Gamma-ray Burst 150720A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:03:27 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.582d {+07h 58m 20s} (J2000),
                 119.741d {+07h 58m 58s} (current),
                 119.072d {+07h 56m 17s} (1950)
GRB_DEC:         -28.301d {-28d 18' 02"} (J2000),
                 -28.344d {-28d 20' 36"} (current),
                 -28.165d {-28d 09' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1323 [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:        17223 TJD;   201 DOY;   15/07/20
GRB_TIME:        50529.12 SOD {14:02:09.12} UT
GRB_PHI:         -168.68 [deg]
GRB_THETA:        16.95 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.55 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -2  +0  +1 -65  +0 
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 51"}
SUN_DIST:         48.99 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.02d {+11h 16m 04s}   +3.42d {+03d 25' 27"}
MOON_DIST:        56.99 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.45,  0.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.22,-47.69 [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 = 330.34,9.73 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:04:52 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.5817d {+07h 58m 19.60s} (J2000),
                 119.7404d {+07h 58m 57.70s} (current),
                 119.0713d {+07h 56m 17.11s} (1950)
GRB_DEC:         -28.2621d {-28d 15' 43.5"} (J2000),
                 -28.3049d {-28d 18' 17.7"} (current),
                 -28.1257d {-28d 07' 32.6"} (1950)
GRB_ERROR:       5.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.93e-08 [erg/cm2/sec]
GRB_SIGNIF:      7.00 [sigma]
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50663.70 SOD {14:04:23.70} UT,   134.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.17 261.52 243.52
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 51"}
SUN_DIST:         48.95 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.03d {+11h 16m 06s}   +3.42d {+03d 25' 14"}
MOON_DIST:        56.98 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.41,  0.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.21,-47.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.32 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:05:02 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.5817d {+07h 58m 19.6s} (J2000),
                 119.7404d {+07h 58m 57.7s} (current),
                 119.0713d {+07h 56m 17.1s} (1950)
GRB_DEC:         -28.2621d {-28d 15' 43.5"} (J2000),
                 -28.3049d {-28d 18' 17.7"} (current),
                 -28.1257d {-28d 07' 32.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       49 [cnts]
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50663.70 SOD {14:04:23.70} UT,   134.6 [sec] since BAT Trigger Time
CENTROID_X:      219.76,  raw= 220  [pixels]
CENTROID_Y:      309.04,  raw= 309  [pixels]
ROLL:            0.03 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   26.49
GRB_POS_XRT_Z:   -201.64
IMAGE_URL:       sw00649706000msxps_rw.img
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 51"}
SUN_DIST:         48.95 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.03d {+11h 16m 07s}   +3.42d {+03d 25' 12"}
MOON_DIST:        56.98 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.41,  0.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.21,-47.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:05:21 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.5817d {+07h 58m 19.6s} (J2000),
                 119.7404d {+07h 58m 57.7s} (current),
                 119.0713d {+07h 56m 17.1s} (1950)
GRB_DEC:         -28.2621d {-28d 15' 43.5"} (J2000),
                 -28.3049d {-28d 18' 17.7"} (current),
                 -28.1257d {-28d 07' 32.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       49 [cnts]
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50663.70 SOD {14:04:23.70} UT,   134.6 [sec] since BAT Trigger Time
CENTROID_X:      219.76,  raw= 220  [pixels]
CENTROID_Y:      309.04,  raw= 309  [pixels]
ROLL:            0.03 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   26.49
GRB_POS_XRT_Z:   -201.64
IMAGE_URL:       sw00649706000msxps_rw.img
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 50"}
SUN_DIST:         48.95 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.03d {+11h 16m 07s}   +3.42d {+03d 25' 09"}
MOON_DIST:        56.98 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.41,  0.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.21,-47.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:06:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.582d {+07h 58m 20s} (J2000),
                 119.741d {+07h 58m 58s} (current),
                 119.072d {+07h 56m 17s} (1950)
GRB_DEC:         -28.301d {-28d 18' 02"} (J2000),
                 -28.344d {-28d 20' 36"} (current),
                 -28.165d {-28d 09' 51"} (1950)
GRB_DATE:        17223 TJD;   201 DOY;   15/07/20
GRB_TIME:        50529.12 SOD {14:02:09.12} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -168.68 [deg]
GRB_THETA:        16.95 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.55 [sigma]
LC_URL:          sw00649706000msb.lc
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 50"}
SUN_DIST:         48.99 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.04d {+11h 16m 09s}   +3.42d {+03d 25' 02"}
MOON_DIST:        57.00 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.45,  0.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      130.22,-47.69 [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 = 330.34,9.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:08:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.588d {+07h 58m 21s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 03"} (J2000)
POINT_ROLL:      0.029d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50671.55 SOD {14:04:31.55} UT,   142.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.698
N_STARS:         190
X_OFFSET:        568 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1527 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00649706000msufc0142.fits
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 49"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.05d {+11h 16m 13s}   +3.41d {+03d 24' 41"}
MOON_DIST:        57.01 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:09:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.588d {+07h 58m 21s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 03"} (J2000)
POINT_ROLL:      0.029d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50671.55 SOD {14:04:31.55} UT,   142.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.698
N_STARS:         190
X_OFFSET:        568 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1527 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00649706000msufc0142.fits
SUN_POSTN:       119.63d {+07h 58m 31s}  +20.65d {+20d 38' 49"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.06d {+11h 16m 14s}   +3.41d {+03d 24' 35"}
MOON_DIST:        57.01 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:10:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.588d {+07h 58m 21s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 03"} (J2000)
ROLL:            0.029d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50671.55 SOD {14:04:31.55} UT,   142.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     459093886
X_OFFSET:        1125 [pixels]
Y_OFFSET:        633 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1285
Y_GRB_POS:       793
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0157.fits
SUN_POSTN:       119.63d {+07h 58m 32s}  +20.65d {+20d 38' 48"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.07d {+11h 16m 17s}   +3.41d {+03d 24' 23"}
MOON_DIST:        57.02 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [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:     Mon 20 Jul 15 14:10:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.588d {+07h 58m 21s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 03"} (J2000)
ROLL:            0.029d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50671.55 SOD {14:04:31.55} UT,   142.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     459093886
X_OFFSET:        1125 [pixels]
Y_OFFSET:        633 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1285
Y_GRB_POS:       793
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0157.fits
SUN_POSTN:       119.63d {+07h 58m 32s}  +20.65d {+20d 38' 48"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.07d {+11h 16m 16s}   +3.41d {+03d 24' 26"}
MOON_DIST:        57.02 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [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:     Mon 20 Jul 15 14:14:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
POINT_ROLL:      0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50830.37 SOD {14:07:10.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.538
N_STARS:         190
X_OFFSET:        805 [pixels]
Y_OFFSET:        313 [pixels]
X_MAX:           1764 [pixels]
Y_MAX:           1272 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00649706000msufc0301.fits
SUN_POSTN:       119.64d {+07h 58m 32s}  +20.65d {+20d 38' 46"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.10d {+11h 16m 25s}   +3.39d {+03d 23' 41"}
MOON_DIST:        57.04 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:15:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
POINT_ROLL:      0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50830.37 SOD {14:07:10.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.538
N_STARS:         190
X_OFFSET:        805 [pixels]
Y_OFFSET:        313 [pixels]
X_MAX:           1764 [pixels]
Y_MAX:           1272 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00649706000msufc0301.fits
SUN_POSTN:       119.64d {+07h 58m 32s}  +20.65d {+20d 38' 46"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.11d {+11h 16m 26s}   +3.39d {+03d 23' 37"}
MOON_DIST:        57.04 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:15:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     649706,   Seg_Num: 0
GRB_RA:          119.5810d {+07h 58m 19.44s} (J2000),
                 119.7397d {+07h 58m 57.53s} (current),
                 119.0706d {+07h 56m 16.94s} (1950)
GRB_DEC:         -28.2622d {-28d 15' 43.9"} (J2000),
                 -28.3050d {-28d 18' 18.1"} (current),
                 -28.1258d {-28d 07' 33.0"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50769.00 SOD {14:06:09.00} UT,   239.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       119.64d {+07h 58m 33s}  +20.65d {+20d 38' 46"}
SUN_DIST:         48.95 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.11d {+11h 16m 26s}   +3.39d {+03d 23' 36"}
MOON_DIST:        57.03 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.41,  0.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      130.21,-47.66 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:16:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
ROLL:            0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50830.37 SOD {14:07:10.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     459094045
X_OFFSET:        1125 [pixels]
Y_OFFSET:        633 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1285
Y_GRB_POS:       793
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0316.fits
SUN_POSTN:       119.64d {+07h 58m 33s}  +20.65d {+20d 38' 45"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.12d {+11h 16m 28s}   +3.39d {+03d 23' 26"}
MOON_DIST:        57.05 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [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:     Mon 20 Jul 15 14:16:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
ROLL:            0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  50830.37 SOD {14:07:10.37} UT,   301.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     459094045
X_OFFSET:        1125 [pixels]
Y_OFFSET:        633 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1285
Y_GRB_POS:       793
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0316.fits
SUN_POSTN:       119.64d {+07h 58m 33s}  +20.65d {+20d 38' 45"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.12d {+11h 16m 29s}   +3.39d {+03d 23' 24"}
MOON_DIST:        57.05 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [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:     Mon 20 Jul 15 14:21:40 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
POINT_ROLL:      0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  51408.13 SOD {14:16:48.13} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.379
N_STARS:         190
X_OFFSET:        565 [pixels]
Y_OFFSET:        73 [pixels]
X_MAX:           2004 [pixels]
Y_MAX:           1512 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    11
SL_URL:          sw00649706000msufc0879.fits
SUN_POSTN:       119.64d {+07h 58m 34s}  +20.65d {+20d 38' 43"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.16d {+11h 16m 38s}   +3.38d {+03d 22' 38"}
MOON_DIST:        57.07 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:21:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
POINT_ROLL:      0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  51408.13 SOD {14:16:48.13} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.379
N_STARS:         190
X_OFFSET:        565 [pixels]
Y_OFFSET:        73 [pixels]
X_MAX:           2004 [pixels]
Y_MAX:           1512 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    11
SL_URL:          sw00649706000msufc0879.fits
SUN_POSTN:       119.64d {+07h 58m 34s}  +20.65d {+20d 38' 43"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.16d {+11h 16m 38s}   +3.38d {+03d 22' 36"}
MOON_DIST:        57.07 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:23:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
ROLL:            0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  51408.13 SOD {14:16:48.13} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     459094623
X_OFFSET:        1124 [pixels]
Y_OFFSET:        632 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1284
Y_GRB_POS:       792
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0894.fits
SUN_POSTN:       119.64d {+07h 58m 34s}  +20.65d {+20d 38' 42"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.17d {+11h 16m 41s}   +3.37d {+03d 22' 25"}
MOON_DIST:        57.08 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 20 Jul 15 14:23:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     649706,   Seg_Num: 0
POINT_RA:        119.590d {+07h 58m 22s} (J2000)
POINT_DEC:       -28.318d {-28d 19' 05"} (J2000)
ROLL:            0.026d
IMG_START_DATE:  17223 TJD;   201 DOY;   15/07/20
IMG_START_TIME:  51408.13 SOD {14:16:48.13} UT,   879.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     459094623
X_OFFSET:        1124 [pixels]
Y_OFFSET:        632 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1284
Y_GRB_POS:       792
BINNING_INDEX:   1
IM_URL:          sw00649706000msuni0894.fits
SUN_POSTN:       119.64d {+07h 58m 34s}  +20.64d {+20d 38' 42"}
SUN_DIST:         49.01 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      169.17d {+11h 16m 41s}   +3.37d {+03d 22' 22"}
MOON_DIST:        57.08 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.46,  0.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      130.24,-47.71 [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 #18037
E. Sonbas (NASA/GSFC/Adiyaman Univ.), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. B. Cenko (GSFC), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), S. L. Gibson (U Leicester), L. Izzo (URoma/ICRA), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 14:02:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located possible GRB 150720A (trigger=649706). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 119.582, -28.301, which is
```
   RA(J2000)  =  07h 58m 20s
   Dec(J2000) = -28d 18' 02"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image trigger (64-sec), there is nothing significant in the real-time TDRSS light curve.
The XRT began observing the field at 14:04:23.7 UT, 134.6 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 119.5810, -28.2623 which is equivalent to:
```
   RA(J2000)  = 07h 58m 19.45s
   Dec(J2000) = -28d 15' 44.2"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 139 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 5.72 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 0.1 s image was 2.93e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 142 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain extinction expected.
The event is near the galactic plane (l=245, b=0.5) and has a rapid decrease in X-ray afterglow. Also, it was a faint image trigger in BAT but very bright in X-rays. We can not rule out that the source is a galactic transient instead of a gamma-ray burst.
Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #18038
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), E. Sonbas (NASA/GSFC/Adiyaman Univ.), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-30 to T+273 sec from recent telemetry downlinks, we report further analysis of BAT GRB 150720A (trigger #649706) (Sonbas, et al., GCN Circ. 18037). The BAT ground-calculated position is RA, Dec = 119.577, -28.281 deg, which is
```
   RA(J2000)  =   07h 58m  18.5s
   Dec(J2000) =  -28d 16'  50"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows 3 peaks starting at T-30 sec and the emission ending at ~T+130 sec. T90 (15-350 keV) is 151 +- 11 sec (estimated error including systematics).
The time-averaged spectrum from T-35.1 to T+126.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.61 +- 0.33. The fluence in the 15-150 keV band is 5.6 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+116.68 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/649706/BA/
We note that this has a soft spectrum (in the bottom ~10-percentile of the BAT hardness range) and that the Galactic lattitude is 0.5deg, so we can not rule out a non-GRB Galactic source origin for this event.
GCN Circular #18039
V. D'Elia (ASDC), L. Izzo (URoma/ICRA), K. Page (U Leicester) and E. Sonbas (NASA/GSFC/Adiyaman Univ.) report on behalf of the Swift-XRT team:
We have analysed 11 ks of XRT data for the possible GRB 150720A (Sonbas et al. GCN Circ. 18037), from 138 s to 40 ks after the BAT trigger. The data comprise 96 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 119.58144, -28.26249 which is equivalent to:
```
RA (J2000): 07 58 19.55
Dec(J2000): -28 15 45.0
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
The late time light curve can be modelled with a power-law decay with a decay index of alpha ~ 1.5.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 3.16 (+0.10, -0.10). The best-fitting absorption column is 3.1 (+0.6, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 5.72 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.7 x 10^-11 (1.6 x 10^-10) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     8.8 (+0.6, -0.6) x 10^21 cm^-2
Galactic foreground: 5.72 x 10^21 cm^-2
Excess significance: 5.1 sigma
Photon index:	     3.16 (+0.10, -0.10)
```
If the light curve continues to decay with a power-law decay index of 1.5, the count rate at T+24 hours will be 1.8 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.9 x 10^-14 (2.9 x 10^-13) erg cm^-2 s^-1.
Given the light curve and spectrum behaviour, we believe that this is a real GRB and not a galactic transient.
This circular is an official product of the Swift-XRT team.
GCN Circular #18040
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 653 s of XRT Photon Counting mode data and 2 UVOT images for GRB 150720A, 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 = 119.58146, -28.26251 which is equivalent to:
```
RA (J2000): 07h 58m 19.55s
Dec (J2000): -28d 15' 45.0"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #18045
M. H. Siegel (PSU) and E. Sonbas (NASA/GSFC/Adiyaman Univ.) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150720 142 s after the BAT trigger (Sonbas et al., GCN Circ. 18037). No optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ. 18040) 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)         142          292          147         >20.5
u (fc)             301          551          246         >20.4
white              142         1551          392         >21.2
v                  631         1601          117         >19.3
b                  557         1527           97         >19.6
u                  301         1502          324         >20.2
w1                 680         1478           97         >19.3
m2                 655         1623          114         >19.8
w2                 606         1577          117         >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.68 in the direction of the burst (Schlegel et al. 1998).

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