Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PIONIER: a status report   The visitor instrument PIONIER provides VLTI with improved imaging
capabilities and sensitivity. The instrument started routinely delivering
scientific data in November 2010, that is less than 12 months after being
approved by the ESO Science and Technical Committee. We recall the challenges
that had to be tackled to design, built and commission PIONIER. We summarize
the typical performances and some astrophysical results obtained so far. We
conclude this paper by summarizing lessons learned.

32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an