We searched for X-ray candidates of the gravitational wave (GW) event GW150914 with Monitor of All-sky X-ray Image (MAXI). MAXI observed the error region of the GW event GW150914 from 4 minutes after the event and covered about 90% of the error region in 25 minutes. No significant time variations on timescales of 1 s to 4 days were found in the GW error region. The 3σ upper limits for the X-ray emission associated with the GW event in 2--20 keV were 9.5 ×10−10, 2.3 ×10−10, and 0.8 ×10−10 ergs cm−2 s−1 for the time scale of ∼ 1000 s, 1 day, and 10 days, respectively. If GW events are associated with short GRBs like GRB 050709, MAXI will be able to detect X-ray emissions from the source.
@article{arxiv.1708.01342,
title = {X-ray upper limits of GW150914 with MAXI},
author = {Nobuyuki Kawai and Hitoshi Negoro and Motoko Serino and Tatehiro Mihara and Kazuki Tanaka and Takahiro Masumitsu and Satoshi Nakahira},
journal= {arXiv preprint arXiv:1708.01342},
year = {2017}
}