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2020

The Atacama Cosmology Telescope: Detection of mm-wave transient sources

Naess, Sigurd, Battaglia, Nick, Bond, J. Richard et al.

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We report on the serendipitous discovery of three transient mm-wave sources using data from the Atacama Cosmology Telescope.

The first, detected at RA = 273.8138, dec = -49.4628 at ${\sim}50\sigma$ total, brightened from less than 5 mJy to at least 1100 mJy at 150 GHz with an unknown rise time shorter than thirteen days, during which the increase from 250 mJy to 1100 mJy took only 8 minutes.
Maximum flux was observed on 2019-11-8.
The source's spectral index in flux between 90 and 150 GHz was positive, $\alpha = 1.5\pm0.2$.

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