X-ray transient search using XRISM/Xtend

Yohko Tsuboi; Koichiro Akasu; Noboru Nemoto; Tomokage Yoneyama; Marina Yoshimoto; Kotaro Fukushima; Katsuhiro Hayashi; Yoshiaki Kanemaru; Shoji Ogawa; Tessei Yoshida; Marc Audard; Ehud Behar; Shun Inoue; Yuiko Ishihara; Takayoshi Komura; Yoshitomo Maeda; Misaki Mizumoto; Masayoshi Nobukawa; Katja Pottschmidt; Megumi Shidatsu; Yukikatsu Terada; Yuichi Terashima; Hiroyuki Uchida

doi:10.1117/12.3019733

21 August 2024 X-ray transient search using XRISM/Xtend

Yohko Tsuboi, Koichiro Akasu, Noboru Nemoto, Tomokage Yoneyama, Marina Yoshimoto, Kotaro Fukushima, Katsuhiro Hayashi, Yoshiaki Kanemaru, Shoji Ogawa, Tessei Yoshida, Marc Audard, Ehud Behar, Shun Inoue, Yuiko Ishihara, Takayoshi Komura, Yoshitomo Maeda, Misaki Mizumoto, Masayoshi Nobukawa, Katja Pottschmidt, Megumi Shidatsu, Yukikatsu Terada, Yuichi Terashima, Hiroyuki Uchida

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309366 (2024) https://doi.org/10.1117/12.3019733
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The X-ray Imaging Spectroscopy Mission (XRISM) was launched on 2023-09-06 (UT). The onboard Xtend camera is now performing spectral imaging in the 0.4–13 keV band. Utilizing the wide field of view of Xtend of 38′ ×38′, we have been conducting searches for transient sources once a day, under the name of “XRISM/Xtend Transient Search (XTS)”. We report an Astronomer’s Telegram (ATel) within ∼1 day after downlinking the data from the satellite. Since the beginning of March 2024, when the XTS began full-scale operations, through early July, we issued nine ATel reports. The sensitivity limit of XTS is about 10⁻¹⁴ erg s⁻¹cm⁻² for a one-day observation, i.e. for an exposure time of ∼40 ks with the typical XRISM observing efficiency of about 50%. This sensitivity limit is orders of magnitude fainter than those obtained with all-sky survey missions such as MAXI and Einstein probe. It is comparable to those of Swift/XRT and eROSITA/SRG. XRISM observations are 4 days long on average, allowing for searches of sources that vary on time scales of more than one day, and down to the 10⁻¹⁴ erg s⁻¹cm⁻² flux range. Consequently, XRISM now plays a key role in time-domain astronomy.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yohko Tsuboi, Koichiro Akasu, Noboru Nemoto, Tomokage Yoneyama, Marina Yoshimoto, Kotaro Fukushima, Katsuhiro Hayashi, Yoshiaki Kanemaru, Shoji Ogawa, Tessei Yoshida, Marc Audard, Ehud Behar, Shun Inoue, Yuiko Ishihara, Takayoshi Komura, Yoshitomo Maeda, Misaki Mizumoto, Masayoshi Nobukawa, Katja Pottschmidt, Megumi Shidatsu, Yukikatsu Terada, Yuichi Terashima, and Hiroyuki Uchida "X-ray transient search using XRISM/Xtend", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309366 (21 August 2024); https://doi.org/10.1117/12.3019733

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