Zobrazeno 1 - 10
of 287
pro vyhledávání: '"Morris, D C"'
Autor:
Martone, R., Guidorzi, C., Mundell, C. G., Kobayashi, S., Cucchiara, A., Gomboc, A., Jordana, N., Laskar, T., Marongiu, M., Morris, D. C., Smith, R. J., Steele, I. A.
In the era of multi-messenger astronomy the exploration of the early emission from transients is key for understanding the encoded physics. At the same time, current generation networks of fully-robotic telescopes provide new opportunities in terms o
Externí odkaz:
http://arxiv.org/abs/1907.00630
Autor:
MacLachlan, G. A., Shenoy, A., Sonbas, E., Dhuga, K. S., Cobb, B., Ukwatta, T. N., Morris, D. C., Eskandarian, A., Maximon, L. C., Parke, W. C.
We have investigated the time variations in the light curves from a sample of long and short Fermi/GBM Gamma ray bursts (GRBs) using an impartial wavelet analysis. The results indicate that in the source frame, the variability time scales for long bu
Externí odkaz:
http://arxiv.org/abs/1201.4431
Autor:
Ukwatta, T. N., Dhuga, K. S., Morris, D. C., MacLachlan, G., Parke, W. C., Maximon, L. C., Eskandarian, A., Gehrels, N., Norris, J. P., Shenoy, A.
We have studied power density spectra (PDS) of 206 long Gamma-Ray Bursts (GRBs). We fitted the PDS with a simple power-law and extracted the exponent of the power-law (alpha) and the noise-crossing threshold frequency (f_th). We find that the distrib
Externí odkaz:
http://arxiv.org/abs/1011.4342
Autor:
Ukwatta, T. N., MacGibbon, Jane H., Parke, W. C., Dhuga, K. S., Rhodes, S., Eskandarian, A., Gehrels, N., Maximon, L., Morris, D. C.
Primordial Black Holes (PBHs), which may have been created in the early Universe, are predicted to be detectable by their Hawking radiation. The Fermi Gamma-ray Space Telescope observatory offers increased sensitivity to the gamma-ray bursts produced
Externí odkaz:
http://arxiv.org/abs/1003.4515
Autor:
Ukwatta, T. N., Dhuga, K. S., Parke, W. C., Sakamoto, T., Markwardt, C. B., Barthelmy, S. D., Cioffi, D. F., Eskandarian, A., Gehrels, N., Maximon, L., Morris, D. C.
We present the results of our study of the variability time scales of a sample of 27 long Swift Gamma-Ray Bursts (GRBs) with known redshifts. The variability time scale can help our understanding of fundamental GRB parameters such as the initial bulk
Externí odkaz:
http://arxiv.org/abs/0906.3193
Autor:
Ukwatta, T. N., MacGibbon, J. H., Parke, W. C., Dhuga, K. S., Eskandarian, A., Gehrels, N., Maximon, L., Morris, D. C.
Publikováno v:
AIP Conf.Proc.1133:440-442,2009
Primordial Black Holes (PBHs), which may have been created in the early Universe, are predicted to be detectable by their Hawking radiation. PBHs with an initial mass of 5.0 * 10^14 g should be expiring today with a burst of high energy particles. Ev
Externí odkaz:
http://arxiv.org/abs/0901.0542
Autor:
Evans, P. A., Beardmore, A. P., Page, K. L., Osborne, J. P., O'Brien, P. T., Willingale, R., Starling, R. L. C., Burrows, D. N., Godet, O., Vetere, L., Racusin, J., Goad, M. R., Wiersema, K., Angelini, L., Capalbi, M., Chincarini, G., Gehrels, N., Kennea, J. A., Margutti, R., Morris, D. C., Mountford, C. J., Pagani, C., Perri, M., Romano, P., Tanvir, N.
We present a homogeneous X-ray analysis of all 318 Gamma Ray Bursts detected by the X-ray Telescope on the Swift satellite up to 2008 July 23; this represents the largest sample of X-ray GRB data published to date. In Sections 2--3 we detail the meth
Externí odkaz:
http://arxiv.org/abs/0812.3662
Autor:
Morris, D. C., Smith, R. K., Markwardt, C. B., Mushotzky, R. F., Tueller, J., Kallman, T. R., Dhuga, K. S.
Publikováno v:
Astrophys.J.699:892-901,2009
We report on Suzaku observations of four unidentified sources from the INTEGRAL and Swift BAT Galactic plane surveys. All the sources have a large neutral hydrogen column density and are likely members of an emerging class of heavily absorbed high ma
Externí odkaz:
http://arxiv.org/abs/0808.3141
Autor:
Burrows, David N., Kennea, J. A., Abbey, A. F., Beardmore, A., Campana, S., Capalbi, M., Chincarini, G., Cusumano, G., Evans, P. A., Hill, J. E., Giommi, P., Goad, M., Godet, O., Moretti, A., Morris, D. C., Osborne, J. P., Pagani, C., Page, K. L., Perri, M., Racusin, J., Romano, P., Starling, R. L. C., Tagliaferri, G., Tamburelli, F., Tyler, L. G., Willingale, R.
Publikováno v:
Proc.SPIE Int.Soc.Opt.Eng.6686:668607,2007
We present science highlights and performance from the Swift X-ray Telescope (XRT), which was launched on November 20, 2004. The XRT covers the 0.2-10 keV band, and spends most of its time observing gamma-ray burst (GRB)afterglows, though it has also
Externí odkaz:
http://arxiv.org/abs/0803.1844
Publikováno v:
AIP Conf.Proc.1000:196-199,2008
We present a systematic survey of the temporal and spectral properties of all GRB X-ray afterglows observed by Swift-XRT between January 2005 and July 2007. We have constructed a catalog of all light curves and spectra and investigate the physical or
Externí odkaz:
http://arxiv.org/abs/0801.4749