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Message History

We report the discovery and follow-up of two small (-0.7 and -1.1 mag) apparent outbursts of comet 24P/Schaumasse. The first event occurred between two Zwicky Transient Facility (ZTF; Bellm et al. ...

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We report the discovery and follow-up observations of a small (-1.2 mag) apparent outburst of comet 63P/Wild 1. The event was originally recognized by the authors in Zwicky Transient Facility (ZTF; Bellm et al. ...

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We report the discovery of a probable nova in M31 on a co-added 7800-s H_alpha CMOS frame taken on 2026 May 10.030 UT with the 0.4-m telescope at Belec nad Orlici (HVBO). ...

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SPT-SV J222602.8-540533 (ATel #17781) was discovered as a millimeter (mm) transient by the South Pole telescope (SPT) on 2026 April 13 UT. The source exhibited flaring behavior with a inverted spectrum (brighter at 150 GHz than 95 GHz) suggesting that the transient might be self-absorbed at lower frequencies. ...

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We report an ongoing optical flare of the blazar B21420+32 (z=0.681). This source is regularly monitored in the framework of the GASP/WEBT project (WEBT; https://www.oato.inaf.it/blazars/webt/). ...

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