TITLE: GCN GRB OBSERVATION REPORT NUMBER: 504 SUBJECT: GRB 991216: Updated BATSE parameters DATE: 99/12/20 16:52:41 GMT FROM: R. Marc Kippen at BATSE/UAH/MSFC R. M. Kippen (University of Alabama in Huntsville) reports on behalf of the BATSE GRB team the updated standard BATSE parameters for GRB 991216 (trigger 7906): Duration (seconds) T50: 6.2720 +/- 0.0905 T90: 15.1680 +/- 0.1109 Peak Flux (photons / cm^2-s, 50-300 keV) 64ms: 91.4654 +/- 1.053570 (3rd brightest in BATSE catalog) 256ms: 82.0787 +/- 0.498275 (3rd brightest in BATSE catalog) 1024ms: 67.5055 +/- 0.226543 (2nd brightest in BATSE catalog) Peak Flux (ergs / cm^2-s, 50-300 keV) 64ms: 1.99303e-05 +/- 2.39823e-07 256ms: 1.78031e-05 +/- 1.12832e-07 1024ms: 1.45472e-05 +/- 1.27662e-07 Fluence in 4 discriminator channels (ergs / cm^2) 1: 1.72637e-05 +/- 5.28282e-08 ( 20.6 - 64.7 keV) 2: 2.29693e-05 +/- 5.43826e-08 ( 64.7 - 118.1 keV) 3: 6.50656e-05 +/- 1.36158e-07 (118.1 - 345.5 keV) 4: 1.50204e-04 +/- 1.16799e-06 ( > 345.5 keV) Total fluence (ergs / cm^2, > 20.6 keV) 2.55503e-04 +/- 1.17834e-06 (13th largest fluence in BATSE catalog) High time resolution lightcurves of this burst are available at http://gammaray.msfc.nasa.gov/batse/grb/lightcurve/ -eof-