GRB 241207C: MASTER optical observations

MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the MAXI GRB241207C error-box (trigger No 2412072220, GCN #38462, notice time 2024-12-08T00:13:03UT ) 8462 sec after trigger time at 2024-12-08 00:41:09 UT,with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -13.9 deg. Distance to Moon is 34deg., distance to Sun is 47deg. The galactic latitude b = -31 deg., longitude l = 21 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2700028 We obtain the following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|_________________________________|_____|_______|_______|_ 8475 | 2024-12-08 00:41:09 | MASTER-OAFA | (20h 36m 54.99s -22d 53m 32.3s) | C | 25 | 16.6 | 8500 | 2024-12-08 00:41:09 | MASTER-OAFA | (20h 36m 54.99s -22d 53m 32.3s) | C | 75 | 17.3 | Coadd 8486 | 2024-12-08 00:41:09 | MASTER-OAFA | (20h 27m 07.85s -23d 14m 22.0s) | C | 45 | 17.9 | 8531 | 2024-12-08 00:41:09 | MASTER-OAFA | (20h 27m 07.85s -23d 14m 22.0s) | C | 345 | 19.0 | Coadd 8537 | 2024-12-08 00:42:11 | MASTER-OAFA | (20h 37m 00.75s -22d 54m 33.0s) | C | 25 | 16.6 | 8547 | 2024-12-08 00:42:11 | MASTER-OAFA | (20h 27m 13.60s -23d 15m 22.0s) | C | 45 | 18.1 | 8601 | 2024-12-08 00:43:14 | MASTER-OAFA | (20h 36m 55.72s -22d 55m 33.7s) | C | 25 | 16.8 | 8611 | 2024-12-08 00:43:15 | MASTER-OAFA | (20h 27m 08.52s -23d 16m 21.9s) | C | 45 | 18.1 | 8661 | 2024-12-08 00:44:15 | MASTER-OAFA | (20h 37m 01.73s -22d 55m 30.7s) | C | 25 | 16.8 | 8672 | 2024-12-08 00:44:15 | MASTER-OAFA | (20h 27m 14.60s -23d 16m 18.7s) | C | 45 | 18.0 | 8724 | 2024-12-08 00:45:18 | MASTER-OAFA | (20h 36m 58.39s -22d 53m 48.8s) | C | 25 | 16.9 | 8734 | 2024-12-08 00:45:18 | MASTER-OAFA | (20h 27m 11.43s -23d 14m 36.5s) | C | 45 | 18.2 | 8822 | 2024-12-08 00:46:18 | MASTER-OAFA | (20h 36m 58.46s -22d 55m 16.4s) | C | 100 | 17.7 | 8792 | 2024-12-08 00:46:19 | MASTER-OAFA | (20h 27m 11.44s -23d 16m 03.0s) | C | 40 | 18.2 | 8838 | 2024-12-08 00:47:05 | MASTER-OAFA | (20h 27m 11.45s -23d 16m 03.3s) | C | 40 | 18.2 | 8884 | 2024-12-08 00:47:50 | MASTER-OAFA | (20h 27m 11.44s -23d 16m 03.5s) | C | 40 | 18.2 | 8943 | 2024-12-08 00:48:49 | MASTER-OAFA | (20h 37m 01.58s -22d 54m 05.1s) | C | 40 | 17.4 | 8953 | 2024-12-08 00:48:50 | MASTER-OAFA | (20h 27m 14.72s -23d 14m 51.6s) | C | 60 | 18.5 | 9020 | 2024-12-08 00:50:07 | MASTER-OAFA | (20h 36m 55.16s -22d 54m 38.4s) | C | 40 | 17.3 | 9031 | 2024-12-08 00:50:07 | MASTER-OAFA | (20h 27m 08.24s -23d 15m 24.4s) | C | 60 | 18.4 | Filter C is a clear (unfiltred) band. Reduction will continue. The message may be cited.