Swift GRB210621.71: Global MASTER-Net observations report
Abstract
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB210621.71 (trigger No 1057131,15h 55m 14.88s , -54d 03m 46.8s, R=0.05) errorbox 79 sec after trigger time at 2021-06-21 17:05:55 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 43 deg. The sun altitude is -17.3 deg. The galactic latitude b = -1 deg., longitude l = 328 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1641828 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 89 | MASTER-SAAO | P\ | 20 | 15.6 | 129 | MASTER-SAAO | P\ | 20 | 16.0 | 173 | MASTER-SAAO | P\ | 30 | 16.1 | 228 | MASTER-SAAO | P\ | 40 | 15.6 | 292 | MASTER-SAAO | P\ | 50 | 16.6 | 372 | MASTER-SAAO | P\ | 70 | 16.6 | The observation and reduction will continue. The message may be cited.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- June 2021
- Bibcode:
- 2021GCN.30295....1L