SGR 1935+2154: MASTER optical observations
Abstract
MASTER Global Robotic Net (http://observ.pereplet.ru,Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) started SGR 1935+2154 (Barthelmy et al., GCN 27657, 19h 34m 56s +21d 53' 43", er.b. 3') error-box observations at 2020-04-27 21:57:38UT (3.5h after Swift trigger). MASTER-Tavrida observed it since 2020-04-27 21:57:38UT to 2020-04-28 00:32:48UT with unfiltered mlim=20.0m (observations began at altitute 26deg, the sun altitude was -31deg.) MASTER-SAAO observed error-box since 2020-04-28 00:34:53 (target altitude 18deg, Sun alt.-57deg) to 2020-04-28 04:03:37UT with unfiltered mlim~19-20.2 MASTER-IAC observed error-box 1.5h since 2020-04-28 04:12:42 (target altitude = 66deg, sun alt.-23deg) with unfiltered mlim=19.7-20. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/event.php?id=1345392 The next alert of this SGR was from Integral (trigger time 2020-04-28 14:34:24 UT, Mereghetti et al. GCN 27668) MASTER-Amur and MASTER-Tunka observed it automatically started at 14:34:46UT (22s after trigger time) and at 2020-04-28 14:40:28 UT, Lipunov et al. GCN 27666. Real time updated cover map and possible OT will be available at: https://master.sai.msu.ru/site/master2/observ.php?id=1345998
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2020
- Bibcode:
- 2020GCN.27670....1L