TITLE: GCN CIRCULAR NUMBER: 37579 SUBJECT: EP240919a / GRB 240919A: REM optical and NIR upper limits DATE: 24/09/20 18:12:34 GMT FROM: Riccardo Brivio at INAF-OAB riccardo.brivio@inaf.it
R. Brivio, M. Ferro, P. D'Avanzo, Y.-D. Hu, S. Covino, D. Fugazza (INAF-OAB), D.B. Malesani (DAWN/NBI and Radboud Univ.) report on behalf of the REM team:
We observed the field of EP240919a (Liang et al., GCN 37561), also identified as GRB 240919A (Liang et al., GCN 37564; Rodi et al., GCN 37573; Wang et al., GCN 37574) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, and K bands, started on 2024 September 19 at 23:27:28 UT (i.e. 8.6 hr after the burst), and lasted for about 1 hour.
From preliminary inspection of the images, we do not find any optical/NIR counterpart within the EP error circle down to the following 3sigma limit:
r > 20.8 (AB; calibrated against the Pan-STARRS catalogue); H > 17.3 (Vega; calibrated against the 2MASS catalogue);
at a mid-time of 9.1 hours after the trigger.
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