https://www.astronomerstelegram.org Transient, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=17840 Lara Sidoli Lara Sidoli sidoli@lambrate.inaf.it Credentialed by: Lara Sidoli (sidoli@lambrate.inaf.it) The Astronomer's Telegram ATel17840 A new X-ray transient has been recently discovered by the Einstein Probe (EP), EP260531a (ATel#17828). Its sky position has been refined with the Follow-up X-ray Telescope (FXT; ATel#17833). ... 2026-06-10T08:57:32-00:00 https://www.astronomerstelegram.org/?read=17833 G. L. Huang, Z. X. Li, J. Y. Cao, J. W. Hu, Y. Liu on behalf of the Einstein Probe team G. L. Huang, Z. X. Li, J. Y. Cao, J. W. Hu, Y. Liu on behalf of the Einstein Probe team ep_ta@bao.ac.cn Credentialed by: Yuan Liu (liuyuan@bao.ac.cn) The Astronomer's Telegram ATel17833 The Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission performed a follow-up observation of the X-ray transient EP260531a (ATel #17828) on 2026-06-04 07:33:43 (UTC), with a net exposure of 6 ks. ... 2026-06-05T08:37:41-00:00 https://www.astronomerstelegram.org/?read=17828 G. L. Huang, Z. X. Li, J. Y. Cao, J. W. Hu, Y. Liu on behalf of the Einstein Probe team G. L. Huang, Z. X. Li, J. Y. Cao, J. W. Hu, Y. Liu on behalf of the Einstein Probe team ep_ta@bao.ac.cn Credentialed by: Yuan Liu (liuyuan@bao.ac.cn) The Astronomer's Telegram ATel17828 We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission through ground data analysis, designated EP260531a. ... 2026-06-03T09:39:17-00:00 https://www.astronomerstelegram.org/?read=17826 K. Hornoch, H. Kucakova, A. W. Shafter K. Hornoch, H. Kucakova, A. W. Shafter k.hornoch@centrum.cz Credentialed by: Allen W. Shafter (ashafter@sdsu.edu) The Astronomer's Telegram ATel17826 We report the discovery of a probable nova found during our survey of the central region of M31. The object was discovered on a co-added 600-s R-band CCD frame taken on 2026 Jun. ... 2026-06-02T02:24:58-00:00 https://www.astronomerstelegram.org/?read=17825 W. F. Wen, C. Y. Dai, Q. Y. Wu, H. Sun W. F. Wen, C. Y. Dai, Q. Y. Wu, H. Sun ep_ta@bao.ac.cn Credentialed by: Yuan Liu (liuyuan@bao.ac.cn) The Astronomer's Telegram ATel17825 Following the detection of the X-ray transient EP260530a (Wu et al., ATel 17824), we performed a follow-up observation with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe mission. ... 2026-06-01T08:50:12-00:00 https://www.astronomerstelegram.org/?read=17824 Q. Y. Wu, C. Y. Dai, W. F. Wen, H. Sun on behalf of the Einstein Probe team Q. Y. Wu, C. Y. Dai, W. F. Wen, H. Sun on behalf of the Einstein Probe team ep_ta@bao.ac.cn Credentialed by: Yuan Liu (liuyuan@bao.ac.cn) The Astronomer's Telegram ATel17824 We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission during an observation on 2026-05-30T07:29:02 (UTC), designated EP260530a. ... 2026-05-31T09:18:56-00:00 https://www.astronomerstelegram.org/?read=17819 T. Narita, H. Uchida, Y. Kanemaru, A. Miyamoto, Y. Omiya, Y. Uchida, T. Yoneyama, M. Audard, E. Behar, K. Fukushima, T. Hakamata, S. Inoue, Y. Ishihara, C. Kang, T. Kiyomoto, T. Kohmura, H. Kuramoto, Y. Maeda, H. Matsumoto, A. Miyamoto, M. Mizumoto, Y. Motogami, M. Nobukawa, H. Noda, S. Ogawa, Y. Sakamoto, M. Shidatsu, H. Takahashi, T. Takagi, S. Takatsuka, F. Takisawa, Y. Terada, Y. Terashima, Y. Tsuboi, A. Yoshimoto, M. Yoshimoto, P. P. Plucinsky T. Narita, H. Uchida, Y. Kanemaru, A. Miyamoto, Y. Omiya, Y. Uchida, T. Yoneyama, M. Audard, E. Behar, K. Fukushima, T. Hakamata, S. Inoue, Y. Ishihara, C. Kang, T. Kiyomoto, T. Kohmura, H. Kuramoto, Y. Maeda, H. Matsumoto, A. Miyamoto, M. Mizumoto, Y. Motogami, M. Nobukawa, H. Noda, S. Ogawa, Y. Sakamoto, M. Shidatsu, H. Takahashi, T. Takagi, S. Takatsuka, F. Takisawa, Y. Terada, Y. Terashima, Y. Tsuboi, A. Yoshimoto, M. Yoshimoto, P. P. Plucinsky uchida@cr.scphys.kyoto-u.ac.jp Credentialed by: Hiroyuki Uchida (uchida@cr.scphys.kyoto-u.ac.jp) The Astronomer's Telegram ATel17819 XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J2325+5840 on 2026-5-26 TT. The source position is determined to be (R.A., Dec.) = (351.357, 58.660), with a systematic error of & sim; 40 arcsec. ... 2026-05-28T11:23:57-00:00 https://www.astronomerstelegram.org/?read=17818 Alessio Marino, Francesco Coti Zelati, Nanda Rea, Yilong Wang, Giulia Illiano, Minghao Zhang, Chen Wang, Biao Zhang, Jiapei Feng, Haiwu Pan Alessio Marino, Francesco Coti Zelati, Nanda Rea, Yilong Wang, Giulia Illiano, Minghao Zhang, Chen Wang, Biao Zhang, Jiapei Feng, Haiwu Pan marino@ice.csic.es Credentialed by: Alessio Marino (marino@ice.csic.es) The Astronomer's Telegram ATel17818 We report on the detection of a new outburst from the neutron star low-mass X-ray binary MXB 1730-335 (a.k.a. the Rapid Burster) with the Wide-field X-ray Telescope (WXT) onboard Einstein Probe (EP). ... 2026-05-27T15:18:27-00:00 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