TITLE: GCN GRB OBSERVATION REPORT NUMBER: 522 SUBJECT: BATSE Observations of GRB000115 DATE: 00/01/19 16:50:01 GMT FROM: Timothy Giblin at MSFC T. Giblin and R. M. Kippen (UAH/MSFC) report on behalf of the BATSE GRB Team: On 2000 January 15.61773 UT, BATSE was triggered by the bright GRB000115 (Trigger# 7954). The time history of the burst is significantly variable with a series of well-defined pulses over a broad range of intensities. The pulse emission is followed by a soft (<300 keV) and weak emission tail with a decay time of approximately 20 seconds. The measured T50 and T90 durations are 4.5 (+/- 0.09) and 15.0 (+/- 0.14) seconds, respectively. The brightest peak of the burst and several weaker pulses show emission above 300 keV. The energy fluence hardness ratio (100-300 keV / 50-100 keV) is 3.18 (+/- 0.02), typical for long bursts. The 50-300 keV peak flux measured on the 64 ms timescale is 56.96 (+/- 0.81) photons/s/cm^2, placing it in the top 1% of the BATSE peak flux distribution. The fluence above 25 keV is 4.36 (+/- 0.07) x 10^-5 ergs/cm^2, placing it in the top 10% of the BATSE fluence distribution. The BATSE location is consistent with the x-ray afterglow detected by RXTE/PCA (GCN 519) and with the IPN annulus (GCN 520-521). The BATSE light curve and skymap are now available at: http://gammaray.msfc.nasa.gov/~kippen/batserbr/ -eof-