[vsnet-grb-info 9282] GRB 100514A: Swift/UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10766
SUBJECT: GRB 100514A: Swift/UVOT Observations
DATE:    10/05/15 16:12:01 GMT
FROM:    Frank Marshall at GSFC  <marshall at milkyway.gsfc.nasa.gov>

F.E. Marshall (NASA/GSFC) and C.B. Markwardt (CRESST/GSFC/UMD)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 100514A
110 s after the BAT trigger (Markwardt et al., GCN Circ. 10759).
There is a marginal (2.6-sigma) detection of a possible optical
afterglow at the enhanced XRT position
(M.R. Goad et al., GCN Circ. 10762) in the first white finding chart.
There is no detection in any of the other initial UVOT exposures.
Preliminary results (3-sigma upper limits or values with 1-sigma uncertainties) 
using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the finding chart (FC)
exposures and summed subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           110          260          147         21.1 +/- 0.3
u_FC               268          518          246         >20.2
white              549         7708          516         >21.0
v                  600         6843          529         >20.0
b                  524         7666          529         >20.5
u                  268         7459          775         >20.5
w1                 650         7254          529         >21.0
m2                 624         7048          529         >20.2
w2                 574         6639          352         >19.9

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).