MAXI J1747-249 is Swift J174805.3-244637 (AKA Terzan 5 X-3)
ATel #15919; J. A. Kennea (PSU), A. Bahramian (Curtin), C. Heinke (Alberta) and H. Negoro (Nihon U).
on 1 Mar 2023; 01:34 UT
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)
Subjects: X-ray, Neutron Star
MAXI reported an outburst of a transient coincident with Terzan 5, MAXI J1747-249 (ATEL #15917). Starting at 19:39UT on Feb 28th, 2023, Swift performed a target-of-opportunity observation in Photon Counting mode, tiling the MAXI error region with 4 pointings of 250s each. In two of the pointings, a bright point source was found at the following location: RA/Dec(J2000) = 267.0218, -24.7777,
RA(J2000) =17h 48m 05.24s,
Dec(J2000) = -24d 46m 39.8s),
with an error radius 3.5 arc-seconds (90% confidence). This position is consistent with the location of Swift J174805.3-244637 AKA Terzan 5 X-3 (Bahramian et al, 2014). Therefore, we are seeing a new outburst from this source.
The brightness of X-ray source is 31.8 +/- 0.9 count/s, corrected for pile-up. The spectrum is well described by an absorbed power-law with photon index 0.93 +/- 0.20, with N_H = 2.7 +/- 0.5 x 10^22 cm^-2. The observed flux is 3.8 +/- 0.3 x 10^-9 erg/s/cm^2.
This is only the second recorded outburst of this transient, and therefore observations are strongly encouraged.
