Conveners
Gamma ray bursts relationships in multi-wavenths as cosmological tools: Thursday block 1
- Gibran Morales (IRyA-UNAM)
- Yong-Feng Huang (Nanjing University)
- Maria Dainotti (National Astronomical Observatory of Japan)
Gamma ray bursts relationships in multi-wavenths as cosmological tools: Thursday block 2
- Gibran Morales (IRyA-UNAM)
- Maria Dainotti (National Astronomical Observatory of Japan)
- Yong-Feng Huang (Nanjing University)
Gamma ray bursts relationships in multi-wavenths as cosmological tools: Friday block 1
- Gibran Morales (IRyA-UNAM)
- Maria Dainotti (National Astronomical Observatory of Japan)
- Maria Dainotti ()
- Yong-Feng Huang (Nanjing University)
Gamma ray bursts relationships in multi-wavenths as cosmological tools: Friday block 2
- Yong-Feng Huang (Nanjing University)
- Gibran Morales (IRyA-UNAM)
- Maria Dainotti ()
- Maria Dainotti (National Astronomical Observatory of Japan)
Description
Gamma Ray Bursts (GRBs) are fascinating events due to the fact that they are observed at very large redshifts, up to redshift 9. Thus, in principle they can be excellent probes of star formation, to track the evolution history of the universe and to be useful for deriving cosmological parameters.
The problem is that GRBs do not seem to be standard candles with their energetic and luminosities spanning over several orders of magnitude.
Thus, the hunt for reliable relationships in multi-wavenths is the step necessary to use them as cosmological tools.
In this sessions we will investigate the current open problems and to which extent selection biases and cosmological evolution affects the application of GRBs as standard candles.
We will also discuss how much these probes can be used together with SNe Ia and other high redshift probes as quasars and what are the best method for calibrations.
I will review the recent developments of GR MHD numerical simulations of GRB central engines.
I will also present some multi-messenger observational challenges still unsolved by these models.
In this talk, I will highlight some of the recent and most exciting theoretical and observational development in gamma-ray bursts (GRBs) that occured in the past decade, alongside some new open questions that I anticipate would be at the forefront of GRB reserch in the next decade. In particular, I will discuss our current state of knowledge on: (1) jet structure, which became evident...
Gamma-ray bursts (GRBs) are one of the most energetic explosions known in the Universe. Even though many GRBs have been observed since their discovery more than 50 years ago, and despite the success of the “fireball” model, there are still many open questions and unexplained observations. The origin of the plateau phase observed in the early X-ray light curve of GRBs (up to thousands of...
Gamma-ray bursts observed in high energies allow the investigation of the emission processes of these still puzzling events. Here, we investigate the peculiar GRB 090510, a short GRB with an indication of plateau emission observed by the Fermi-LAT within the context of general relativistic magnetohydrodynamic code (HARM) to infer the jet opening angle, the energetics, the Lorentz Gamma factor,...
Gamma-Ray Bursts (GRBs) are very energetic cosmological transients. Long GRBs are usually associated with Type Ib/c Supernovae (SNe), and we refer to them as GRB-SNe. Since the associated SN for a given GRB is observed only at low redshift, a possible selection effect exists when we consider intrinsically faint sources which cannot be observed at high redshift. Thus, it is important to explore...
We collected the optical light curve data of 227 gamma-ray bursts (GRBs) observed with the TAROT, COATLI, and RATIR telescopes. These consist of 133 detections and 94 upper limits. We constructed average light curves in the observer and rest frames in both X-rays (from {\itshape Swift}/XRT) and in the optical. Our analysis focused on investigating the observational and intrinsic properties of...
We present a correlation observed in the afterglows of long duration Gamma-ray Bursts (GRBs) between the initial luminosity and average afterglow decay rate. We will show how this correlation, initially found at optical and X-ray wavelengths, is observed across the electromagnetic spectrum from the GeV to the radio. This correlation does not depend on the presence of specific light curve...
Cosmological models and their parameters are widely debated, especially about whether the current discrepancy between the values of the Hubble constant, H 0, obtained by Type Ia supernovae (SNe Ia) and the Planck data from the cosmic microwave background radiation could be alleviated when alternative cosmological models are considered. Thus, combining high-redshift probes, such as gamma-ray...
Low-redshift observations play a crucial role in constraining cosmological parameters but current data on baryon acoustic oscillations and Supernovae of Type Ia (SNIa) cover up to $z\sim2.5$. Gamma-Ray Bursts (GRBs) stand out as one of the most promising observables as they exhibit characteristics that suggest they are potentially standardizable candles. This allows their use to extend the...
We present the largest optical photometry compilation of Gamma-Ray Bursts (GRBs) with measured redshifts ($z$). Our dataset includes 64813 observations of 535 events (including upper limits) from 28 February 1997 to 18 August 2023. We introduce grbLC, a user-friendly web tool for visualising photometry, coordinates, redshift, host-galaxy extinction, and spectral indices for each event in our...
The huge luminosity, the redshift distribution extending at least up to z∼10 and the association with the explosive death of very massive stars make long GRBs (i.e., those lasting up to a few minutes) potentially extremely powerful probes for shedding light on main open issues in our understanding of the early Universe: star formation rate evolution up to the first generation of stars...
Despite decades of research, cosmology still lacks reliable probes to study the Universe in the intermediate redshift regime (from $ z = 1 $ up to $ z = 1100 $). Very few astronomical objects observed at such high distances can be standardized. We present the case of Gamma-Ray Bursts (GRBs, $ z < 9.4 $). For these sources, the observational luminosity distance can be derived using an empirical...
