A5082348867- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Noncommutative and Quantum Gravity Theories
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Earthquake Detection and Analysis
- Radioactive Decay and Measurement Techniques
- Particle physics theoretical and experimental studies
- GNSS positioning and interference
- Statistical and numerical algorithms
- Neutrino Physics Research
Indian Institute of Technology Hyderabad
2022-2024
ABSTRACT We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). include 64813 observations 535 events (including upper limits) from 28 February 1997 to 18 August 2023. also a user-friendly web tool grbLC which allows users visualize photometry, coordinates, redshift, host galaxy extinction, and spectral indices for each event in our database. Furthermore, we have added Gamma-ray Coordinate Network (GCN) scraper that can be used collect data by...
Abstract We carry out a stacked search for spatial coincidences between all the known radio pulsars and TeV neutrinos from IceCube 10 year (2008–2018) muon track data, as followup to our previous work on searching with individual pulsars. consider three different weighting schemes stack contributions each pulsar. do not find statistically significant excess using this method. report 95% c.l. neutrino flux upper limit function of energy. have also made analysis codes publicly available.
We search for a spatial association between radio pulsars and ultra-high energy neutrinos using the publicly available IceCube point source neutrino events catalog. For this purpose we use unbinned maximum likelihood method to statistically significant excess from each of in ATNF do not find any with detection significance much higher than that expected Gaussian distribution, Therefore, conclude none currently known contribute diffuse flux detected by IceCube.
Abstract We apply the generalized Lomb–Scargle periodogram to 22 years data of solar $$^{8}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow/><mml:mn>8</mml:mn></mml:msup></mml:math> B neutrino fluxes detected by Super-Kamiokande. The primary motivation this work was check if sinusoidal modulation at a frequency 9.43/year (with period 38 days), which we had found be marginally significant with first 5 Super-K data, persists, accumulated data. use four different...
We search for gamma-ray emission from OJ287 in the energy range 0.1-300 GeV during 2015-2023, coincidence with an extensive observing campaign to monitor optical flux variability and polarization, as discussed arXiv:2311.02372. present results eight segments aforementioned period, each segment corresponding season. report non-zero (with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We apply the generalized Lomb-Scargle periodogram to 22 years data of solar $^{8}$B neutrino fluxes detected by Super-Kamiokande. The primary motivation this work was check if sinusoidal modulation at a frequency 9.43/year (with period 38 days), which we had found be marginally significant with first five Super-K data, persists, accumulated data. use four different metrics for calculation significance. do not find any evidence periodicity aforementioned or other updated Therefore only...
We present the largest optical photometry compilation of Gamma-Ray Bursts (GRBs) with redshifts ($z$). include 64813 observations 535 events (including upper limits) from 28 February 1997 up to 18 August 2023. also a user-friendly web tool \textit{grbLC} which allows users visualization photometry, coordinates, redshift, host galaxy extinction, and spectral indices for each event in our database. Furthermore, we have added Gamma Ray Coordinate Network (GCN) scraper that can be used collect...
We search for gamma-ray emission from OJ287 in the energy range 0.1-300 GeV during 2015-2023, coincidence with an extensive observing campaign to monitor optical flux variability and polarization, as discussed arXiv:2311.02372. present results eight segments aforementioned period, each segment corresponding season. report non-zero (with $>10\sigma$ significance) all segments. The photon observed this period is $\sim 5.2 \times 10^{-8} \rm{ph~cm^{-2}~s^{-1}}$ $2.75 10^{-5}...
We carry out a stacked search for spatial coincidences between all the known radio pulsars and TeV neutrinos from IceCube 10 year (2008-2018) muon track data, as followup to our previous work on searching with individual pulsars. consider three different weighting schemes stack contributions each pulsar. do not find statistically significant excess using this method. report 95\% c.l. neutrino flux upper limit function of energy. have also made analysis codes publicly available.
We use the spectral lag data of 32 long GRBs detected by Fermi/GBM, which has been recently collated in Liu et al (2022) to quantify statistical significance a transition based on Lorentz invariance violation (LIV) (for both sub-luminal and super-luminal propagation) using Bayesian model selection. two different parametric functions null hypothesis only intrinsic emission: smooth broken power law (SBPL) (proposed al) as well simple model, widely used before literature. find that for...
We search for a spatial association between radio pulsars and ultra-high energy neutrinos using the publicly available IceCube point source neutrino events catalog. For this purpose we use unbinned maximum likelihood method to statistically significant excess from each of in ATNF do not find any with detection significance much higher than that expected Gaussian distribution, Therefore, conclude none currently known contribute diffuse flux detected by IceCube.