Chikungunya fever: A re-emerging viral infection (2008)
Chhabra, M., Mittal, V., Bhattacharya, D., Rana, U.V.S., Lal, S.
Chikungunya (CHIK) fever is a re-emerging viral disease characterized by abrupt onset of fever with severe arthralgia followed by constitutional symptoms and rash lasting for 1-7 days. The disease is...
Optical Observations of GRB 050401 Afterglow : A case for Double Jet Model (2008)
Kamble, Atish, Misra, Kuntal, Bhattacharya, D., Sagar, Ram
The afterglow of GRB 050401 presents several novel and interesting features : [1] An initially faster decay in optical band than in X-rays. [2] A break in the X-ray light curve after $\sim$ 0.06 day...
Hard electron energy distribution in the relativistic shocks of gamma-ray burst afterglows (2008)
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Hard Electron Energy Distribution in the Relativistic Shocks of GRB Afterglows (2008)
Particle acceleration in relativistic shocks is not a very well understood subject. Owing to that difficulty, radiation spectra from relativistic shocks, such as those in GRB afterglows, have been...
Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase (2008)
Van Der Horst, A.J., Kamble, Atish, Resmi, L., Bhattacharya, D., Scheers, B., ...
Open Access
Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase (2008)
Horst, AJ Van Der, Kamble, A, Resmi, L, Wijers, RAMJ, Bhattacharya, D, Scheers, B, ...
Context. We explore the physics behind one of the brightest radio afterglows ever, GRB 030329, at late times when the jet is non-relativistic. Aims. We determine the physical parameters of the blast...
Hard electron energy distribution in the relativistic shocks of gamma-ray burst afterglows (2008)
Particle acceleration in relativistic shocks is not a very well understood subject. Owing to that difficulty, radiation spectra from relativistic shocks, such as those in gamma-ray burst (GRB)...
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A. J, Bremer, M, McBreen, S, Gorosabel, J, Guziy, S, Fakthullin, T. A, ...
Aims.We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 h and ~1.15 yr after the event. It is the most intense gamma-ray burst (~10-4 erg cm-2)...
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A.J., Bremer, M., McBreen, S., Kamble, A.P., Bhattacharya, D.
Open Access.
Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio (2007)
Misra, Kuntal, Pooley, Dave, Chandra, Poonam, Bhattacharya, D., Ray, Alak K., Sagar, Ram, ...
We present X-ray, broad band optical and low frequency radio observations of the bright type IIP supernova SN 2004et. The \cxo observed the supernova at three epochs, and the optical coverage spans a...
Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase (2007)
Van Der Horst, A. J., Kamble, A., Resmi, L., Bhattacharya, D., Scheers, B., ...
We explore the physics behind one of the brightest radio afterglows ever, GRB 030329, at late times when the jet is non-relativistic. We determine the physical parameters of the blast wave and its...
GRB 030329: 3 years of radio afterglow monitoring (2007)
Van Der Horst, A. J., Kamble, A., Resmi, L., Bhattacharya, D., Rol, E., ...
Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of GRB explosions much...
GRB 030329: three years of radio afterglow monitoring (2007)
Van Der Horst, A. J., Kamble, A., Resmi, L., Bhattacharya, D., Rol, E., ...
Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of GRB explosions much...
Adamson, P., Alexopoulos, T., J. Alner, G., Anderson, K., Andreopoulos, C., ...
The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the...
Charge-Separated Atmospheric Neutrino-Induced Muons in the MINOS Far Detector (2007)
Adamson, P., Andreopoulos, C., E. Arms, K., Armstrong, R., J. Auty, D., Avvakumov, S., ...
We found 140 neutrino-induced muons in 854.24 live days in the MINOS far detector. We looked for evidence of neutrino disappearance in this data set by computing the ratio of the number of low...
G. Michael, D., Adamson, P., Alexopoulos, T., J. Alner, G., Anderson, K., ...
This letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rate and energy spectra of charged current muon neutrino interactions...
Adamson, P., Andreopoulos, C., E. Arms, K., Armstrong, R., J. Auty, D., Avvakumov, S., ...
The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the...
Optical observations of GRB 060124 afterglow: a case for an injection break (2007)
Misra, K, Bhattacharya, D, Sahu, D. K, Ram Sagar, Anupama, G. C, Castro-Tirado, A. J, ...
Aims.We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the...
Optical observations of GRB 060124 afterglow: A case for an injection break (2007)
Misra, K., Bhattacharya, D., Sahu, D.K., Sagar, R., Anupama, G.C., Castro-Tirado, A.J., ...
Open Access.
De Ugarte, Postigo A., Fatkhullin, T.A., Bhattacharya, D., Kamble, Atish P.
Open Access.
Optical observations of GRB 060124 afterglow: A case for an injection break (2007)
Misra, Kuntal, Bhattacharya, D., Sahu, D. K., Sagar, Ram, Anupama, G. C., Castro-Tirado, A. J., ...
We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the earliest...
Optical observations of GRB 060124 afterglow: a case for an injection break (2007)
Misra, Kuntal, Bhattacharya, D., Sahu, D.K., Sagar, R., Anupama, G.C., Castro-Tirado, A.J., ...
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
The dark nature of GRB 051022 and its host galaxy (2007)
Castro-Tirado, A. J., Bremer, M., McBreen, S., Gorosabel, J., Guziy, S., Fakthullin, T. A., ...
Postigo, A De Ugarte, Fatkhullin, T. A., Johannesson, G., Gorosabel, J., Sokolov, V. V., Castro-Tirado, A. J., ...
Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the time from the...
A consistent description of neutron stars with quark cores (2006)
Soni, Vikram, Bhattacharya, D.
This item consists of 2 files: Author's postprint version (Open Access) and Published version (Restricted Access)
The celestial mechanics of Newton (2006)
Newton's law of universal gravitation laid the physical foundation of celestial mechanics. This article reviews the steps towards the law of gravitation, and highlights some applications to celestial...
Misra, K, Resmi, L, Pandey, S. B, Bhattacharya, D, Sagar, R
We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a p1...
Misra, Kuntal, Resmi, L., Pandey, S. B., Bhattacharya, D., Sagar, R.
We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a...
Optical afterglow observations of GRB 021004 and GRB 030226 (2005)
Pandey, S.B., Sagar, R., Bhattacharya, D.
Paper presented at the AIP conference held at Torun, Poland, during 20-24 June 2005. Ed. by Tomasz Bulik et al.
Optical afterglow observations of GRB 021004 and GRB 030226 (2005)
Pandey, S.B., Sagar, R., Bhattacharya, D.
Open Access. Paper presented at the AIP conference on "Astrophysical sources of high energy particles and radiation" edited by T. Bulik et al.
Resmi, L., Ishwara-Chandra, C.H., Castro-Tirado, A.J., Bhattacharya, D.
We present radio, millimeter and optical observations of the afterglow of GRB 030329. UBVR_CIC photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz has...
Resmi, L., Ishwara-Chandra, C. H., Castro-Tirado, A. J., Bhattacharya, D., Rao, A. P., Bremer, M., ...
We present radio, millimeter and optical observations of the afterglow of GRB030329. UBVR_{C}I_{C} photometry is presented for a period of 3 hours to 34 days after the burst. Radio monitoring at 1280...
Multiband optical photometry and bolometric light curve of the Type Ia supernova 2004S (2005)
Misra, Kuntal, Kamble, Atish P., Bhattacharya, D., Sagar, R.
Restricted Access. An open access version is available at arXiv.org.(one of the alternative locations)
Multiband Optical Photometry and Bolometric Light Curve of the Type Ia Supernova 2004S (2005)
Misra, Kuntal, Kamble, Atish P., Bhattacharya, D., Sagar, Ram
We present $\rm BVR_{c}I_{c}$ broad band CCD photometry of the Type Ia supernova SN 2004S, which appeared in the galaxy MCG-05-16-021, obtained during 2004 February 12 to March 22. Multiband and...
Resmi, L, Chandra, Ishwara CH, Tirado, Castro AJ, Bhattacharya, D, Rao, AP, Bremer, M, ...
We present radio, millimeter and optical observations of the afterglow of GRB 030329. $UBVR_CI_C$ photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz...
Adamson, P., Alexopoulos, T., J. Alner, G., Anderson, K., Andreopoulos, C., ...
The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the...
Adamson, P., Alexopoulos, T., J. Alner, G., Anderson, K., Andreopoulos, C., ...
The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the...
Misra, Kuntal, Resmi, L., Pandey, S.B., Bhattacharya, D., Sagar, R.
We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a...
Magnetic Barkhausen emission to evaluate fatigue damage in a low carbon structural steel (2005)
Sagar, S., Parida, N., Das, S., Dobmann, G., Bhattacharya, D.
The various stages of fatigue damage in low carbon structural steel have been characterized using magnetic Barkhausen emission (MBE) signal analysis technique during high cycle fatiguing. The...
Magnetic characterization of cold rolled and aged AISI 304 stainless steel (2005)
Sagar, S., Ravi Kumar, B., Dobmann, G., Bhattacharya, D.
Magnetic easy axis predicted by the orientation distribution of the maximum amplitude of magnetic Barkhausen emission (MBE), which is obtained by magnetization in radial directions from the center of...
New window on strange quark matter as the ground state of strongly interacting matter (2004)
Soni, Vikram, Bhattacharya, D.
If strange quark matter is the true ground state of matter, it must have lower energy than nuclear matter. Simultaneously, two-flavor quark matter must have higher energy than nuclear matter, for...
Early optical and millimeter observations of GRB 030226 afterglow (2004)
Pandey, S.B., Sagar, R., Anupama, G.C., Bhattacharya, D., Sahu, D.K., Castro-Tirado, A.J., ...
The CCD magnitudes in Johnson UBV and Cousins RI photometric passbands for the afterglow of the long duration GRB 030226 are presented. Upper limits of a few mJy to millimeter wave emission at the...
Prototype TIGRE compton gamma-ray balloon-borne telescope (2004)
Bhattacharya, D, O'Neill, T J, Akyuz, A, Samimi, J, Zych, A D
A prototype balloon-borne telescope is being constructed for gamma-ray observations in the MeV energy range. The Tracking and Imaging Gamma-Ray Experiment (TIGRE) uses multi-layers of thin silicon...
Synthesis and sintering characteristics of Y–Ba–Cu-oxide superconductors (2004)
Pathak, L C, Mishra, S K, Bhattacharya, D, Chopra, K L
Y–Ba–Cu-Oxide (YBCO) powder were prepared by three different techniques and the isothermal sintering characteristics of the synthesized powder were systematically investigated using a...
Early optical and millimeter observations of GRB 030226 afterglow (2004)
Pandey, S. B, Sagar, R, Anupama, G. C, Bhattacharya, D, Sahu, D. K, Castro-Tirado, A. J, ...
The CCD magnitudes in Johnson UBV and Cousins RI photometric passbands for the afterglow of the long duration GRB 030226 are presented. Upper limits of a few mJy to millimeter wave emission at the...
Early optical and millimeter observations of GRB 030226 afterglow (2003)
Pandey, S. B., Sagar, R., Anupama, G. C., Bhattacharya, D., Sahu, D. K., Castro-Tirado, A. J., ...
The CCD magnitudes in Johnson $UBV$ and Cousins $RI$ photometric passbands for the afterglow of the long duration GRB 030226 are presented. Upper limits of a few mJy to millimeter wave emission at...
The optical afterglow of the not so dark GRB 021211 (2003)
Pandey, S.B., Anupama, G.C., Sagar, R., Bhattacharya, D., Castro-Tirado, A.J., Sahu, D.K., ...
We determine Johnson B,V and Cousins R,I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been...
Optical afterglow of the not so dark GRB 021211 (2003)
Pandey, S. B., Anupama, G. C., Sagar, R., Bhattacharya, D., Castro-Tirado, A. J., Sahu, D. K., ...
We determine Johnson $B,V$ and Cousins $R,I$ photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been...
SN 2002ap, the hypernova of class Ic (2003)
Pandey, S. B., Sahu, D. K., Anupama, G. C., Bhattacharya, D., Sagar, Ram
The supernova SN 2002ap was discovered in the outer regions of the nearby spiral M74 on January 29.4 UT. Early photometric and spectroscopic observations indicate the supernova belongs to the class...
A flattening in the optical light curve of SN 2002ap (2003)
Pandey, S.B., Anupama, G.C., Sagar, R., Bhattacharya, D., Sahu, D.K., Pandey, J.C.
Restricted Access. An open access version is available at NASA ADS (alternative location).
A dynamic sky simulation for the scanning sky monitor on ASTROSAT (2003)
Mishra, Sushila Devi, Bhattacharya, D.
Presented at the 22nd meeting of the Astronomical Society of India, Thiruvananthapuram, 2003.
Image reconstruction for a continuously rotating coded mask camera (2003)
Ravi Shankar, B.T., Bhattacharya, D.
Presented at the 22nd meeting of the Astronomical Society of India, Thiruvananthapuram, 2003.
Evolution of an afterglow with a hard electron spectrum (2003)
Diffusive shock acceleration theory suggests that the ``universal'' energy spectrum of electrons with a power-law index p approximately equal to 2.3, commonly used to model GRB afterglows, cannot...
Optical observations of the bright long duration peculiar GRB 021004 afterglow (2003)
Pandey, SB, Sahu, DK, Resmi, L, Sagar, R, Anupama, GC, Bhattacharya, D, ...
The CCD magnitudes in Johnson $B,V$ and Cousins $R$ and $I$ photometric passbands are determined for the bright long duration GRB 021004 afterglow from 2002 October 4 to 16 starting $\sim$ 3 hours...
Optical observations of the bright long duration peculiar GRB 021004 afterglow (2003)
Pandey, S.B., Sahu, D.K., Resmi, L., Sagar, R., Anupama, G.C., Bhattacharya, D., ...
The CCD magnitudes in Johnson $B,V$ and Cousins $R$ and $I$ photometric passbands are determined for the bright long duration GRB 021004 afterglow from 2002 October 4 to 16 starting $\sim$ 3 hours...
SN 2002ap, the hypernova of class Ic (2003)
Pandey, S.B., Sahu, D.K., Anupama, G.C., Bhattacharya, D., Sagar, R.
The supernova SN 2002ap was discovered in the outer regions of the nearby spiral M74 on January 29.4 UT. Early photometric and spectroscopic observations indicate the supernova belongs to the class...
Energy and radiation spectrum of electrons in ultra-relativistic shocks of GRB afterglows (2003)
We consider particle acceleration near ultra relativistic shocks (shock p 1) and the distribution of accelerated particles in the shock downstream. We suggest that the electron energy spectrum will...
A Flattening in the Optical Light Curve of SN 2002ap (2003)
Pandey, S. B, Anupama, G. C, Sagar, R, Bhattacharya, D, Sahu, D. K, Pandey, J. C
The optical afterglow of the not so dark GRB 021211 (2003)
Pandey, S. B, Anupama, G. C, Sagar, R, Bhattacharya, D, Castro-Tirado, A. J, Sahu, D. K, ...
We determine Johnson B,V and Cousins R,I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been...