TITLE: GCN CIRCULAR NUMBER: 43702 SUBJECT: GRB 260228A: Swift UVOT detection DATE: 26/02/11 17:42:26 GMT FROM: Paul Kuin at MSSL <npkuin@gmail.com> 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 y. v 36195.1 47089.2 938 20.01 +/-0.32 View this GCN Circular online at https://gcn.nasa.gov/circulars/43702. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...