GCN Circular 10570
Subject
GRB 100401A: Swift/UVOT Upper Limit
Date
2010-04-03T04:46:02Z (14 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M.M. Chester (PSU) and G. Stratta (ASDC) report on behalf of the
Swift/UVOT team:
Swift began a Target of Opportunity observation of GRB 100401A,
detected by Swift/BAT (Cummings et al., GCN Circ. 10567) and by
Fermi/GBM (Goldstein and Gruber, GCN Circ. 10568), on April 2nd,
2010 at 19:33:04 UT, approximately 36 hours after the Swift/BAT
trigger.
No optical afterglow consistent with the BAT position is detected
in the UVOT exposure. The 3-sigma upper limit using the UVOT
photometric system (Poole et al. 2008, MNRAS, 383, 627) is:
Filter T_start(s) T_stop(s) Exp(s) 3-sig UL (mag)
u 131128 133123 1963 >20.8
The value quoted above is not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.29 in the direction of the burst
(Schlegel et al. 1998).