Recent GRBs Observed with the 1.23 m CAHA Telescope and the Status of Its Upgrade
The picture shows the coadded -band image taken for GRB 090621B with the 1.23 m telescope of Calar Alto. The faintest of the two objects (the most upper one indicated with tick marks) represents the candidate reported in . Approximately towards the Southwest, it is marked the candidate reported by , brighter than the one of . The cyan circles show the USNO-A2 catalogue stars used for the astrometric and photometric calibrations. The field of view of the image is , with North up and East left.
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