Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
ATel #3489; C. Pagani, A. P. Beardmore (U. Leicester), J. A. Kennea (PSU), J. R. Cummings (GSFC/UMBC) and D. Palmer (LANL) report on behalf of the Swift-XRT team.
on 16 Jul 2011; 02:02 UT
Credential Certification: Jay R Cummings (jayc@milkyway.gsfc.nasa.gov)
Subjects: X-ray, Gamma Ray, Request for Observations, Soft Gamma-ray Repeater, Pulsar
We have analysed 584 s of Photon Counting (PC) XRT data for Swift
J1822.3-1606 (Cummings et al. ATel. 3488), a probable SGR. The
XRT observations started 1.2 days after the BAT trigger.
A bright, uncatalogued X-ray source is detected inside the BAT error
circle at RA, Dec 275.5763, -16.0742 which is equivalent to:
RA(J2000) = 18h 22m 18.32s
Dec(J2000) = -16d 04' 27.2"
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This
location is 113 arcseconds from the BAT position.
Preliminary analysis of the Photon Counting mode data that has 2.5 sec
resolution yields an approximate period of 8.4 seconds. Further Swift
observations are planned in Window Timing mode to extract a more
precise period.
