GRB Temporal Analysis(GTA) Workshop:

Welcome & Overview

Mike StamatikosCenter for Cosmology and Astro-Particle Physics

OSU Physics Research Building (PRB 4138)Columbus, OH USAJune 28-30, 2010

Welcome to Columbus!

GTA Workshop: Logistics

• Workshop website talk repository (USB Memory Stick):

http://www.ccapp.osu.edu/workshops/GRB/workshop.html

• Please see Lisa Krehnovi for registration materials, e.g. name tag, wireless internet instructions, updated agenda, etc.

• Daily Coffee Breaks & Lunches† will

be in lobby area outside PRB 4138.

• Workshop Dinner‡ will be on Tuesday

(06/29/10) at Bistro 2110.

†Need to get a head count for Wednesday (06/30/10).‡Need to get a head count for Tuesday (06/29/10).

GRB Temporal Analysis Consortium† (GTAC)

1. Narayan Bhat (UAH)

2. Chuck Dermer (NRL)

3. Kalvir Dhuga (GW)

4. Chris Fryer (LANL)

5. Jon Hakkila (COFC)*

6. Glen MacLachlan (GW)

7. Raffaella Margutti (INAF-OAB)

8. Kohta Murase (OSU)**

9. Jay Norris (U Denver)*

10. Brad Peterson (OSU)

11. Taka Sakamoto (NASA-GSFC)*

12. Jeff Scargle (NASA-AMES)*

13. Mike Stamatikos (OSU/NASA-GSFC)

14. Todd Thompson (OSU)

15. Kenji Toma (PSU)*

16. Tilan Ukwatta (GW)

† Tentative * Not able to participate in this workshop. ** Will join in on Wednesday (06/30/10).

GTAC: Vision & Mission Statement

• To form a team of theorists and experimentalists that will strategically focus on the temporal analysis of light curves from GRBs.

• To build a new methodological paradigm in the determination of temporal observables and explore their theoretical implications.

• To determine courses of action to help guide new:

1. theoretical investigations,

2. development of analysis techniques, and

3. plans for future satellite missions.

GTA Workshop: Major Themes

• Major GRB temporal analysis topics will include:

1. intrinsic variability timescale (via wavelets, FFT, etc.)

2. spectral lag (via pulse-fit paradigm, CCF, etc.)

• These observables in principle can be directly extracted from GRB data and may shed light upon currently untenable aspects such as:

1. the progenitor(s), 2. central engine, 3. Bulk Lorentz Factor ( Bulk)4. short/long class discrimination.5. Empirical redshift estimates

GTA Workshop: Key Goals

• Various methodologies will be compared/contrasted to:

1. define the state of the art,

2. facilitate the identification of fundamental open questions associated with the temporal characteristics of GRBs, and assign key task to

3. draft a collaborative white paper outlining a unified paradigm for the determination of variability and lags, with possible implications for the minimum Bulk Lorentz factor, short/long class discrimination and progenitor/central engine models.

After four decades of observations, several open questions still remain ...

Open Questions #1: Variability Timescale

• What is the best way to define tv?

• Is there an inconsistency between tv of BATSE GRBs and those from Swift/Fermi?

• Does tv evolve with time?

• Are there variability classes amongst GRBs?

• Since flares are a form of late time variability, what are their temporal properties? Are they time dependent? Does their total energy correlate with other observables from prompt emission such as duration, Eiso, etc.?

• What aspects of GRB phenomenology can be tied to the central engine? Is tv correlated with the intrinsic microphysics?

• Can tv be used to discriminate between progenitor models?

Open Questions #2: Bulk Lorentz Factor

• In conjunction with the observed high-energy -ray emission from Fermi, tv effects the

calculation of Bulk. What are the implications of Bulk~1000 for leptonic/hadronic models?

• Does Bulk evolve with time throughout emission?

• How does time-averaged Bulk correlate with Eiso, Etot, X-ray plateau duration, or total energy in flares?

Open Questions #3: Spectral Lags

• What is the physical source of the spectral lag?

• Is there something we can learn about the central engine or is the lag a mechanism of the emission of radiation?

• Which is the best method to measure the spectral lag?

• Does spectral lag change throughout prompt emission?

• What is the physical explanation behind the lag-luminosity relation (LLR)?

• What are the implications of the presence of a LLR both in x-ray flares and in the prompt -ray pulses?

• Is there an intrinsic difference between the spectral lags of long and short GRBs or is it a selection effect?

GTA Workshop: Scientific Program

• This will be a "think tank" environment, with ~20+10 minute talks on Day 1 that will set the stage for open discussion, strategy & break-out sessions on Days 2-3.

• The agenda will be flexible and allow for extended Q&A sessions in the context of presentations. Time won’t be kept in the traditional sense, but we don’t want to give out any Fidel Castro Awards either!

• Therefore, the scientific agenda

should be considered a guide

rather than a strict schedule.

DAY 01: Monday (June 28, 2010) – PRB 4138

8:30 - 8:45 AM Shuttle transport from University Plaza Hotel to Physics Research Building (PRB)

8:45 - 9:00 AM Coffee and Registration Lisa Krehnovi

9:00 - 9:30 AM Welcome & Overview Mike Stamatikos

9:30 - 10:00 AM Variability in Gamma-Ray Sources: Bulk Lorentz Factors, Beaming Factors, and Energetics Chuck Dermer

10:00 - 10:30 AM Environments around Collapsar and DNS GRBs Chris Fryer

10:30 – 11:00 AM Coffee Break

11:00 - 11:30 AM Overview of Magnetars Todd Thompson

11:30 - 12:00 PM Some Temporal and spectral studies of a few strong GBM GRB light curves Narayan Bhat

12:00 – 12:30 PM BAT Spectral Lags: Average, Time resolved & The Lag-Luminosity Relation Mike Stamatikos

12:30 – 2:00 PM Lunch

2:00 – 2:30 PM Measuring Time Delays in Reverberation Studies of Active Galactic Nuclei Brad Peterson

2:30 – 3:00 PM Timing in the time domain Raffaella Margutti

3:00 – 3:30 PM A New Frequency-Luminosity Relation for Long GRBs Tilan Ukwatta

3:30 - 4:00 PM Coffee Break

4:00 – 4:30 PM A Wavelet Based Estimation of the Hurst Exponent from Long GRBs Glen MacLachlan

4:30 - 5:30 PM Strategy Session: Identifying Open Questions All

5:30 - 5:45 PM Shuttle transport from Physics Research Building (PRB) to University Plaza Hotel

GTA Workshop: Scientific Program

8:30 - 8:45 AM Shuttle transport from University Plaza Hotel to Physics Research Building (PRB)

8:45 - 9:00 AM Coffee and Registration Lisa Krehnovi

9:00 - 9:30 AM Summary of Day 01 Mike Stamatikos

9:30 - 10:30 AM Strategy Session: Developing Working Groups & Action Items All

10:30 – 11:00 AM Coffee Break

11:00 – 12:30 PM Breakout Session: Theory & Experiment Working Groups

12:30 – 2:00 PM Lunch

2:00 – 3:30 PM Breakout Session: Theory & Experiment Working Groups

3:30 - 4:00 PM Coffee Break

4:00 - 5:15 PM Working Group Summary: Plan for Future Work All

5:30 - 7:30 PM Workshop Dinner† (Bistro 2110)

7:30 - 7:45 PM Shuttle transport from Physics Research Building (PRB) to University Plaza Hotel

DAY 02: Tuesday (June 29, 2010) – PRB 4138

GTA Workshop: Scientific Program

†Need to get a head count.

8:30 - 8:45 AM Shuttle transport from University Plaza Hotel to Physics Research Building (PRB)

8:45 - 9:00 AM Coffee and Registration Lisa Krehnovi

9:00 - 9:30 AM Summary of Day 02 Mike Stamatikos

9:30 - 10:30 AM Strategy Session: Outline for White Paper All

10:30 – 11:00 AM Coffee Break

11:00 – 11:45 PM Strategy Session: Future Analysis Tasks and Action Items All

11:45 - 12:00 PM Closing Remarks: End of Workshop Mike Stamatikos

12:00 PM Lunch‡

DAY 03: Wednesday† (June 30, 2010) – PRB 4138

GTA Workshop: Scientific Program

†Make sure to check out and bring luggage with you to OSU. We can facilitate scheduling taxi service to CMH.‡Need to get a head count.