Bortolami, MarcoRaffuzzi, NiccolòPagano, LucaPuglisi, GiuseppeAnand, AvinashBanday, AnthonyCampeti, PaoloGalloni, GiacomoLonappan, Anto IdicherianLópez-Caniego Alcarria, Marcoset al.2025-11-212025-11-212025Bortolami, M., Raffuzzi, N., Pagano, L., Puglisi, G., Anand, A., Banday, A. J., Campeti, P., Galloni, G., Lonappan, A. I., Monelli, M., Tomasi, M., Weymann-Despres, G., Adak, D., Allys, E., Aumont, J., Aurvik, R., Baccigalupi, C., Ballardini, M., Barreiro, R. B., … The LiteBIRD collaboration. (2025). First release of LiteBIRD simulations from an end-to-end pipeline. Journal of Cosmology and Astroparticle Physics, 2025(11), 042. https://doi.org/10.1088/1475-7516/2025/11/0421475-7516https://hdl.handle.net/11268/16496The LiteBIRD satellite mission aims at detecting Cosmic Microwave Background B modes with unprecedented precision, targeting a total error on the tensor-to-scalar ratio r of δr ∼ 0.001. Operating from the L2 Lagrangian point of the Sun-Earth system, LiteBIRD will survey the full sky across 15 frequency bands (34 to 448 GHz) for 3 years.The current LiteBIRD baseline configuration employs 4508 detectors sampling at 19.1 Hz to achieve an effective polarization sensitivity of 2 µK arcmin and an angular resolution of 31 arcmin (at 140 GHz). We describe the first release of the official LiteBIRD simulations, realized with a new simulation pipeline developed using the LiteBIRD Simulation Framework. This pipeline generates 500 full-sky simulated maps at a HEALPix resolution of Nside=512. The simulations include also one year of Time Ordered Data (TOD) for approximately one-third of LiteBIRD’s total detectors.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article10.1088/1475-7516/2025/11/042open accessCiencias del espacioAstrofísicaCosmologíaGoal 4: Quality educationGoal 9: Build resilient infrastructure, promote sustainable industrialization and foster innovationGoal 17: Partnerships