GCN Circular 229
L.A. Antonelli, A. Di Paola, Osservatorio Astronomico di Roma, G. Gandolfi (BeppoSAX Scientific Operation Center) report on behalf of SWIRT Team and BeppoSAX Team: "On 25.16 (UT) January 1999, we imaged the Optical Transient field in the K band using the 1.1m AZT-24 telescope and the near-infrared camera/spectrometer SWIRCAM at the Campo Imperatore Astronomical Observatory (http://www.mporzio.astro.it/cimperatore/WWW/) operated by the Astronomical Observatory of Rome (O.A.R.). The 4'X4' field of view was exposed for 3300 s reaching the limiting magnitude in the K band of 17.9 +/- 0.2 mag. No source has been found within the errorbox of the O.T. (IAUC 7094). This observation provides a more compelling upper limit in K band with respect to the previous observation in the same band (GCN #214). The behaviour of the source between the two observation, at this wavelenght, is unknown. Further near infrared observations are in progress. This message may be cited."