Gamma-ray Burst 150202A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:10:33 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     629547,   Seg_Num: 0
GRB_RA:           39.236d {+02h 36m 57s} (J2000),
                  39.394d {+02h 37m 35s} (current),
                  38.710d {+02h 34m 50s} (1950)
GRB_DEC:         -33.150d {-33d 08' 59"} (J2000),
                 -33.085d {-33d 05' 05"} (current),
                 -33.366d {-33d 21' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8341 [cnts]    Image_Peak=337 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       78480 [cnts]
BKG_TIME:        83370.86 SOD {23:09:30.86} UT
BKG_DUR:         24 [sec]
GRB_DATE:        17055 TJD;    33 DOY;   15/02/02
GRB_TIME:        83402.35 SOD {23:10:02.35} UT
GRB_PHI:          80.16 [deg]
GRB_THETA:        22.71 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.68 [sigma]
IMAGE_SIGNIF:    10.85 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  +0  +0  +0 -25  +0 
SUN_POSTN:       316.25d {+21h 05m 01s}  -16.69d {-16d 41' 11"}
SUN_DIST:         75.37 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.83d {+08h 15m 18s}  +14.99d {+14d 59' 18"}
MOON_DIST:        93.59 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.18,-66.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.48,-45.43 [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 = 237.42,-17.36 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:11:36 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.207d {+02h 36m 50s} (J2000)
POINT_DEC:       -33.155d {-33d 09' 16"} (J2000)
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83490.39 SOD {23:11:30.39} UT,   88.0 [sec] since BAT Trigger Time
COUNTS:          11    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    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:     Mon 02 Feb 15 23:13:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     629547,   Seg_Num: 0
GRB_RA:           39.236d {+02h 36m 57s} (J2000),
                  39.394d {+02h 37m 35s} (current),
                  38.710d {+02h 34m 50s} (1950)
GRB_DEC:         -33.150d {-33d 08' 59"} (J2000),
                 -33.085d {-33d 05' 05"} (current),
                 -33.366d {-33d 21' 58"} (1950)
GRB_DATE:        17055 TJD;    33 DOY;   15/02/02
GRB_TIME:        83402.35 SOD {23:10:02.35} UT
TRIGGER_INDEX:   262
GRB_PHI:          80.16 [deg]
GRB_THETA:        22.71 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.68 [sigma]
IMAGE_SIGNIF:    10.85 [sigma]
LC_URL:          sw00629547000msb.lc
SUN_POSTN:       316.26d {+21h 05m 01s}  -16.69d {-16d 41' 09"}
SUN_DIST:         75.37 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.85d {+08h 15m 25s}  +14.98d {+14d 58' 59"}
MOON_DIST:        93.61 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.18,-66.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.48,-45.43 [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 = 237.42,-17.36 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:14:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.206d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.155d {-33d 09' 17"} (J2000)
POINT_ROLL:      259.519d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83495.35 SOD {23:11:35.35} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.173
N_STARS:         27
X_OFFSET:        308 [pixels]
Y_OFFSET:        655 [pixels]
X_MAX:           1267 [pixels]
Y_MAX:           1614 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00629547000msufc0093.fits
SUN_POSTN:       316.26d {+21h 05m 02s}  -16.69d {-16d 41' 08"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.86d {+08h 15m 26s}  +14.98d {+14d 58' 56"}
MOON_DIST:        93.64 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.20,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.45,-45.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:15:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.206d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.155d {-33d 09' 17"} (J2000)
POINT_ROLL:      259.519d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83495.35 SOD {23:11:35.35} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.173
N_STARS:         27
X_OFFSET:        308 [pixels]
Y_OFFSET:        655 [pixels]
X_MAX:           1267 [pixels]
Y_MAX:           1614 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00629547000msufc0093.fits
SUN_POSTN:       316.26d {+21h 05m 02s}  -16.69d {-16d 41' 08"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.86d {+08h 15m 28s}  +14.98d {+14d 58' 52"}
MOON_DIST:        93.64 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.20,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.45,-45.42 [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:     Mon 02 Feb 15 23:15:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.206d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.155d {-33d 09' 17"} (J2000)
ROLL:            259.519d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83495.35 SOD {23:11:35.35} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444611508
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0107.fits
SUN_POSTN:       316.26d {+21h 05m 02s}  -16.69d {-16d 41' 07"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.87d {+08h 15m 29s}  +14.98d {+14d 58' 50"}
MOON_DIST:        93.65 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.20,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.45,-45.42 [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:     Mon 02 Feb 15 23:15:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.206d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.155d {-33d 09' 17"} (J2000)
ROLL:            259.519d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83495.35 SOD {23:11:35.35} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444611508
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0107.fits
SUN_POSTN:       316.26d {+21h 05m 02s}  -16.69d {-16d 41' 07"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.87d {+08h 15m 29s}  +14.98d {+14d 58' 48"}
MOON_DIST:        93.65 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.20,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.45,-45.42 [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:     Mon 02 Feb 15 23:15:56 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     629547,   Seg_Num: 0
GRB_RA:           39.2273d {+02h 36m 54.55s} (J2000),
                  39.3859d {+02h 37m 32.62s} (current),
                  38.7016d {+02h 34m 48.38s} (1950)
GRB_DEC:         -33.1480d {-33d 08' 52.8"} (J2000),
                 -33.0830d {-33d 04' 58.7"} (current),
                 -33.3645d {-33d 21' 52.0"} (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:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83501.00 SOD {23:11:41.00} UT,   98.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       316.26d {+21h 05m 02s}  -16.69d {-16d 41' 07"}
SUN_DIST:         75.36 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.87d {+08h 15m 29s}  +14.98d {+14d 58' 47"}
MOON_DIST:        93.63 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.18,-66.49 [deg] galactic lon,lat of the burst
ECL_COORDS:       22.47,-45.42 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:23:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
POINT_ROLL:      259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83707.17 SOD {23:15:07.17} UT,   304.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.516
N_STARS:         62
X_OFFSET:        68 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00629547000msufc0304.fits
SUN_POSTN:       316.26d {+21h 05m 03s}  -16.68d {-16d 41' 02"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.93d {+08h 15m 44s}  +14.97d {+14d 58' 07"}
MOON_DIST:        93.69 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:23:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
POINT_ROLL:      259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83707.17 SOD {23:15:07.17} UT,   304.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.516
N_STARS:         62
X_OFFSET:        68 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00629547000msufc0304.fits
SUN_POSTN:       316.26d {+21h 05m 03s}  -16.68d {-16d 41' 02"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.94d {+08h 15m 45s}  +14.97d {+14d 58' 05"}
MOON_DIST:        93.70 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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:     Mon 02 Feb 15 23:23:53 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     629547,   Seg_Num: 0
GRB_RA:           39.2274d {+02h 36m 54.57s} (J2000),
                  39.3860d {+02h 37m 32.64s} (current),
                  38.7017d {+02h 34m 48.40s} (1950)
GRB_DEC:         -33.1484d {-33d 08' 54.2"} (J2000),
                 -33.0834d {-33d 05' 00.2"} (current),
                 -33.3649d {-33d 21' 53.5"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83501.00 SOD {23:11:41.00} UT,   98.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       316.26d {+21h 05m 03s}  -16.68d {-16d 41' 01"}
SUN_DIST:         75.36 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.94d {+08h 15m 46s}  +14.97d {+14d 58' 02"}
MOON_DIST:        93.68 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.18,-66.49 [deg] galactic lon,lat of the burst
ECL_COORDS:       22.47,-45.42 [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:     Mon 02 Feb 15 23:24:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
ROLL:            259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83707.17 SOD {23:15:07.17} UT,   304.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444611720
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0318.fits
SUN_POSTN:       316.26d {+21h 05m 03s}  -16.68d {-16d 41' 01"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.95d {+08h 15m 47s}  +14.97d {+14d 57' 58"}
MOON_DIST:        93.70 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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:     Mon 02 Feb 15 23:24:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
ROLL:            259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  83707.17 SOD {23:15:07.17} UT,   304.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444611720
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0318.fits
SUN_POSTN:       316.26d {+21h 05m 03s}  -16.68d {-16d 41' 01"}
SUN_DIST:         75.34 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.95d {+08h 15m 47s}  +14.97d {+14d 57' 57"}
MOON_DIST:        93.70 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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:     Mon 02 Feb 15 23:29:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
POINT_ROLL:      259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  84259.80 SOD {23:24:19.80} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.138
N_STARS:         94
X_OFFSET:        68 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00629547000msufc0857.fits
SUN_POSTN:       316.27d {+21h 05m 04s}  -16.68d {-16d 40' 57"}
SUN_DIST:         75.33 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.99d {+08h 15m 58s}  +14.96d {+14d 57' 28"}
MOON_DIST:        93.73 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Feb 15 23:30:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
POINT_ROLL:      259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  84259.80 SOD {23:24:19.80} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.138
N_STARS:         94
X_OFFSET:        68 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1507 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00629547000msufc0857.fits
SUN_POSTN:       316.27d {+21h 05m 04s}  -16.68d {-16d 40' 57"}
SUN_DIST:         75.33 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      123.99d {+08h 15m 58s}  +14.96d {+14d 57' 26"}
MOON_DIST:        93.74 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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:     Mon 02 Feb 15 23:31:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
ROLL:            259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  84259.80 SOD {23:24:19.80} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444612272
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0871.fits
SUN_POSTN:       316.27d {+21h 05m 04s}  -16.68d {-16d 40' 56"}
SUN_DIST:         75.33 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      124.00d {+08h 16m 01s}  +14.96d {+14d 57' 18"}
MOON_DIST:        93.74 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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:     Mon 02 Feb 15 23:31:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629547,   Seg_Num: 0
POINT_RA:         39.204d {+02h 36m 49s} (J2000)
POINT_DEC:       -33.156d {-33d 09' 20"} (J2000)
ROLL:            259.521d
IMG_START_DATE:  17055 TJD;    33 DOY;   15/02/02
IMG_START_TIME:  84259.80 SOD {23:24:19.80} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444612272
X_OFFSET:        627 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       787
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00629547000msuni0871.fits
SUN_POSTN:       316.27d {+21h 05m 04s}  -16.68d {-16d 40' 56"}
SUN_DIST:         75.33 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      124.01d {+08h 16m 01s}  +14.95d {+14d 57' 18"}
MOON_DIST:        93.74 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      234.21,-66.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.44,-45.42 [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 #17376
H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), M. M. Chester (PSU), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 23:10:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150202A (trigger=629547). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 39.236, -33.150, which is
```
   RA(J2000)  =  02h 36m 57s
   Dec(J2000) = -33d 08' 59"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve show several peaks swith a total duration of about 30 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 23:11:30.3 UT, 88.0 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 39.2275, -33.1485 which is equivalent to:
```
   RA(J2000)  = 02h 36m 54.61s
   Dec(J2000) = -33d 08' 54.5"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 26 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 in excess of the Galactic value (2.54 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 4.3 (+1.96/-1.74) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 304 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 19.2 mag. Data from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is H. A. Krimm (hans.krimm AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #17381
C. Delvaux, K. Varela and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 150202A (SWIFT-629547; Krimm et al., GCN #17376) 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 00:43 UT, 1.5 hrs after the GRB trigger. They were performed at an average seeing of 1.1" and at an average airmass of 1.7.
We do not detect a source inside the 2.1" error circle reported by Krimm et al. (GCN #17376). Based on a total exposure of 2.07 hours in g'r'i'z'and 1.73 hours in JHK, at a midtime of 2 hours after the burst, we measure the following preliminary upper limits (AB magnitudes system):
```
g' > 24.2 mag,
r' > 24.7 mag,
i' > 24.4 mag,
z' > 24.4 mag,
J  > 22.1 mag,
H  > 21.5 mag, and
K  > 18.0 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) = 0.02 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17382
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 3966 s of XRT Photon Counting mode data and 6 UVOT images for GRB 150202A, 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 = 39.22744, -33.14804 which is equivalent to:
```
RA (J2000): 02h 36m 54.59s
Dec (J2000): -33d 08' 53.0"
```
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 #17390
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), J.P. Osborne (U. Leicester) and H.A. Krimm report on behalf of the Swift-XRT team:
We have analysed 6.0 ks of XRT data for GRB 150202A (Krimm et al. GCN Circ. 17376), from 98 s to 24.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 17382).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.62 (+0.12, -0.13), followed by a break at T+1352 s to an alpha of 1.26 (+0.30, -0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+/-0.17). The best-fitting absorption column is 1.7 (+0.6, -0.5) x 10^21 cm^-2, in excess of the Galactic value of 2.5 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 3.5 x 10^-11 (4.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.7 (+0.6, -0.5) x 10^21 cm^-2
Galactic foreground: 2.5 x 10^20 cm^-2
Excess significance: 4.6 sigma
Photon index:	     2.00 (+/-0.17)
```
If the light curve continues to decay with a power-law decay index of 1.26, the count rate at T+24 hours will be 2.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.5 x 10^-14 (1.1 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/00629547.
This circular is an official product of the Swift-XRT team.
GCN Circular #17392
M. M. Chester (PSU) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150202A 93 s after the BAT trigger (Krimm et al., GCN Circ. 17376). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 17382) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            93          243          147         >20.6
u_FC               305          555          246         >20.2
white               93         6568          624         >21.5
v                  634         6980          530         >20.4
b                  560         7617          350         >21.3
u                  305         7594          756         >20.7
w1                 683         7390          510         >20.9
m2                 658         7185          452         >21.7
w2                 610         6774          490         >20.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17401
T. Sakamoto (AGU), 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), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150202A (trigger #629547) (Krimm, et al., GCN Circ. 17376). The BAT ground-calculated position is RA, Dec = 39.261, -33.132 deg which is
```
    RA(J2000)  =  02h 37m 02.6s
    Dec(J2000) = -33d 07' 56.1"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 60%.
The mask-weighted light curve shows a complex structure with multiple peaks. The first emission episode runs from T-2 to T+10 sec and then second episode from T+12 to ~T+30 sec. T90 (15-350 keV) is 25.7 +- 4.3 sec (estimated error including systematics).
The time-averaged spectrum from T-1.7 to T+27.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.50 +- 0.19. The fluence in the 15-150 keV band is 6.1 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+17.40 sec in the 15-150 keV band is 1.0 +- 0.2 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/629547/BA/

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Jochen Greiner, last update: 04-Feb-2015 [Disclaimer]