Gamma-ray bursts (GRB) are the most luminous physical phenomena in the universe, consisting of flashes of
gamma rays that last from seconds to hours. In this paper we look at possible alternate scenarios for both short and long
duration GRBs. We consider scenarios for short duration GRBs,which could explainwhy fewer GRBs are observed than
what is expected. Also a new class of objects (dark matter objects) is proposed as possible candidate for short duration
GRBs which eliminates the baryon load problem, which could also provide a possible scenario for the formation of substellar
black holes, distinct from the usual Hawking black hole.We also consider a new model (dubbed the Smashnova
model)where an SN can trigger a GRB.In case of long duration GRBs, we propose the possibility of a GRB triggering the
collapse of a WR or RG star in a binary system producing an SN, and typical signatures. We also discuss GRBs from
population III stars of ~500 Mʘ at high redshifts,and argue that collapse of such high mass stars does not lead to GRBs.
Observational implications for the above scenarios are briefly explained.