GCN Circular 1007
GeV/TeV Observations of GRB 010222 N. Goetting (1) and D. Horns (2) on behalf of the HEGRA Collaboration report: (1) University of Hamburg (Germany) (2) Max-Planck-Institut f. Kernphysik, Heidelberg (Germany) On February 23rd beginning at UT 02:37 the BeppoSAX position of GRB 010222 (GCN 960) was observed by the stereoscopic HEGRA Cherenkov telescope system on La Palma (approx. 19 hours after the outburst). The object was observed for 4 hours at altitudes > 45 degrees under good weather conditions. The source was not detected above a threshold photon energy of 760 GeV. A preliminary data analysis gives an upper limit on the photon flux at the 90% confidence level: J(E > 760 GeV) < 9.4 * 10^(-12) erg cm^(-2) s^(-1) Contemporaneous observations of the Crab nebula were used to derive this upper limit.