Gamma-ray Burst 180613A

(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 13 Jun 18 15:37:51 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.562d {+14h 06m 15s} (J2000),
                 211.849d {+14h 07m 24s} (current),
                 210.787d {+14h 03m 09s} (1950)
GRB_DEC:         -43.076d {-43d 04' 31"} (J2000),
                 -43.163d {-43d 09' 46"} (current),
                 -42.837d {-42d 50' 14"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2788 [image_cnts]
TRIGGER_DUR:     80.000 [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:        18282 TJD;   164 DOY;   18/06/13
GRB_TIME:        56178.90 SOD {15:36:18.90} UT
GRB_PHI:         165.83 [deg]
GRB_THETA:        17.88 [deg]
SOLN_STATUS:     0x2013
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.59 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +0  +0  +0 +69  +0 
SUN_POSTN:        81.93d {+05h 27m 43s}  +23.23d {+23d 13' 43"}
SUN_DIST:        134.42 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.61d {+05h 18m 27s}  +19.36d {+19d 21' 37"}
MOON_DIST:       133.58 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.17, 17.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.00,-28.33 [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:        There is a bright star (mag=6.20) 1.22 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 43.09,16.69 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:39:26 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.5201d {+14h 06m 04.8s} (J2000),
                 211.8070d {+14h 07m 13.6s} (current),
                 210.7456d {+14h 02m 58.9s} (1950)
GRB_DEC:         -43.0702d {-43d 04' 12.7"} (J2000),
                 -43.1576d {-43d 09' 27.4"} (current),
                 -42.8319d {-42d 49' 54.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56327.79 SOD {15:38:47.79} UT,   148.9 [sec] since BAT Trigger Time
CENTROID_X:      272.13,  raw= 272  [pixels]
CENTROID_Y:      298.48,  raw= 298  [pixels]
ROLL:            260.99 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   0.20
GRB_POS_XRT_Z:   -80.77
IMAGE_URL:       sw00840853000msxps_rw.img
SUN_POSTN:        81.93d {+05h 27m 43s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.39 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.63d {+05h 18m 31s}  +19.36d {+19d 21' 44"}
MOON_DIST:       133.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.14, 17.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      224.97,-28.34 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:39:30 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.5201d {+14h 06m 04.8s} (J2000),
                 211.8070d {+14h 07m 13.6s} (current),
                 210.7456d {+14h 02m 58.9s} (1950)
GRB_DEC:         -43.0702d {-43d 04' 12.7"} (J2000),
                 -43.1576d {-43d 09' 27.4"} (current),
                 -42.8319d {-42d 49' 54.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56327.79 SOD {15:38:47.79} UT,   148.9 [sec] since BAT Trigger Time
CENTROID_X:      272.13,  raw= 272  [pixels]
CENTROID_Y:      298.48,  raw= 298  [pixels]
ROLL:            260.99 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   0.20
GRB_POS_XRT_Z:   -80.77
IMAGE_URL:       sw00840853000msxps_rw.img
SUN_POSTN:        81.93d {+05h 27m 43s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.39 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.63d {+05h 18m 32s}  +19.36d {+19d 21' 45"}
MOON_DIST:       133.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.14, 17.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      224.97,-28.34 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:39:15 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.5201d {+14h 06m 04.82s} (J2000),
                 211.8070d {+14h 07m 13.66s} (current),
                 210.7456d {+14h 02m 58.94s} (1950)
GRB_DEC:         -43.0702d {-43d 04' 12.7"} (J2000),
                 -43.1576d {-43d 09' 27.4"} (current),
                 -42.8319d {-42d 49' 54.8"} (1950)
GRB_ERROR:       6.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.63e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.47 [sigma]
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56327.79 SOD {15:38:47.79} UT,   148.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.17 261.58 243.53
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        81.93d {+05h 27m 43s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.39 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.63d {+05h 18m 31s}  +19.36d {+19d 21' 44"}
MOON_DIST:       133.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.14, 17.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      224.97,-28.34 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.87 arcmin from the BAT position.  
COMMENTS:        There is a bright star (mag=6.20) 1.71 arcmin from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:40:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.562d {+14h 06m 15s} (J2000),
                 211.849d {+14h 07m 24s} (current),
                 210.787d {+14h 03m 09s} (1950)
GRB_DEC:         -43.076d {-43d 04' 31"} (J2000),
                 -43.163d {-43d 09' 46"} (current),
                 -42.837d {-42d 50' 14"} (1950)
GRB_DATE:        18282 TJD;   164 DOY;   18/06/13
GRB_TIME:        56178.90 SOD {15:36:18.90} UT
TRIGGER_INDEX:   20000
GRB_PHI:         165.83 [deg]
GRB_THETA:        17.88 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     80.000 [sec] 
SOLN_STATUS:     0x2013
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.59 [sigma]
LC_URL:          sw00840853000msb.lc
SUN_POSTN:        81.93d {+05h 27m 43s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.42 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.64d {+05h 18m 34s}  +19.36d {+19d 21' 50"}
MOON_DIST:       133.56 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.17, 17.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.00,-28.33 [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:        There is a bright star (mag=6.20) 1.22 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 43.09,16.69 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:43:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.550d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.067d {-43d 04' 00"} (J2000)
POINT_ROLL:      260.987d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56333.56 SOD {15:38:53.56} UT,   154.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.811
N_STARS:         190
X_OFFSET:        160 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00840853000msufc0154.fits
SUN_POSTN:        81.93d {+05h 27m 44s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.67d {+05h 18m 42s}  +19.37d {+19d 22' 04"}
MOON_DIST:       133.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:43:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.550d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.067d {-43d 04' 00"} (J2000)
POINT_ROLL:      260.987d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56333.56 SOD {15:38:53.56} UT,   154.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.811
N_STARS:         190
X_OFFSET:        160 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00840853000msufc0154.fits
SUN_POSTN:        81.93d {+05h 27m 44s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.68d {+05h 18m 43s}  +19.37d {+19d 22' 06"}
MOON_DIST:       133.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:44:44 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.550d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.067d {-43d 04' 00"} (J2000)
ROLL:            260.987d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56333.56 SOD {15:38:53.56} UT,   154.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     550597154
X_OFFSET:        936 [pixels]
Y_OFFSET:        787 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1096
Y_GRB_POS:       947
BINNING_INDEX:   1
IM_URL:          sw00840853000msuni0176.fits
SUN_POSTN:        81.93d {+05h 27m 44s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.69d {+05h 18m 45s}  +19.37d {+19d 22' 10"}
MOON_DIST:       133.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [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).  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:44:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.550d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.067d {-43d 04' 00"} (J2000)
ROLL:            260.987d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56333.56 SOD {15:38:53.56} UT,   154.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     550597154
X_OFFSET:        936 [pixels]
Y_OFFSET:        787 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1096
Y_GRB_POS:       947
BINNING_INDEX:   1
IM_URL:          sw00840853000msuni0176.fits
SUN_POSTN:        81.93d {+05h 27m 44s}  +23.23d {+23d 13' 44"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.69d {+05h 18m 46s}  +19.37d {+19d 22' 11"}
MOON_DIST:       133.52 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [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.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:53:36 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.551d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.065d {-43d 03' 54"} (J2000)
POINT_ROLL:      260.990d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  57033.48 SOD {15:50:33.48} UT,   854.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.532
N_STARS:         190
X_OFFSET:        376 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1815 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00840853000msufc0854.fits
SUN_POSTN:        81.94d {+05h 27m 45s}  +23.23d {+23d 13' 46"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.79d {+05h 19m 08s}  +19.38d {+19d 22' 53"}
MOON_DIST:       133.47 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN Circular #22769
A. Tohuvavohu (PSU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and T. N. Ukwatta (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 15:36:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180613A (trigger=840853). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 211.562, -43.076 which is
```
   RA(J2000) = 14h 06m 15s
   Dec(J2000) = -43d 04' 31"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the available BAT light curve shows no significant structure.
The XRT began observing the field at 15:38:47.7 UT, 148.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 211.52004, -43.07158 which is equivalent to:
```
   RA(J2000)  = 14h 06m 04.81s
   Dec(J2000) = -43d 04' 17.7"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 111 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (6.50 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 4.5 (+3.67/-3.01) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 5.63e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 154 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 0.09.
Burst Advocate for this burst is A. Tohuvavohu (aaronb AT swift.psu.edu). 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 13 Jun 18 15:53:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.551d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.065d {-43d 03' 54"} (J2000)
POINT_ROLL:      260.990d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  57033.48 SOD {15:50:33.48} UT,   854.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.532
N_STARS:         190
X_OFFSET:        376 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1815 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00840853000msufc0854.fits
SUN_POSTN:        81.94d {+05h 27m 45s}  +23.23d {+23d 13' 46"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.79d {+05h 19m 09s}  +19.38d {+19d 22' 54"}
MOON_DIST:       133.47 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:55:02 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.551d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.065d {-43d 03' 54"} (J2000)
ROLL:            260.990d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  57033.48 SOD {15:50:33.48} UT,   854.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     550597854
X_OFFSET:        935 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00840853000msuni0876.fits
SUN_POSTN:        81.94d {+05h 27m 46s}  +23.23d {+23d 13' 46"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.80d {+05h 19m 12s}  +19.38d {+19d 23' 00"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [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).  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 13 Jun 18 15:54:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     840853,   Seg_Num: 0
GRB_RA:          211.5203d {+14h 06m 04.87s} (J2000),
                 211.8072d {+14h 07m 13.71s} (current),
                 210.7458d {+14h 02m 58.98s} (1950)
GRB_DEC:         -43.0722d {-43d 04' 19.9"} (J2000),
                 -43.1596d {-43d 09' 34.6"} (current),
                 -42.8339d {-42d 50' 02.0"} (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:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  56447.00 SOD {15:40:47.00} UT,   268.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        81.94d {+05h 27m 45s}  +23.23d {+23d 13' 46"}
SUN_DIST:        134.39 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.79d {+05h 19m 10s}  +19.38d {+19d 22' 56"}
MOON_DIST:       133.44 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.14, 17.73 [deg] galactic lon,lat of the burst
ECL_COORDS:      224.97,-28.34 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=6.20) 1.62 arcmin from the XRT position.  
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 13 Jun 18 15:55:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     840853,   Seg_Num: 0
POINT_RA:        211.551d {+14h 06m 12s} (J2000)
POINT_DEC:       -43.065d {-43d 03' 54"} (J2000)
ROLL:            260.990d
IMG_START_DATE:  18282 TJD;   164 DOY;   18/06/13
IMG_START_TIME:  57033.48 SOD {15:50:33.48} UT,   854.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     550597854
X_OFFSET:        935 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1095
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00840853000msuni0876.fits
SUN_POSTN:        81.94d {+05h 27m 46s}  +23.23d {+23d 13' 46"}
SUN_DIST:        134.41 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:       79.80d {+05h 19m 13s}  +19.38d {+19d 23' 01"}
MOON_DIST:       133.46 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      317.16, 17.73 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      224.99,-28.32 [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.  
COMMENTS:        There is a bright star (mag=6.20) 1.22 arcmin from the BAT position.

GCN Circular #22771
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 180613A, we find an enhanced XRT position of the afterglow: RA, Dec: 211.5204, -43.0722 which is equivalent to:
```
   RA (J2000)  = 14 06 04.89
   Dec (J2000) = -43 04 19.9
```
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/840853.
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 #22772
D. A. Kann and L. Izzo (HETH/IAA-CSIC) report:
Inspection of archival DSS images of the enhanced XRT position (error radius 2.0", Ecans, GCN #22771) of GRB 180613A (Tohuvavohu et al., GCN #22769) reveals a known source within the XRT error circle. This source is known in the USNO B1.0 catalog, and is also part of Gaia DR1/2 (source ID 6109389046377848320, with possible parallax of 0.98 +/- 0.62 mas, Gmag = 19.748). PS1 and SDSS do not cover this location.
It is not possible to determine from the DSS2 image if this source is stellar or slightly extended. We suggest this source may be the host galaxy of this GRB, but it could also be a foreground star, as the stellar density of this field is quite high.
GCN Circular #22773
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 615 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180613A, 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 = 211.52057, -43.07237 which is equivalent to:
```
RA (J2000): 14h 06m 4.94s
Dec (J2000): -43d 04' 20.5"
```
with an uncertainty of 4.9 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 #22774
K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester) and A. Tohuvavohu report on behalf of the Swift-XRT team:
We have analysed 8.3 ks of XRT data for GRB 180613A (Tohuvavohu et al. GCN Circ. 22769), from 155 s to 19.0 ks after the BAT trigger. The data comprise 95 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 22771).
The light curve can be modelled with a power-law decay with a decay index of alpha=2.05 (+0.07, -0.06).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.04 (+0.17, -0.16). The best-fitting absorption column is 1.5 (+1.1, -0.9) x 10^21 cm^-2, consistent with the Galactic value of 6.5 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.45 (+0.20, -0.19) and a best-fitting absorption column of 2.0 (+1.1, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.0 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.0 (+1.1, -0.9) x 10^21 cm^-2
Galactic foreground: 6.5 x 10^20 cm^-2
Excess significance: 2.5 sigma
Photon index:	     1.45 (+0.20, -0.19)
```
If the light curve continues to decay with a power-law decay index of 2.05, the count rate at T+24 hours will be 2.9 x 10^-5 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x 10^-15 (1.6 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00840853.
This circular is an official product of the Swift-XRT team.
GCN Circular #22775
C. C. Thoene (HETH/IAA-CSIC), N. Tanvir (Univ. of Leicester), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), D. A. Kann, L. Izzo (both HETH/IAA-CSIC), G. Pugliese (API/U. Amsterdam), P. Schady (MPE) and D. Xu (NAO/CAS) report on behalf of the Stargate consortium:
We observed the field of GRB 180613A (GCN 22769, Tohuvavohu et al.) with HAWKI at the VLT (ESO, Paranal, Chile) starting on June 13, 2018, at 22:51 UT (7.25 days after the burst). Imaging observations were obtained in J, H and Ks filters with exposure times of 11-12 min under thin clouds but excellent seeing conditions (around 0.4 arcsec) and preliminary reductions provided by the observatory.
The object reported in GCN 22772 (Kann & Izzo) is clearly detected and likely a foreground star. Inside the refined XRT error circle (GCN 22771, Evans) we detect a faint source in all three bands at the coordinates (errors +/-0.5 arcsec):
```
RA 14:06:04.89
DEC -43:04:19.6
```
The source seems to be slightly extended to the NW and a point-like source at the SW end of it. This could possibly be the underlying host + afterglow. Further observations are needed to determine a possible fading of the source. Preliminary photometry gives J =3D 22.86 +/- 0.25 mag using aperture photometry centered on the point-like part of the source and compared to field stars from the 2MASS catalogue.
We acknowledge the excellent support from ESO staff, in particular Fr=E9d==E9ric Vogt, Ivan Aranda and Stephane Brillant and enjoyed the great new option to chat on Skype with the telescope during the observations.
GCN Circular #22776
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), 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-239 to T+625 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180613A (trigger #840853) (Tohuvavohu et al., GCN Circ. 22769). The BAT ground-calculated position is RA, Dec = 211.545, -43.082 deg which is
```
  RA(J2000)  =  14h 06m 10.9s
  Dec(J2000) = -43d 04' 56.5"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows some weak emission that starts at ~T+25 s and ends at ~T+80 s. T90 (15-350 keV) is 50.8 +- 8.4 sec (estimated error including systematics).
Because this trigger occurred when BAT was in the process of resuming to normal operation from the recent reboot. The entire detector array had the lower level discriminators set to a value higher than the level of normal operations. Therefore, the standard spectral analyses are unavailable.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/840853/BA/
GCN Circular #22777
P. Schady, T. Schweyer, T.-W. Chen (all MPE Garching) and J. Bolmer (ESO Santiago) report:
We observed the field of GRB 180613A (Swift trigger 840853; Tohuvavohu et al., GCN #22769) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 23:30 UT on 2018-06-13, 7.9 hrs after the GRB trigger. They were performed at an average seeing of 1.5" and at an average airmass of 1.1.
We do not detect the HAWKI source reported by Thoene et al. (GCN #2275). However, we note that the larger 4.9 arcsec uncertainty on the enhanced XRT position (Beardmore et al., GCN #22773) now includes two, brighter sources that are below the sensitivity of the DSS images.
Source #1 lies at the SW edge of the enhanced XRT 90% error circle, at
```
RA = 14:06:05.24
Dec = -43:04:21.6
```
with a preliminary magnitude r' = 23.1 +/- 0.1 mag.
Source #2 lies at the NW edge of the enhanced XRT error circle, at
```
RA = 14:06:05.24
Dec = -43:04:21.6
```
with r' = 22.9 +/- 0.1 mag. The above positions have an accuracy of 0.1" in both directions.
Our g' band photometry is strongly affected by a nearby 5.6 mag star located SW of the GRB position, but source #1 is detected in all other GROND bands. Source #2 is detected in r', i' and z'. Our observations at the position of the XRT afterglow have preliminary 3 sigma upper limits of
```
r' > 23.7 mag
i' > 22.8 mag
z' > 22.7 mag
J > 21.5 mag
H > 21.0 mag
K > 20.4 mag
```
All quoted magnitudes are in the AB system and are calibrated against GROND zeropoints and 2MASS field stars. They are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.08 in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN Circular #22778
P. Schady (MPE, Garching) reports:
We note a mistake in the position reported for source #2 in Schady et al. (GCN #22777), which should have been
```
RA =3D 14:06:04.69
Dec =3D -43:04:17.7
```
There was also a mistake in our reference to Thoene et al. which should be GCN=A0#22775, rather than GCN #2275.
We apologise for any confusion that this error may have caused.
GCN Circular #22779
S. Sebzda (PSU) and A. Tohuvavohu (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180613A 156 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 22769). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 22773) 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

u_FC               156          405          246         >20.4
v                  461        24234         1434         >20.9
b                  411        13230         1022         >99.0
u                  156        18973         2109         >21.8
w1                 510        18472         2212         >21.2
m2                 486        24474         1627         >21.0
w2                1036        23321         1318         >20.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22820
C.C. Thoene (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), N.R. Tanvir (Univ. of Leicester), D.A. Kann, L. Izzo (both HETH/IAA-CSIC), J.P.U. Fynbo (DAWN/NBI) and D.B. Malesani (DAWN/NBI, DARK/NBI) report on behalf of the Stargate consortium:
We re-observed the field of GRB 180613A (Tohuvavohu et al., GCN 22769) with HAWK-I/VLT on 14 June 2018 at 23:37 UT (32.02 hr after the burst). The observation consisted of a combined exposure of 36 min in the J-band. The seeing of this observation was worse than during the first epoch (Thoene et al., GCN 22775) with an average value of 0.8", but the exposure time was significantly longer, allowing us to reach a deeper limit. In this second epoch we do not detect any more the source found by Thoene et al. (GCN 22775) down to a 3-sigma limit of J(Vega) > 24.2 mag. This implies that the source has faded, confirming that this source was indeed the afterglow of GRB 180613A.
We also revise and provide the full photometry of our first HAWK-I epoch (GCN 22775, Thoene et al.) and obtain the following values:
```
J(Vega)=23.24+/-0.26 or J(AB)=24.15+/-0.26
H(Vega)=22.23+/-0.22 or H(AB)=23.62+/-0.22
Ks(Vega)=21.04+/-0.27 or Ks(AB)=22.89+/-0.27
```
These values result in an IR spectral slope of 2.02 +/- 0.64, which would indicate a significant amount of extinction, explaining the faintness of the afterglow. Due to the lack of further data, we are not able to draw any definite conclusions in this matter.
We acknowledge the continued excellent support from the ESO staff, in particular Frederic Vogt, Ivan Aranda and Eleonora Sani.
GCN Circular #22841
A. Cucchiara, D. Morris (U. Virgin Islands), C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), report report on behalf of a larger collaboration:
"On June 13.84 UT (T_0 +4.5 hours) we began observing the center of the field of GRB 180613A (Tohuvavohu et al. GCN 22769, Beardmore et al. GCN 22773) using the Las Cumbres Observatory 1m telescope located South Africa Astronomical Observatory.
We performed a series of 5x120s observations in SDSS-i' and SDSS-r' band for a total of 20 minutes on sky.
In the full median stacked i'-band images we clearly identified the NIR counterpart reported by Thoene et al. (GCN #2275, #22820). This object is also marginally detected in our r' band stack.
We estimate the following brightness for the optical counterpart:
i' = 19.3 +- 0.6
We caution the usage of this measurement due to the high sky background near the GRB location caused by the presence of the nearby by a nearby 5.6 mag star (Schady et al. GCN #22777).
This magnitude is calibrated against nearby UCAC4 sources, and is not corrected for Galactic extinction."

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Jochen Greiner, last update: 25-Jun-2018 [Disclaimer]