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GCN Circular 7375

Subject

GRB 080307: Swift/UVOT Upper Limits

Date

2008-03-07T20:20:40Z (16 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. 7362Not found
 
 
).  We do not
find any source, in any of the UVOT observations, at the location of
the Gemini-North source (Tanvir, 2008 GCN Circ. 7369Not found
 
 
).

        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).