Pi of the Sky robotic observatories in Chile and Spain

PioftheSkyrob oticatories observinChileandSpainA.Cwiek,aL.Mankiewicz,bT.h, BatscCastro-Tirado,cH.wski, o CzyrkdM.Cwiok,R.wski,DabrodM.nek,  JelcG.wicz,KasproeA.Ma her, jcaK.Malek,f,bwro ki, Na cL.Obara,dR.Opiela,bW.wski,Piotrog,dM.Siudek,wski, olo Sokh,i,awrzaszek,a WjG.ro hna, c WaM.ba, ZaremdA.F._ki ZarnecaNationaltre CenforNuclearh, Researcza Ho _69,00-681w, arsa Woland. Pbter CenforTheoreticalysics Phoftheolish Py AcademSciences,Al.w o Lotnik32/46,02-668w, arsa Woland. PcInstitutodesica  Astrofa  AndalucCSIC,GlorietadelaAstronomia,s/n,E-18080Granada,Spaindy acult Fofysics, Phy ersit Univw, arsa Wza Ho _69,00-681oland. PeInstituteofElectronicSystems,w arsa Wy ersit Univ, hnology ec Ta wiejsk o w No15/19,00-665w, arsa Woland. PfDivisionofarticles PandysicalAstrophScience,a y Nago, y ersit Univho, uro-c FChikusa-ku,464-8601a, y NagoJapan.gRIKEN,2-1a, w Hirosao, ak W351-0198Saitama,Japan.hternationalIntre CenforRadioy Astronomh Researc-Curtin, y ersit UnivGPOx BoU1987,erth, PA W6845,Australia.iC ARtre CenofExcellenceforAll-skyysicsAstrophO).(CAASTRjSpaceh Researcter Cenoftheolish Py AcademSciences,a k yc Bart18A,00-716w, arsa Woland. PCT ABSTRAThePioftheSkyisasystemwide eldviewrob otictelescop es,h whichsearcforshorttimescaleastro-ysicalphphenomena,esp eciallyforpromptopticalGRBemission.Thesystemas wdesignedautonomousop eration,monitoringalargefractionoftheskytodepth12m13andwithtimeresolutionor-derof110seconds.Thesystemdesignandation observstrategyere wsuccessfullytestedwithaypprotot edetectorop erationalatLasCampanas, atory ObservChilefrom2004-2009anded v motoSanedro PdetacamaAatory Observinh Marc2011.InOctob er2010the rstunitof nalPiSkydetectorsystem,with4CCDcameras,as wsuccessfullyinstalledattheA INTElArenosilloest TtreCeninSpain.InJuly2013threemoreunits(12CCDcameras)ere wcommissionedandinstalled,togetherwiththe rstone,onanewplatforminA, INTextendingskyeragev cotoab out6000squaredegrees.ords: KeywGRB,Rob otictelescop e,aralax,PPhotometriccorrections1.ODUCTIONINTRThe\PioftheSky"1isasystemwide eldviewrob otictelescop esdesignedfortecienhsearcastrophys-icalphenomenaarying vonscalesfromsecondstoths.monThedesignoftheapparatuswsallomonitoringofalargefractiontheskytodepth12m13andwithtimeresolutionorder110seconds.Themaingoalofthe\PiSky"pro jectistohsearcforandeobservpromptopticalterpartscounGammay RaBursts(GRBs)duringoren evb eforegamma-rayemission.o Te hievacthispurp ose\PioftheSky"selectedanapproachh whicassumesuoustinconation observofalargeparttheskytoincreasep ossibilityofhingcatcaGRB.Therefore,itas wnecessarytoelopdevanced advandfullyautomaticarehardware w softforwide- eldmonitoring,real-timedataanalysisandti cationidenofashes.Sendcorresp ondenceto:h@cft.edu.pllec