| 著者 |
Tsuboi, Yohko
Yoneyama, Tomokage
Yoshimoto, Marina
Akasu, Koichiro
Ishihara, Yukiko
Nagashima, Nagisa
Nemoto, Noboru
Sugai, Haruka
Yanagi, Tomohiro
Fukushima, Kotaro
| en |
Fukushima, Kotaro（Personal）
JAXA Institute of Space and Astronautical Science
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Hayashi, Katsuhiro
| en |
Hayashi, Katsuhiro（Personal）
JAXA Institute of Space and Astronautical Science
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Kanemaru, Yoshiaki
| en |
Kanemaru, Yoshiaki（Personal）
JAXA Institute of Space and Astronautical Science
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Ogawa, Shoji
| en |
Ogawa, Shoji（Personal）
JAXA Institute of Space and Astronautical Science
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Yoshida, Tessei
| en |
Yoshida, Tessei（Personal）
JAXA Institute of Space and Astronautical Science
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Audard, Marc
Behar, Ehud
Inoue, Shun
Kohmura, Takayoshi
Maeda, Yoshitomo
| en |
Maeda, Yoshitomo（Personal）
JAXA Institute of Space and Astronautical Science
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Mizumoto, Misaki
| en |
Mizumoto, Misaki（Personal）
University of Teacher Education Fukuoka
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Nobukawa, Masayoshi
Pottschmidt, Katja
| en |
Pottschmidt, Katja（Personal）
University of Maryland Baltimore County
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Shidatsu, Megumi
Terada, Yukikatsu
Terashima, Yuichi
Uchida, Hiroyuki
Kang, Chulsoo
Kiyomoto, Takuto
Kurashima, Jun
Matsushima, Tsukasa
森, 浩二
Motogami, Yugo
Narita, Takuto
Noda, Hirofumi
Sakamoto, Yuya
Takahashi, Hiromitsu
Takemoto, Reo
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内容記述 |
We present the first results from the X-ray Transient Search (XTS) system using the Xtend instrument (38.5′×38.5′ field of view) onboard the X-ray Imaging and Spectroscopy Mission. XTS enables automatic detection and characterization of variable and transient X-ray sources using data from the large-format imaging CCD camera Xtend. It operates as a semi-automated pipeline that processes quick-look data within hours of downlink, identifies candidate transients, and reports confirmed events through The Astronomer’s Telegram. During the performance verification phase, XTS successfully detected and publicly reported 17 transient events, including eleven stellar flares, one outburst from a high-mass X-ray binary, and one supernova. Xtend’s field of view of 38.5′×38.5′ and its continuous multiday observations provide a unique capability for monitoring variability over hour-to-day timescales with a 1-day point-source sensitivity of ∼10−14ergcm<sup>−2</sup>s<sup>−1</sup>. This 1-day sensitivity is well below that of all-sky monitors (∼10<sup>−9</sup>erg cm<sup>−2</sup>s<sup>−1</sup>) and is below that of scanning surveys such as SRG/eROSITA and Einstein Probe/WXT (∼10<sup>−13</sup>erg cm<sup>−2</sup>s<sup>−1</sup>). Although Xtend lacks the wide instantaneous coverage and rapid cadence of these surveys, its uninterrupted observations enable the complete tracking of longer-duration phenomena, such as stellar flares or X-ray binary outbursts, over a period of 1 to 4 days. XTS thus provides a new observational regime in time-domain X-ray astronomy: combining high sensitivity, uninterrupted day-scale coverage, and near real-time alert capability within a pointed mission. It complements both high-cadence all-sky monitors and deep pointed observatories by enabling detailed monitoring of intermediate-brightness phenomena over medium timescales. With future improvements in automation and coordination, XTS will serve as a key link between X-ray transient discovery and follow-up spectroscopy, contributing to the growing field of ti |
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