GCN Circular 12354
Subject
GRB 110915B: Swift/UVOT Upper Limits
Date
2011-09-16T21:12:10Z (13 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (GSFC/UMBC/CRESST)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110915B
36,747 s after the AGILE trigger (Del Monte et al., GCN Circ. 12341).
No optical afterglow consistent with the position of the X-ray
(D'Avanzo et al. GCN Circ.12348) or optical (de Ugarte Postigo et al.,
GCN Circ. 12350) afterglow candidates 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 37077 48670 1468 >22.2
v 42882 48935 542 >20.1
u 36747 52898 1869 >22.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).