GCN Circular 7644
A. de Ugarte Postigo (ESO), D. A. Kann (TLS Tautenburg), A.J. Castro-Tirado (IAA-CSIC, Granada), A. Aguirre (CAHA), C. Jordi (U. Barcelona) report on behalf of a larger collaboration: We have observed the XRT error circle (Beardmore et al. GCN 7641) of the possible intermediate GRB 080426 (H. Ziaeepour et al. GCN 7639, J. Cummings et al. GNC 7640) with the 2.2m telescope at Calar Alto Observatory (Almer�a, Spain) at high airmass but good conditions. The observations started at 26 April 19:53:33 UT and were carried out in B, V, R and I bands. In an I-band combined frame comprised of 11x300s with mean epoch 7.50 hours after the burst, we do not detect any source within the XRT error box down to a limiting magnitude of I~22.5. Further analysis is ongoing. This message may be cited.