[vsnet-grb-info 6658] GRB 080916C: Swift UVOT Refined Analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8262
SUBJECT: GRB 080916C: Swift UVOT Refined Analysis
DATE:    08/09/17 17:59:31 GMT
FROM:    Erik Hoversten at Swift/Penn State  <hoversten at astro.psu.edu>

E. A. Hoversten (PSU), P. Schady (MSSL-UCL), and M. Perri (ASDC)
report on behalf of the Swift UVOT team:

The Swift/UVOT began observations of the field of GRB 080916C 17.0
hours after the Fermi GBM dectection (Goldstein & van der Horst, GCN
8245). No afterglow is detected within the XRT error circle (Evans, et
al., GCN 8255) in any of the observed UVOT filters.

UVOT magnitude 3-sigma upper limits are reported in the following
table:

Filter   T_start   T_stop   Exp(s)  Mag (3-sigma upper limit)
-------------------------------------------------------------
v         101253   101857     590        > 19.75
u          96469    97132     645        > 19.99
uvw1       66675    67517     829        > 20.34
uvw1       95562    96462     886        > 20.38
uvm2       61130    66667    1090        > 20.31
uvm2       94655    95555     886        > 20.20
uvw2      100347   101246     886        > 20.43

The quoted upper limits have not been corrected for the large expected
Galactic extinction along the line of sight of E_{B-V} = 0.32 mag
(Schlegel et al., 1998).  All photometry is on the UVOT flight system
described in Poole et al. (2008, MNRAS, 383, 627).