Recent GRBs Observed with the 1.23 m CAHA Telescope and the Status of Its Upgrade
Coadded -band image of GRB 090628 taken with the 1.23 m telescope. The large circle represents the preliminary XRT error circle , whereas the small one shows the refined one  reported for GRB 090628. The field of view of the image is . The total exposure time is 3120 s. The individual images were taken in June 28.9486–29.0225 UT (1.43–3.20 hours after the gamma-ray event). No objects were found in both error circles down to . More detailed information can be found in .
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