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GCN Circular 7693

Subject
GRB080506: Swift/UVOT observations
Date
2008-05-07T16:22:15Z (16 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R. Oates (MSSL/UCL) and W. Baumgartner (NASA/GSFC) report on behalf of 
the Swift/UVOT team

The Swift/UVOT began settled observations of the field of GRB 080506, 143s 
after the BAT trigger (Baumgartner et al., GCN 7685). We detect the 
afterglow in the v and b filters at the position:

RA(J2000.0)  =   21:57:41.84
DEC(J2000.0) =  +38:59:06.1

with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence).
This position is consistent with the UVOT enhanced XRT position (Osborne 
et al., GCN 7687) and the TLS position (Kann et al., GCN 7688).

No observations were performed with the white filter due to the presence 
of 7.5mag B star (HD 208837) 6 arcmins from the GRB position.

UVOT magnitudes and 3 sigma upper limits are reported below for the single
and coadded images:

Filter    Tstart(s)  Tstop   Expo(s)   Magnitude/3sigUL
-----------------------------------------------------
v            143     543     393       18.35 +/- 0.10
v           6728    6928     197       19.88 +/- 0.52
b            623     771      19       19.84 +/- 0.65 (1.7-sigma)
b          10818   11118     295       20.64 +/- 0.28 (3.8-sigma)
u            599    6311     254       > 20.29
w1           574    7338     471       > 20.44
m2          1284    7133     787       > 20.69
w2           639    6723     432       > 20.46
-----------------------------------------------------

These magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E{B-V} = 0.23 mag (Schlegel et al.
1998). The photometry is on the UVOT flight system described in Poole
et al. (2008,MNRAS,383,627).
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