{
  "bibcode": "2020GCN.28331....1I",
  "body": "L. Izzo (DARK/NBI) reports:\n\nWe observed the field of GRB 200829A (Siegel et al., GCN #28307; Ursi et al., GCN #28314; Ridnaia et al., GCN #28323; Lesage & Meegan, GCN #28326) with the IO:O camera mounted on the 2-m Liverpool Telescope located in La Palma, Spain. Observations started on August 29 at 20:31:39 UT (0.272 days after the GRB trigger) and a second epoch was obtained on August 30 at 22:38:42 UT (1.362 days). In both epochs, we obtained a series of 5x60s images in the griz filters.\nThe optical afterglow (Siegel et al., GCN #28307, Pozanenko et al., GCN #28308; Kuin & Siegel, GCN #28311; Lipunov et al., GCN #28315; Vinko et al., GCN #28316; Hentunen et al., GCN #28318; Moskvitin et al., GCN #28322, GCN #28328, Zhu et al., GCN #28324, GCN #28330; Pankov et al., GCN #28329) is visible in the stacked images in both epochs. We measure the following preliminary AB magnitudes, calibrated against Pan-STARRS catalog stars:\n\nFilter      mag     err     MJD\n\nSDSS-g  18.91  0.05  (59090.855)\nSDSS-g  21.17  0.09  (59091.944)\nSDSS-r  18.76  0.04  (59090.860)\nSDSS-r  21.34  0.10  (59091.948)\nSDSS-i  18.65  0.04  (59090.865)\nSDSS-i  21.25  0.09  (59091.953)\nSDSS-z  18.57  0.04  (59090.870)\nSDSS-z  20.50  0.08  (59091.958)",
  "circularId": 28331,
  "createdOn": 1598874744000,
  "email": "luca.izzo@gmail.com",
  "subject": "GRB 200829A: Liverpool Telescope observations",
  "submitter": "Luca Izzo at DARK/NBI  <luca.izzo@gmail.com>",
  "eventId": "GRB 200829A"
}