GRB 090709A: quasiperiodic variations in the BAT light curve. Markwardt, C. B. ; Gavriil, F. P. ; Palmer, D. M. ; Baumgartner, W. H. ; Barthelmy, S. D. Abstract Publication: GRB Coordinates Network Pub Date: 2009 Bibcode: 2009GCN..9645....1M