Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

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.
Looking for U.S. government information and services? Visit