TY - JOUR
T1 - The Atacama cosmology telescope
T2 - flux upper limits from a targeted search for extragalactic transients
AU - Hervías-Caimapo, Carlos
AU - Naess, Sigurd
AU - Hincks, Adam D.
AU - Calabrese, Erminia
AU - Devlin, Mark J.
AU - Dunkley, Jo
AU - Dünner, Rolando
AU - Gallardo, Patricio A.
AU - Hilton, Matt
AU - Ho, Anna Y.Q.
AU - Huffenberger, Kevin M.
AU - Ma, Xiaoyi
AU - Madhavacheril, Mathew S.
AU - Niemack, Michael D.
AU - Orlowski-Scherer, John
AU - Page, Lyman A.
AU - Partridge, Bruce
AU - Puddu, Roberto
AU - Salatino, Maria
AU - Sifón, Cristóbal
AU - Staggs, Suzanne T.
AU - Vargas, Cristian
AU - Vavagiakis, Eve M.
AU - Wollack, Edward J.
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/4/1
Y1 - 2024/4/1
N2 - We have performed targeted searches of known extragalactic transient events at millimetre wavelengths using nine seasons (2013–2021) of 98, 150, and 229 GHz Atacama Cosmology Telescope (ACT) observations that mapped ∼40 per cent of the sky for most of the data volume. Our data cover 88 gamma-ray bursts (GRBs), 12 tidal disruption events (TDEs), and 203 other transients, including supernovae (SNe). We stack our ACT observations to increase the signal-to-noise ratio of the maps. In all cases but one, we do not detect these transients in the ACT data. The single candidate detection (event AT2019ppm), seen at ∼5σ significance in our data, appears to be due to active galactic nuclei activity in the host galaxy coincident with a transient alert. For each source in our search we provide flux upper limits. For example, the medians for the 95 per cent confidence upper limits at 98 GHz are 15, 18, and 16 mJy for GRBs, SNe, and TDEs, respectively, in the first month after discovery. The projected sensitivity of future wide-area cosmic microwave background surveys should be sufficient to detect many of these events using the methods described in this paper.
AB - We have performed targeted searches of known extragalactic transient events at millimetre wavelengths using nine seasons (2013–2021) of 98, 150, and 229 GHz Atacama Cosmology Telescope (ACT) observations that mapped ∼40 per cent of the sky for most of the data volume. Our data cover 88 gamma-ray bursts (GRBs), 12 tidal disruption events (TDEs), and 203 other transients, including supernovae (SNe). We stack our ACT observations to increase the signal-to-noise ratio of the maps. In all cases but one, we do not detect these transients in the ACT data. The single candidate detection (event AT2019ppm), seen at ∼5σ significance in our data, appears to be due to active galactic nuclei activity in the host galaxy coincident with a transient alert. For each source in our search we provide flux upper limits. For example, the medians for the 95 per cent confidence upper limits at 98 GHz are 15, 18, and 16 mJy for GRBs, SNe, and TDEs, respectively, in the first month after discovery. The projected sensitivity of future wide-area cosmic microwave background surveys should be sufficient to detect many of these events using the methods described in this paper.
KW - cosmic background radiation
KW - methods: data analysis
KW - transients: gamma-ray bursts
KW - transients: supernovae
KW - transients: tidal disruption events
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U2 - 10.1093/mnras/stae583
DO - 10.1093/mnras/stae583
M3 - Article
AN - SCOPUS:85188803540
SN - 0035-8711
VL - 529
SP - 3020
EP - 3034
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -