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GCN Circular 8012

Subject

GRB 080723A: Swift/UVOT Upper Limits

Date

2008-07-24T14:32:06Z (16 years ago)

From

Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>

S. T. Holland (CRESST/GSFC/USRA) and M. Stamatikos (NASA/ORAU) report
on the behalf of the Swift UVOT team:

         The Swift/UVOT observed the field of GRB 080723A starting 68 s
after the BAT trigger (Stamatikos et al. 2008, GCN Circ. 8000Not found
 
 
).  We do
not find any source, in any of the UVOT observations, at the
UVOT-enhanced XRT position of the afterglow (Beardmore 2008, GCN
Circ. 8001Not 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          194     6260     1040    >20.1
    b          674     7080      451    >20.6
    u          649     6874      471    >20.4
   uvw1        625     6670      469    >20.3
   uvm2        600     6465      467    >20.1
   uvw2        704     7468      430    >20.4
  white         88     7284      628    >21.4
-----------------------------------------------------------------

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} = 1.3 mag.  All photometry is on the UVOT flight
system described in Poole et al. (2008, MNRAS, 383, 627).