https://www.astronomerstelegram.org Pulsar, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=17837 L. Qian, Y. C. Zhang, M. Zhu, P. Jiang, G. Y. Zhang, L. Y. Wang, X. Y. Zhang, R. P. Eatough, Z. Pan L. Qian, Y. C. Zhang, M. Zhu, P. Jiang, G. Y. Zhang, L. Y. Wang, X. Y. Zhang, R. P. Eatough, Z. Pan lqian@nao.cas.cn Credentialed by: Lei Qian (lqian@nao.cas.cn) The Astronomer's Telegram ATel17837 We performed a systematic search of single pulses by a TransientX-based pipeline with a dispersion measure range of 10 cm^-3 pc to 5000 cm^-3 pc in the POP (Piggyback Observation of Pulsars, https://fast.bao.ac.cn/cms/article/2034282224688386050) survey, with a S/N threshold of 8.0. ... 2026-06-07T15:46:51-00:00 https://www.astronomerstelegram.org/?read=17816 M. Nakajima, T. Mihara, H. Negoro, K. Saito, T. Yokoyama, M. Wada, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara, M. Shidatsu, C. Kang, T. Nakamoto, M. Uenishi, T. Usuki, S. Yatsuzuka, I. Takahashi, Y. Yatsu, S. Nakahira, S. Ueno, H. Tomida, M. Kurihara, Y. Ueda, K. Fujiwara, S. Kobayashi, M. Yamauchi, M. Nishio, C. Hiraizumi, K. Yamaoka, M. Sugizaki, W. Iwakiri, T. Kawamuro, S. Yamada, S. Ogawa M. Nakajima, T. Mihara, H. Negoro, K. Saito, T. Yokoyama, M. Wada, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara, M. Shidatsu, C. Kang, T. Nakamoto, M. Uenishi, T. Usuki, S. Yatsuzuka, I. Takahashi, Y. Yatsu, S. Nakahira, S. Ueno, H. Tomida, M. Kurihara, Y. Ueda, K. Fujiwara, S. Kobayashi, M. Yamauchi, M. Nishio, C. Hiraizumi, K. Yamaoka, M. Sugizaki, W. Iwakiri, T. Kawamuro, S. Yamada, S. Ogawa nakajima.motoki@nihon-u.ac.jp Credentialed by: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp) The Astronomer's Telegram ATel17816 The MAXI/GSC nova alert system triggered on a weak X-ray brightening from the Be/X-ray binary pulsar LS V +44 17 (RX J0440.9+4431) on 2026 May 22 (MJD 61182). ... 2026-05-27T02:00:01-00:00 https://www.astronomerstelegram.org/?read=17815 M. Nakajima, T. Mihara, M. Sugizaki, H. Negoro, K. Saito, T. Yokoyama, M. Wada, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara, M. Shidatsu, C. Kang, T. Nakamoto, M. Uenishi, T. Usuki, S. Yatsuzuka, I. Takahashi, Y. Yatsu, S. Nakahira, S. Ueno, H. Tomida, M. Kurihara, Y. Ueda, K. Fujiwara, S. Kobayashi, M. Yamauchi, M. Nishio, C. Hiraizumi, K. Yamaoka, W. Iwakiri, T. Kawamuro, S. Yamada, S. Ogawa M. Nakajima, T. Mihara, M. Sugizaki, H. Negoro, K. Saito, T. Yokoyama, M. Wada, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara, M. Shidatsu, C. Kang, T. Nakamoto, M. Uenishi, T. Usuki, S. Yatsuzuka, I. Takahashi, Y. Yatsu, S. Nakahira, S. Ueno, H. Tomida, M. Kurihara, Y. Ueda, K. Fujiwara, S. Kobayashi, M. Yamauchi, M. Nishio, C. Hiraizumi, K. Yamaoka, W. Iwakiri, T. Kawamuro, S. Yamada, S. Ogawa nakajima.motoki@nihon-u.ac.jp Credentialed by: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp) The Astronomer's Telegram ATel17815 The MAXI/GSC nova alert system triggered on an X-ray brightening from the Be/X-ray binary pulsar 1A 0535-66 (also known as 1A 0538-66) on 2026 May 21 (MJD 61181; see the MAXI alert page at https://maxi.riken.jp/alert/novae/1181387701/1181387701.htm ). ... 2026-05-26T14:00:05-00:00 https://www.astronomerstelegram.org/?read=17809 T. Takagi, M. Shidatsu, T. Mihara, M. Nakajima, M. Sugizaki T. Takagi, M. Shidatsu, T. Mihara, M. Nakajima, M. Sugizaki takagi.toshihiro.bb@ehime-u.ac.jp Credentialed by: Megumi Shidatsu (shidatsu.megumi.wr@ehime-u.ac.jp) The Astronomer's Telegram ATel17809 The X-ray binary pulsar GX 1+4 has been in a long-term spin-down phase, characterized by a gradual decrease in pulse frequency, from the 1980s until recently. ... 2026-05-22T17:48:41-00:00 https://www.astronomerstelegram.org/?read=17756 Jianli Zhang, Hui Zhu, Guanhong Lin, DeJia Zhou, Songzhan Chen, Wen-Jun Huang, Zi-Wei Ou, P. H. Thomas Tam, Sha Wu, Qiang Yuan, Yi Zhang Jianli Zhang, Hui Zhu, Guanhong Lin, DeJia Zhou, Songzhan Chen, Wen-Jun Huang, Zi-Wei Ou, P. H. Thomas Tam, Sha Wu, Qiang Yuan, Yi Zhang jlzhang@bao.ac.cn Credentialed by: Jianli Zhang (jlzhang@bao.ac.cn) The Astronomer's Telegram ATel17756 We report the detection of radio pulsations from the radio-quiet gamma-ray pulsar PSR J2238+5903 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST; [1]). ... 2026-04-17T04:13:40-00:00 https://www.astronomerstelegram.org/?read=17747 M. Yoshimoto, T. Yoneyama, Y. Kanemaru, Y. Omiya, Y. Uchida, M. Audard, E. Behar, K. Fukushima, T. Hakamata, S. Inoue, Y. Ishihara, C. Kang, T. Kiyomoto, T. Kohmura, H. Kuramoto, J. Kurashima, Y. Maeda, H. Matsumoto, A. Miyamoto, M. Mizumoto, K. Mori, Y. Motogami, T. Narita, M. Nobukawa, H. Noda, S. Ogawa, Y. Sakamoto, M. Shidatsu, H. Takahashi, T. Takagi, S. Takatsuka, F. Takisawa, Y. Terada, Y. Terashima, Y. Tsuboi, H. Uchida, A. Yoshimoto M. Yoshimoto, T. Yoneyama, Y. Kanemaru, Y. Omiya, Y. Uchida, M. Audard, E. Behar, K. Fukushima, T. Hakamata, S. Inoue, Y. Ishihara, C. Kang, T. Kiyomoto, T. Kohmura, H. Kuramoto, J. Kurashima, Y. Maeda, H. Matsumoto, A. Miyamoto, M. Mizumoto, K. Mori, Y. Motogami, T. Narita, M. Nobukawa, H. Noda, S. Ogawa, Y. Sakamoto, M. Shidatsu, H. Takahashi, T. Takagi, S. Takatsuka, F. Takisawa, Y. Terada, Y. Terashima, Y. Tsuboi, H. Uchida, A. Yoshimoto yoneyama.tomokage@jaxa.jp Credentialed by: Tomokage Yoneyama (tyoneyama263@g.chuo-u.ac.jp) The Astronomer's Telegram ATel17747 XRISM/Xtend Transient Search (XTS) detected an X-ray flare flare or outburst from an X-ray source XRISM J0101-7207 on 2026-04-09 TT. The source position is determined to be (R.A., Dec.) = (15.255, -72.114), with a systematic error of & sim; 40 arcsec. ... 2026-04-10T07:25:06-00:00