{
  "body": "G. Schroeder (Cornell), D. A. Perley (LJMU), and T. Laskar (Utah) report on behalf of a larger collaboration:\n\nThe Karl G. Jansky Very Large Array observed the location of the afterglow (Hinds et al., TNS AstroNote 2026-65; Konno et al., GCN 43974) associated with GRB 260310A (Fermi GBM Team, GCN 43951; Hamburg & Meegan, GCN 43975) using all available receivers from L-band to Q-band, providing nearly continuous spectral coverage from 1 to 50 GHz, as a part of our multi-frequency public campaign (Perley et al., GCN 44160). Observations were carried out on UT 2026-04-04 between 08:42 and 12:19 UT, approximately 25.2 days after the GRB.\n\nPreliminary flux densities are:\n\n| freq(GHz) |  flux(mJy) \t|\n|-----------|----------------|\n| 1.5     | 1.74 +/- 0.06 |\n| 3     \t| 5.00 +/- 0.04 |\n| 6     \t| 8.39 +/- 0.05 |\n| 10    \t| 8.93 +/- 0.12 |\n| 15    \t| 8.16 +/- 0.22 |\n| 22   \t| 7.34 +/- 0.23 |\n| 33    \t| 6.14 +/- 0.19 |\n| 45    \t| 5.25 +/- 0.19 |\n\nCompared to previous radio observations (Rhodes et al., GCN 44005; Giarratana et al., GCN 44045; Ho et al., GCN 44057; Ho et al., GCN 44134, Perley et al., GCN 44160), the afterglow is brightening at lower frequencies (< 10 GHz) and fading at higher frequencies (> 10 GHz).\n\nWe thank the NRAO staff for scheduling and executing these observations. \n\nFurther observations are planned.",
  "format": "text/markdown",
  "createdOn": 1775615275961,
  "subject": "GRB 260310A: Continued VLA Multi-frequency Radio Observations",
  "submitter": "Genevieve Schroeder at Cornell University <genevieveschroeder@u.northwestern.edu>",
  "eventId": "GRB 260310A",
  "submittedHow": "web",
  "bibcode": "2026GCN.44235....1S",
  "circularId": 44235
}