Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A peculiarly long-duration gamma-ray burst from binary neutron star
  merger   Some recent findings have shown that the duration of gamma-ray burst (GRB),
although crucially related to the GRB central engine time scale, is not
determinative in inferring the GRB origins in terms of their progenitors. In
this paper, we report a peculiarly long-duration gamma-ray burst, GRB 211211A,
that is associated with a kilonova in optical and near-infrared bands and is
therefore likely the result of a binary neutron star merger. The burst broadly
resembles the properties of GRB 060614 but with a much higher brightness in its
light curve and harder spectra in both the main and extended emission phases,
making it difficult to be explained as a short GRB with soft extended emission.
Such a genuinely long-duration GRB suggests that merger product is likely a
magnetar, which powers up the burst through magnetic and rotation energy for at
least $\sim 70$ seconds.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci