Milagro upper limits on Satellite-triggered GRBs

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Presentation transcript:

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

30 (29?) GRBs detected by BATSE, HETE, IPN Approximately 1/3 of well-localized GRBs 3 with known z: 000926 (2.01), 010921 (.45), 021211 (1.01) Used no X2 cut, nfit>20, 1.6 degree circular bin Analysed REC data from /data/links/bydate

GRB010921

Time of GRB (TJD,UTC): 2173,18950.6 Duration of burst: 12 s Location of burst: -16,40.93 (1641,710) Zenith Angle: 10.3596 Bin Radius: 1.6 degrees GRB Flux: 28 GRB Bckgd: 31.8574 Net Signal: -3.85738 Li-Ma Sig.: -0.675474 Peak Flux Location: -16.95,42.15 (1631,722) 1.41208 Peak Flux: 39 Bckgnd: 31.5787 Net Peak: 7.42126 Li-Ma Sig.: 1.21279 $GusUL Usage: GusUL <verbose?> <alpha> <CL> <Nobs> <B0> $GusUL 0 11.21 .999 28.0 31.86 19.9092

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.

Converting from counts to flux $ Cts2Flx Usage: Cts2Flx <zenith_angle> <index> <lo_lim> <hi_lim> <Counts> (Flux is given in erg cm^-2) $Cts2Flx 10.3596 2.4 0.2 20.0 19.9092 Effective Area: 552.426 1.28894e-06

Results: Upper Limits on the flux Julie's

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