Testing the External Shock Model of Gamma-Ray Bursts using the Late-Time Simultaneous Optical and X-ray Afterglows

We study the ``normal'' decay phase of the X-ray afterglows of gamma-ray bursts (GRBs), which follows the shallow decay phase, using the events simultaneously observed in the R-band. The classical external shock model -- in which neither the delayed energy injection nor time-dependency of shock micro-physics is considered -- shows that the decay indices of the X-ray and R-band light curves, $\alpha_{\rm X}$ and $\alpha_{\rm O}$, obey a certain relation, and that in particular, $\alpha_{\rm O}-\alpha_{\rm X}$ should be larger than -1/4 unless the ambient density increases with the distance from the central engine. For our selected 14 samples, we have found that 4 events violate the limit at more than the 3$\sigma$ level, so that a fraction of events are outliers of the classical external shock model at the ``normal'' decay phase.Comment: Accepted for publication in ApJL. 12 page, 2 figures, 2 table

Identification and Isolation Pattern of Globisporangium spp. from a Sanionia Moss Colony in Ny-Ålesund, Spitsbergen Is., Norway from 2006 to 2018

application/pdfMicroorganisms. 2021, 9 (9), P.1912(1-13)journal articl

Inclusive Measurement of the Photon Energy Spectrum in b→sγ Decays

journal articl

Time-Dependent CP-Violating Asymmetry in B^0→p^0γ Decays

We report the first measurement of CP-violation parameters in B^0 → p^0γ decays based on a data sample of 657×10^6B\bar{B} pairs collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain the time-dependent and direct CP-violating parameters, S_p0γ=-0.83±0.65(stat)±0.18(syst) and A_poγ= -0.44±0.49(stat)±0.14(syst), respectively.journal articl

Gazavât-ı Sultân Murâd b. Mehemmed Hân : İzladi ve Varna savaşları (1443-1444) üzerinde anonim Gazavâtnâme /

Includes bibliographical references and index.Kaçar, Hilm

An economic and social history of the Ottoman empire /

1. 1300-16002. 1600-191

Fatih devri üzerinde tetkikler ve vesikalar /

Includes bibliographical references and index.Yunus Emre InstituutYunus Emre Instituu