TITLE: GCN CIRCULAR NUMBER: 12306 SUBJECT: GRB 110820A, the review of the sky area in plate archives DATE: 11/08/26 16:36:37 GMT FROM: Valentyna Golovnya at Main Astro Obs,Kyiv V.V. Golovnya (Main Astro Obs, Kyiv) report: We have undertaken the review of the sky area in vicinity of GRB 110820A (Beardmore GCN Circ.12091) on astronegatives, collected in Ukrainian NAS Main astronomical observatory plate archive (1976-1996). All the plates with the possible object appearance are digitized using Microtek ScanMaker 9800XL TMA and Epson Expression 10000XL flatbed scanners and have been placed into Golosiiv Plate Archive database DBGPA with open access to them. The list of plates is given in the table: YYYYMMDD TimeUT --Plates-- Exp. LimMag Star USNOA2 19830903.220221 GUA040C000207 16.0 15.75 1575-05316204 19841020.183916 GUA040C000521A 16.0 15.75 1575-05316204 Plates: the plate's identifier in GUA040C archive of DWA (D/F=400/2000, M=103"/mm) of the Ukrainian NAS Main Astro obs in Kyiv (Marsden's number - 83)[1]. Exp. - Duration of the maximum exposure (minutes). LimMag - Limited V mag, derived in the 15 minutes area around the location given in Beardmore et al. GCN Circ.12091: RA(J2000): 22h 52m 46.14s, Dec(J2000): +70d 17' 54.5" Star USNOA2 - Comparison star. The preview images of 2 areas together with the 15x15 min.of arc area from SkyMap can be found in http://gua.db.ukr-vo.org/img/grb/110820A/index.html The images with full resolution are available via e-mail on demand. References: 1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0), http://gua.db.ukr-vo.org