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Revisiting neutrino event epochs for the blazar PKS 0735+178 with TESS
Shubham Kishore, Alok C. Gupta, Debanjan Bose
We present here the results of the optical light curve variability analysis of the blazars PKS 0735+178, in weeks-scale flare state, observed in three sectors with the Transiting E…
Observation of Wobbling and Precessing Jet Signatures in Gamma-Ray Emission from Blazar PKS 1424-41
Ajay Sharma, Debanjan Bose
We report a clear observational evidence for jet precession and nutation manifested in the gamma-ray emissions of the blazar PKS 142441. An analysis of 16 yr of \emph{Ferm…
Hadronic Emissions from the Microquasar V4641 Sgr, SS433, and its implications in the Diffuse Galactic Emission
Basanti Paul, Abhijit Roy, Jagdish C. Joshi +1
Microquasars (MQs) are Galactic binary systems, consisting of a star and a compact object, a neutron star or a stellar mass black hole, which accretes matter from its companion sta…
Multi Messenger Study of GRB 221009A with VHE Gamma-ray and Neutrino Afterglow from a Gaussian Structured Jet
T. Mondal, S. Razzaque, Jagdish C. Joshi +2
Recent detections of very-high-energy (VHE; ) emission from GRB afterglows, most notably the unprecedented brightness of GRB~221009A observed by LHAASO, reve…
Broadband Spectral Modeling of Blazars: Constraining the Lorentz Factor and Gamma-Ray Emission Site
Ajay Sharma, Aishwarya Sarath, Sakshi Chaudhary +1
We present a comprehensive temporal and spectral analysis of a few blazars using multi-wavelength observations. Rapid flux variations are quantified via the doubling/halving timesc…
A White Paper on The Multi-Messenger Science Landscape in India
Samsuzzaman Afroz, Sanjib Kumar Agarwalla, Dipankar Bhattacharya +35
The multi-messenger science using different observational windows to the Universe such as Gravitational Waves (GWs), Electromagnetic Waves (EMs), Cosmic Rays (CRs), and Neutrinos o…
Exploring Year-timescale Gamma-ray Quasi-Periodic Oscillations in Blazars: Evidence for Supermassive Binary Black Holes Scenario
Ajay Sharma, Sakshi Chaudhary, Aishwarya Sarath +1
A comprehensive analysis of quasi-periodic oscillations (QPOs) in the gamma-ray emissions of blazars. Utilizing 15 years of Fermi-LAT observations of seven blazars in our sample, w…
Comprehensive Variability Analysis of Blazars Using Fermi Light Curves Across Multiple Timescales
Zahir Shah, Athar A. Dar, Sikandar Akbar +8
In this study, we conducted a systematic analysis of long-term Fermi-LAT γ-ray data for a sample of blazars, including FSRQs, BL\,Lacs, and BCUs, to investigate their -ray varia…
Searching for quasi periodic oscillations in optical and -ray emissions black hole mass estimation of blazar ON 246
Ajay Sharma, Raj Prince, Debanjan Bose
We report the detection of a potential quasi-periodic signal with a period of years in the blazar ON 246, based on Fermi-LAT (-rays) and ASAS-SN (optical) observations s…
Study of Multi-Wavelength Variability, Emission Mechanism and Quasi-Periodic Oscillation for Transition Blazar S5 1803+784
Javaid Tantry, Ajay Sharma, Zahir Shah +2
This work present the results of a multi-epoch observational study of the blazar S5\,1803+784, carried out from 2019 to 2023. The analysis is based on simultaneous data obtained fr…
Signature of hadronic emission in gamma-ray spectrum of B2 1308+326
Athar A. Dar, Zahir shah, Sunder Sahayanathan +3
The Flat Spectrum Radio Quasar (FSRQ) B2\,1308+326 was in its highest -ray flaring state during 60260-60310\,MJD. During this period, the source was detected in very high energy…
Microquasars to AGNs: An uniform Jet variability
Ajay Sharma, Raj Prince, Debanjan Bose
The long-term variability study over a range of black hole (BH) mass systems from the microquasars of stellar-mass black holes to the Active Galactic Nuclei (AGNs) of supermassive…
Detection of a Transient Quasi-periodic Oscillation in -Rays from Blazar PKS 2255-282
Ajay Sharma, Anuvab Banerjee, Avik Kumar Das +2
We conducted a comprehensive variability analysis of the blazar PKS 2255-282 using Fermi-LAT observations spanning over four years, from MJD 57783.5 to 59358.5. Our analysis reveal…
Detection of gamma-ray quasi-periodic oscillations in non-blazar AGN PKS 0521-36
Ajay Sharma, Raj Prince, Debanjan Bose
Quasi-periodic oscillations (QPOs) have been detected in many Fermi-detected bright blazars. In this letter, we report multiple QPOs detected in a non-blazar AGN PKS 0521-36 search…
Probing the disc-jet coupling in S4 0954+65, PKS 0903-57, & 4C +01.02 with -rays
Ajay Sharma, Sushanth Reddy Kamaram, Raj Prince +2
We present a comprehensive variability study on three blazars, S4 0954+65, PKS 0903-57, and 4C +01.02 covering a mass range of log(M/M) = 8--9, by using 15 years-lo…
Quasi-periodic oscillation detected in -rays in blazar PKS 0346-27
Raj Prince, Anuvab Banerjee, Ajay Sharma +3
We present a variability study of the blazar PKS 0346-27 from December 2018 to January 2022 in its archival -ray observation by Fermi-LAT. We use the Lomb-Scargle periodogram an…
Multi-wavelength temporal and spectral analysis of Blazar S5 1803+78
Shruti Priya, Raj Prince, A. Agarwal +3
Blazars are a class of AGN, one of their jets is pointed towards the earth. Here, we report about the multi-wavelength study for blazar S5 1803+78 between MJD 58727 to MJD 59419. W…
Physics Performance of the Large-Sized Telescope prototype of the Cherenkov Telescope Array
R. López-Coto, A. Moralejo, M. Artero +15
The Large-Sized Telescope (LST) prototype of the future Cherenkov Telescope Array (CTA) is located at the Northern site of CTA, on the Canary Island of La Palma. It is designed to…