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Near-IR observations of the Supergiant Fast X-ray Transient (SFXT) IGR J17544-2619

ATEL # 2475; Sachindra Naik, Vishal Joshi, S. V. Vadawale, N. M. Ashok (Physical Research Laboratory, Ahmedabad, India)
on 12 Mar 2010; 4:09 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Sachindra Naik (

Subjects: Infra-Red, Binaries, Transients, Variables

The Supergiant Fast X-ray Transient (SFXT) IGR J17544-2619 which went to outburst on 2010 March 04 (ATel #2463) was observed in the near-infrared J-band on March 6 and in J, H, and K-band on March 7 with the 1.2m telescope (+ NICS with HAWAII-1 infrared array) at Gurushikhar, Mt Abu, operated by Physical Research Laboratory, Ahmedabad, India. The photometric observations were carried out in very clear and photometric sky conditions. Several frames in each of the three J, H, and K-bands were obtained in three dithered positions, offset by typically 30 arcsec from each other. The sky frames were generated by median combining the dithered frames and subtracted from the source frames followed by aperture photometry. On March 6, the J-band magnitude of the source was found to be 8.76 (+/- 0.03), whereas the J, H, and K-band magnitudes of the object, on March 7, were found to be 8.76 (+/- 0.05), 8.27 (+/- 0.04) and 8.20 (+/- 0.04), respectively. Spectroscopic observations were difficult because of the limited visibility of the object from the observatory. Further monitoring of the source will be carried out from Mt. Abu observatory.

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