View Full Version : Scale of Clarke Burst

2012-Mar-21, 11:19 AM
Post Edit by Admin: "The Clarke Burst" is a sometimes-used term for GRB 080319B, which was detected by cameras, and was technically in the range of visibility to humans lucky enough to be looking in the right direction at the right second under dark enough skies.

How bright exactly was Clarke Burst?

The top magnitude has variously been quoted as +5,4 and +5,8.

What is the distance modulus?
2,5 Gpc means something like 42. But that is from distance alone, without Tolman dimming. What is the real distance modulus?

In any case, Clarke Burst was brighter than -36.

It lasted less than a minute - on Earth. How long was it at source?

For comparison, one month is over 40 000 minutes. 1 month of -24,5 is as much energy as 1 minute at -36. 1 month is typical duration of a supernova peak - but supernova magnitudes are typically under -20.

100 million months is around 8 million years. 1 month of -24,5 is as much energy as -4,5 for 8 million year. Which is what a typical OB star emits over its whole history.

But so far it is only visible light - the band between 400 and 800 nm (or 1,5 and 3 eV).

Clarke Burst was called a "gamma ray" burst. How did the actual total energy of the gamma rays compare against the energy of light (and infrared)?

Note that the Milky Way blocks all far UV from Lyman edge (91 nm) to somewhere beyond 10 nm. Do we have any idea as to how much far UV energy was emitted by Clarke Burst?