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VOEvent NVO Summer School September 2006 Roy Williams NVO.Caltech Alasdair Allen Joshua Bloom Andrew Drake Matthew Graham Rob Seaman Robert White.... and.

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Presentation on theme: "VOEvent NVO Summer School September 2006 Roy Williams NVO.Caltech Alasdair Allen Joshua Bloom Andrew Drake Matthew Graham Rob Seaman Robert White.... and."— Presentation transcript:

1 VOEvent NVO Summer School September 2006 Roy Williams NVO.Caltech Alasdair Allen Joshua Bloom Andrew Drake Matthew Graham Rob Seaman Robert White.... and many others image of Cas A

2 Multiple Event Streams Swift (Barthelmy) HETE2 (Butler) Integral (Djorgovski will consult) Raptor (Vestrand/White) SDSS supernova search (Becker/Masao) KAIT (Fillipenko/Li) Microlensing Planet Search (Gaudi) Essence (Smith, Wood-Vesey) Palomar-Quest (Djorgovski) Pairitel (Bloom) Panstars (Kaiser, Price) AAVSO (Price) XTE satellite (Remillard) Glast (E. Bloom) Allen Telescope Array (Bower) KAIT (Fillipenko/Li) Pairitel (Bloom) Palomar P60 (Kulkarni) Robonet (Steele) AAVSO (Price) Raptor (Vestrand/White) Gemini (8 meter telescopes) ROTSE (Akerlof) Prompt (Reichart) CTIO Smarts (Cobb, Baylan) Event Authors Robotic Telescopes

3 VOEvent transport model Publisher Subscriber Author immediate push digest (RSS) resolve query Multiple authors, publishers, subscribers Structured, semantically rich, for machine understanding XML representation Standard transports (web service, , etc) Standard global identifiers Repository client Aggregator Filter

4 Caltech Exeter LANL NOAO SDSS SNe U Washington/Stanford Pairitel Berkeley Palomar P60 Caltech Palomar-Quest Caltech Raptor LANL Liverpool Telescope La Palma UKIRT Hawaii Author Publisher Repository Relay Subscriber Faulkes Hawaii/Australia OGLE III Poland GCN NASA/GSFC Microlensing Survey Exeter CTIO/KPNO surveys VOEventNet and eStar

5 Roles Author Scientific Responsibility Metadata same as IVOA Organization title, shortName, description, logo, contact (Name, , Phone), Contributor Publisher XML Responsibility Creates unique IVORN Subscription interface Repository Resolves IVORNs Query interface (SEAP) Relays, Filters, and Brokers Combinations of basic roles

6 VOEvent Structure Who Publisher, Contact, etc Subscribers will use AuthorIVORN to select WhereWhen (== STC) Can be simple eg RA, Dec, eg UTC Can be sophisticated, eg multiple frames, near objects, etc What Hierarchy of named parameters Units, Semantic type (UCD) References, Descriptions How How was the evidence gathered: camera, telescope, etc Why probability list of interpretation supernova, comet, asteroid,..... Citation Link to other VOEvent: Followup, Supercede, Retraction, Link to support data Reference Supporting material, eg lightcurve, image

7 is the scientifically-responsible Author? Rapid Telescope for Optical Response Raptor Robert White ivo://raptor.lanl/organization or An IVORN for an organization Easier for Subscribers to find Author Shorter packet

8 was actually observed Parser can cast this Group to class phot_pt A time sequence of R- magnitudes

9 do we think this happened? Tycho's Stella Nova SN Ia 3C 10 supernova remnant Importance of the event observation should I interrupt my telescope schedule? Publisher thinks (prob=0.98) this is a SN1a with given name Possibility this is associated with object 3C10 For draft controlled vocab for concepts see

10 Space-Time Coordinates T23:59:

11 STC adopted (No more mealy-mouthed nonsense about RA and Dec elements) pseudocode Let x = WhereWhen/ObsDataLocation/ ObservationLocation/AstroCoords If then Let Time = x/Time/TimeInstant/ISOTime Let RA = x/Position2D/Value2/C1 Let Dec = x/Position2D/Value2/C2 < ObsDataLocation xmlns="" xmlns:xlink=""> T23:59:

12 VO Identifiers Registry finds the VOEvent repository Repository finds the specific event ivo://pq.nvo.caltech/VOEPublisher # c Publisher IVORN Resolved by registry to find repositories Local ID Not known to registry Created by Publisher Known to event repository delimiter Event IVORN (whole thing)

13 VOEvent and Registry Author may be registered may be cited by IVORN in VOEvent packet Saves typing Easier for subscriber to pick known authors equivalence of with IVOA Organization Publisher is registered List of authors, How to subscribe Repository is registered Which publishers are kept IVORN resolution. Query interface

14 Author (science) Publisher (identifier, signature) Repository Registry Usage for VOEvent Client 1.Resolve identifier ivo://publisherID#localID 2. Which repositories have events from this publisher? 3: Send localID 4: Receive event metadata publish event store event VO Global Registry Subscribers

15 Citation An event can cite another ivo://gcn.nasa/VOEvent#hete_389241a_ _ Observations can be federated by mutual citation followup observation event collection

16 Control Author A sends event E to Subscriber S Subscriber software decides on action.... S can followup everything from A S can followup if importance > threshold (importance is part of every event) S can followup if prob(Supernova) > threshhold section has hypothesis, concept, association S can examine the parameters, images, lightcurves section is observations

17 Transport Querying and web pages as usual client connects to server RSS polling is like this Subscription One of Client keeps open socket to server Server keeps open connection to client (GCN model) Subscriber protocol Jabber/XMPP -- popular IM protocol Home made -- TCP Vanilla Java Messaging One-way SOAP (port 80)

18 VOEvent Structure Event has ivo:// identifier (the IVORN) Citation Keep it light -- no data in VOEvent-- use links Citation connects events Discovery, Followup, Supercede, Join, Predict Subscription / query / digest (RSS) get only the events you want based on complex criteria based on publisher crossmatch event libraries Transport fabric for human: , cellphone, IM for robot: IM, web-service, auto- , socket

19 Queries for VO Registry Tell me about this Author Tell me about this Publisher Tell me about this Repository Which Publisher has this Author? Which Repository has this Publisher?

20 VOEvents snuffling and snuggling all over the internet.....

21 Event Synthesis Engine Pairitel Palomar 60 Raptor PQ next-day pipelines catalog Palomar-Quest known Variables known asteroids SDSS 2MASS PQ Event Factory remote archives baseline sky eStar VOEventNet VOEventNet: a Rapid-Response Telescope Grid VOEvent database

22 click here for voeventnet website

23 VOEventnet for GRBs

24 Joining VOEventNet VOclient application C, Java, or Perl Uses Jabber pubsub jabber server is Can publish and subscribe Current event streams: gcnevents (GCN GRB events) estar (OGLE microlensing events lanl (Alternate GCN GRB stream and RAPTOR follow up) sdssss (Sloan Digitial Sky Survey Supernovae)

25 OGLE Example OGLE III Project (via eSTAR Project) Andrzej Udalski T15:50:

26 OGLE example

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