D. Palmer (), C. Pagani (U. Leicester) and M.H. Siegel (PSU) for the Swift team
Palmer (GCN Circ. 16808) reported the initial Swift results. In two successive 64-second images, beginning at 06:56:51, BAT detected a source at a consistent location. Table 1 contains the best reported positions from Swift.
Table 2 is a summary of GCN Circulars about this GRB from observatories other than Swift.
BAT results are not available.
We have analysed 12 ks of XRT data for the Swift/BAT-detected burst: GRB 140909A, from 44.0 ks to 251.9 ks after the Swift/BAT trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the Swift/BAT error circle. The source is fading with α >0.8.
The Swift/UVOT began settled observations of the field of GRB 140909A 44028 s after the BAT trigger
(Siegel and Sonbas GCN Circ. 16812).
No optical afterglow consistent with the XRT position (Pagani et al. GCN Circ. 16811) is detected in the initial UVOT exposure.
Table 3 gives preliminary
magnitudes using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc., 1358, 373).
No correction has been made for the expected extinction in the Milky Way
corresponding to a reddening of
Figure 1. The BAT light curve is not available.
Figure 2. The XRT light curve.
Any data from a crosshatched region are not included in the fit.
RA (J2000) | Dec (J2000) | Error | Note | Reference |
---|---|---|---|---|
1 |
+63°31'00.4" | 7.2" | XRT-final | UKSSDC |
1 |
+63°31'00.4" | 7.2" | XRT | Pagani et al. GCN Circ. 16811 |
1 |
+63°29'38" | BAT-initial | Palmer GCN Circ. 16808 |
Band | Authors | GCN Circ. | Subject | Observatory | Notes |
---|
Filter | Exp(s) | Mag | ||
---|---|---|---|---|
white | 44028 | 56310 | 3213 | >22.0 |
Table 3. UVOT observation reported by Siegel and Sonbas (GCN Circ. 16812). The start and stop time of the exposure are given in seconds since the BAT trigger. The preliminary 3-σ upper limit is given. No correction has been made for extinction in the Milky Way.
May 22, 2015