Gamma-ray Burst 170519A

(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:     Fri 19 May 17 05:10:41 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.450d {+10h 53m 48s} (J2000),
                 163.686d {+10h 54m 45s} (current),
                 162.771d {+10h 51m 05s} (1950)
GRB_DEC:         +25.378d {+25d 22' 41"} (J2000),
                 +25.285d {+25d 17' 07"} (current),
                 +25.644d {+25d 38' 40"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14187 [cnts]    Image_Peak=463 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   289     E_range: 15-50 keV
BKG_INTEN:       121291 [cnts]
BKG_TIME:        18548.91 SOD {05:09:08.91} UT
BKG_DUR:         40 [sec]
GRB_DATE:        17892 TJD;   139 DOY;   17/05/19
GRB_TIME:        18602.80 SOD {05:10:02.80} UT
GRB_PHI:         160.55 [deg]
GRB_THETA:        13.02 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    10.30 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  +0  +0  +0 +10  +0 
SUN_POSTN:        56.19d {+03h 44m 45s}  +19.81d {+19d 48' 29"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.65d {+22h 10m 36s}  -11.54d {-11d 32' 07"}
MOON_DIST:       162.74 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      154.85, 16.91 [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 = 227.65,-8.98 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:11:49 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.4272d {+10h 53m 42.52s} (J2000),
                 163.6629d {+10h 54m 39.08s} (current),
                 162.7480d {+10h 51m 00.47s} (1950)
GRB_DEC:         +25.3746d {+25d 22' 28.5"} (J2000),
                 +25.2818d {+25d 16' 54.5"} (current),
                 +25.6410d {+25d 38' 27.4"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.58e-09 [erg/cm2/sec]
GRB_SIGNIF:      11.70 [sigma]
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18683.20 SOD {05:11:23.20} UT,   80.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.23 261.69 243.65
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        56.19d {+03h 44m 45s}  +19.81d {+19d 48' 30"}
SUN_DIST:         96.36 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.66d {+22h 10m 38s}  -11.53d {-11d 31' 57"}
MOON_DIST:       162.76 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      154.83, 16.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.25 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:12:00 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.4272d {+10h 53m 42.5s} (J2000),
                 163.6629d {+10h 54m 39.0s} (current),
                 162.7480d {+10h 51m 00.4s} (1950)
GRB_DEC:         +25.3746d {+25d 22' 28.5"} (J2000),
                 +25.2818d {+25d 16' 54.5"} (current),
                 +25.6410d {+25d 38' 27.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       137 [cnts]
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18683.20 SOD {05:11:23.20} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      288.99,  raw= 289  [pixels]
CENTROID_Y:      315.76,  raw= 316  [pixels]
ROLL:            295.37 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   40.93
GRB_POS_XRT_Z:   -41.02
IMAGE_URL:       sw00753445000msxps_rw.img
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 30"}
SUN_DIST:         96.36 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.66d {+22h 10m 39s}  -11.53d {-11d 31' 56"}
MOON_DIST:       162.76 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      154.83, 16.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:12:03 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.4272d {+10h 53m 42.5s} (J2000),
                 163.6629d {+10h 54m 39.0s} (current),
                 162.7480d {+10h 51m 00.4s} (1950)
GRB_DEC:         +25.3746d {+25d 22' 28.5"} (J2000),
                 +25.2818d {+25d 16' 54.5"} (current),
                 +25.6410d {+25d 38' 27.4"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       137 [cnts]
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18683.20 SOD {05:11:23.20} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      288.99,  raw= 289  [pixels]
CENTROID_Y:      315.76,  raw= 316  [pixels]
ROLL:            295.37 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   40.93
GRB_POS_XRT_Z:   -41.02
IMAGE_URL:       sw00753445000msxps_rw.img
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 30"}
SUN_DIST:         96.36 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.66d {+22h 10m 39s}  -11.53d {-11d 31' 55"}
MOON_DIST:       162.76 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      154.83, 16.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:13:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.450d {+10h 53m 48s} (J2000),
                 163.686d {+10h 54m 45s} (current),
                 162.771d {+10h 51m 05s} (1950)
GRB_DEC:         +25.378d {+25d 22' 41"} (J2000),
                 +25.285d {+25d 17' 07"} (current),
                 +25.644d {+25d 38' 40"} (1950)
GRB_DATE:        17892 TJD;   139 DOY;   17/05/19
GRB_TIME:        18602.80 SOD {05:10:02.80} UT
TRIGGER_INDEX:   289
GRB_PHI:         160.55 [deg]
GRB_THETA:        13.02 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    10.30 [sigma]
LC_URL:          sw00753445000msb.lc
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 31"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.68d {+22h 10m 43s}  -11.53d {-11d 31' 39"}
MOON_DIST:       162.75 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      154.85, 16.91 [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 = 227.65,-8.98 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:14:17 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.444d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.379d {+25d 22' 45"} (J2000)
POINT_ROLL:      295.366d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18694.54 SOD {05:11:34.54} UT,   91.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.491
N_STARS:         14
X_OFFSET:        496 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00753445000msufc0091.fits
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 31"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.68d {+22h 10m 43s}  -11.53d {-11d 31' 36"}
MOON_DIST:       162.75 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:14:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.444d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.379d {+25d 22' 45"} (J2000)
POINT_ROLL:      295.366d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18694.54 SOD {05:11:34.54} UT,   91.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.491
N_STARS:         14
X_OFFSET:        496 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00753445000msufc0091.fits
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 31"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.68d {+22h 10m 44s}  -11.53d {-11d 31' 34"}
MOON_DIST:       162.75 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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:     Fri 19 May 17 05:15:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.444d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.379d {+25d 22' 45"} (J2000)
ROLL:            295.366d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18694.54 SOD {05:11:34.54} UT,   91.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     516863513
X_OFFSET:        816 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       976
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00753445000msuni0111.fits
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 32"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.69d {+22h 10m 46s}  -11.52d {-11d 31' 24"}
MOON_DIST:       162.76 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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:     Fri 19 May 17 05:15:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.444d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.379d {+25d 22' 45"} (J2000)
ROLL:            295.366d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18694.54 SOD {05:11:34.54} UT,   91.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     516863513
X_OFFSET:        816 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       976
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00753445000msuni0111.fits
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 32"}
SUN_DIST:         96.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.69d {+22h 10m 47s}  -11.52d {-11d 31' 23"}
MOON_DIST:       162.76 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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:     Fri 19 May 17 05:17:25 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.4269d {+10h 53m 42.45s} (J2000),
                 163.6626d {+10h 54m 39.01s} (current),
                 162.7477d {+10h 50m 59.45s} (1950)
GRB_DEC:         +25.3742d {+25d 22' 27.1"} (J2000),
                 +25.2814d {+25d 16' 53.0"} (current),
                 +25.6406d {+25d 38' 26.0"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         17.06 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18691.00 SOD {05:11:31.00} UT,   88.2 [sec] since BAT Trigger Time
SUN_POSTN:        56.19d {+03h 44m 46s}  +19.81d {+19d 48' 33"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.71d {+22h 10m 50s}  -11.52d {-11d 31' 09"}
MOON_DIST:       162.78 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      154.83, 16.90 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 1.4 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #21106
T. N. Ukwatta (LANL), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC) and K. L. Page (U Leicester) report on behalf of the Swift Team:
At 05:10:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170519A (trigger=753445). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 163.450, +25.378 which is
```
   RA(J2000) = 10h 53m 48s
   Dec(J2000) = +25d 22' 41"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 05:11:23.2 UT, 80.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 163.42823, 25.37377 which is equivalent to:
```
   RA(J2000)  = 10h 53m 42.78s
   Dec(J2000) = +25d 22' 25.6"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 72 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. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 3.58e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 91 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	10:53:42.46 = 163.42693
  DEC(J2000) = +25:22:27.4  =  25.37429
```
with a 90%-confidence error radius of about 0.75 arc sec. This position is 1.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.07 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
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:     Fri 19 May 17 05:29:34 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     753445,   Seg_Num: 0
GRB_RA:          163.4282d {+10h 53m 42.76s} (J2000),
                 163.6638d {+10h 54m 39.32s} (current),
                 162.7490d {+10h 51m 00.23s} (1950)
GRB_DEC:         +25.3737d {+25d 22' 25.3"} (J2000),
                 +25.2809d {+25d 16' 51.2"} (current),
                 +25.6401d {+25d 38' 24.2"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18996.00 SOD {05:16:36.00} UT,   393.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        56.20d {+03h 44m 48s}  +19.81d {+19d 48' 39"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.82d {+22h 11m 16s}  -11.49d {-11d 29' 24"}
MOON_DIST:       162.81 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.02, 63.61 [deg] galactic lon,lat of the burst
ECL_COORDS:      154.83, 16.90 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:37:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.445d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.383d {+25d 22' 57"} (J2000)
POINT_ROLL:      295.367d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18907.42 SOD {05:15:07.42} UT,   304.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.717
N_STARS:         11
X_OFFSET:        496 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00753445000msufc0304.fits
SUN_POSTN:        56.21d {+03h 44m 50s}  +19.81d {+19d 48' 43"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.88d {+22h 11m 32s}  -11.47d {-11d 28' 19"}
MOON_DIST:       162.82 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.01, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 May 17 05:37:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.445d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.383d {+25d 22' 57"} (J2000)
POINT_ROLL:      295.367d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18907.42 SOD {05:15:07.42} UT,   304.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.717
N_STARS:         11
X_OFFSET:        496 [pixels]
Y_OFFSET:        431 [pixels]
X_MAX:           1455 [pixels]
Y_MAX:           1390 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00753445000msufc0304.fits
SUN_POSTN:        56.21d {+03h 44m 50s}  +19.81d {+19d 48' 43"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.88d {+22h 11m 32s}  -11.47d {-11d 28' 17"}
MOON_DIST:       162.82 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.01, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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:     Fri 19 May 17 05:38:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.445d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.383d {+25d 22' 57"} (J2000)
ROLL:            295.367d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18907.42 SOD {05:15:07.42} UT,   304.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     516863726
X_OFFSET:        816 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       976
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00753445000msuni0324.fits
SUN_POSTN:        56.21d {+03h 44m 50s}  +19.81d {+19d 48' 44"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.89d {+22h 11m 35s}  -11.47d {-11d 28' 06"}
MOON_DIST:       162.82 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.01, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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:     Fri 19 May 17 05:38:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     753445,   Seg_Num: 0
POINT_RA:        163.445d {+10h 53m 47s} (J2000)
POINT_DEC:       +25.383d {+25d 22' 57"} (J2000)
ROLL:            295.367d
IMG_START_DATE:  17892 TJD;   139 DOY;   17/05/19
IMG_START_TIME:  18907.42 SOD {05:15:07.42} UT,   304.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     516863726
X_OFFSET:        816 [pixels]
Y_OFFSET:        751 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       976
Y_GRB_POS:       911
BINNING_INDEX:   1
IM_URL:          sw00753445000msuni0324.fits
SUN_POSTN:        56.21d {+03h 44m 50s}  +19.81d {+19d 48' 44"}
SUN_DIST:         96.35 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      332.90d {+22h 11m 35s}  -11.47d {-11d 28' 04"}
MOON_DIST:       162.82 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      210.01, 63.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      154.84, 16.91 [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 #21107
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 2439 s of XRT Photon Counting mode data and 5 UVOT images for GRB 170519A, 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 = 163.42699, +25.37417 which is equivalent to:
```
RA (J2000): 10h 53m 42.48s
Dec (J2000): +25d 22' 27.0"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #21108
L. Izzo, A. de Ugarte Postigo, Z. Cano, D.A. Kann (IAA-CSIC) report on behalf of a larger collaboration,
We observed the field of GRB 170519A (Ukwatta et al., GCN 21106) with the T24 (Plane Wave CDK 0.61m) of the iTelescope.Net (http://www.itelescope.net) located at Auberry, CA. A single image of 300 s was taken in the V filter, starting at 07:18:04 UT, 2.13 hr after the GRB trigger. The GRB optical afterglow is clearly detected with a preliminary photometry estimate of V ~ 18, as compared to field stars of the GSC2.3 catalog.
An image of the field can be seen at http://goo.gl/GScY4H
GCN Circular #21109
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 170519A (Ukwatta, et al., GCN 21106) 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 2017/05 19.22 to 2017/05 19.32 UTC (1.8 minutes to 2.44 hours after the BAT trigger), obtaining a total of 1.41 hours exposure in the r and i bands and 0.60 hours exposure in the Z, Y, J, and H bands.
The optical transient (GCN 21106; Izzo, et al., GCN 21108) is clearly detected. In comparison with the SDSS DR9 and 2MASS catalogs, we obtain:
```
  r 16.72 +/- 0.01
  i 16.50 +/- 0.01
  Z 16.34 +/- 0.01
  Y 16.25 +/- 0.01
  J 16.15 +/- 0.01
  H 15.87 +/- 0.01
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The lightcurve rises in all bands initially, peaking at i~16 at about 15 minutes after the GRB trigger, then fading as t^(-0.8).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #21111
D. Xu, Z.P. Zhu, H.X. Feng (NAOC), C.M. Zhang, S.M. Hu (SDU), Y.D. Hu (IAA-CSIC), Y. Qin (Geneva Observatory) report:
We observed the field of GRB 170519A (Ukwatta et al., GCN 21106) using the 1-m telescope located at Weihai, Shandong, China. We obtained 4x360s frames in the Sloan r-filter, starting at 11:52:54 UT on 2017-05-19, i.e., 6.71 hr after the burst.
The optical afterglow (Ukwatta et al., GCN 21106; Izzo et al., GCN 21108) is clearly detected in our stacked image, and it has decayed to m(r) = 18.92 +/- 0.06 at 6.94 hr post-burst, calibrated with nearby SDSS stars.
GCN Circular #21112
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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+630 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170519A (trigger #753445) (Ukwatta, et al., GCN Circ. 21106). The BAT ground-calculated position is RA, Dec = 163.429, 25.374 deg which is
```
  RA(J2000)  =  10h 53m 42.9s 
  Dec(J2000) = +25d 22' 26.6" 
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows an initial peak starting around T-30 s, peaking at T+0 s, and decaying by T+15 s. Then there is a second, weaker peak from about T+180 s to T+220 s. T90 (15-350 keV) is 216.4 +- 49.4 sec (estimated error including systematics).
The time-averaged spectrum from T-28.5 to T+255.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.94 +- 0.26. The fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.84 sec in the 15-150 keV band is 0.7 +- 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/753445/BA/
GCN Circular #21113
Veli-Pekka Hentunen and Markku Nissinen (Taurus Hill Observatory (A95), Varkaus, Finland) report:
We have detected GRB 170519A optical afterglow at iTelescope observatory T11 (Mayhill, New Mexico) using 0.51-m/6.8 Planewave CDK telescope and FLI ProLine PL11002M CCD camera. The observations were started at 2017-05-19 05:25:24 (UT). Eleven unfiltered images and seven photometric R filter images with 120 sec exposure time were taken.
The optical afterglow was detected at the position RA 10:53:42.46 and DEC +25:22:27.4.
The following magnitudes were obtained from the observations using NOMAD1 1153-0183949 (R = 12.650) as a comparison star:
```
Tmid(s)+T0    Filter          Exp. time     Mag                 Mag err.
1119              unfiltered    3x120         15.52CR           0.03
1452              unfiltered    2x120         15.63CR           0.03
1906              R               3x120         15.98R              0.10
2324              R               2x120         16.08R              0.11
2806              unfiltered    4x120         16.07CR           0.05
3327              unfiltered    2x120         16.17CR           0.05
3795              R               2x120         16.50R              0.16
```
GCN Circular #21114
S. J. LaPorte (PSU), K.L. Page (U. Leicester), B. Mingo (U. Leicester), A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 9.5 ks of XRT data for GRB 170519A (Ukwatta et al. GCN Circ. 21106), from 73 s to 23.1 ks after the BAT trigger. The data comprise 291 s in Windowed Timing (WT) mode (the first 6 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 Beardmore et al. (GCN Circ. 21107).
The late-time light curve (from T0+4.1 ks) can be modelled with a power-law decay with a decay index of alpha=0.94 (+/-0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.62 (+/-0.05). The best-fitting absorption column is 1.78 (+0.12, -0.11) x 10^21 cm^-2, in excess of the Galactic value of 2.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.98 (+/-0.10) and a best-fitting absorption column of 1.20 (+0.29, -0.27) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.20 (+0.29, -0.27) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^20 cm^-2
Excess significance: 5.8 sigma
Photon index:	     1.98 (+/-0.10)
```
If the light curve continues to decay with a power-law decay index of 0.94, the count rate at T+24 hours will be 0.030 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.0 x 10^-12 (1.3 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00753445.
This circular is an official product of the Swift-XRT team.
GCN Circular #21115
WeiKang Zheng, Max Genecov, and Alex Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory responded to Swift GRB 170519A (Ukwatta et al., GCN 21106) starting at 05:14:24 UT, 262s after the burst. Observations were performed with an automatic sequence in the V, I, and clear (roughly R) filters, and the exposure time was 20 s per image, observations lasted about 2 hours. The optical afterglow (Ukwatta et al., GCN 21106; Izzo et al., GCN 21108; Butler et al., GCN 21109; Guidorzi et al., GCN 21110; Xu et al., GCN 21111; Hentunen & Nissinen, GCN 21113) was well detected in our V, I and clear filter images. A preliminary analysis shows that the afterglow rises at early time and peaked around 1 ks. After 3 ks after the burst, the light curve can be fitted by a power law with index of -0.83. A preliminary light curve is posted at: http://astro.berkeley.edu/~zwk/grb/GRB170519A/GRB170519A_kait.png
GCN Circular #21117
A. J. Castro-Tirado (IAA-CSIC & ISA-UMA), J. C. Tello, R. Cunniffe,=20 B.-B. Zhang, Y. Hu and A. Gonzalez-Rodriguez (IAA-CSIC), A. Castellon=20 (Univ. de Malaga), D. Hiriart and W. H. Lee (UNAM), on behalf of a=20 larger collaboration, report:
The 60 cm BOOTES-5/Javier Gorosabel Telescope at Observatorio=20 Astron=F3mico Nacional in San Pedro M=E1rtir (M=E9xico) automatically=20 responded to the Swift trigger of GRB 170519A (Ukwatta et al., GCN=20 21106). The first unfiltered images (60 s exposures) were obtained at=20 05:15:08.9 UT (5 min after the burst). At the position of the Swift=20 X-ray afterglow, we confirm the optical afterglow detected by UVOT, at a=20 magnitude of 16.6+/-0.1 when compared to the GSC2.3 catalog, and fading=20 during the late-time BOOTES-5/JGT observation.
We thank the staff at Observatorio Astron=F3mico Nacional in San Pedro=20 M=E1rtir for its excellent support.

GCN Circular #21118
GRB 170519A: Swift/UVOT Detection
S. J. LaPorte (PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170519A 93 s after the BAT trigger (Ukwatta et al., GCN Circ. 21106). A fading source consistent with the XRT position (Beardmore et al. GCN Circ. 21107) is detected in all initial UVOT exposures.
The preliminary UVOT position is:

    RA  (J2000) =  10:53:42.45 = 163.42688 (deg.)
    Dec (J2000) = +25:22:27.5  =  25.37431 (deg.)

with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)                  Mag

white              5315          5515         196          17.22+-0.03  
white               582           773          38          16.25+-0.04
white                89           239         147          16.91+-0.03
v                    68          5926         421          17.46+-0.08  
b                   557          6594         282          17.66+-0.05
u                   302           552         245          16.00+-0.04   
uvw1                680          6337         412          16.76+-0.05 
uvm2               5932          6131         196          17.13+-0.11   
uvw2                607           627          19          16.45+-0.20

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst

GCN Circular #21119
L. Izzo (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D.A. Kann (IAA-CSIC), C.C. Thoene (IAA-CSIC), P. Pessev (GTC, IAC) and A. Tejero (GTC) report on behalf of a larger collaboration:
We observed the afterglow of the GRB 170519A (Ukwatta et al., GCN 21106) using OSIRIS on the 10.4m GTC at the Roque de los Muchachos observatory (La Palma, Spain). The observation consisted of 3x1200s exposures using the R1000B grism, covering the range between 3700 and 7800 AA. The first spectrum started at 21:23 UT (16.22 hr after the burst).
We detect clear absorption features due to Mg II, Mg I, Fe II, Fe II* and Ca II H&K lines at the common redshift of z = 0.818, which we identify as the redshift of the GRB.
GCN Circular #21120
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. Xu (NAOC), D. Malesani (DARK/NBI), K.E. Heintz (DARK/NBI), D. Gandolfi (Univ. Turin), and J. Telting (NOT) report on behalf of a larger collaboration,
We have observed the field of GRB 170519A (Ukwatta et al., GCN 21106) with the 2.5m Nordic Optical Telescope at La Palma (Spain). The observations consisted of 3x120s in V-band and 5x120s in Sloan i-band. The GRB afterglow is well detected in all the individual frames. On an image starting at 21:51 UT (16.68 hr after the burst) we detect the optical afterglow at i(AB) = 19.7 mag, as compared to SDSS field stars. This confirms the t^(-0.8) decay reported by Butler et al. (GCN 21109) and by Zheng et al. (GCN 21115) that started 900 s after the GRB trigger.
GCN Circular #21121
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Subaru, NAOJ), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME and OISTER collaboration:
We observed the field of GRB 170519A (Ukwatta et al., GCNC 21106) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2017-05-19 11:03:26 UT (~5.9 h after the burst). We detected the previously reported afterglow (Ukwatta et al., GCNC 21106; Izzo et al., GCNC 21108) in all the three bands.
Photometric results of the OT are listed below. We used SDSS-DR8 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err  Rc  Rc_err  Ic  Ic_err
------------------------------------------------------------------
0.26646    11:33:44    3120.0    19.1  0.2   18.7 0.2   18.1  0.2
------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #21122
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 170519A (Ukwatta,, et al., GCN 21106) 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 2017/05 20.16 to 2017/05 20.32 UTC (22.66 to 26.62 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r and i bands and 0.97 hours exposure in the Z, Y, J, and H bands.
In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections of the optical transient:
```
  r =3D 20.57 +/- 0.01
  i =3D 20.39 +/- 0.01
  Z =3D 20.05 +/- 0.04
  Y =3D 20.15 +/- 0.05
  J =3D 20.02 +/- 0.06
  H =3D 19.72 +/- 0.07
```
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 Martir.
GCN Circular #21123
A. Martin-Carrillo (UCD), D. Murphy (UCD), L. Hanlon (UCD), H. J. van Hee= rden (UFS), B. van Soelen (UFS) and P. J. Meintjes (UFS)
We observed the field of GRB 170519A (Ukwatta, et al., GCN 21106 using th= e 40cm UCD Watcher telescope at Boyden Observatory in South Africa.
Observations started on May 19th at 16:30 UT (T0+11.5h) and consisted of = a series of 20s exposures in SDSS r=E2=80=99 filter for a total monitorin= g time of 3 hours. Based on combined images with mid-time at 17:00 UT, we= derive a preliminary magnitude of r=E2=80=99=3D19.3 +/- 0.3 (AB system).
Magnitudes were calibrated using 2 nearby APASS stars. No correction for = Galactic extinction in the direction of the GRB has been applied.
GCN Circular #21124
K. Morita, Y. Saito, R. Itoh, T. Yoshii, Y. Tachibana, S. Harita, Y. Muraki, T. Ozawa, K. Shiraishi, H. Mamiya, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 170519A (T. N. Ukwatta et al =2E, GCN Circular #21106) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2017-05-19 11:03:14 UT (21192 sec after the burst). We detected the optical counterpart (T. N. Ukwatta et al., GCN Circular #21106) in g', Rc and Ic band. The measured magnitudes were listed as follows.
```
T0+[hour]  MID-UT    T-EXP[sec]     g'         Rc              Ic  
----------------------------------------------------------------------------
~5.9       11:34:54  4278  =1B$B!!!!=1B(B19.14+/-0.15     18.48+/-0.11    18.13+/-0.13
----------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration.
GCN Circular #21162
E. Mazaeva (IKI), A. Krylov (KIAM), Yu. Krylova (KIAM), S. Schmalz (KIAM), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 170519A (Ukwatta et al., GCN 21106) with 22cm SSS-220 telescope of ISON/Multa observatory(* starting on May 19 (UT) 16:02:54. We took 120 unfiltered frames with 60 s exposure. The optical transient (Ukwatta et al., GCN 21106; Izzo, et al., GCN 21108) is clearly detected in a combined image.
Preliminary photometry of the combined image is following
```
Date        UT start  t-T0     Filter  Exp.   OT     err   UL
                       (mid, days)      (s)               (3sigma)
2017-05-19  16:02:54  0.53936  CR      120*60 18.92  0.28 19.0=09
```
The photometry is based on nearby SDSS stars:
```
SDSS-DR9_id         R(Lupton)
J105316.02+252545.1 16.75
J105332.97+252127.3 16.22
J105336.13+251707.2 15.46
J105322.03+251651.0 15.91
J105339.27+251620.6 16.66
J105338.87+252621.2 16.00
```
*) The ISON/Multa observatory is located in Altai, N 50d 10h 07m E 85d 57' 25". The SSS-220 telescope (22 cm, f/2.3) is equipped with CCD camera ML 11002.

GCN Circular #21169
E. Mazaeva (IKI), K. Antonyuk (CrAO), I. Nikolenko (CrAO), V. Rumyantsev (CrAO), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 170519A (Ukwatta et al., GCN 21106) with AZT-11 telescope of CrAO observatory starting on May 19 (UT) 19:07:44, and with Zeiss-1000/Koshka telescope of Simeiz branch of CrAO observatory starting on May 19 (UT) 19:28:57. We took several images in filter R with exposures of 180 s. We clearly detect the afterglow (Ukwatta et al., GCN 21106; Izzo et al., GCN 21108) in combined images.
Preliminary photometry of the combined images is following

UT start    t-T0   Filter       Exp.     OT      err    UL    Telescope
            (mid, days)       (s)                       (3sigma)

19:07:44   0.58810	R	6*180    19.17   0.11   20.9  AZT-11
19:26:08   0.59878	R	4*180    19.23   0.12   20.7  AZT-11
19:41:28   0.61473	R	9*180    19.58   0.12   21.1  AZT-11
19:28:57   0.59751	R	1*180    19.05   0.10   20.4  Zeiss-1000
19:31:58   0.60066	R	2*180    19.12   0.10   21.1  Zeiss-1000
19:38:02   0.60592	R	3*180    19.52   0.14   20.3  Zeiss-1000
19:47:08   0.61224	R	3*180    19.52   0.16   20.3  Zeiss-1000
19:56:13   0.62065	R	5*180    19.64   0.14   21.3  Zeiss-1000

The photometry is based on nearby SDSS stars:

SDSS-DR9_id	    R(Lupton)
J105339.53+252259.9 17.32
J105332.97+252127.3 16.22		
J105348.21+252041.2 17.03			
J105341.14+252534.0 16.18				
J105353.70+252400.0 15.30

GCN Circular #21206
E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 170519A (Ukwatta et al., GCN 21106) with AZT-33IK telescope of Sayan observatory (Mondy) starting on May 20 (UT) 16:27:01. We took several images in R-filter with exposures of 120 s. The optical afterglow (Ukwatta et al., GCN 21106; Izzo, et al., GCN 21108) is clearly visible in single images.
We continued our observations on May 27 (UT) 16:28:02, i.e., ~8.5 days after the BAT trigger. We took several R-filtered images. We do not detect the optical counterpart in the enhanced XRT error circle (Beardmore et al., GCN 21107).
Preliminary photometry of the afterglow is following:
```
Date       UT start   t-T0    Filter  Exp.     OT     Err.     UL
                                    (mid, days)      (s) 
        (3 sigma)

2017-05-20 16:27:01  1.47708  R   10*120  19.99 0.03 22.8
2017-05-20 17:07:02  1.50487  R   10*120  19.99 0.03 22.6
2017-05-27 16:28:02  8.49905  R   39*120  n/d   n/d  22.6
```
The photometry is based on nearby SDSS stars reported by Mazaeva et al. (GCN 21169).
GCN Circular #21208
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (Fesenkov Astrophysical Institute), R. Inasaridze (AbAO), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), 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 GRB 170519A (Ukwatta et al., GCN 21106) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on May 20 (UT) 18:42:38. We took several images in R-filter with exposures of 120 s during this night and 2 subsequent nights. The optical afterglow (Ukwatta et al., GCN 21106; Izzo, et al., GCN 21108) is visible in stacked images.
We also observed this field with AS-32 (0.7m) telescope of Abastumani Observatory on May 21 (UT) 17:22:33. We took several unfiltered frames with 60 s exposure. In the enhanced XRT error circle (Beardmore et al., GCN 21107) we do not detect the afterglow.
Preliminary photometry of the afterglow is following:
```
Date       UT start   t-T0    Filter Exp.   OT   Err. UL    Telescope
                      (mid, days)     (s)              (3 sigma)

2017-05-20 18:42:38  1.58414  R    24*120  20.06 0.06 21.4 Zeiss-1000
2017-05-21 15:58:25  2.48340  R    39*120  20.95 0.14 21.6 Zeiss-1000
2017-05-22 15:27:05  3.46168  R    39*120  22.20 0.40 21.9 Zeiss-1000
2017-05-21 17:22:33  2.52050  CR   20*60   n/d   n/d  20.8 AS-32
```
The photometry is based on nearby SDSS stars, reported by Mazaeva et al. (GCN 21169).
The light curve of the GRB 170519A afterglow based on our observations (GCNs 21162, 21169, 21206) can be found at http://grb.rssi.ru/GRB170519A/GRB170519A_lc.png
GCN Circular #21211
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 170519A (Ukwatta et al., GCN 21106) 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 May 19.61, May 20.84, May 23.74 and May 27.78 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 21107), with 3sigma upper limits of 228 uJy, 190 uJy, 150 uJy, and 100 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: 08-Jun-2017 [Disclaimer]