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Gallium selenide (GaSe) is an efficient nonlinear crystal for electro-optic (EO) sampling in the multi-terahertz (THz) frequency range. However, the lattice resonance at several THz frequencies hampers broadband EO sampling, resulting in…

We discuss the treatment of bandpass and beam leakage corrections in the Bayesian BeyondPlanck CMB analysis pipeline as applied to the Planck LFI measurements. As a preparatory step, we first apply three corrections to the nominal LFI…

The \emph{Swift} Burst Alert Telescope (BAT), operating in the 15--150 keV energy band, struggles to detect the peak energy ($E_{\rm p}$) of gamma-ray bursts (GRBs), as most GRBs have $E_{\rm p}$ values typically distributed between 200-300…

高能天体物理现象 · 物理学 2024-12-12 Liang Li , Yu Wang

We study statistically 197 long gamma-ray bursts, detected and measured in detail by the BATSE instrument of the Compton Gamma-Ray Observatory. In the sample 10 variables, describing for any burst the time behavior of the spectra and other…

天体物理学 · 物理学 2009-11-13 Z. Bagoly , L. Borgonovo , A. Meszaros , L. G. Balazs , I. Horvath

It is often stated that gamma-ray bursts (GRBs) have typical energies of several hundred keV. Is this a real feature of GRBs or is it due to an observational bias? We consider the possibility that bursts of a given bolometric luminosity…

天体物理学 · 物理学 2009-10-28 Tsvi Piran , Ramesh Narayan

We describe a Bayesian methodology to evaluate the consistency between the reported Ginga and BATSE detections of absorption features in gamma ray burst spectra. Currently no features have been detected by BATSE, but this methodology will…

A time-resolved spectral analysis for a sample of 22 intense, broad GRB pulses from the BATSE GRB sample is presented. We fit the spectra with the Band function and investigate the correlation between the observed flux (F) and the peak…

星系天体物理 · 物理学 2015-05-19 R. -J. Lu , S. -J. Hou , En-Wei Liang

Measurements of the polarization of radio emission are subject to a number of depolarization effects such as bandwidth depolarization, which is caused by the averaging effect of a finite channel bandwidth combined with the…

天体物理仪器与方法 · 物理学 2023-02-08 Maxwell A. Fine , Cameron L. Van Eck , Luke Pratley

The analysis of spectral lag between energy bands, which combines temporal and spectral analyses, can add strict constraints to gamma-ray burst (GRB) models. In previous studies, the lag analysis focused on the lags between channel 1 (25-57…

天体物理学 · 物理学 2009-10-31 Bobing Wu , Edward Fenimore

All gamma-ray bursts are observed to have approximately the same characteristic gamma-ray energy. We show in this article that for bursts in the BATSE data set, this property as measured by the E-peak value is not an instrumental effect,…

天体物理学 · 物理学 2007-05-23 J. J. Brainerd , G. Pendleton , R. Mallozzi , M. S. Briggs , R. D. Preece

A combined fit is performed to the BaBar and Belle measurements of the $\EE \to \phi \pi^+ \pi^-$ and $\phi \fzero$ cross sections for center-of-mass energy between threshold and 3.0 GeV. The resonance parameters of the $\phi(1680)$ and…

高能物理 - 实验 · 物理学 2015-05-14 C. P. Shen , C. Z. Yuan

We present a spectro-temporal analysis of 137 fast radio bursts (FRBs) from the first CHIME/FRB baseband catalog, including 125 one-off bursts and 12 repeat bursts, down to microsecond resolution using the least-squares optimization fitting…

We study the photoresponse of graphene field effect transistors using scanning photocurrent microscopy in near and far field configurations, and we find that the response of graphene under a source-drain bias voltage away from the contacts…

介观与纳米尺度物理 · 物理学 2015-02-11 Sameer Grover , Sudipta Dubey , John P. Mathew , Mandar M. Deshmukh

The spectral-energy and (luminosity) correlations in long GRBs are being hotly debated to establish, first of all, their reality against possible selection effects. These are best studied in the observer planes, namely the peak energy…

天体物理学 · 物理学 2009-11-13 Lara Nava , Giancarlo Ghirlanda , Gabriele Ghisellini , Claudio Firmani

We present fits to the broadband photometric spectral energy distributions (SEDs) of 158 eclipsing binaries (EBs) in the Tycho-2 catalog. These EBs were selected because they have highly precise stellar radii, effective temperatures, and in…

太阳与恒星天体物理 · 物理学 2016-12-07 Keivan G. Stassun , Guillermo Torres

In fluorescence diffuse optical tomography (fDOT), the reconstruction of the fluorophore concentration inside the target body is usually carried out using a normalized Born approximation model where the measured fluorescent emission data is…

We present a time-resolved spectral analysis of 51 long and 11 short bright GRBs observed with the {\em Femri}/GBM, paying special attention to $E_{\rm p}$ evolution within a same burst. Among 8 single-pulse long GRBs, 5 show hard-to-soft…

高能天体物理现象 · 物理学 2012-08-23 Rui-Jing Lu , Jun-Jie Wei , En-Wei Liang , Bin-Bin Zhang , Hou-Jun Lü , Lian-Zhong , , Wei-Hua Lei , Bing Zhang

The physical importance of the apparent discrepancy between the detections by pre-BATSE missions of absorption lines in gamma-ray burst spectra and the absence of a BATSE line detection necessitates a statistical analysis of this…

天体物理学 · 物理学 2009-10-30 D. L. Band , L. A. Ford , J. L. Matteson , M. S. Briggs , W. S. Paciesas , G. N. Pendleton , R. D. Preece

We consider the problem of detecting a burst signal of unknown shape. We introduce a statistic which generalizes the excess power statistic proposed by Flanagan and Hughes and extended by Anderson et al. The statistic we propose is shown to…

广义相对论与量子宇宙学 · 物理学 2009-11-07 Andrea Viceré

We perform a statistical analysis of the temporal and spectral properties of the latest Fermi gamma-ray bursts (GRBs) to revisit the classification of GRBs. We find that the bimodalities of duration and the energy ratio…

高能天体物理现象 · 物理学 2012-04-20 Fu-Wen Zhang , Lang Shao , Jing-Zhi Yan , Da-Ming Wei