GCN Circular 7375
Subject
GRB 080307: Swift/UVOT Upper Limits
Date
2008-03-07T20:20:40Z (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 GRB 080307 starting 105 s
after the BAT trigger (Holland et al. 2008, GCN Circ. 7362). We do not
find any source, in any of the UVOT observations, at the location of
the Gemini-North source (Tanvir, 2008 GCN Circ. 7369).
The 3-sigma upper limits for detecting a source at this
location in the co-added images are:
Filter T_start T_stop Exp(s) Mag (3-sigma upper limit)
-----------------------------------------------------------------
v 212 5754 676 >20.7
b 691 6574 412 >21.4
u 666 6369 432 >21.1
uvw1 642 6164 432 >20.9
uvm2 618 5959 413 >20.6
uvw2 721 6816 245 >20.7
white 105 6779 599 >22.3
-----------------------------------------------------------------
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} = 0.03 mag. All photometry is on the UVOT flight
system described in Poole et al. (2008, MNRAS, 383, 627).