Gamma-ray Burst 170711A

(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 11 Jul 17 22:20:46 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     761622,   Seg_Num: 0
GRB_RA:           45.786d {+03h 03m 09s} (J2000),
                  46.088d {+03h 04m 21s} (current),
                  44.928d {+02h 59m 43s} (1950)
GRB_DEC:         +47.850d {+47d 51' 01"} (J2000),
                 +47.918d {+47d 55' 05"} (current),
                 +47.655d {+47d 39' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7255 [cnts]    Image_Peak=1030 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       23561 [cnts]
BKG_TIME:        80412.64 SOD {22:20:12.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17945 TJD;   192 DOY;   17/07/11
GRB_TIME:        80425.38 SOD {22:20:25.38} UT
GRB_PHI:         -11.36 [deg]
GRB_THETA:        11.77 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     72.53 [sigma]
IMAGE_SIGNIF:    21.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  +7  +0  +1 -53  +0 
SUN_POSTN:       111.42d {+07h 25m 40s}  +21.98d {+21d 58' 38"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.22d {+21h 32m 53s}  -14.18d {-14d 10' 33"}
MOON_DIST:        95.80 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.56, 29.27 [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 = 125.87,19.26 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=521504430).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:21:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     521504430
GRB_RA:           53.220d {+03h 32m 53s} (J2000),
                  53.547d {+03h 34m 11s} (current),
                  52.292d {+03h 29m 10s} (1950)
GRB_DEC:         +52.480d {+52d 28' 48"} (J2000),
                 +52.538d {+52d 32' 18"} (current),
                 +52.312d {+52d 18' 41"} (1950)
GRB_ERROR:       1.89 [deg radius, statistical only]
DATA_SIGNIF:     16.80 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        17945 TJD;   192 DOY;   17/07/11
GRB_TIME:        80425.30 SOD {22:20:25.30} UT
GRB_PHI:         322.00 [deg]
GRB_THETA:        30.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       111.42d {+07h 25m 40s}  +21.98d {+21d 58' 38"}
SUN_DIST:         53.34 [deg]   Sun_angle= 3.9 [hr] (West of Sun)
MOON_POSTN:      323.22d {+21h 32m 54s}  -14.18d {-14d 10' 31"}
MOON_DIST:       101.40 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      146.19, -2.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       64.46, 32.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170711931/quicklook/glg_lc_medres34_bn170711931.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_521504430.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=761622).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:20:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     521504430
GRB_RA:           44.850d {+02h 59m 24s} (J2000),
                  45.156d {+03h 00m 37s} (current),
                  43.981d {+02h 55m 56s} (1950)
GRB_DEC:         +49.600d {+49d 36' 00"} (J2000),
                 +49.669d {+49d 40' 08"} (current),
                 +49.401d {+49d 24' 04"} (1950)
GRB_ERROR:       9.20 [deg radius, statistical plus systematic]
GRB_INTEN:       262 [cnts/sec]
DATA_SIGNIF:     13.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        17945 TJD;   192 DOY;   17/07/11
GRB_TIME:        80425.30 SOD {22:20:25.30} UT
GRB_PHI:         310.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.65
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      80%  GRB
2nd_MOST_LIKELY:  13%  Generic SGR
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       111.42d {+07h 25m 40s}  +21.98d {+21d 58' 38"}
SUN_DIST:         58.20 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.22d {+21h 32m 53s}  -14.18d {-14d 10' 33"}
MOON_DIST:        95.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      143.23, -8.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.54, 31.12 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170711931/quicklook/glg_lc_medres34_bn170711931.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 54.15,21.52 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=761622).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:21:44 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.783d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.854d {+47d 51' 15"} (J2000)
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80488.76 SOD {22:21:28.76} UT,   63.4 [sec] since BAT Trigger Time
COUNTS:          3    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:24:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     761622,   Seg_Num: 0
GRB_RA:           45.786d {+03h 03m 09s} (J2000),
                  46.088d {+03h 04m 21s} (current),
                  44.928d {+02h 59m 43s} (1950)
GRB_DEC:         +47.850d {+47d 51' 01"} (J2000),
                 +47.918d {+47d 55' 05"} (current),
                 +47.655d {+47d 39' 17"} (1950)
GRB_DATE:        17945 TJD;   192 DOY;   17/07/11
GRB_TIME:        80425.38 SOD {22:20:25.38} UT
TRIGGER_INDEX:   137
GRB_PHI:         -11.36 [deg]
GRB_THETA:        11.77 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     72.53 [sigma]
IMAGE_SIGNIF:    21.47 [sigma]
LC_URL:          sw00761622000msb.lc
SUN_POSTN:       111.42d {+07h 25m 40s}  +21.98d {+21d 58' 36"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.25d {+21h 33m 01s}  -14.17d {-14d 10' 06"}
MOON_DIST:        95.77 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.56, 29.27 [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 = 125.87,19.26 [deg].  
COMMENTS:        The 2nd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:25:18 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     761622,   Seg_Num: 0
GRB_RA:           45.7983d {+03h 03m 11.59s} (J2000),
                  46.1004d {+03h 04m 24.10s} (current),
                  44.9397d {+02h 59m 45.51s} (1950)
GRB_DEC:         +47.8490d {+47d 50' 56.3"} (J2000),
                 +47.9168d {+47d 55' 00.6"} (current),
                 +47.6534d {+47d 39' 12.2"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80496.00 SOD {22:21:36.00} UT,   70.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       111.42d {+07h 25m 40s}  +21.98d {+21d 58' 36"}
SUN_DIST:         57.50 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.26d {+21h 33m 03s}  -14.17d {-14d 10' 01"}
MOON_DIST:        95.78 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.64, -9.39 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.57, 29.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:27:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
POINT_ROLL:      92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80549.10 SOD {22:22:29.10} UT,   123.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.134
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        348 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1787 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00761622000msufc0123.fits
SUN_POSTN:       111.42d {+07h 25m 41s}  +21.98d {+21d 58' 35"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.28d {+21h 33m 06s}  -14.16d {-14d 09' 48"}
MOON_DIST:        95.76 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:27:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
POINT_ROLL:      92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80549.10 SOD {22:22:29.10} UT,   123.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.134
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        348 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1787 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00761622000msufc0123.fits
SUN_POSTN:       111.42d {+07h 25m 41s}  +21.98d {+21d 58' 35"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.28d {+21h 33m 07s}  -14.16d {-14d 09' 46"}
MOON_DIST:        95.75 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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 11 Jul 17 22:28:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
ROLL:            92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80549.10 SOD {22:22:29.10} UT,   123.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     521504568
X_OFFSET:        837 [pixels]
Y_OFFSET:        907 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1067
BINNING_INDEX:   1
IM_URL:          sw00761622000msuni0143.fits
SUN_POSTN:       111.42d {+07h 25m 41s}  +21.98d {+21d 58' 35"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.29d {+21h 33m 09s}  -14.16d {-14d 09' 38"}
MOON_DIST:        95.75 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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:     Tue 11 Jul 17 22:28:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
ROLL:            92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80549.10 SOD {22:22:29.10} UT,   123.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     521504568
X_OFFSET:        837 [pixels]
Y_OFFSET:        907 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1067
BINNING_INDEX:   1
IM_URL:          sw00761622000msuni0143.fits
SUN_POSTN:       111.42d {+07h 25m 41s}  +21.98d {+21d 58' 35"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.29d {+21h 33m 10s}  -14.16d {-14d 09' 36"}
MOON_DIST:        95.74 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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 #21321
V. D'Elia (ASDC), D. N. Burrows (PSU), A. Cholden-Brown (PSU), A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF/USRA), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 22:20:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170711A (trigger=761622). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 45.786, +47.850 which is
```
   RA(J2000) = 03h 03m 09s
   Dec(J2000) = +47d 51' 01"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Due to a data gap, the BAT light curve is currently available only until 8 seconds after the trigger. The available BAT lightcurve showed a single-peaked structure with a duration of about 10 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 22:21:28.7 UT, 63.4 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 45.79854, 47.84896 which is equivalent to:
```
   RA(J2000)  = 03h 03m 11.65s
   Dec(J2000) = +47d 50' 56.3"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 30 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 3.23 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 123 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.31.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). 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 11 Jul 17 22:40:17 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
POINT_ROLL:      92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  81305.37 SOD {22:35:05.37} UT,   880.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.123
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        348 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1787 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00761622000msufc0879.fits
SUN_POSTN:       111.43d {+07h 25m 43s}  +21.98d {+21d 58' 31"}
SUN_DIST:         57.52 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.39d {+21h 33m 34s}  -14.14d {-14d 08' 13"}
MOON_DIST:        95.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 11 Jul 17 22:40:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
POINT_ROLL:      92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  81305.37 SOD {22:35:05.37} UT,   880.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.123
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        348 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1787 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00761622000msufc0879.fits
SUN_POSTN:       111.43d {+07h 25m 43s}  +21.98d {+21d 58' 31"}
SUN_DIST:         57.52 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.39d {+21h 33m 35s}  -14.14d {-14d 08' 12"}
MOON_DIST:        95.66 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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 11 Jul 17 22:41:06 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     761622,   Seg_Num: 0
GRB_RA:           45.8016d {+03h 03m 12.38s} (J2000),
                  46.1037d {+03h 04m 24.89s} (current),
                  44.9429d {+02h 59m 46.30s} (1950)
GRB_DEC:         +47.8487d {+47d 50' 55.3"} (J2000),
                 +47.9165d {+47d 54' 59.5"} (current),
                 +47.6531d {+47d 39' 11.2"} (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:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  80496.00 SOD {22:21:36.00} UT,   70.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       111.43d {+07h 25m 43s}  +21.98d {+21d 58' 31"}
SUN_DIST:         57.51 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.40d {+21h 33m 36s}  -14.14d {-14d 08' 07"}
MOON_DIST:        95.67 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.64, -9.39 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.57, 29.26 [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:     Tue 11 Jul 17 22:41:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
ROLL:            92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  81305.37 SOD {22:35:05.37} UT,   880.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     521505324
X_OFFSET:        837 [pixels]
Y_OFFSET:        907 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1067
BINNING_INDEX:   1
IM_URL:          sw00761622000msuni0899.fits
SUN_POSTN:       111.43d {+07h 25m 43s}  +21.98d {+21d 58' 30"}
SUN_DIST:         57.52 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.40d {+21h 33m 37s}  -14.13d {-14d 08' 05"}
MOON_DIST:        95.65 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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:     Tue 11 Jul 17 22:41:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     761622,   Seg_Num: 0
POINT_RA:         45.782d {+03h 03m 08s} (J2000)
POINT_DEC:       +47.857d {+47d 51' 26"} (J2000)
ROLL:            92.205d
IMG_START_DATE:  17945 TJD;   192 DOY;   17/07/11
IMG_START_TIME:  81305.37 SOD {22:35:05.37} UT,   880.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     521505324
X_OFFSET:        837 [pixels]
Y_OFFSET:        907 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1067
BINNING_INDEX:   1
IM_URL:          sw00761622000msuni0899.fits
SUN_POSTN:       111.43d {+07h 25m 43s}  +21.98d {+21d 58' 30"}
SUN_DIST:         57.52 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      323.40d {+21h 33m 37s}  -14.13d {-14d 08' 04"}
MOON_DIST:        95.65 [deg]
MOON_ILLUM:      93 [%]
GAL_COORDS:      144.63, -9.39 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.56, 29.28 [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 #21322
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 170711A, we find an enhanced XRT position of the afterglow: RA, Dec: 45.8014, 47.8489 which is equivalent to:
```
   RA (J2000)  = 03 03 12.33
   Dec (J2000) = +47 50 55.9
```
with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/761622.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #21323
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1474 s of XRT Photon Counting mode data and 2 UVOT images for GRB 170711A, 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 = 45.80093, +47.84897 which is equivalent to:
```
RA (J2000): 03h 03m 12.22s
Dec (J2000): +47d 50' 56.3"
```
with an uncertainty of 2.3 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 #21324
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:20:25.30 UT on 11 July 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170711A (trigger 521504430 / 170711931) which was also detected by the Swift/BAT (V. D'Elia et al. 2017, GCN 21321) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 32 degrees.
The GBM light curve shows one spike with a duration (T90) of about 12 s (50-300 keV). The time-averaged spectrum from T0-2.6 s to T0+10.8 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.5 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 155 +/- 34 keV.
The event fluence (10-1000 keV) in this time interval is (2.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.3 s in the 10-1000 keV band is 7.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #21325
A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), B. Mingo (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and V. D'Elia report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 170711A (D'Elia et al. GCN Circ. 21321), from 51 s to 13.0 ks after the BAT trigger. The data comprise 6 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 21322).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.2 (+0.8, -0.7). At T+160 s the decay flattens to an alpha of -0.14 (+0.25, -0.65) before breaking again at T+1004 s to a final decay with index alpha=0.59 (+0.36, -0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.08 (+0.22, -0.21). The best-fitting absorption column is 6.7 (+1.5, -1.3) x 10^21 cm^-2, in excess of the Galactic value of 3.2 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 4.2 x 10^-11 (7.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.7 (+1.5, -1.3) x 10^21 cm^-2
Galactic foreground: 3.2 x 10^21 cm^-2
Excess significance: 4.2 sigma
Photon index:	     2.08 (+0.22, -0.21)
```
If the light curve continues to decay with a power-law decay index of 0.59, 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 7.7 x 10^-13 (1.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00761622.
This circular is an official product of the Swift-XRT team.
GCN Circular #21328
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 170711A (D'Elia, et al., GCN 21321) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2017/07 12.46 to 2017/07 12.48 UTC (12.68 to 13.13 hours after the BAT trigger), obtaining a total of 0.33 hours exposure in the r and i bands and 0.14 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Beardmore, et al., GCN 21323), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
 r > 22.94
 i > 22.86
 Z > 21.61
 Y > 21.45
 J > 21.08
 H > 20.83
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #21329
F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170711A 124 s after the BAT trigger (D'Elia et al., GCN Circ. 21321). No optical afterglow consistent with the enhanced XRT position (Beardmore et al. GCN Circ. 21323) 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 initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

u_FC               124          374          246         >19.8
v                  430         1553          136         >18.9
b                  379         1503          156         >19.4
w1                 480         1454           97         >19.6
m2                 604         1429           58         >18.6
w2                 704         1380           78         >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.31 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #21331
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), V. D'Elia (ASDC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170711A (trigger #761622) (D'Elia, et al., GCN Circ. 21321). The BAT ground-calculated position is RA, Dec = 45.782, 47.845 deg which is
```
  RA(J2000)  =  03h 03m 07.7s
  Dec(J2000) = +47d 50' 41.2"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single FRED-shaped peak, starting at T-2 sec, peaking at T+0 sec and decaying to background by T+6 sec. This is preceded by some weak, soft emission beginning at about T-25 sec. T90 (15-350 keV) is 31.3 +- 7.6 sec (estimated error including systematics).
The time-averaged spectrum from T-31.66 to T+15.37 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.75 +- 0.10. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.02 sec in the 15-150 keV band is 4.8 +- 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/761622/BA/
GCN Circular #21333
A. Volnova (IKI), A. Pozanenko (IKI), A. Mokhnatkin (KIAM), R. Inasaridze (AbAO), E. Mazaeva (IKI), V. Agletdinov (KIAM), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170711A (D'Elia et al. GCN 21321) with K-800 (0.8m) telescope of ISON/Terskol observatory starting on July, 12 (UT) 00:00:39 and AS-32 telescope of AbAO starting on July, 11 (UT) 23:58:46, i.e. about 1.6 hours after GRB trigger. We obtained several unfiltered images. We do not detect any source in stacked images within the enhanced XRT position (Beardmore et al. GCN 21323). Preliminary photometry of the field is following
```
Date       UT start  t-T0                 Filter   Exp.      OT     Err.  UL 
Telescope
                      (mid, days)                         (s)

2017-07-11   23:58:46 0.07894 CR      11*60 n/d n/d  17.0     AS-32
2017-07-12   00:00:39 0.07658 CR      45*25 n/d n/d  19.1     K-800
```
Photometry is based on nearby stars of USNO-B1.0
```
USNO-B1.0_id   R2
1378-0084355   14.59

1378-0084262   15.13

1378-0084218   14.70
```
We detect the object in coordinates (J2000) 03 03 11.46 +47 50 56.1 (+/- 0.5 arcsec) which is 7.7 arcsec apart from a center of the enhanced XRT position. The object is clearly detected in the stacked image of K-800 and marginally seen at the same position with AS-32 stacked image. The brightness of the object is 18.56 +/- 0.25 based on the reference stars listed above. The object is absent in the USNO-B1.0. At present, it is not clear whether this object has any relation to the GRB 170711A.
GCN Circular #21463
K. P. Mooley (Hintze Fellow, Oxford), 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, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 170711A (D'Elia et al., GCN 21321) 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 2017 Jul 12.14, Jul 13.38, Jul 16.29 and Jul 20.36 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 21323), with 3sigma upper limits of 186 uJy, 96 uJy, 102 uJy and 183 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: 11-Aug-2017 [Disclaimer]