TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1082 SUBJECT: GRB 010222 - WHT BVRI images DATE: 01/07/11 09:02:10 GMT FROM: Isabel Salamanca at U. of Amsterdam Isabel Salamanca, Paul Vreeswijk, Evert Rol, Lex Kaper (Anton Pannekoek Institute, University of Amsterdam), Nial Tanvir (University of Hertfordshire), Andy Fruchter (STScI), Ralph Wijers (SUNY, Stony Brook), Chryssa Kouveliotou (NASA/MSFC), Thomas Augusteijn and Almudena Zurita (La Palma) report: On May 22, 2001, we have obtained B,V,R,I images of the field of GRB 010222 (Piro et al. GCN 959) with the Prime Focus Camera at the 4.2-m William Herschel Telescope (La Palma, Spain). The aim of these observations was to detect the host galaxy. The observations were done in photometric conditions, with seeing 1.1 arcsec. The details of the observation are as follows: Filter Exposure Star 'A' Limiting mag (sec) (Stanek, GCN 970) (3 sigma, aperture=1xFWHM) ----------------------------------------------------- B 900 18.38 25.4 V 675 17.62 25.8 R 675 17.13 24.4 I 675 16.76 24.3 Photometry was done by using 7 standard stars in the field SA110 of the Landolt Catalog (AJ, 1992, vol 104, pag 340). The resulting magnitudes of star 'A' are in excellent agreement (between 0.01 and 0.04 mag) with the values reported by Henden et al. (GCN 987). No host galaxy (or any other object) is detected at the position of the optical afterglow of GRB010222 (RA = 14:52:12.55, DEC =+43:01:06.2, J2000). Very close to the position of the GRB010222, we detect two objects, most probably galaxies. The very faint galaxies reported by Garnavich et al (GCN 1009) are not visible in our images, although there is a hint of one of them. The photometry and positions of these two galaxies are as follows: Galaxy 1 RA = 14:52:12.4, DEC = +43:00:58.7, J2000 1.6 arcsec W, 7.6 arcsec S ---------------------------------------------------- B = 23.51 +/- 0.10 V = 23.16 +/- 0.11 R = 22.47 +/- 0.08 I = 20.77 +/- 0.12 Galaxy 2: RA = 14:52:12.7, DEC = +43:01:09.9, J2000 1.6 arcsec E, 3.6 arcsec N ------------------------------------------------------ B = 24.45 +/- 0.24 V = 23.79 +/- 0.18 R = 23.05 +/- 0.15 I > 24.3 (affected by fringing) The error in the coordinates is about 0.24 arcsec. The error in the magnitudes is the formal error obtained with the task 'phot' of Iraf. A figure can be seen at http://zon.wins.uva.nl/~evert/grb010222/ This message can be cited.