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GCN Circular 22976

GRB 180720B: LCO Haleakala possible bright optical candidate
2018-07-20T15:30:47Z (6 years ago)
Renato Martone at Universita' di Ferrara <>
R. Martone, C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), A. Cucchiara, D. Morris (U. of Virgin Islands) on behalf of a large collaboration report:

The LCO 2-m unit at Haleakala Observatory (Hawaii) began observing Swift GRB180720B (Siegel et al. GCN 22973)  on July 20, 14:33:34 UT (11.8 minutes after the GRB trigger time) with the SDSS i' filter. On the border of the Swift-XRT error circle, we detect a 13-mag uncatalogued object at the following position:

RA(J2000)= +00:02:06.87
DEC(J2000)= -02:55:05.2

with an error radius of ~1���  as calibrated against nearby SDSS stars.
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