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

GCN Circular 16193

GRB 140430A: NOT optical observations
2014-04-30T23:43:05Z (10 years ago)
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <>
D. Malesani (DARK/NBI), T. Kruehler (ESO Santiago), A. de Ugarte Postigo 
(IAA/CSIC and DARK/NBI), H. Dahle (Univ. Oslo), E. Soto (CUA), report on 
behalf of a larger collaboration:

We observed the optical afterglow of GRB 140430A (Siegel et al., GCN 
16190; Melandri et al., GCN 16192) with the Nordic Optical Telescope 
equipped with ALFOSC. We took a single 100-s image in the R filter 
starting at 22:00 UT (86.5 min after the GRB). The optical afterglow is 
well detected at coordinates (J2000):

RA = 06:51:44.61
Dec = +23:01:25.1

with an uncertainty of 0.3". Assuming R = 15.13 for the USNO star at RA 
= 06:51:41.3, Dec = +23:01:44.0, we measure for the optical afterglow a 
magnitude R = 18.78 +- 0.02 (statistical error only).

A 1800-s spectrum was acquired starting at 22:11 UT, at airmass 2.2-2.8, 
covering the wavelength range 3200-9100 AA. From a preliminary analysis, 
no absorption or emission features are seen in the spectrum. From the 
lack of a DLA feature down to ~4000 AA, we can set a redshift limit z < 2.3.
Looking for U.S. government information and services? Visit