Last night, what is likely the brightest gamma-ray burst (extragalactic) ever detected in the history of mankind occurred. It was a long, highly complex event which triggered the SPI/ACS detector on the INTEGRAL satellite three times:
(click on the image boxes on the left to get a more expanded view of the three episodes)
The third of these episodes also triggered the GBM detector of the Fermi satellite (the first two occurred while the satellite was traversing a space regions where triggers are disabled...). The report from the Fermi team on the GBM observation (http://gcn.gsfc.nasa.gov/gcn3/13377.gcn3) gives a fluence of 9 x 10^-3 erg cm^-2 and a peak photon flux of 850 ph cm^-2 s^-1. The first value is unprecedented, so far, the brightest GRBs ever were GRBs 830801B and 840304, with 2-3 x 10^-3 erg cm^-2 (the famous "naked-eye burst" GRB 080319B reached 6 x 10^-4).
The GRB was also significantly detected by the Large Area Telescope aboard Fermi, which yielded a position RA(J2000) = 170.73 deg, Dec(J2000) = 9.48 deg with an error of 0.45°. (http://gcn.gsfc.nasa.gov/gcn3/13379.gcn3)
This position is observable at the beginning of the night for one or two hours, depending on where you are. Northern observers are disfavored due to the long twilight. Also, it is about 10 degrees from the Moon, but lunar separation is increasing.
If any of you have large amateur telescopes (12" or above) equipped with CCDs and reasonably large FOVs (1° or so), I encourage you to observe this position.