GCN Circular 43702
Subject
GRB 260208A: Swift UVOT detection
Event
Date
2026-02-11T17:42:26Z (a day ago)
Edited On
2026-02-12T13:47:33Z (6 hours ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Paul Kuin at MSSL <npkuin@gmail.com>
Via
email
Paul Kuin (MSSL/UCL) and Brad Cenko (NSA/GSFC) reports on behalf of
the Swift/UVOT team:
The Swift/UVOT began observations of the Fermi-detected GRB 260208A
35.4 ks after the Fermi Trigger (Fermi GBM team, GCN Circ. 43635;
Longo et al., GCN Circ. 43645). We detect the afterglow at the position
given by Podesta et al., GCN Circ. 43640. 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 35662.9 41566.1 1208 20.84 +/-0.10
white 46325.8 47072.6 735 21.45 +/-0.21
u 35131.3 40857.7 1208 20.34 +/-0.14
u 45572.3 46319.1 735 20.12 +/-0.15
v 36195.1 47089.2 938 20.01 +/-0.32