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GCN Circular 30025

Subject
GRB 210514A: Swift/UVOT Upper Limits
Date
2021-05-16T15:01:02Z (3 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
A. Belles (PSU) and E. Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210514A
80 s after the BAT trigger (Ambrosi et al., GCN Circ. 30008).
No optical afterglow consistent with the XRT position
(Osborne et al., GCN Circ. 30011) 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           80          229          147            >20.85
u_FC                293          543          245            >20.12
white               573         1366          225            >21.00
v                      622         1415           97            >18.87
b                     548         1342           77            >19.73
u                     696         5458          210            >19.99
w1                  672         5299          278            >19.59
m2                  646         1440           97            >18.41
w2                  598         1391           97            >18.52

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.022 in the direction of the burst
(Schlegel et al. 1998).
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