SIMBAD references

2011ATel.3453....1M - The Astronomer's Telegram, 3453, 1 (2011/June-0)

Swift detected outburst of the SFXT IGR J18410-0535/AX 1841.0-0536 .

MANGANO V., BARTHELMY S.D., ROMANO P., SAKAMOTO T., CHESTER M.M., SIEGEL M., EVANS P.A., ESPOSITO P., VERCELLONE S., BURROWS D.N., CUSUMANO G., FARINELLI R., KENNEA J.A., KRIMM H., LA PAROLA V. and GEHRELS N.

Abstract (from CDS):

The Swift Burst Alert Telescope (BAT) triggered on an outburst from the Supergiant Fast X-ray Transient (SFXT) IGR J18410-0535/AX1841.0-0536

on 2011 June 24 at 14:27:04.9 UT (image trigger=455967). Swift did not slew immediately because the merit value of this new trigger

was less than the merit value of the current target.

The source was detected in a 320-second BAT image trigger (T+0 s) starting

after settling (T-225 s) from a pre-planned slew. Ground processing reveals a weak detection in BAT (∼6.8 sigma, 15-50 keV). The mask-weighted

lightcurve shows some emission (∼0.02 counts/cm2/s, 15-50 keV) in the T-200 to T+0 pre-trigger interval. The emission increases slightly

to ∼0.05 counts/cm2/s around T+130 to T+200 s. A simple power law fit to the spectrum (T+0 to T+320 sec) yields an index of 2.6 ± 0.7 (chisq is 63.7, dof=57), and the fluence is (4.8,-1.9,+2.3)E-7 erg/cm2.

The XRT began a single orbit follow up observation of the field at 15:52:47 UT, about 5100 s after the BAT trigger. The limited duration of the XRT follow (∼1 ks) was due to strict temperature constraints. The source count rate reached a peak at about 7 counts/s and decreased

to about 2 counts/s at the end of the observation. The spectrum of PC mode data can be fitted (using Cash statistics) with an absorbed power-law with a photon index of 0.19 (+0.69,-0.30) and an absorbing column density of NH=[1.5(+2.2,-1.1) ]E22 cm-2. The average 2-10 keV unabsorbed flux is ∼3.6E-10 erg/cm2/s.

This is the second outburst of IGR J18410-0535 detected by the BAT for which Swift performed a follow up observation that clearly revealed an on-going flaring activity in the XRT. Observation results on the previous Swift-detected outburst, which occurred 2010 June 5, are reported in Romano et al. 2011 (MNRAS,412,L30). Compared to the 2010 June 5 event, this flare shares consistent spectroscopic

characteristics.

Several on-board BAT detections have been reported (Romano, et al. 2009,MNRAS,399,2021).

The historical light curve from the BAT hard X-ray transient monitor (Krimm et al, 2006, ATel #904; 15-50 keV) can be found at http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/IGRJ18410-0535/

We would like to thank the Swift Team for making these observations possible,

in particular the duty scientists as well as the science planners.


Abstract Copyright:

Journal keyword(s): Gamma Ray - Request for Observations - Binary - Neutron Star - Transient

Simbad objects: 1

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2021.03.07-20:09:21

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