Gamma-ray Burst 151127A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:09:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     665268,   Seg_Num: 0
GRB_RA:           19.778d {+01h 19m 07s} (J2000),
                  19.747d {+01h 18m 59s} (current),
                  19.896d {+01h 19m 35s} (1950)
GRB_DEC:         -82.774d {-82d 46' 25"} (J2000),
                 -82.690d {-82d 41' 25"} (current),
                 -83.036d {-83d 02' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1014 [cnts]    Image_Peak=81 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   468     E_range: 25-100 keV
BKG_INTEN:       21044 [cnts]
BKG_TIME:        32920.52 SOD {09:08:40.52} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17353 TJD;   331 DOY;   15/11/27
GRB_TIME:        32929.80 SOD {09:08:49.80} UT
GRB_PHI:          -2.26 [deg]
GRB_THETA:        19.99 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    6.86 [sigma]
MERIT_PARAMS:     +1  +0  +0  -2  +2  -3  +0  +0 -27  +0 
SUN_POSTN:       242.84d {+16h 11m 21s}  -21.09d {-21d 05' 28"}
SUN_DIST:         74.32 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.61d {+05h 34m 27s}  +18.30d {+18d 17' 53"}
MOON_DIST:       104.96 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.88,-34.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      288.41,-67.99 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 199.44,-20.39 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:12:44 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     665268,   Seg_Num: 0
GRB_RA:           19.778d {+01h 19m 07s} (J2000),
                  19.747d {+01h 18m 59s} (current),
                  19.896d {+01h 19m 35s} (1950)
GRB_DEC:         -82.774d {-82d 46' 25"} (J2000),
                 -82.690d {-82d 41' 25"} (current),
                 -83.036d {-83d 02' 08"} (1950)
GRB_DATE:        17353 TJD;   331 DOY;   15/11/27
GRB_TIME:        32929.80 SOD {09:08:49.80} UT
TRIGGER_INDEX:   468
GRB_PHI:          -2.26 [deg]
GRB_THETA:        19.99 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    6.86 [sigma]
LC_URL:          sw00665268000msb.lc
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 29"}
SUN_DIST:         74.32 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.65d {+05h 34m 35s}  +18.30d {+18d 17' 58"}
MOON_DIST:       104.97 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.88,-34.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      288.41,-67.99 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 199.44,-20.39 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:13:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.748d {+01h 19m 00s} (J2000)
POINT_DEC:       -82.780d {-82d 46' 48"} (J2000)
POINT_ROLL:      221.500d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33006.95 SOD {09:10:06.95} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.782
N_STARS:         52
X_OFFSET:        440 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1399 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00665268000msufc0077.fits
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 30"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.65d {+05h 34m 37s}  +18.30d {+18d 17' 59"}
MOON_DIST:       104.98 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.40,-67.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:13:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.748d {+01h 19m 00s} (J2000)
POINT_DEC:       -82.780d {-82d 46' 48"} (J2000)
POINT_ROLL:      221.500d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33006.95 SOD {09:10:06.95} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.782
N_STARS:         52
X_OFFSET:        440 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1399 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00665268000msufc0077.fits
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 30"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.66d {+05h 34m 38s}  +18.30d {+18d 17' 59"}
MOON_DIST:       104.98 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.40,-67.99 [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 Nov 15 09:14:10 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     665268,   Seg_Num: 0
GRB_RA:           19.4864d {+01h 17m 56.73s} (J2000),
                  19.4588d {+01h 17m 50.12s} (current),
                  19.5934d {+01h 18m 22.41s} (1950)
GRB_DEC:         -82.7708d {-82d 46' 14.8"} (J2000),
                 -82.6873d {-82d 41' 14.3"} (current),
                 -83.0332d {-83d 01' 59.4"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33009.00 SOD {09:10:09.00} UT,   79.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 30"}
SUN_DIST:         74.30 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.66d {+05h 34m 39s}  +18.30d {+18d 17' 60"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.92,-34.31 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.42,-67.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:14:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.748d {+01h 19m 00s} (J2000)
POINT_DEC:       -82.780d {-82d 46' 48"} (J2000)
ROLL:            221.500d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33006.95 SOD {09:10:06.95} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     470308222
X_OFFSET:        0 [pixels]
Y_OFFSET:        175 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       79
Y_GRB_POS:       335
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0093.fits
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 30"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.67d {+05h 34m 40s}  +18.30d {+18d 18' 00"}
MOON_DIST:       104.98 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.40,-67.99 [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 Nov 15 09:14:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.748d {+01h 19m 00s} (J2000)
POINT_DEC:       -82.780d {-82d 46' 48"} (J2000)
ROLL:            221.500d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33006.95 SOD {09:10:06.95} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     470308222
X_OFFSET:        0 [pixels]
Y_OFFSET:        175 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       79
Y_GRB_POS:       335
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0093.fits
SUN_POSTN:       242.84d {+16h 11m 22s}  -21.09d {-21d 05' 30"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.67d {+05h 34m 41s}  +18.30d {+18d 18' 01"}
MOON_DIST:       104.98 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.40,-67.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:19:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 57"} (J2000)
POINT_ROLL:      221.491d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33218.92 SOD {09:13:38.92} UT,   289.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.506
N_STARS:         30
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           959 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00665268000msufc0289.fits
SUN_POSTN:       242.85d {+16h 11m 23s}  -21.09d {-21d 05' 33"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.72d {+05h 34m 53s}  +18.30d {+18d 18' 07"}
MOON_DIST:       104.99 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:20:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 57"} (J2000)
POINT_ROLL:      221.491d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33218.92 SOD {09:13:38.92} UT,   289.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.506
N_STARS:         30
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           959 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00665268000msufc0289.fits
SUN_POSTN:       242.85d {+16h 11m 23s}  -21.09d {-21d 05' 33"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.72d {+05h 34m 54s}  +18.30d {+18d 18' 08"}
MOON_DIST:       104.99 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [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 Nov 15 09:20:21 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     665268,   Seg_Num: 0
GRB_RA:           19.4787d {+01h 17m 54.88s} (J2000),
                  19.4512d {+01h 17m 48.29s} (current),
                  19.5853d {+01h 18m 20.48s} (1950)
GRB_DEC:         -82.7703d {-82d 46' 13.0"} (J2000),
                 -82.6868d {-82d 41' 12.5"} (current),
                 -83.0327d {-83d 01' 57.7"} (1950)
GRB_ERROR:       2.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33009.00 SOD {09:10:09.00} UT,   79.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       242.85d {+16h 11m 23s}  -21.09d {-21d 05' 33"}
SUN_DIST:         74.30 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.73d {+05h 34m 54s}  +18.30d {+18d 18' 08"}
MOON_DIST:       105.01 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.93,-34.31 [deg] galactic lon,lat of the burst
ECL_COORDS:      288.43,-67.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:20:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 57"} (J2000)
ROLL:            221.491d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33218.92 SOD {09:13:38.92} UT,   289.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     470308434
X_OFFSET:        0 [pixels]
Y_OFFSET:        175 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       79
Y_GRB_POS:       335
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0305.fits
SUN_POSTN:       242.85d {+16h 11m 23s}  -21.09d {-21d 05' 33"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.73d {+05h 34m 56s}  +18.30d {+18d 18' 09"}
MOON_DIST:       104.99 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [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 Nov 15 09:21:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 57"} (J2000)
ROLL:            221.491d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33218.92 SOD {09:13:38.92} UT,   289.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     470308434
X_OFFSET:        0 [pixels]
Y_OFFSET:        175 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       79
Y_GRB_POS:       335
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0305.fits
SUN_POSTN:       242.85d {+16h 11m 24s}  -21.09d {-21d 05' 33"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.74d {+05h 34m 57s}  +18.30d {+18d 18' 09"}
MOON_DIST:       104.99 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [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 Nov 15 09:26:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 56"} (J2000)
POINT_ROLL:      221.490d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33796.56 SOD {09:23:16.56} UT,   866.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.810
N_STARS:         130
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00665268000msufc0866.fits
SUN_POSTN:       242.85d {+16h 11m 24s}  -21.09d {-21d 05' 35"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.79d {+05h 35m 09s}  +18.30d {+18d 18' 16"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:26:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 56"} (J2000)
POINT_ROLL:      221.490d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33796.56 SOD {09:23:16.56} UT,   866.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.810
N_STARS:         130
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1439 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00665268000msufc0866.fits
SUN_POSTN:       242.85d {+16h 11m 24s}  -21.09d {-21d 05' 36"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.79d {+05h 35m 09s}  +18.30d {+18d 18' 16"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [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 Nov 15 09:27:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 56"} (J2000)
ROLL:            221.490d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33796.56 SOD {09:23:16.56} UT,   866.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     470309012
X_OFFSET:        559 [pixels]
Y_OFFSET:        559 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       719
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0882.fits
SUN_POSTN:       242.85d {+16h 11m 25s}  -21.09d {-21d 05' 36"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.80d {+05h 35m 12s}  +18.30d {+18d 18' 17"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Nov 15 09:27:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     665268,   Seg_Num: 0
POINT_RA:         19.760d {+01h 19m 02s} (J2000)
POINT_DEC:       -82.783d {-82d 46' 56"} (J2000)
ROLL:            221.490d
IMG_START_DATE:  17353 TJD;   331 DOY;   15/11/27
IMG_START_TIME:  33796.56 SOD {09:23:16.56} UT,   866.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     470309012
X_OFFSET:        559 [pixels]
Y_OFFSET:        559 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       719
BINNING_INDEX:   1
IM_URL:          sw00665268000msuni0882.fits
SUN_POSTN:       242.85d {+16h 11m 25s}  -21.09d {-21d 05' 36"}
SUN_DIST:         74.31 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:       83.80d {+05h 35m 13s}  +18.30d {+18d 18' 18"}
MOON_DIST:       105.00 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      301.89,-34.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      288.39,-67.99 [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 #18643
A. D'Ai (INAF-IASFPA), P. A. Evans (U Leicester), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester), D. M. Palmer (LANL) and T. Sakamoto (AGU) report on behalf of the Swift Team:
At 09:08:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151127A (trigger=665268). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 19.778, -82.774 which is
```
   RA(J2000) = 01h 19m 07s
   Dec(J2000) = -82d 46' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 0.5 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0.15 sec after the trigger.
The XRT began observing the field at 09:10:09.0 UT, 79.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 19.4797, -82.7707 which is equivalent to:
```
   RA(J2000)  = 01h 17m 55.13s
   Dec(J2000) = -82d 46' 14.5"
```
with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 135 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.02 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 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 A. D'Ai (antonino.dai AT ifc.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #18644
D. Xu (NAOC/CAS), D. Malesani (DARK/NBI), Y. Qin (Geneva Observatory), Y.-H. Han (NAOC/CAS, HUST), and Y.-D. Hu (IAA-CSIC) report:
We observed the field of the short GRB 151127A (D'Ai et al., GCN 18643) with the 1-m LCOGT telescope at the Siding Spring Observatory. Observations started 27.42 UT on 2015-11-27 (i.e., 1.04 hr after the GRB), and we obtained 5x180s R-band and 8x180s I-band images.
No new source is detected inside or close to the XRT position (D'Ai et al., GCN 18643), down to 3-sigma upper limits of R > 20 mag and I > 19 mag (calibrated against nearby USNO stars), at mean times of 1.17 and 1.52 hr after the GRB, respectively.
GCN Circular #18645
T. Schweyer and J. Greiner (both MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 151127A (Swift trigger 665268; D'Ai et al., GCN #18643) simultaneously in JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at the ESO La Silla Observatory (Chile).
Observations started at 09:12:30 UT on 2015-11-27, about 4 min after the GRB trigger. They were performed at an average seeing of 2" and at an average airmass of 2.3 during morning twilight, with the Sun at -6 deg. Due to the sky brightness, only the first two 1-min exposure K-band images are useful.
We do not detect a source within the 2.6 arcsecond XRT error circle (D'Ai et al., GCN #18643), down to a limiting magnitude of K(AB) > 16.5 mag.
GCN Circular #18646
XMM-Newton will observe GRB GRB151127A at location (RA=01h 17m 55.13s, DEC=-82d 46' 14.5", J2000), starting at 13:35:45 UT, on November 28, 2015, for an exposure of 17500 seconds.
GCN Circular #18647
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 466 s of XRT Photon Counting mode data and 1 UVOT images for GRB 151127A, 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 = 19.47835, -82.77070 which is equivalent to:
```
RA (J2000): 01h 17m 54.80s
Dec (J2000): -82d 46' 14.5"
```
with an uncertainty of 2.1 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 #18648
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), A. D'Ai (INAF-IASFPA), 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-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 151127A (trigger #665268) (D'Ai, et al., GCN Circ. 18643). The BAT ground-calculated position is RA, Dec = 19.664, -82.762 deg, which is
```
   RA(J2000)  =  01h 18m 39.4s 
   Dec(J2000) = -82d 45' 42.1" 
```
with an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a single spike starting at T_zero and ending at ~T+0.25 sec. T90 (15-350 keV) is 0.19 +- 0.04 sec (estimated error including systematics).
The time-averaged spectrum from T+0.016 to T+0.220 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.33. The fluence in the 15-150 keV band is 2.3 +- 0.6 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band is 0.4 +- 0.1 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/665268/BA/
GCN Circular #18649
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and A. D'Ai report on behalf of the Swift-XRT team:
We have analysed 8.2 ks of XRT data for GRB 151127A (D'Ai et al. GCN Circ. 18643), from 80 s to 18.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 18647).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.15 (+0.17, -0.15).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+0.7, -0.5). The best-fitting absorption column is 1.6 (+1.6, -0.6) x 10^21 cm^-2, consistent with the Galactic value of 1.0 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 2.9 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+1.6, -0.6) x 10^21 cm^-2
Galactic foreground: 1.0 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.3 (+0.7, -0.5)
```
If the light curve continues to decay with a power-law decay index of 1.15, the count rate at T+24 hours will be 1.4 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.2 x 10^-15 (6.4 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00665268.
This circular is an official product of the Swift-XRT team.
GCN Circular #18650
S.W.K Emery (UCL-MSSL) and A. D'Ai (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151127A 77 s after the BAT trigger (D'Ai et al., GCN Circ. 18643). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 18647) 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            77          227          147         >20.8
white               77         1017          295         >21.2
w1                 668         6559          452         >20.3
m2                 816         6354          432         >20.0
w2                 594        18458         1696         >21.3
```
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).
GCN Circular #18656
Y. Kitaoka, T. Sakamoto, A. Yoshida (AGU)
We observed the field of GRB 151127A detected by Swift (trigger #665268; D'Ai et al., GCN Circ. 18643) with the iTelescope.Net (http://www.itelescope.net) T30 (20" Plane Wave) telescope located at the Siding Spring Observatory (New South Wales, Australia). 20 images of 60 sec exposures were taken in the R filter starting from November 27 09:47:56 (UT) about 39.1 minutes after the trigger and stopped on November 27 10:23:18 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the enhanced X-ray afterglow position (Goad et al., GCN Circ. 18647). The estimated five sigma upper limit of the combined image (total exposure of 1200 sec) is ~18.2 using the USNO-B1 catalog.

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Jochen Greiner, last update: 02-Dec-2015 [Disclaimer]