GCN Circular 5735
Subject
GRB 061019: Swift/UVOT upper limit
Date
2006-10-19T20:59:38Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and C. Guidorzi (Univ Bicocca&INAF-OAB)
report on behalf of the Swift-UVOT team:
The Swift UVOT began observing the GRB 061019 field (trigger 234516) 2790
seconds after the BAT trigger (Guidorzi et al. GCN Circ. 5728). Exposures
were taken with the V, B, U, W1, M2, and W2 filters. No new source was detected
within the XRT error circle (Guidorzi et al. GCN Circ. 5733).
The effects of a nearby bright star complicate the analysis, but
we estimate a 3-sigma upper limit of ~19th magnitude at the position
of the optical afterglow (Covino et al. GCN Circ. 5730; Cobb et al. GCN Circ. 5734)
for the initial exposure with the V filter.