Gamma-ray Burst 150819A

(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 19 Aug 15 00:51:26 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     652643,   Seg_Num: 0
GRB_RA:           42.337d {+02h 49m 21s} (J2000),
                  42.547d {+02h 50m 11s} (current),
                  41.664d {+02h 46m 39s} (1950)
GRB_DEC:          +9.784d {+09d 47' 02"} (J2000),
                  +9.848d {+09d 50' 53"} (current),
                  +9.577d {+09d 34' 37"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1376 [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:        17253 TJD;   231 DOY;   15/08/19
GRB_TIME:        3008.98 SOD {00:50:08.98} UT
GRB_PHI:          -5.38 [deg]
GRB_THETA:        22.77 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.26 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -3  +0  +0 +22  +0 
SUN_POSTN:       148.01d {+09h 52m 03s}  +12.93d {+12d 55' 59"}
SUN_DIST:        102.58 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.37d {+12h 53m 30s}   -4.41d {-04d 24' 51"}
MOON_DIST:       150.56 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.73,-43.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.88, -6.21 [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 = 65.30,-20.02 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 00:52:34 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.332d {+02h 49m 20s} (J2000)
POINT_DEC:        +9.784d {+09d 47' 01"} (J2000)
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3147.11 SOD {00:52:27.11} UT,   138.1 [sec] since BAT Trigger Time
COUNTS:          43    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      2
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Algorithm did not converge; too many iterations.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 00:54:19 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     652643,   Seg_Num: 0
GRB_RA:           42.337d {+02h 49m 21s} (J2000),
                  42.547d {+02h 50m 11s} (current),
                  41.664d {+02h 46m 39s} (1950)
GRB_DEC:          +9.784d {+09d 47' 02"} (J2000),
                  +9.848d {+09d 50' 53"} (current),
                  +9.577d {+09d 34' 37"} (1950)
GRB_DATE:        17253 TJD;   231 DOY;   15/08/19
GRB_TIME:        3008.98 SOD {00:50:08.98} UT
TRIGGER_INDEX:   20000
GRB_PHI:          -5.38 [deg]
GRB_THETA:        22.77 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.26 [sigma]
LC_URL:          sw00652643000msb.lc
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 57"}
SUN_DIST:        102.58 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.40d {+12h 53m 35s}   -4.42d {-04d 25' 17"}
MOON_DIST:       150.59 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.73,-43.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.88, -6.21 [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 = 65.30,-20.02 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 00:55:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.332d {+02h 49m 20s} (J2000)
POINT_DEC:        +9.784d {+09d 47' 01"} (J2000)
POINT_ROLL:      74.221d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3151.66 SOD {00:52:31.66} UT,   142.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.079
N_STARS:         26
X_OFFSET:        521 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1480 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00652643000msufc0142.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 56"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.41d {+12h 53m 37s}   -4.42d {-04d 25' 28"}
MOON_DIST:       150.60 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 00:55:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.332d {+02h 49m 20s} (J2000)
POINT_DEC:        +9.784d {+09d 47' 01"} (J2000)
POINT_ROLL:      74.221d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3151.66 SOD {00:52:31.66} UT,   142.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.079
N_STARS:         26
X_OFFSET:        521 [pixels]
Y_OFFSET:        560 [pixels]
X_MAX:           1480 [pixels]
Y_MAX:           1519 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00652643000msufc0142.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 55"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.41d {+12h 53m 38s}   -4.43d {-04d 25' 32"}
MOON_DIST:       150.60 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 00:57:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.332d {+02h 49m 20s} (J2000)
POINT_DEC:        +9.784d {+09d 47' 01"} (J2000)
ROLL:            74.221d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3151.66 SOD {00:52:31.66} UT,   142.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     461638366
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0158.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 54"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.42d {+12h 53m 40s}   -4.43d {-04d 25' 41"}
MOON_DIST:       150.61 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 00:57:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.332d {+02h 49m 20s} (J2000)
POINT_DEC:        +9.784d {+09d 47' 01"} (J2000)
ROLL:            74.221d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3151.66 SOD {00:52:31.66} UT,   142.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     461638366
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0158.fits
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 54"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.42d {+12h 53m 41s}   -4.43d {-04d 25' 44"}
MOON_DIST:       150.62 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 00:57:06 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     652643,   Seg_Num: 0
GRB_RA:           42.3314d {+02h 49m 19.53s} (J2000),
                  42.5418d {+02h 50m 10.04s} (current),
                  41.6590d {+02h 46m 38.16s} (1950)
GRB_DEC:          +9.8066d {+09d 48' 23.7"} (J2000),
                  +9.8708d {+09d 52' 14.9"} (current),
                  +9.5997d {+09d 35' 58.8"} (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:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3196.00 SOD {00:53:16.00} UT,   187.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       148.02d {+09h 52m 04s}  +12.93d {+12d 55' 54"}
SUN_DIST:        102.58 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.42d {+12h 53m 40s}   -4.43d {-04d 25' 42"}
MOON_DIST:       150.61 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.70,-43.30 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.88, -6.18 [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 Circular #18163
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), S. B. Cenko (GSFC), V. D'Elia (ASDC), L. Izzo (URoma/ICRA), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 00:50:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150819A (trigger=652643). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 42.337, +9.784 which is
```
   RA(J2000)  =  02h 49m 21s
   Dec(J2000) = +09d 47' 02"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers, the real-time light curve does not show anything significant.
The XRT began observing the field at 00:52:27.1 UT, 138.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 42.33146, 9.80665 which is equivalent to:
```
   RA(J2000)  = 02h 49m 19.55s
   Dec(J2000) = +09d 48' 23.9"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 83 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 1.85 x 10^21 cm^-2 (Willingale et al. 2013).
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 expected extinction corresponding to E(B-V) of 0.22.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 01:03:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 10"} (J2000)
POINT_ROLL:      74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3309.86 SOD {00:55:09.86} UT,   300.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.967
N_STARS:         29
X_OFFSET:        281 [pixels]
Y_OFFSET:        320 [pixels]
X_MAX:           1720 [pixels]
Y_MAX:           1759 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00652643000msufc0300.fits
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 49"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.47d {+12h 53m 52s}   -4.44d {-04d 26' 39"}
MOON_DIST:       150.67 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 01:03:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 10"} (J2000)
POINT_ROLL:      74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3309.86 SOD {00:55:09.86} UT,   300.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.967
N_STARS:         29
X_OFFSET:        281 [pixels]
Y_OFFSET:        320 [pixels]
X_MAX:           1720 [pixels]
Y_MAX:           1759 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00652643000msufc0300.fits
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 49"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.47d {+12h 53m 53s}   -4.45d {-04d 26' 42"}
MOON_DIST:       150.67 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 01:04:03 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     652643,   Seg_Num: 0
GRB_RA:           42.3333d {+02h 49m 19.99s} (J2000),
                  42.5437d {+02h 50m 10.49s} (current),
                  41.6609d {+02h 46m 38.62s} (1950)
GRB_DEC:          +9.8073d {+09d 48' 26.2"} (J2000),
                  +9.8715d {+09d 52' 17.4"} (current),
                  +9.6004d {+09d 36' 01.4"} (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:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3196.00 SOD {00:53:16.00} UT,   187.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 49"}
SUN_DIST:        102.58 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.47d {+12h 53m 53s}   -4.45d {-04d 26' 44"}
MOON_DIST:       150.67 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.71,-43.30 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.89, -6.18 [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 19 Aug 15 01:05:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 10"} (J2000)
ROLL:            74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3309.86 SOD {00:55:09.86} UT,   300.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     461638524
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0316.fits
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 48"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.48d {+12h 53m 55s}   -4.45d {-04d 26' 54"}
MOON_DIST:       150.68 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 01:05:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 10"} (J2000)
ROLL:            74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3309.86 SOD {00:55:09.86} UT,   300.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     461638524
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0316.fits
SUN_POSTN:       148.02d {+09h 52m 05s}  +12.93d {+12d 55' 48"}
SUN_DIST:        102.59 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.48d {+12h 53m 56s}   -4.45d {-04d 26' 55"}
MOON_DIST:       150.68 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 01:11:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 09"} (J2000)
POINT_ROLL:      74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3887.32 SOD {01:04:47.32} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.301
N_STARS:         44
X_OFFSET:        281 [pixels]
Y_OFFSET:        320 [pixels]
X_MAX:           1720 [pixels]
Y_MAX:           1759 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00652643000msufc0878.fits
SUN_POSTN:       148.03d {+09h 52m 06s}  +12.93d {+12d 55' 43"}
SUN_DIST:        102.60 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.53d {+12h 54m 08s}   -4.46d {-04d 27' 53"}
MOON_DIST:       150.73 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Aug 15 01:11:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 09"} (J2000)
POINT_ROLL:      74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3887.32 SOD {01:04:47.32} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.301
N_STARS:         44
X_OFFSET:        281 [pixels]
Y_OFFSET:        320 [pixels]
X_MAX:           1720 [pixels]
Y_MAX:           1759 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00652643000msufc0878.fits
SUN_POSTN:       148.03d {+09h 52m 06s}  +12.93d {+12d 55' 42"}
SUN_DIST:        102.60 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.53d {+12h 54m 08s}   -4.47d {-04d 27' 54"}
MOON_DIST:       150.73 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 01:12:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 09"} (J2000)
ROLL:            74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3887.32 SOD {01:04:47.32} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     461639102
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0894.fits
SUN_POSTN:       148.03d {+09h 52m 07s}  +12.93d {+12d 55' 42"}
SUN_DIST:        102.60 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.54d {+12h 54m 10s}   -4.47d {-04d 28' 04"}
MOON_DIST:       150.74 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 19 Aug 15 01:12:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     652643,   Seg_Num: 0
POINT_RA:         42.331d {+02h 49m 19s} (J2000)
POINT_DEC:        +9.786d {+09d 47' 09"} (J2000)
ROLL:            74.220d
IMG_START_DATE:  17253 TJD;   231 DOY;   15/08/19
IMG_START_TIME:  3887.32 SOD {01:04:47.32} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     461639102
X_OFFSET:        840 [pixels]
Y_OFFSET:        879 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1000
Y_GRB_POS:       1039
BINNING_INDEX:   1
IM_URL:          sw00652643000msuni0894.fits
SUN_POSTN:       148.03d {+09h 52m 07s}  +12.93d {+12d 55' 42"}
SUN_DIST:        102.60 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      193.54d {+12h 54m 10s}   -4.47d {-04d 28' 04"}
MOON_DIST:       150.74 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      164.72,-43.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.88, -6.20 [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 #18165
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 150819A, we find an enhanced XRT position of the afterglow: RA, Dec: 42.3335, 9.8075 which is equivalent to:
```
   RA (J2000)  = 02 49 20.03
   Dec (J2000) = +09 48 26.9
```
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/652643.
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 #18167
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2467 s of XRT Photon Counting mode data and 4 UVOT images for GRB 150819A, 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 = 42.33310, +9.80748 which is equivalent to:
```
RA (J2000): 02h 49m 19.94s
Dec (J2000): +09d 48' 26.9"
```
with an uncertainty of 1.5 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 #18168
A. A. Breeveld (UCL-MSSL) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150819A 143 s after the BAT trigger (Ukwatta et al., GCN Circ. 18163). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 18167) 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           143          292          147         >21.0
u_FC               301          551          246         >20.2
white              143         7062          569         >21.4
v                  631         6037          274         >19.6
b                  557         6857          274         >20.3
u                  301         6652          501         >20.4
w1                 680         6447          274         >20.0
m2                 656         6242          274         >19.9
w2                 607         7135          346         >20.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.22 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #18169
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa,A.Kuznetsov,D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, O.Gres, N.M.Budnev, S.Yazev, Irkutsk State University
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in IAC was pointed to the GRB150819.03 25 sec after notice time and 100 sec after trigger time at 2015-08-19 00:51:51 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT error-box (Ukwatta, Barthelmy et al., GCN 18163; Evans, GCN 18165; Evans et al., GCN 18167). Zenit distance was aboute ~76 degrees. The 5-sigma upper limit has been about 17.5 mag Our results are:
```
T_start     T-Tmid  Expt.   Mlimit Coadd
00:51:51.6    112     20     17.5    1
00:51:51.6    163     90     18.0    3
00:54:05.5    337    180     18.9    3
00:51:51.6    536    760     19.8   10
01:06:31.0   1995   1800     20.4   10
```
The message may be cited.
GCN Circular #18170
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlinks, we report further analysis of BAT GRB 150819A (trigger #652643) (Ukwatta, et al., GCN Circ. `8`63). The BAT ground-calculated position is RA, Dec = 42.340, 9.787 deg, which is
```
   RA(J2000)  =  02h 49m 21.5s 
   Dec(J2000) = +09d 47' 11.6" 
```
with an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 93%.
the mask-weighted light curve shows a broad peaking starting at ~T+10 sec, peaking at ~T+40 sec, and ending at ~T+70 sec. T90 (15-350 keV) is 52.1 +- 12.9 sec (estimated error including systematics).
The time-averaged spectrum from T+14.18 to T+73.46 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.27. The fluence in the 15-150 keV band is 4.8 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+17.70 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/652643/BA/
GCN Circular #18172
B.P. Gompertz (U. Leicester), A. D'ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 7.1 ks of XRT data for GRB 150819A (Ukwatta et al. GCN Circ. 18163), from 122 s to 34.3 ks after the BAT trigger. The data comprise 43 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 18165).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.62 (+/-0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.42 (+0.24, -0.23). The best-fitting absorption column is 6.6 (+2.3, -1.9) x 10^21 cm^-2, in excess of the Galactic value of 1.8 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 6.1 x 10^-11 (7.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.6 (+2.3, -1.9) x 10^21 cm^-2
Galactic foreground: 1.8 x 10^21 cm^-2
Excess significance: 4.1 sigma
Photon index:	     1.42 (+0.24, -0.23)
```
If the light curve continues to decay with a power-law decay index of 1.62, the count rate at T+24 hours will be 2.0 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-14 (1.6 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00652643.
This circular is an official product of the Swift-XRT team.
GCN Circular #18173
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 150819A (Ukwatta et al., GCN 18163) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2015/08 19.33 to 2015/08 19.48 UTC (7.08 to 10.60 hours after the BAT trigger), obtaining a total of 2.80 hours exposure in the r and i bands.
For a source within the enhanced Swift-XRT error circle (Evans et al., GCN 18165), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
   r	> 23.60
   i	> 23.91
```
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 #18181
S. Schulze (PUC, MAS), D. Malesani, J. P. U. Fynbo (DARK, NBI), J. Duus, T. Hinz-Berg, O. Busborg Jensen (NBI) and P. Jakobsson (U Iceland) report on behalf a larger collaboration:
We observed the field of GRB 150819A (Ukwatta et al., GCN 18163) with the Nordic Optical Telescope (NOT) equipped with ALFOSC. We obtained 4 images in the I band and 3 images in the z band with an individual sub-exposure time of 300 s. Observations started at 02:01 UT on August 19 (i.e. 1.19 hr after the burst).
We detect no credible source in the co-added I and z band images at the refined XRT localisation (Evans et al., GCN 18167). The limiting magnitude of the I-band image is 23 mag (3 sigma, Vega). This value is not corrected for foreground extinction. The flux calibration of the z-band image is still pending.
GCN Circular #18193
E. Mazaeva (IKI), E. Klunko (ISTP), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150819A (Ukwatta et al., GCN 18163) with AZT-33IK telescope of Sayan observatory (Mondy) and Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R-filter in each telescope. We do not detect any source within enhanced XRT error circle (Evans et al., GCN 18167). Upper limits of the field are following
```
Date       UT start   t-T0     Filter   Exp.    UL(3 sigma)  Telescope
                       (mid, days)       (s)

2015-08-19 19:06:09   0.78197  R        30*120  22.7         AZT-33IK
2015-08-19 21:57:51   0.89889  R        10*300  19.4         Zeiss-1000
```
Photometry is based on USNO-B1.0 stars:
```
USNO-B.1_id    R2
0997-0042082 17.56
0997-0042080 18.70
```

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Jochen Greiner, last update: 22-Aug-2015 [Disclaimer]