Gamma-ray Burst 071227

(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:     Thu 27 Dec 07 20:14:10 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     299787,   Seg_Num: 0
GRB_RA:           58.120d {+03h 52m 29s} (J2000),
                  58.166d {+03h 52m 40s} (current),
                  57.830d {+03h 51m 19s} (1950)
GRB_DEC:         -55.953d {-55d 57' 08"} (J2000),
                 -55.929d {-55d 55' 44"} (current),
                 -56.100d {-56d 06' 00"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4931 [cnts]    Image_Peak=201 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       21838 [cnts]
BKG_TIME:        72813.53 SOD {20:13:33.53} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14461 TJD;   361 DOY;   07/12/27
GRB_TIME:        72827.04 SOD {20:13:47.04} UT
GRB_PHI:         -84.09 [deg]
GRB_THETA:        28.53 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     37.85 [sigma]
IMAGE_SIGNIF:    8.54 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3 +13  +0  +0  +7  +1 
SUN_POSTN:       276.20d {+18h 24m 47s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.44 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.69d {+09h 50m 46s}  +13.43d {+13d 25' 57"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.44,-46.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       19.83,-71.68 [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 = 76.56,-1.67 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:15:36 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     299787,   Seg_Num: 0
GRB_RA:           58.1307d {+03h 52m 31.3s} (J2000),
                  58.1771d {+03h 52m 42.5s} (current),
                  57.8409d {+03h 51m 21.8s} (1950)
GRB_DEC:         -55.9831d {-55d 58' 59.1"} (J2000),
                 -55.9596d {-55d 57' 34.6"} (current),
                 -56.1307d {-56d 07' 50.4"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.59e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.00 [sigma]
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72906.13 SOD {20:15:06.13} UT,   79.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.23 261.29 243.67
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       276.20d {+18h 24m 47s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.42 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.70d {+09h 50m 49s}  +13.43d {+13d 25' 37"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.48,-46.75 [deg] galactic lon,lat of the burst
ECL_COORDS:       19.77,-71.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:15:37 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     299787,   Seg_Num: 0
GRB_RA:           58.1307d {+03h 52m 31.3s} (J2000),
                  58.1771d {+03h 52m 42.5s} (current),
                  57.8409d {+03h 51m 21.8s} (1950)
GRB_DEC:         -55.9831d {-55d 58' 59.1"} (J2000),
                 -55.9596d {-55d 57' 34.6"} (current),
                 -56.1307d {-56d 07' 50.4"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72906.13 SOD {20:15:06.13} UT,   79.1 [sec] since BAT Trigger Time
CENTROID_X:      254.12,  raw= 254  [pixels]
CENTROID_Y:      313.39,  raw= 313  [pixels]
ROLL:            214.58 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   36.29
GRB_POS_XRT_Z:   -113.56
IMAGE_URL:       sw00299787000msxps_rw.img
SUN_POSTN:       276.20d {+18h 24m 47s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.42 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.70d {+09h 50m 49s}  +13.43d {+13d 25' 37"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.48,-46.75 [deg] galactic lon,lat of the burst
ECL_COORDS:       19.77,-71.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:15:45 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     299787,   Seg_Num: 0
GRB_RA:           58.1307d {+03h 52m 31.3s} (J2000),
                  58.1771d {+03h 52m 42.5s} (current),
                  57.8409d {+03h 51m 21.8s} (1950)
GRB_DEC:         -55.9831d {-55d 58' 59.1"} (J2000),
                 -55.9596d {-55d 57' 34.6"} (current),
                 -56.1307d {-56d 07' 50.4"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72906.13 SOD {20:15:06.13} UT,   79.1 [sec] since BAT Trigger Time
CENTROID_X:      254.12,  raw= 254  [pixels]
CENTROID_Y:      313.39,  raw= 313  [pixels]
ROLL:            214.58 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   36.29
GRB_POS_XRT_Z:   -113.56
IMAGE_URL:       sw00299787000msxps_rw.img
SUN_POSTN:       276.20d {+18h 24m 47s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.42 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.71d {+09h 50m 49s}  +13.43d {+13d 25' 35"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.48,-46.75 [deg] galactic lon,lat of the burst
ECL_COORDS:       19.77,-71.71 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:17:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.148d {+03h 52m 35s} (J2000)
POINT_DEC:       -55.951d {-55d 57' 04"} (J2000)
POINT_ROLL:      214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72912.89 SOD {20:15:12.89} UT,   85.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.954
N_STARS:         26
X_OFFSET:        600 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00299787000msufc0085.fits
SUN_POSTN:       276.20d {+18h 24m 48s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.72d {+09h 50m 52s}  +13.42d {+13d 25' 14"}
MOON_DIST:       100.82 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.86,-71.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:17:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.148d {+03h 52m 35s} (J2000)
POINT_DEC:       -55.951d {-55d 57' 04"} (J2000)
POINT_ROLL:      214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72912.89 SOD {20:15:12.89} UT,   85.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.954
N_STARS:         26
X_OFFSET:        600 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00299787000msufc0085.fits
SUN_POSTN:       276.20d {+18h 24m 48s}  -23.32d {-23d 18' 55"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.72d {+09h 50m 53s}  +13.42d {+13d 25' 08"}
MOON_DIST:       100.82 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.86,-71.69 [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 27 Dec 07 20:18:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.148d {+03h 52m 35s} (J2000)
POINT_DEC:       -55.951d {-55d 57' 04"} (J2000)
ROLL:            214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72912.89 SOD {20:15:12.89} UT,   85.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     220479315
X_OFFSET:        977 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1137
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00299787000msuni0085.fits
SUN_POSTN:       276.20d {+18h 24m 48s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 55s}  +13.42d {+13d 24' 57"}
MOON_DIST:       100.82 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.86,-71.69 [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:     Thu 27 Dec 07 20:18:35 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     299787,   Seg_Num: 0
GRB_RA:           58.120d {+03h 52m 29s} (J2000),
                  58.166d {+03h 52m 40s} (current),
                  57.830d {+03h 51m 19s} (1950)
GRB_DEC:         -55.953d {-55d 57' 08"} (J2000),
                 -55.929d {-55d 55' 44"} (current),
                 -56.100d {-56d 06' 00"} (1950)
GRB_DATE:        14461 TJD;   361 DOY;   07/12/27
GRB_TIME:        72827.04 SOD {20:13:47.04} UT
TRIGGER_INDEX:   155
GRB_PHI:         -84.09 [deg]
GRB_THETA:        28.53 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     37.85 [sigma]
IMAGE_SIGNIF:    8.54 [sigma]
LC_URL:          sw00299787000msb.lc
SUN_POSTN:       276.20d {+18h 24m 48s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.44 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 55s}  +13.42d {+13d 24' 56"}
MOON_DIST:       100.84 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.44,-46.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       19.83,-71.68 [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 = 76.56,-1.67 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:18:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.148d {+03h 52m 35s} (J2000)
POINT_DEC:       -55.951d {-55d 57' 04"} (J2000)
ROLL:            214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  72912.89 SOD {20:15:12.89} UT,   85.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     220479315
X_OFFSET:        977 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1137
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00299787000msuni0085.fits
SUN_POSTN:       276.20d {+18h 24m 48s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 56s}  +13.41d {+13d 24' 51"}
MOON_DIST:       100.82 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.86,-71.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:25:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.150d {+03h 52m 36s} (J2000)
POINT_DEC:       -55.949d {-55d 56' 56"} (J2000)
POINT_ROLL:      214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  73018.99 SOD {20:16:58.99} UT,   192.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.899
N_STARS:         32
X_OFFSET:        657 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1616 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00299787000msufc0191.fits
SUN_POSTN:       276.20d {+18h 24m 49s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.79d {+09h 51m 10s}  +13.39d {+13d 23' 20"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.87,-71.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Dec 07 20:25:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.150d {+03h 52m 36s} (J2000)
POINT_DEC:       -55.949d {-55d 56' 56"} (J2000)
POINT_ROLL:      214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  73018.99 SOD {20:16:58.99} UT,   192.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.899
N_STARS:         32
X_OFFSET:        657 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1616 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00299787000msufc0191.fits
SUN_POSTN:       276.21d {+18h 24m 49s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.79d {+09h 51m 11s}  +13.39d {+13d 23' 13"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.87,-71.69 [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 27 Dec 07 20:26:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.150d {+03h 52m 36s} (J2000)
POINT_DEC:       -55.949d {-55d 56' 56"} (J2000)
ROLL:            214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  73018.99 SOD {20:16:58.99} UT,   192.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     220479421
X_OFFSET:        977 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1137
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00299787000msuni0191.fits
SUN_POSTN:       276.21d {+18h 24m 49s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.80d {+09h 51m 12s}  +13.38d {+13d 23' 04"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.87,-71.69 [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:     Thu 27 Dec 07 20:26:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     299787,   Seg_Num: 0
POINT_RA:         58.150d {+03h 52m 36s} (J2000)
POINT_DEC:       -55.949d {-55d 56' 56"} (J2000)
ROLL:            214.580d
IMG_START_DATE:  14461 TJD;   361 DOY;   07/12/27
IMG_START_TIME:  73018.99 SOD {20:16:58.99} UT,   192.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     220479421
X_OFFSET:        977 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1137
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00299787000msuni0191.fits
SUN_POSTN:       276.21d {+18h 24m 49s}  -23.32d {-23d 18' 54"}
SUN_DIST:         94.45 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      147.80d {+09h 51m 12s}  +13.38d {+13d 23' 00"}
MOON_DIST:       100.83 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      267.43,-46.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       19.87,-71.69 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #7147
T. Sakamoto (NASA/UMBC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), S. D. Hunsberger (PSU), K. L. Page (U Leicester), J. L. Racusin (PSU), P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (INAF-IASFPA) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 20:13:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071227 (trigger=299787). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 58.120, -55.953 which is
```
   RA(J2000) = 03h 52m 29s
   Dec(J2000) = -55d 57' 08"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed at least three spikes with a duration of about 5 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~0.5 sec after the trigger.
The XRT began observing the field at 20:15:06 UT, 79 seconds after the BAT trigger. From prompt downlinked data, XRT found a variable, uncatalogued X-ray source located at RA, Dec 58.1316, -55.9833 which is
```
   RA(J2000)  =  03h 52h 31.58s
   Dec(J2000) = -55d 58' 59.9"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 112 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 9.6e-10 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 86 seconds after the BAT trigger, and a second finding chart of 400 seconds in V starting 192 seconds after the trigger. No 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 3-sigma upper limit at the XRT position is 19.9 mag in White, 19.0 in V. 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 extinction corresponding to E(B-V) = 0.01.
Burst Advocate for this burst is T. Sakamoto (takanori AT milkyway.gsfc.nasa.gov). 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 #7148
G. Sato (GSFC/ISAS), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-120 to T+183 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071227 (trigger #299787) (Sakamoto, et al., GCN Circ. 7147). The BAT ground-calculated position is RA, Dec = 58.132, -55.959 deg which is
```
   RA(J2000)  = 3h 52m 31.8s 
   Dec(J2000) = -55d 57' 32" 
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%.
The mask weighted light curve shows multiple peaks during ~2 sec duration of the burst. T90 (15-350 keV) is 1.8 +- 0.4 sec (estimated error including systematics). Therefore, this burst might be classified as a short burst. Additional BAT analysis (e.g. spectral lag) is on-going, and will be presented later.
The time-averaged spectrum from T-0.1 to T+1.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.99 +- 0.22. The fluence in the 15-150 keV band is 2.2 +- 0.3 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.09 sec in the 15-150 keV band is 1.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #7149
P. D'Avanzo, S. Piranomonte, L.A. Antonelli, S. Covino, D. Fugazza, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. Dalessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team:
The robotic 60-cm REM telescope located at La Silla (Chile) observed the field of the GRB 071227 (Sakamoto et al., GCN 7147). Observations were performed automatically in the both optical (R, I) and NIR (Z, J, H, K) filters at Dec 28.03611 (about 4.6 hours after the burst ) .
A preliminary analysis of the first set of R-band and H-band exposures does not reveal any optical afterglow candidate inside the XRT error box (Sakamoto et al., GCN 7147) We derive the following upper limits of R > 17.0 (calibrated against USNO B1catalog) and H > 15.5 (calibrated against the 2MASS catalog).
Futher analysis are in progress.
GCN Circular #7150
A. Cucchiara (PSU), T. Sakamoto (GSFC/UMBC) report on behalf of the Swift-UVOT team:
The Swift/UVOT observed the field of GRB071227 (trigger #299787) starting 86 seconds after the BAT trigger (Sakamoto et al.2007, GCN Circ. 7147). We do not find any new source in any of the UVOT single observations inside the XRT error circle. Coadding all the images for each single filter an OT candidate has been detected at 3-sigma confidence level in the White filter coadded image at the position
```
RA: 03:52:31.102
DEC: -55:59:00.65
```
with an uncertainty of 0.6 arcsec (90% confidence). This position is 4.5 arcsec from the XRT position.
The 3-sigma upper limits and the detection(in the UVOT photometric system,Breeveld et al., GCN Circ. 6614) are listed.
```
Filter       Tstart   Tstop     Exp      Magnitude  
              (s)      (s)      (s)   

White         86      6129       609      21.73 +- 0.36
v             68      6539       828      > 20.46
b            673      5923       409      > 21.01
u            648      5718       230      > 20.33
uvw1         624      5512       239      > 20.17
uvm2         599     10886      1191      > 21.00
uvw2         703      6334       419      > 20.65
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.01 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7151
E. Berger (Princeton), N. Morrell and M. Roth (LCO) report:
"We observed the position of GRB 071227 (GCN #7148) with the IMACS instrument on the Magellan/Baade telescope starting on 2007 Dec. 28 at 03:52 UT (7.7 hours after the burst). In a 300-sec R-band exposure we detect a single galaxy within the XRT error circle, coincident with the position of the UVOT source (GCN #7150). This object is also visible in the DSS. The galaxy has spiral, edge-on morphology, and a total magnitude of R=19.3 mag. There are no other sources within the XRT error circle to a 3-sigma limiting magnitude of R~22.3 mag."
GCN Circular #7152
P. D'Avanzo (INAF-OA), F. Fiore (INAF-OAR), S. Piranomonte (INAF-OAR), S. Covino, G. Tagliaferri (INAF-OAB), G. Chincarini (Univ. Bicocca) and L. Stella (INAF-OAR) report, on behalf of the MISTICI collaboration:
We observed the field of GRB 071227 (Sakamoto et al., GCN 7147; Sato et al. GCN 7148) with the ESO-VLT equipped with the FORS2 camera. A spectrum (grism 300V) of the galaxy inside the XRT error box (Cucchiara & Sakamoto GCN 7150; Berger et al. GCN 7151) taken on Dec 28.1885 (about 8.3 hours after the burst) displays an emission line at 5154.77 A. Interpreting this feature as [O II] 3728 we infer a tentative redshift of z = 0.383 (based on a preliminary wavelength calibration).
We thank the Paranal staff for excellent support, especially Elena Valenti.
GCN Circular #7153
A.P. Beardmore, K.L. Page (U. Leicester) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift-XRT team:
The Swift-XRT began observing GRB 071227 (trigger #299787) at 20:15:04UT, 79.5 seconds after the BAT trigger (Sakamoto et al., GCN Circ. 7147). Using 382 s of overlapping XRT Photon Counting mode and UVOT V-band data, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) of RA, Dec = 58.13002, -55.98419, which is equivalent to:
```
  RA (J2000):  03h 52m 31.21s
 Dec (J2000): -55d 59' 03.1"
```
with an uncertainty of 2.0 arcsec (radius, 90% confidence). This is 4.5 arcsec away from the position derived from the promptly downlinked XRT data reported in Sakamoto et al. (GCN Circ. 7147), 91 arcsec from the refined BAT position of Sato et al. (GCN Circ. 7148) and 2.6 arcsec from the possible UVOT optical transient reported by Cucchiara and Sakamoto (GCN Circ. 7150).
The XRT light curve from 210s to 34.8ks after the BAT trigger can be modelled by a doubly broken power-law, with parameters alpha1 = 1.1 +/- 0.2, tbreak1 = 183 +/- 7s, alpha2 = 5.3 +1.2 -0.6, tbreak2 = 389 +/- 65s, alpha3 = 1.1 +/- 0.2.
The XRT spectrum from a time interval spanning 104s to 208s after the BAT trigger is well fit by an absorbed power-law, with a photon index of 1.62+/-0.14 and a column density (9.3+/-4.3)e20 cm^-2, in addition to the Galactic column of 2.6e20 cm^-2 in this direction. The observed (unabsorbed) 0.3-10.0 keV flux from this period is 3.9e-10 (4.6e-10) ergs cm^-2 s^-1.
The predicted XRT count rate 24 hours after the trigger is 4.0e-4 count s^-1, which corresponds to an observed 0.3-10.0 keV flux of 2.0e-14 ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #7154
E. Berger (Princeton), N. Morrell and M. Roth (LCO) report:
"We obtained three 900-s spectra of the candidate host galaxy of GRB 071227 (GCNs 7150,7151) with IMACS on the Magellan/Baade telescope. We find the same emission line noted by D'Avanzo et al. (GCN 7152), as well as a second emission line which corresponds to [OIII]5006 at the same redshift. From preliminary wavelength calibration we find z=0.384. If this is the host galaxy of GRB 071227, the observed fluence of 2.2e-7 erg/cm^2 (GCN 7148) translates to an isotropic-equivalent gamma-ray energy of 8e49 erg, typical of previous short GRBs."
GCN Circular #7155
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
The short GRB 071227 (Swift-BAT trigger #299787: Sakamoto et al., GCN 7147, Sato et al., GCN 7148) triggered Konus-Wind at T0=72828.722 s UT (20:13:48.722). The Konus-Wind light curve shows a multipeaked structure with a total duration of ~1.7 s. Most of the burst was recorded in the pre-history part of the trigger for which multichannel spectra are not measured. The multichannel spectrum of the remaining part contains too few counts to be analyzed.
Analysis of the Konus-Wind data in three energy bands yields a burst fluence of (1.6 +/- 0.2)x10^-6 erg/cm2, and a 64-ms peak flux measured from T0-0.144 s (3.5 +/- 1.1)x10^-6 erg/cm2/s (both in the 20 keV - 1.3 MeV energy range). The 3-channel time-integrated spectrum can be described by a power law with exponential cutoff model dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep) with alpha ~0.7 and Ep ~1 MeV.
All the quoted errors are estimated at the 1 sigma confidence level.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB071227_T72828/
GCN Circular #7156
T. Sakamoto (GSFC/UMBC), J. Norris (NASA/Ames), T. Ukwatta (GWU), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), M. Stamatikos (GSFC/ORAU)
We further report about the additional analysis of the spectral lag and the extended emission for a possible short GRB 071227. Now, we believe GRB 071227 is very likely a short GRB based on following the BAT prompt emission properties.
1) The spectral lag in 25-50 to 100-350 keV bands is consistent with zero, 0.4 ms +- 14 ms, for 8 ms binning.
2) T90 of the initial spike is 1.8 +- 0.4 sec (Sato et al., GCN 7148) which is in the 'short' range of the BAT burst duration (see figure 9 of the BAT1 catalog paper; Sakamoto et al., ApJS in press, arXiv:0707.4626).
3) We found a hint of the extended emission up to T+~100 sec (Norris et al., ApJ, 643, 266). Although the significance in the image domain is ~4 sigma (15-25 keV), we think this emission is associated with the GRB because of no bright hard X-ray source in the BAT field of view after the spacecraft slew which could be a source of a weak extended emission.
GCN Circular #7157
P. D'Avanzo, S. Covino, D. Fugazza, G. Tagliaferri (INAF-OAB), G. Chincarini (Univ. Bicocca), S. Piranomonte, V. D'Elia, L. Stella (INAF-OAR) and A. Moretti (INAF-OAB) report, on behalf of the MISTICI collaboration:
We observed again the field of the short GRB 071227 (Sakamoto et al., GCN 7147; Sato et al. GCN 7148 and GCN 7156) with the ESO-VLT equipped with the FORS2 camera in imaging mode on Dec 31.2147. We compared our images with respect to our first epoch of observations (Dec 28.1328; D'Avanzo et al., GCN 7152). Image subtraction performed with the ISIS package on our two sets of images clearly shows the presence of an optical afterglow inside the refined XRT error box (Beardmore et al., GCN 7153). This object is clearly associated to the candidate host galaxy (Berger et al. 7151; D'Avanzo et al. GCN 7152). The coordinates of the afterglow are (J2000):
```
R.A. = 03:52:31.26
Dec. = -55:59:03.5
```
with an uncertainty of 0.3". The afterglow is located at about 3.1" from the bulge, which corresponds to about 16.1 kpc at z=0.383 (D'Avanzo et al. GCN 7152; Berger et al. GCN 7154).
A figure showing the result of the subtraction can be found at the following URL:
http://www.brera.inaf.it/utenti/davanzo/public/grb/GRB071227/GRB071227_subtraction.jpg
We acknowledge support from the ESO staff.
GCN Circular #7158
K. Onda, M. Tashiro, Y. Terada, Y. Urata, A. Endo, M. Suzuki, N. Kodaka, K. Morigami (Saitama U.), M. Ohno, T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), K. Yamaoka, Y. E. Nakagawa, S. Sugita (Aoyama Gakuin U.), T. Tamagawa (RIKEN), T. Enoto, R. Miyawaki, K. Nakawaza, K. Makishima (Univ. of Tokyo), M. Yamauchi, E. Sonoda, H. Tanaka, R. Hara (Univ. of Miyazaki), M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report:
The short GRB 071227 (Swift/BAT trigger #299787; Sato et al., GCN 7148; Sakamoto et al., GCN 7156) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2007-12-27 20:13:47.71 UT (=3DT0).
The observed light curve shows a multi-peaked structure with a duration (T90) of about 1.5 seconds. The fluence in 100 - 1000 keV was (1.3 =B1 0.2)*10^-6 erg/cm^2. The 1-s peak flux measured from T0-1s was 2.1 (+0.1, -0.1) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-1s to T0+1s is well fitted by a single power-law with a photon index of 1.2 (+0.2, -0.2) (chi^2/d.o.f =3D 18.5/17).
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
1006.4842 from 25 Jun 10
Letizia Caito et al.: GRB 071227: an additional case of disguised short burst
Ruffini (shortened) [...] Within the Fireshell model [...] a new family of disguised short bursts has been introduced: long bursts with a protracted low instantaneous luminosity due to a low density CircumBurst Medium (CBM). GRB 071227 presents, in the 15-150 keV energy band, a short duration (about 1.8s) spikelike emission followed by a very soft extended tail up to one hundred seconds after the trigger. It is a low luminous (E_{iso}=5.8x10^{50}) near GRB (z=0.383) and there is not an associated type Ib/c bright Supernova (SN). For these reasons GRB 071227 has been classified as a short burst not fulfilling the Amati relation holding for long burst. We check the classification of GRB 071227 within the fireshell model. In particular, we want to test if this burst is another example of disguised short burst, after GRB 970228 and GRB 060614 and, for this reason, it would indeed fulfill the Amati relation. MWe simulate GRB 071227 light curves in the Swift BAT 15-50 keV bandpass and in the XRT (0.3-10 keV) energy band within the fireshell model. We perform simulations of the tail in the 15-50 keV bandpass, as well as of the first part of the X-ray afterglow. This provides: E_{tot}^{e^\pm}= 5.04x10^{51} erg, B=2.0x10^{-4}, E_{P-GRB}/E_{aft} ~ 0.25 and = 3.33 particles/cm^3. Such values are still well in the range of "long duration" GRBs. We interpret the observed energy of the first hard emission by identifying it with the P-GRB emission. The remaining long soft tail indeed fulfills the Amati relation. CONCLUSIONS: GRB 071227, classified in literature as a short burst, by the analysis made within the fireshell scenario results to be another example of disguised short bursts, after GRB 970228 and GRB 060614. A further confirmation of this result is that the soft tail of GRB 071227 fulfills the Amati relation.
1405.5366 from
A. Nicuesa Guelbenzu et al.: Another short-burst host galaxy with an optically obscured high star formation rate: The case of GRB 071227
We report on radio continuum observations of the host galaxy of the short gamma-ray burst 071227 (z=0.381) with the Australia Telescope Compact Array (ATCA). We detect the galaxy in the 5.5 GHz band with an integrated flux density of Fnu = 43 +/- 11 microJy, corresponding to an unobscured star-formation rate (SFR) of about 24 Msun/yr, forty times higher than what was found from optical emission lines. Among the ~30 well-identified and studied host galaxies of short bursts this is the third case where the host is found to undergo an episode of intense star formation. This suggests that a fraction of all short-burst progenitors hosted in star-forming galaxies could be physically related to recent star formation activity, implying a relatively short merger time scale.

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