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VOEvent An Information Infrastructure for Immediate Astronomical Events

VOEvent An Information Infrastructure for Immediate Astronomical Events. Roy Williams roy@caltech.edu NVO co-director. IVOA working group VOEvent. http://www.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent. Define semantics of message Draft document for discussion

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VOEvent An Information Infrastructure for Immediate Astronomical Events

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  1. VOEventAn Information Infrastructure for Immediate Astronomical Events Roy Williams roy@caltech.edu NVO co-director

  2. IVOA working group VOEvent http://www.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent • Define semantics of message • Draft document for discussion • Curation, Wherewhen, How, What, Hypothesis • Start vocabulary • Based on UCD -- IVOA standard • Work with Strasbourg experts • Use existing schema where possible • IVOA, RTML, STC • Buy-in from communities • GRB/Swift, RTML, LIGO, Raptor, • LSST, Palomar-Quest, PanStarrs, • etc etc

  3. Current systems • Partial List • IAU telegrams • Gamma-ray Coordinate Network • Astronomer's telegram • Global Microlensing Array Network • ???? • Text-based • meaning human-based • Email-based • all messages to all subscribers

  4. Proposed system • Curation • from IVOA curation schema, from Dublin Core • When, Where • STC? Simple? • How • instrument state • different schema for different instruments • RTML • What • exactly what was seen • different schema for different instruments • Hypothesis • probability list of: • supernova, comet, asteroid, ..... • how can we make this list?

  5. Proposed system • Event has ivo:// identifier • Citation • Keep it light -- no data in VOEvent-- use links • Subscription/query • get only the events you want • based on complex criteria • crossmatch event libraries • Transport fabric • for human: email, cellphone • for robot: web-service, auto-email

  6. VOEvent: General Info • Who is making this report? • From VORegistry • Based on Dublin Core

  7. Dublin Core Title: A name given to the resource. Creator: An entity primarily responsible for making the content of the resource. Subject: A topic of the content of the resource. Description: An account of the content of the resource. Publisher: An entity responsible for making the resource available Contributor: An entity responsible for making contributions to the content of the resource. Date: A date of an event in the lifecycle of the resource. Type: The nature or genre of the content of the resource. Format: The physical or digital manifestation of the resource. Identifier: An unambiguous reference to the resource within a given context. Source: A Reference to a resource from which the present resource is derived. Language: A language of the intellectual content of the resource. Relation: A reference to a related resource. Coverage: The extent or scope of the content of the resource. Rights: Information about rights held in and over the resource.

  8. VOEvent: Where and When • Where in the sky and when? • Simple: • RA, Dec in J2000 + Julian Day • Not good enough for precise positions • Sophisticated • How to ease burden of interpretation • Space-Time Coordinates • Where was the observer? • What about nutation? • What about surface of Mars?

  9. VOEvent: How • How was the event detected? • Instrument description: which is in there? • “Used Gunn R filter” • “Used MySpecial filter” • Camera darks and flats files at http://…. • “Dome didn’t open until 3am” • Instrument-specific for accurate info

  10. VOEvent: What was detected? • Instrument independent • Magnitude increase • GW strain • Good candidate for UCD • eg phot.color.Gunn (Color index in Gunn system) • Instrument dependent • Mag increase in MyFilter • Trigger number 736 with SNR=6

  11. VOEvent: Classification • What do we think happened? • How to build ontology?

  12. Event Vocabulary • Astronomer’s telegram • Radio, Millimeter, Sub-Millimeter, Far-Infra-Red, Infra-Red, Optical, Ultra-Violet, X-ray, Gamma Ray, >GeV • Request for Observations, A Comment, • AGN, Asteroids, Binaries, Black Holes, Comets, Cosmic Rays, Cataclysmic Variables, Globular Clusters, Gamma-Ray Bursts, Meteors, Microlensing Events, Neutron Stars, Novae, Planets, Planets (minor), Pulsars, Quasars, Soft Gamma-ray Repeaters, Solar System Objects, The Sun, Supernovae, Supernova Remnants, Transients, Variables, Stars • UCD • IR, UV, X-ray, gamma, mm, opt, radio • Each in categories • em.line.Brgamma Bracket gamma line • em.UV.100-200nm Ultraviolet between 100 and 200 nm • em.X-ray.soft Soft X-ray • IAU Telegram • Outbursts Of Unusual Variable Stars, Features On Planetary Surfaces

  13. Unified Content Descriptors • UCD is a “semantic type” src.orbital.eccentricity Orbit eccentricity meta.code.mime MIME type pos.gal.lon Longitude in galactic coordinates phys.at.crossSectionAtomic cross-section • Can be resolved by web service • to description, examples, etc

  14. VORegistry as a model for VOEvent?

  15. Registry model alerter publish user get ID VOEvent registry query alerter subscribe user user

  16. Registry model user alerter query publish VOEvent registry harvest VOEvent registry VOEvent registry alerter subscribe user user

  17. Distributed Registry Astrogrid CfA NCSA CDS ESO STScI/JHU NOAO Caltech HEASARC JapanVO Registries as of Jan 05

  18. VO Registry VORegistry Publish service VOIdentifierivo://nvo.caltech/DPOSS#f123 Query service Human via web form VOResource Schemas and instances registry Harvest registry registry Extension schemas Machine via web service Subscribe service

  19. VO Identifiers ivo://mydomain.com / mySkySurvey # file00037.fits • Authority ID • Registered with IVOA • Resolved by registry • Resource ID • Created by Authority • Resolved by registry • Record ID • Not known to registry delimiter delimiter

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