GRB 200819A: MITSuME Akeno optical upper limits
Abstract
We observed the field of GRB 200819A (Dichiara et al., GCN 28263; Evans et al., GCN 28265) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation with a series of 60 sec exposures started on 2020-08-19 15:45:44 UT. Some images were heavily affected by bad weather conditions. We stacked the images with good weather conditions. We did not find any new point sources within the enhanced Swift/XRT error circle (Evans et al., GCN 28265) of the stacked images. We obtained the 5-sigma limits as follows. T0+[sec] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ ~290 2020-08-19T17:36:48 5640 g'>18.4, Rc>19.0, Ic>19.3 ------------------------------------------------------------------------------------------------ T0+: Elapsed time after the burst T-EXP: Total Exposure time We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., submitted; https://github.com/MNiwano/Eclaire)
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2020
- Bibcode:
- 2020GCN.28269....1M