GRB 191016A: COATLI Optical Observations and Detection of the Afterglow
Abstract
We observed the field of GRB 191016A (Gropp et al., GCN Circ. Gropp) with the COATLI 50-cm telescope and interim imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (http://coatli.astroscu.unam.mx) from 2019-10-16 04:40:19 (378.7 seconds after the trigger and 21.8 seconds after the alert) to 04:49, obtaining a total of 1200 seconds of exposure in the w filter. We detect a bright uncataloged source at 02:01:04.75 +24:30:36.8 J2000 (+/- 0.5 arcsec), about 91 arcsec from the BAT position. The source rises from w = 16.5 to w = 15.0 before fading. We suggest this is the afterglow. Our w magnitudes are calibrated against the Pan-STARRS1 catalog, are on an approximate AB system (Becerra et al., 2019, ApJ, 872, 118), and are not corrected for Galactic extinction in the direction of the GRB. Observations are continuing. We thank the COATLI technical team and the staff of the Observatorio Astronómico Nacional.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- October 2019
- Bibcode:
- 2019GCN.26010....1W