The Astronomer's Telegram: Top ATels
For reporting and commenting upon new observations of astronomical transients by the professional astrophysics community.
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Latest posts
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ATel 18138: Detection of optical coronal lines in V488 Sge (Nova Sge 2026)
We report the detection of coronal transitions in low (R ~ 500-1200) grating spectra of V488 Sge (ATel#18009) spanning 3780 - 7510A obtained between 2026 Oct 20.8 and 30.81UT. ...
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ATel 18137: EP-WXT detection of X-ray brightening from QSO B2344+514
We report on the detection of the brightening of QSO B2344+514 by the Wide-field X-ray Telescope (WXT) on board Einstein Probe (EP). Starting from 2026 October 8, the 0.5-4 keV flux increased from the low-state value of a few times of 10^-11 erg cm^-2 s^-1 to the current value…
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ATel 18136: X-ray rebrightening of the X-ray transient MAXI J1609-487
The MAXI/GSC nova alert system triggered on the X-ray rebrightening of the X-ray transient MAXI J1609-487 at 00:18 UT on October 31, 2026. The source flux had been almost steady at 33 +/- 6 mCrab in the 4-10 keV band from 05:43 on Oct. ...
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ATel 18135: XMM-Newton Observations during the supersoft phase of nova V488 Sge
We report X-ray and ultraviolet observations of the recent nova V488 Sge obtained with the XMM-Newton satellite on October 21 2026, 57 days after optical maximum (ObsID: 0992191201). ...
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ATel 18134: Spatially resolved spectroscopy of 3I/ATLAS with Gemini North/GMOS IFU on 2025 November 26
We obtained integral-field spectra of interstellar comet 3I/ATLAS (Bolin et al. 2025, MNRAS, 542, L139) on 2025 November 26 UTC with Gemini North/GMOS (GN-2025B-DD-102; PI B. ...
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ATel 18133: Keck/MOSFIRE near-infrared imaging and colors of 3I/ATLAS on 2026 February 6
We obtained J, H, and Ks images of interstellar comet 3I/ATLAS (Bolin et al. 2025, MNRAS, 542, L139) on 2026 February 6 UTC using MOSFIRE on the 10-m Keck I telescope (2026A N045; PI I. ...
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ATel 18132: 3I/ATLAS in February 2026: dust imaging and spectroscopic gas constraints from Gemini North/GMOS
We obtained g, r, i, and Z imaging of interstellar comet 3I/ATLAS (Bolin et al. 2025, MNRAS, 542, L139) on 2026 February 5, 7, and 17 UTC with GMOS on the 8.1-m Gemini North telescope (T15). ...
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ATel 18131: GREENBURST discovery of FRB 20261029A
We report the detection of a fast radio burst, FRB 20261029A, with the Green Bank Telescope using the GREENBURST commensal FRB detection system (Surnis et al. ...
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ATel 18130: Neutral nickel and molecular coma maps of 3I/ATLAS from 2026 January Keck/KCWI spectroscopy
We obtained optical integral-field spectra of interstellar comet 3I/ATLAS (Bolin et al. 2025, MNRAS, 542, L139; Seligman et al. 2025, ApJL, 989, L36) with Keck II/KCWI on 2026 January 19 UTC (2025B N068; PI I. ...
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ATel 18129: Nova V488 Sge Is Forming Dust
Galactic classical nova V488 Sge was discovered on 2026 Aug 25 (CBET #5729, ATel #18008), and has been the subject of intensive AAVSO photometric coverage in the optical bands. ...
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ATel 18128: Coma and tail morphology of 3I/ATLAS from 2025 September Gemini South/GMOS multiband imaging
The comet-aligned images show an extended coma and antisolar tail, continuing the morphology reported for August 27-28 in ATel #17363. We observed interstellar comet 3I/ATLAS (Bolin et al. ...
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ATel 18127: Detection of dust in the nova V572 Velorum from SPHEREx observations
V572 Velorum ( Nova Velorum 2025) was discovered by John Seach, and independently by Andrew Pearce, on 25 June 2025 (CBET 5574) at an apparent visual magnitude of 5.7. ...
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ATel 18126: Four-band near-infrared imaging of 3I/ATLAS: Keck/MOSFIRE observations on 2025 July 11
We obtained Y, J, H, and Ks observations of interstellar comet 3I/ATLAS (Bolin et al. 2025, MNRAS, 542, L139) with MOSFIRE on Keck I on 2025 July 11 UTC, through engineering program 2025A E498 (PI: Josh Walawender). ...