{"paper":{"title":"X-ray, Optical, and Near-infrared Monitoring of the New X-ray Transient MAXI J1820+070 in the Low/hard State","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Hidekazu Hanayama, Hiroshi Akitaya, Hiroyuki Maehara, Hitoshi Negoro, Jun Takahashi, Katsuhiro L. Murata, Kazuhiro Sekiguchi, Kumiko Morihana, Masaki Takayama, Masayuki Yamanaka, Megumi Shidatsu, Miho Kawabata, Nobuyuki Kawai, Noriyuki Katoh, Ryo Adachi, Ryosuke Itoh, Satoshi Nakahira, Satoshi Yamada, Seiko Takagi, Taiki Kawamuro, Takahiro Nagayama, Takashi Horiuchi, Tatsuya Nakaoka, Tomohito Ohshima, Tomoki Morokuma, Tomoki Saito, Yoichi Yatsu, Yoshihiro Ueda, Yutaro Tachibana","submitted_at":"2018-10-26T08:20:21Z","abstract_excerpt":"We report X-ray, optical, and near-infrared monitoring of the new X-ray transient MAXI J1820$+$070 discovered with MAXI on 2018 March 11. Its X-ray intensity reached $\\sim 2$ Crab in 2--20 keV at the end of March, and then gradually decreased until the middle of June. In this period, the X-ray spectrum was described by Comptonization of the disk emission, with a photon index of $\\sim$1.5 and an electron temperature of $\\sim$50 keV, which is consistent with a black hole X-ray binary in the low/hard state. The electron temperature and the photon index were slightly decreased and increased with i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.11222","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}