# x-ray (news sources) — RSS Amplifier Recent posts from the 1 feeds in the RSS Amplifier directory that cover x-ray. Page: Feed: --- ## [ATel 17998: Intense solar activity near the limbs: monitoring AR4513](https://www.astronomerstelegram.org/?read=17998) _2026-08-21 · The Astronomer's Telegram: Top ATels_ After two weeks with the X-ray background down at the B2-B3 level, the solar activity returned to near X-class conditions on 20 August 2026. The renewed activity is primarily associated with the active region AR 4513 at the eastern limb, which produced M2-, M8-, and M3-class flares, followed by additional C-class events on 21 August. ... ## [ATel 17997: SVOM/ECLAIRs detection of the symbiotic low-mass X-ray binary 4U 1700+24](https://www.astronomerstelegram.org/?read=17997) _2026-08-21 · The Astronomer's Telegram: Top ATels_ On Tuesday, August 18, 2026, at 14:41:30.099 UT, the onboard trigger software of the SVOM/ECLAIRs telescope (4-150 keV) detected and localized a source at R.A. ... ## [ATel 17996: Erratum to ATel #17984: Post-outburst morphology and polarization behavior of the short-periodical comet 220P/McNaught](https://www.astronomerstelegram.org/?read=17996) _2026-08-20 · The Astronomer's Telegram: Top ATels_ This is an erratum to ATel #17984. Due to an error in our newly developed calibration software, the originally listed values of the degree of linear polarization (DoLP) are incorrect. ... ## [ATel 17995: Liverpool Telescope spectroscopy identifies TCP J18251276-2225293 as an Fe II-type nova](https://www.astronomerstelegram.org/?read=17995) _2026-08-20 · The Astronomer's Telegram: Top ATels_ The NMW-TexasTech survey (Rokinon 135-mm f/2.2 telephoto lenses + QHY600PH-M CMOS camera) discovered an optical transient of 9.4 mag in Sagittarius on 2026 Aug 19.1063 UTC. ... ## [ATel 17994: XRISM/Xtend Transient Search (XTS) detected an X-ray flare from CD-61 901](https://www.astronomerstelegram.org/?read=17994) _2026-08-20 · The Astronomer's Telegram: Top ATels_ XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J0433-6129 on 2026-08-18 TT. The source position is determined to be (R.A., Dec.) = (68.486, -61.493), with a systematic error of & sim;40 arcsec. ... ## [ATel 17993: SVOM follow-up on MAXI J1750-327/EP260812c](https://www.astronomerstelegram.org/?read=17993) _2026-08-20 · The Astronomer's Telegram: Top ATels_ We report on SVOM Target-of-Opportunity (ToO) follow-up observations of MAXI J1750-327/EP260812c, a new black hole transient discovered by MAXI/GSC (ATel #17963) and Einstein Probe/WXT (ATel #17964) on August 12, 2026 (see also ATels #17969, #17971, #17974, #17977, #17978, #17979, #17983, #17988, and #17990). ... ## [ATel 17992: OAUNI multicolor photometry of SN 2026fov](https://www.astronomerstelegram.org/?read=17992) _2026-08-19 · The Astronomer's Telegram: Top ATels_ We report multicolor photometric observations of the Type II supernova SN 2026fov (TNSTR-2026-1076, TNSCR-2026-1145), obtained using the OAUNI 51cm telescope (arXiv:1512.03104) at the Huancayo Observatory, Peru. ... ## [ATel 17991: Spectroscopic Classification of Astrophysical Transients with Keck II + KCWI](https://www.astronomerstelegram.org/?read=17991) _2026-08-19 · The Astronomer's Telegram: Top ATels_ We report the classification of AT2026tiz and AT2026wza from spectroscopic observations with the Keck Cosmic Web Imager (KCWI) on the Keck II telescope obtained on 2026 August 14 UT. ... ## [ATel 17990: GTC spectroscopy of MAXI J1750-327](https://www.astronomerstelegram.org/?read=17990) _2026-08-19 · The Astronomer's Telegram: Top ATels_ We report on optical spectroscopy of the recently discovered X-ray transient MAXI J1750-327 / EP J175003.0-324244 (ATels #17963, #17964), whose multi-wavelength properties are consistent with a black hole X-ray binary in outburst (ATels #17969, #17971, #17974, #17977, #17978, #17979, #17983, #17988). ... ## [ATel 17989: Spectroscopic Classification of TCP J18251276-2225293 as a Classical Nova](https://www.astronomerstelegram.org/?read=17989) _2026-08-19 · The Astronomer's Telegram: Top ATels_ I report the spectroscopic classification of TCP J18251276-2225293 (ATel #17987) as a classical nova. I obtained its spectrum on 2026-08-19.482 UT with the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. ... ## [Every Channel. One Login. (Sponsored)](https://crawlproof.com/a/IrzMPYSrIKx8) _2026-08-19 · **Sponsored**_ 17,000+ live channels, movies and sports on any device. Free trial, no IP lock. ## [ATel 17988: PRIME early detection and pre-outburst upper limit for the NIR counterpart to MAXI J1750-327](https://www.astronomerstelegram.org/?read=17988) _2026-08-19 · The Astronomer's Telegram: Top ATels_ We report the NIR detection of the counterpart to the recently discovered X-ray transient MAXI J1750-327 / EP J175003.0-324244 with the PRime-focus Infrared Microlensing Experiment (PRIME). ... ## [ATel 17987: Galactic Nova candidate TCP J18251276-2225293](https://www.astronomerstelegram.org/?read=17987) _2026-08-19 · The Astronomer's Telegram: Top ATels_ We report discovery of a galactic nova candidate TCP J18251276-2225293. The transient was discovered by the NMW-TexasTech survey on 2026-08-19.1063 UTC at an unfiltered magnitude of 9.4. ... ## [ATel 17986: First X-ray polarimetric measurement of Her X-1 in the anomalous low state](https://www.astronomerstelegram.org/?read=17986) _2026-08-19 · The Astronomer's Telegram: Top ATels_ The accreting X-ray pulsar Her X-1 (HZ Her) is currently undergoing a rare anomalous low state (ALS), during which the normal 35-day X-ray cycle is strongly suppressed. ...