From swinbank at transientskp.org Wed Jun 1 09:14:06 2011 From: swinbank at transientskp.org (John Swinbank) Date: Wed, 1 Jun 2011 18:14:06 +0200 Subject: gravitational waves and VOEvent In-Reply-To: <4DDD45B5.7050604@ligo.org> References: <4DDD45B5.7050604@ligo.org> Message-ID: On 25 May 2011 20:08, Roy Williams wrote: > The observation from LIGO will not be well localized, rather a wide > probability map on the sky that may span several constellations -- see for > example (*) . It could be represented in several ways: FITS on an RA/Dec > grid, FITS on a Healpix grid, a set of contour lines of probability, a set > of 'likely galaxies', or something greatly simplified from the full skymap, > what? Ed Daw and I experimented with triggering LOFAR using VOEvents generated by LIGO during the run last August/September. We adopted the "likely galaxies" table. Given LOFAR's relatively huge field of view, I wrote some simple code to produce "optimum" observations (ie, including as many high-likelihood galaxies per pointing as possible). The whole exercise was relatively straightforward and seemed to work well. Of course, it would also be possible for us to take a probability map, cross correlate it with a galaxy catalogue, and generate our observations based on that. I guess an important question here is where the "astronomical insight" should be happening. For instance, I think it's a reasonable working assumption that LIGO systems know more about the physics of gravitational wave emitters than we do at LOFAR, so it makes sense for them to choose the most likely sources and just point us at them. I think that logic particularly apples when we're trying to do fast, automated followup: a simple message from an expert giving a list of possible targets is going to be easier to handle than a complex special-case algorithm for each potential source we might receive triggers from. On the other hand, I'd imagine there's another use case to consider: the human astronomer, examining the data at leisure, is presumably going to be interested in getting as close to the raw probability map as possible, so they can make their own decisions about which particular galaxies or other sources might be of most interest to them. Cheers, John From roy.williams at ligo.org Sat Jun 18 11:11:37 2011 From: roy.williams at ligo.org (Roy Williams) Date: Sat, 18 Jun 2011 11:11:37 -0700 Subject: new release 1.3 of Skyalert Message-ID: <4DFCEA59.9000605@ligo.org> Skyalert is a clearinghouse and repository of information about astronomical transients, each described by a collection of VOEvent packets that may be multiply authored. The components of Skyalert are: ? A web-based event broker, allowing subscription so that information about transients can be delivered to users and their telescopes immediately upon receipt. ? A web-based authoring system, so that authenticated users can inject events direct from automated discovery pipelines, or fill in web forms, that may be delivered rapidly to others. ? An event repository, storing all events that come through the broker, and allowing bulk queries and drill-down. ? A ?click or code? paradigm that allows people web based access and machines web service access. ? 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