GCN Circular 38201
Subject
GRB 241113A: LCO optical observations
Date
2024-11-13T14:49:32Z (20 days ago)
From
luca.izzo@inaf.it
Via
Web form
L. Izzo (INAF-OACn and DARK/NBI), A. Martin-Carrillo (UCD), and D. B. Malesani (DAWN/NBI and Radboud Univ.) report:
We observed the field of GRB 241113A (Siegel et al., GCN #38194) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at Siding Spring, Australia. Observations started on 2024 November 13 at 09:55 UT (2.17 hr after the GRB trigger). We obtained a series of 3x180 s images in the SDSS-r filter, and of 5x120 s in the PS1-z filter.
Poor telescope tracking affects individual frames, significantly disrupting the point spread function (PSF) in the stacked images. Nevertheless, in the stacked z-band image, we detect a faint source consistent with the position of the optical source reported by Swift-UVOT (Siegel et al., GCN #38194) and by other optical facilities (Francile et al., GCN #38195, Huertas Ferrer et al., GCN #38197). We measure a preliminary magnitude of z = 19.9 +/- 0.3 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog. We did not detect any source at the same position in the r-band stacked image, up to a limit of ~ 20.1 mag.
This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719.