[vsnet-grb-info 14984] GRB 140515A: Optical observations from the 2.5 m NOT

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16278
SUBJECT: GRB 140515A: Optical observations from the 2.5 m NOT
DATE:    14/05/16 00:30:12 GMT
FROM:    Antonio de Ugarte Postigo at IAA-CSIC  <deugarte at iaa.es>

A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J. Gorosabel

(IAA-CSIC, UPV-EHU), D. Xu (DARK/NBI), J.P.U. Fynbo

(DARK/NBI), P. Jakobsson (U. Iceland), D. Malesani

(DARK/NBI), N.R. Tanvir (U. Leicester), E. Gafton

(OKC, Stockholm Univ.) and T. Libbrecht (Stockholm Univ.)

report on behalf of a larger collaboration:


We have observed the afterglow of GRB 140515A (D'Avanzo et al.,

GCN 16267) with the 2.5m NOT telescope. Observations consisted

of 5x300s imaging in the z-band and have an average epoch of

12.10 hr after the burst. The images reveal the optical afterglow

detected by Chornock et al. (GCN 16269) and Fong et al. (GCN

16274) at a magnitude of z(AB) = 22.15+/-0.15, as compared with

SDSS stars. This indicates a decay with a slope of alpha ~ -0.9

(where F_nu~t^alpha) as compared with the photometry of Fong

et al. (GCN 16274). Further observations are ongoing.