GRB 221009A: MuSCAT3 observations
Abstract
We have monitored the afterglow of GRB 221009A since three days after the Swift and Fermi alerts (GCN 32632; GCN 32636) by MuSCAT3 on the 2-meter telescope at Las Cumbres Observatory. MuSCAT3 is multi-channel imagers with the filters of SDSS g', r', i', zs, which is designed for observing transiting exoplanets. https://lco.global/observatory/instruments/muscat3/ The measurements are here: BJD Mag Err Filter 2459864.82404 21.33 0.15 g 2459864.82404 20.01 0.03 r 2459864.82404 19.48 0.03 i 2459864.82404 18.26 0.01 z 2459870.80681 23.55 0.21 g 2459870.80681 21.74 0.05 r 2459870.80681 20.47 0.04 i 2459870.80681 19.90 0.03 z 2459872.82760 23.64 0.26 g 2459872.82760 21.91 0.07 r 2459872.82760 20.82 0.06 i 2459872.82760 20.22 0.05 z 2459876.80690 23.99 0.34 g 2459876.80690 21.96 0.09 r 2459876.80690 21.00 0.08 i 2459876.80690 20.50 0.07 z By plotting these data with the other optical measurements reported to GCN (GCNs 32625, 32640, 32644, 32645, 32646, 32652, 32659, 32662, 32666, 32667, 32670, 32678, 32679, 32692, 32693, 32705, 32709, 32729, 32730, 32743, 32750, 32758, 32769, 32771, 32799, 32809, 32818), we found that the optical afterglow light curve shows a power-law decay, and only i'-band light curve fluctuates along the decline possibly because of systematic errors. We did not find a bump reported by GCN 32818 at least around a week after the Swift and Fermi trigger. If you have any queries, please contact M. Kimura at the following address. mariko.kimura@riken.jp
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2022
- Bibcode:
- 2022GCN.33038....1K