Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MAGIC observation of Globular Cluster M13 and its millisecond pulsars   Based on MAGIC observations from June and July 2007, we present upper limits
to the E>140 GeV emission from the globular cluster M13. Those limits allow us
to constrain the population of millisecond pulsars within M13 and to test
models for acceleration of leptons inside their magnetospheres and/or
surrounding. We conclude that in M13 either millisecond pulsars are fewer than
expected or they accelerate leptons less efficiently than predicted.

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom