GCN Circular 44057
Subject
NOEMA Detection of GRB 260310A / AT 2026fgk
Event
Date
2026-03-20T14:52:58Z (16 days ago)
Edited On
2026-03-20T15:29:02Z (16 days ago)
From
Anna Y Q Ho at Cornell University <ayh24@cornell.edu>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Anna Y Q Ho at Cornell University <ayh24@cornell.edu>
Via
Web form
Anna Y. Q. Ho (Cornell), Michael Bremer (IRAM), Genevieve Schroeder (Cornell) report on behalf of a larger collaboration:
On UT 2026 March 20 the NOrthern Extended Millimeter Array (NOEMA) observed the position of GRB 260310A / AT2026fgk (GCN 43951, 43958, 43974), a nearby (z=0.153; GCN 43977) gamma-ray burst with bright radio emission at cm wavelengths (GCN 44005, 44045). Observations were obtained in the new dual-band mode (100+230 GHz) as well as in Band 2 (150 GHz). With self-calibration, we measure a preliminary flux density of 17 mJy at 100 GHz, corresponding to a luminosity of 10^42 erg/s, typical for GRB afterglows at this epoch.
Further observations are planned. We thank the NOEMA staff for rapidly approving and scheduling these observations.