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

2 30 (29?) GRBs detected by BATSE, HETE, IPNApproximately 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 $GusUL

5 Converting counts to a erg/cm^2/sLet 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 (Flux is given in erg cm^-2) $Cts2Flx Effective Area: e-06

7

8 Results: Upper Limits on the fluxJulie's

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