J/ApJ/955/142ivo://CDS.VizieR/J/ApJ/955/142doi:10.26093/cds/vizier/ba-xv-4eCDSZhang Y.-K.Li DiZhang B.Cao S.Feng YiWang W.-Y.Qu Y.,Niu J.-R.Zhu W.-W.Han J.-L.Jiang P.Lee K.-J.Li D.-Z.Luo R.,Niu C.-H.Tsai C.-W.Wang P.Wang F.-Y.Wu Z.-W.Xu H.Yang Y.-P.,Zhang J.-S.Zhou D.-J.Zhu Y.-H.2026-07-02T12:00:44Z2026-01-07T12:36:22ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-sourcestransient-sourcespolarimetryWe report the observations of FRB 20220912A using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We conducted 17 observations totaling 8.67hr and detected a total of 1076 bursts with an event rate up to 390hr^-1^. The cumulative energy distribution can be well described using a broken power-law function with the lower- and higher-energy slopes of -0.38{\pm}0.02 and -2.07{\pm}0.07, respectively. We also report the L-band (1-1.5GHz) spectral index of the synthetic spectrum of FRB 20220912A bursts, which is -2.6{\pm}0.21. The average rotation measure value of the bursts from FRB 20220912A is -0.08{\pm}5.39rad/m^2^, close to 0rad/m^2^ and was relatively stable over 2 months. Most bursts have nearly 100% linear polarization. About 45% of the bursts have circular polarization with Signal-to-Noise ratio >3, and the highest circular polarization degree can reach 70%. Our observations suggest that FRB20220912A is located in a relatively clean local environment with complex circular polarization characteristics. These various behaviors imply that the mechanism of circular polarization of FRBs likely originates from an intrinsic radiation mechanism, such as coherent curvature radiation or inverse Compton scattering inside the magnetosphere of the FRB engine source (e.g., a magnetar).2023ApJ...955..142Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/955/142CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/other/PASA/33.45 : FRBCAT: The Fast Radio Burst Catalog (Petroff+, 2016)J/ApJ/888/40 : Fast radio bursts with AstroSat/CZTI (Anumarlapudi+, 2020)J/ApJS/257/59 : First CHIME/FRB Fast Radio Burst Cat. (CHIME/FRB Col.+, 2021)J/ApJ/922/115 : Additional bursts at 1.4GHz for FRB 121102 (Aggarwal+, 2021)J/other/Nat/598.267 : List of radio bursts (Li+, 2021)J/MNRAS/500/655 : Gal. DM contribution to the extragalactic FRBs (Das+, 2021)J/MNRAS/509/1227 : Hidden repeating fast radio bursts (Chen+, 2022)J/MNRAS/511/1961 : New CHIME/FRB I catalog updates released (Hashimoto+, 2022)J/A+A/675/A99 : FRBs search with Fermi-LAT (Principe+, 2023)J/AJ/168/153 : Image-based blind search for FRBs in MWA 8yrs (Kemp+, 2024)J/A+A/693/A279 : The Apertif fast radio burst sample (Pastor-Marazuela+, 2025)J/A+A/698/A18 : Selected CHIME FRB sample (Zhang+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/955/142https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/955/142http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/955/142https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/955/142https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/955/142http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/955/142GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/955/142/table1The properties of the FRB 20220912A burstsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/1075] Burst IDmeta.id;meta.mainintMJD[59880.4/59935.4] Modified Julian Date (JD-2400000.5) (1)dtime.epochdoubleDM[212/230] Dispersion measurepc.cm**-3phys.dispMeasurefloate_DM[0.03/8.2] Uncertainty in DMpc.cm**-3stat.error;phys.dispMeasurefloatFluxPk[16.4/12251] Peak Flux, calculated within 500MHz bandwidthmJyphot.flux.density;em.radio.750-1500MHzfloate_FluxPk[0.2/151] Flux UncertaintymJystat.error;phot.flux.density;em.radio.750-1500MHzfloatEW[0.09/33] Equivalent widthmssrc.var.pulsefloatFreqPk[868/1622] Peak Frequency obtained with Gaussian fittingMHzem.freqfloate_FreqPk[1.4/647] Uncertainty in PeakFreqMHzstat.error;em.freqfloatBandWidth[28/1147] FWHM of Gaussian fittingMHzinstr.bandwidthfloate_BandWidth[3/38964] Uncertainty in BandWidthMHzstat.error;instr.bandwidthfloatFluence[0.002/38] Fluence, calculated within 500MHz bandwidthJy.msphot.fluence;em.radio.750-1500MHzfloate_Fluence[0/0.5] Uncertainty in FluenceJy.msstat.error;phot.fluence;em.radio.750-1500MHzfloatE[0.13/2723] Energy, 10+36erg1e+29Jphys.energyfloatRM[-122.1/79.5] Rotation measurerad.m**-2phys.polarization.rotMeasurefloate_RM[0/218] Lower uncertainty in RMrad.m**-2stat.error;stat.min;phys.polarization.rotMeasurefloatE_RM[0/167] Upper uncertainty in RMrad.m**-2stat.error;stat.max;phys.polarization.rotMeasurefloatLPol[27/243] Linear polarization degree%phys.polarization.linearfloate_LPol[0/106] Uncertainty in LPol%stat.error;phys.polarization.linearfloatCPol[-130/71.4] Circular polarization degree%phys.polarization.circularfloate_CPol[0/76] Uncertainty in CPol%stat.error;phys.polarization.circularfloat