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 6645

GRB 070721A : Faulkes Telescope South optical limit
2007-07-21T15:25:42Z (17 years ago)
Andrea Melandri at Liverpool John Moores U <>
A. Melandri, (Liverpool JMU), C. Guidorzi (Uni-Bicocca/INAF-OAB),
I.A. Steele, C.G. Mundell, D. Carter, R.J. Smith, C.J. Mottram,
D.F. Bersier, S. Kobayashi, M.J. Burgdorf, M.F. Bode (Liverpool JMU),
A. Gomboc (Ljubljana), P. O'Brien, E. Rol, N. Bannister (Leicester)

On 2007 Jul 21 at 13:47:14 UT the Faulkes Telescope South
observed the field of GRB070721A (trigger=285653, Ziaeepour
et al., GCN 6639).

No new source is detected inside the refined XRT error circle
(Evans et al., GCN 6644) and we can set an upper limit of
R > 20.0 between 3.9 and 4.8 hours after the trigger.
Looking for U.S. government information and services? Visit