GCN Circular 8430
Subject
Swift UVOT observations of GRB081028
Date
2008-10-28T12:41:00Z (16 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and C. Guidorzi (INAF-OAB) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 081028
201s after the BAT detection (Guidorziet al., GCN Circ. 8421). No
source is detected in any of the individual or coadded exposures in
any of the UVOT filters at the XRT position (GCN Circ. 8427), or at
the position of the reported optical counterpart (GCN Circ. 8424, GCN
Circ. 8425). The 3 sigma upper limits at the position of the optical
counterpart for the first white finding chart (fc) and in consequent
co-added observations are reported below (where T_start and T_stop
represent the elapsed time since the BAT trigger in seconds).
Filter T_start(s) T_stop(s) Exp(s) 3 sigma Upper Limit
white 201 350 146 > 20.95
white 481 846 58 > 20.05
v 357 722 58 > 18.50
b 456 821 58 > 19.33
u 432 796 58 > 18.98
uvw1 407 771 58 >19.01
uvm2 382 746 58 >18.70
uvw2 506 868 55 >19.01
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E(B-V) = 0.03 mag (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383,627).