GCN Circular 16193
Subject
GRB 140430A: NOT optical observations
Date
2014-04-30T23:43:05Z (10 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
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.