Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inter-Calibration of Atmospheric Cherenkov Telescopes with UAV-based
  Airborne Calibration System   The recent advances in the flight capability of remotely piloted aerial
vehicles (here after referred to as UAVs) have afforded the astronomical
community the possibility of a new telescope calibration technique: UAV-based
calibration. Building upon a feasibility study which characterised the
potential that a UAV-based calibration system has for the future Cherenkov
Telescope Array, we created a first-generation UAV-calibration prototype and
undertook a field-campaign of inter-calibrating the sensitivity of the H.E.S.S.
telescope array with two successful calibration flights. In this paper we
report the key results of our first test campaign: firstly, by comparing the
intensity of the UAV-calibration events, as recorded by the individual HESS-I
cameras, we find that a UAV-based inter-calibration is consistent with the
standard muon inter-calibration technique at the level of \SI{5.4}{\%} and
\SI{5.8}{\%} for the two individual UAV-calibration runs. Secondly, by
comparing the position of the UAV-calibration signal on the camera focal plane,
for a variety of telescope pointing models, we were able to constrain the
pointing accuracy of the HESS-I telescopes at the tens of arc-second accuracy
level. This is consistent with the pointing accuracy derived from other
pointing calibration methods. Importantly both the inter-calibration and
pointing accuracy results were achieved with a first-generation UAV-calibration
prototype, which eludes to the potential of the technique and highlights that a
UAV-based system is a viable calibration technique for current and future
ground-based $\gamma$-ray telescope arrays.

22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol