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Bridging the gap between the prompt and the afterglow emission: the lag-luminosity relation…

Bridging the gap between the prompt and the afterglow emission: the lag-luminosity relation…. R. Margutti Harvard University. LOS ALAMOS 2011. Where do we stand. Gamma-ray Prompt. X-ray Flares. Log(Flux ). t -1. Is there any physical link between a prompt pulse and an X-ray flare?.

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Bridging the gap between the prompt and the afterglow emission: the lag-luminosity relation…

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  1. Bridging the gap between the prompt and the afterglow emission: the lag-luminosity relation… R. Margutti Harvard University LOS ALAMOS 2011

  2. Where do we stand Gamma-ray Prompt X-ray Flares Log(Flux) t-1 Is there any physical link between a prompt pulse and an X-ray flare? Swift Steep Decay Shallow Decay Normal Decay Log(Time) 10-100 s 102-103s ~104s

  3. Gamma-ray Prompt Temporal Properties 1.Pulse Asymmetry 2.Fast rise- Exponential decay Log(Flux) X-ray Flares Spectral Properties 1.Band spectral energy distribution 2.Peak energy evolution with time Ep(t) 3. Ep(t)-Liso(t) 4. Lag-Luminosity relation Log(Time) Margutti et al., 2010,MNRAS, 406, 2149 Flares are softer and less energetic time-stretched versions of a prompt pulse

  4. Lag-Luminosity Lag PROMPT LONG!!!! FLARES Margutti et al., 2010,MNRAS, 406, 2149

  5. Short GRBs ??!!?? 051221A 060801 050724 100117A 070724A 071227 050724 LOS ALAMOS 2011

  6. LOS ALAMOS 2011

  7. Different tools Different definitions (e.g. pulse-peak lag vs. CCF lag) PULSE property vs. Time-averaged measurements Strongly dependent on the definition of the energy bands used Using rest-frame defined energy bands is enough? …No Homogeneity… LOS ALAMOS 2011

  8. Different tools Different definitions (e.g. pulse-peak lag vs. CCF lag) PULSE property vs. Time-averaged measurements Strongly dependent on the definition of the energy bands used Using rest-frame defined energy bands is enough? No Homogeneity + Difficult to model LOS ALAMOS 2011

  9. Progress requires: Homogenous analysis of a statistically significant number of GRBs Step back to the analysis of more basic effects that are known to contribute to the lag measure to understand how each of them is correlated to the final lag measure Time resolved approach to determine a MAP of the obs. properties of GRBswith time. LOS ALAMOS 2011

  10. Observables map: LOS ALAMOS 2011

  11. Observables map: Epeak (t) alpha (t) beta (t) Lag (t) Variability (t) Pulses properties(t) Pulses properties (E) ?? ?? ?? LOS ALAMOS 2011

  12. The GTAC MANIFESTO 1) Selection of a GRB 2) Production of a MAP of properties 3) Writing of a document Galaxy NNN 050822 ACT as a TEAM Useful for FUNDING (we have something to show..) Gamma-Ray Burst (GRB050822) LOS ALAMOS 2011

  13. 061121 WISH LIST: GRB detected by Swift- Fermi Prompt emission seen by XRT Prompt emission see by UVOT Bright Known z …good for GBM-BAT cross calibration… LOS ALAMOS 2011

  14. Raffaella: Variability Time scale of BAT; XRT expertise (XRT+BAT spectral fits; pulse properties in the X-ray regime) Mike: Time-resolved lag using the CCF John: Prompt Pulse properties List of people to complete…. LOS ALAMOS 2011

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