GCN Circular 27730
Subject
GRB 200512A: Swift/UVOT Upper Limits
Date
2020-05-13T16:56:49Z (4 years ago)
From
Frank Marshall at Swift/UVOT <marshall@milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200512A
78 s after the BAT trigger (Simpson et al., GCN Circ. 27726).
No optical afterglow consistent with the enhanced XRT position
(Goad et al., GCN Circ. 27728) 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
white_FC 78 228 147 >19.9
u_FC 236 486 246 >19.8
v 567 760 39 >17.1
b 493 858 58 >19.0
u 236 833 285 >19.7
w1 617 809 39 >17.9
The magnitudes in the table 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).