GCN Circular 30040
Subject
GRB 210517A: Swift/UVOT Upper Limits
Event
Date
2021-05-17T17:35:58Z (5 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 210517A: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and V. D'Elia (SSDC & INAF-OAR)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210517A
69 s after the BAT trigger (D'Elia et al., GCN Circ. 30032).
No optical afterglow consistent with the optical position
(Tanvir et al. GCN Circ. 30037)
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 69 219 147 >19.4
u_FC 282 531 246 >19.7
white 69 1356 373 >19.9
v 611 5047 274 >19.0
b 537 1332 78 >19.5
u 282 1307 304 >19.7
w1 661 1109 39 >18.4
m2 5052 5070 18 >18.7
w2 4642 4841 197 >21.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.011 in the direction of the burst
(Schlegel et al. 1998).