TITLE: GCN CIRCULAR NUMBER: 9694 SUBJECT: GRB 090720 Source found in ground processing of Swift-BAT data DATE: 09/07/20 17:35:54 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (NASA/GSFC/CRESST), S. Holland (NASA/GSFC/CRESST), M. Stamatikos (NASA/ORAU) on behalf of the Swift Team At 06:38:08 on July 20, 2009 Swift-BAT rate-triggered on GRB 090720 (BAT trigger #357811). The burst was also detected by the Fermi GBM (trigger #269764690, Rau, GCN #9688). No source was found onboard in automated processing. A significant source on the edge of the BAT field of view was found in ground processing. The position was RA, Dec 203.694, -10.335, which is equivalent to: RA (J2000) 13h 34m 46.6s Dec (J2000) -10d 20m 06s with an error radius of 3 arcmin (estimated 90% containment). This was 6 degrees from the Fermi GBM ground position, just outside the GBM 1-sigma radius. As seen in BAT, the burst was a single weak pulse about 3 seconds long. A Swift TOO has been requested and approved. The Swift Burst Advocate for this burst is Erik Hoversten (hoversten at astro dot psu dot edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)