1. Milagro upper limits on Satellite-triggered GRBs
Pablo Saz Parkinson
Los Alamos, 7-8 March 2004

2. 30 (29?) GRBs detected by BATSE, HETE, IPN
Approximately 1/3 of well-localized GRBs
3 with known z: (2.01), (.45), (1.01)
Used no X2 cut, nfit>20, 1.6 degree circular bin
Analysed REC data from /data/links/bydate

3. GRB010921

4. Time of GRB (TJD,UTC): 2173,
Duration of burst: 12 s
Location of burst: -16,40.93 (1641,710)
Zenith Angle:
Bin Radius: 1.6 degrees
GRB Flux: 28
GRB Bckgd:
Net Signal:
Li-Ma Sig.:
Peak Flux Location: ,42.15 (1631,722)
Peak Flux: 39
Bckgnd:
Net Peak:
Li-Ma Sig.:
$GusUL
Usage: GusUL <verbose?> <alpha> <CL> <Nobs> <B0>
$GusUL

5. Converting counts to a erg/cm^2/s
Let Ncounts = Integral from 0.1 to 100 TeV of a power-law of index
a (e.g. a=-2.4)
Find normalization
Using normalization, integrate
power-law of index a+1 in desired
range (e.g. 0.2 – 20.0) to get
the fluence.
Convert to ergs and divide
by the effective area and duration
of the burst.

6. Converting from counts to flux
$ Cts2Flx
Usage: Cts2Flx <zenith_angle> <index> <lo_lim> <hi_lim> <Counts>
(Flux is given in erg cm^-2)
$Cts2Flx
Effective Area:
e-06

8. Results: Upper Limits on the flux
Julie's

9. Things to check/Questions:
Duration of bursts
Effective area
Data (do we need to re-construct the data?)
My GRB Analysis code