Gamma-ray Burst 150203A

(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:     Tue 03 Feb 15 04:09:33 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.415d {+06h 33m 39s} (J2000),
                  98.618d {+06h 34m 28s} (current),
                  97.740d {+06h 30m 58s} (1950)
GRB_DEC:          +6.968d {+06d 58' 04"} (J2000),
                  +6.955d {+06d 57' 19"} (current),
                  +7.007d {+07d 00' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4534 [cnts]    Image_Peak=191 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       28496 [cnts]
BKG_TIME:        14930.86 SOD {04:08:50.86} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17056 TJD;    34 DOY;   15/02/03
GRB_TIME:        14947.50 SOD {04:09:07.50} UT
GRB_PHI:         148.52 [deg]
GRB_THETA:        20.73 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +1 +78  +0 
SUN_POSTN:       316.46d {+21h 05m 51s}  -16.63d {-16d 37' 33"}
SUN_DIST:        141.79 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.37d {+08h 25m 28s}  +14.50d {+14d 29' 59"}
MOON_DIST:        28.26 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       98.70,-16.22 [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 = 204.16,-4.88 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=444629353).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:09:48 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     444629353
GRB_RA:           99.700d {+06h 38m 48s} (J2000),
                  99.897d {+06h 39m 35s} (current),
                  99.046d {+06h 36m 11s} (1950)
GRB_DEC:          +2.820d {+02d 49' 12"} (J2000),
                  +2.806d {+02d 48' 21"} (current),
                  +2.865d {+02d 51' 55"} (1950)
GRB_ERROR:       13.26 [deg radius, statistical only]
DATA_SIGNIF:     5.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17056 TJD;    34 DOY;   15/02/03
GRB_TIME:        14950.06 SOD {04:09:10.06} UT
GRB_PHI:         215.00 [deg]
GRB_THETA:       102.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       316.46d {+21h 05m 51s}  -16.63d {-16d 37' 33"}
SUN_DIST:        141.51 [deg]   Sun_angle= -9.6 [hr] (East of Sun)
MOON_POSTN:      126.37d {+08h 25m 29s}  +14.50d {+14d 29' 57"}
MOON_DIST:        28.62 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      208.98, -1.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      100.33,-20.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150203173/quicklook/glg_lc_medres34_bn150203173.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=629578).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:09:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     444629353
GRB_RA:           96.900d {+06h 27m 36s} (J2000),
                  97.103d {+06h 28m 25s} (current),
                  96.226d {+06h 24m 54s} (1950)
GRB_DEC:          +6.867d {+06d 52' 00"} (J2000),
                  +6.856d {+06d 51' 23"} (current),
                  +6.899d {+06d 53' 55"} (1950)
GRB_ERROR:       29.35 [deg radius, statistical plus systematic]
GRB_INTEN:       53 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17056 TJD;    34 DOY;   15/02/03
GRB_TIME:        14950.06 SOD {04:09:10.06} UT
GRB_PHI:         219.00 [deg]
GRB_THETA:       105.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.73
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      63%  GRB
2nd_MOST_LIKELY:  33%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       316.46d {+21h 05m 51s}  -16.63d {-16d 37' 33"}
SUN_DIST:        140.33 [deg]   Sun_angle= -9.4 [hr] (East of Sun)
MOON_POSTN:      126.37d {+08h 25m 29s}  +14.50d {+14d 29' 58"}
MOON_DIST:        29.72 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.10, -2.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       97.14,-16.40 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150203173/quicklook/glg_lc_medres34_bn150203173.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 172.38,-22.97 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=629578).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:10:55 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.3990d {+06h 33m 35.76s} (J2000),
                  98.6025d {+06h 34m 24.59s} (current),
                  97.7248d {+06h 30m 53.94s} (1950)
GRB_DEC:          +6.9538d {+06d 57' 13.6"} (J2000),
                  +6.9414d {+06d 56' 28.9"} (current),
                  +6.9928d {+06d 59' 34.2"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.31e-09 [erg/cm2/sec]
GRB_SIGNIF:      6.85 [sigma]
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15021.55 SOD {04:10:21.55} UT,   74.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.17 261.79 243.38
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.63d {-16d 37' 32"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.38d {+08h 25m 31s}  +14.50d {+14d 29' 51"}
MOON_DIST:        28.29 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.77 [deg] galactic lon,lat of the burst
ECL_COORDS:       98.69,-16.23 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.25 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:11:06 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.3990d {+06h 33m 35.7s} (J2000),
                  98.6025d {+06h 34m 24.5s} (current),
                  97.7248d {+06h 30m 53.9s} (1950)
GRB_DEC:          +6.9538d {+06d 57' 13.6"} (J2000),
                  +6.9414d {+06d 56' 28.9"} (current),
                  +6.9928d {+06d 59' 34.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       47 [cnts]
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15021.55 SOD {04:10:21.55} UT,   74.0 [sec] since BAT Trigger Time
CENTROID_X:      298.79,  raw= 299  [pixels]
CENTROID_Y:      319.49,  raw= 319  [pixels]
ROLL:            251.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   51.14
GRB_POS_XRT_Z:   -15.33
IMAGE_URL:       sw00629578000msxps_rw.img
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.63d {-16d 37' 32"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.38d {+08h 25m 31s}  +14.50d {+14d 29' 50"}
MOON_DIST:        28.29 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.77 [deg] galactic lon,lat of the burst
ECL_COORDS:       98.69,-16.23 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:11:14 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.3990d {+06h 33m 35.7s} (J2000),
                  98.6025d {+06h 34m 24.5s} (current),
                  97.7248d {+06h 30m 53.9s} (1950)
GRB_DEC:          +6.9538d {+06d 57' 13.6"} (J2000),
                  +6.9414d {+06d 56' 28.9"} (current),
                  +6.9928d {+06d 59' 34.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       47 [cnts]
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15021.55 SOD {04:10:21.55} UT,   74.0 [sec] since BAT Trigger Time
CENTROID_X:      298.79,  raw= 299  [pixels]
CENTROID_Y:      319.49,  raw= 319  [pixels]
ROLL:            251.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   51.14
GRB_POS_XRT_Z:   -15.33
IMAGE_URL:       sw00629578000msxps_rw.img
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.63d {-16d 37' 32"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.38d {+08h 25m 32s}  +14.50d {+14d 29' 49"}
MOON_DIST:        28.29 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.77 [deg] galactic lon,lat of the burst
ECL_COORDS:       98.69,-16.23 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:13:14 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.415d {+06h 33m 39s} (J2000),
                  98.618d {+06h 34m 28s} (current),
                  97.740d {+06h 30m 58s} (1950)
GRB_DEC:          +6.968d {+06d 58' 04"} (J2000),
                  +6.955d {+06d 57' 19"} (current),
                  +7.007d {+07d 00' 25"} (1950)
GRB_DATE:        17056 TJD;    34 DOY;   15/02/03
GRB_TIME:        14947.50 SOD {04:09:07.50} UT
TRIGGER_INDEX:   146
GRB_PHI:         148.52 [deg]
GRB_THETA:        20.73 [deg]
DELTA_TIME:      -63.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.85 [sigma]
IMAGE_SIGNIF:    7.19 [sigma]
LC_URL:          sw00629578000msb.lc
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.63d {-16d 37' 30"}
SUN_DIST:        141.79 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.40d {+08h 25m 36s}  +14.49d {+14d 29' 37"}
MOON_DIST:        28.29 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       98.70,-16.22 [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 = 204.16,-4.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:14:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.399d {+06h 33m 36s} (J2000)
POINT_DEC:        +6.968d {+06d 58' 05"} (J2000)
POINT_ROLL:      251.926d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15030.19 SOD {04:10:30.19} UT,   82.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.379
N_STARS:         190
X_OFFSET:        360 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1319 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00629578000msufc0082.fits
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.63d {-16d 37' 29"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.41d {+08h 25m 38s}  +14.49d {+14d 29' 30"}
MOON_DIST:        28.31 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:14:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.399d {+06h 33m 36s} (J2000)
POINT_DEC:        +6.968d {+06d 58' 05"} (J2000)
POINT_ROLL:      251.926d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15030.19 SOD {04:10:30.19} UT,   82.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.379
N_STARS:         190
X_OFFSET:        360 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1319 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00629578000msufc0082.fits
SUN_POSTN:       316.47d {+21h 05m 52s}  -16.62d {-16d 37' 29"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.41d {+08h 25m 39s}  +14.49d {+14d 29' 27"}
MOON_DIST:        28.31 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:16:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.399d {+06h 33m 36s} (J2000)
POINT_DEC:        +6.968d {+06d 58' 05"} (J2000)
ROLL:            251.926d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15030.19 SOD {04:10:30.19} UT,   82.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444629443
X_OFFSET:        764 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       924
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0096.fits
SUN_POSTN:       316.47d {+21h 05m 53s}  -16.62d {-16d 37' 28"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.42d {+08h 25m 42s}  +14.49d {+14d 29' 19"}
MOON_DIST:        28.33 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:16:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.399d {+06h 33m 36s} (J2000)
POINT_DEC:        +6.968d {+06d 58' 05"} (J2000)
ROLL:            251.926d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15030.19 SOD {04:10:30.19} UT,   82.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444629443
X_OFFSET:        764 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       924
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0096.fits
SUN_POSTN:       316.47d {+21h 05m 53s}  -16.62d {-16d 37' 28"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.43d {+08h 25m 42s}  +14.49d {+14d 29' 17"}
MOON_DIST:        28.33 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:21:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
POINT_ROLL:      251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15242.35 SOD {04:14:02.35} UT,   294.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.106
N_STARS:         169
X_OFFSET:        444 [pixels]
Y_OFFSET:        438 [pixels]
X_MAX:           1403 [pixels]
Y_MAX:           1397 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00629578000msufc0294.fits
SUN_POSTN:       316.47d {+21h 05m 53s}  -16.62d {-16d 37' 24"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.47d {+08h 25m 52s}  +14.48d {+14d 28' 47"}
MOON_DIST:        28.37 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:21:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
POINT_ROLL:      251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15242.35 SOD {04:14:02.35} UT,   294.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.106
N_STARS:         169
X_OFFSET:        444 [pixels]
Y_OFFSET:        438 [pixels]
X_MAX:           1403 [pixels]
Y_MAX:           1397 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00629578000msufc0294.fits
SUN_POSTN:       316.47d {+21h 05m 53s}  -16.62d {-16d 37' 24"}
SUN_DIST:        141.77 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.47d {+08h 25m 53s}  +14.48d {+14d 28' 45"}
MOON_DIST:        28.37 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:22:46 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
ROLL:            251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15242.35 SOD {04:14:02.35} UT,   294.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444629655
X_OFFSET:        764 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       924
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0308.fits
SUN_POSTN:       316.47d {+21h 05m 54s}  -16.62d {-16d 37' 23"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.48d {+08h 25m 55s}  +14.48d {+14d 28' 39"}
MOON_DIST:        28.38 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:22:27 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     629578,   Seg_Num: 0
GRB_RA:           98.3996d {+06h 33m 35.90s} (J2000),
                  98.6031d {+06h 34m 24.73s} (current),
                  97.7254d {+06h 30m 54.08s} (1950)
GRB_DEC:          +6.9532d {+06d 57' 11.5"} (J2000),
                  +6.9408d {+06d 56' 26.8"} (current),
                  +6.9922d {+06d 59' 32.0"} (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:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15106.00 SOD {04:11:46.00} UT,   158.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       316.47d {+21h 05m 54s}  -16.62d {-16d 37' 23"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.48d {+08h 25m 55s}  +14.48d {+14d 28' 41"}
MOON_DIST:        28.38 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.71, -0.77 [deg] galactic lon,lat of the burst
ECL_COORDS:       98.69,-16.23 [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:     Tue 03 Feb 15 04:23:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
ROLL:            251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15242.35 SOD {04:14:02.35} UT,   294.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444629655
X_OFFSET:        764 [pixels]
Y_OFFSET:        758 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       924
Y_GRB_POS:       918
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0308.fits
SUN_POSTN:       316.47d {+21h 05m 54s}  -16.62d {-16d 37' 23"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.48d {+08h 25m 56s}  +14.48d {+14d 28' 37"}
MOON_DIST:        28.38 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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 Circular #17377
T. N. Ukwatta (LANL), W. H. Baumgartner (GSFC/UMBC), M. M. Chester (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 04:09:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150203A (trigger=629578). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 98.415, +6.968 which is
```
   RA(J2000) = 06h 33m 39s
   Dec(J2000) = +06d 58' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 04:10:21.5 UT, 74.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 98.3997, 6.9533 which is equivalent to:
```
   RA(J2000)  = 06h 33m 35.92s
   Dec(J2000) = +06d 57' 11.9"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 76 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 6.52 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 1.31e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 82 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain extinction expected.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:26:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
POINT_ROLL:      251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15820.46 SOD {04:23:40.46} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.259
N_STARS:         190
X_OFFSET:        204 [pixels]
Y_OFFSET:        198 [pixels]
X_MAX:           1643 [pixels]
Y_MAX:           1637 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00629578000msufc0872.fits
SUN_POSTN:       316.48d {+21h 05m 54s}  -16.62d {-16d 37' 20"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.51d {+08h 26m 04s}  +14.47d {+14d 28' 14"}
MOON_DIST:        28.41 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:27:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
POINT_ROLL:      251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15820.46 SOD {04:23:40.46} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.259
N_STARS:         190
X_OFFSET:        204 [pixels]
Y_OFFSET:        198 [pixels]
X_MAX:           1643 [pixels]
Y_MAX:           1637 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00629578000msufc0872.fits
SUN_POSTN:       316.48d {+21h 05m 54s}  -16.62d {-16d 37' 20"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.52d {+08h 26m 04s}  +14.47d {+14d 28' 12"}
MOON_DIST:        28.41 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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:     Tue 03 Feb 15 04:28:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
ROLL:            251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15820.46 SOD {04:23:40.46} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444630233
X_OFFSET:        763 [pixels]
Y_OFFSET:        757 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       923
Y_GRB_POS:       917
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0886.fits
SUN_POSTN:       316.48d {+21h 05m 55s}  -16.62d {-16d 37' 19"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.53d {+08h 26m 07s}  +14.47d {+14d 28' 04"}
MOON_DIST:        28.42 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Feb 15 04:28:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629578,   Seg_Num: 0
POINT_RA:         98.398d {+06h 33m 35s} (J2000)
POINT_DEC:        +6.971d {+06d 58' 14"} (J2000)
ROLL:            251.927d
IMG_START_DATE:  17056 TJD;    34 DOY;   15/02/03
IMG_START_TIME:  15820.46 SOD {04:23:40.46} UT,   873.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444630233
X_OFFSET:        763 [pixels]
Y_OFFSET:        757 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       923
Y_GRB_POS:       917
BINNING_INDEX:   1
IM_URL:          sw00629578000msuni0886.fits
SUN_POSTN:       316.48d {+21h 05m 55s}  -16.62d {-16d 37' 19"}
SUN_DIST:        141.76 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      126.53d {+08h 26m 08s}  +14.47d {+14d 28' 02"}
MOON_DIST:        28.42 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      204.70, -0.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.68,-16.22 [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.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN Circular #17378
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 150203A, we find an enhanced XRT position of the afterglow: RA, Dec: 98.3993, 6.9532 which is equivalent to:
```
   RA (J2000)  = 06 33 35.84
   Dec (J2000) = +06 57 11.5
```
with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/629578.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #17379
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 150203A (Ukwatta et al., GCN 17377) starting at 04:10:55 UT, 108 s after the burst, with thin cloud condition. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. We do not detect any new source neither in our single images, nor in the co-add of the first 5 images, within the enhanced XRT error (Evans, GCN 17378). The typical limiting magnitude of our single clear image is about 17.8 calibrated to USNO B1.0.
GCN Circular #17380
D. A. Perley (Caltech) reports on behalf of a larger collaboration:
The Palomar 60-inch robotic telescope responded to the Swift alert for GRB 150203A (Ukwatta et al., GCN 17377) and began automatic follow-up at 04:11:42 UT, 155 s after the BAT trigger. The telescope acquired a series of cycling 60-second r, i, and z exposures under good seeing conditions.
We detect no source in or near the XRT position (Evans et al., GCN 17378), in any individual exposure or in a stack of the first several minutes of imaging acquired in each filter. An approximate limiting magnitude of the r-band stack (7 minutes of imaging at a median time of 13.0 minutes post-trigger) is >21.5 mag, calibrated relative to USNO B1.0.
Given the low galactic latitude, no further follow-up is planned.
GCN Circular #17383
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), 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), and Harvey Moseley (GSFC) report:
We observed the field of GRB 150203A (Ukwatta, et al., GCN 17377) 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 2015/02 3.19 to 2015/02 3.26 UTC (0.50 to 2.14 hours after the BAT trigger), obtaining a total of 1.28 hours exposure in the r, i, and z bands.
We find no uncatalogued sources within the Swift-XRT error circle (Evans, et al., GCN 17378). In comparison with USNO-B1 and 2MASS, we obtain the following upper limits (3-sigma):
```
  r > 23.1
  i > 23.3
  z > 20.1
```
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 #17384
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1115 s of XRT Photon Counting mode data and 2 UVOT images for GRB 150203A, 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 = 98.39900, +6.95372 which is equivalent to:
```
RA (J2000): 06h 33m 35.76s
Dec (J2000): +06d 57' 13.4"
```
with an uncertainty of 1.9 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 #17386
C. Delvaux, K. Varela and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 150203A (SWIFT-629578; Ukwatta et al., GCN #17377) 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 on February 3rd, 2015, at 04:20 UT, 11 minutes after the GRB trigger. They were performed at an average seeing of 1.2" and at an average airmass of 2.1. The distance from the moon was only 28 deg.
We do not detect a source inside the 2.1 arcsec error circle reported by Ukwatta et al. (GCN #17377). Based on a total exposure of 0.83 hours in g'r'i'z' and 0.80 hours in JHK, at a midtime of 0.7 hour after the burst, we measure the following preliminary upper limits (AB magnitudes system):
```
g' > 23.5 mag,
r' > 23.9 mag,
i' > 24.0 mag,
z' > 24.1 mag,
J > 21.5 mag,
H > 20.9 mag, and
K > 18.6 mag.
```
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) = 0.88 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17387
Klotz A., Turpin D. (IRAP-CNRS-OMP), Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 150203A detected by SWIFT (trigger 629578) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 37.1s after the GRB trigger (13.6s after the notice). The elevation of the field decreased from 45 degrees above horizon and weather conditions were good but the field of view is located at low galactic latitude (extinction estimated > 14 magnitudes in the R band).
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT with a limiting magnitude of: t0+37.1s to t0+97.1s : Rlim = 15.8
The second image is 90.0s exposure in tracking mode: t0+391s to t0+481s : Rlim = 16.4
We co-added a series of exposures: t0+391s to t0+1203s : Rlim = 17.0
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=204.7072 lat= -0.7535
GCN Circular #17389
V. Pelassa (UAH) and H.-F. Yu (MPE) report on behalf of the Fermi GBM Team:
"At 04:09:10.06 UT on 03 Feb 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150203A (trigger 444629353 / 150203173), which was also detected by Swift (Ukwatta et al. 2015, GCN 17377). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 97 degrees.
The GBM light curve shows a single pulse with a duration (T90) of about 26 s (50-300 keV). The time-averaged spectrum from T0-2.048 s to T0+ 27.648 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.82 +/- 0.32 and the cutoff energy, parameterized as Epeak, is 59 +/- 8 keV.
The event fluence (10-1000 keV) in this time interval is (1.29 +/- 0.13)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+13.952 s in the 10-1000 keV band is 1.8 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #17391
P. D'Avanzo, S. Covino (INAF-OAB), V. D'Elia (ASI/ASDC & INAF/OAR) report on behalf of the REM team:
We observed the field of GRB 150203A (Ukwatta et al., GCN 17377) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile). The observations started at 04:10:09 UT, 62 seconds after the GRB, and were carried out simultaneously with in the g, r, i, z and H bands.
No source is detected at the X-ray afterglow position reported by Evans et al. (GCN 17384). At a mean t-t0 of 181 s, we obtain the following 3sigma upper limits:
```
g > 17.8 mag
r > 17.7 mag
i > 17.5 mag
H > 17.5 mag
```
All magnitudes are in the AB system and are not corrected for Galactic reddening. The photometry is calibrated against the APASS (optical) and 2MASS (NIR) catalogues.
GCN Circular #17395
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 150203A (Ukwatta et al., GCNC 17377) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2015-02-03 10:36:11 UT (~6.5 h after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 17384) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.36578    12:55:51    6060.0   >19.8  >19.5  >18.7
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #17397
B.P. Gompertz (U. Leicester), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 5.7 ks of XRT data for GRB 150203A (Ukwatta et al. GCN Circ. 17377), from 64 s to 24.0 ks after the BAT trigger. The data comprise 76 s in Windowed Timing (WT) mode (the first 8 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. 17378).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.84 (+0.15, -0.13), followed by a break at T+355 s to an alpha of 0.59 (+0.09, -0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.87 (+0.29, -0.27). The best-fitting absorption column is 1.20 (+0.35, -0.30) x 10^22 cm^-2, in excess of the Galactic value of 6.5 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.1 (+0.4, -0.3) and a best-fitting absorption column of 1.5 (+0.5, -0.4) x 10^22 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.3 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.5 (+0.5, -0.4) x 10^22 cm^-2
Galactic foreground: 6.5 x 10^21 cm^-2
Excess significance: 3.5 sigma
Photon index:	     2.1 (+0.4, -0.3)
```
If the light curve continues to decay with a power-law decay index of 0.59, the count rate at T+24 hours will be 0.011 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.6 x 10^-13 (1.2 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00629578.
This circular is an official product of the Swift-XRT team.
GCN Circular #17399
L. Elenin (KIAM), A. Volnova (IKI), E. Mazaeva (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150203A (Ukwatta et al., GCN 17377) with 0.4-m telescope of ISON-NM observatory in robotic mode starting on Feb., 03 (UT) 04:10:19 i.e. 72 seconds after burst trigger. We obtained 60 unfiltered images of 30 s exposure. We do not detect any source within enhanced XRT error circle (Evans et al., GCN 17384):
```
Date          UT start   t-T0             Exp.    Filter   UL (3sigma)
                               (mid.,days)    (s)
2014-02-03 04:10:19  0.00130       2*30    Clear   18.0
2014-02-03 04:10:19  0.01836     60*30    Clear   19.7
```
The photometry is based on nearby USNO-B1.0 stars
```
USNO-B1.0    RA              Dec             R2
0968-0105340 06:33:22.23 +06:53:43.2 15.41
0969-0108800 06:33:26.73 +06:56:58.4 14.77
0969-0108730 06:33:22.76 +06:55:10.3 15.73 
```
GCN Circular #17400
M. M. Chester (PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150203A 83 s after the BAT trigger (Ukwatta et al., GCN Circ. 17377). No optical afterglow consistent with the enhanced XRT position (Evans et al. GCN Circ. 17384) 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) exposures and subsequent exposures are:
```
Filter   T_start(s)   T_stop(s)      Exp(s)       Mag

white_FC         83         232         147     >20.6
white            83        1197         353     >21.2 
v               624        1246          78     >18.7
b               550        1172          58     >19.4
u_FC            295         545         246     >20.0
u               295        1148         285     >20.0
w1              674        1278          61     >18.8
m2              649        1271          78     >18.7
w2              600        1222          78     >19.0
```
The magnitudes in the table are not corrected for the large Galactic extinction in the direction of the burst (reddening of E(B-V) = 0.9; Schlegel et al. 1998).
GCN Circular #17402
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report:
The RAPTOR network of robotic optical telescopes made observations of Swift trigger 629578 (Ukwatta, et al., GCN 17377). Our narrow-field instruments located in Los Alamos, NM, USA, arrived on target 4.6 s after receipt of the notice (T+30.9 s after the BAT trigger time). No optical counterpart is detected within the Swift XRT counterpart location. Typical 3-sigma limiting magnitudes for our initial 5 s exposures were R~16.6 and I~15.7 based on comparision to the USNO-B1 R-band catalog.
The burst location was also within the field of view of our wide-field sky monitors during the gamma-ray emitting interval. No optical counterpart is detected in any of our wide-field monitor images. Typical 3-sigma unfiltered limiting magnitudes during this period were V~9.7 based on comparison to the Tycho-2 V-band catalog.
GCN Circular #17410
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-120 to T+1190 sec from the recent telemetry downlink, we report further analysis of BAT GRB GRB 150203A (trigger #629578) (Ukwatta, et al., GCN Circ. 17377).The BAT ground-calculated position is RA, Dec = 98.394, 6.952 deg which is
```
   RA(J2000)  =  06h 33m 34.5s
   Dec(J2000) = +06d 57' 07.1"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%.
BAT light curve shows a single multi-peaked episode starting around T-2 sec, and ending around T+32 sec. The two main peaks of the light curve can be seen at T+1 sec and T+18 sec. T90 (15-350 keV) is 25.8 +- 5.0 sec (estimated error including systematics).
The time-averaged spectrum from T-0.8 to T+32.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.90 +- 0.12. The fluence in the 15-150 keV band is 9.1 +- 0.6 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+16.79 sec in the 15-150 keV band is 0.9 +- 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/629578/BA/
GCN Circular #17425
D. Kawamura, T. Sakamoto, A. Yoshida (AGU)
We observed the field of GRB 150203A detected by Swift (trigger #629578; Ukwatta et al., GCN Circ. 17377) with the iTelescope.Net (http://www.itelescope.net) T11 (0.50 m Plane Wave) telescope located at the New Mexico Skies Observatory (NM, USA). 20 images of 60 sec exposures were taken in the R filter starting from February 3 4:22:11 (UT) about 13.3 minutes after the trigger and stopped on February 3 4:47:29 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the enhanced X-ray afterglow position (Evans et al., GCN Circ. 17378). The estimated five sigma upper limit of the combined image (total exposure of 1200 sec) is ~18.9 using the USNO-B1 catalog.

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Jochen Greiner, last update: 07-Feb-2015 [Disclaimer]