Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Very high energy gamma rays from the direction of Sagittarius A*   We report the detection of a point-like source of very high energy (VHE)
gamma-rays coincident within 1' of Sgr A*, obtained with the H.E.S.S. array of
Cherenkov telescopes. The gamma-rays exhibit a power-law energy spectrum with a
spectral index of -2.2 +/- 0.09 +/- 0.15 and a flux above the 165 GeV threshold
of (1.82 +/- 0.22) * 10^-7 m^-2 s^-1. The measured flux and spectrum differ
substantially from recent results reported in particular by the CANGAROO
collaboration.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex