“…Therefore, the peaks of 14 C and 10 Be may have different origins, which challenges the SPE origin. Meanwhile, there are also several problems with the interpretation of these 14 C events as SPEs 13,17,18 , including no definite historic records of strong aurorae or sunspots around AD 775 and AD 994 19,20 , the inferred solar fluence (>30 MeV) value is inconsistent with the occurrence probability distribution for SPEs 21,22 , and whether the Sun can produce such large proton events is still debated 23 Meanwhile, gamma-ray photons produced by high-energy explosions can also generate 14 C events, such as supernovae 1, 3 , short gamma-ray bursts 24,25 , and pulsar outbursts 18 . A supernova remnant, named Vela Jr., has an age of t = 2, 000 − 13, 000 yr at a distance less than 400 parsecs 26 , which is a promising candidates to cause the BC 3371 event.…”