GCN Circular 35499
Subject
IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources
Date
2024-01-08T17:04:31Z (a year ago)
From
Kuiyun Huang at CYCU <kuiyun@gmail.com>
Via
legacy email
K.Y. Huang and Y. Urata, on behalf of a large collaboration
SCUBA2 onboard JCMT captured images in 450um and 850um encompassing
the entire 90% PSF containment region of IceCube-240105A (GCN
Circ. #35485) on January 6, 2024. No sources with an rms of 7 mJy were
detected within the 90% PSF containment region of IceCube-240105A. However,
the 850μm map revealed the presence of two bright sources near the
periphery of the 90% PSF containment region. These sources are identified
as PKS 0446+11 and the flat spectrum radio quasar (or Blazar, hereafter
J0448+1127), previously cataloged in various publications.
SCUBA2 measured the peak flux for PKS 0446+11 as
1130 mJy at 850um
838 mJy at 450um
Combined with the ALMA calibrator source catalog, the light curve
peaked on November 5, 2023. The SCUBA2 measurement indicates a slight
fading from the peak.
The other source, J0448+1127, is located at 04:49:07.754 +11:21:31
with 13 arcsec error, 0.48 deg away from the IceCube's best-fit
position. Catalog matching indicates the source is FSRQ, with redshift
1.375 recorded in various catalogs. SCUBA2 measured the peak flux as
104 mJy at 850um. Although there are no suitable reference observations for
variability checking, the source may exhibit brightening based on
comparisons with the last observation by ALMA in 2021 with a similar
wavelength.