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GCN Circular 36274

Subject
LIGO/Virgo/KAGRA S240422ed: Archival DECaPSs2 observations of the field of Mag24a
Date
2024-04-24T06:00:35Z (3 months ago)
From
Janet Chen at National Central University <janetstars@gmail.com>
Via
Web form
Steve Schulze (CIERA, Northwestern) and Nial R. Tanvir (University of Leicester) report on behalf of the ENGRAVE GW collaboration:

We detect an object at the position of Mag24a (Piro et al., GCN 36267) in archival stacked r- and z-band images of the Dark Energy Camera Plane Survey 2 (DECaPS2; Saydjari et al. 2022).

https://www.legacysurvey.org/viewer?ra=119.0234&dec=-22.8979&layer=decaps2&zoom=16&sources-dr7&sources-dr8&sources-dr9&sources-dr9n&sources-dr9s&sources-dr10&sources-dr10-south

The diffuse emission of the galaxy at RA, Decl. (J2000) = 7:56:05.744, -22:54:03.51 hinders accurate photometry. We measure r = 22.64 +- 0.08 and z = 21.79 +- 0.08 (not corrected for MW extinction) using a circular aperture with a diameter of 1.1 arcsec and stars from PanSTARRS.
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