Two Early Gamma-ray Bursts Optical Afterglow Detections with TAOS Telescopes — GRB 071010B and GRB 071112C

摘要

We present on two early detections of GRB afterglows with the Taiwanese-American Occltation Sruvey (TAOS)telescopes. The robotic TAOS system has been devised so that the routine Kuiper Belt Object (KBO) survey is interrupted when a GRB alert is triggered. Our first detection, GRB 071010B was detected by TAOS 62 s after the burst and showed a weak early brightening during the observations. No significant correction with the prompt gamma-ray emission indicated that our optical emission detected is afterglow emission. The second detection of TAOS, GRB 071112C was detected 96 s after the burst, also showed a possible initial raising then followed a steep decay in the R—band light curve.