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GCN Circular 6645

Subject
GRB 070721A : Faulkes Telescope South optical limit
Date
2007-07-21T15:25:42Z (17 years ago)
From
Andrea Melandri at Liverpool John Moores U <axm@astro.livjm.ac.uk>
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)
report


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.
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