1. R. Margutti Harvard University LOS ALAMOS 2011

2. Where do we stand Log(Time) Log(Flux) Gamma-ray Prompt X-ray Flares Swift Steep Decay Shallow Decay Normal Decay 10-100 s10 2 -10 3 s~10 4 s t -1 Is there any physical link between a prompt pulse and an X-ray flare?

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

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

5. LOS ALAMOS 2011 060801 051221A 050724 100117A 050724 070724A 071227

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?

8. LOS ALAMOS 2011 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?

9. LOS ALAMOS 2011 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 GRBs with time.

10. LOS ALAMOS 2011

11. Epeak (t) alpha (t) beta (t) Lag (t) Variability (t) Pulses properties(t) Pulses properties (E) ??

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

13. LOS ALAMOS 2011 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…

14. LOS ALAMOS 2011 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….