The Atacama Cosmology Telescope: Detection of Millimeter-wave Transient Sources

@article{Naess2021TheAC,
  title={The Atacama Cosmology Telescope: Detection of Millimeter-wave Transient Sources},
  author={Sigurd Naess and Nicholas Battaglia and J. Richard Bond and Erminia Calabrese and Steve K. Choi and Nicholas F. Cothard and Mark J. Devlin and Cody J. Duell and Adriaan J. Duivenvoorden and Jo Dunkley and Rolando Dunner and Patricio A. Gallardo and Megan Gralla and Yilun Guan and Mark Halpern and J. Colin Hill and Matt Hilton and Kevin M. Huffenberger and Brian J. Koopman and Arthur B. Kosowsky and Mathew S. Madhavacheril and Jeff J. McMahon and Federico Nati and Michael D. Niemack and Lyman A. Page and Bruce Partridge and Maria Salatino and Neelima Sehgal and David N. Spergel and Suzanne Staggs and Edward J. Wollack and Zhilei Xu},
  journal={The Astrophysical Journal},
  year={2021},
  volume={915}
}
We report on the serendipitous discovery of three transient millimeter-wave sources using data from the Atacama Cosmology Telescope. The first, detected at R.A. = 273.8138, decl. = −49.4628 at ∼50σ total, brightened from less than 5 mJy to at least 1100 mJy at 150 GHz with an unknown rise time shorter than 13 days, during which the increase from 250 mJy to 1100 mJy took only 8 minutes. Maximum flux was observed on 2019 November 8. The source’s spectral index in flux between 90–150 GHz was… 
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