https://www.astronomerstelegram.org Transient, 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=18033 M. Mugrauer, L. Maul, and P. Rajkumari M. Mugrauer, L. Maul, and P. Rajkumari markus@astro.uni-jena.de Credentialed by: Markus Mugrauer (markus@astro.uni-jena.de) The Astronomer's Telegram ATel18033 We carried out follow-up imaging and spectroscopic observations of Nova Sagittae 2026 (ATel #18009) on 1 and 2 September 2026 at the University Observatory Jena. ... 2026-09-07T12:42:45-00:00 https://www.astronomerstelegram.org/?read=18031 M. Nakajima, H. Negoro, M. Serino, S. Sugita, K. Saito, T. Yokoyama, M. Wada, T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, Y. Ishihara, H. Ogaki, M. Shidatsu, C. Kang, M. Uenishi, T. Usuki, S. Yatsuzuka, H. Aoe, 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, H. Negoro, M. Serino, S. Sugita, K. Saito, T. Yokoyama, M. Wada, T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka, T. Sakamoto, Y. Kawakubo, H. Hiramatsu, A. Yoshida, Y. Tsuboi, Y. Ishihara, H. Ogaki, M. Shidatsu, C. Kang, M. Uenishi, T. Usuki, S. Yatsuzuka, H. Aoe, 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 ATel18031 The MAXI/GSC nova alert system triggered an X-ray transient source at (R.A., Dec) = (128 deg, -43 deg) on August 29, 2026 (MJD 61281). Since the source was observed during high-background orbits in late August, its position could not be precisely determined from those scans. ... 2026-09-06T08:02:19-00:00 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=18029 Shatakshi Chamoli, Judhajeet Basu, Sudhanshu Barway, G. C. Anupama, Tanishk Mohan, Aditya Pawan Saikia, Vishwajeet Swain, Sameer Patil, Varun Bhalerao, Srikanth Bandari Shatakshi Chamoli, Judhajeet Basu, Sudhanshu Barway, G. C. Anupama, Tanishk Mohan, Aditya Pawan Saikia, Vishwajeet Swain, Sameer Patil, Varun Bhalerao, Srikanth Bandari shatakshi.chamoli@iiap.res.in Credentialed by: Judhajeet Basu (judhajeet.basu@iiap.res.in) The Astronomer's Telegram ATel18029 We report the spectroscopic classification of AT 2026aabo as a very bright and slowly evolving nova in M31. This transient was first discovered on 2026-08-29T09:28:57 by ZTF Collaboration and reported on TNS at 18.57 mags in the ZTF-g band. ... 2026-09-03T07:45:36-00:00 https://www.astronomerstelegram.org/?read=18027 I. Perez-Fournon, F. Poidevin, A. Lopez-Oramas, D. Aguado, N. Abreu Garcia, D. Cano-Morales, I. Correa-Plasencia, A. E. Hernandez-Diaz, E. Lekaroz-Urriza, M. Magdalena-Rodriguez, M. Quintana-Ansaldo, D. Rodriguez-Fernandez, and J. Uribarri-Dermit I. Perez-Fournon, F. Poidevin, A. Lopez-Oramas, D. Aguado, N. Abreu Garcia, D. Cano-Morales, I. Correa-Plasencia, A. E. Hernandez-Diaz, E. Lekaroz-Urriza, M. Magdalena-Rodriguez, M. Quintana-Ansaldo, D. Rodriguez-Fernandez, and J. Uribarri-Dermit ipf@iac.es Credentialed by: Ismael Perez-Fournon (ipf@iac.es) The Astronomer's Telegram ATel18027 We report ATLAS forced photometry of the bright nova candidate AT 2026aabo (ZTF26abramlb, ATLAS26kqn). This transient was discovered by Anirudh Salgundi on behalf of ZTF (TNS Astronomical Transient Report No. ... 2026-09-02T11:55:55-00:00 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=18023 I. Mereminskiy, A. Semena, A. Lutovinov, S. Molkov, A. Tkachenko I. Mereminskiy, A. Semena, A. Lutovinov, S. Molkov, A. Tkachenko i.a.mereminskiy@gmail.com Credentialed by: Sergei Molkov (molkov@hea.iki.rssi.ru) The Astronomer's Telegram ATel18023 During the observations of the Galactic Plane on Aug. 31, 2026, the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory detected a bright X-ray source at the position of RA, Dec = 249.2598, -49.8590 (estimated 90% containment radius of 10''). ... 2026-08-31T19:02:04-00:00 https://www.astronomerstelegram.org/?read=18021 Paolo Ochner, Costantino Sigismondi, Andrea Reguitti, Alessandro Siviero, Valerio Nobile, Andrea Farina Paolo Ochner, Costantino Sigismondi, Andrea Reguitti, Alessandro Siviero, Valerio Nobile, Andrea Farina andrea.reguitti@inaf.it Credentialed by: Andrea Reguitti (andreareguitti@gmail.com) The Astronomer's Telegram ATel18021 The Nova appeared in Sagitta on August 25.12 UT has been already presented in ATel#18008, ATel#18009, ATel#18012, and ATel#18014. We observed the Nova at the 122 cm Galileo telescope of Asiago during the third Summer Asiago School for Young Astronomers with Galileo Observations (ASYAGO) of 24-29 August 2026. ... 2026-08-30T15:22:50-00:00