GCN Circular 29787
Subject
GRB 210410A: Swift/UVOT Upper Limits
Event
Date
2021-04-10T21:16:09Z (5 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Paul Kuin (MSSL/UCL) and A. Melandri(INAF-OAB) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210410A
(trigger 01042113; previously reported by Fermi/GBM in GCN #29777)
1113 s after the Fermi trigger at 2021-04-10 00:53:16 UT.
No optical afterglow consistent with the XRT position (Melandri et
al. GCN Circ. 29778) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) mag 3-sigma UL
v 1129 1149 19 >17.0
b 5021 5109 85 >19.7
u 4817 5014 197 >19.9
w1 4610 4809 197 >19.3
m2 4403 4602 197 >19.4
w2 1113 1125 12 >17.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).