Fermi GRB 240421A: 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) started inspect of the Fermi GRB 240421A ( Fermi GBM team, GCN 36204) errorbox 42622 sec after notice time and 42658 sec after trigger time at 2024-04-21 17:12:58 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -13.9 deg. The galactic latitude b = -32 deg., longitude l = 313 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2430011 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (20h 50m 46.74s , -82d 18m 27.9s) | C | 60 | 14.2 | 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (21h 03m 23.96s , -82d 31m 37.4s) | C | 60 | 14.4 | 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 29m 07.64s , -78d 43m 31.0s) | C | 60 | 14.5 | 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 20m 41.90s , -78d 30m 17.8s) | C | 60 | 14.2 | 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 24m 07.82s , -84d 24m 28.5s) | C | 60 | 16.7 | 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 07m 14.94s , -84d 11m 11.3s) | C | 60 | 16.6 | 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (19h 08m 34.69s , -82d 29m 18.5s) | C | 60 | 15.9 | 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (18h 55m 46.97s , -82d 15m 59.6s) | C | 60 | 15.8 | 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.36212....1L