TITLE: GCN CIRCULAR NUMBER: 38167 SUBJECT: GRB 241105A: VLT/FORS2 refined spectroscopic redshift z = 2.681 DATE: 24/11/11 14:28:48 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group antonio.martin-carrillo@ucd.ie

L. Izzo (INAF-OACn & DARK/NBI), A. A. Chrimes (ESA/ESTEC & Radboud Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Saccardi (CEA/Irfu), A. Martin-Carrillo (UCD), A. J. Levan (Radboud Univ. and Warwick Univ.), B. P. Gompertz (Birmingham), N. R. Tanvir (U. Leicester), J. T. Palmerio (CEA/Irfu), report on behalf of the Stargate collaboration:

Using the most updated calibration files, we have produced an improved reduction of the VLT/FORS2 afterglow spectrum (Izzo et al., GCN 38097) of GRB 241105A (Fermi GBM Team, GCN 38085; Yulakanti et al., GCN 38088). Compared to our preliminary version based on archival calibrations, we have found a slight discrepancy in the wavelength solution.

Based on the same features already discussed in our previous GCN 38097, the refined redshift we measure for GRB 241105A is z = 2.681. This change implies a modest reduction of ~1% and ~2% in the Eiso and Liso values reported by Frederiks et al. (GCN 38103) and Pathak et al. (GCN 38104).

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