GRB 221009A: Swift detected transient may be GRB

We provide an update on the BAT trigger 1126853, AKA Swift J1913.1+1946 (GCN #32632). Examination of XRT data from this trigger shows strong fading. We also note that Fermi/LAT has triggered on the same location. There is also a possible association with a Fermi/GBM trigger @ 13:16:59UT. Given this, we believe that this source is now likely a Gamma-Ray Burst and not a Galactic Transient. If the GBM trigger is the same source, this would suggest a highly energetic outburst, and therefore we strongly encourage follow-up of this usual event.