Further Analysis of GRB ML0001:

I have modified my untriggered burst search code to look for single GRBs of known start time and relatively unknow direction.

In the process I have confirmed what Julie and Isabel presented at the collaboration meeting and I have also found something else that is very interesting.

I use a square bin, the original bin size was chosen to have the same area as the round bin used by Julie. 

The square bin has dimensions 2.8 x 2.8/cos(DEC).  I search on a 0.1 x 0.1 degree map

The first plot shows the number of signal versus RA and DEC. (The background has been subtracted).

Next is the Probability Map (-Log10 Prob vs. RA and DEC).

Then I opened up the angular bin to minimize the probability.  Below is a map of the actual events in the sky.

I then searched in time around the time of the burst.  My original search was +- 100 seconds in 8 second bins. 

Below I show the results for +- 1000 seconds around the burst time.

The second burst starts 32 seconds after the original start time and also lasts for 8 seconds.

The probability (pretrial is 17 events with 5.1 expected ~ 2x10-5).

Below I show the distribution of events on the sky for the second burst and then for the two time periods together.

I have also made some maps using Gaussian weighting.  There is no background subtraction here.  I used the weights based on the DELANGLE stuff Andy showed at the meeting.

PDF File for original burst.  This is a color plot.

PDF File for second burst.  This is a color plot.

PDF file for sum of bursts.  This is a color lego plot.

Below I list all the events in the two bursts.