[vsnet-grb-info 15605] GRB 141005A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16894
SUBJECT: GRB 141005A: Swift/UVOT Upper Limits
DATE:    14/10/05 17:20:24 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and V. D'Elia (ASDC) report on behalf of the
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141005A
94 s after the BAT trigger (D'Elia et al., GCN Circ. 16882).
This GRB was observed also by Fermi GBM (Roberts, GCN Circ. 16889), and
in the r and i bands (P60: Perley et al., GCN Circ. 16884, RATIR:
Littlejohn et al.,GCN Circ. 16885). A nearby galaxy was reported by
Perley et al., and is also seen in the UVOT images.
No optical afterglow consistent with the XRT position (Beardmore et
al. GCN Circ. 16888), or the P60 position is detected in the initial
UVOT exposures, although the event data for the UVOT b-band show a
slight brightening peaking around T+700s..
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

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

u_FC                94          344          246         >20.1
v                 5960         7392          393         >19.4
b                  349         6980          639         >20.2
u                   94         6775          786         >20.6
w1                5138         6570          393         >19.9
m2                4932         7445          441         >20.2
w2                5754         7186          393         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).