TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1091 SUBJECT: GRB000926, Host Galaxy Observations DATE: 01/09/08 07:45:25 GMT FROM: Vladimir Sokolov at SAO RAS S. Dodonov, T. Fatkhullin, V. Sokolov (SAO RAS), Andrew Fruchter (STScI), V. Komarova, A. Moiseev (SAO RAS), A. Cherepashchuk, K. Postnov (SAI-MSU Moscow) report: "On July 24 and 25, 2001 UT, we have observed the field of the optical transient of GRB 000926 (Fynbo et al., 2001, A&A, 373, 796). We have obtained B, V, Rc, Ic images with the SCORPIO (http://www.sao.ru/~moisav/scorpio/scorpio.html) at the 6-m telescope of SAO RAS. Photometric conditions were good and the seeing was about 1.3 arcsec. Photometric calibration was performed using Stetson standards in Landolt standard field PG1633. At the position of the optical transient we have detected an object - a host galaxy. At about 3" to the East from the OT position an extended emission is clearly seen. This extended emission is most likely the galaxy seen in early HST image (see Price et al., 2001, ApJ, 549, L7) and its association with the host is unclear. The exposure times and magnitudes of the object are: Filter Exposure (sec.) Magnitude Aperture --------------------------------------------------------- B 2500 26.13 +/- 0.17 2.0 arcsec V 1500 25.85 +/- 0.22 2.0 arcsec Rc 1260 26.31+/- 0.25 2.0 arcsec Ic 1800 24.7 +/- 0.4 2.0 arcsec --------------------------------------------------------- The faint R-band magnitude can be explained by a graphite band as on the Galactic extinction curves. Indeed, for the redshift z=2.0369 (Castro et al., GCN #851) this band (2200A) goes to the observed R-band. If so, then this is the second case of direct observations of this feature (see Sokolov et al., 2001, A&A, 372, 438, the case of the HG GRB 980703). We also performed the photometry of entire system of the objects using an aperture of 4.5 arcsec. Below we present the obtained magnitudes: Filter Exposure (sec.) Magnitude Aperture --------------------------------------------------------- B 2500 24.73 +/- 0.11 4.5 arcsec V 1500 24.81 +/- 0.19 4.5 arcsec Rc 1800* 24.38+/- 0.10 4.5 arcsec Ic 1800 23.68 +/- 0.30 4.5 arcsec --------------------------------------------------------- * The R-band data obtained on 25 Aug. are coadded. Images can be seen at http://www.sao.ru/~sokolov/GRB/HOSTS/GRB000926/GRB000926.html This message may be cited". -Vladimir Sokolov, on behalf of the RAS Special Astrophysical Observatory GRB followup team.