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21 papers · 2 filters
Discovery of PSR J1227-4853: A transition from a low-mass X-ray binary to a redback millisecond pulsar
Jayanta Roy, Paul S. Ray, Bhaswati Bhattacharyya +12
XSS J12270-4859 is an X-ray binary associated with the Fermi LAT gamma-ray source 1FGL J1227.9-4852. In 2012 December, this source underwent a transition where the X-ray and optica…
Searches for continuous gravitational waves from nine young supernova remnants
J. Aasi, B. P. Abbott, R. Abbott +887
We describe directed searches for continuous gravitational waves in data from the sixth LIGO science data run. The targets were nine young supernova remnants not associated with pu…
A real-time fast radio burst: polarization detection and multiwavelength follow-up
E. Petroff, M. Bailes, E. D. Barr +32
Fast radio bursts (FRBs) are one of the most tantalizing mysteries of the radio sky; their progenitors and origins remain unknown and until now no rapid multiwavelength follow-up o…
Brightest Fermi-LAT Flares of PKS 1222+216: Implications on Emission and Acceleration Processes
Pankaj Kushwaha, K. P. Singh, S. Sahayanathan
We present a high time resolution study of the two brightest -ray outbursts from a blazar PKS 1222+216 observed by the \textit{Fermi} Large Area Telescope (LAT) in 2010. The …
Estimation of the Extragalactic Background Light using TeV Observations of BL~Lacs
Atreyee Sinha, Sunder Sahayanathan, Ranjeev Misra +2
The very high energy (VHE) gamma ray spectral index of high energy peaked blazars correlates strongly with its corresponding redshift whereas no such correlation is observed in the…
Observational constraints on spinning, relativistic Bose-Einstein condensate stars
Arunava Mukherjee, Shreya Shah, Sukanta Bose
Bose-Einstein condensates (BECs) have been proposed as candidate states of matter for the interior of neutron stars. Specifically, Chavanis and Harko obtained the mass-radius relat…
Discovery of Smoothly Evolving Blackbodies in the Early Afterglow of GRB 090618 : Evidence for a Spine-Sheath Jet?
Rupal Basak, A. R. Rao
GRB 090618 is a bright GRB with multiple pulses. It shows evidence of thermal emission in the initial pulses as well as in the early afterglow phase. As high resolution spectral da…
A 24-Hour Global Campaign To Assess Precision Timing of the Millisecond Pulsar J1713+0747
T. Dolch, M. T. Lam, J. M. Cordes +40
The radio millisecond pulsar J1713+0747 is regarded as one of the highest-precision clocks in the sky, and is regularly timed for the purpose of detecting gravitational waves. The…
Evidence of thermonuclear flame spreading on neutron stars from burst rise oscillations
Manoneeta Chakraborty, Sudip Bhattacharyya
Burst oscillations during the rising phases of thermonuclear X-ray bursts are usually believed to originate from flame spreading on the neutron star surface. However, the decrease…
Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO600, LIGO, and Virgo detectors
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +889
In this paper we report on a search for short-duration gravitational wave bursts in the frequency range 64 Hz-1792 Hz associated with gamma-ray bursts (GRBs), using data from GEO60…
Possible Proton Synchrotron Origin of X-Ray & Gamma Ray Emission in Large Scale Jet of 3C 273
Esha Kundu, Nayantara Gupta
The large scale jet of quasar 3C 273 has been observed in radio to ray frequencies. Earlier the X-ray emission from knot A of this jet has been explained with inverse Compton s…
Uncovering the Putative B-Star Binary Companion of the SN 1993J Progenitor
Ori D. Fox, K. Azalee Bostroem, Schuyler D. Van Dyk +9
The Type IIb supernova (SN) 1993J is one of only a few stripped-envelope supernovae with a progenitor star identified in pre-explosion images. SN IIb models typically invoke H enve…
The Luminosity Function of Low Mass X-Ray Binaries in the Globular Cluster System of NGC 1399
Giuseppe D'Ago, Maurizio Paolillo, Giuseppina Fabbiano +5
We present a study of the faint-end of the X-ray Luminosity Function of Low Mass X-ray binaries in the Globular Cluster system of the cD galaxy NGC 1399 by performing a stacking ex…
Time-resolved Spectral Study Of Fermi GRBs Having Single Pulses
Rupal Basak, A. R. Rao
We analyze gamma-ray bursts (GRBs) detected by \textit{Fermi}/Gamma-Ray Burst Monitor (GBM) and having single pulse. We fit the light curves with a model having exponential rise an…
Gamma-ray Flare of PKS 1222+216 in 2010: Effect of Jet Dynamics at the Recollimation Zone
Pankaj Kushwaha, S. Sahayanathan, L. Resmi +3
The -ray flare of PKS 1222+216, observed in June 2010, is interpreted as an outcome of jet dynamics at recollimation zone. We obtained the -ray light-curves in three differen…
Search for gravitational waves associated with gamma-ray bursts detected by the InterPlanetary Network
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +901
We present the results of a search for gravitational waves associated with 223 gamma-ray bursts (GRBs) detected by the InterPlanetary Network (IPN) in 2005-2010 during LIGO's fifth…
GRB as luminosity indicator
Rupal Basak, A. R. Rao
Gamma Ray Bursts (GRBs) are found at much higher redshifts (z>6) than Supernova Ia (z~1), and hence, they can be used to probe very primitive universe. However, radiation mechanism…
Relativistic supernovae have shorter-lived central engines or more extended progenitors: the case of SN\,2012ap
R. Margutti, D. Milisavljevic, A. M. Soderberg +10
Deep late-time X-ray observations of the relativistic, engine-driven, type Ic SN2012ap allow us to probe the nearby environment of the explosion and reveal the unique properties of…
A Missing-Link in the Supernova-GRB Connection: The Case of SN 2012ap
Sayan Chakraborti, Alicia Soderberg, Laura Chomiuk +50
Gamma Ray Bursts (GRBs) are characterized by ultra-relativistic outflows, while supernovae are generally characterized by non-relativistic ejecta. GRB afterglows decelerate rapidly…
Constraints on the synchrotron self-Compton mechanism of TeV gamma ray emission from the Milagro TeV source MGRO J2019+37 within the pulsar wind nebula scenario
Lab Saha, Pijushpani Bhattacharjee
Origin of the TeV gamma ray emission from MGRO J2019+37 discovered by the Milagro experiment is investigated within the pulsar wind nebula (PWN) scenario using multiwavelength info…
Detecting gravitational waves from the galactic center with Pulsar Timing
Alak Ray, Bence Kocsis, Simon Portegies Zwart
Black holes orbiting the Super Massive Black Hole (SMBH) Sgr A* in the Milky-way galaxy center (GC) generate gravitational waves. The spectrum, due to stars and black holes, is con…