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GCN Circular 9652

Subject
GRB 090709A: Swift UVOT upper limits
Date
2009-07-10T20:34:40Z (14 years ago)
From
Erik Hoversten at Swift/Penn State <hoversten@astro.psu.edu>
T. A. Pritchard (PSU), E. A. Hoversten (PSU) and D. C. Morris (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began observing the field of GRB 090709A, 77 seconds
after the BAT trigger (Morris et al., GCN 9625). We do not detect any
source at the Swift enhanced XRT position (Osborne et al., GCN 9636).

The 3-sigma upper limits in each filter are:

Filter   T_start(s)   T_stop(s)   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
white(FC)    77          227       150       > 21.03
v          4697         4897       200       > 19.59
b          4081         4281       200       > 20.01
u           290          471       181       > 20.09
uvw1       5107	        5307       200	     > 19.83
uvm2       4902	        5102       200       > 19.63
uvw2       4492	        4692       200       > 19.85
-------------------------------------------------------------

The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.09 mag.
All photometry is on the UVOT photometric system described in Poole et
al. (2008, MNRAS, 383, 627).
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