Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the neutrino non-detection of GRB 130427A   The recent gamma-ray burst GRB 130427A has an isotropic electromagnetic
energy $E^{iso}\sim10^{54}$ erg, suggesting an ample supply of target photons
for photo-hadronic interactions, which at its low redshift of $z\sim0.34$ would
appear to make it a promising candidate for neutrino detection. However, the
IceCube collaboration has reported a null result based on a search during the
prompt emission phase. We show that this neutrino non-detection can provide
valuable information about this GRB's key physical parameters such as the
emission radius $R_{d}$, the bulk Lorentz factor $\Gamma$ and the energy
fraction converted into cosmic rays $\epsilon_{p}$. The results are discussed
both in a model-independent way and in the specific scenarios of an internal
shock model (IS), a baryonic photospheric model (BPH) and magnetic photospheric
model (MPH). We find that the constraints are most stringent for the magnetic
photospheric model considered, but the constraints on the internal shock and
the baryonic photosphere models are fairly modest.

13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph