{
  "submittedHow": "web",
  "submitter": "Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>",
  "bibcode": "2023GCN.34624....1P",
  "eventId": "GRB 230903A",
  "body": "D. Pieterse (Radboud University), D. B. Malesani (Radboud and DAWN/NBI), E. Le Floc’h (CEA-Saclay), A. Saccardi (GEPI, Obs. de Paris) and N. R. Tanvir (Univ. of Leicester) report on behalf of the Stargate collaboration :\n\nWe observed the field of GRB230903A (Fermi GBM team, GCN 34608 ; D’Ai et al., GCN 34610) using the ESO VLT UT3 (Melipal) equipped with the X-shooter instrument. Three 60s exposures were obtained in the r-band on 2023 September 4.097 UT (T-To ~8.95h). The observations were performed under poor weather conditions, with a seeing of 3.2 arcsec measured in the data. We do not detect any source coinciding with the location of the X-ray afterglow detected by Swift/XRT (D’Ai et al., GCN 34610). We obtain the following upper limit, calibrated using a faint, nearby object from the Legacy Survey (Dey et al. 2019, ApJ, 257, 29).\n\nr > 22.7 mag (AB)\n\nThis estimate is not corrected for Galactic extinction and is consistent with the non-detection reported earlier by LCOGT (Strausbaugh et al., GCN 34611).\n\nWe acknowledge excellent support from the ESO observing staff in Paranal, in particular Claudia Paladini and Jonathan Smoker.",
  "circularId": 34624,
  "createdOn": 1693908426555,
  "subject": "GRB 230903A: VLT/X-shooter optical observations"
}