Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM   The monitor of all-sky X-ray image (MAXI) Gas Slit Camera (GSC) on the
International Space Station (ISS) detected a gamma-ray burst (GRB) on 2009,
September 26, GRB\,090926B. This GRB had extremely hard spectra in the X-ray
energy range. Joint spectral fitting with the Gamma-ray Burst Monitor on the
Fermi Gamma-ray Space Telescope shows that this burst has peculiarly narrow
spectral energy distribution and is represented by Comptonized blackbody model.
This spectrum can be interpreted as photospheric emission from the low
baryon-load GRB fireball. Calculating the parameter of fireball, we found the
size of the base of the flow $r_0 = (4.3 \pm 0.9) \times 10^{9} \, Y^{\prime \,
-3/2}$ cm and Lorentz factor of the plasma $\Gamma = (110 \pm 10) \, Y^{\prime
\, 1/4}$, where $Y^{\prime}$ is a ratio between the total fireball energy and
the energy in the blackbody component of the gamma-ray emission. This $r_0$ is
factor of a few larger, and the Lorentz factor of 110 is smaller by also factor
of a few than other bursts that have blackbody components in the spectra.

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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: quant-ph