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
flagGermany
37%
11%
34%
17%
35
flagIndia
36%
4%
36%
22%
49
flagthe United Kingdom
30%
0%
60%
10%
10
flagPoland
24%
12%
42%
20%
2543
flagthe United States
20%
4%
54%
20%
24