Gamma-ray Burst 160824A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:23:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.078d {+05h 20m 19s} (J2000),
                  80.368d {+05h 21m 28s} (current),
                  79.207d {+05h 16m 50s} (1950)
GRB_DEC:         +40.040d {+40d 02' 25"} (J2000),
                 +40.056d {+40d 03' 22"} (current),
                 +39.990d {+39d 59' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5505 [cnts]    Image_Peak=236 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   486     E_range: 50-350 keV
BKG_INTEN:       48011 [cnts]
BKG_TIME:        84111.24 SOD {23:21:51.24} UT
BKG_DUR:         24 [sec]
GRB_DATE:        17624 TJD;   237 DOY;   16/08/24
GRB_TIME:        84145.35 SOD {23:22:25.35} UT
GRB_PHI:          35.17 [deg]
GRB_THETA:        31.09 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.43 [sigma]
IMAGE_SIGNIF:    8.84 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +3  -1  +0  +1 -32  +0 
SUN_POSTN:       154.19d {+10h 16m 46s}  +10.69d {+10d 41' 16"}
SUN_DIST:         70.80 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.74d {+03h 54m 58s}  +15.08d {+15d 04' 41"}
MOON_DIST:        31.30 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.86,  1.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       82.08, 16.87 [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 = 147.49,19.09 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:24:29 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.0873d {+05h 20m 20.95s} (J2000),
                  80.3773d {+05h 21m 30.56s} (current),
                  79.2169d {+05h 16m 52.06s} (1950)
GRB_DEC:         +40.0283d {+40d 01' 41.8"} (J2000),
                 +40.0440d {+40d 02' 38.4"} (current),
                 +39.9783d {+39d 58' 41.8"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.04e-08 [erg/cm2/sec]
GRB_SIGNIF:      14.17 [sigma]
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84236.53 SOD {23:23:56.53} UT,   91.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.20 261.63 243.56
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       154.19d {+10h 16m 46s}  +10.69d {+10d 41' 15"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.76d {+03h 55m 02s}  +15.08d {+15d 04' 51"}
MOON_DIST:        31.29 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.69 [deg] galactic lon,lat of the burst
ECL_COORDS:       82.08, 16.86 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.85 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:     Wed 24 Aug 16 23:24:39 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.0873d {+05h 20m 20.9s} (J2000),
                  80.3773d {+05h 21m 30.5s} (current),
                  79.2169d {+05h 16m 52.0s} (1950)
GRB_DEC:         +40.0283d {+40d 01' 41.8"} (J2000),
                 +40.0440d {+40d 02' 38.4"} (current),
                 +39.9783d {+39d 58' 41.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       201 [cnts]
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84236.53 SOD {23:23:56.53} UT,   91.2 [sec] since BAT Trigger Time
CENTROID_X:      329.96,  raw= 330  [pixels]
CENTROID_Y:      278.59,  raw= 279  [pixels]
ROLL:            91.89 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -45.26
GRB_POS_XRT_Z:   58.14
IMAGE_URL:       sw00709765000msxps_rw.img
SUN_POSTN:       154.19d {+10h 16m 46s}  +10.69d {+10d 41' 15"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.76d {+03h 55m 02s}  +15.08d {+15d 04' 52"}
MOON_DIST:        31.29 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.69 [deg] galactic lon,lat of the burst
ECL_COORDS:       82.08, 16.86 [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:     Wed 24 Aug 16 23:24:47 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.0873d {+05h 20m 20.9s} (J2000),
                  80.3773d {+05h 21m 30.5s} (current),
                  79.2169d {+05h 16m 52.0s} (1950)
GRB_DEC:         +40.0283d {+40d 01' 41.8"} (J2000),
                 +40.0440d {+40d 02' 38.4"} (current),
                 +39.9783d {+39d 58' 41.8"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       201 [cnts]
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84236.53 SOD {23:23:56.53} UT,   91.2 [sec] since BAT Trigger Time
CENTROID_X:      329.96,  raw= 330  [pixels]
CENTROID_Y:      278.59,  raw= 279  [pixels]
ROLL:            91.89 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -45.26
GRB_POS_XRT_Z:   58.14
IMAGE_URL:       sw00709765000msxps_rw.img
SUN_POSTN:       154.19d {+10h 16m 46s}  +10.69d {+10d 41' 14"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.76d {+03h 55m 03s}  +15.08d {+15d 04' 53"}
MOON_DIST:        31.28 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.69 [deg] galactic lon,lat of the burst
ECL_COORDS:       82.08, 16.86 [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:     Wed 24 Aug 16 23:26:27 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.078d {+05h 20m 19s} (J2000),
                  80.368d {+05h 21m 28s} (current),
                  79.207d {+05h 16m 50s} (1950)
GRB_DEC:         +40.040d {+40d 02' 25"} (J2000),
                 +40.056d {+40d 03' 22"} (current),
                 +39.990d {+39d 59' 25"} (1950)
GRB_DATE:        17624 TJD;   237 DOY;   16/08/24
GRB_TIME:        84145.35 SOD {23:22:25.35} UT
TRIGGER_INDEX:   486
GRB_PHI:          35.17 [deg]
GRB_THETA:        31.09 [deg]
DELTA_TIME:      -51.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.43 [sigma]
IMAGE_SIGNIF:    8.84 [sigma]
LC_URL:          sw00709765000msb.lc
SUN_POSTN:       154.19d {+10h 16m 46s}  +10.69d {+10d 41' 13"}
SUN_DIST:         70.80 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.78d {+03h 55m 07s}  +15.08d {+15d 05' 04"}
MOON_DIST:        31.28 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.86,  1.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       82.08, 16.87 [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 = 147.49,19.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:28:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.109d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.040d {+40d 02' 23"} (J2000)
POINT_ROLL:      91.891d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84246.37 SOD {23:24:06.37} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.370
N_STARS:         165
X_OFFSET:        328 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1287 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    11
SL_URL:          sw00709765000msufc0101.fits
SUN_POSTN:       154.19d {+10h 16m 47s}  +10.69d {+10d 41' 11"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.80d {+03h 55m 11s}  +15.09d {+15d 05' 17"}
MOON_DIST:        31.28 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:28:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.109d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.040d {+40d 02' 23"} (J2000)
POINT_ROLL:      91.891d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84246.37 SOD {23:24:06.37} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.370
N_STARS:         165
X_OFFSET:        328 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1287 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    11
SL_URL:          sw00709765000msufc0101.fits
SUN_POSTN:       154.19d {+10h 16m 47s}  +10.69d {+10d 41' 11"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.80d {+03h 55m 12s}  +15.09d {+15d 05' 20"}
MOON_DIST:        31.28 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:30:31 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.109d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.040d {+40d 02' 23"} (J2000)
ROLL:            91.891d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84246.37 SOD {23:24:06.37} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     493773863
X_OFFSET:        738 [pixels]
Y_OFFSET:        1022 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       898
Y_GRB_POS:       1182
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0118.fits
SUN_POSTN:       154.20d {+10h 16m 47s}  +10.69d {+10d 41' 10"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.82d {+03h 55m 16s}  +15.09d {+15d 05' 30"}
MOON_DIST:        31.27 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:30:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.109d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.040d {+40d 02' 23"} (J2000)
ROLL:            91.891d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84246.37 SOD {23:24:06.37} UT,   101.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     493773863
X_OFFSET:        738 [pixels]
Y_OFFSET:        1022 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       898
Y_GRB_POS:       1182
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0118.fits
SUN_POSTN:       154.20d {+10h 16m 47s}  +10.69d {+10d 41' 09"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.82d {+03h 55m 17s}  +15.09d {+15d 05' 33"}
MOON_DIST:        31.26 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:37:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
POINT_ROLL:      91.893d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84458.68 SOD {23:27:38.68} UT,   313.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.225
N_STARS:         85
X_OFFSET:        418 [pixels]
Y_OFFSET:        702 [pixels]
X_MAX:           1377 [pixels]
Y_MAX:           1661 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00709765000msufc0313.fits
SUN_POSTN:       154.20d {+10h 16m 48s}  +10.68d {+10d 41' 04"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.89d {+03h 55m 33s}  +15.10d {+15d 06' 15"}
MOON_DIST:        31.22 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:37:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
POINT_ROLL:      91.893d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84458.68 SOD {23:27:38.68} UT,   313.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.225
N_STARS:         85
X_OFFSET:        418 [pixels]
Y_OFFSET:        702 [pixels]
X_MAX:           1377 [pixels]
Y_MAX:           1661 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00709765000msufc0313.fits
SUN_POSTN:       154.20d {+10h 16m 48s}  +10.68d {+10d 41' 03"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.89d {+03h 55m 34s}  +15.10d {+15d 06' 17"}
MOON_DIST:        31.22 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:38:00 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     709765,   Seg_Num: 0
GRB_RA:           80.0876d {+05h 20m 21.02s} (J2000),
                  80.3776d {+05h 21m 30.63s} (current),
                  79.2172d {+05h 16m 52.13s} (1950)
GRB_DEC:         +40.0285d {+40d 01' 42.6"} (J2000),
                 +40.0442d {+40d 02' 39.2"} (current),
                 +39.9785d {+39d 58' 42.5"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84352.00 SOD {23:25:52.00} UT,   206.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       154.20d {+10h 16m 48s}  +10.68d {+10d 41' 03"}
SUN_DIST:         70.80 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.89d {+03h 55m 34s}  +15.11d {+15d 06' 19"}
MOON_DIST:        31.20 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.69 [deg] galactic lon,lat of the burst
ECL_COORDS:       82.08, 16.86 [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:     Wed 24 Aug 16 23:38:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
ROLL:            91.893d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84458.68 SOD {23:27:38.68} UT,   313.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     493774075
X_OFFSET:        738 [pixels]
Y_OFFSET:        1022 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       898
Y_GRB_POS:       1182
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0330.fits
SUN_POSTN:       154.20d {+10h 16m 48s}  +10.68d {+10d 41' 02"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.90d {+03h 55m 36s}  +15.11d {+15d 06' 24"}
MOON_DIST:        31.21 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:38:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
ROLL:            91.893d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  84458.68 SOD {23:27:38.68} UT,   313.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     493774075
X_OFFSET:        738 [pixels]
Y_OFFSET:        1022 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       898
Y_GRB_POS:       1182
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0330.fits
SUN_POSTN:       154.20d {+10h 16m 48s}  +10.68d {+10d 41' 02"}
SUN_DIST:         70.78 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.90d {+03h 55m 37s}  +15.11d {+15d 06' 25"}
MOON_DIST:        31.21 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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 #19855
P.A. Evans (U Leicester), S. B. Cenko (GSFC), H. A. Krimm (CRESST/GSFC/USRA), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 23:22:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160824A (trigger=709765). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 80.078, +40.040 which is
```
   RA(J2000) = 05h 20m 19s
   Dec(J2000) = +40d 02' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 sec. The peak count rate was ~2100 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 23:23:56.5 UT, 91.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 80.0877, 40.0286 which is equivalent to:
```
   RA(J2000)  = 05h 20m 21.05s
   Dec(J2000) = +40d 01' 43.1"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 48 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (6.32 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 4.7 (+6.16/-4.59) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.04e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 101 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.
Burst Advocate for this burst is P.A. Evans (pae9 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:43:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
POINT_ROLL:      91.892d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  85015.32 SOD {23:36:55.32} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.963
N_STARS:         190
X_OFFSET:        178 [pixels]
Y_OFFSET:        462 [pixels]
X_MAX:           1617 [pixels]
Y_MAX:           1901 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00709765000msufc0869.fits
SUN_POSTN:       154.20d {+10h 16m 49s}  +10.68d {+10d 40' 58"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.95d {+03h 55m 47s}  +15.11d {+15d 06' 54"}
MOON_DIST:        31.18 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 24 Aug 16 23:43:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
POINT_ROLL:      91.892d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  85015.32 SOD {23:36:55.32} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.963
N_STARS:         190
X_OFFSET:        178 [pixels]
Y_OFFSET:        462 [pixels]
X_MAX:           1617 [pixels]
Y_MAX:           1901 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00709765000msufc0869.fits
SUN_POSTN:       154.20d {+10h 16m 49s}  +10.68d {+10d 40' 58"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.95d {+03h 55m 48s}  +15.12d {+15d 06' 57"}
MOON_DIST:        31.18 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:45:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
ROLL:            91.892d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  85015.32 SOD {23:36:55.32} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     493774632
X_OFFSET:        737 [pixels]
Y_OFFSET:        1021 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       897
Y_GRB_POS:       1181
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0886.fits
SUN_POSTN:       154.21d {+10h 16m 49s}  +10.68d {+10d 40' 56"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.97d {+03h 55m 53s}  +15.12d {+15d 07' 09"}
MOON_DIST:        31.17 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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:     Wed 24 Aug 16 23:46:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     709765,   Seg_Num: 0
POINT_RA:         80.110d {+05h 20m 26s} (J2000)
POINT_DEC:       +40.042d {+40d 02' 30"} (J2000)
ROLL:            91.892d
IMG_START_DATE:  17624 TJD;   237 DOY;   16/08/24
IMG_START_TIME:  85015.32 SOD {23:36:55.32} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     493774632
X_OFFSET:        737 [pixels]
Y_OFFSET:        1021 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       897
Y_GRB_POS:       1181
BINNING_INDEX:   1
IM_URL:          sw00709765000msuni0886.fits
SUN_POSTN:       154.21d {+10h 16m 49s}  +10.68d {+10d 40' 56"}
SUN_DIST:         70.79 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:       58.97d {+03h 55m 53s}  +15.12d {+15d 07' 11"}
MOON_DIST:        31.16 [deg]
MOON_ILLUM:      52 [%]
GAL_COORDS:      167.87,  1.71 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       82.10, 16.87 [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 #19857
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 2198 s of XRT Photon Counting mode data and 5 UVOT images for GRB 160824A, 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 = 80.08758, +40.02826 which is equivalent to:
```
RA (J2000): 05h 20m 21.02s
Dec (J2000): +40d 01' 41.7"
```
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 #19858
B. Mingo (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 160824A (Evans et al. GCN Circ. 19855), from 81 s to 29.6 ks after the BAT trigger. The data comprise 105 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 Goad et al. (GCN Circ. 19857).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.33 (+0.17, -0.18). At T+258 s the decay flattens to an alpha of 0.44 (+0.05, -0.06) before breaking again at T+7762 s to a final decay with index alpha=1.31 (+/-0.14).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.07 (+/-0.10). The best-fitting absorption column is 1.18 (+0.11, -0.10) x 10^22 cm^-2, in excess of the Galactic value of 6.3 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.96 (+/-0.13) and a best-fitting absorption column of 1.05 (+0.14, -0.13) x 10^22 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.0 x 10^-11 (9.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.05 (+0.14, -0.13) x 10^22 cm^-2
Galactic foreground: 6.3 x 10^21 cm^-2
Excess significance: 5.3 sigma
Photon index:	     1.96 (+/-0.13)
```
If the light curve continues to decay with a power-law decay index of 1.31, the count rate at T+24 hours will be 0.018 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.8 x 10^-13 (1.6 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/00709765.
This circular is an official product of the Swift-XRT team.
GCN Circular #19859
U.Quadri, L.Strabla and R.Girelli report:
We imaged the field of GRB 160824A detected by SWIFT(trigger 709765) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. Member of: AAVSO - American Association of Variable Star Observers. ISSP - Italian Supernovae Search Project. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
The observations started 20.77 min after the GRB trigger, with our Schmidt telescope D=320/400 mm F/D=3.1.
Weather conditions not good for Moon proximity.
We co-added 4 series of 20 exposures of 120 sec each.
```
Start T0+      End T0+      CVlim
20.77 min    196.52 min     17.5
```
We did not found any optical counterpart in the error box of the XRTcandidate. P.A. Evans (U Leicester), S. B. Cenko (GSFC), et al.
Magnitudes were estimated with the UCAC4 cat. and are not corrected for galactic dust extinction.
Reference: http://www.osservatoriobassano.org/GRB.asp
The message may be cited.
GCN Circular #19860
F. E. Marshall (NASA/GSFC) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160824A 101 s after the BAT trigger (Evans et al., GCN Circ. 19855). UVOT marginally detects a source consistent with the enhanced XRT position (Goad et al. GCN Circ. 19857) in the initial UVOT exposure with the white filter.
The preliminary analysis produces the following marginal detection and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373):
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              101          787          186         20.16 +/- 0.27
v                  645          837           39        >17.9
b                  571          763           39        >18.7
u                  313          738          265        >19.7
w1                 694          714           19        >18.5
m2                 669          861           39        >19.2
w2                 620          813           39        >18.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.69 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #19861
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), P.A. Evans (U Leicester), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160824A (trigger #709765) (Evans, et al., GCN Circ. 19855). The BAT ground-calculated position is RA, Dec = 80.087, 40.039 deg which is
```
    RA(J2000)  =  05h 20m 20.8s
    Dec(J2000) = +40d 02' 21.6"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%.
The mask-weighted light curve shows two episodes of emission. The first runs from T-5 sec to roughly T+45 sec and contains multiple peaks. The second runs from T+85 sec to T+110 sec. T90 (15-350 keV) is 99.3 +- 7.8 sec (estimated error including systematics).
The time-averaged spectrum from TTBD to TTBD sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.11. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.88 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/709765/BA/
GCN Circular #19862
E. Mazaeva (IKI), A. Mokhnatkin (KIAM), A. Volnova (IKI), Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration
We observed the field of GRB 160824A (Evans et al., GCN 19855) with K-800 (0.8m f/2.9) telescope of ISON/Terskol observatory. We obtained several unfiltered images starting on August 24 (UT) 23:58:36. We detected optical source in coordinates (J2000) 05:20:21.18 +40:01:43.5 with uncertainty of 1 arcsec in both coordinates. This is 2.6 arcsec apart of the center of the enhanced XRT error circle (Goad et al., GCN 19857). At this time we cannot say nothing about variability of the object. It is not clear whether our source is the same as the source reported by Marshall et al. (GCN 19860). Preliminary photometry of a combined image is following
```
Date               UT start   t-T0       Filter   Exp.   OT    Err.  UL
                       (mid, days)    (s)

2016-08-24 23:58:36 0.02758 CR      400    20.6   0.3  20.9
```
Photometry is based on nearby USNO-B1.0 stars
```
USNO-B1.0_id    R2
1300-0122742    18.17
1300-0122665    18.04
1300-0122653    18.66
1300-0122680    17.00
1300-0122864    17.60
1299-0128308    18.00
1300-0122784    17.56
```
GCN Circular #19863
Y. Hu, A. Sota and A.J. Castro-Tirado (IAA-CSIC Granada), on behalf of a larger collaboration, report:
Following the detection of GRB 160824A by Swift (Evans et al. GCNC 19855), optical images in the I-band were obtained at the 1.5m OSN telescope in Granada (Spain) starting at 01:25 (Aug 25), i.e. 2.05 h postburst. No optical afterglow is detected in the co-added image (13 x 300s, mid time 02:00 UT, 2.6 h after the trigger) within the enhanced Swift/XRT error box (Goad et al. GCNC 19857) down to I = 20.0.
GCN Circular #19899
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, C. Rumsey, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 160824A (Evans et al., GCN 19855) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Aug 25.11, Aug 26.27, Aug 28.29, and Sep 01.29 (UT) do not reveal any radio source at the XRT location (Goad et al., GCN 19857), with 3sigma upper limits of 444 uJy, 126 uJy, 117 uJy, and 117 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 06-Sep-2016 [Disclaimer]