https://www.astronomerstelegram.org Black Hole, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=18034 Maxime Parra, Pierre-Olivier Petrucci, Stefano Bianchi, Floriane Cangemi, Alessio Marino, Poshak Gandhi, Megumi Shidatsu, et al. Maxime Parra, Pierre-Olivier Petrucci, Stefano Bianchi, Floriane Cangemi, Alessio Marino, Poshak Gandhi, Megumi Shidatsu, et al. maxime.parrastro@gmail.com Credentialed by: Maxime Parra (maxime.parra@univ-grenoble-alpes.fr) The Astronomer's Telegram ATel18034 We report on a follow-up NuSTAR exposure on the Transient Black Hole LMXB candidate 4U 1630-47, obtained as part of an XMM-NuSTAR large program, following the detection of the source by SVOM (Atel #18030). ... 2026-09-07T18:27:22-00:00 https://www.astronomerstelegram.org/?read=18030 F. Cangemi, S. Le Stum, A. Coleiro, O. Godet, J. Rodriguez, Y.-H. I. Yin, R.-C. Chen, L. Tao, L. Zhang F. Cangemi, S. Le Stum, A. Coleiro, O. Godet, J. Rodriguez, Y.-H. I. Yin, R.-C. Chen, L. Tao, L. Zhang cangemi@apc.in2p3.fr Credentialed by: Floriane Cangemi (cangemi@apc.in2p3.fr) The Astronomer's Telegram ATel18030 On 2026 September 2 at 01:59:31.116 UT, the onboard trigger software of the SVOM/ECLAIRs telescope (4-150 keV) detected and localized a source at R.A. = 248.506 deg and Dec. ... 2026-09-04T13:05:22-00:00 https://www.astronomerstelegram.org/?read=18026 B. Y. Chen, W. Z. Li, Q. C. Shui, Y. P. Chen, S. Zhang, S. N. Zhang, H. Feng, L. Tao, L. Zhang, S. M. Jia, X. B. Li, F. J. Lu, L. M. Song, S. J. Zheng, C. K. Li, Z. X. Li, G. L. Huang, Q. C. Zhao, on behalf of the Insight-HXMT team B. Y. Chen, W. Z. Li, Q. C. Shui, Y. P. Chen, S. Zhang, S. N. Zhang, H. Feng, L. Tao, L. Zhang, S. M. Jia, X. B. Li, F. J. Lu, L. M. Song, S. J. Zheng, C. K. Li, Z. X. Li, G. L. Huang, Q. C. Zhao, on behalf of the Insight-HXMT team bychen@ihep.ac.cn Credentialed by: Yu-Peng Chen (chenyp@ihep.ac.cn) The Astronomer's Telegram ATel18026 MAXI J1750-327 / EP260812c / EP J175003.0-324244 was discovered by MAXI/GSC and Einstein Probe (ATels #17963 and #17964) and was subsequently identified as a black-hole X-ray binary candidate based on its X-ray spectral and timing properties (ATels #17969 and #17974). ... 2026-09-01T13:41:04-00:00 https://www.astronomerstelegram.org/?read=18024 B. Y. Chen, W. Z. Li, Q. C. Shui, Y. P. Chen, S. Zhang, S. N. Zhang, H. Feng, L. Tao, L. Zhang, S. M. Jia, X. B. Li, F. J. Lu, L. M. Song, S. J. Zheng, C. K. Li, Z. X. Li, G. L. Huang, Q. C. Zhao, on behalf of the Insight-HXMT team B. Y. Chen, W. Z. Li, Q. C. Shui, Y. P. Chen, S. Zhang, S. N. Zhang, H. Feng, L. Tao, L. Zhang, S. M. Jia, X. B. Li, F. J. Lu, L. M. Song, S. J. Zheng, C. K. Li, Z. X. Li, G. L. Huang, Q. C. Zhao, on behalf of the Insight-HXMT team chenyp@ihep.ac.cn Credentialed by: Yu-Peng Chen (chenyp@ihep.ac.cn) The Astronomer's Telegram ATel18024 MAXI J1750-327 / EP260812c / EP J175003.0-324244 was discovered by MAXI/GSC and Einstein Probe (ATels #17963 and #17964) and was subsequently identified as a black-hole X-ray binary candidate based on its X-ray spectral and timing properties (ATels #17969 and #17974). ... 2026-09-01T02:15:25-00:00 https://www.astronomerstelegram.org/?read=18017 Masanori Akimoto, Shogo Nohara, Hibiki Fujii, Natsuki Maekawa, Kotaro Ninuma, Kenta Fujisawa Masanori Akimoto, Shogo Nohara, Hibiki Fujii, Natsuki Maekawa, Kotaro Ninuma, Kenta Fujisawa m-akimoto2025@yamaguchi-u.ac.jp Credentialed by: Kenta Fujisawa (kenta@yamaguchi-u.ac.jp) The Astronomer's Telegram ATel18017 This contains the same information as ATel #18016 but is correctly formatted. MAXI J1750-327 was discovered as a new X-ray transient by MAXI on 2026-08-13, and was also detected by Einstein Probe as EP 260812c (ATel #17963, #17964). ... 2026-08-28T01:19:55-00:00 https://www.astronomerstelegram.org/?read=18016 Masanori Akimoto, Shogo Nohara, Hibiki Fujii, Natsuki Maekawa, Kotaro Ninuma, Kenta Fujisawa Masanori Akimoto, Shogo Nohara, Hibiki Fujii, Natsuki Maekawa, Kotaro Ninuma, Kenta Fujisawa m-akimoto2025@yamaguchi-u.ac.jp Credentialed by: Kenta Fujisawa (kenta@yamaguchi-u.ac.jp) The Astronomer's Telegram ATel18016 MAXI J1750-327 was discovered as a new X-ray transient by MAXI on 2026-08-13, and was also detected by Einstein Probe as EP 260812c (ATel #17963, #17964). ... 2026-08-28T00:13:05-00:00 https://www.astronomerstelegram.org/?read=18015 Miriam M. Nyamai, Rob P. Fender,, Sara Motta, Noa Grollimund for the X-KAT collaboration Miriam M. Nyamai, Rob P. Fender,, Sara Motta, Noa Grollimund for the X-KAT collaboration nyamai@jive.eu Credentialed by: Miriam Mumbua Nyamai (nyamai@jive.eu) The Astronomer's Telegram ATel18015 As part of the X-KAT Large Survey programme with the MeerKAT telescope, the recurrent black hole X-ray binary GX 339-4 is observed weekly, usually at 1.284 GHz (L-band). ... 2026-08-27T17:43:45-00:00 https://www.astronomerstelegram.org/?read=18010 Rwitika Chatterjee, Vivek Kumar Agrawal, Biswajit Paul, Anuj Nandi Rwitika Chatterjee, Vivek Kumar Agrawal, Biswajit Paul, Anuj Nandi rwitika@ursc.gov.in Credentialed by: Rwitika Chatterjee (rwitika@ursc.gov.in) The Astronomer's Telegram ATel18010 MAXI J1750-327 was discovered as a new X-ray transient by the MAXI/GSC nova alert system on 2026 August 13 (ATel #17963), with the source also detected by the EP/WXT approximately five hours earlier and designated EP260812c (ATel #17964). ... 2026-08-25T18:30:42-00:00 https://www.astronomerstelegram.org/?read=18007 A. J. Tetarenko, E. Lescure, A. Bahramian, J. C.A. Miller-Jones, P. Casella, N. Castro Segura, P. Gandhi, T. J. Maccarrone, A. Marino, T. D. Russell, J. van den Eijnden, and F. M. Vincentelli A. J. Tetarenko, E. Lescure, A. Bahramian, J. C.A. Miller-Jones, P. Casella, N. Castro Segura, P. Gandhi, T. J. Maccarrone, A. Marino, T. D. Russell, J. van den Eijnden, and F. M. Vincentelli alexandra.tetarenko@uleth.ca Credentialed by: Alexandra Tetarenko (alexandra.tetarenko@uleth.ca) The Astronomer's Telegram ATel18007 www.astronomerstelegram.org/?read=17963 > 17963, #17964). Since then, it has been extensively characterized through X-ray (ATels #17969, #17974, #17983, #17993, #18004), optical/near-infrared (ATels #17971, #17977, #17988, #17990), and radio (ATel #17979) observations. ... 2026-08-25T10:23:37-00:00 https://www.astronomerstelegram.org/?read=18004 S. Mandel, K. Mori, C. Hailey, M. Parra, A. Marino, N. Degenaar, R. Wijnands, J. Tomsick, M. Bachetti, P. Draghis, J. Grindlay, J. Hong, G. Ponti, M. Reynolds S. Mandel, K. Mori, C. Hailey, M. Parra, A. Marino, N. Degenaar, R. Wijnands, J. Tomsick, M. Bachetti, P. Draghis, J. Grindlay, J. Hong, G. Ponti, M. Reynolds ss5018@columbia.edu Credentialed by: Shifra Mandel (ss5018@columbia.edu) The Astronomer's Telegram ATel18004 We report on a follow-up NuSTAR observation of the new X-ray transient MAXI J1750-327, which was detected by MAXI on Aug. 13, 2026 (ATel #17963), as well as by Einstein Probe WXT on Aug. ... 2026-08-25T01:43:18-00:00