Cadmium–Zinc–Telluride Imager (CZTI) onboard AstroSat has been a prolific Gamma-Ray Burst (GRB) monitor. While the 2-pixel Compton scattered events (100–300 keV) are used to extract sensitive spectroscopic information, the inclusion of the low-gain pixels (\(\sim \)20\(\%\) of the detector plane) after careful calibration extends the energy range of Compton energy spectra to 600 keV. The new feature also allows single-pixel spectroscopy of the GRBs to the sub-MeV range which is otherwise limited to 150 keV. We also introduced a new noise rejection algorithm in the analysis (‘Compton noise’). These new additions not only enhances the spectroscopic sensitivity of CZTI, but the sub-MeV spectroscopy will also allow proper characterization of the GRBs not detected by Fermi. This article describes the methodology of single, Compton event and veto spectroscopy in 100–900 keV combined for the GRBs detected in the first year of operation. CZTI in last five years has detected \(\sim \)20 bright GRBs. The new methodologies, when applied on the spectral analysis for this large sample of GRBs, has the potential to improve the results significantly and help in better understanding the prompt emission mechanism.

AstroSat 上的镉-锌-碲化物成像仪 (CZTI) 是一款多产的伽马射线暴 (GRB) 监视器。虽然 2 像素康普顿散射事件 (100–300 keV) 用于提取敏感的光谱信息，但包含低增益像素（探测器平面的\(\sim \) 20 \(\%\)）之后仔细校准将康普顿能谱的能量范围扩展到 600 keV。新功能还允许 GRB 的单像素光谱达到亚 MeV 范围，否则限制为 150 keV。我们还在分析中引入了一种新的噪声抑制算法（“康普顿噪声”）。这些新增功能不仅提高了 CZTI 的光谱灵敏度，而且亚 MeV 光谱还可以正确表征费米未检测到的 GRB. 本文描述了在 100-900 keV 的单一、康普顿事件和否决光谱结合的方法，用于在运行的第一年检测到的 GRB。CZTI 在过去五年中已经探测到\(\sim \) 20 个明亮的 GRB。将新方法应用于大量 GRB 样本的光谱分析时，有可能显着改善结果并有助于更好地了解瞬发发射机制。