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
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NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USANASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Barthelmy, SD
Barbier, LM
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Barbier, LM
Cummings, JR
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Cummings, JR
Fenimore, EE
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Fenimore, EE
Gehrels, N
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Gehrels, N
Hullinger, D
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Hullinger, D
Krimm, HA
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Krimm, HA
Markwardt, CB
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Markwardt, CB
Palmer, DM
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Palmer, DM
Parsons, A
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Parsons, A
Sato, G
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Sato, G
Suzuki, M
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Suzuki, M
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Takahashi, T
Tashiro, M
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Tashiro, M
Tueller, J
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
机构:
NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USANASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Barthelmy, SD
Barbier, LM
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Barbier, LM
Cummings, JR
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Cummings, JR
Fenimore, EE
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Fenimore, EE
Gehrels, N
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Gehrels, N
Hullinger, D
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Hullinger, D
Krimm, HA
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Krimm, HA
Markwardt, CB
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Markwardt, CB
Palmer, DM
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Palmer, DM
Parsons, A
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Parsons, A
Sato, G
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Sato, G
Suzuki, M
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Suzuki, M
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Takahashi, T
Tashiro, M
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA
Tashiro, M
Tueller, J
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机构:NASA, Goddard Space Flight Ctr, High Energy Phys Lab, Greenbelt, MD 20771 USA