The on-site analysis of the cherenkov telescope array

Andrea Bulgarelli, Valentina Fioretti, Andrea Zoli, Alessio Aboudan, Juan José Rodríguez-Vázquez, Giovanni De Cesare, Adriano De Rosa, Gernot Maier, Etienne Lyard, Denis Bastieri, Saverio Lombardi, Gino Tosti, Sonia Bergamaschi, Domenico Beneventano, Giovanni Lamanna, Jean Jacquemier, Karl Kosack, Lucio Angelo Antonelli, Catherine Boisson, Jerzy BorkowskiSara Buson, Alessandro Carosi, Vito Conforti, Pep Colomé, Raquel De Los Reyes, Jon Dumm, Phil Evans, Lucy Fortson, Matthias Fuessling, Diego Gotz, Ricardo Graciani, Fulvio Gianotti, Paola Grandi, Jim Hinton, Brian Humensky, Susumu Inoue, Jürgen Knödlseder, Thierry Le Flour, Rico Lindemann, Giuseppe Malaguti, Sera Markoff, Martino Marisaldi, Nadine Neyroud, Luciano Nicastro, Stefan Ohm, Julian Osborne, Igor Oya, Jerome Rodriguez, Simon Rosen, Marc Ribo, Alessandro Tacchini, Fabian Schüssle, Thierry Stolarczyk, Eleonora Torresi, Vincenzo Testa, Peter Wegner, Amanda Weinstein

Research output: Contribution to journalConference articlepeer-review


The Cherenkov Telescope Array (CTA) observatory will be one of the largest ground-based veryhigh- energy gamma-ray observatories. The On-Site Analysis will be the first CTA scientific analysis of data acquired from the array of telescopes, in both northern and southern sites. The On-Site Analysis will have two pipelines: the Level-A pipeline (also known as Real-Time Analysis, RTA) and the level-B one. The RTA performs data quality monitoring and must be able to issue automated alerts on variable and transient astrophysical sources within 30 seconds from the last acquired Cherenkov event that contributes to the alert, with a sensitivity not worse than the one achieved by the final pipeline by more than a factor of 3. The Level-B Analysis has a better sensitivity (not be worse than the final one by a factor of 2) and the results should be available within 10 hours from the acquisition of the data: for this reason this analysis could be performed at the end of an observation or next morning. The latency (in particular for the RTA) and the sensitivity requirements are challenging because of the large data rate, a few GByte/s. The remote connection to the CTA candidate site with a rather limited network bandwidth makes the issue of the exported data size extremely critical and prevents any kind of processing in real-time of the data outside the site of the telescopes. For these reasons the analysis will be performed on-site with infrastructures co-located with the telescopes, with limited electrical power availability and with a reduced possibility of human intervention. This means, for example, that the on-site hardware infrastructure should have low-power consumption. A substantial effort towards the optimization of high-throughput computing service is envisioned to provide hardware and software solutions with high-throughput, low-power consumption at a low-cost. This contribution provides a summary of the design of the on-site analysis and reports some prototyping activities.

Original languageEnglish (US)
Article number763
JournalProceedings of Science
StatePublished - 2015
Event34th International Cosmic Ray Conference, ICRC 2015 - The Hague, Netherlands
Duration: Jul 30 2015Aug 6 2015


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