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GCN Circular 34570

Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
2023-08-27T10:40:23Z (9 months ago)
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E. Pavoni and L. Moretti (Leavitt Observatory, Italy), in a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan), 
Y. Niino (Tokyo University, Institute of Astronomy), 
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Università degli Studi Di Salerno)

We observed the field of Swift J1727.8-1613 (GRB 230824A: Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543; U.Quadri et al., GCN 34562; C. Lopresti, GCN 34566) with the telescope of Leavitt Observatory, Italy. Member of: 

UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.
ATA - Associazione Tuscolana di Astronomia.

The observations began at 20:02 UT on 2023/08/24 (~6 hours after the Swift trigger), with our RC telescope D=250 mm F/D=8.

Weather conditions were good.

We took 25 images of 120 sec each. All images are Rc filtered, calibrated with master dark and master flat, stacked with ASTAP software and analyzed with AstroImageJ software.

We clearly detected a bright object, in the same location as M.Odeh et al., GCN 34543, within the uncertainty radius of the Swift localization, at:

R.A. (J2000): 17:27:43.32
Dec. (J2000): -16:12:18.8

The results of our photometry in Rc band are:

JD_UTC			        Source_Mag	Source_Mag_Err
2460181.3385997		13,766		         0,006			
2460181.3457458		13,725		         0,006			
2460181.3528939		13,731		         0,006
2460181.3603810		13,694		         0,006
2460181.3689481		13,671		         0,005

Magnitudes were estimated with PanSTARRS cat. and are not corrected for galactic dust extinction.

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