{
  "createdOn": 1770105051529,
  "submittedHow": "web",
  "subject": "GRB 251230A: MeerLICHT afterglow detection",
  "circularId": 43608,
  "submitter": "Simon de Wet at DTU Space <simdewet@gmail.com>",
  "format": "text/plain",
  "bibcode": "2026GCN.43608....1D",
  "body": "S. de Wet (DTU Space) and P.J. Groot (Radboud/UCT/SAAO) report on behalf of the MeerLICHT consortium:\n\nThe 0.6m wide-field MeerLICHT optical telescope located in Sutherland, South Africa, obtained a repeating series of 60s exposures in the q,u,g,r,i,z filters following the detection of GRB 251230A by Swift (Lanava et al., GCN 43252). Our observations began 185 seconds after the Swift trigger and continued for approximately 26 minutes following the filter sequence quqgqrqiqz. A further four exposures were taken after a gap of approximately 30 minutes. \n\nWe detect the bright optical afterglow in all of our images, and report the following first detections in each filter:\n\nq = 12.99 +/- 0.01 at 01:25:21 UT\nu = 13.95 +/- 0.05 at 01:26:41 UT\ng = 14.24 +/- 0.02 at 01:29:24 UT\nr = 14.43 +/- 0.01 at 01:32:07 UT\ni = 14.67 +/- 0.01 at 01:34:51 UT\nz = 14.80 +/- 0.03 at 01:37:36 UT\n\nWe measure a power-law decline rate of -1.54 in the q-band. A light curve is available at the following link: https://raw.githubusercontent.com/simdewet/GRB_lightcurves/main/GRB251230A.pdf\n \nMeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam. ",
  "eventId": "GRB 251230A"
}