{
  "createdOn": 1729336354268,
  "format": "text/plain",
  "subject": "GRB 241018A: REM optical/NIR upper limits",
  "body": "\nM. Ferro, P. D’Avanzo, M. G. Bernardini, D. Fugazza, R. Brivio, Y.-D. Hu, and S. Covino  (INAF-OAB), report on behalf of the REM team:\n\nWe observed the field of GRB 241018A detected by SVOM (Atteia et al., GCN 37812; Maggi et al., GCN 37814; Qiu et al., GCN 37819), with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, H bands, starting on 2024 October 19 at 07:08:55 UT (i.e. 19.2 hours after the Fermi trigger), and lasting for about 40 minutes.\n\nFrom preliminary photometry at the best candidate afterglow position (Qiu et al., GCN 37819; Malesani et al., GCN 37821) we did not detect any optical/NIR counterpart down to the following 3sigma magnitude upper limits:\n\nH > 17.5 (Vega; calibrated against the 2MASS catalogue)\nr > 18.9  (AB; calibrated against the PS1 catalogue)\nat a mid-time of t - t0 = 19.5 hours after the trigger.",
  "circularId": 37822,
  "bibcode": "2024GCN.37822....1F",
  "submittedHow": "web",
  "submitter": "Matteo Ferro at INAF-OAB <matteo.ferro@inaf.it>",
  "eventId": "GRB 241018A"
}