GCN Circular 19795
F. E. Marshall (NASA/GSFC) and C. B. Markwardt (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT has discovered an optical afterglow for GRB 160815A (Markwardt et al., GCN Circ. 19794) in an exposure with the white filter. The preliminary UVOT position is: RA (J2000) = 19:14:09.63 = 288.5401 (deg.) Dec (J2000) = +84:18:50.4 = 84.3140 (deg.) with an estimated uncertainty of 1.0 arcsec. (radius, 90% confidence). The preliminary magnitude using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) is: Filter T_start(s) T_stop(s) Exp(s) Mag white 863 1013 150 19.1 The magnitude is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998).