GCN Circular 8669
Subject
Possible GRB 081211B: Swift/UVOT Upper Limits
Event
Date
2008-12-15T17:27:44Z (17 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
S. T. Holland (CRESST/GSFC/USRA) reports, on the behalf of the Swift
UVOT team:
The Swift/UVOT observed the field of the possible BAT Slew
Survey burst GRB 081211B (Copete et al., GCN Circ. 8661) starting 81.7
ks after the start of the slew that this source was detected in. We
find no new source, relative to the DSS, USNO-B1.0, or 2MASS, or a
variable source, inside the UVOT-enhanced XRT error circle (Page et
al. 2008, GCN Circ. 8666). Preliminary 3-sigma upper limits for
detecting a source in the co-added images, using an aperture-corrected
2.5 arcsecond radius circular aperture, are
Filter T_start T_stop Exp(s) Mag
------------------------------------------
v 81,651 132,774 2318 >21.4
b 85,687 126,980 1770 >22.5
uvm2 132,780 133,265 478 >20.8
uvw2 87,513 128,664 1426 >21.8
white 86,600 127,893 1770 >23.1
------------------------------------------
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a
reddening of E_{B-V} = 0.01 mag (Schlegel et al., 1998, ApJS, 500,
525). All photometry is on the UVOT photometry system described in
Poole et al. (2008, MNRAS, 383, 627).