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Author (up) Carrasco-Davis, R.; Reyes, E.; Valenzuela, C.; Forster, F.; Estevez, P.A.; Pignata, G.; Bauer, F.E.; Reyes, I.; Sanchez-Saez, P.; Cabrera-Vives, G.; Eyheramendy, S.; Catelan, M.; Arredondo, J.; Castillo-Navarrete, E.; Rodriguez-Mancini, D.; Ruz-Mieres, D.; Moya, A.; Sabatini-Gacitua, L:, Sepulveda-Cobo, C.; Mahabal, A.A.; Silva-Farfan, J.; Camacho-Iniguez, E.; Galbany, L. doi  openurl
  Title Alert Classification for the ALeRCE Broker System: The Real-time Stamp Classifier Type
  Year 2021 Publication Astronomical Journal Abbreviated Journal Astron. J.  
  Volume 162 Issue 6 Pages 231  
  Abstract We present a real-time stamp classifier of astronomical events for the Automatic Learning for the Rapid Classification of Events broker, ALeRCE. The classifier is based on a convolutional neural network, trained on alerts ingested from the Zwicky Transient Facility (ZTF). Using only the science, reference, and difference images of the first detection as inputs, along with the metadata of the alert as features, the classifier is able to correctly classify alerts from active galactic nuclei, supernovae (SNe), variable stars, asteroids, and bogus classes, with high accuracy (similar to 94%) in a balanced test set. In order to find and analyze SN candidates selected by our classifier from the ZTF alert stream, we designed and deployed a visualization tool called SN Hunter, where relevant information about each possible SN is displayed for the experts to choose among candidates to report to the Transient Name Server database. From 2019 June 26 to 2021 February 28, we have reported 6846 SN candidates to date (11.8 candidates per day on average), of which 971 have been confirmed spectroscopically. Our ability to report objects using only a single detection means that 70% of the reported SNe occurred within one day after the first detection. ALeRCE has only reported candidates not otherwise detected or selected by other groups, therefore adding new early transients to the bulk of objects available for early follow-up. Our work represents an important milestone toward rapid alert classifications with the next generation of large etendue telescopes, such as the Vera C. Rubin Observatory.  
  Corporate Author Thesis  
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  Series Volume Series Issue Edition  
  ISSN 0004-6256 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000714746100001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1499  
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