What astronomical object emerges sometimes from supernova instead of a black hole?

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
A magnetar is a type of neutron star with an extremely powerful magnetic field. The magnetic field decay powers the emission of high-energy electromagnetic radiation, particularly X-rays and gamma rays. As of March 2016, only 23 magnetars are known, with six more candidates awaiting confirmation.
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Answers by country

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
answers
flagPakistan
61%
7%
7%
23%
13
flagAustria
42%
0%
28%
21%
14
flagGermany
41%
13%
29%
14%
75
flagthe United Kingdom
38%
4%
47%
9%
21
flagIndia
35%
7%
40%
16%
105
flagAustralia
33%
0%
58%
8%
12
flagPoland
26%
12%
41%
19%
2802
flagthe United States
25%
3%
51%
19%
31
flagGreece
15%
15%
38%
30%
13