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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?. - PowerPoint PPT Presentation
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Bridging the gap between the prompt and the afterglow emission:
the lag-luminosity relation…
R. MarguttiHarvard
UniversityLOS ALAMOS 2011
Where do we stand
Log(Time)
Log(
Flux
)Gamma-rayPrompt
X-ray Flares
SwiftSteep Decay
Shallow Decay
Normal Decay
10-100 s102-103 s ~104s
t-1Is there any
physical link
between a prompt
pulse and an X-ray
flare?
Log(Time)
Log(
Flux
) Gamma-rayPrompt
X-ray Flares
Flares are softer and less energetic time-stretched versions of a prompt pulse
Margutti et al., 2010,MNRAS, 406, 2149
Temporal Properties1.Pulse Asymmetry
2.Fast rise- Exponential decay
Spectral Properties1.Band spectral energy distribution
2.Peak energy evolution with time Ep(t)3. Ep(t)-Liso(t)
4. Lag-Luminosity relation
Lag-Luminosity
PROMPT
€
L(0.3−10keV ) ∝ tlag−0.95±0.23
FLARES
Lag
Margutti et al., 2010,MNRAS, 406, 2149
LONG!!!!
LOS ALAMOS 2011
060801051221A
050724
100117A
050724
070724A
071227
Short GRBs ??!!??
LOS ALAMOS 2011
LOS ALAMOS 2011
Different toolsDifferent definitions (e.g. pulse-peak lag vs. CCF lag)
…No Homogeneity…
PULSE property vs. Time-averaged measurements
Strongly dependent on the definition of the energy bands used
Using rest-frame defined energy bands is enough?
LOS ALAMOS 2011
Different toolsDifferent definitions (e.g. pulse-peak lag vs. CCF lag)
No Homogeneity + Difficult to model
PULSE property vs. Time-averaged measurements
Strongly dependent on the definition of the energy bands used
Using rest-frame defined energy bands is enough?
LOS ALAMOS 2011
Progress requires:Homogenous analysis of a statistically significant number of GRBsStep 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 measureTime resolved approach to determine a MAP of the obs. properties of GRBs with time.
LOS ALAMOS 2011
Observables map:
LOS ALAMOS 2011
Observables map:
Epeak (t)alpha (t)beta (t) Lag (t)Variability (t)Pulses properties(t)Pulses properties (E)??????
LOS ALAMOS 2011
The GTAC MANIFESTO
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 TEAMUseful for FUNDING(we have
something to show..)
LOS ALAMOS 2011
061121WISH LIST:GRB detected by Swift- FermiPrompt emission seen by XRTPrompt emission see by UVOTBrightKnown z…good for GBM-BAT cross calibration…
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 CCFJohn: Prompt Pulse properties
List of people to complete….
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