TITLE: GCN GRB OBSERVATION REPORT NUMBER: 729 SUBJECT: GRB 000620: J-band observations DATE: 00/06/23 13:00:40 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma A. Di Paola, L.A. Antonelli, R. Speziali, Osservatorio Astronomico di Roma, Italy, A. Arkarov, V. Larionov, Pulkovo Astronomical Observatory, Russia, M. Dolci, Osservatorio Astronomico di Teramo, on behalf of a larger collaboration report: On June 20.86 U.T. and on June 21.83 U.T. we imaged the BeppoSAX error-box of GRB000620 (GCN #718) using the AZT-24 1.1-meter telescope at Campo Imperatore (AQ). We obtained two mosaics of J-band images for a total exposure time of 1500 s in each mosaic. The limiting mag reached in the 2'.6x2'.6 central part of both mosaics is J=20.5 mag down to J=19.5 mag on the border and seeing has been around 2.5 arcsec during both observations. A comparison of the two observations does not reveal any new or variable object within the BeppoSAX+IPN error box (GCNs #718, #723). This message is citable.