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GCN Circular 6751

Subject

GRB 070809: Swift/UVOT Corrected Photometry

Date

2007-08-10T20:54:59Z (17 years ago)

From

Margaret Chester at PSU <chester@astro.psu.edu>

M.M. Chester (PSU) and F.E. Marshall (NASA/GSFC) report on behalf of the
Swift UVOT team:

We have identified an additional exposure of GRB 070809 made by the 
Swift/UVOT that covers the XRT error circle, and can now provide an
optical upper limit at a much earlier time, 74 seconds after the BAT
trigger.  In addition, an error in the photometry analysis previously 
reported (Chester et al., GCN Circ. 6744Not found
 
 
) has been identified, and 
corrected upper limits are reported below.

Filter   Tstart   Tstop    Exp     Magnitude
           (s)      (s)     (s)    (3-sigma UL)
v (FC)     74      474    394       19.1
v        6344    18560   1251       20.2
b        5932    24593    614       20.4
u        5727    24363   1911       20.6
uvw1     5523    23449   2164       20.6
uvm2     5317    19316   2018       21.0
uvw2     6139    17646   1279       20.6