Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precursors of short gamma-ray bursts   We carried out a systematic search of precursors on the sample of short GRBs
observed by Swift. We found that ~8-10% of short GRBs display such early
episode of emission. One burst (GRB 090510) shows two precursor events, the
former ~13 s and the latter ~0.5 s before the GRB. We did not find any
substantial difference between the precursor and the main GRB emission, and
between short GRBs with and without precursors. We discuss possible mechanisms
to reproduce the observed precursor emission within the scenario of compact
object mergers. The implications of our results on quantum gravity constraints
are also discussed.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg