The error region of the the gravitational-wave (GW) event GW151226 was observed with Monitor of All-sky X-ray Image (MAXI). MAXI was operated at the time of GW151226, and continuously observed to 4 minutes after the event. MAXI covered about 84% of the 90 percent error region of the GW event during the first 92 minutes orbit after the event. No significant X-ray transient was detected in the GW error region. A typical 3-σ GSC upper limit for a scan is 1.2 ×10−9 ergs cm−2 s−1 in the 2-20 keV. The auto-detection (MAXI nova-search) systems detected a short excess event with a low significance (2.85σ) from 5257 s to 5260 s after the GW trigger. Finally, we discuss the sensitivity of MAXI to long X-ray emissions of short gamma-ray bursts, which are expected to accompany GW events.
Cite
@article{arxiv.1708.01352,
title = {X-ray upper limits of GW151226 with MAXI},
author = {Motoko Serino and Nobuyuki Kawai and Hitoshi Negoro and Tatehiro Mihara and Takahiro Masumitsu and Satoshi Nakahira},
journal= {arXiv preprint arXiv:1708.01352},
year = {2017}
}