GCN Circular 343
J. P. Halpern (Columbia U.), J. Parker (SwRI), L. Allen (U. Michigan), and E. Costa (IAS/CNR, Rome) report on behalf of the MDM Observatory GRB follow-up team: "We imaged the field of the BeppoSAX fast X-ray transient 1SAX J0835.9+5118 (Piro GCN 333; Gandolfi et al., IAUC 7174) in the R band on two consecutive nights using the MDM 2.4m telescope. Total exposure time was 50 minutes on May 21.19 UT and 40 minutes on May 22.19 UT. Seeing was 1.5-1.6 arcsec on the first night, and 1.8-2.2 arcsec on the second night. Limiting magnitudes for 5 sigma detection are R = 23.5 on the first night and R = 22.1 on the second night. No variable object is found to the limit of R = 22.1 within the 3' radius error circle. Below we list magnitudes of objects referred to in previous circulars: the radio source of Frail et al. (GCN 337), and the galaxy described by Pedersen et al. (GCN 340). We adopt here the photometric calibration of Henden et al. (GCN 339). Radio Source B = 21.58 +/- 0.08 (May 21.15 1.3m) R = 20.81 +/- 0.05 (May 21.19 2.4m) R = 20.69 +/- 0.07 (May 22.19 2.4m) Pedersen Galaxy B = 20.62 +/- 0.09 (May 21.15 1.3m) R = 19.63 +/- 0.03 (May 21.19 2.4m) R = 19.62 +/- 0.09 (May 22.19 2.4m) The B magnitude of the radio source differs from the value given in our GCN 338 in part because of a 0.5 magnitude difference between the USNO-A2.0 values and the new calibration of Henden et al. (GCN 339). However, the magnitude of the radio source given as R = 21.21 +/- 0.06 by Luginbuhl et al. (GCN 341) might indicate a significant discrepancy, assuming that the same calibration is being used. With regard to the morphology of the Pedersen et al. galaxy, although our images have inferior seeing, the object in question appears consistent in both magnitude and shape on our May 21 image, including a faint extension in the same place as their point-like source. This message may be cited."