TITLE: GCN GRB OBSERVATION REPORT NUMBER: 803 SUBJECT: Optical candidate for GRB000926 DATE: 00/09/28 00:40:30 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel (DSRI, Copenhagen), J.M. Castro Ceron (ROA, San Fernando), A.J. Castro-Tirado (IAA-CSIC, Granada), J. Greiner (AIP, Potsdam), C. Wolf (MPIA, Heidelberg), N. Lund (DSRI, Copenhagen) report on behalf of a larger European collaboration: Starting at 27.859UT SEP 2000 we obtained R- ,V-, I- and B-band images of the IPN error box for GRB 000926 (Hurley et al., GCN #801) with the 2.2m. telescope at the Calar Alto Observatory. A comparison with the Digital Sky Survey-2 revealed a new bright point-like source located at: RA(J2000)= 17h 04m 09.70s DEC(J2000)= +51o 47' 10.2" Our uncertainty is 2". These object's coordinates agree with the ones reported independently by Dall et al. It is clearly detected in the R-, V-, and I-bands. We derive a preliminary magnitude of 19.5 +/- 0.3 based on a zero point calculated with USNO-2.0 stars in the field. Further multicolour imaging is in progress. This message may be cited. [GCN OPS NOTE 28Sep00: The last two authors were added to the list at the first author's request.]