Search Results for author: C. Fremling

Found 4 papers, 3 papers with code

SNGuess: A method for the selection of young extragalactic transients

1 code implementation • 13 Aug 2022 • N. Miranda, J. C. Freytag, J. Nordin, R. Biswas, V. Brinnel, C. Fremling, M. Kowalski, A. Mahabal, S. Reusch, J. van Santen

Approximately 88% of the candidates suggested by SNGuess from a set of alerts from ZTF spanning from April 2020 to August 2021 were found to be true relevant supernovae (SNe).

Astronomy

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AT 2019avd: A novel addition to the diverse population of nuclear transients

no code implementations • 21 Jan 2021 • A. Malyali, A. Rau, A. Merloni, K. Nandra, J. Buchner, Z. Liu, S. Gezari, J. Sollerman, B. Shappee, B. Trakhtenbrot, I. Arcavi, C. Ricci, S. van Velzen, A. Goobar, S. Frederick, A. Kawka, L. Tartaglia, J. Burke, D. Hiramatsu, M. Schramm, D. van der Boom, G. Anderson, J. C. A. Miller-Jones, E. Bellm, A. Drake, D. Duev, C. Fremling, M. Graham, F. Masci, B. Rusholme, M. Soumagnac, R. Walters

We report on SRG/eROSITA, ZTF, ASAS-SN, Las Cumbres, NEOWISE-R, and Swift XRT/UVOT observations of the unique ongoing event AT 2019avd, located in the nucleus of a previously inactive galaxy at $z=0. 029$.

High Energy Astrophysical Phenomena

Paper
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The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at $z=0.27$

1 code implementation • 2 Mar 2020 • Anna Y. Q. Ho, D. A. Perley, S. R. Kulkarni, D. Z. J. Dong, K. De, P. Chandra, I. Andreoni, E. C. Bellm, K. B. Burdge, M. Coughlin, R. Dekany, M. Feeney, D. D. Frederiks, C. Fremling, V. Z. Golkhou, M. Graham, D. Hale, G. Helou, A. Horesh, R. R. Laher, F. Masci, A. A. Miller, M. Porter, A. Ridnaia, B. Rusholme, D. L. Shupe, M. T. Soumagnac, D. S. Svinkin

Compiling transients in the literature with $t_\mathrm{rise} <5$d and $M_\mathrm{peak}<-20$mag, we find that a significant number are engine-powered, and suggest that the high peak optical luminosity is directly related to the presence of this engine.

High Energy Astrophysical Phenomena

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Machine Learning for the Zwicky Transient Facility

1 code implementation • 5 Feb 2019 • Ashish Mahabal, Umaa Rebbapragada, Richard Walters, Frank J. Masci, Nadejda Blagorodnova, Jan van Roestel, Quan-Zhi Ye, Rahul Biswas, Kevin Burdge, Chan-Kao Chang, Dmitry A. Duev, V. Zach Golkhou, Adam A. Miller, Jakob Nordin, Charlotte Ward, Scott Adams, Eric C. Bellm, Doug Branton, Brian Bue, Chris Cannella, Andrew Connolly, Richard Dekany, Ulrich Feindt, Tiara Hung, Lucy Fortson, Sara Frederick, C. Fremling, Suvi Gezari, Matthew Graham, Steven Groom, Mansi M. Kasliwal, Shrinivas Kulkarni, Thomas Kupfer, Hsing Wen Lin, Chris Lintott, Ragnhild Lunnan, John Parejko, Thomas A. Prince, Reed Riddle, Ben Rusholme, Nicholas Saunders, Nima Sedaghat, David L. Shupe, Leo P. Singer, Maayane T. Soumagnac, Paula Szkody, Yutaro Tachibana, Kushal Tirumala, Sjoert van Velzen, Darryl Wright

The Zwicky Transient Facility is a large optical survey in multiple filters producing hundreds of thousands of transient alerts per night.

Instrumentation and Methods for Astrophysics

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