GCN Circular 9162
Subject
GRB 090418A: ROTSE-III Refined Analysis
Date
2009-04-19T16:15:56Z (15 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
F. Yuan (U Mich) report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
090418A (Swift trigger 349510; Mangano et al, GCN 9149) 19.0 s after
the burst, during the gamma-ray emission, and detected the optical
counterpart (Yuan et al, GCN 9150). We took 10 5-sec, 10 20-sec and 26
60-sec useful exposures before sunrise. Further analysis of single
images revealed an initially rising lightcurve with two subsequent
peaks at ~40s (~15.6 mag) and ~130s (~15.4 mag) before the OT dropped
below our detection limit.