GCN Circular 28222
Subject
GRB 200806A: Swift/UVOT Possible Detection
Date
2020-08-07T17:37:59Z (5 years ago)
From
Frank Marshall at Swift/UVOT <marshall@milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and E. Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200806A
86 s after the BAT trigger (Ambrosi et al., GCN Circ. 28211).
A source consistent with the enhanced XRT position
(Beardmore et al. GCN Circ. 28214)
is marginally detected in the initial UVOT exposures.
The preliminary detection and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 86 236 147 20.26 +/- 0.28
v 629 821 39 >17.9
b 555 747 39 >19.3
u 300 722 265 >19.5
w1 678 870 39 >18.8
m2 653 845 39 >19.4
w2 604 1052 58 >19.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.42 in the direction of the burst
(Schlegel et al. 1998).