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Rubina Kotak (QUB), Martin Ward (Durham)

Synergies between PS1-transients KPs and the LOFAR-transients KSP. lofar.org. Rubina Kotak (QUB), Martin Ward (Durham). PS1 – LOFAR transients. Focus here is on complementarity / possible exchange of information of transient events (only) between PS1 and LOFAR.

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Rubina Kotak (QUB), Martin Ward (Durham)

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  1. Synergies between PS1-transients KPs and the LOFAR-transients KSP lofar.org Rubina Kotak (QUB), Martin Ward (Durham)

  2. PS1 – LOFAR transients Focus here is on complementarity / possible exchange of information of transient events (only) between PS1 and LOFAR. MoU between LOFAR continuum surveys (LOFAR Surveys Key Science Projects) and PS1SC well under way => not discussed here.

  3. Transientsciencewith PS1+LOFAR • Large collecting area + field-of-view • Both deep and wide (“all accessible sky”) surveys • Timescales: LOFAR: nano sec – years PS1: hours - years • Substantial overlap in (known) types of transients e.g. jet sources (AGN, GRBs, micro-quasars etc.), SNe, flare stars, planets etc. • Potential to find rare / new types of transients

  4. Possible first step: Ingest catalogue of LOFAR transients into e.g. QUB transient classifier (positional info. + flux density + epoch) Correlationwithcataloguesofknownsources e.g. SDSS, NED (Probabilistic classification already being done for finding PS1 candidate SNe) Known / new optical counterpart Provide catalogue of upper limits? Classification of transients from combined information VO event?

  5. Example of a joint project: highly variable extragalactic transients/flaresthese are likely to be quite rare events, but no all-sky statistics available yet…

  6. Jet Physics: constraining the models • About 40 AGN, mostly Blazars, are detected at TeV energies, eg. using Whipple, CAT, HEGRA, H.E.S.S, MAGIC and VERITAS • Some spectacular cases eg. PKS2155-30 which has significant variability on minutes – cannot be ct light crossing distance across BH • Fundamental information about origin and evolution of jets with gamma > 50 (link with GRBs) • LOFAR (radio) plus PanSTARRS (optical) plus TeV, gives SED needed to unravel the problem

  7. CoCompact Source Variabilityt

  8. CoSED of Blazar during a flare(see recent review by Aller, Hughes and Aller 2010)tA

  9. SEDs of TeV detected Blazars

  10. Open Issues • Any flexibility in observing / strategy? e.g. co-ordination of selected fields targeted? (Note: PS1 fields + observing strategy ~ fixed for various KPs) • Relevant timescales (need for quasi-synchronization?) • Mechanism (and format) for exchange of information – who triggers who to focus on interesting events? • Follow-up observations on medium sized telescopes (ToO programmes)

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