GRB 200906A: OSN 1.5m Upper Limit
Abstract
We observed the location (Beardmore et al., GCN #28373) of the Swift GRB 200906A (Page et al., GCN #28371; GBM detection: Fermi GBM Team, GCN #28370, Hamburg et al., GCN #28374) with the 1.5m telescope of the Observatorio Sierra Nevada, in Granada, Spain. We obtained 78 x 100 s images beginning 2020-09-06 21:29:03.51 UT, after clouds had cleared. In a stack of all images, centered at 0.39467 days after the GRB, no source is detected at the enhanced XRT position. Measured against two nearby USNO-B1.0 stars, we derive an upper limit of Ic > 23.4 mag. This agrees with the non-detection reported by Fu et al. (GCN #28372). We note the refined XRT analysis (Beardmore et al., GCN #28375) also reports an NH column density significantly exceeding the Galactic value, indicating this is a dark GRB.
- Publication:
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GRB Coordinates Network
- Pub Date:
- September 2020
- Bibcode:
- 2020GCN.28376....1K