GRB 190829A: NOT optical afterglow detection and spectroscopy
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We observed the Swift-detected GRB 190829A (Dichiara et al., GCN 25552)
with the Nordic Optical Telescope (NOT) equipped with AlFOSC. We
obtained 3x300s r-band images at a mid-time of 02:03:52 UT on August 30
(i.e. 6.1 hr post-burst). We clearly detect the optical counterpart
reported by Xu et al. (GCN 25555), superimposed on the SDSS galaxy
J025810.28-085719.2 at z=0.08 as noted previously. We measure a
preliminary magnitude of r(AB) = 18.9 +/- 0.1 for this source,
calibrated against photometry of nearby field stars from the Pan-STARRS
catalog. Following the imaging sequence, we obtained a series of
spectra with an integration time of 4x600s using grism 4 (covering
320-960 nm), beginning at 02:27:42 UT. The spectrum shows a featureless
red continuum, with no clear absorption lines to identify the redshift.
Since the continuum is detected at all observed wavelengths we can
place a limit on the redshift of z <1.8. DisclaimerNone
Originalsprog | Engelsk |
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Tidsskrift | GRB Coordinates Network, Circular Service |
Udgave nummer | 25563 |
Status | Udgivet - 1 aug. 2019 |
Links
- http://adsabs.harvard.edu/abs/2019GCN.25563....1H
Forlagets udgivne version
ID: 261068713