TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3137
SUBJECT: Swift-BAT trigger 112060 is not a real GRB
DATE:    05/03/23 00:38:10 GMT
FROM:    Jay R. Cummings at NASA/GSFC/Swift  <jayc@milkyway.gsfc.nasa.gov>

J. Cummings (GSFC/NRC), S. Barthelmy, D. Burrows (PSU),
N. Gehrels (GSFC), J. Kennea (PSU), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
P. Roming (PSU), P. Schady (MSSL), T. Sakamoto (GSFC/NRC)
on behalf of the Swift team:

The Swift-BAT trigger (#112060) at 22:46:40 UT is not due to a GRB.
The trigger occurred while Vela X-1 was in the BAT FOV and in a
variable state.  Ground analysis has confirmed the very low
image-domain significance of the detection.  A visual inspection
of the mask-tagged light curve shows no significant emission
from the reported location.  Analysis of the XRT data shows
no source in the FOV.