On 17 August 2009, INTEGRAL caught another long Gamma-Ray Burst (GRB) in the field of view of IBIS/ISGRI. This one was special as it was also in the smaller field of view of the X-ray monitor JEM-X 1 and (almost) of the optical camera OMC. |
---|
Usually not all the data of OMC are downloaded from the satellite to the ground, but in case of a GRB in its field of view, a command is sent to the spacecraft to download the data around the burst position. This worked fine. But OMC was unlucky again (see INTEGRAL Picture of the Month of July 2005) - the burst was just outside its detector area. This is illustrated in the image to the left showing the IBIS/ISGRI error circle ontop of the OMC image.
Nevertheless GRB 090817 provides a lot of data to analyse. Both the IBIS/ISGRI and the JEM-X 1 light curves show two prominent peaks and a comparably long duration of about 250 seconds. The combined INTEGRAL spectrum covers the whole range of a gamma-ray burst, from 3 keV to several hundreds of keV, but, unluckily, not simultaneously the optical range. Other observations of this GRB were reported and can be accessed on the GCN site.
by Volker Beckmann on 2009-08-18 | >> INTEGRAL science results | >> All science results |