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GCN Circular 6378

Subject
GRB070506: Swift/UVOT Observations
Date
2007-05-07T02:58:56Z (17 years ago)
From
Wayne Landsman at GSFC/SSAI <landsman@milkyway.gsfc.nasa.gov>
W. Landsman (SSAI/GSFC) and C. Pagani (PSU) report on behalf of the 
Swift/UVOT team:

The Swift/UVOT began taking data in the field of GRB070506 459s after 
the BAT trigger (Pagani et al., GCN 6375). A fading afterglow is weakly 
detected in the White, B and V UVOT  filters, but not in the U or UV 
filters.      We use the combined white image to obtain an improved 
position of

RA(J2000) = 23h 08m 52.39s  Dec(J2000) = +10d 43' 20.8"

with a 1-sigma uncertainty radius of about 0.5".    This is 0.5" from 
the UVOT position reported by Pagani et al. (GCN 6375) and 2.9" from the 
refined XRT position reported by Pagani et al. (GCN 6377).

Photometry results are given for the 7 UVOT filters below.

           Tstart   Tstop    Exp          Mag

White        459      558      98         19.7+/-0.18
             868      967      98         19.9+/-0.22
            7371     7570     196         20.4+/-0.28

V            974     1373     393         19.1+/-0.2
            7781     7980     197        >19.3 (3 sigma)
 
B            638     2245     136         19.8+/-0.34
            7167     7366     197        >20.4 (3 sigma)

U            638     5853     261        >20.1 (3 sigma)
UVW1         614     5741     352        >20.4 (3-sigma)
UWM2        7984     8142     155        >19.6 (3-sigma)
UVW2         840     7775     294        >20.4 (3-sigma)

No correction has been made for the expected Galactic reddening of 
E(B-V)=0.04
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