Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 16816

GRB 140909A: Confirmation of the Swift-XRT afterglow
2014-09-12T10:36:45Z (10 years ago)
Claudio Pagani at U of Leicester <>
C. Pagani (U. Leicester) and E. Sonbas (Adiyaman U.) report on behalf of 
the Swift team:

A second epoch of XRT data was collected on the field of the Swift/BAT 
ground detected GRB 140909A (Palmer, GCN Circ. 16808), from 148 ks to 
252 ks after the  Swift/BAT trigger.

The X-ray source reported in GCN Circ. 16811, Pagani et al., at a mean 
count rate of 6.9e-03 ct/sec, is now no longer detected, having faded 
below a 3-sigma upper limit of 2.3 x 10^-3 count s^-1 (0.3-10 keV). We 
therefore confirm that this is the X-ray afterglow of GRB 140909A

This circular is an official product of the Swift-XRT team.
Looking for U.S. government information and services? Visit