GCN Circular 18537
Subject
GRB 151027A: Continued P60 Monitoring
Event
Date
2015-10-30T14:37:08Z (10 years ago)
From
S. Bradley Cenko at NASA/GSFC <brad.cenko@nasa.gov>
S. B. Cenko (NASA-GSFC) and D. A. Perley (DARK/NBI) report on behalf of a larger collaboration:
We have continued to image the optical afterglow of GRB151027A (Maselli et al., GCN 18478) with the robotic Palomar 60-inch telescope (see Perley et al., GCN 18481). We report the following r�-band photometry, calibrated with respect to nearby point sources from the APASS survey:
t_mid time since burst (d) Magnitude
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2015-10-29T02:14:14 1.93 19.63 +/- 0.04
2015-10-30T02:02:28 2.92 20.48 +/- 0.08
This implies a relatively steep power-law decay index of ~ 1.9 at these times.
Continued observations are planned.