GCN Circular 8420
D. A. Kann, S. Schulze, C. Hoegner, S. Klose (TLS Tautenburg) and J. Greiner (MPE Garching) report: We observed the BAT Slew GRB 081025 (A. Copete et al., GCN 8409) with the TLS Tautenburg 1.34m Schmidt telescope. Observations were initialized in RRM mode (S. Klose et al., GCN 3609) as the BAT_SLEW_POSITION had been received at dusk. After obtaining 2 x 120 sec Ic-band images, we realized the large time delay and switched to deeper imaging. We further obtained 2 x 600 sec Ic-band images and one 600 sec Rc-band image. At the position of the X-ray afterglow candidate (J. Mao et al., GCN 8411), we do not detect any source. We find the following upper limits in comparison with the USNOB1.0 star at (catalog position, J2000) R.A. = 16:21:28.125, Dec. = +60:28:42.35, which has R2 = 18.61, I = 17.84: dt exp Filter upper limit (2 sigma) 0.38672 2x120+2x600 Ic 21.5 0.40047 1x600 Rc 22.5 These limits are in agreement with the g-band limit of Khamitov et al. (GCN 8418). We point out the existence of the galaxy cluster NSC 2162144+602602 at z=0.3903 (accoriding to SIMBAD) to the southeast of the afterglow position. The nearest galaxy (about 100" distant) seems to be a massive elliptical, possible a cD galaxy. No further observations are planned. This message may be cited.