Swift observations of IceCube-240105A event
ATel #16397; Raj Prince (CFT)
on 9 Jan 2024; 16:47 UT
Credential Certification: Aditi Agarwal (aditiagarwal.phy@gmail.com)
Subjects: X-ray, Gamma Ray, >GeV, Neutrinos
Blazar PKS 0446+11 (4FGL J0449.1+1121; RA = 72.28 deg and Dec = +11.36 deg) was found to be in the 90% error region of the IceCube-240105A event and located at 0.4 deg away from the best-fit position as reported in the GCN circular (GCN#35485,#35498) on 05/01/2024. We performed the target of opportunity observation using the Swift-XRT in X-ray on January 06 and 08, 2024 for this source. The source is found to be in a high flux state compared to its archival X-ray observations in 2015 where the flux in 0.3-10 keV is estimated as 2.5X10^-13 erg/cm^2/s.
Preliminary analysis was performed using the online tool (Evans et al. 2009) and the observed flux in 0.3-10.0 keV was estimated by using the power-law spectral model. On January 06 and 08, 0.3-10 keV flux is estimated as (4.0+/-1.0)X10^-12 and (4.4+/-0.7)X10^-12 erg/cm^2/s suggesting a high flux state compared to its previous state. The corresponding photon index is 1.4+/-0.5 and 1.21+/-0.22 suggesting the harder when brighter trend.
Our proposed ToO monitoring will continue to monitor this source. We encourage further multi-wavelength monitoring of this object. We would also like to thank the Swift Team for the extremely rapid and efficient scheduling of the ToO observations.
