Gamma-ray Burst 160127A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 08:43:21 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     671828,   Seg_Num: 0
GRB_RA:          225.956d {+15h 03m 49s} (J2000),
                 226.162d {+15h 04m 39s} (current),
                 225.316d {+15h 01m 16s} (1950)
GRB_DEC:          +0.089d {+00d 05' 20"} (J2000),
                  +0.027d {+00d 01' 37"} (current),
                  +0.284d {+00d 17' 01"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3135 [cnts]    Image_Peak=138 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   139     E_range: 15-50 keV
BKG_INTEN:       20850 [cnts]
BKG_TIME:        31368.24 SOD {08:42:48.24} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17414 TJD;    27 DOY;   16/01/27
GRB_TIME:        31387.31 SOD {08:43:07.31} UT
GRB_PHI:         -109.82 [deg]
GRB_THETA:        32.14 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.13 [sigma]
IMAGE_SIGNIF:    7.70 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +0 -10  +0 
SUN_POSTN:       309.23d {+20h 36m 55s}  -18.56d {-18d 33' 43"}
SUN_DIST:         83.44 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.77d {+11h 03m 04s}   +5.43d {+05d 26' 03"}
MOON_DIST:        60.54 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      223.46, 16.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 245.07,19.02 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 08:44:32 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31465.92 SOD {08:44:25.92} UT,   78.6 [sec] since BAT Trigger Time
COUNTS:          13    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 08:46:37 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     671828,   Seg_Num: 0
GRB_RA:          225.956d {+15h 03m 49s} (J2000),
                 226.162d {+15h 04m 39s} (current),
                 225.316d {+15h 01m 16s} (1950)
GRB_DEC:          +0.089d {+00d 05' 20"} (J2000),
                  +0.027d {+00d 01' 37"} (current),
                  +0.284d {+00d 17' 01"} (1950)
GRB_DATE:        17414 TJD;    27 DOY;   16/01/27
GRB_TIME:        31387.31 SOD {08:43:07.31} UT
TRIGGER_INDEX:   139
GRB_PHI:         -109.82 [deg]
GRB_THETA:        32.14 [deg]
DELTA_TIME:      12.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.13 [sigma]
IMAGE_SIGNIF:    7.70 [sigma]
LC_URL:          sw00671828000msb.lc
SUN_POSTN:       309.23d {+20h 36m 55s}  -18.56d {-18d 33' 41"}
SUN_DIST:         83.44 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.79d {+11h 03m 10s}   +5.43d {+05d 25' 33"}
MOON_DIST:        60.51 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      223.46, 16.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 245.07,19.02 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:00:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
POINT_ROLL:      108.683d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31469.25 SOD {08:44:29.25} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.094
N_STARS:         53
X_OFFSET:        609 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00671828000msufc0081.fits
SUN_POSTN:       309.24d {+20h 36m 58s}  -18.56d {-18d 33' 33"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.90d {+11h 03m 37s}   +5.39d {+05d 23' 29"}
MOON_DIST:        60.39 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.45, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:00:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
POINT_ROLL:      108.683d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31469.25 SOD {08:44:29.25} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.094
N_STARS:         53
X_OFFSET:        609 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00671828000msufc0081.fits
SUN_POSTN:       309.24d {+20h 36m 58s}  -18.56d {-18d 33' 32"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.90d {+11h 03m 37s}   +5.39d {+05d 23' 26"}
MOON_DIST:        60.38 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.45, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:01:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
ROLL:            108.683d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31469.25 SOD {08:44:29.25} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     475577085
X_OFFSET:        928 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00671828000msuni0097.fits
SUN_POSTN:       309.24d {+20h 36m 58s}  -18.56d {-18d 33' 32"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.92d {+11h 03m 40s}   +5.39d {+05d 23' 14"}
MOON_DIST:        60.37 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.45, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:02:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
ROLL:            108.683d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31469.25 SOD {08:44:29.25} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     475577085
X_OFFSET:        928 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00671828000msuni0097.fits
SUN_POSTN:       309.24d {+20h 36m 58s}  -18.56d {-18d 33' 31"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.92d {+11h 03m 41s}   +5.39d {+05d 23' 10"}
MOON_DIST:        60.37 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.45, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:03:01 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     671828,   Seg_Num: 0
GRB_RA:          225.9813d {+15h 03m 55.51s} (J2000),
                 226.1872d {+15h 04m 44.92s} (current),
                 225.3414d {+15h 01m 21.92s} (1950)
GRB_DEC:          +0.0722d {+00d 04' 19.9"} (J2000),
                  +0.0101d {+00d 00' 36.5"} (current),
                  +0.2668d {+00d 16' 00.3"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31592.00 SOD {08:46:32.00} UT,   204.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       309.24d {+20h 36m 58s}  -18.56d {-18d 33' 31"}
SUN_DIST:         83.42 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.93d {+11h 03m 42s}   +5.38d {+05d 23' 02"}
MOON_DIST:        60.40 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.06, 48.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      223.49, 16.69 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:04:17 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     671828,   Seg_Num: 0
GRB_RA:          225.9820d {+15h 03m 55.67s} (J2000),
                 226.1879d {+15h 04m 45.08s} (current),
                 225.3421d {+15h 01m 22.09s} (1950)
GRB_DEC:          +0.0730d {+00d 04' 22.7"} (J2000),
                  +0.0109d {+00d 00' 39.3"} (current),
                  +0.2676d {+00d 16' 03.2"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         18.12 +/- 0.40 [mag]
FILTER:          10, White
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31467.00 SOD {08:44:27.00} UT,   79.7 [sec] since BAT Trigger Time
SUN_POSTN:       309.24d {+20h 36m 59s}  -18.56d {-18d 33' 30"}
SUN_DIST:         83.42 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.94d {+11h 03m 45s}   +5.38d {+05d 22' 50"}
MOON_DIST:        60.39 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.06, 48.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      223.49, 16.69 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:06:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.939d {+15h 03m 45s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 53"} (J2000)
POINT_ROLL:      108.684d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31682.29 SOD {08:48:02.29} UT,   295.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.845
N_STARS:         80
X_OFFSET:        369 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1808 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00671828000msufc0294.fits
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 28"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.96d {+11h 03m 49s}   +5.37d {+05d 22' 28"}
MOON_DIST:        60.33 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.44, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:06:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.939d {+15h 03m 45s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 53"} (J2000)
POINT_ROLL:      108.684d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31682.29 SOD {08:48:02.29} UT,   295.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.845
N_STARS:         80
X_OFFSET:        369 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1808 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00671828000msufc0294.fits
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 28"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.96d {+11h 03m 50s}   +5.37d {+05d 22' 25"}
MOON_DIST:        60.33 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.44, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:07:04 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     671828,   Seg_Num: 0
GRB_RA:          225.9818d {+15h 03m 55.63s} (J2000),
                 226.1877d {+15h 04m 45.04s} (current),
                 225.3419d {+15h 01m 22.04s} (1950)
GRB_DEC:          +0.0727d {+00d 04' 21.7"} (J2000),
                  +0.0106d {+00d 00' 38.3"} (current),
                  +0.2673d {+00d 16' 02.1"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31592.00 SOD {08:46:32.00} UT,   204.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 28"}
SUN_DIST:         83.42 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.96d {+11h 03m 50s}   +5.37d {+05d 22' 24"}
MOON_DIST:        60.37 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.06, 48.24 [deg] galactic lon,lat of the burst
ECL_COORDS:      223.49, 16.69 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:08:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.939d {+15h 03m 45s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 52"} (J2000)
POINT_ROLL:      108.684d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  32262.56 SOD {08:57:42.56} UT,   875.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.171
N_STARS:         106
X_OFFSET:        369 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1808 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00671828000msufc0875.fits
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 27"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.97d {+11h 03m 53s}   +5.37d {+05d 22' 11"}
MOON_DIST:        60.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.44, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:08:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.939d {+15h 03m 45s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 52"} (J2000)
POINT_ROLL:      108.684d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  32262.56 SOD {08:57:42.56} UT,   875.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.171
N_STARS:         106
X_OFFSET:        369 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1808 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00671828000msufc0875.fits
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 27"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.97d {+11h 03m 53s}   +5.37d {+05d 22' 10"}
MOON_DIST:        60.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.44, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 27 Jan 16 09:08:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     671828,   Seg_Num: 0
POINT_RA:        225.942d {+15h 03m 46s} (J2000)
POINT_DEC:        +0.098d {+00d 05' 54"} (J2000)
ROLL:            108.683d
IMG_START_DATE:  17414 TJD;    27 DOY;   16/01/27
IMG_START_TIME:  31469.25 SOD {08:44:29.25} UT,   81.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     475577085
X_OFFSET:        928 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1088
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00671828000msuni0097.fits
SUN_POSTN:       309.25d {+20h 36m 59s}  -18.56d {-18d 33' 27"}
SUN_DIST:         83.47 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      165.97d {+11h 03m 54s}   +5.37d {+05d 22' 08"}
MOON_DIST:        60.31 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:      358.05, 48.29 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      223.45, 16.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #18938
A. Amaral-Rogers (U Leicester), A. P. Beardmore (U Leicester), P.A. Evans (U Leicester), A. Y. Lien (GSFC/UMBC), P. T. O'Brien (U Leicester), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 08:43:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160127A (trigger=671828). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 225.956, +0.089 which is
```
   RA(J2000) = 15h 03m 49s
   Dec(J2000) = +00d 05' 20"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 20 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 08:44:25.9 UT, 78.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 225.98136, 0.07222 which is equivalent to:
```
   RA(J2000)  = 15h 03m 55.53s
   Dec(J2000) = +00d 04' 20.0"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 109 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 5.71 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 81 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at
```
  RA(J2000)  =	15:03:55.70 = 225.98209
  DEC(J2000) = +00:04:23.0  =	0.07305
```
with a 90%-confidence error radius of about 1.10 arc sec. This position is 3.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.13. No correction has been made for the expected extinction corresponding to E(B-V) of 0.06.
Burst Advocate for this burst is A. Amaral-Rogers (aar14 AT le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #18939
Klotz A., Turpin D. (IRAP-CNRS-OMP), Boer M., Gendre B., Bardho O. (UNS-CNRS-OCA), Gendre B. (Etelman Observatory-UVI), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 160127A detected by SWIFT (trigger 671828) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 25.1s after the GRB trigger (13.4s after the notice). The elevation of the field increased from 42 degrees above horizon and weather conditions were good.
We detected the candidate couterpart mentioned by Amaral-Rogers et al. (GCNC 18938).
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We detect the OT increasing its optical flux from t0+25s to t0+45s (R~16.9) and fading until the end of the trail at t0+85s.
Following images were acquired in tracking mode:
```
t1(s) t2(s)  Rmag   d_Rmag
   99  129    17.9    0.6
  141  171    17.4    0.1
  182  212    17.1    0.7
  223  253    17.1    0.0
  306  396    17.1    0.2
  407  497    17.4    0.4
  610  700    17.6    0.1
  711  801    17.6    0.2
  914 1004    17.6    0.1
1015 1105    17.4    0.0
1742 1922   >18.4    0.6
```
Magnitudes were estimated with the stars:
```
NOMAD1 0900-0248256 ra=225.9885561 dec=+00.0840197 R=14.83
NOMAD2 0901-0246538 ra=225.9533572 dec=+00.1320336 R=14.83
```
Magnitudes are not corrected for galactic dust extinction.
After the first deacay observed in the trailed image from t0+45s to t0+85s, we observed a bump (maximum flux at t0+220s R~17.1) and we suspect a second bump (maximum flux at t0+1100s R~17.3) followed by a steep decay. The OT become fainter than 18.4 after t0+2000s.
GCN Circular #18940
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1815 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160127A, 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 = 225.98206, +0.07291 which is equivalent to:
```
RA (J2000): 15h 03m 55.69s
Dec (J2000): +00d 04' 22.5"
```
with an uncertainty of 1.7 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 #18941
Antonino Cucchiara (GSFC/STScI), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=C3=A9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=C3=BAs Gonz=C3=A1lez (UNAM), Carlos Rom=C3=A1n-Z=C3=BA=C3=B1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 160127A (Amaral-Rogers et al., GCN 18938) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=C3=B3mico Nacional on Sierra San Pedro M=C3=A1rtir from 2016/01 27.39 to 2016/01 27.55 UTC (0.73 to 4.43 hours after the BAT trigger), obtaining a total of 2.68 hours exposure in the r,i and z bands.
We detect the optical counterpart at
RA, Dec =3D 15:3:55.77, +00:04:22.4 (J2000, +/-0.5=E2=80=9D).
In comparison with the SDSS DR9, we obtain the following magnitudes:
```
 r	20.64 +/- 0.03
 i	20.66 +/- 0.03
 z	20.14 +/- 0.32
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
Further observations are planned.
We thank the staff of the Observatorio Astron=C3=B3mico Nacional in San Pedro M=C3=A1rtir.
GCN Circular #18943
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), D.N. Burrows (PSU) and A. Amaral-Rogers report on behalf of the Swift-XRT team:
We have analysed 6.9 ks of XRT data for GRB 160127A (Amaral-Rogers et al. GCN Circ. 18938), from 65 s to 19.1 ks after the BAT trigger. The data comprise 121 s in Windowed Timing (WT) mode (the first 5 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 18940).
The late-time light curve (from T0+6.0 ks) can be modelled with a power-law decay with a decay index of alpha=1.6 (+/-0.3).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.65 (+0.23, -0.21). The best-fitting absorption column is 1.7 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 5.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.85 (+/-0.15) and a best-fitting absorption column of 9.7 (+4.4, -3.9) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     9.7 (+4.4, -3.9) x 10^20 cm^-2
Galactic foreground: 5.7 x 10^20 cm^-2
Excess significance: 1.7 sigma
Photon index:	     1.85 (+/-0.15)
```
If the light curve continues to decay with a power-law decay index of 1.6, the count rate at T+24 hours will be 1.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.2 x 10^-14 (7.3 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00671828.
This circular is an official product of the Swift-XRT team.
GCN Circular #18944
S. D. Barthelmy (GSFC), A. Amaral-Rogers (U Leicester), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160127A (trigger #671828) (Amaral-Rogers et al., GCN Circ. 18938). The BAT ground-calculated position is RA, Dec = 225.966, 0.080 deg which is
```
  RA(J2000)  =  15h 03m 51.8s
  Dec(J2000) = +00d 04' 46.7"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%.
The mask-weighted light curve shows a double-peaked structure that starts at ~ T-1 s and ends at ~ T+6 s. The two peaks occur at ~ T+1 and ~T+3 s, respectively. T90 (15-350 keV) is 6.16 +- 0.94 sec (estimated error including systematics).
The time-averaged spectrum from T-1.44 to T+5.70 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.99 +- 1.11, and Epeak of 25.6 +- 0.0 keV (chi squared 44.15 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.3 +- 0.5 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+3.34 sec in the 15-150 keV band is 1.4 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.43 +- 0.23 (chi squared 50.23 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/671828/BA/

GCN Circular #18945
M. H. Siegel (PSU) and Amaral-Rogers (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160127A 82 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 18938). A fading source consistent with the XRT position (Evans et al. GCN Circ. 18940) is detected in the initial UVOT exposures.
The preliminary UVOT position is:

   RA  (J2000) =  15:03:55.76 = 225.98234 (deg.)
   Dec (J2000) = +00:04:22.5  =   0.07291 (deg.)

with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white (fc)          82          232          147         17.59 +/- 0.04
white              574         2411          342         18.66 +/- 0.08
white             6837         7037          196         20.85 +/- 0.28
v                  624         1942          156         18.46 +/- 0.19
b                  550         1174           58         18.58 +/- 0.16
u (fc)             295          545          246         17.25 +/- 0.05
u                  698         2362          174         18.31 +/- 0.13
u                 6427        19117         1004         20.92 +/- 0.31
w1                 674         1124           58         17.87 +/- 0.20
m2                 824         1966          117         19.07 +/- 0.32
w2                 600         1917          136         19.56 +/- 0.32

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #18946
D. Xu (NAOC/CAS), Y.-H. Han (NAOC/CAS, HUST), Y.-D. Hu (IAA-CSIC), Y. Qing (Geneva Observatory) report on behalf of a larger collaboration:
We observed the field of GRB 160127A (Amaral-Rogers et al., GCN 18938) using the LCOGT-1m located at the Sutherland, South Africa. Observations started at 01:14:53 UT on 2016-01-28 (i.e., 16.53 hr after the burst) and a series of 120s Sloan r-band frames were obtained.
The previously reported afterglow (Amaral-Rogers et al., GCN 18938; Klotz et al., GCN 18939; Cucchiara et al., GCN 18941) is not detected in our stacked image, down to a limiting magnitude of m(r) ~20.5, calibrated with the SDSS field.
GCN Circular #18947
K. D. Alexander (Harvard), T. Laskar (NRAO / UC Berkeley), and E. Berger (Harvard) report on behalf of a larger collaboration:
We observed GRB 160127A (Amaral-Rogers et al., GCN 18938) at multiple frequencies with the Karl G. Jansky Very Large Array (VLA) beginning 2016 January 28.46 UT (1.09 days after the burst). At a mean frequency of 21.8 GHz, we detect a radio source with a preliminary flux density of ~70 uJy at
```
RA = 15:03:55.773 +/- 0.013
Dec = +00:04:22.07 +/- 0.17
```
consistent with the enhanced Swift/XRT position (Evans et al., GCN 18940) and the optical position (Cucchiara et al., GCN 18941; Siegel & Amaral-Rogers, GCN 18945). Follow-up observations are planned.
We thank the VLA staff for rapidly executing these observations.
GCN Circular #18948
Y.Saito, T.Fujiwara, T. Yoshii, Y. Tano, Y. Tachibana, Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 160127A (A. Amaral-Rogers et al., GCN Circular #18938) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2016-01-27 17:04:39 UT (~8.4 h after the burst). We did not find previously reported afterglow (A. Amaral-Rogers et al., GCN Circular #18938; A. Klotz et al., GCN Circular #18939; A. Cucchiara et al., GCN Circular #18941) in all three bands.
We obtained following limits for the magnitudes.
```
T0+[hour]    MID-UT      T-EXP[sec]   g'          Rc          Ic
-----------------------------------------------------------------------------
10.19        18:54:38      11700      > 20.7     > 20.4     > 19.2
-----------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
```
GCN Circular #18949
E. Mazaeva (IKI), S. Schmalz (AIP), A. Volnova (IKI), N. Tungalag (Research Center of Astronomy and Geophysics MAS), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 160127A (Amaral-Rogers et al., GCN 18938) with ORI-40 telescope of Khureltogot observatory starting on Jan., 27 (UT) 19:32:48. We marginally detect optical afterglow (Amaral-Rogers et al., GCN 18938; Klotz et al., GCN 18939; Cucchiara et al., GCN 18941). Preliminary photometry of the afterglow is following
```
Date UT start       t-T0   Filter Exp.   OT   Err   UL(3sigma)
                     (mid, days)   (s)

2016-01-27 19:32:48 0.48499 none  90*60 21.0  0.35  21.0
2016-01-27 21:10:18 0.55333 none  89*60 n/d   n/d   21.2
```
Photometry is based on nearby SDSS stars, R magnitude deduced from Lupton's transformations.
```
SDSS_DR9_id         R(Lupton)
J150358.16+000929.4 16.36
J150406.02+000738.4 16.03
J150341.40+000835.8 15.17
J150334.55+000806.9 16.20
J150334.11+000513.3 17.32
```
GCN Circular #18950
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach=20 Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 160127A (Amaral-Rogers et al., GCN Circular 18938) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2016/01 29.43 to 2016/01 29.55 UTC (49.72 to 52.43 hours after the BAT trigger), obtaining a total of 1.48 hours exposure in the r, i, and z bands.
We no longer detect the optical counterpart reported by Amaral-Rogers et al. (GCN Circular 18938), Klotz et al. (GCN Circular 18939), Cucchiara et al. (GCN Circular 18941), and Siegel et al. (GCN Circular 18945). In comparison with the SDSS DR9 catalog, we obtain the following 3-sigma upper limits:
```
 r	> 23.15
 i	> 23.09
 z	> 20.00
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.

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Jochen Greiner, last update: 29-Jan-2016 [Disclaimer]