TAILIEUCHUNG - Responding to the Event Deluge

In the late 1990s, the gamma-ray burst (GRB) community ignited the current excitement over transient astronomical events. Gamma-Ray Bursts (GRBs) were a real enigma until ultra-fast event dissemination allowed optical identification of afterglows, leading to rich data and rich science. The events back then were both valuable and infrequent: every new GRB could make a career for a young astronomer, and they were only detected every few days. However, in the next few years, surveys carried out by telescopes such as Gaia, LOFAR, Pan-STARRS, LSST and SKA will produce a flood of hundreds of events every 24 hours, with the scientific jewels surrounded by dross,. | Responding to the Event Deluge Roy D. Williamsa Scott D. Barthelmyb Robert B. Dennyc Matthew J. Grahama and John Swinbankd aCalifornia Institute of Technology bNASA Goddard Space Flight Center cDC-3 Dreams SP d University of Amsterdam ABSTRACT We present the VOEventNet infrastructure for large-scale rapid follow-up of astronomical events including selection annotation machine intelligence and coordination of observations. The VOEvent standard is central to this vision with distributed and replicated services rather than centralized facilities. We also describe some of the event brokers services and software that are connected to the network. These technologies will become more important in the coming years with new event streams from Gaia LOFAR LIGO LSST and many others. Keywords VOEvent GCN TAN Skyalert transients 1. Deluge In the late 1990s the gamma-ray burst GRB community ignited the current excitement over transient astronomical events. Gamma-Ray Bursts GRBs were a real enigma until ultra-fast event dissemination allowed optical identification of afterglows leading to rich data and rich science. The events back then were both valuable and infrequent every new GRB could make a career for a young astronomer and they were only detected every few days. However in the next few years surveys carried out by telescopes such as Gaia LOFAR Pan-STARRS LSST and SKA will produce a flood of hundreds of events every 24 hours with the scientific jewels surrounded by dross and so both scalability and discrimination will be increasingly important. We should also point out that a deluge of event metadata is also coming as more transient surveys come online and each of those spawns its own streams of follow-up events and annotations. Follow-up observation will be in short supply in the era of the event deluge. Faint objects can only be observed with the largest telescopes that are already over-subscribed and objects with uncertain position require deep wide-field imaging to look

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