[vsnet-grb-info 6628] GRB 080915: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8232
SUBJECT: GRB 080915: Swift/UVOT Upper Limits
DATE:    08/09/15 13:39:55 GMT
FROM:    Alice Breeveld at MSSL-UCL  <aad at mssl.ucl.ac.uk>

A. Breeveld (MSSL-UCL) and S.R. Oates (MSSL-UCL) report on behalf of the
Swift/UVOT team:

The Swift/UVOT observed the field of GRB 080915 (Oates et al., GCN Circ.
8227) with settled exposures starting 3872s after the trigger. We do not
find a source in any of the UVOT observations inside the XRT error
circle (Evans et al., GCN Circ. 8231). The 3-sigma upper limits in the
UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for
detecting a source in the first white finding chart exposure and
subsequent co-added exposures are:

Filter          T_start T_stop  Exp     Mag (3-sigma UL)
                  (s)     (s)     (s)
=========================================================
white (FC)      3872    3972    98.2    > 19.9
white           5004    5204    196.6   > 20.5
v               3979    4179    196.6   > 18.8
v               9633    10539   885.1   > 19.7
b               4799    4999    196.6   > 19.6
u               4594    4794    196.6	> 19.1
uvw1            4389    4589    196.6	> 19.3
uvm2            4184    11087   731.3   > 20.4
uvw2            5210    5329    117.3	> 19.6

The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.049 mag in the
direction of the burst (Schlegel et al. 1998).