Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MAGIC observations of variable very-high-energy gamma-ray emission from
  PKS1510-089 during May 2015 outburst   PKS1510-089 is a flat spectrum radio quasar located at a redshift of 0.36. It
is one of only a few such sources detected in very-high-energy (VHE, >100 GeV)
gamma rays. Though PKS1510-089 is highly variable at GeV energies, until
recently no variability has been observed in the VHE band. In 2015 May
PKS1510-089 showed a high state in optical and in the GeV range. A VHE
gamma-ray flare was detected with MAGIC at that time, showing the first
instance of VHE gamma-ray flux variability on the time scale of days in this
source. We will present the MAGIC results from this observation, discuss their
temporal and spectral properties in the multi-wavelength context and present
modelling of such emission in the external Compton scenario.

2
The categories of this paper are: math
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat