Publications (31)
Design and preliminary performance study of the broad-band spectrometer detector for POLAR-2
Jian-Chao Sun, Jiang He, Shuang-Nan Zhang +46
POLAR-2, the successor of the POLAR experiment aboard China's Tiangong-2 space lab, is set to be deployed on the China Space Station. The POLAR-2 mission aims to conducting high-pr…
Design and Performance of a Universal SiPM Readout System for X- and Gamma-Ray Missions
Merlin Kole, Nicolas De Angelis, Nicolas Produit +15
The advent of both multi-messenger and time-domain astrophysics over the last decade has seen a large interest in the development of small-scale, cheap, and robust gamma-ray detect…
In-Orbit Instrument Performance Study and Calibration for POLAR Polarization Measurements
Zhengheng Li, Merlin Kole, Jianchao Sun +30
POLAR is a compact space-borne detector designed to perform reliable measurements of the polarization for transient sources like Gamma-Ray Bursts in the energy range 50-500keV. The…
Perspectives on Gamma-Ray Burst Physics and Cosmology with Next Generation Facilities
Weimin Yuan, Lorenzo Amati, John K. Cannizzo +10
High-redshift Gamma-Ray Bursts (GRBs) beyond redshift are potentially powerful tools to probe the distant early Universe. Their detections in large numbers and at truly hig…
Expected performance of a hard X-ray polarimeter (POLAR) by Monte Carlo Simulation
Shaolin Xiong, Nicolas Produit, Bobing Wu
Polarization measurements of the prompt emission in Gamma-ray Bursts (GRBs) can provide diagnostic information for understanding the nature of the central engine. POLAR is a compac…
Gamma-Ray Polarimetry of the Crab Pulsar Observed by POLAR
Han-Cheng Li, Nicolas Produit, Shuang-Nan Zhang +15
The X/ ray polarimetry of the Crab pulsar/nebula is believed to hold crucial information on their emission models. In the past, several missions have shown evidence of polarize…
In-flight energy calibration of the space-borne Compton polarimeter POLAR
Hualin Xiao, Wojtek Hajdas, Bobing Wu +39
POLAR is a compact wide-field space-borne detector for precise measurements of the linear polarisation of hard X-rays emitted by transient sources in the energy range from 50 keV t…
Prospects of Prompt Gamma-Ray Burst Polarimetry with POLAR-2
Ramandeep Gill, Jiang He, Jonathan Granot +6
The dominant radiation mechanism that powers the prompt -ray emission in gamma-ray bursts (GRBs) remains poorly understood. High quality, time- and energy-resolved linear polar…
Adding Gamma-ray Polarimetry to the Multi-Messenger Era
Merlin Kole, Francesco Iacovelli, Michele Mancarella +1
The last decade has seen the emergence of two new fields within astrophysics: gamma ray polarimetry and GW astronomy. The former, which aims to measure the polarization of gamma ra…
Probing Neural Networks for the Gamma/Hadron Separation of the Cherenkov Telescope Array
Etienne Lyard, Roland Walter, Vitalii Sliusar +1
We compared convolutional neural networks to the classical boosted decision trees for the separation of atmospheric particle showers generated by gamma rays from the particle-induc…
Study of Lorentz violation in INTEGRAL Gamma-Ray Bursts
Raphael Lamon, Nicolas Produit, Frank Steiner
We search for possible time lags caused by quantum gravitational (QG) effects using gamma-ray bursts (GRBs) detected by INTEGRAL. The advantage of this satellite is that we have at…
Measuring the Cosmic X-ray Background accurately
Hancheng Li, Roland Walter, Nicolas Produit +1
Synthesis models of the diffuse Cosmic X-ray Background (CXB) suggest that it can be resolved into discrete sources, primarily Active Galactic Nuclei (AGNs). Measuring the CXB accu…
Hard X-ray flares in IGR J08408-4503 unveil clumpy stellar winds
Jean-Christophe Leyder, Roland Walter, Michalis Lazos +2
Context : A 1000-s flare from a new hard X-ray transient, IGR J08408-4503, was observed by INTEGRAL on May 15, 2006 during the real-time routine monitoring of IBIS/ISGRI images per…
Energy-dependent polarization of Gamma-Ray Bursts' prompt emission with the POLAR and POLAR-2 instruments
Nicolas De Angelis, J. Michael Burgess, Franck Cadoux +10
Gamma-Ray Bursts are among the most powerful events in the Universe. Despite half a century of observations of these transient sources, many open questions remain about their natur…
Astro2020 White Paper State of the Profession: Intensity Interferometry
David B. Kieda, Gisela Anton, Anastasia Barbano +14
Recent advances in telescope design, photodetector efficiency, and high-speed electronic data recording and synchronization have created the observational capability to achieve unp…
Gamma-Ray Burst Polarimetry with the POLAR and POLAR-2 missions
Nicolas De Angelis, Philipp Azzarello, Franck Cadoux +15
Gamma-Ray Bursts are among the most powerful and violent events in the Universe. Despite over half a century of observations of these transient sources, many open questions remain…
Measuring the Cosmic X-ray Background accurately
Hancheng Li, Nicolas Produit, Roland Walter
Measuring the Cosmic X-ray Background (CXB) is a key to understand the Active Galactic Nuclei population, their absorption distribution and their average spectra. However, hard X-r…
Synchrotron polarization of a hybrid distribution of relativistic thermal and nonthermal electrons in GRB prompt emission
Kangfa Cheng, Jirong Mao, Xiaohong Zhao +4
Synchrotron polarization of relativistic nonthermal electrons in gamma-ray bursts (GRBs) has been widely studied. However, recent numerical simulations of relativistic shocks and m…
Exploiting light coherence in astrophysics
Vitalii Sliusar, Domenico Della Volpe, Benjamin Garcia +7
The Hanbury Brown-Twiss (HBT) effect, discovered in the 1950s and further developed in the 1960s, was originally used to estimate stellar angular diameters through intensity correl…
Phase-resolved gamma-ray spectroscopy of the Crab pulsar observed by POLAR
Han-Cheng Li, Neal Gauvin, Ming-Yu Ge +15
The POLAR detector is a space based Gamma-Ray Burst (GRB) polarimeter sensitive in the 15-500 keV energy range. Apart from its main scientific goal as a Gamma-Ray Burst polarimeter…
Probing Stellar Kinematics with the Time-Asymmetric Hanbury Brown and Twiss Effect
Lucijana Stanic, Ivan Cardea, Edoardo Charbon +11
Intensity interferometry (II) offers a powerful means to observe stellar objects with a high resolution. In this work, we demonstrate that II can also probe internal stellar kinema…
Detailed polarization measurements of the prompt emission of five Gamma-Ray Bursts
Shuang-Nan Zhang, Merlin Kole, Tian-Wei Bao +37
Gamma-ray bursts are the strongest explosions in the Universe since the Big Bang, believed to be produced either in forming black holes at the end of massive star evolution or merg…
Response of the first POLAR-2 Prototype to Polarized Beams
Merlin Kole, Nicolas de Angelis, Ana Bacelj +15
POLAR-2 is a dedicated gamma-ray polarimeter currently foreseen to be launched towards the China Space Station around 2027. The design of the detector is based on the legacy of its…
POLAR-2 -- Latest Developments of the Next Generation GRB Polarimeter
Johannes Hulsman, Philipp Azzarello, Joerg Bayer +20
Gamma-Ray Bursts (GRBs) are among the most energetic events in the Universe. Despite over 50 years of research and measurements their prompt emission remains poorly understood, wit…
Systematic Search for Short-transients and Pulsation Events from INTEGRAL Survey Data
Ken Ebisawa, Peter Kretschmar, Nami Mowlavi +9
The imaging instruments on board INTEGRAL have wide fields of view and high time resolution. Therefore, they are ideal instruments to search for pulsating sources and/or transient…
Gamma-Ray Polarimetry
Denis Bernard, Tanmoy Chattopadhyay, Fabian Kislat +1
While the scientific potential of high-energy X-ray and gamma-ray polarimetry has long been recognized, measuring the polarization of high-energy photons is challenging. To date, t…
POLAR-2, the next generation of GRB polarization detector
Nicolas Produit, Merlin Kole, Xin Wu +9
The POLAR-2 Gamma-Ray Burst (GRB) Polarimetry mission is a follow-up to the successful POLAR mission. POLAR collected six months of data in 2016-2017 on board the Tiangong-2 Chines…
The POLAR Gamma-Ray Burst Polarization Catalog
Merlin Kole, Nicolas De Angelis, Francesco Berlato +18
Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. Polarization measurements of the prompt emission of these extreme phenomena have…
Future Perspectives for Gamma-ray Burst Detection from Space
Enrico Bozzo, Lorenzo Amati, Wayne Baumgartner +35
Since their first discovery in the late 1960s, Gamma-ray bursts have attracted an exponentially growing interest from the international community due to their central role in the m…
Chasing Gravitational Waves with the Cherenkov Telescope Array
Jarred Gershon Green, Alessandro Carosi, Lara Nava +563
The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts…
A crosstalk and non-uniformity correction method for the Compact Space-borne Compton Polarimeter POLAR
Hualin Xiao, Wojtek Hajdas, Bobing Wu +33
In spite of extensive observations and numerous theoretical studies in the past decades several key questions related with Gamma-Ray Bursts (GRB) emission mechanisms are still to b…