TITLE: GCN CIRCULAR NUMBER: 11718 SUBJECT: GRB 110213A: Swift/UVOT refined analysis DATE: 11/02/13 22:57:40 GMT FROM: Paul Kuin at MSSL N.P.M. Kuin (MSSL/UCL) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 110213A 100 s after the BAT trigger (D'Elia et al., GCN Circ. 11705). This GRB was reported by many observers. We see an initial peak around T+300s after which the GRB declines in brightness until around T+1500s when a small rebrightening occurs. A tentative redshift was reported by P.A. Milne (GCN Circ. No 11708) of z=1.46, which is consistent with the much fainter magnitudes we find in the uvm2 and uvw2 filters. The refined uvot position (90% confidence limit, 0.5" accuracy) with reference to USNO-B1 is: RA (J2000) = 02h 51m 51.39s DEC (J2000) = 49d 16' 23.54" Preliminary magnitudes and 3-sigma upper limits in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposures and summed with subsequent exposures up to about 2500s are: Filter T_start(s) T_stop(s) Exp(s) Mag (VEGA) white_FC 100 250 147 16.36 +/- 0.05 u_FC 312 562 246 15.54 +/- 0.04 white 100 2579 517 16.57 +/- 0.01 v 642 2455 227 16.19 +/- 0.04 b 568 2206 178 16.77 +/- 0.03 u 312 2529 448 15.94 +/- 0.02 uvw1 692 2505 198 17.28 +/- 0.08 uvm2 667 2479 218 18.72 +/- 0.20 uvw2 618 2606 238 19.10 +/- 0.18 The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.32 in the direction of the burst (Schlegel et al. 1998).