Gamma-ray Burst 160203A

(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:     Wed 03 Feb 16 02:16:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     672525,   Seg_Num: 0
GRB_RA:          161.952d {+10h 47m 48s} (J2000),
                 162.145d {+10h 48m 35s} (current),
                 161.351d {+10h 45m 24s} (1950)
GRB_DEC:         -24.762d {-24d 45' 43"} (J2000),
                 -24.847d {-24d 50' 49"} (current),
                 -24.498d {-24d 29' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       41147 [cnts]    Image_Peak=481 [image_cnts]
TRIGGER_DUR:     16.384 [sec] 
TRIGGER_INDEX:   459     E_range: 15-50 keV
BKG_INTEN:       150348 [cnts]
BKG_TIME:        7888.21 SOD {02:11:28.21} UT
BKG_DUR:         64 [sec]
GRB_DATE:        17421 TJD;    34 DOY;   16/02/03
GRB_TIME:        7990.61 SOD {02:13:10.61} UT
GRB_PHI:         110.14 [deg]
GRB_THETA:        34.85 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.17 [sigma]
IMAGE_SIGNIF:    8.81 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +1  -1  +0  +0 +66  +0 
SUN_POSTN:       316.14d {+21h 04m 33s}  -16.72d {-16d 43' 10"}
SUN_DIST:        131.31 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.25d {+16h 16m 59s}  -16.30d {-16d 18' 03"}
MOON_DIST:        76.25 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.29, 30.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      173.95,-29.75 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 14.63,11.11 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 03 Feb 16 02:16:39 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.964d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.782d {-24d 46' 54"} (J2000)
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8127.89 SOD {02:15:27.89} UT,   137.3 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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 03 Feb 16 02:18:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     672525,   Seg_Num: 0
GRB_RA:          161.952d {+10h 47m 48s} (J2000),
                 162.145d {+10h 48m 35s} (current),
                 161.351d {+10h 45m 24s} (1950)
GRB_DEC:         -24.762d {-24d 45' 43"} (J2000),
                 -24.847d {-24d 50' 49"} (current),
                 -24.498d {-24d 29' 51"} (1950)
GRB_DATE:        17421 TJD;    34 DOY;   16/02/03
GRB_TIME:        7990.61 SOD {02:13:10.61} UT
TRIGGER_INDEX:   459
GRB_PHI:         110.14 [deg]
GRB_THETA:        34.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     16.384 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.17 [sigma]
IMAGE_SIGNIF:    8.81 [sigma]
LC_URL:          sw00672525000msb.lc
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 08"}
SUN_DIST:        131.31 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.27d {+16h 17m 05s}  -16.30d {-16d 18' 16"}
MOON_DIST:        76.27 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.29, 30.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      173.95,-29.75 [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 = 14.63,11.11 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 03 Feb 16 02:19:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.964d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.782d {-24d 46' 55"} (J2000)
POINT_ROLL:      146.145d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8130.05 SOD {02:15:30.05} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.496
N_STARS:         50
X_OFFSET:        309 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1268 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00672525000msufc0139.fits
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 07"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.28d {+16h 17m 07s}  -16.31d {-16d 18' 19"}
MOON_DIST:        76.26 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 03 Feb 16 02:20:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.964d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.782d {-24d 46' 55"} (J2000)
POINT_ROLL:      146.145d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8130.05 SOD {02:15:30.05} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.496
N_STARS:         50
X_OFFSET:        309 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1268 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00672525000msufc0139.fits
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 07"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.28d {+16h 17m 08s}  -16.31d {-16d 18' 22"}
MOON_DIST:        76.27 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:20:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.964d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.782d {-24d 46' 55"} (J2000)
ROLL:            146.145d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8130.05 SOD {02:15:30.05} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     476158545
X_OFFSET:        628 [pixels]
Y_OFFSET:        935 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       788
Y_GRB_POS:       1095
BINNING_INDEX:   1
IM_URL:          sw00672525000msuni0155.fits
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 07"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.28d {+16h 17m 08s}  -16.31d {-16d 18' 23"}
MOON_DIST:        76.27 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:20:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.964d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.782d {-24d 46' 55"} (J2000)
ROLL:            146.145d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8130.05 SOD {02:15:30.05} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     476158545
X_OFFSET:        628 [pixels]
Y_OFFSET:        935 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       788
Y_GRB_POS:       1095
BINNING_INDEX:   1
IM_URL:          sw00672525000msuni0155.fits
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 07"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.29d {+16h 17m 09s}  -16.31d {-16d 18' 25"}
MOON_DIST:        76.27 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:23:09 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     672525,   Seg_Num: 0
GRB_RA:          161.9517d {+10h 47m 48.40s} (J2000),
                 162.1451d {+10h 48m 34.81s} (current),
                 161.3514d {+10h 45m 24.33s} (1950)
GRB_DEC:         -24.7870d {-24d 47' 13.1"} (J2000),
                 -24.8722d {-24d 52' 19.9"} (current),
                 -24.5227d {-24d 31' 21.8"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8137.00 SOD {02:15:37.00} UT,   146.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       316.14d {+21h 04m 34s}  -16.72d {-16d 43' 05"}
SUN_DIST:        131.30 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.31d {+16h 17m 14s}  -16.31d {-16d 18' 35"}
MOON_DIST:        76.30 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.30, 30.14 [deg] galactic lon,lat of the burst
ECL_COORDS:      173.96,-29.77 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 03 Feb 16 02:26:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.963d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.784d {-24d 47' 02"} (J2000)
ROLL:            146.146d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8288.00 SOD {02:18:08.00} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     476158703
X_OFFSET:        628 [pixels]
Y_OFFSET:        935 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       788
Y_GRB_POS:       1095
BINNING_INDEX:   1
IM_URL:          sw00672525000msuni0313.fits
SUN_POSTN:       316.15d {+21h 04m 35s}  -16.72d {-16d 43' 02"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.34d {+16h 17m 21s}  -16.31d {-16d 18' 51"}
MOON_DIST:        76.32 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:25:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.963d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.784d {-24d 47' 02"} (J2000)
POINT_ROLL:      146.146d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8288.00 SOD {02:18:08.00} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.522
N_STARS:         46
X_OFFSET:        69 [pixels]
Y_OFFSET:        376 [pixels]
X_MAX:           1508 [pixels]
Y_MAX:           1815 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00672525000msufc0297.fits
SUN_POSTN:       316.14d {+21h 04m 35s}  -16.72d {-16d 43' 03"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.33d {+16h 17m 19s}  -16.31d {-16d 18' 45"}
MOON_DIST:        76.31 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 03 Feb 16 02:26:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.963d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.784d {-24d 47' 02"} (J2000)
ROLL:            146.146d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8288.00 SOD {02:18:08.00} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     476158703
X_OFFSET:        628 [pixels]
Y_OFFSET:        935 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       788
Y_GRB_POS:       1095
BINNING_INDEX:   1
IM_URL:          sw00672525000msuni0313.fits
SUN_POSTN:       316.15d {+21h 04m 35s}  -16.72d {-16d 43' 02"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.34d {+16h 17m 22s}  -16.31d {-16d 18' 52"}
MOON_DIST:        76.32 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:25:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     672525,   Seg_Num: 0
POINT_RA:        161.963d {+10h 47m 51s} (J2000)
POINT_DEC:       -24.784d {-24d 47' 02"} (J2000)
POINT_ROLL:      146.146d
IMG_START_DATE:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8288.00 SOD {02:18:08.00} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.522
N_STARS:         46
X_OFFSET:        69 [pixels]
Y_OFFSET:        376 [pixels]
X_MAX:           1508 [pixels]
Y_MAX:           1815 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00672525000msufc0297.fits
SUN_POSTN:       316.14d {+21h 04m 35s}  -16.72d {-16d 43' 03"}
SUN_DIST:        131.29 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.33d {+16h 17m 19s}  -16.31d {-16d 18' 46"}
MOON_DIST:        76.31 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.31, 30.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      173.97,-29.76 [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 03 Feb 16 02:30:29 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     672525,   Seg_Num: 0
GRB_RA:          161.9510d {+10h 47m 48.23s} (J2000),
                 162.1444d {+10h 48m 34.65s} (current),
                 161.3507d {+10h 45m 24.17s} (1950)
GRB_DEC:         -24.7886d {-24d 47' 18.9"} (J2000),
                 -24.8738d {-24d 52' 25.7"} (current),
                 -24.5244d {-24d 31' 27.6"} (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:  17421 TJD;    34 DOY;   16/02/03
IMG_START_TIME:  8137.00 SOD {02:15:37.00} UT,   146.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       316.15d {+21h 04m 36s}  -16.72d {-16d 43' 00"}
SUN_DIST:        131.30 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      244.37d {+16h 17m 30s}  -16.32d {-16d 19' 08"}
MOON_DIST:        76.35 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:      270.30, 30.14 [deg] galactic lon,lat of the burst
ECL_COORDS:      173.96,-29.77 [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 1.1% < P(seren) < 2.8%.

GCN Circular #18979
P. D'Avanzo (INAF-OAB), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 02:13:10 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160203A (trigger=672525). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 161.952, -24.762, which is
```
   RA(J2000)  =  10h 47m 48s
   Dec(J2000) = -24d 45' 43"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several overlapping peaks with a duration of about 25 sec. The peak count rate was ~500 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 02:15:27.8 UT, 137.3 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 161.9511, -24.7887 which is equivalent to:
```
   RA(J2000)  = 10h 47m 48.27s
   Dec(J2000) = -24d 47' 19.2"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 96 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 7.41 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 139 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 typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.07.
Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT brera.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 #18980
T. Kruehler (MPE Garching), D. A. Kann (TLS Tautenburg), J. Greiner (MPE Garching), and J. Bolmer (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 160203A (Swift trigger 672525; D'Avanzo et al., GCN #18979) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 02:18:58 UT on 2016-02-03, 6 min after the GRB trigger, and are continuing. They were performed at an average seeing of 1".2 and at an average airmass of 1.8.
We found a single point source within the 2".3 Swift-XRT error circle at
```
RA (J2000.0) = 10:47:48.35
Dec. (J2000.0) = -24:47:19.8
```
with an uncertainty of 0".5 in each coordinate.
Based on the first 4.40 min of total exposures in g'r'i'z' and 4.0 min in JHK at a mid-time of 02:22:14, we estimate preliminary magnitudes (all in AB system) of
```
g' = 18.9 +/- 0.1 mag,
r' = 18.0 +/- 0.1 mag,
i' = 17.7 +/- 0.1 mag,
z' = 17.6 +/- 0.1 mag,
J  = 17.0 +/- 0.1 mag, and
H  = 16.7 +/- 0.1 mag.
```
While we cannot establish fading yet, we propose this source to be the afterglow of GRB 160203A.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.06 mag in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN Circular #18981
D. Xu (NAOC/CAS) reports on behalf of a large collaboration:
We observed the field of GRB 160203A (D'Avanzo et al., GCN 18979) using the LCOGT-1m located at Cerro Tololo. Observations started at 02:35:09 UT on 2016-02-03 (i.e., 1319 s after the BAT trigger) and 10x150s R-band frames were obtained.
We detect an uncatalogued and decaying source at the position reported by Kruehler et al. (GCN 18980), which has m(R)= 18.04 in the first 150s exposure, calibrated with the nearby USNN star, #0651-0249724 (R1=R2=16.84 mag). The fading nature confirms the source is the afterglow of GRB 160203A.
GCN Circular #18982
G. Pugliese (API/UvA), S. Covino (INAF/OAB), T. Kruehler (MPE Garching), D. Xu (NAOC/CAS), N. R. Tanvir (Leicester), report on behalf of a larger collaboration:
We observed the afterglow of GRB 160203A (D'Avanzo et al., GCN 18979; Kruehler et al., GCN 18980; Xu, GCN 18981) with ESO's Very Large Telescope UT2 equipped with X-shooter. Our observations were performed in Rapid Response Mode and started at 02:31:35 UT on 03-02-2016, just about 18 min after the Swift trigger. The X-shooter spectra cover the range between 3000 and 23000 AA, and were obtained at a seeing of around 0.8".
A preliminary analysis of the spectrum shows a clear continuum with absorption features due to Lyman-alpha and various metal lines (SII 1254, SiII 1259/60, OI 1302, SiII 1304, CII 1334, Si IV 1393/1402, SiII 1526, CIV 1548/1550, FeII 1608, AlII 1670) at a common redshift of 3.52, which we propose as the redshift of the GRB. We also detect an intervening system at z=2.203.
We acknowledge the fast and efficient support provided by Paranal staff. In particular we thank Dimitri Gadotti, Boris Haeussler, and Marcela Espinoza for their excellent job.
GCN Circular #18983
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 310 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160203A, 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 = 161.95125, -24.78914 which is equivalent to:
```
RA (J2000): 10h 47m 48.30s
Dec (J2000): -24d 47' 20.9"
```
with an uncertainty of 2.0 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 #18984
A. A. Breeveld (UCL-MSSL) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160203A 151 s after the BAT trigger (D'Avanzo et al., GCN Circ. 18979). A fading source consistent with the optical position (Kruehler et al. GCN Circ. 18980) is detected in the initial UVOT exposures in the white filter.
Preliminary detections and 3-sigma upper limits using the UVOT=20 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           151          301          147         20.56 =B1 0.3
white            10022        10928          885         21.9 =B1 0.3
b                 4946         5146          197        >20.7
u                  309          472          160        >19.5
v                 5562         5762          197        >19.7
uvw1              5972         6171          197        >19.7
uvm2              5766         5966          197        >19.6
uvw2              5357         5557          197        >19.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #18985
Boer, M., Laugier, R. (CNRS-ARTEMIS), Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Gendre B. (UVI - Etelman Obs.), Coward, D. McPherson, D. Williams A., Martin R., Moore J., Dodson R. (UWA) report:
The position of GRB 160203A (d'Avanzo et al., GCNC 18979) was observed with TAROT-Calern (TCA France), TAROT-Chile (TCH), and Zadko (W. Australia). Observing conditions where good for TCH and Zadko, with absorption for TCA. The observations have started at
```
TCH: 2:16:24.7 UT, T0+3m14s
TCA: 2:16:28 UT, T0+ 3m18
Zadko: 13:04:33 UT, T0+10h52m
```
No source has been detected at the position of the reported afterglow (GCNC 18980, 18981, 18982, 18984). R limiting magnitude are 16.3 for TCA, 17.2 for TCH and 19.5 for Zadko. At the time of writing Zadko is still observing the source position.
This notice is citable.
GCN Circular #18986
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), C. Pagani (U. Leicester) and P. D'Avanzo report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 160203A (D'Avanzo et al. GCN Circ. 18979), from 122 s to 33.8 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 18983).
The late-time light curve (from T0+4.9 ks) can be modelled with a power-law decay with a decay index of alpha=1.15 (+0.24, -0.23).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.76 (+0.23, -0.22). The best-fitting absorption column is 1.5 (+2.6, -1.5) x 10^22 cm^-2, at a redshift of 3.52, in addition to the Galactic value of 7.4 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (4.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 7.4 x 10^20 cm^-2
Intrinsic column:    1.5 (+2.6, -1.5) x 10^22 cm^-2 at z=3.52
Photon index:	     1.76 (+0.23, -0.22)
```
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 2.8 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-13 (1.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00672525.
This circular is an official product of the Swift-XRT team.
GCN Circular #18987
A. Trotter, D. Reichart, J. Haislip, J. Moore, N. Frank, M. Maples, E. Johnson, R. Joyner, J. Martin, C. Salemi, J. A. Crain, K. Ivarsen, A. LaCluyze, and M. Nysewander report:
Skynet observed the Swift BAT/XRT localization of GRB 160203A (D'Avanzo et al., GCN 18979, Swift trigger=672525) with with one 16" telescope (P5) and two 24" telescopes (P1 and P8) of the PROMPT array at CTIO, Chile. Starting at 2016-02-03 02:17:18 UT and continuing until 09:26 UT (t=4.1m-7.2h post-trigger), Skynet took a total of 353 exposures ranging from 20-160s. Between t=4.1m and t=61m, both P5 and P8 observed in the I band. Between t=78m and t=7.2h, P1 cycled through the V, R and I filters, while P8 cycled through the B, V and R filters.
We clearly detect an optical afterglow at the position first reported by Kruehler et al. (GCN 18980). The OT exhibits a rising light curve at early times, peaking at I~17 at t~8m, and fades thereafter, with I~20 at t~5h.
A preliminary light curve is at: http://www.skynet.unc.edu/grb/grb160203a.png
Magnitudes are in the Vega System, calibrated to 8 APASS DR9 stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.06 (Schlafly & Finkbeiner 2011).
No further Skynet observations are scheduled.
GCN Circular #18989
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), 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 Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 160203A (D'Avanzo, et al., GCN 18979) 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 2016/02 4.36 to 2016/02 4.55 UTC (30.42 to 34.94 hours after the BAT trigger), obtaining a total of 3.27 hours exposure in the r, i, and z bands.
For a source within the Swift-XRT error circle (Osborne, et al., GCN 18983), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections and upper limit (3-sigma):
```
  r =3D 23.35 +/- 0.21
  i =3D 22.90 +/- 0.13
  z > 20.55
```
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.
GCN Circular #18990
A. Volnova (IKI), E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), A. Pozanenko (IKI) report on behalf of a larger GRB follow-up collaboration:
We observed the field of the Swift GRB 160203A (D'Avanzo et al., GCN 18979) with Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory starting on Feb. 03 (UT) 20:31:45. We obtained several images in R filter. We marginally (S/N ~ 2) detect afterglow (Kruehler et al., GCN 18980) in a combined image. Preliminary photometry of the afterglow is following
```
Date       UT start    t-T0     Filter  Exp.    OT    Err
                        (mid, days)      (s)

2016-02-03 20:31:45    0.80045  R       21*300 23.0   0.5
```
The photometry is based on nearby USNO-B1.0 stars:
```
USNO-B1.0_id   R2
0652-0250834   18.04
0651-0249689   18.51
```
GCN Circular #18998
S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), P. D'Avanzo (INAF-OAB), 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 downlinks, we report further analysis of BAT GRB 160203A (trigger #672525) (D'Avanzo, et al., GCN Circ. 18979). The BAT ground-calculated position is RA, Dec = 161.967, -24.772 deg, which is
```
   RA(J2000)  =  10h 47m 52.2s 
   Dec(J2000) = -24d 46' 17.9" 
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 20%.
The mask-weighted light curve shows a single peak starting at ~T-1 sec, peaking at ~T+13 sec, and ending at ~T+40 sec. T90 (15-350 keV) is 20.2 +- 3.2 sec (estimated error including systematics).
The time-averaged spectrum from T+1.46 to T+25.78 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.93 +- 0.20. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+11.98 sec in the 15-150 keV band is 1.3 +- 0.4 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/672525/BA/
GCN Circular #18999
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.), Coward, D. McPherson, D. Williams A., Martin R., Moore J., Dodson R. (UWA) report:
We analysed the field of GRB 160203A detected by SWIFT (trigger 672525) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 10.9h after the GRB trigger. The elevation of the field increased from 23 degrees above horizon and weather conditions were very good.
The first fast analysis (Boer et al. GCNC 18985) can be now completed by late images. The stack of images shows the afterglow. Measurements:
```
t1(s) t2(s)  Rmag   d_Rmag
44824 48920 22.30   0.50
```
Magnitudes are not corrected for galactic dust extinction.
GCN Circular #19003
Y.Ono, T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano, S. Kurita, 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 160203A (P. D'Avanzo et al., GCN Circular #18979) 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 2016-02-03 15:46:41 UT (~13.5 h after the burst). We did not find any new point source within XRT circle in all three bands.
We obtained following limits for the magnitudes.
```
T0+[hour]    MID-UT     T-EXP[sec]      g'         Rc          Ic
----------------------------------------------------------------------------
   15.98        18:12:04         10080       >21.0     >20.8    >20.1
----------------------------------------------------------------------------
T0+ : Elapsed time after the burst 
T-EXP: Total Exposure time 
We used GSC2.3 catalog for flux calibration.
```
GCN Circular #19007
V. Zach Golkhou (ASU), 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), 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), and Vicki Toy (UMD) report:
We observed the field of GRB 160203A (D'Avanzo, et al., GCN 18979) 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 2016/02 6.28 to 2016/02 6.52 UTC (76.40 to 82.32 hours after the BAT trigger), obtaining a total of 4.27 hours exposure in the r, i, and z bands.
For a source within the Swift-XRT error circle (Osborne, et al., GCN 18983), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
r    >  24.20
i    >  24.14
z   >  19.92
```
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: 10-Feb-2016 [Disclaimer]