Photometry of the optical afterglow of GRB 190530A
ATel #12830; J. Vinko, R. Szakats, A. Pal, L. Kriskovics, A. Ordasi, K. Sarneczky (Konkoly Observatory)
on 1 Jun 2019; 18:30 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)
Subjects: Optical, Gamma-Ray Burst
The optical afterglow (ATel #12824; GCN #24680; GCN #24684; GCN #24686; GCN #24687; GCN #24688; GCN #24690; GCN #24693; GCN #24697; GCN #24698; GCN #24700; GCN #24703; GCN #24708) of the bright GRB 190530A (GCN #24676, GCN #24677; GCN #24679; GCN #24678, GCN #24683) is marginally detected on the stacked Sloan-r band CCD frames (total exposure time 45 min) taken with the 0.8m RC80 telescope at Konkoly Observatory, Piszkesteto (Hungary) on 2019-05-31.35 UT, 1.42 day after the burst.
Aperture photometry on the stacked frame, tied to PS1 r-band data of 19 local comparison stars resulted in the following AB magnitude for the transient:
r_PS1 (AB) = 19.86 +/- 0.37 mag
This is consistent with R-band brightness (~19.39 +/- 0.05 AB-mag at 1.353 days after burst) reported by Moskvitin and Uklein (GCN #24708), but significantly brighter than the one measured by Kann
et al. (GCN #24700, Rc ~ 20.60 +/- 0.15 AB-mag at 1.44509 day after burst).
Further monitoring of this interesting transient is encouraged.
