TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1365 SUBJECT: GRB 020409: No Evidence for an Optical Afterglow DATE: 02/04/12 21:36:27 GMT FROM: Stephen Holland at U. of Notre Dame S. T. Holland, P. M. Garnavich (Notre Dame), J. A. Munoz (IAC), K. Z. Stanek (Harvard-Smithsonian CfA), K. Augustesen, B. L. Jensen, J. Hjorth (Copenhagen), J. Gorosabel (IAA, Granada), and M. Giavalisco (STScI) report: We have obtained additional R-band images of the error box of GRB 020409 (Piro 2002, GCN 1347) using the 4Shooter on the 1.2-meter telescope at the Fred Lawrence Whipple Observatory (FLWO). The first images were taken on 2002 April 11 at 03:50 UT and had a total exposure time of 1020 seconds. The second set of images was taken on April 12 at 03:55 and had a total exposure time of 1200 seconds. These data were combined to form two deep images of the field which were subtracted from each other using the methods described in Schmidt et al. (1998, ApJ, 507, 46). We find no evidence for variability greater than 0.1 mag in 24 hours in any object in the BeppoSAX error box down to a limiting magnitude of approximately R = 21.5. To obtain a longer time baseline (31.5 hours) we compared the FLWO images to the combined exposures taken on April 11 at the Brorfelde Observatory (Holland et al. 2002, GCN 1359). Again, we found no evidence for an optical afterglow. Images are available at . This message may be cited.