TITLE: GCN CIRCULAR NUMBER: 7516 SUBJECT: GRB 080325: Early observations from OSN DATE: 08/03/25 18:33:39 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO, Chile), A. Sota, J.Gorosabel, A.J. Castro-Tirado (IAA-CSIC) report, We have observed the field of GRB 080325 (Vetere et al. GCN 7512) with the 1.5m OSN telescope at Sierra Nevada Observatory (Granada, Spain) starting at 04:23:01 UT, 12.48 minutes after the burst. Inside the initial XRT error box there is an object with coordinates R.A.: 18:31:34.13 Dec.: +36:31:19.8 (J2000 +/- 0.5"), which is also present in the DSS, consistent with the coordinates reported by Updike et al. (GCN 7515). Inside the refined XRT error box (Osborne et al. GCN 7513) we do not detect any new source down to the following 3-sigma limits (t-t0 being the mean observing time since the GRB): (t-t0) (min) | Exp. time (s) | I-band limit 12.65 | 20 | > 19.5 14.36 | 9x20 | > 20.8 39.46 | 2300s | > 21.8 This message may be cited