Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Da dama model ga asalin gamma-ray fashewa postulated cewa na farko fashewa na gamma haskoki ya kamata a bi da sannu a hankali fading watsi a tsawon zango halitta ta collisions tsakanin fashewa ejecta da interstellar gas. Wannan hasken da yake raguwa ana kiransa "afterglow". Binciken farko na wannan afterglow bai yi nasara ba, galibi saboda yana da wahala a lura da matsayin fashewa a tsawan igiyar ruwa nan da nan bayan fashewar farko. Nasarar ta zo ne a watan Fabrairun 1997 lokacin da tauraron dan adam BeppoSAX ya gano fashewar hasken gamma (GRB 970228) kuma lokacin da aka nuna kyamarar X-ray zuwa inda fashewar ta samo asali, ta gano faduwar fitowar X-ray. William Herschel Telescope ya gano wani nau'i mai haske mai haske bayan sa'o'i 20 bayan fashewa. Da zarar GRB ya ɓace, ɗaukar hoto mai zurfi ya sami damar gano wani galaxy mai nisa, mai nisa a wurin GRB kamar yadda aka nuna ta hanyar hasken gani. Saboda ƙarancin haske na wannan galaxy, ba a auna ainihin nisansa ba har tsawon shekaru. Bayan haka, wani babban nasara ya faru tare da taron na gaba da BeppoSAX ya rubuta, GRB 970508. An gano wannan a cikin sa'o'i huɗu da aka gano shi, hakan ya ba wa rukunin masu bincike damar soma lura da shi da wuri fiye da kowane fashewa da ya gabata. Hasken abu ya nuna wani jan ja na z = 0.835, yana sanya fashewar a nesa da kimanin shekaru biliyan 6 daga duniya. Wannan shi ne farkon ƙayyadadden ƙayyadadden nisa zuwa GRB, kuma tare da gano galaxy mai watsa shiri na 970228 ya tabbatar da cewa GRBs suna faruwa a cikin galaxies masu nisa. A cikin 'yan watanni, jayayya game da ma'aunin nisa ya ƙare: GRBs sune abubuwan da suka faru na galactic wanda ya samo asali a cikin galaxies mai haske a nesa mai nisa. A shekara mai zuwa, GRB 980425 ya biyo bayan wata rana ta hanyar supernova mai haske (SN 1998bw), daidai da wuri, yana nuna alamar haɗi tsakanin GRBs da mutuwar taurari masu yawa. Wannan fashewar ta ba da tabbaci na farko game da...  Tambaya: bayan wane lokaci ne ya fashe?
Sa'o'i 20