RXTE/ASM observations of new SGR 1627-41
ATel #30; D. A. Smith & A. M. Levine (MIT)
on 19 Jun 1998; 19:16 UT
Credential Certification: Donald A. Smith (dasmith@space.mit.edu)
Subjects: X-ray, Gamma Ray, Soft Gamma-ray Repeater, Supernova Remnant
Although the ASM did not observe any of the BATSE-detected events from
SGR 1627-41, during the interval from Jun 15 to Jun 19, three short
(<~1 s) burst events were detected in SSC 3 at May 17.943917,
17.954243, and 18.010803 (UTC).
During the first event, the original BATSE location (ATEL #29) was
outside the FOV of the ASM. The full width of the FOV of SSC 3 during
the first event restricts the range of declination values along the
IPN annulus (GCN #115) between -44.4 and -56.4 degrees. This is fully
consistent with the revised BATSE position reported in GCN #113.
Due to low signal-to-noise, our standard cross-correlation technique
was unable to isolate these events in our position data, but given the
IPN annulus, we were able to search along it for a best-fit location.
We find a minimum reduced chi-squared at R.A. = 16h35m50s, Decl.=
-47o32' for event 1 and R.A. = 16h35m50s, Decl.= -47o39' for event 2
(1-sigma error of 4' in Decl. in both cases). Both positions are
consistent with the location of the SNR (g337.0-0.1) mentioned in
GCN #113.
If we assume these bursts are coming from SNR G337.0-0.1, we can use
its location to measure the burst fluxes:
Event Fluence Peak Flux (2-12 keV)
(10^{-7} erg/cm^2) (10^{-7} erg/cm^2/s)
1.5-3 3-5 5-12 kev (1-s averages)
1 <0.6 <0.4 2.1 (+- 0.3) 1.1
2 <0.8 <0.4 2.9 (+- 0.5) 2.8
Upper limits are 2-sigma. We do not yet have pointing information for
the observation of the third burst.
