Gamma-ray Burst 150201A

(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:     Sun 01 Feb 15 13:47:16 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     629302,   Seg_Num: 0
GRB_RA:           11.832d {+00h 47m 20s} (J2000),
                  12.012d {+00h 48m 03s} (current),
                  11.235d {+00h 44m 56s} (1950)
GRB_DEC:         -37.625d {-37d 37' 29"} (J2000),
                 -37.543d {-37d 32' 33"} (current),
                 -37.898d {-37d 53' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       16182 [cnts]    Image_Peak=229 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       26837 [cnts]
BKG_TIME:        49602.87 SOD {13:46:42.87} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49619.70 SOD {13:46:59.70} UT
GRB_PHI:         -63.75 [deg]
GRB_THETA:        46.44 [deg]
SOLN_STATUS:     0x20000083
RATE_SIGNIF:     204.34 [sigma]
IMAGE_SIGNIF:    6.54 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  -4  +0  +0 -59  +0 
SUN_POSTN:       314.84d {+20h 59m 21s}  -17.09d {-17d 05' 14"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.41d {+07h 05m 38s}  +17.50d {+17d 29' 47"}
MOON_DIST:       103.96 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.39,-79.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.10,-38.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 54.92,-10.85 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=444491218).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:47:30 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     444491218
GRB_RA:            5.967d {+00h 23m 52s} (J2000),
                   6.152d {+00h 24m 37s} (current),
                   5.350d {+00h 21m 24s} (1950)
GRB_DEC:         -41.200d {-41d 12' 00"} (J2000),
                 -41.116d {-41d 06' 58"} (current),
                 -41.477d {-41d 28' 36"} (1950)
GRB_ERROR:       3.50 [deg radius, statistical plus systematic]
GRB_INTEN:       3827 [cnts/sec]
DATA_SIGNIF:     383.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49615.15 SOD {13:46:55.15} UT
GRB_PHI:         292.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.96
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       314.84d {+20h 59m 21s}  -17.09d {-17d 05' 14"}
SUN_DIST:         49.96 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      106.41d {+07h 05m 39s}  +17.50d {+17d 29' 47"}
MOON_DIST:       109.01 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      323.12,-74.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      345.74,-39.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150201574/quicklook/glg_lc_medres34_bn150201574.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 337.08,0.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=629302).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:47:33 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     444491218
GRB_RA:            9.670d {+00h 38m 41s} (J2000),
                   9.853d {+00h 39m 25s} (current),
                   9.063d {+00h 36m 15s} (1950)
GRB_DEC:         -36.520d {-36d 31' 11"} (J2000),
                 -36.437d {-36d 26' 13"} (current),
                 -36.795d {-36d 47' 40"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     291.00 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49615.15 SOD {13:46:55.15} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:        60.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       314.84d {+20h 59m 21s}  -17.09d {-17d 05' 14"}
SUN_DIST:         52.02 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      106.41d {+07h 05m 39s}  +17.50d {+17d 29' 47"}
MOON_DIST:       105.44 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      318.20,-80.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      351.89,-36.85 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150201574/quicklook/glg_lc_medres34_bn150201574.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=629302).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:48:10 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     444491218
GRB_RA:            9.660d {+00h 38m 38s} (J2000),
                   9.843d {+00h 39m 22s} (current),
                   9.053d {+00h 36m 13s} (1950)
GRB_DEC:         -36.610d {-36d 36' 35"} (J2000),
                 -36.527d {-36d 31' 37"} (current),
                 -36.885d {-36d 53' 04"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     237.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49615.15 SOD {13:46:55.15} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:        60.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       314.84d {+20h 59m 21s}  -17.09d {-17d 05' 13"}
SUN_DIST:         52.02 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      106.42d {+07h 05m 40s}  +17.50d {+17d 29' 45"}
MOON_DIST:       105.47 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      318.10,-80.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      351.83,-36.92 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150201574/quicklook/glg_lc_medres34_bn150201574.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=629302).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:47:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     444491218
GRB_RA:            5.917d {+00h 23m 40s} (J2000),
                   6.102d {+00h 24m 25s} (current),
                   5.300d {+00h 21m 12s} (1950)
GRB_DEC:         -41.417d {-41d 25' 00"} (J2000),
                 -41.333d {-41d 19' 58"} (current),
                 -41.694d {-41d 41' 37"} (1950)
GRB_ERROR:       3.60 [deg radius, statistical plus systematic]
GRB_INTEN:       2926 [cnts/sec]
DATA_SIGNIF:     52.10 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49615.15 SOD {13:46:55.15} UT
GRB_PHI:         292.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       314.84d {+20h 59m 21s}  -17.09d {-17d 05' 14"}
SUN_DIST:         49.97 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:      106.41d {+07h 05m 39s}  +17.50d {+17d 29' 47"}
MOON_DIST:       109.07 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      322.91,-74.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      345.55,-39.62 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150201574/quicklook/glg_lc_medres34_bn150201574.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 337.08,0.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=629302).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:48:59 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     629302,   Seg_Num: 0
GRB_RA:           11.8325d {+00h 47m 19.79s} (J2000),
                  12.0124d {+00h 48m 02.98s} (current),
                  11.2351d {+00h 44m 56.42s} (1950)
GRB_DEC:         -37.6193d {-37d 37' 09.4"} (J2000),
                 -37.5371d {-37d 32' 13.6"} (current),
                 -37.8921d {-37d 53' 31.4"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.03e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.04 [sigma]
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49706.87 SOD {13:48:26.87} UT,   87.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.23 261.55 243.68
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 13"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.42d {+07h 05m 42s}  +17.49d {+17d 29' 42"}
MOON_DIST:       103.97 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.39,-79.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      353.10,-38.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.34 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:49:08 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     629302,   Seg_Num: 0
GRB_RA:           11.8325d {+00h 47m 19.7s} (J2000),
                  12.0124d {+00h 48m 02.9s} (current),
                  11.2351d {+00h 44m 56.4s} (1950)
GRB_DEC:         -37.6193d {-37d 37' 09.4"} (J2000),
                 -37.5371d {-37d 32' 13.6"} (current),
                 -37.8921d {-37d 53' 31.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       101 [cnts]
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49706.87 SOD {13:48:26.87} UT,   87.2 [sec] since BAT Trigger Time
CENTROID_X:      273.29,  raw= 273  [pixels]
CENTROID_Y:      294.62,  raw= 295  [pixels]
ROLL:            276.06 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -7.47
GRB_POS_XRT_Z:   -75.45
IMAGE_URL:       sw00629302000msxps_rw.img
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 13"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.43d {+07h 05m 42s}  +17.49d {+17d 29' 41"}
MOON_DIST:       103.97 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.39,-79.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      353.10,-38.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:49:15 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     629302,   Seg_Num: 0
GRB_RA:           11.8325d {+00h 47m 19.7s} (J2000),
                  12.0124d {+00h 48m 02.9s} (current),
                  11.2351d {+00h 44m 56.4s} (1950)
GRB_DEC:         -37.6193d {-37d 37' 09.4"} (J2000),
                 -37.5371d {-37d 32' 13.6"} (current),
                 -37.8921d {-37d 53' 31.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       101 [cnts]
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49706.87 SOD {13:48:26.87} UT,   87.2 [sec] since BAT Trigger Time
CENTROID_X:      273.29,  raw= 273  [pixels]
CENTROID_Y:      294.62,  raw= 295  [pixels]
ROLL:            276.06 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -7.47
GRB_POS_XRT_Z:   -75.45
IMAGE_URL:       sw00629302000msxps_rw.img
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 13"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.43d {+07h 05m 43s}  +17.49d {+17d 29' 41"}
MOON_DIST:       103.97 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.39,-79.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      353.10,-38.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:50:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     629302,   Seg_Num: 0
GRB_RA:           11.832d {+00h 47m 20s} (J2000),
                  12.012d {+00h 48m 03s} (current),
                  11.235d {+00h 44m 56s} (1950)
GRB_DEC:         -37.625d {-37d 37' 29"} (J2000),
                 -37.543d {-37d 32' 33"} (current),
                 -37.898d {-37d 53' 51"} (1950)
GRB_DATE:        17054 TJD;    32 DOY;   15/02/01
GRB_TIME:        49619.70 SOD {13:46:59.70} UT
TRIGGER_INDEX:   155
GRB_PHI:         -63.75 [deg]
GRB_THETA:        46.44 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     204.34 [sigma]
IMAGE_SIGNIF:    6.54 [sigma]
LC_URL:          sw00629302000msb.lc
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 11"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.44d {+07h 05m 46s}  +17.49d {+17d 29' 36"}
MOON_DIST:       103.98 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.39,-79.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      353.10,-38.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 54.92,-10.85 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:51:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.859d {+00h 47m 26s} (J2000)
POINT_DEC:       -37.624d {-37d 37' 24"} (J2000)
POINT_ROLL:      276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49712.68 SOD {13:48:32.68} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.815
N_STARS:         16
X_OFFSET:        616 [pixels]
Y_OFFSET:        464 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1423 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00629302000msufc0092.fits
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 11"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.45d {+07h 05m 47s}  +17.49d {+17d 29' 34"}
MOON_DIST:       103.96 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.27,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:51:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.859d {+00h 47m 26s} (J2000)
POINT_DEC:       -37.624d {-37d 37' 24"} (J2000)
POINT_ROLL:      276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49712.68 SOD {13:48:32.68} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.815
N_STARS:         16
X_OFFSET:        616 [pixels]
Y_OFFSET:        464 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1423 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00629302000msufc0092.fits
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 11"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.45d {+07h 05m 48s}  +17.49d {+17d 29' 33"}
MOON_DIST:       103.96 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.27,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 13:53:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.859d {+00h 47m 26s} (J2000)
POINT_DEC:       -37.624d {-37d 37' 24"} (J2000)
ROLL:            276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49712.68 SOD {13:48:32.68} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444491325
X_OFFSET:        957 [pixels]
Y_OFFSET:        817 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1117
Y_GRB_POS:       977
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0106.fits
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 10"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.46d {+07h 05m 51s}  +17.49d {+17d 29' 29"}
MOON_DIST:       103.97 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.27,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 13:53:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.859d {+00h 47m 26s} (J2000)
POINT_DEC:       -37.624d {-37d 37' 24"} (J2000)
ROLL:            276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49712.68 SOD {13:48:32.68} UT,   93.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444491325
X_OFFSET:        957 [pixels]
Y_OFFSET:        817 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1117
Y_GRB_POS:       977
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0106.fits
SUN_POSTN:       314.84d {+20h 59m 22s}  -17.09d {-17d 05' 10"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.46d {+07h 05m 51s}  +17.49d {+17d 29' 28"}
MOON_DIST:       103.97 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.27,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 13:57:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.861d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 31"} (J2000)
POINT_ROLL:      276.060d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49925.59 SOD {13:52:05.59} UT,   305.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.760
N_STARS:         7
X_OFFSET:        637 [pixels]
Y_OFFSET:        497 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1456 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00629302000msufc0305.fits
SUN_POSTN:       314.85d {+20h 59m 23s}  -17.09d {-17d 05' 06"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.50d {+07h 06m 01s}  +17.49d {+17d 29' 13"}
MOON_DIST:       104.00 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 13:58:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.861d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 31"} (J2000)
POINT_ROLL:      276.060d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49925.59 SOD {13:52:05.59} UT,   305.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.760
N_STARS:         7
X_OFFSET:        637 [pixels]
Y_OFFSET:        497 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1456 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00629302000msufc0305.fits
SUN_POSTN:       314.85d {+20h 59m 23s}  -17.09d {-17d 05' 06"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.51d {+07h 06m 01s}  +17.49d {+17d 29' 13"}
MOON_DIST:       104.00 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 13:59:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.861d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 31"} (J2000)
ROLL:            276.060d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49925.59 SOD {13:52:05.59} UT,   305.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444491538
X_OFFSET:        957 [pixels]
Y_OFFSET:        817 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1117
Y_GRB_POS:       977
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0319.fits
SUN_POSTN:       314.85d {+20h 59m 23s}  -17.09d {-17d 05' 05"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.52d {+07h 06m 04s}  +17.49d {+17d 29' 09"}
MOON_DIST:       104.01 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 13:59:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.861d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 31"} (J2000)
ROLL:            276.060d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  49925.59 SOD {13:52:05.59} UT,   305.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     444491538
X_OFFSET:        957 [pixels]
Y_OFFSET:        817 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1117
Y_GRB_POS:       977
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0319.fits
SUN_POSTN:       314.85d {+20h 59m 23s}  -17.09d {-17d 05' 05"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.52d {+07h 06m 04s}  +17.49d {+17d 29' 08"}
MOON_DIST:       104.01 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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 #17368
J. K. Cannizzo (NASA/UMBC), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), D. Malesani (DARK/NBI), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 13:46:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150201A (trigger=629302). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 11.832, -37.625 which is
```
   RA(J2000) = 00h 47m 20s
   Dec(J2000) = -37d 37' 29"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 20 sec. The peak count rate was ~21500 counts/sec (15-350 keV), at ~2 sec before the trigger.
The XRT began observing the field at 13:48:26.8 UT, 87.2 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 11.8325, -37.6193 which is equivalent to:
```
   RA(J2000)  = +00h 47m 19.80s
   Dec(J2000) = -37d 37' 09.5"
```
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This location is 20 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 3.03e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 92 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 expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 14:02:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.862d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 32"} (J2000)
POINT_ROLL:      276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  50479.60 SOD {14:01:19.60} UT,   859.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.968
N_STARS:         22
X_OFFSET:        397 [pixels]
Y_OFFSET:        257 [pixels]
X_MAX:           1836 [pixels]
Y_MAX:           1696 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00629302000msufc0859.fits
SUN_POSTN:       314.85d {+20h 59m 24s}  -17.08d {-17d 05' 03"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.55d {+07h 06m 11s}  +17.48d {+17d 28' 58"}
MOON_DIST:       104.03 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 01 Feb 15 14:02:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.862d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 32"} (J2000)
POINT_ROLL:      276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  50479.60 SOD {14:01:19.60} UT,   859.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.968
N_STARS:         22
X_OFFSET:        397 [pixels]
Y_OFFSET:        257 [pixels]
X_MAX:           1836 [pixels]
Y_MAX:           1696 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00629302000msufc0859.fits
SUN_POSTN:       314.85d {+20h 59m 24s}  -17.08d {-17d 05' 03"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.55d {+07h 06m 12s}  +17.48d {+17d 28' 57"}
MOON_DIST:       104.03 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 14:04:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.862d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 32"} (J2000)
ROLL:            276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  50479.60 SOD {14:01:19.60} UT,   859.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444492092
X_OFFSET:        956 [pixels]
Y_OFFSET:        816 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1116
Y_GRB_POS:       976
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0873.fits
SUN_POSTN:       314.85d {+20h 59m 24s}  -17.08d {-17d 05' 02"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.56d {+07h 06m 14s}  +17.48d {+17d 28' 53"}
MOON_DIST:       104.04 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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:     Sun 01 Feb 15 14:04:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     629302,   Seg_Num: 0
POINT_RA:         11.862d {+00h 47m 27s} (J2000)
POINT_DEC:       -37.626d {-37d 37' 32"} (J2000)
ROLL:            276.061d
IMG_START_DATE:  17054 TJD;    32 DOY;   15/02/01
IMG_START_TIME:  50479.60 SOD {14:01:19.60} UT,   859.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     444492092
X_OFFSET:        956 [pixels]
Y_OFFSET:        816 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1116
Y_GRB_POS:       976
BINNING_INDEX:   1
IM_URL:          sw00629302000msuni0873.fits
SUN_POSTN:       314.85d {+20h 59m 24s}  -17.08d {-17d 05' 02"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:      106.56d {+07h 06m 15s}  +17.48d {+17d 28' 52"}
MOON_DIST:       104.04 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      307.26,-79.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      353.12,-38.67 [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 #17369
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 308 s of XRT Photon Counting mode data and 1 UVOT images for GRB 150201A, 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 = 11.83271, -37.61883 which is equivalent to:
```
RA (J2000): 00h 47m 19.85s
Dec (J2000): -37d 37' 07.8"
```
with an uncertainty of 1.6 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 #17370
H.-F. Yu (MPE) and V. Pelassa (UAH) report on behalf of the Fermi GBM Team:
"At 13:46:55.15 UT on 01 Feb 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150201A (trigger 444491218 / 150201574), which was also detected by the Swift (Cannizzo et al. 2015, GCN 17368). The GBM on-ground location is consistent with the Swift position. The trigger resulted in an Autonomous Repoint Request (ARR) that was accepted and the spacecraft slewed to the GBM in-flight location. The angle from the Fermi LAT boresight is about 60 degrees.
The GBM light curve shows a double-peaked pulse with a duration (T90) of about 16 s (50-300 keV). The time-averaged spectrum from T0-2.816 s to T0+36.097 s is well fit by a Band function with Epeak = 131 +/- 2 keV, alpha = -1.02 +/- 0.01, and beta = -2.70 +/- 0.06. The event fluence (10-1000 keV) in this time interval is (6.63 +/- 0.05)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+4.608 s in the 10-1000 keV band is 88.7 +/- 0.7 ph/s/cm^2.
GBM triggered on GRB 150201590 23 minutes after GRB 150201A, at 14:09:56 UT (MET 444492598). The GBM localization of this 2nd trigger is RA, Dec = 2.1, -40.7 with an uncertainty of 2.7 deg (radius, 1-sigma containment,statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). This is consistent with the position of GRB 150201A.
As seen by GBM, this second event shows a multi-peaked pulse with a duration (T90) of about 26 s (50-300 keV). The time-averaged spectrum from T0-0.512 s to T0+22.016 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.61 +/- 0.15 and the cutoff energy, parameterized as Epeak, is 105 +/- 8 keV. The event fluence (10-1000 keV) in this time interval is (2.13 +/- 0.11)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+7.104 s in the 10-1000 keV band is 2.1 +/- 0.2 ph/s/cm^2.
At the time of this 2nd trigger the position of 150201A was occulted by the Earth to the Swift spacecraft. The GBM data suggest the two events may have a common origin. Because of the uncertainty in the GBM localization, we cannot exclude the possibility that this is a chance coincidence and that GRB 150201590 is unrelated to GRB 150201A.
Owing to the possible relationship between the two triggers, which would make this an unusually long GRB, Fermi is observing the position of GRB 150201A as a target of opportunity for a period of 24 hours, subject to Earth limb constraints.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #17371
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU) and J.K. Cannizzo report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of XRT data for GRB 150201A (Cannizzo et al. GCN Circ. 17368), from 75 s to 51.9 ks after the BAT trigger. The data comprise 823 s in Windowed Timing (WT) mode (the first 7 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 Osborne et al. (GCN Circ. 17369).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.12 (+0.15, -0.13). At T+161 s the decay flattens to an alpha of 0.62 (+0.03, -0.04) before breaking again at T+833 s to a final decay with index alpha=1.256 (+0.032, -0.026).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.86 (+/-0.04). The best-fitting absorption column is 3.82 (+0.21, -0.20) x 10^21 cm^-2, in excess of the Galactic value of 5.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.30 (+0.17, -0.16) and a best-fitting absorption column of 4.7 (+0.8, -0.7) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (6.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.7 (+0.8, -0.7) x 10^21 cm^-2
Galactic foreground: 5.8 x 10^20 cm^-2
Excess significance: 9.3 sigma
Photon index:	     2.30 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 1.256, the count rate at T+24 hours will be 0.037 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-12 (2.4 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/00629302.
This circular is an official product of the Swift-XRT team.
GCN Circular #17372
F. Knust, T. Schweyer, J. Bolmer, J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 150201A (Swift trigger 629302; J. K. Cannizzo et al., GCN #17368) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 00:47 UT on 2015-02-02, 11hrs after the GRB trigger. They were performed at an average seeing of 1.64" and at an average airmass of 2.1. We do not detect a source within the Swift-XRT error circle reported by J.P. Osborne et al. (GCN #17369) down to
```
g' > 23.2 mag, 
r' > 23.1 mag, 
i' > 23.5 mag, 
z' > 23.6 mag, 
J > 21.5 mag, 
H > 21.0 mag, and 
K > 19.4 mag. 
```
The given limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.012 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17373
S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration, intense GRB 150201A (Swift BAT trigger 629302: Cannizzo et al., GCN 17368; Fermi-GBM detection: Yu and Pelassa, GCN 17370) triggered Konus-Wind at T0=49611.653 s UT (13:46:51.653).
The burst light curve shows a double-peaked pulse with a total duration of ~26 s. The emission is seen up to ~10 MeV. No post-burst activity was observed by Konus-Wind until ~T0+450s; also, since the instrument switched to the read-out mode, there are no triggered or waiting mode data available for the time of the second GBM trigger 150201590 (14:09:56 UT; GCN 17370).
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150201_T49611/
As observed by Konus-Wind, the burst had a fluence of 6.18(-0.22,+0.23)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.712 s, of 2.10(-0.28,+0.30)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+22.272 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.20(-0.11,+0.13), the high energy photon index beta = -2.89(-0.27,+0.17), the peak energy 123(-6,+5) keV (chi2 = 88/93 dof)
The spectrum near the maximum count rate (measured from T0 to T0+2.048 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.77(-0.12,+0.14), the high energy photon index beta = -2.47(-0.25,+0.17), the peak energy 193(-20,+21) keV (chi2 = 65/50 dof)
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #17374
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150201A (trigger #629302) (Cannizzo, et al., GCN Circ. 17368). The BAT ground-calculated position is RA, Dec = 11.820 -37.620 deg which is
```
    RA(J2000)  = 00h 47m 16.8s
    Dec(J2000) =  -37d 37' 10"
```
with an uncertainty of 1.7 arcmin,(radius, sys+stat, 90% containment). It is 0.6 arcmin from the XRT enhanced position. The partial coding was 3%.
The burst was outside the BAT calibrated field of view. It came into the field during the slew to point the narrow-field instruments. The earliest calibrated event data starts at about T+22 s. The non-weighted light curve shows two main peaks at about T-3 and T+1 seconds. The emission is detectable out to approximately T+50 sec. T90 (15-350 keV) is 26.1 +- 5.2 sec (estimated error including systematics).
The time-averaged spectrum from T+22.2 to T+49.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.32 +- 0.24. The fluence in the 15-150 keV band is 7.8 +- 1.2 x 10^-07 erg/cm2. This calibrated fluence is on the order of 5% of the total fluence. 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/629302/BA/
GCN Circular #17375
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (CRESST/GSFC/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150201A 93 s after the BAT trigger (Cannizzo et al., GCN Circ. 17368). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 17369) 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         >21.0
u_FC               306          556          246         >20.4
white               93          913          239         >21.5
v                  635          829           39         >18.6
b                  561          755           35         >19.8
u                  306          729          265         >20.3
w1                 685          705           19         >19.6
w2                 784          804           19         >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Report 481.1
GCN_Report 481.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_481_1.pdf by J.K. Cannizzo at NASA/UMBC titled: "Swift Observations of GRB 150201A"

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Jochen Greiner, last update: 08-Feb-2015 [Disclaimer]