GCN Circular 8848
Subject
1E1547.0-5408: Swift detection of dust halo
Date
2009-01-24T00:52:59Z (15 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
A.Tiengo, S.Mereghetti, G.Vianello, P.Esposito (INAF-IASF Milano),
G.L.Israel (INAF-OAR), N.Rea (Amsterdam Univ.), D.Gotz (CeA Saclay), on
behalf of a larger collaboration report:
A Swift/XRT observation performed on January 23 from 15:23 to 15:51 UT in
Photon Counting mode shows the presence of a dust scattering halo around
the position of the Anomalous X-ray Pulsar 1E1547.0-5408.
A bright ring with a radius of about 1 arcmin is clearly visible, but the
observation is too short to detect expansion.
Assuming that this ring is due to the bright burst detected on Jan 22 at
06:48:04 UT (Mereghetti et al. GCN 8841), and that the distance of
1E1547.0-5408 is 10 kpc, the distance inferred for the dust layer
responsible for the scattering is about 7 kpc.
Further observations to measure the time evolution of the dust scattering
rings can provide tighter constraints.