Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 23699

Subject
GRB 190114C: OASDG optical observations
Date
2019-01-15T01:01:57Z (5 years ago)
From
Luca Izzo at IAA-CSIC <luca.izzo@gmail.com>
L. Izzo (HETH/IAA-CSIC), A. Noschese, L. D���Avino and M. Mollica (AC-OASDG) report:

We observed the field of GRB 190114C (Gropp et al. GCN 23688) with the 0.5m telescope of the Osservatorio Astronomico S. Di Giacomo located in Agerola, Italy ( https://goo.gl/Dqvqhf ). Observations were carried out under bad weather conditions and with the GRB position initially at 15 degrees above the horizon.

We obtained a series of 180 s images in the Rc filter, starting at 21:29:23 UT, ~ 0.54 hrs after the GRB detection. The GRB is clearly detected in the first image at the position of the observed optical counterpart (Tyurina et al. GCN 23690, Lipunov et al. GCN 23693, Selsing et al GCN 23695), but it is rapidly fading in the following images. We have stacked our set of images in groups of two images each, measuring the following magnitudes (AB):

Time   Rc          dRc
(hrs)   (mag)     (mag)

0.54   16.86      0.07
0.65   17.06      0.07
0.74   17.21      0.08
0.86   17.27      0.08
0.97   17.47      0.09
1.07   17.69      0.10

The calibration was performed using nearby stars in the Pan-STARRS PS1 catalog and using transformation equations to Rc magnitudes.
Looking for U.S. government information and services? Visit USA.gov