Gamma-ray Burst 150616A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 22:50:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.705d {+20h 58m 49s} (J2000),
                 314.985d {+20h 59m 56s} (current),
                 313.795d {+20h 55m 11s} (1950)
GRB_DEC:         -53.394d {-53d 23' 36"} (J2000),
                 -53.333d {-53d 19' 57"} (current),
                 -53.588d {-53d 35' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       57952 [cnts]    Image_Peak=906 [image_cnts]
TRIGGER_DUR:     16.384 [sec] 
TRIGGER_INDEX:   372     E_range: 25-100 keV
BKG_INTEN:       208392 [cnts]
BKG_TIME:        82058.27 SOD {22:47:38.27} UT
BKG_DUR:         64 [sec]
GRB_DATE:        17189 TJD;   167 DOY;   15/06/16
GRB_TIME:        82159.26 SOD {22:49:19.26} UT
GRB_PHI:         -123.23 [deg]
GRB_THETA:        40.16 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.91 [sigma]
IMAGE_SIGNIF:    12.26 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  +2  +0  +0 +67  +0 
SUN_POSTN:        85.07d {+05h 40m 17s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.15 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       89.92d {+05h 59m 42s}  +18.46d {+18d 27' 52"}
MOON_DIST:       130.85 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      300.64,-34.61 [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 = 346.87,11.75 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 22:53:22 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.705d {+20h 58m 49s} (J2000),
                 314.985d {+20h 59m 56s} (current),
                 313.795d {+20h 55m 11s} (1950)
GRB_DEC:         -53.394d {-53d 23' 36"} (J2000),
                 -53.333d {-53d 19' 57"} (current),
                 -53.588d {-53d 35' 15"} (1950)
GRB_DATE:        17189 TJD;   167 DOY;   15/06/16
GRB_TIME:        82159.26 SOD {22:49:19.26} UT
TRIGGER_INDEX:   372
GRB_PHI:         -123.23 [deg]
GRB_THETA:        40.16 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     16.384 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.91 [sigma]
IMAGE_SIGNIF:    12.26 [sigma]
LC_URL:          sw00644259000msb.lc
SUN_POSTN:        85.07d {+05h 40m 17s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.15 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       89.95d {+05h 59m 48s}  +18.46d {+18d 27' 52"}
MOON_DIST:       130.87 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      300.64,-34.61 [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 = 346.87,11.75 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:00:11 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.7156d {+20h 58m 51.74s} (J2000),
                 314.9957d {+20h 59m 58.95s} (current),
                 313.8057d {+20h 55m 13.37s} (1950)
GRB_DEC:         -53.3923d {-53d 23' 32.2"} (J2000),
                 -53.3316d {-53d 19' 53.7"} (current),
                 -53.5866d {-53d 35' 11.7"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       4.54e-09 [erg/cm2/sec]
GRB_SIGNIF:      11.95 [sigma]
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82730.16 SOD {22:58:50.16} UT,   570.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.18 261.61 243.57
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        85.08d {+05h 40m 18s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.15 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.02d {+06h 00m 04s}  +18.46d {+18d 27' 50"}
MOON_DIST:       130.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      300.65,-34.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.40 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:00:20 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.7156d {+20h 58m 51.7s} (J2000),
                 314.9957d {+20h 59m 58.9s} (current),
                 313.8057d {+20h 55m 13.3s} (1950)
GRB_DEC:         -53.3923d {-53d 23' 32.2"} (J2000),
                 -53.3316d {-53d 19' 53.7"} (current),
                 -53.5866d {-53d 35' 11.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       143 [cnts]
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82730.16 SOD {22:58:50.16} UT,   570.9 [sec] since BAT Trigger Time
CENTROID_X:      283.80,  raw= 284  [pixels]
CENTROID_Y:      287.85,  raw= 288  [pixels]
ROLL:            108.97 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -23.43
GRB_POS_XRT_Z:   -50.67
IMAGE_URL:       sw00644259000msxps_rw.img
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.15 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.02d {+06h 00m 05s}  +18.46d {+18d 27' 50"}
MOON_DIST:       130.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      300.65,-34.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:00:32 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.7156d {+20h 58m 51.7s} (J2000),
                 314.9957d {+20h 59m 58.9s} (current),
                 313.8057d {+20h 55m 13.3s} (1950)
GRB_DEC:         -53.3923d {-53d 23' 32.2"} (J2000),
                 -53.3316d {-53d 19' 53.7"} (current),
                 -53.5866d {-53d 35' 11.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       143 [cnts]
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82730.16 SOD {22:58:50.16} UT,   570.9 [sec] since BAT Trigger Time
CENTROID_X:      283.80,  raw= 284  [pixels]
CENTROID_Y:      287.85,  raw= 288  [pixels]
ROLL:            108.97 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -23.43
GRB_POS_XRT_Z:   -50.67
IMAGE_URL:       sw00644259000msxps_rw.img
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.15 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.02d {+06h 00m 05s}  +18.46d {+18d 27' 50"}
MOON_DIST:       130.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      300.65,-34.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:01:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.698d {+20h 58m 48s} (J2000)
POINT_DEC:       -53.382d {-53d 22' 53"} (J2000)
POINT_ROLL:      108.971d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82738.69 SOD {22:58:58.69} UT,   579.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.661
N_STARS:         53
X_OFFSET:        576 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1535 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00644259000msufc0579.fits
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 34"}
SUN_DIST:        132.16 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.03d {+06h 00m 08s}  +18.46d {+18d 27' 50"}
MOON_DIST:       130.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:02:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.698d {+20h 58m 48s} (J2000)
POINT_DEC:       -53.382d {-53d 22' 53"} (J2000)
POINT_ROLL:      108.971d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82738.69 SOD {22:58:58.69} UT,   579.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.661
N_STARS:         53
X_OFFSET:        576 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1535 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00644259000msufc0579.fits
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.16 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.04d {+06h 00m 10s}  +18.46d {+18d 27' 49"}
MOON_DIST:       130.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:03:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.698d {+20h 58m 48s} (J2000)
POINT_DEC:       -53.382d {-53d 22' 53"} (J2000)
ROLL:            108.971d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82738.69 SOD {22:58:58.69} UT,   579.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456188352
X_OFFSET:        918 [pixels]
Y_OFFSET:        860 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       1020
BINNING_INDEX:   1
IM_URL:          sw00644259000msuni0593.fits
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.16 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.05d {+06h 00m 11s}  +18.46d {+18d 27' 49"}
MOON_DIST:       130.93 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:03:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.698d {+20h 58m 48s} (J2000)
POINT_DEC:       -53.382d {-53d 22' 53"} (J2000)
ROLL:            108.971d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  82738.69 SOD {22:58:58.69} UT,   579.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456188352
X_OFFSET:        918 [pixels]
Y_OFFSET:        860 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       1020
BINNING_INDEX:   1
IM_URL:          sw00644259000msuni0593.fits
SUN_POSTN:        85.08d {+05h 40m 19s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.16 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.05d {+06h 00m 12s}  +18.46d {+18d 27' 49"}
MOON_DIST:       130.93 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:06:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.694d {+20h 58m 47s} (J2000)
POINT_DEC:       -53.381d {-53d 22' 52"} (J2000)
POINT_ROLL:      108.977d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83019.49 SOD {23:03:39.49} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.743
N_STARS:         61
X_OFFSET:        598 [pixels]
Y_OFFSET:        540 [pixels]
X_MAX:           1557 [pixels]
Y_MAX:           1499 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00644259000msufc0860.fits
SUN_POSTN:        85.08d {+05h 40m 20s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.17 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.08d {+06h 00m 20s}  +18.46d {+18d 27' 48"}
MOON_DIST:       130.95 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:07:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.694d {+20h 58m 47s} (J2000)
POINT_DEC:       -53.381d {-53d 22' 52"} (J2000)
POINT_ROLL:      108.977d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83019.49 SOD {23:03:39.49} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.743
N_STARS:         61
X_OFFSET:        598 [pixels]
Y_OFFSET:        540 [pixels]
X_MAX:           1557 [pixels]
Y_MAX:           1499 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00644259000msufc0860.fits
SUN_POSTN:        85.08d {+05h 40m 20s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.17 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.08d {+06h 00m 20s}  +18.46d {+18d 27' 48"}
MOON_DIST:       130.95 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:08:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.694d {+20h 58m 47s} (J2000)
POINT_DEC:       -53.381d {-53d 22' 52"} (J2000)
ROLL:            108.977d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83019.49 SOD {23:03:39.49} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456188633
X_OFFSET:        918 [pixels]
Y_OFFSET:        860 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       1020
BINNING_INDEX:   1
IM_URL:          sw00644259000msuni0874.fits
SUN_POSTN:        85.08d {+05h 40m 20s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.17 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.09d {+06h 00m 23s}  +18.46d {+18d 27' 48"}
MOON_DIST:       130.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:08:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     644259,   Seg_Num: 0
POINT_RA:        314.694d {+20h 58m 47s} (J2000)
POINT_DEC:       -53.381d {-53d 22' 52"} (J2000)
ROLL:            108.977d
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83019.49 SOD {23:03:39.49} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456188633
X_OFFSET:        918 [pixels]
Y_OFFSET:        860 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1078
Y_GRB_POS:       1020
BINNING_INDEX:   1
IM_URL:          sw00644259000msuni0874.fits
SUN_POSTN:        85.08d {+05h 40m 20s}  +23.36d {+23d 21' 35"}
SUN_DIST:        132.17 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.10d {+06h 00m 23s}  +18.46d {+18d 27' 48"}
MOON_DIST:       130.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.53,-40.24 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      300.64,-34.59 [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 #17936
A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 22:49:19 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150616A (trigger=644259). The Swift slewed to the burst after a delay due to the Earth limb constraint. The BAT on-board calculated location is RA, Dec 314.705, -53.394 which is
```
   RA(J2000) = 20h 58m 49s
   Dec(J2000) = -53d 23' 36"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 200 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 22:58:50.1 UT, 570.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 314.7156, -53.3923 which is equivalent to:
```
   RA(J2000)  = +20h 58m 51.74s
   Dec(J2000) = -53d 23' 32.3"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 23 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 4.54e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 579 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 0.04.
Burst Advocate for this burst is A. Y. Lien (amy.y.lien 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:29:14 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.7162d {+20h 58m 51.88s} (J2000),
                 314.9963d {+20h 59m 59.10s} (current),
                 313.8063d {+20h 55m 13.51s} (1950)
GRB_DEC:         -53.3930d {-53d 23' 34.8"} (J2000),
                 -53.3323d {-53d 19' 56.2"} (current),
                 -53.5873d {-53d 35' 14.3"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83140.00 SOD {23:05:40.00} UT,   980.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        85.10d {+05h 40m 24s}  +23.36d {+23d 21' 37"}
SUN_DIST:        132.16 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.30d {+06h 01m 12s}  +18.46d {+18d 27' 42"}
MOON_DIST:       131.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      300.65,-34.61 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Jun 15 23:53:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     644259,   Seg_Num: 0
GRB_RA:          314.7167d {+20h 58m 52.00s} (J2000),
                 314.9968d {+20h 59m 59.22s} (current),
                 313.8068d {+20h 55m 13.64s} (1950)
GRB_DEC:         -53.3929d {-53d 23' 34.4"} (J2000),
                 -53.3322d {-53d 19' 55.9"} (current),
                 -53.5872d {-53d 35' 13.9"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17189 TJD;   167 DOY;   15/06/16
IMG_START_TIME:  83140.00 SOD {23:05:40.00} UT,   980.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        85.12d {+05h 40m 28s}  +23.36d {+23d 21' 39"}
SUN_DIST:        132.17 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       90.53d {+06h 02m 08s}  +18.46d {+18d 27' 34"}
MOON_DIST:       131.17 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      344.51,-40.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      300.65,-34.61 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #17937
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2598 s of XRT Photon Counting mode data and 6 UVOT images for GRB 150616A, 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 = 314.71689, -53.39383 which is equivalent to:
```
RA (J2000): 20h 58m 52.05s
Dec (J2000): -53d 23' 37.8"
```
with an uncertainty of 1.4 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 #17939
K.L. Page (U. Leicester), C. Pagani (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester) and A.Y. Lien report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 150616A (Lien et al. GCN Circ. 17936), from 561 s to 31.6 ks after the BAT trigger. The data comprise 979 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 17937).
The late-time light curve (from T0+6.3 ks) can be modelled with an initial power-law decay with an index of alpha=3.785 (+0.019, -0.768), followed by a break at T+7888 s to an alpha of 0.94 (+0.14, -0.16).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.75 (+/-0.04). The best-fitting absorption column is 5.06 (+0.31, -0.30) x 10^21 cm^-2, in excess of the Galactic value of 3.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.15 (+0.10, -0.09) and a best-fitting absorption column of 4.6 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (6.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.6 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 3.4 x 10^20 cm^-2
Excess significance: 15.3 sigma
Photon index:	     2.15 (+0.10, -0.09)
```
If the light curve continues to decay with a power-law decay index of 0.94, the count rate at T+24 hours will be 0.050 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.9 x 10^-12 (3.3 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/00644259.
This circular is an official product of the Swift-XRT team.
GCN Circular #17941
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), 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 150616A (trigger #644259) (Lien, et al., GCN Circ. 17936). The BAT ground-calculated position is RA, Dec = 314.713, -53.403 deg which is
```
  RA(J2000)  =  20h 58m 51.1s
  Dec(J2000) = -53d 24' 11.3"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%.
The mask-weighted light curve shows a long multi-peaked structure that starts at ~ T-50 s and ends at ~ T+710 s. The major pulse starts at ~ T+60 s, peaks at ~ T+93 s, and ends at ~ T+140 s. There is a weak emission from the source from T-240 s to T-200 s. There may be additional low-level emission before this time that we cannot confirm nor rule out. T90 (15-350 keV) is 599.5 +- 99.3 sec (estimated error including systematics).
The time-averaged spectrum from T-52.3 to T+705.9 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.37 +- 0.25, and Epeak of 92.5 +- 45.9 keV (chi squared 55.79 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+93.58 sec in the 15-150 keV band is 2.9 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.73 +- 0.06 (chi squared 62.56 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/644259/BA/
GCN Circular #17942
S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150616A 579 s after the BAT trigger (Lien et al., GCN Circ. 17936). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 17937) 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           579          729          147         >21.0
white              579         7913          616         >21.8
v                  736         2624          214         >19.6
b                  836         2878          365         >20.5
u                  810         2700          214         >20.5
w1                 786         2674          214         >20.2
m2                 760         2649          136         >19.9
w2                1016         2250          156         >20.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17947
D. Murphy (UCD), A. Martin-Carrillo (UCD), M. Topinka (CTU), L. Hanlon (UCD), H. J. van Heerden (UFS), B. van Soelen (UFS) and P. J. Meintjes (UFS):
We observed the field of GRB 150616A (Lien et al., GCN Circ. #17936) using the 40cm Watcher telescope at Boyden Observatory in South Africa.
Observations started at 22:52:09 UT, 170 seconds after the burst trigger. A series of 5 sec images were taken in the SDSS r' filter using an Andor CCD camera. No credible afterglow is found in any of the individual images at the enhanced XRT location (Evans et al., GCN Circ. #17937). A 3sigma upper limit for a combined 50 second exposure is given below.
```
Start             | End              | Exposure | Filter | Magnitude
-------------------------------------------------------------------------------------------------
22:52:09 UT | 22:53:15 UT | 10x5 sec |  r'       |  >18.9 (3sigma upper limit)
```
The upper limit was calculated using nearby stars from the APASS catalogue.
This message can be cited in publications.

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Jochen Greiner, last update: 18-Jun-2015 [Disclaimer]