Low-frequency spectra of gamma-ray bursts
نویسندگان
چکیده
منابع مشابه
The spectra of short Gamma–Ray Bursts
We present the results of the spectral analysis of a sample of short bright γ–ray bursts (GRB) detected by BATSE and compare them with the average and time resolved spectral properties of long bright bursts. While the spectral parameters of short GRBs confirm, as expected from previous works based on the hardness ratio, that they are harder than long events, we find that this difference is main...
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Gamma-ray bursts, if they are generated in the process of interaction between relativistic strongly magnetized winds and an ambient medium, may be accompanied by very short pulses of low-frequency radio emission. The bulk of this emission is expected to be at the frequencies of ∼ 0.1 − 1 MHz and cannot be observed. However, the high-frequency tail of the low-frequency radio emission may reach a...
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The discovery (Liang & Kargatis 1996), that the peak energy of time-resolved spectra of gamma-ray burst (GRB) pulses decays exponentially with fluence, is analytically shown to imply that the time-integrated photon number spectrum of a pulse should have a unique shape, given by an underlying E behavior. We also show that the asymptotic low energy normalization of the time-integrated spectrum is...
متن کاملSmoothly Broken Power Law Spectra of Gamma-ray Bursts
A five-parameter expression for a smoothly broken power law is presented. It is used to fit Gamma-Ray Burst spectra observed by BATSE. The function is compared to previously used fourparameter functions, such as a sharply broken power law and the Band et al. (1993) function. The presented function exists as a WINGSPAN routine at http://www.astro.su.se/∼felix/wing.html
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We extend a previous work on the intrinsic spectral properties and energetics of GRBs with known redshift based on 12 BeppoSAX events by including in the sample a total of 10 more events detected either by BATSE, BeppoSAX or HETE–2. An indication of a trend of the total isotropic equivalent radiated energy, Erad, with redshift is found and, remarkably, the previously found relationship between ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1994
ISSN: 0004-637X,1538-4357
DOI: 10.1086/187523