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GCN Circular 32158

GRB 220527A: Lick 3m Optical Observations
2022-06-02T23:05:53Z (2 years ago)
Weikang Zheng at UC Berkeley <>
WeiKang Zheng, Thomas G. Brink and Alexei V. Filippenko (UC Berkeley)
report on behalf of the KAIT GRB team:

We observed the field of GRB 220527A (AGILE detection: Ursi et al., GCN
32129; Fermi detection: Fermi GBM team, GCN 32130, Bissaldi et al., GCN
32131, Mangan et al., 32133; CALET detection: Yamaoka et al., GCN 32139;
AstroSat detection: Gopalakrishnan et al., GCN 32140; Konus-Wind detection:
Lysenko et al. GCN 32152)
with the 3m Shane telescope (located at Lick Observatory) on May 28
and 30 UT. Observations were performed in unfiltered images with the
Kast Dual Spectrograph simultaneously in both blue and red side with
the d57 dichroic. We detected the optical afterglow (Tohuvavohu et al.,
GCN 32136; Imai et al., GCN 32138; Xu et al., GCN 32141; de Wet et al.,
GCN 32143; D'Avanzo et al., GCN 32145; Sun et al., GCN 32146)
in our coadd images. We calibrated our blue side images to g band and
red side images to I band from the Pan-STARRS1 catalog. We measure its
brightness to be the following:

1.09d g = 20.3 +/- 0.2
1.09d I = 19.4 +/- 0.2
3.08d I = 21.2 +/- 0.3
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