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# This kind of negative follow-up messages are better suited for # individual target-oriented campaign lists, Berto. From: "B Monard" <bmonard@mweb.co.za> Date: Sun, 21 Sep 2003 13:45:04 +0200 Subject: [vsnet-alert 7889] IGR J17544-2619 / follow-up The star region near the INTEGRAL source IGR J17544-2619 was observed on consecutive nights from Sep 17 to Sep19 2003 at the Bronberg Observatory / CBA Pretoria. No new source has shown up around the reported position to a limiting magnitude of 19.5CR with respect to images from DSS2-red and -NIR. No significant change in brightness of any of the field stars was noticed on images of the respective nights 17 to 19 Sep 2003. Therefore it can be concluded that no dramatic brightening occurred in the optical wavelength range 400 to 1000nm, following the X ray outbursts from this source. The ROSAT source 1RXS J175428.3-262035 at position 175428.2-262034, did not show any significant brightness changes as per these observations: 1RXS J175428.3-262035 030917.775 15.95CR MLF 1RXS J175428.3-262035 030918.750 15.97CR MLF 1RXS J175428.3-262035 030919.750 16.03CR MLF The location (17 54 25.7 -26 19 58) of the X ray source, indicated in IAUC 8202 by R. Gonzalez-Riestra et al, XMM-Newton Science Operations Centre, Madrid, is extremely close to a 12th magnitude star (17 54 25.3 -26 19 52), which did not show any optical brightness changes over the three observing nights at Bronberg. The only candidate that can be proposed as a possible counterpart is Source 1, mentioned in my previous report. It is located at 17 54 24.88 -26 20 40.5 and showed the following brightnesses: Unknown source 030917.775 19.0CR MLF Unknown source 030918.750 [19.5CR MLF Unknown source 030919.750 [20.5CR MLF It's however equally possible that its detection on 17 Sep 2003 was due to an artefact. Berto Monard Bronberg Observatory / CBA Pretoria
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