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60 papers · 2 filters
Detection of X-ray pulsations at the lowest observed luminosity of Be/X-ray binary pulsar EXO 2030+375 with AstroSat
Gaurava K. Jaisawal, Sachindra Naik, Shivangi Gupta +4
We present the results obtained from timing and spectral studies of Be/X-ray binary pulsar EXO 2030+375 using observations with the Large Area Xenon Proportional Counters and Soft…
Broadband Modelling of Orphan Gamma Ray Flares
S. R. Patel, D. Bose, N. Gupta +1
Blazars, a class of highly variable active galactic nuclei, sometimes exhibit Orphan -ray flares. These flares having high flux only in -ray energies do not show significant…
Double-peaked Lines, Dual VLBI Components, and Precessing Jets in J1328+2751
S. Nandi, A. Caproni, P. Kharb +2
In this work, we report a radio galaxy with precessing jets, double-peaked emission lines and the presence of two compact radio components with a projected separation of ~6 parsec…
Observations of bright stars with AstroSat Soft X-ray Telescope
K. P. Singh, G. Stewart, S. Chandra +5
We present observations of four bright stars observed with the AstroSat Soft X-ray Telescope (SXT). Visible light from bright stars like these can leak through the very thin filter…
Diving below the spin-down limit: Constraints on gravitational waves from the energetic young pulsar PSR J0537-6910
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1589
We present a search for continuous gravitational-wave signals from the young, energetic X-ray pulsar PSR J0537-6910 using data from the second and third observing runs of LIGO and…
LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
Z. Pleunis, D. Michilli, C. G. Bassa +32
FRB 20180916B is a well-studied repeating fast radio burst source. Its proximity (~150 Mpc), along with detailed studies of the bursts, have revealed many clues about its nature --…
Fast Optical Transients from Stellar-Mass Black Hole Tidal Disruption Events in Young Star Clusters
Kyle Kremer, Wenbin Lu, Anthony L. Piro +3
Observational evidence suggests that the majority of stars may have been born in stellar clusters or associations. Within these dense environments, dynamical interactions lead to h…
First discovery of new pulsars and RRATs with CHIME/FRB
D. C. Good, B. C. Andersen, P. Chawla +20
We report the discovery of seven new Galactic pulsars with the Canadian Hydrogen Intensity Mapping Experiment's Fast Radio Burst backend (CHIME/FRB). These sources were first ident…
AstroSat view of IGR J17091-3624 and GRS 1915+105: decoding the 'pulse' in the 'Heartbeat State'
Tilak Katoch, Blessy E. Baby, Anuj Nandi +3
IGR J17091--3624 is a transient galactic black hole which has a distinct quasi-periodic variability known as `heartbeat', similar to the one observed in GRS 1915+105. In this paper…
Mode changing, subpulse drifting and nulling in four component conal pulsar PSR J2321+6024
Sk. Minhajur Rahaman, Rahul Basu, Dipanjan Mitra +1
In this study, we report on a detailed single pulse polarimetric analysis of the radio emission from the pulsar J2321+6024 (B2319+60) observed with the Giant Metrewave Radio Telesc…
Radio counterparts of gamma-ray sources in the Cygnus region
Paula Benaglia, C. H. Ishwara-Chandra, Josep M. Paredes +3
The view of the gamma-ray universe is being continuously expanded by space high energy (HE) and ground based very-high energy (VHE) observatories. Yet, the angular resolution limit…
The Search for Fast Transients with CZTI
Y. Sharma, A. Marathe, V. Bhalerao +9
The Cadmium Zinc Telluride Imager on AstroSat has proven to be a very effective all-sky monitor in the hard X-ray regime, detecting over three hundred GRBs and putting highly compe…
The 60 pc Environment of FRB 20180916B
Shriharsh P. Tendulkar, Armando Gil de Paz, Aida Yu. Kirichenko +18
Fast Radio Burst FRB 20180916B in its host galaxy SDSS J015800.28+654253.0 at 149 Mpc is by far the closest-known FRB with a robust host galaxy association. The source also exhibit…
Constraining millisecond pulsar geometry using time-aligned radio and gamma-ray pulse profile
O. Benli, J. Petri, Dipanjan Mitra
Since the launch of the Fermi Gamma-Ray Space Telescope, several hundred gamma-ray pulsars have been discovered, some being radio-loud and some radio-quiet with time-aligned radio…
Discovery of a Gamma-ray Black Widow Pulsar by GPU-accelerated Einstein@Home
L. Nieder, C. J. Clark, D. Kandel +39
We report the discovery of 1.97 ms period gamma-ray pulsations from the 75 minute orbital-period binary pulsar now named PSR J1653-0158. The associated Fermi Large Area Telescope g…
Search for Off-pulse emission in Long Period Pulsars
Rahul Basu, Dipanjan Mitra, George I. Melikidze
We have revisited the problem of off-pulse emission in pulsars, where detailed search for the presence of low level radio emission outside the pulse window is carried out. The pres…
AstroSat Observations of the first Galactic ULX Pulsar Swift J0243.6+6124
Aru Beri, Sachindra Naik, K. P Singh +11
SwiftJ0243.6+6124, the first Galactic ultra-luminous X-ray pulsar, was observed during its 2017-2018 outburst with \emph{AstroSat} at both sub- and super-Eddington levels of accret…
Multi-waveband quasi-periodic oscillations in the light curves of blazar CTA 102 during its 2016-2017 optical outburst
Arkadipta Sarkar, Pankaj Kushwaha, Alok C. Gupta +2
Quasi-periodic fluctuations in the light curves of blazars can provide insight into the underlying emission process. This type of flux modulation hints at periodic physical process…
AstroSat view of GRS 1915+105 during the Soft State: Detection of HFQPOs and estimation of Mass and Spin
Sreehari H., Anuj Nandi, Santabrata Das +4
We report the results of AstroSat observations of GRS 1915105 obtained using 100 ks guaranteed-time (GT) during the soft state. The Color-Color Diagram (CCD) indicates a variabi…
Search for Gravitational Waves Associated with Gamma-Ray Bursts Detected by Fermi and Swift During the LIGO-Virgo Run O3a
The LIGO Scientific Collaboration, the Virgo Collaboration, R. Abbott +1250
We search for gravitational-wave transients associated with gamma-ray bursts detected by the Fermi and Swift satellites during the first part of the third observing run of Advanced…
Population Properties of Compact Objects from the Second LIGO-Virgo Gravitational-Wave Transient Catalog
The LIGO Scientific Collaboration, the Virgo Collaboration, R. Abbott +1338
We report on the population of the 47 compact binary mergers detected with a false-alarm rate 1/yr in the second LIGO--Virgo Gravitational-Wave Transient Catalog, GWTC-2. We observ…
Improved early warning of compact binary mergers using higher modes of gravitational radiation: A population study
Mukesh Kumar Singh, Shasvath J. Kapadia, Md Arif Shaikh +2
A gravitational-wave (GW) early-warning of a compact-binary coalescence event, with a sufficiently tight localisation skymap, would allow telescopes to point in the direction of th…
Scintillation of PSR B1508+55 -- the view from a 10,000-km baseline
V. R. Marthi, D. Simard, R. A. Main +6
We report on the simultaneous Giant Metrewave Radio Telescope (GMRT) and Algonquin Radio Observatory (ARO) observations at 550-750 MHz of the scintillation of PSR B1508+55, resulti…
A Possible -ray Quasi-periodic Oscillation of 314 days in the Blazar OJ 287
Pankaj Kushwaha, Arkadipta Sarkar, Alok C. Gupta +3
We report the detection of a probable -ray quasi-periodic oscillation (QPO) of around 314 days in the monthly binned 0.1 -- 300 GeV -ray {\it Fermi}-LAT light curve of the we…