Update on HAWC observations of AT2021afpi / MASTER OT J030227.28+191754.5 (discovered during follow-up observations of IceCube-211125A)
ATel #15088; Hugo Ayala (PSU), on behalf of the HAWC Collaboration
on 6 Dec 2021; 22:41 UT
Credential Certification: Hugo Alberto Ayala Solares (hgayala@psu.edu)
Subjects: Gamma Ray, TeV, Nova
We update on the results of the HAWC observations (ATel #15079) around the position of the transient MASTER OT J030227.28+1917554.5 (ATel #15067). This object was reported as a possible counterpart to the event IceCube-211125A. Our analysis results on the IceCube event can be found in GCN #31153 .
After looking at data from 5 days, we did not observe a significant event. The time of the data spans the days 2021/11/26 to 2021/11/30. Each day the source position transits HAWC for about 6.35 hours. Since the gamma-ray emission from a dwarf nova is expected to be low, we use a power-law spectrum with an index of -3.0.
The 95% U.L. of the flux normalization is 3.5e-12 TeV-1 cm-2 s-1 at 1 TeV.
The HAWC contact people for this analysis are Jose Andres Garcia-Gonzalez (IF-UNAM, [jagarcia@fisica.unam.mx](mailto:jagarcia@fisica.unam.mx), ITESM-EIC, [anteus79@tec.mx](mailto:anteus79@tec.mx)) and Hugo Ayala (PSU, [hgayala@psu.edu](mailto:hgayala@psu.edu)). HAWC is a TeV gamma-ray water Cherenkov array located in the state of Puebla, Mexico, that monitors two-thirds of the sky every day with an instantaneous field of view of ~2 sr. HAWC website: [https://www.hawc-observatory.org/](https://www.hawc-observatory.org/)
