         7195          393         >20.1
w2                4942         6580          393         >20.5
```
The magnitudes in the table are not corrected for the strong Galactic extinction due to the reddening of E(B-V) = 1.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15622
D. Xu (DARK/NBI), T.-M. Zhang, L.-P. Xin, F. Xiao (NAOC) report:
We observed the field of GRB 131227A (Oates et al., GCN 15616) using the 2.16m Xinglong telescope, equipped with BFOSC and located in Heibei, China. We obtained 2x600s R-band images with a mean time of 9.086 hr after the BAT trigger.
At the afterglow position (Zheng et al., GCN 15617), which is within the XRT error circle (Evans & Goad, GCN 15618), the afterglow has decayed to have R>21.2 mag, calibrated with nearby USNO B1 field.
GCN Circular #15623
V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB) and S.R. Oates report on behalf of the Swift-XRT team:
We have analysed 8.6 ks of XRT data for GRB 131227A (Oates et al. GCN Circ. 15616), from 63 s to 18.8 ks after the BAT trigger. The data comprise 1.8 ks in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. Using 4789 s of PC mode data and 7 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 67.37831, +28.88296 which is equivalent to:
```
RA (J2000): 04h 29m 30.80s
Dec(J2000): +28d 52' 58.7"
```
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.110 (+0.029, -0.028).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.28 (+0.22, -0.21). The best-fitting absorption column is 4.4 (+0.9, -0.8) x 10^21 cm^-2, in excess of the Galactic value of 1.5 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.93 (+0.22, -0.21) and a best-fitting absorption column of 4.9 (+1.2, -1.1) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.9 x 10^-11 (8.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.9 (+1.2, -1.1) x 10^21 cm^-2
Galactic foreground: 1.5 x 10^21 cm^-2
Excess significance: 5.3 sigma
Photon index:	     1.93 (+0.22, -0.21)
```
If the light curve continues to decay with a power-law decay index of 1.110, the count rate at T+24 hours will be 3.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.9 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/00582184.
This circular is an official product of the Swift-XRT team.
GCN Circular #15624
A. Cucchiara (ORAU/NASA-GSFC) and S.B. Cenko (NASA-GSFC) report on behalf of a larger collaboration:
"On December 27.42 UT (~ 5.1 hr after the Swift trigger) we began observing the afterglow of GRB 131227A (Oates et al. GCN 15616, Zheng et al. GCN 15617) with the GMOS spectrograph mounted on the Gemini-North telescope.
Under poor seeing conditions the afterglow was marginally detected in our i=92-band acquisition image. Nevertheless, we performed a spectroscopic sequence of 2x900s spectra with GMOS and the R400 grating, covering the 4400-8600A wavelength range.
Clear evidence of continuum flux is detected beyond 7600A, while no flux is present in either spectra nor in a coadded spectrum blueward of this wavelength. No other obvious emission or absorption features are present in the spectrum, though the signal-to-noise ratio is not extremely high.
If this break is due to Lyman-alpha, the implied GRB redshift would be z~5.3. We caution, however, that this line of sight is subject to high galactic extinction (A_V=3D 2.8).
We thank the Gemini staff for performing these observations under challenging conditions, in particular Marie Lemoine-Busserolle."
GCN Circular #15625
S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a larger collaboration:
We observed the location of the optical afterglow (Zheng et al., GCN 15617) of the Swift GRB 131227A (Oates et al., GCN 15616) with the robotic Palomar 60 inch telescope. Observations were obtained in the r', i', and z' filters beginning at 05:59 UT on 2013 Dec 27 (~ 1.24 hours after the Swift trigger time). We do not detect any sources at the location of the KAIT optical afterglow. Using nearby point sources from the USNO-B1 catalog for reference, we calculate an upper limit of r > 21.0 mag at a mean epoch of 1.50 hr after the Swift trigger.
GCN Circular #15632
D. A. Kann (MPE Garching), A. Nicuesa Guelbenzu (TLS Tautenburg) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 131227A (Swift trigger 582184; Oates et al., GCN 15616) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at La Silla Observatory (Chile).
Observations started at 02:10 UT on December 28th, around 21.4 hrs after the GRB trigger, and lasted for 2 hours. They were performed at an average seeing of 1".0 and at an average airmass of 2.
At the position of the optical afterglow reported by Zheng et al. (GCN 15617) and Cucchiara et al. (priv. comm., see also GCN 15624) we do not detect any source down to 3-sigma AB limiting magnitudes of
```
g' > 25.7,
r' > 25.6,
i' > 24.8,
z' > 24.6,
J > 21.8,
H > 21.1, and
K > 19.7.
```
We do detect a compact source to the north-east, at
```
RA (J2000) = 04:29:30.90
Dec. (J2000) = +28:53:00.3
```
with an uncertainty of 0".3 and AB magnitudes
```
r' = 24.28 +/- 0.1,
i' = 24.19 +/- 0.1,
z' = 22.82 +/- 0.1, and
J  = 20.66 +/- 0.4.
```
It is undetected to above-mentioned limits in the other filters. The relationship of this source to the afterglow is unclear.
The given limits and magnitudes are derived based on calibrating the images against GROND zeropoints in g'r'i'z' and 2MASS field stars in JHK and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 1.02 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15649
WeiKang Zheng, Alexei V. Filippenko, Adam Morgan (UC Berkeley), and S. B. Cenko (NASA/Goddard Space Flight Center) report on behalf of the KAIT GRB team:
We analyzed the early time KAIT data of GRB 131227A (Oates et al., GCN 15616). The afterglow is easily detected in our clear and I band images, but not in V band images (single or co-added). After correcting for the large Galactic extinction (A_V = 2.8 mag, A_I = 1.5 mag; Schlegel et al., 2011, ApJ, 737, 103), we found the afterglow had a color of (V - I) > 1.2 mag at early times (~200 s - 900 s). This is consistent with the spectral break around 7600 A reported by Cucchiara & Cenko (GCN 15624), but still not so constraining to say the break is caused by Lyman-alpha.
Due to lack of emission below 7600 A (either because of extinction or Lyman-alpha break), we calibrated the KAIT clear image to the i' band. Our preliminary result shows the afterglow decays as a power law with alpha = -0.99. The late time upper limit reported by Kann et al. (GCN 15632) is below the extrapolation of the line.
The preliminary light curve can be found at the following link: http://128.32.15.133/kait/grb/131227A/GRB131227A.png

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Jochen Greiner, last update: 01-Jan-2014 [Disclaimer]