Some important discoveries in the pre-Swiftera > 1993: sub-classes(Kouveliotou et al.) >1994: MeV-GeV emission from GRB 940217 (Hurley et al ) 200 MeVemission from GRB 941017(Gonzalezet al 2003) 1997: detection of the iron lines in the X-ray afterglow of GRB 970508( Piro et al.) > 1999: optical flash and broken ligh curve of the r-band afterglow of Grb 990123(Akerlofet al fruchter et al. Kulkarniet al > 2002: X-ray flashes(Heiseet al Kippen et al.) > 2005: X-ray flares of GRBs(Piro et al.)Some important discoveries in the pre-Swift era ➢ 1993: sub-classes (Kouveliotou et al.) ➢ 1994: MeV-GeV emission from GRB 940217 (Hurley et al.)； 200 MeV emission from GRB 941017 (Gonzalez et al. 2003) ➢ 1997: detection of the iron lines in the X-ray afterglow of GRB 970508 (Piro et al.) ➢ 1999: optical flash and broken ligh curve of the R-band afterglow of GRB 990123 (Akerlof et al.; Fruchter et al.; Kulkarni et al.) ➢ 2002: X-ray flashes (Heise et al.; Kippen et al.) ➢ 2005: X-ray flares of GRBs (Piro et al.)