[vsnet-grb-info 9355] GRB 100614A: Swift detection of a burst

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10837
SUBJECT: GRB 100614A: Swift detection of a burst
DATE:    10/06/14 22:09:01 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

G. Stratta (ASDC), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), V. D'Elia (ASDC),
J. M. Gelbord (PSU), C. Gronwall (PSU),
S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL),
W.B Landsman (GSFC), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC),
J. P. Osborne (U Leicester), T. Sakamoto (NASA/UMBC),
C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/IASFPA),
M. Stamatikos (OSU/NASA/GSFC), T. N. Ukwatta (GSFC/GWU) and
L. Vetere (PSU) report on behalf of the Swift Team:

At 21:38:26 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 100614A (trigger=424716).  Swift slewed immediately to the burst. 
The BAT on-board calculated location is 
RA, Dec 263.519, +49.227, which is 
   RA(J2000)  =  17h 34m 05s
   Dec(J2000) = +49d 13' 36"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  As is typical for image triggers, the TDRSS
lightcurve does not show anything significant. 

The XRT began observing the field at 21:40:39.1 UT, 133.0 seconds after
the BAT trigger. Using promptly downlinked data we find a bright,
fading, uncatalogued X-ray source with an enhanced position: RA, Dec
263.4992, 49.2347 which is equivalent to:
   RA(J2000)  = 17h 33m 59.81s
   Dec(J2000) = +49d 14' 05.1"
with an uncertainty of 2.1 arcseconds (radius, 90% containment). 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 (2.2e+20
cm^-2, Kalberla et al. 2005), with an excess column of 1.3
(+1.11/-1.03) x 10^21 cm^-2 (90% confidence). 

The initial flux in the 0.1 s image was 4.41e-08 erg cm^-2 s^-1 (0.2-10
keV). 

UVOT took a finding chart exposure of nominal 250 seconds with the U filter
starting 873 seconds after the BAT trigger.  No white observations were taken
because there is a V = 7.4 star in the UVOT field of view.  The UVOT image covers
100% of the XRT error circle.  No credible afterglow candidate has been found in 
the initial data products to an estimated magnitude limit of u > 19.2.  No 
correction has been made for the expected extinction  corresponding to E(B-V) of 
0.03 mag. 

Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). 
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)