TITLE: GCN CIRCULAR NUMBER: 44563 SUBJECT: GRB 260509A: SAO RAS optical observations DATE: 26/05/11 18:46:55 GMT FROM: Alexander Moskvitin at SAO RAS <mosk@sao.ru> A. Moskvitin and O. Spiridonova (SAO RAS), report on behalf of the GRB follow-up team. We observed the field of the GRB 260509A (Götz et al., GCN 44504) with the Zeiss-1000, 1m telescope of the SAO RAS equipped with the CCD photometer. We obtained 12 * 300 sec. images in Rc band on May 10, 18:18:31--19:49:52 UT (21.22 hr after the trigger). The OT (O'Neill et al., GCN 44505; Saccardi et al., GCN 44506; Wu et al., GCN 44507; Sánchez Álvarez et al., GCN 44509; Zheng et al., GCN 44510; Kechin et al., GCN 44512; Belkin, GCN 44513; Corcoran et al., GCN 44514; Bochenek and Perley, GCN 44516) is marginally detected with the brightness of R = 24.0 +/- 0.3. This preliminary photometry is based on nearby stars from the USNO-B1 catalogue (R2 magnitudes) and is not corrected for the Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44563. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...