The intensity-tracking pattern in GRB prompt spectra divides into three subclasses: aligned peaks (Type I), Ep before flux (Type II, dominant), and Ep after flux (Type III).
The Multi-Mission Maximum Likelihood framework (3ML)
10 Pith papers cite this work. Polarity classification is still indexing.
10
Pith papers citing it
abstract
Astrophysical sources are now observed by many different instruments at different wavelengths, from radio to high-energy gamma-rays, with an unprecedented quality. Putting all these data together to form a coherent view, however, is a very difficult task. Each instrument has its own data format, software and analysis procedure, which are difficult to combine. It is for example very challenging to perform a broadband fit of the energy spectrum of the source. The Multi-Mission Maximum Likelihood framework (3ML) aims to solve this issue, providing a common framework which allows for a coherent modeling of sources using all the available data, independent of their origin. At the same time, thanks to its architecture based on plug-ins, 3ML uses the existing official software of each instrument for the corresponding data in a way which is transparent to the user. 3ML is based on the likelihood formalism, in which a model summarizing our knowledge about a particular region of the sky is convolved with the instrument response and compared to the corresponding data. The user can choose between a frequentist analysis, and a Bayesian analysis. In the former, parameters of the model are optimized in order to obtain the best match to the data (i.e., the maximum of the likelihood). In the latter, the priors specified by the user are used to build the posterior distribution, which is then sampled with Markov Chain Monte Carlo or Multinest. Our implementation of this idea is very flexible, allowing the study of point sources as well as extended sources with arbitrary spectra. We will review the problem we aim to solve, the 3ML concepts and its innovative potential.
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use method 1representative citing papers
CNN emulator for decaying magnetic field fast-cooling synchrotron spectra is trained on synthetic data and used in Bayesian fits to GRB 231020A, favoring the decaying-field model over the standard version.
Optically thin inverse Compton scattering in GRB fireballs yields a positive E_peak-α correlation with alpha evolving from >+0.5 to <-0.67, proposed as a diagnostic signature for the prompt emission mechanism.
Decaying magnetic fields in fast-cooling synchrotron emission partially harden the low-energy index but still produce a distribution centered near α ≈ −1.5, falling short of reproducing the observed GBM catalog at the population level.
HAWC observations yield no TeV detections from spider MSPs, with upper limits indicating they are unlikely to contribute substantially to Galactic diffuse emission at TeV energies.
No photon-ALP conversion signal found in HAWC data from M87, producing competitive constraints excluding ALP masses of 10^{-8} to 10^{-6} eV for couplings above 5×10^{-12} GeV^{-1}.
Spectro-polarimetric analysis of GRB 220107A reveals spectral softening between episodes and low overall polarization, with a marginal signal in the second episode, illustrating the potential of time-resolved observations to constrain GRB prompt emission models.
No dark matter annihilation signal is detected from dwarf galaxies; upper limits on the velocity-weighted cross-section are set at order 10^{-23} cm^3 s^{-1} for DM masses 1-10^4 TeV.
Multi-instrument analysis interprets HESS J1857+026 as a pulsar wind nebula with age 16-21 kyr and B-field 0.4-1.6 μG, plus possible hadronic emission below 10 GeV and suppressed local diffusion.
Multi-wavelength analysis of GRB 140304A at z=5.282 shows hard-to-soft spectral evolution and linked flares in different wavelengths produced by synchrotron radiation in accelerating regions.
citing papers explorer
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Three Subclasses of the Intensity-tracking Pattern in Gamma-Ray Burst Spectral Evolution
The intensity-tracking pattern in GRB prompt spectra divides into three subclasses: aligned peaks (Type I), Ep before flux (Type II, dominant), and Ep after flux (Type III).
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Modeling Gamma-Ray Burst Spectra with Convolutional Neural Networks: Fast-Cooling Synchrotron Emission in a Decaying Magnetic Field
CNN emulator for decaying magnetic field fast-cooling synchrotron spectra is trained on synthetic data and used in Bayesian fits to GRB 231020A, favoring the decaying-field model over the standard version.
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$E_{\rm peak}$-$\alpha$ Correlation in Time Resolved GRB Spectra: A Bottom-Up Approach with Optically Thin Inverse Compton Scattering Model
Optically thin inverse Compton scattering in GRB fireballs yields a positive E_peak-α correlation with alpha evolving from >+0.5 to <-0.67, proposed as a diagnostic signature for the prompt emission mechanism.
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Fast-Cooling Synchrotron in Decaying Magnetic Fields: Implications for the GRB Spectral Distribution
Decaying magnetic fields in fast-cooling synchrotron emission partially harden the low-energy index but still produce a distribution centered near α ≈ −1.5, falling short of reproducing the observed GBM catalog at the population level.
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Search for TeV emission from spider millisecond pulsars with HAWC
HAWC observations yield no TeV detections from spider MSPs, with upper limits indicating they are unlikely to contribute substantially to Galactic diffuse emission at TeV energies.
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Constraints on axion-like particles from ultra-high-energy observations of M87 with the HAWC observatory
No photon-ALP conversion signal found in HAWC data from M87, producing competitive constraints excluding ALP masses of 10^{-8} to 10^{-6} eV for couplings above 5×10^{-12} GeV^{-1}.
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Episode-wise spectro-polarimetry of GRB 220107A: Testing the hypothesis of evolving radiation mechanisms
Spectro-polarimetric analysis of GRB 220107A reveals spectral softening between episodes and low overall polarization, with a marginal signal in the second episode, illustrating the potential of time-resolved observations to constrain GRB prompt emission models.
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Improved Heavy Dark Matter Annihilation Search from Dwarf Galaxies with HAWC
No dark matter annihilation signal is detected from dwarf galaxies; upper limits on the velocity-weighted cross-section are set at order 10^{-23} cm^3 s^{-1} for DM masses 1-10^4 TeV.
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A Multiwavelength Interpretation of HESS J1857+026 Emission Using the Fermi-LAT, VERITAS, and HAWC Observatories
Multi-instrument analysis interprets HESS J1857+026 as a pulsar wind nebula with age 16-21 kyr and B-field 0.4-1.6 μG, plus possible hadronic emission below 10 GeV and suppressed local diffusion.
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High-redshift GRB 140304A at z = 5.282 with flaring activity: A multi-wavelength study
Multi-wavelength analysis of GRB 140304A at z=5.282 shows hard-to-soft spectral evolution and linked flares in different wavelengths produced by synchrotron radiation in accelerating regions.