GCN Circular 11817
Subject
GRB 110319B: Swift/UVOT Upper Limits
Date
2011-03-21T21:07:01Z (13 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110319B
27685 s after the Fermi/GBM trigger (Cummings et al., GCN Circ. 11813).
No optical afterglow consistent with the XRT position
(Sbarufatti, GCN Circ. 11814) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 28512 35117 1570 >21.8
v 29340 35964 1678 >20.0
u 27685 34323 1597 >20.8
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).