TITLE: GCN GRB OBSERVATION REPORT NUMBER: 519 SUBJECT: Second RXTE Observation of GRB 000115 DATE: 00/01/16 19:55:56 GMT FROM: Frank Marshall at GSFC F. E. Marshall (GSFC), T. Takeshima (USRA/GSFC), T. Giblin & R.M. Kippen (UAH/MSFC) report: RXTE observed GRB 000115 (BATSE Trigger 7954) for a second time on 16 Jan. 2000 from 03:23 to 03:37 UT. Preliminary analysis shows no significant detection of the X-ray afterglow indicating that it is decaying at least as rapidly as t**-1. The best-fit RXTE position (J2000) remains that determined from the first observation (RA = 120.8, Decl. = -17.1). The 90 per cent confidence error box is approximately 0.3 degrees wide in RA and 0.4 degrees wide in Decl. Substantial variability on the time scale of an hour could cause an additional systematic uncertainty in Decl. This message may be cited.