GCN Circular 36099

Rosa L. Becerra (Tor Vergata, Roma), Alan M. Watson (UNAM), Eleonora Troja (Tor Vergata, Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), William H. Lee (UNAM), Alexander Kutyrev (GSFC/UMD), Tsvetelina Dimitrova (ASU), Keneth Garcia Cifuentes (UNAM), Camila Angulo Valdez (UNAM), Margarita Pereyra (UNAM) and Océlotl Lopez (UNAM) report:

We observed LIGO/Virgo/KAGRA S240413p (GCN #36075) with the DDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2024-04-13 UTC.

We tiled the LVKC localization with one pointing centred on 165.541667 +11.866667  (J2000). The combined field covers about 48 square degrees and includes about 41% of the probability in the current BAYESTAR map. 

We observed from 2024-04-13 05:58 UTC to 2024-04-13 09:29 UTC (from T+3.6 to
T+7.1 hours after the event) obtaining exposures of 2.4 hours across
the field in the w filter, with 10-sigma limiting magnitudes of w = 20.2 to
w = 20.9. 

Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogs we
detect no uncatalogued sources within the observed field to our 10-sigma
limit. We observe the galaxy WISEA J105644.96+105455.6 (GCN #36080) without any evidence of flare activity.

Further observations are planned.

We thank the staff of the Observatorio Astronomico Nacional in San Pedro
Martir.