Fermi GRB 240421B: Global MASTER-Net observations report
Abstract
MASTER-Tavrida robotic telescope (Global MASTER-Net:http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240421B ( C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of et al., GCN 36218) errorbox 19358 sec after notice time and 56607 sec after trigger time at 2024-04-22 01:26:08 UT, with upper limit up to 17.1 mag. Observations started at twilight. The observations began at zenith distance = 67 deg. The sun altitude is -14.1 deg. The galactic latitude b = -22 deg., longitude l = 22 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2430649 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 56637 | 2024-04-22 01:26:08 | MASTER-Tavrida | (19h 37m 21.45s , -18d 16m 09.9s) | C | 60 | 16.4 | 56785 | 2024-04-22 01:28:36 | MASTER-Tavrida | (19h 53m 26.05s , -18d 16m 57.8s) | C | 60 | 14.1 | 56858 | 2024-04-22 01:29:50 | MASTER-Tavrida | (19h 49m 21.85s , -22d 05m 18.0s) | C | 60 | 14.2 | 57563 | 2024-04-22 01:41:35 | MASTER-Tavrida | (19h 50m 44.40s , -20d 11m 20.7s) | C | 60 | 15.8 | 57636 | 2024-04-22 01:42:47 | MASTER-Tavrida | (19h 59m 17.11s , -20d 10m 02.0s) | C | 60 | 16.6 | 57709 | 2024-04-22 01:44:00 | MASTER-Tavrida | (19h 37m 21.08s , -18d 16m 19.0s) | C | 60 | 17.1 | 57782 | 2024-04-22 01:45:13 | MASTER-Tavrida | (19h 45m 45.17s , -18d 15m 26.6s) | C | 60 | 17.0 | 57926 | 2024-04-22 01:47:38 | MASTER-Tavrida | (19h 43m 02.18s , -20d 11m 33.0s) | C | 60 | 16.8 | 57999 | 2024-04-22 01:48:50 | MASTER-Tavrida | (19h 53m 25.96s , -18d 17m 25.9s) | C | 60 | 16.7 | 58144 | 2024-04-22 01:51:16 | MASTER-Tavrida | (19h 49m 20.84s , -22d 05m 40.1s) | C | 60 | 14.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2024
- Bibcode:
- 2024GCN.36220....1L