Gamma-ray Burst 150213B

(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:     Fri 13 Feb 15 22:32:46 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.425d {+16h 53m 42s} (J2000),
                 253.564d {+16h 54m 15s} (current),
                 252.966d {+16h 51m 52s} (1950)
GRB_DEC:         +34.179d {+34d 10' 43"} (J2000),
                 +34.155d {+34d 09' 17"} (current),
                 +34.259d {+34d 15' 33"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1058 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        17066 TJD;    44 DOY;   15/02/13
GRB_TIME:        81090.81 SOD {22:31:30.81} UT
GRB_PHI:         119.50 [deg]
GRB_THETA:        38.74 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.03 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -2  +0  +0  -9  +0 
SUN_POSTN:       327.19d {+21h 48m 45s}  -13.22d {-13d 13' 13"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.68d {+17h 02m 42s}  -18.04d {-18d 02' 10"}
MOON_DIST:        52.23 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.91, 56.18 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 187.04,-10.27 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Feb 15 22:34:29 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.4532d {+16h 53m 48.76s} (J2000),
                 253.5921d {+16h 54m 22.10s} (current),
                 252.9940d {+16h 51m 58.56s} (1950)
GRB_DEC:         +34.1886d {+34d 11' 18.9"} (J2000),
                 +34.1647d {+34d 09' 53.0"} (current),
                 +34.2690d {+34d 16' 08.2"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.84e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.53 [sigma]
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81234.11 SOD {22:33:54.11} UT,   143.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.20 261.66 243.50
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       327.19d {+21h 48m 45s}  -13.22d {-13d 13' 11"}
SUN_DIST:         84.31 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.69d {+17h 02m 46s}  -18.04d {-18d 02' 14"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.54, 38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.95, 56.20 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.51 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:     Fri 13 Feb 15 22:34:47 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.4532d {+16h 53m 48.7s} (J2000),
                 253.5921d {+16h 54m 22.1s} (current),
                 252.9940d {+16h 51m 58.5s} (1950)
GRB_DEC:         +34.1886d {+34d 11' 18.9"} (J2000),
                 +34.1647d {+34d 09' 53.0"} (current),
                 +34.2690d {+34d 16' 08.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       91 [cnts]
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81234.11 SOD {22:33:54.11} UT,   143.3 [sec] since BAT Trigger Time
CENTROID_X:      292.07,  raw= 292  [pixels]
CENTROID_Y:      316.82,  raw= 317  [pixels]
ROLL:            110.12 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   44.85
GRB_POS_XRT_Z:   -31.16
IMAGE_URL:       sw00631051000msxps_rw.img
SUN_POSTN:       327.19d {+21h 48m 45s}  -13.22d {-13d 13' 11"}
SUN_DIST:         84.31 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.70d {+17h 02m 47s}  -18.04d {-18d 02' 15"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.54, 38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.95, 56.20 [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:     Fri 13 Feb 15 22:34:41 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.4532d {+16h 53m 48.7s} (J2000),
                 253.5921d {+16h 54m 22.1s} (current),
                 252.9940d {+16h 51m 58.5s} (1950)
GRB_DEC:         +34.1886d {+34d 11' 18.9"} (J2000),
                 +34.1647d {+34d 09' 53.0"} (current),
                 +34.2690d {+34d 16' 08.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       91 [cnts]
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81234.11 SOD {22:33:54.11} UT,   143.3 [sec] since BAT Trigger Time
CENTROID_X:      292.07,  raw= 292  [pixels]
CENTROID_Y:      316.82,  raw= 317  [pixels]
ROLL:            110.12 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   44.85
GRB_POS_XRT_Z:   -31.16
IMAGE_URL:       sw00631051000msxps_rw.img
SUN_POSTN:       327.19d {+21h 48m 45s}  -13.22d {-13d 13' 11"}
SUN_DIST:         84.31 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.69d {+17h 02m 47s}  -18.04d {-18d 02' 15"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.54, 38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:      244.95, 56.20 [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:     Fri 13 Feb 15 22:35:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.425d {+16h 53m 42s} (J2000),
                 253.564d {+16h 54m 15s} (current),
                 252.966d {+16h 51m 52s} (1950)
GRB_DEC:         +34.179d {+34d 10' 43"} (J2000),
                 +34.155d {+34d 09' 17"} (current),
                 +34.259d {+34d 15' 33"} (1950)
GRB_DATE:        17066 TJD;    44 DOY;   15/02/13
GRB_TIME:        81090.81 SOD {22:31:30.81} UT
TRIGGER_INDEX:   20000
GRB_PHI:         119.50 [deg]
GRB_THETA:        38.74 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.03 [sigma]
LC_URL:          sw00631051000msb.lc
SUN_POSTN:       327.19d {+21h 48m 45s}  -13.22d {-13d 13' 10"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.70d {+17h 02m 49s}  -18.04d {-18d 02' 17"}
MOON_DIST:        52.23 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.91, 56.18 [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 an image 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 = 187.04,-10.27 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Feb 15 22:42:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.441d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.178d {+34d 10' 42"} (J2000)
POINT_ROLL:      110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81243.38 SOD {22:34:03.38} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.409
N_STARS:         40
X_OFFSET:        424 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00631051000msufc0152.fits
SUN_POSTN:       327.19d {+21h 48m 46s}  -13.22d {-13d 13' 04"}
SUN_DIST:         84.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.77d {+17h 03m 06s}  -18.04d {-18d 02' 32"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Feb 15 22:42:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.441d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.178d {+34d 10' 42"} (J2000)
POINT_ROLL:      110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81243.38 SOD {22:34:03.38} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.409
N_STARS:         40
X_OFFSET:        424 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00631051000msufc0152.fits
SUN_POSTN:       327.19d {+21h 48m 46s}  -13.22d {-13d 13' 04"}
SUN_DIST:         84.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.78d {+17h 03m 06s}  -18.04d {-18d 02' 32"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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:     Fri 13 Feb 15 22:44:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.441d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.178d {+34d 10' 42"} (J2000)
ROLL:            110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81243.38 SOD {22:34:03.38} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     445559656
X_OFFSET:        794 [pixels]
Y_OFFSET:        769 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       954
Y_GRB_POS:       929
BINNING_INDEX:   1
IM_URL:          sw00631051000msuni0166.fits
SUN_POSTN:       327.19d {+21h 48m 47s}  -13.22d {-13d 13' 03"}
SUN_DIST:         84.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.79d {+17h 03m 10s}  -18.04d {-18d 02' 35"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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:     Fri 13 Feb 15 22:44:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.441d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.178d {+34d 10' 42"} (J2000)
ROLL:            110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81243.38 SOD {22:34:03.38} UT,   152.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     445559656
X_OFFSET:        794 [pixels]
Y_OFFSET:        769 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       954
Y_GRB_POS:       929
BINNING_INDEX:   1
IM_URL:          sw00631051000msuni0166.fits
SUN_POSTN:       327.19d {+21h 48m 47s}  -13.22d {-13d 13' 03"}
SUN_DIST:         84.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.79d {+17h 03m 10s}  -18.04d {-18d 02' 36"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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:     Fri 13 Feb 15 22:45:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.440d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.179d {+34d 10' 44"} (J2000)
POINT_ROLL:      110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81401.24 SOD {22:36:41.24} UT,   310.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.724
N_STARS:         28
X_OFFSET:        474 [pixels]
Y_OFFSET:        449 [pixels]
X_MAX:           1433 [pixels]
Y_MAX:           1408 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00631051000msufc0310.fits
SUN_POSTN:       327.19d {+21h 48m 47s}  -13.22d {-13d 13' 02"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.80d {+17h 03m 13s}  -18.04d {-18d 02' 38"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Feb 15 22:46:04 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     631051,   Seg_Num: 0
GRB_RA:          253.4527d {+16h 53m 48.64s} (J2000),
                 253.5916d {+16h 54m 21.98s} (current),
                 252.9935d {+16h 51m 58.44s} (1950)
GRB_DEC:         +34.1887d {+34d 11' 19.3"} (J2000),
                 +34.1648d {+34d 09' 53.3"} (current),
                 +34.2691d {+34d 16' 08.6"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.45 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81242.00 SOD {22:34:02.00} UT,   151.2 [sec] since BAT Trigger Time
SUN_POSTN:       327.20d {+21h 48m 47s}  -13.22d {-13d 13' 01"}
SUN_DIST:         84.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.81d {+17h 03m 14s}  -18.04d {-18d 02' 39"}
MOON_DIST:        52.25 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.54, 38.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.95, 56.20 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 1.4 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Feb 15 22:45:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.440d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.179d {+34d 10' 44"} (J2000)
POINT_ROLL:      110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81401.24 SOD {22:36:41.24} UT,   310.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.724
N_STARS:         28
X_OFFSET:        474 [pixels]
Y_OFFSET:        449 [pixels]
X_MAX:           1433 [pixels]
Y_MAX:           1408 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00631051000msufc0310.fits
SUN_POSTN:       327.19d {+21h 48m 47s}  -13.22d {-13d 13' 02"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.81d {+17h 03m 13s}  -18.04d {-18d 02' 39"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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:     Fri 13 Feb 15 22:47:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.440d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.179d {+34d 10' 44"} (J2000)
ROLL:            110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81401.24 SOD {22:36:41.24} UT,   310.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     445559814
X_OFFSET:        794 [pixels]
Y_OFFSET:        769 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       954
Y_GRB_POS:       929
BINNING_INDEX:   1
IM_URL:          sw00631051000msuni0324.fits
SUN_POSTN:       327.20d {+21h 48m 47s}  -13.22d {-13d 13' 01"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.82d {+17h 03m 16s}  -18.05d {-18d 02' 42"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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:     Fri 13 Feb 15 22:47:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     631051,   Seg_Num: 0
POINT_RA:        253.440d {+16h 53m 46s} (J2000)
POINT_DEC:       +34.179d {+34d 10' 44"} (J2000)
ROLL:            110.118d
IMG_START_DATE:  17066 TJD;    44 DOY;   15/02/13
IMG_START_TIME:  81401.24 SOD {22:36:41.24} UT,   310.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     445559814
X_OFFSET:        794 [pixels]
Y_OFFSET:        769 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       954
Y_GRB_POS:       929
BINNING_INDEX:   1
IM_URL:          sw00631051000msuni0324.fits
SUN_POSTN:       327.20d {+21h 48m 47s}  -13.22d {-13d 13' 00"}
SUN_DIST:         84.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      255.82d {+17h 03m 17s}  -18.05d {-18d 02' 42"}
MOON_DIST:        52.24 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       56.52, 38.16 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      244.93, 56.19 [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 #17464
C. Pagani (U Leicester), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 22:31:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150213B (trigger=631051). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 253.425, +34.179 which is
```
   RA(J2000)  =  16h 53m 42s
   Dec(J2000) = +34d 10' 43"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers (64 sec), the realtime TDRSS light curve does not show anything significant.
The XRT began observing the field at 22:33:54.1 UT, 143.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 253.4532, 34.1886 which is equivalent to:
```
   RA(J2000)  = +16h 53m 48.77s
   Dec(J2000) = +34d 11' 19.0"
```
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This location is 90 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 2.84e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 152 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	16:53:48.65 = 253.45271
  DEC(J2000) = +34:11:19.4  =  34.18872
```
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.5 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.46 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is C. Pagani (cp232 AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #17465
D. A. Kann, B. Stecklum, and F. Ludwig (TLS Tautenburg) report:
We began observations of GRB 150213B (Swift trigger 631051, Pagani et al., GCN 17464) with the 1.34m Tautenburg Schmidt telescope about 80 min after the GRB, at airmass 2.9.
At the UVOT position given by Pagani et al., we detect the optical afterglow in multiple Rc band exposures of 600 sec exposure time each. Due to the PSF wings of a nearby bright star, no magnitude can be determined at this time, but the source has clearly faded compared to the early Swift detection.
Observations are ongoing.
GCN Circular #17467
D. Malesani (DARK/NBI), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), P. Jakobsson (Univ. Iceland), and J. Telting (NOT) report on behalf of a larger collaboration:
We observed the field of GRB 150213B (Pagani et al., GCN 17464) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started on Feb 14.22 UT (6.86 hr after the GRB), and consisted of 4x300 s exposures in the SDSS r filter.
The optical afterglow (Pagani et al., GCN 17464; Kann et al., GCN 17465) is well detected in our images. A preliminary analysis yields a magnitude r = 22.10 +- 0.05 (AB), calibrated against nearby SDSS stars.
GCN Circular #17468
A. Pozanenko (IKI), R. Inasaridze (AAO), E. Mazaeva (IKI), A. Volnova (IKI), Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150213B (Pagani et al., GCN 17464) with AS-32 (0.7m) telescope of Abastumani Observatory. We obtained several unfiltered images starting on Feb. 13 (UT) 23:24:58 and ending Feb. 14 (UT) 01:06:30. In the first single images of 120 s exposure we clearly detect the optical afterglow (Pagani et al., GCN 17464; Kann et al., GCN 17465; Malesani et al., GCN 17467). Preliminary photometry of the afterglow is 19.7m (at 54 minutes after burst trigger) in comparison with nearby USNO-B1.0 stars (R2 mags).
Data receiving and reduction is ongoing.
GCN Circular #17469
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and C. Pagani report on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 150213B (Pagani et al. GCN Circ. 17464), from 133 s to 23.5 ks after the BAT trigger. The data comprise 414 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 253.4520, +34.1884 which is equivalent to:
```
RA (J2000): 16 53 48.49
Dec(J2000): +34 11 18.4
```
with an uncertainty of 3.6 arcsec (radius, 90% confidence).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.18 (+0.09, -0.10). At T+310 s the decay steepens to an alpha of 2.46 (+0.26, -0.23) before breaking again at T+2218 s to a final decay with index alpha=1.33 (+0.24, -0.21).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.86 (+0.05, -0.04). The best-fitting absorption column is 5.1 (+/-1.0) x 10^20 cm^-2, in excess of the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.74 (+0.29, -0.26) and a best-fitting absorption column of 6.7 (+7.9, -4.8) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.7 (+7.9, -4.8) x 10^20 cm^-2
Galactic foreground: 1.9 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.74 (+0.29, -0.26)
```
If the light curve continues to decay with a power-law decay index of 1.33, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.9 x 10^-14 (6.6 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00631051.
This circular is an official product of the Swift-XRT team.
GCN Circular #17470
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), Willia= m 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), J= es=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 150213B (Pagani, et al., GCN 17464) 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 14.41 to 2015/02 14.55 UTC (11.27 = to 14.72 hours after the BAT trigger), obtaining a total of 2.58 hours exposure in the r, i, and z bands.
For a source within the Swift-UVOT error circle, in comparison with the SDSS DR9, we obtain the following detections and upper limit (3-sigma):
```
  r =3D 22.4 +/- 0.6
  i =3D 22.1 +/- 0.1
  z > 20.50
```
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 #17471
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), C. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150213B (trigger #631051) (Pagani, et al., GCN Circ. 17464). The BAT ground-calculated position is RA, Dec = 253.448, 34.165 deg, which is
```
   RA(J2000)  =  16h 53m 47.4s 
   Dec(J2000) = +34d 09' 54.5" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 13%.
The mask-weighted light curve shows a FRED peak with a few little peaks starting at ~T+0, peaking at ~T+18, and returning to baseline at ~T+300 sec. T90 (15-350 keV) is 181 +- 60 sec (estimated error including systematics).
The time-averaged spectrum from T+2.09 to T+249.78 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.80 +- 0.79, and Epeak of 54.8 +- 20.6 keV (chi squared 57.4 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.0 +- 0.4 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+18.08 sec in the 15-150 keV band is 1.1 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.77 +- 0.15 (chi squared 63.4 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/631051/BA/
GCN Circular #17472
F. E. Marshall (NASA/GSFC) and C. Pagani (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150213B 153 s after the BAT trigger (Pagani et al., GCN Circ. 17464). A source consistent with the XRT position (Osborne et al. GCN Circ. 17469) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  16:53:48.67 = 253.45278 (deg.)
    Dec (J2000) = +34:11:19.3  =  34.18869 (deg.)
```
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              153          302          147         18.61 +/- 0.07
v                 4498        23548          966        >20.3
b                 3883        12039          961        >20.7
u                  310          532          218         18.76 +/- 0.15
w1                4910        10539         1082         20.76 +/- 0.21
m2                4703        16622         1224         21.25 +/- 0.32
w2                4293        22956         1279         21.48 +/- 0.31
```
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 #17474
S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a larger collaboration:
We have imaged the location of GRB150213B (Pagani et al., GCN 17464) with the robotic Palomar 60 inch telescope. Observations began at 10:15 UT on 2015 Feb 14 (dt ~ 11.7 hr after the Swift trigger) and were obtained in the SDSS g, r, i, and z filters. We marginally detect the optical afterglow (Kann et al., GCN 17465; Malesani et al., GCN 17467; Pozanenko et al., GCN 17468; Butler et al., GCN 17470). Using nearby point sources from SDSS for reference, we measure an r-band magnitude of r' = 22.65 +/- 0.33 - however we caution that the photometry is likely affected by the presence of the nearby bright star (e.g., Kann et al., GCN 17465).
GCN Circular #17475
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 5563 s of XRT Photon Counting mode data and 8 UVOT images for GRB 150213B, 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 = 253.45234, +34.18876 which is equivalent to:
```
RA (J2000): 16h 53m 48.56s
Dec (J2000): +34d 11' 19.5"
```
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 #17478
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), R. Inasaridze (AAO), Sh. Makandarashvili (AAO), Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We report photometry of our observation (GCN 17468) of the field of the Swift GRB 150213B (Pagani et al., GCN 17464) with AS-32 (0.7m) telescope of Abastumani Observatory. The optical afterglow (Pagani et al., GCN 17464; Kann et al., GCN 17465; Malesani et al., GCN 17467) is visible on single images. The photometry of the afterglow is following
```
Date       UT start   t-T0     Filter   Exp.    OT   Err.
                       (mid, days)       (s)
2015-02-13  23:22:23 0.03696   none     2*120  18.98 0.14
2015-02-13  23:27:43 0.04345   none     5*120  19.15 0.10
2015-02-13  23:41:05 0.05273   none     5*120  19.56 0.13
2015-02-13  23:54:27 0.06201   none     5*120  19.12 0.13
2015-02-13  24:07:49 0.07593   none     10*120 19.12 0.06
2015-02-13  24:34:32 0.09634   none     12*120 19.20 0.08
```
The photometry might be affected by the presence of the nearby bright star (e.g., Kann et al., GCN 17465). The photometry is based on nearby SDSS DR9 stars:
```
SDSS9_id            R(Lupton)
J165343,83+341043,0 16,49
J165348,15+341040,4 15,99
J165354,27+341137,8 17,87
J165339,38+341103,1 17,14
J165341,19+341135,8 14,53
```
GCN Circular #17484
V.V. Golovnya (Main Astro Obs., Kyiv) report: We have undertaken the review of the sky area of GRB 150213B (J.P. Osborne et al. GCN Circ. 17475) on astronegatives, collected in Ukrainian plate archive (1976-1996). All the plates with the possible object appearance are digitized using Epson Expression 10000XL flatbed scanner and the images have been placed into Golosiiv Plate Archive database DBGPA with open access to them. The list of plates is given in the table:
```
yyyymmdd/TimeUT   ---Plates----- Exp. -Mag- --USNO-B1--
19770616/20:26:55 GUA040C000526B 60.1 17.26 1241-0248873
19770622/20:59:18 GUA040C000533B 60.0 17.26 1241-0248873
19770707/20:05:18 GUA040D000569A 29.7 17.20 1241-0248872
19770713/20:16:28 GUA040C000578B 30.0 17.20 1241-0248872
19770713/20:16:29 GUA040D000579  30.0 17.20 1241-0248872
```
Plates -the plates archive identifier of DWA D/F=3D400/2000, M=3D103"/mm (Marsden's number - 083) the plate number [1]. Exp. - Duration of the maximum exposures (minutes). Mag - Limited Bmag, derived in the 9 minutes area around the location given in J.P. Osborne et al. GCN Circ. 17475: RA(J2000): 16h 53m 48.56s, Dec(J2000): +34d 11' 19.5". USNO-B1 - Comparison star. The preview images of 5 areas together with the 9 min. of arc area from Aladin can be found in =E2=80=9Chttp://gua.db.ukr-vo.org/img/grb/150213B/index.html=E2=80=9D. The images with full resolution are available via e-mail on demand.
References: 1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0), =E2=80=9Chttp://gua.db.ukr-vo.org=E2=80=9D.

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Jochen Greiner, last update: 21-Feb-2015 [Disclaimer]