[vsnet-grb-info 13796] GRB 130816B: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Aug 20 04:48:18 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 15110
SUBJECT: GRB 130816B: Swift/UVOT Upper Limits
DATE: 13/08/19 19:48:10 GMT
FROM: Stephen Holland at STScI <sholland at stsci.edu>
S. T. Holland (STScI) and M. Stamatikos (OSU/NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB
130816B starting 75 s after the BAT trigger (Stamatikos et al. 2013,
GCNC 15099). We do not detect any new source consistent with the
GROND afterglow position (Varela et al. 2013, GCNC 15107) 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) 75 225 147 >20.7
u (FC) 287 537 246 >19.9
---------------------------------------------------
v 618 12,639 1295 >20.4
b 543 7299 530 >20.7
u 692 19,298 923 >20.5
uvw1 667 18,676 1238 >20.8
uvm2 642 13,534 1227 >20.8
uvw2 593 24,128 882 >20.7
white 567 7498 672 >21.5
---------------------------------------------------
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) = 0.50 mag (Schlafly et al. 2011, ApJS, 737,
103). GRB 130816B was 3 degrees above the Galactic Plane, so this
extinction value is highly uncertain.
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