Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 32059

GRB 220514A: MITSuME Akeno optical observation
2022-05-18T03:30:34Z (2 years ago)
Katsuhiro L. Murata at Nagoya U <>
K. L. Murata, R. Hosokawa, Y. Imai,  N. Ito,  M. Sasada, M. Niwano, Y.
Takamatsu, S. Sato, M. Tateda, T. Hattori, Y. Yatsu, and N. Kawai (Tokyo
Tech) report on behalf of the MITSuME collaboration:

We observed the field of GRB 220514A (Fermi GBM team et al. GCN Circular
#32038, Biltzinger et al. GCN Circular #32039, Mereghetti et al. GCN
Circular #32041, Lipunov et al. GCN Circular #32042, de Wet et al. GCN
Circular #32044, Zheng et al. GCN Circular #32051, Bissaldi et al. GCN
Circular #32054, Yan et al. GCN Circular #32058) with the optical three
color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope

The observation with a series of 60 sec exposures started at 2022-05-14
12:25:15 UT(47 seconds after the Fermi/GBM trigger). We stacked the images
with good conditions. Here we report magnitudes by the forced-photometry at
the position of the optical afterglow (GCN Circulars # 32044, #32051,
#32058) and 5-sigma limits.

T0+[hour] |MID-UT | T-EXP[sec] | magnitudes of forced-photometry | 5-sigma
0.77 | 2022-05-14 13:10:41 | 660 | g' = 19.6 +/- 0.9, Rc = 19.3 +/- 0.7, Ic
= 18.3 +/- 0.5 | g' > 17.7, Rc > 18.0, Ic > 17.5
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used the PS1 catalog for flux calibration. The magnitudes are expressed
in the AB system. The images were processed in real-time through the
MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1,
Pages 4-24;
Looking for U.S. government information and services? Visit