https://www.astronomerstelegram.org Neutron Star, from The Astronomer's Telegram en-us 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 https://www.astronomerstelegram.org/?read=17772 H. Negoro, M. Nakajima, H. Aoe, K. Saito, T. Yokoyama, M. Wada, T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, Y. Ishihara, H. Ogaki, M. Shidatsu, C. Kang, 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, and S. Ogawa H. Negoro, M. Nakajima, H. Aoe, K. Saito, T. Yokoyama, M. Wada, T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, Y. Ishihara, H. Ogaki, M. Shidatsu, C. Kang, 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, and S. Ogawa negoro.hitoshi@nihon-u.ac.jp Credentialed by: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp) The Astronomer's Telegram ATel17772 The MAXI/GSC nova alert system triggered on a bright X-ray transient source at 08:47:31 UT on April 30, 2026. Assuming that the source flux was constant over the transit, we obtain the source position using the GSC_2 counter at (R.A., Dec) = (129.480 deg, -43.152 deg) = (08 37 55, -43 09 07) (J2000) with a statistical 90% C.L. ... 2026-05-01T15:12:22-00:00 https://www.astronomerstelegram.org/?read=17770 F. Cangemi, A. Coleiro, M. Dennefeld, O. Godet, D. Götz, S. Guillot, S. Le Stum, H.-L. Li, S. Schanne, L. Tao, L.-P. Xin, L. Zhang F. Cangemi, A. Coleiro, M. Dennefeld, O. Godet, D. Götz, S. Guillot, S. Le Stum, H.-L. Li, S. Schanne, L. Tao, L.-P. Xin, L. Zhang cangemi@apc.in2p3.fr Credentialed by: Floriane Cangemi (cangemi@apc.in2p3.fr) The Astronomer's Telegram ATel17770 On Monday, April 27, 2026, at 13:58:46.114 UT, the onboard trigger software of the SVOM/ECLAIRs telescope detected and localized a source at R.A. = 284.818 deg and Dec. ... 2026-04-30T09:35:08-00:00 https://www.astronomerstelegram.org/?read=17760 M. Brunet, F. Cangemi, S. Guillot, A. Coleiro, L. Zhang M. Brunet, F. Cangemi, S. Guillot, A. Coleiro, L. Zhang marius.brunet@irap.omp.eu Credentialed by: Floriane Cangemi (cangemi@apc.in2p3.fr) The Astronomer's Telegram ATel17760 On Tuesday, April 19th 2026, at 01:02:07.9 UTC (T0), the SVOM/ECLAIRs (4-150 keV) coded-mask telescope detected a Type I burst via an offline search with the event-by-event data downloaded through the X-band ground station. ... 2026-04-21T13:16:55-00:00