TITLE: GCN CIRCULAR NUMBER: 6027 SUBJECT: GRB 070126?: Swift detection of a possible burst DATE: 07/01/26 03:04:26 GMT FROM: Loredana Vetere at PSU L. Vetere (PSU), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), S. T. Holland (CRESST/GSFC/USRA), S. Immler (GSFC/USRA), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), J. L. Racusin (PSU), J. L. Racusin (PSU), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and E. Troja (INAF-IASFPA) report on behalf of the Swift Team: At 02:33:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located a possible source (trigger=257741). Swift slewed immediately to the location. The BAT on-board calculated location is RA, Dec 33.460, -73.523 which is RA(J2000) = 02h 13m 50s Dec(J2000) = -73d 31' 23" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows no significant variation, which is not uncommon for image triggers. We will have to wait for ground analysis to determine if this is a real source. The XRT began observing the field at 02:35:21 UT, 116 seconds after the BAT trigger. XRT centroided on a cosmic ray and no source is visible in the field of view up to an exposure time of 203s. The UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 123 seconds after the BAT trigger. The quickly available image does not cover any portion of the BAT error circle.