Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On The Missing Counterparts Of LIGO-Virgo Binary Merger Events   Despite world-wide ground, underground, and space based observations in
search of anticipated electromagnetic and perhaps neutrino counterparts to the
29 compact binary merger events, which have been detected by the upgraded
LIGO-Virgo gravitational wave detectors in the first half year of their
observation period O3, no such counterparts were found. Although such a
situation could be due to a poor localization of nearby merger events and/or a
complex background of short extragalactic transients, it could be intrinsic. We
show that, indeed, it is expected in the cannonball model of gamma ray bursts
and their afterglows.

4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th