GCN Circular 6009
Subject
GRB 070110: UVOT Observations of a Candidate Afterglow
Date
2007-01-11T00:29:04Z (18 years ago)
From
Pete Roming at PSU <roming@astro.psu.edu>
P. Roming (PSU), P. T. Boyd, and H. Krimm (NASA/GSFC) report on behalf of
the Swift UVOT team:
The Swift/UVOT began settled observations of GRB 070110 104 seconds after
the BAT trigger (Krimm et al., GCN Circ.6005). Analysis of the merged
Swift/UVOT data obtained on 2007-01-10 shows that the candidate optical
afterglow was detected in the White, V, B, and U filters, but not in the UV
filters. The photometry results are given for the 7 UVOT filters below:
Filter Tstart Tstop Exp Mag Error Significance
White 104 5882 590 20.0 0.14 9.1
V 210 23205 2065 20.3 0.20 5.7
B 4046 29593 1568 20.9 0.17 7.1
U 5274 35376 3166 20.4 0.10 11.6
UVW1 5069 34757 3758 20.8 (3-sigma UL)
UVM2 4864 33850 2739 21.1 (3-sigma UL)
UVW2 4456 39315 1853 20.9 (3-sigma UL)
There is marginal evidence for fading of the optical candidate but
confirmation of its fading is pending further analysis. The values quoted
above are not corrected for the expected extinction corresponding to E(B-V)
of 0.014.