52 citations · 331 across the 28 of their papers we have counts for
30 papers
Synchrotron self-Compton Reverse Shock in Energy-Injection and Radiative Scenarios
Fraija Nissim, Betancourt-Kamenetskaia Boris, Galván Antonio +1
Gamma-ray bursts (GRBs) are among the most energetic extragalactic transients, providing a unique laboratory to investigate the physical origin of the diverse morphologies observed…
Deep Newtonian Afterglows: Theoretical Light Curves for Quasi-spherical Outflows
Nissim Fraija, Boris Betancourt-Kamenetskaia, Antonio Galván +1
We investigate late-time gamma-ray burst (GRB) afterglows produced by quasi-spherical outflows propagating into a stratified circumburst medium during the deep Newtonian phase. Sub…
Long-Duration GRB 211211A: Internal Energy Dissipation Driven by a Long-Lived Magnetar
Nissim Fraija
The most promising candidate for short-duration gamma-ray bursts (GRBs) is the merger of two neutron stars (NSs), which produces kilonovae (KNe) in the aftermath. This merging can…
Gamma-Ray Bursts as an Independent High-Redshift Probe of Dark Energy
Maria Giovanna Dainotti, Aleksander Łukasz Lenart, Biagio De Simone +6
Testing the CDM model requires cosmological probes spanning the wide redshift interval between Type Ia Supernovae (SNe Ia, ) and the Cosmic Microwave Background (C…
GRB~250704B/EP250704a a Short Gamma-Ray Burst Powered by a Magnetar
Nissim Fraija, Antonio Galván, Boris Betancourt Kamenetskaia +1
GRB~250704B/EP250704a, identified as a short gamma-ray burst (sGRB), exhibited prolonged X-ray emission following the prompt phase and, in optical and infrared (IR) bands, an unusu…
Hadronic Clues in Quasars Caught by Fermi-LAT
Antonio Galván, Nissim Fraija, Edilberto Aguilar-Ruiz +3
This work explores whether hadronic processes could be responsible for the high-energy emission seen in quasars identified by the Large Area Telescope (LAT) instrument aboard the F…
Redshift Classification of Optical Gamma-Ray Bursts using Supervised Learning
Milind Sarkar, Maria Giovanna Dainotti, Nikita S. Khatiya +9
Modern satellite missions localize many gamma-ray bursts (GRBs), but spectroscopic redshifts remain scarce because rapid optical follow-up is often unavailable. Optical plateau cla…
Variation of Microphysical Parameters in Reverse-shock Scenario
Nissim Fraija, Boris Betancourt-Kamenetskaia, Antonio Galván +1
Gamma-ray bursts (GRBs), among the most compelling astrophysical phenomena, are potential candidates for exploring the evolution of energy distribution among magnetic fields and pa…
Magnetic Burial in Millisecond Magnetars and Late GRB Afterglow Signatures
Nissim Fraija, Cristian Giovanni Bernal, Antonio Galván +2
Millisecond magnetars, one of the potential candidates for the central engine of Gamma-ray bursts (GRBs), can experience significant magnetic field enhancement shortly after their…
A new binning method to choose a standard set of Quasars
Maria Giovanna Dainotti, Aleksander Lukasz Lenart, Mina Godsi Yengejeh +4
Although the Lambda Cold Dark Matter model is the most accredited cosmological model, information at intermediate redshifts (z) between type Ia Supernovae (z = 2.26) and the Cosmic…
Modeling Gamma-ray burst Afterglow observations with an Off-axis Jet emission
Nissim Fraija, Antonio Galvan-Gamez, Boris Betancourt Kamenetskaia +5
Gamma-ray bursts (GRBs) are fascinating extragalactic objects. They represent a fantastic opportunity to investigate unique properties not exhibited in other sources. Multi-wavelen…
Decelerated sub-relativistic material with energy Injection
B. Betancourt Kamenetskaia, N. Fraija, M. Dainotti +3
We investigate the evolution of the afterglow produced by the deceleration of the non-relativistic material due to its surroundings. The ejecta mass is launched into the circumstel…
Interplanetary magnetic flux rope observed at ground level by HAWC
S. Akiyama, R. Alfaro, C. Alvarez +59
We report the ground-level detection of a Galactic Cosmic-Ray (GCR) flux enhancement lasting 17 hr and associated with the passage of a magnetic flux rope (MFR) over the Ear…
GRB Fermi-LAT afterglows: explaining flares, breaks, and energetic photons
N. Fraija, T. Laskar, S. Dichiara +4
The Fermi-LAT collaboration presented the second gamma-ray burst (GRB) catalog covering its first 10 years of operations. A significant fraction of afterglow-phase light curves in…
Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium
N. Fraija, B. Betancourt Kamenetskaia, M. G. Dainotti +4
We present the afterglow light curves produced by the deceleration of the non-relativistic ejecta mass in a stratified circumstellar medium with a density profile $n(r)\propto r^{-…
Optical polarimetric and multiwavelength flaring activity of blazar 3C279
N. Fraija, E. Benítez, D. Hiriart +5
An exhaustive analysis of 9-year optical R-band photopolarimetric data of the flat-spectrum radio quasar 3C279 from 2008 February 27 to 2017 May 25 is presented, alongside with mul…
Late Central Engine Activity in GRB 180205A
R. L. Becerra, A. M. Watson, N. Fraija +16
We present optical photometry of the afterglow of the long GRB 180205A with the COATLI telescope from 217 seconds to about 5 days after the {\itshape Swift}/BAT trigger. We analyse…
A hypercritical accretion scenario in Central Compact Objects accompanied with an expected neutrino burst
N. Fraija, C. G. Bernal, G. Morales +1
The measurement of the period and period derivative, and the canonical model of dipole radiation have provided a method to estimate the low superficial magnetic fields in the so-ca…
The origin of the optical flashes: The case study of GRB 080319B and GRB 130427A
N. Fraija, P. Veres
Correlations between optical flashes and gamma-ray emissions in gamma-ray bursts have been searched in order to clarify the question whether these emissions occur at internal and/o…
The short GRB 170817A: Modelling the off-axis emission and implications on the ejecta magnetization
N. Fraija, F. De Colle, P. Veres +4
The short GRB 170817A, detected by the Fermi Gamma-ray Burst Monitor, orbiting satellites and ground-based telescopes, was the electromagnetic counterpart of a gravitational-wave t…
Long-term optical polarization variability and multiwavelength analysis of Blazar Mrk 421
Nissim Fraija, Erika Benítez, David Hiriart +8
The results of 8-year R-band photopolarimetric data of blazar Mrk 421 collected from February 2008 to May 2016 are presented, along with extensive multiwavelength observations cove…
Modeling the early afterglow in the short and hard GRB 090510
Nissim Fraija, William H. Lee, Peter Veres +1
The bright, short and hard GRB 090510 was detected by all instruments aboard Fermi and Swift satellites. The multiwavelength observations of this burst presented similar features w…
The GeV counterpart of VER J2019+407 in the northern shell of the supernova remnant G78.2+2.1 ( Cygni)
Nissim Fraija, Miguel Araya
Analysis of gamma-ray emission from the supernova remnant G78.2+2.1 ( Cygni) with 7.2 years of cumulative data from the Fermi-LAT telescope shows a distinct hard, bright and ext…
Modeling the early multiwavelength emission in GRB130427A
Nissim Fraija, William H. Lee, Péter Veres
One of the most powerful gamma-ray bursts, GRB 130427A was swiftly detected from GeV -rays to optical wavelengths. In the GeV band, the Large Area Telescope (LAT) on board the F…