[vsnet-grb-info 13797] GRB 130816A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Aug 20 04:50:37 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 15111
SUBJECT: GRB 130816A: Swift/UVOT Upper Limits
DATE: 13/08/19 19:49:29 GMT
FROM: Stephen Holland at STScI <sholland at stsci.edu>
S. T. Holland (STScI) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB
130816A starting 91 s after the BAT trigger (Holland et al. 2013, GCNC
15097). We do not detect any new source consistent with the REM
afterglow position (Covino et al. 2013, GCNC 15098) in any of the UVOT
exposures. Preliminary 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
for the finding chart (FC) exposures and initial summed exposures are
presented below.
---------------------------------------------------
Filter TSTART TSTOP Exposure Mag
---------------------------------------------------
white (FC) 91 241 147 >20.8
u (FC) 303 554 246 >19.9
---------------------------------------------------
v 633 1924 156 >19.2
b 559 1850 136 >20.0
u 707 1825 117 >19.5
uvw1 682 1801 117 >19.3
uvm2 658 1944 151 >19.4
uvw2 609 1900 156 >19.7
white 584 1875 284 >21.1
---------------------------------------------------
The quoted upper limits have not been corrected for the expected
extinction due to the Galactic reddening along the line of sight to
this burst of E(B-V) = 0.70 mag (Schlafly et al. 2011, ApJS, 737,
103). GRB 130816A was 4 degrees above the Galactic Plane, so this
extinction value is highly uncertain.
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