Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Taxonomy of GRB optical light-curves: identification of a salient class
  of early afterglows   The temporal behaviour of the early optical emission from Gamma-Ray Burst
afterglows can be divided in four classes: fast-rising with an early peak,
slow-rising with a late peak, flat plateaus, and rapid decays since first
measurement. The fast-rising optical afterglows display correlations among peak
flux, peak epoch, and post-peak power-law decay index that can be explained
with a structured outflow seen off-axis, but the shock origin (reverse or
forward) of the optical emission cannot be determined. The afterglows with
plateaus and slow-rises may be accommodated by the same model, if observer
location offsets are larger than for the fast-rising afterglows, or could be
due to a long-lived injection of energy and/or ejecta in the blast-wave. If
better calibrated with more afterglows, the peak flux-peak epoch relation
exhibited by the fast and slow-rising optical light-curves could provide a way
to use this type of afterglows as standard candles.

7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math