Swift GRB240221.92: Global MASTER-Net observations report
Abstract
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB240221.92 (trigger No 1216743,16h 21m 22.32s , -15d 40m 33.6s, R=0.00130556) errorbox 2112 sec after notice time and 2135 sec after trigger time at 2024-02-21 22:44:39 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 67 deg. The sun altitude is -13.8 deg. The galactic latitude b = 23 deg., longitude l = 360 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2383502 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 2146 | MASTER-Tunka | C | 20 | 17.4 | 2166 | MASTER-Tunka | C | 60 | 17.9 | Coadd 2176 | MASTER-Tunka | C | 20 | 17.2 | 2208 | MASTER-Tunka | C | 20 | 17.2 | 2239 | MASTER-Tunka | C | 20 | 17.4 | 2268 | MASTER-Tunka | C | 15 | 17.2 | 2292 | MASTER-Tunka | C | 15 | 16.9 | 2319 | MASTER-Tunka | C | 15 | 17.2 | 2343 | MASTER-Tunka | C | 15 | 17.1 | 2461 | MASTER-Tunka | C | 15 | 17.2 | 2485 | MASTER-Tunka | C | 15 | 17.0 | 2596 | MASTER-Tunka | C | 15 | 17.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2024
- Bibcode:
- 2024GCN.35766....1L