GRB 190613A: SEDM Observations
Abstract
We observed the optical counterpart to GRB 190613A (Ambrosi et al., GCN 24798) with the Spectral Energy Distribution Machine (SEDM) on the 60 inch telescope at Palomar Observatory. The SEDM is a low resolution (R ~ 100) integral field unit spectrometer with a multi-band (ugri) rainbow camera imager (see Blagorodnova et al. 2018, PASP, 130, 035003, and Rigault et al. 2019, astro-ph/1902.08526). The SEDM began observing the optical counterpart at 04:18:22 UTC (8.75 minutes after the burst trigger time). We performed an 1800 s exposure over the wavelength range 3800-9200 A. The continuum emission is well-fit by a power law spectrum with index alpha = 0.56 (f_nu ~ nu^-alpha). We detect an absorption line at an observed wavelength of ~ 4597 A. We tentatively identify this line as due to Lyman alpha at z = 2.78 - however due to the lack of corroborating features we consider this redshift tentative currently.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- June 2019
- Bibcode:
- 2019GCN.24850....1C