A method to localize gamma-ray bursts using POLAR

被引:16
作者
Suarez-Garcia, E. [1 ,2 ]
Haas, D. [1 ,2 ]
Hajdas, W. [4 ]
Lamanna, G. [3 ]
Lechanoine-Leluc, C. [1 ]
Marcinkowski, R. [5 ]
Mtchedlishvili, A. [4 ]
Orsi, S. [1 ]
Pohl, M. [1 ]
Produit, N. [2 ]
Rapin, D. [1 ]
Rybka, D. [5 ]
Vialle, J-P [3 ]
机构
[1] Univ Geneva, DPNC Quai Ernest Ansermet 24, CH-1205 Geneva, Switzerland
[2] INTEGRAL Sci Data Ctr, CH-1290 Versoix, Switzerland
[3] Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France
[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[5] Andrzej Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
关键词
Gamma ray burst; Source localization; Polarization; POLAR; GRB; 041219A; CHI-SQUARE; POLARIZATION; EMISSION; POLARIMETER; AFTERGLOWS; ASTRONOMY; RHESSI;
D O I
10.1016/j.nima.2010.10.006
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The hard X-ray polarimeter POLAR aims to measure the linear polarization of the 50-500 key photons arriving from the prompt emission of gamma-ray bursts (GRBs) The position in the sky of the detected GRBs is needed to determine their level of polarization We present here a method by which despite of the polarimeter incapability of taking images GRBs can be roughly localized using POLAR alone For this purpose scalers are attached to the output of the 25 multi-anode photomultipliers (MAPMs) that collect the light from the POLAR scintillator target Each scaler measures how many GRB photons produce at least one energy deposition above 50 key in the corresponding MAPM Simulations show that the relative outputs of the 25 scalers depend on the GRB position A database of very strong GRBs simulated at 10 201 positions has been produced When a GRB is detected its location is calculated searching the minimum of the chi(2) obtained in the comparison between the measured scaler pattern and the database This GRB localization technique brings enough accuracy so that the error transmitted to the 100% modulation factor is kept below 10% for GRBs with fluence F-tot >= 10(-5) erg cm(-2) The POLAR localization capability will be useful for those cases where no other instruments are simultaneously observing the same field of view (C) 2010 Elsevier B V All rights reserved
引用
收藏
页码:624 / 634
页数:11
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