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GCN Circular 7253

Subject
GRB 080205: Swift/UVOT observations
Date
2008-02-05T16:16:32Z (16 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R. Oates (MSSL-UCL) and C.B Markwardt (CRESST/GSFC/UMD) report
on behalf of the UVOT team.

The Swift/UVOT observed the field of GRB 080205 (trigger #302506)
starting 111 seconds after the BAT trigger (Markwardt et al., GCN
Circ. 7250). We detect the optical afterglow at the position:

RA  (J2000) = 06:33:00.62
Dec (J2000) =+62:47:31.98

with an error of about 0.5". This is consistent with the position
reported by Li et al.(GCN 7251) and lies within the revised
XRT error circle (Osborne et al., GCN 7252).

The optical afterglow initially brightens in the first few hundred seconds
after the trigger and then begins to decay at around ~T+1000s. The
afterglow is detected in the white and v filters only. The lack
of detection in the b, u and uv filters suggests that this GRB is
at a z ~ 4.0.

The magnitudes and 3-sigma upper limits are listed:

Filter    Tstart(s) Tstop(s) Exp    Magnitude
--------------------------------------------------------------
white       111	    211	      98   20.37 +/- 0.28 (3.7-sigma)
             864	    964	      98   19.76 +/- 0.17 (6.2-sigma)
             5436    5636     196   20.59 +/- 0.25 (4.2-sigma)
v           217     617	     393   18.07 +/- 0.09 (11.4-sigma)
             970	    1370     393   19.02 +/- 0.20 (5.4-sigma)
b           697     686	     451   20.83   (3 sigma UL)
u           672     6664     471   20.45   (3 sigma UL)
uvw1        647     6458     286   20.13   (3 sigma UL)
uvm2        622     7525     329   20.03   (3 sigma UL)
uvw2        727     7279     452   20.39   (3 sigma UL)
--------------------------------------------------------------

The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.091 mag in the
direction of the burst (Schlegel et al. 1998).
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