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18 papers · 2 filters
Precursor flares in OJ 287
P. Pihajoki, M. Valtonen, S. Zola +19
We have studied three most recent precursor flares in the light curve of the blazar OJ 287 while invoking the presence of a precessing binary black hole in the system to explain th…
Cosmic Rays and Terrestrial Life: A Brief Review
Dimitra Atri, Adrian L. Melott
"The investigation into the possible effects of cosmic rays on living organisms will also offer great interest." - Victor F. Hess, Nobel Lecture, December 12, 1936 High-energy radi…
Radio Detection of the Fermi LAT Blind Search Millisecond Pulsar J1311-3430
P. S. Ray, S. M. Ransom, C. C. Cheung +15
We report the detection of radio emission from PSR J1311-3430, the first millisecond pulsar discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data. We dete…
Illuminating the Darkest Gamma-Ray Bursts with Radio Observations
B. A. Zauderer, E. Berger, R. Margutti +15
We present X-ray, optical, near-infrared, and radio observations of GRBs 110709B and 111215A, as well as optical and near-IR observations of their host galaxies. The combination of…
Fractional amplitude of kilohertz quasi-periodic oscillation from 4U 1728-34: evidence of decline at higher energies
Arunava Mukherjee, Sudip Bhattacharyya
A kilohertz quasi-periodic oscillation (kHz QPO) is an observationally robust high-frequency timing feature detected from neutron star low-mass X-ray binaries (LMXBs). This feature…
Black hole binary OJ287 as a testing platform for general relativity
M. J. Valtonen, A. Gopakumar, S. Mikkola +2
The blazar OJ287 is the most promising (and the only) case for an extragalactic binary black hole system inspiralling under the action of gravitational radiation reaction. At prese…
X-ray Observations of INTEGRAL Discovered Cataclysmic Variable IGR J17195-4100
V. Girish, K. P. Singh
We present analysis of archival X-ray data obtained with the XMM-Newton and Suzaku for a new Intermediate Polar identified as a counterpart of an INTEGRAL discovered gamma-ray sour…
Comprehensive multi-wavelength modelling of the afterglow of GRB050525A
L. Resmi, K. Misra, G. Jóhannesson +13
The Swift era has posed a challenge to the standard blast-wave model of Gamma Ray Burst (GRB) afterglows. The key observational features expected within the model are rarely observ…
Multi-Wavelength Observations of Supernova 2011ei: Time-Dependent Classification of Type IIb and Ib Supernovae and Implications for their Progenitors
D. Milisavljevic, R. Margutti, A. M. Soderberg +39
We present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN) 2011ei, one of the least luminous SNe IIb or Ib observed to date. Our ob…
Radio and X-ray observations of SN 2006jd: Another strongly interacting Type IIn supernova
Poonam Chandra, Roger A. Chevalier, Nikolai Chugai +5
We report four years of radio and X-ray monitoring of the Type IIn supernova SN 2006jd at radio wavelengths with the Very Large Array, Giant Metrewave Radio Telescope and Expanded…
X-Ray emission from SN 2004dj: A Tale of Two Shocks
Sayan Chakraborti, Naveen Yadav, Alak Ray +2
Type IIP (Plateau) Supernovae are the most commonly observed variety of core collapse events. They have been detected in a wide range of wavelengths from radio, through optical to…
Gamma Ray Burst Prompt Emission Variability in Synchrotron and Synchrotron Self-Compton Lightcurves
L. Resmi, B. Zhang
Gamma Ray Burst prompt emission is believed to originate from electrons accelerated in a highly relativistic outflow. "Internal shocks" due to collisions between shells ejected by…
Anti-correlated time lags in the Z source GX 5-1: Possible evidence for a truncated accretion disk
K. Sriram, C. S. Choi, A. R. Rao
We investigate the nature of the inner accretion disk in the neutron star source GX 5-1 by making a detailed study of time lags between X-rays of different energies. Using the cros…
Multiwavelength study of TeV Blazar Mrk421 during giant flare
A. Shukla, V. R. Chitnis, P. R. Vishwanath +7
Context: The nearby (z=0.031) TeV blazar Mrk421 was reported to be in a high state of flux activity since November, 2009. Aims: To investigate possible changes in the physical para…
Fast transition of type-B QPO in the black hole transient XTE J1817-330
K. Sriram, A. R. Rao, C. S. Choi
The evolution of different types of quasi-periodic oscillations (QPOs) and the coupled radiative/physical changes in the accretion disk are still poorly understood. In a few black…
Evidence of two unique variability classes from IGR J17091-3624
Mayukh Pahari, Sudip Bhattacharyya, J. S. Yadav +1
IGR J17091-3624 is the second black hole X-ray binary after GRS 1915+105, which showed large and distinct variabilities. The study of these variability classes can be useful to und…
Thermonuclear X-ray bursts from the 401 Hertz accreting pulsar IGR J17498-2921: indication of burning in confined regions
Manoneeta Chakraborty, Sudip Bhattacharyya
We use the 2011 Rossi X-ray Timing Explorer (RXTE) proportional counter array (PCA) data of the 401 Hz accreting pulsar and burster IGR J17498-2921 to perform timing analysis and t…
Correlation between the isotropic energy and the peak energy at zero fluence for the individual pulses of GRBs: towards an universal physical correlation for the prompt emission
Rupal Basak, A. R. Rao
We find a strong correlation between the peak energy at zero fluence () and the isotropic energy () of the 22 pulses of 9 Gamma Ray Bursts (GRB) dete…