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GCN Circular 35787

Transient EPW20240219aa: Mondy optical observations
2024-02-24T13:32:36Z (5 months ago)
Alexei Pozanenko at IKI, Moscow <>
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N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI, HSE) report on behalf of IKI-GRB-FuN:

We observed the field of a likely GRB event EPW20240219aa (Zhang et al., GCN 35773) which was also detected by Fermi GBM (Fletcher et al., GCN 35776; Mangan & Meegan, GCN 35778), Swift BAT (DeLaunay et al., GCN 35784), and and Insight-HXMT/HE  (Cai et al., GCN 35785) with AZT-33IK telescope of Sayan observatory (Mondy). The observations started on 2024-02-23 (UT) 12:31:49, i.e. t-T0 = 4.276478 days after trigger. We took 30x120 sec frames in R-filter. After human vetting we list the two potential galaxies candidates, which show brightness excess more than 3sigma in comparison with USNO-B1.0 catalog.

     RA             Dec     Mag    Err     USNO_B10    R2    Class*   Sigma excess      
     --             ---     ---    ---     --------    --    -----   -----
05 19 56.874  +25 29 43.69  18.00  0.13  1154-0071628 19.15    G     4.07
05 20 17.951  +25 33 08.34  18.63  0.12  1155-0072251 19.47    G     3.03

G -- Galaxy

According to our classifier based on PS1 colours, source FWHM, and SIMBAD query.

The photometry performed against nearby USNO-B1.0 stars (R2 magnitude).
The limiting magnitude (3sigma) is R=21.5.

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