GRB 210430B
GCN Circular 29916
Subject
GRB 210430B: Fermi GBM Final Real-time Localization
Date
2021-04-30T21:52:37Z (4 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 21:42:17 UT on 30 Apr 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210430B (trigger 641511742.665196 / 210430904).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 348.2, Dec = 8.3 (J2000 degrees, equivalent to J2000 23h 12m, 8d 18'), with a statistical uncertainty of 6.5 degrees.
The angle from the Fermi LAT boresight is 76.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210430904/quicklook/glg_skymap_all_bn210430904.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210430904/quicklook/glg_healpix_all_bn210430904.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210430904/quicklook/glg_lc_medres34_bn210430904.gif
GCN Circular 29917
Subject
Fermi GRB 210430B: Global MASTER-Net observations report
Date
2021-04-30T23:45:14Z (4 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 210430B ( Fermi GBM team, GCN 29916) errorbox 6673 sec after notice time and 6710 sec after trigger time at 2021-04-30 23:34:08 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -23.0 deg.
The galactic latitude b = -47 deg., longitude l = 86 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1604728
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
6741 | 2021-04-30 23:34:08 | MASTER-Kislovodsk | (22h 47m 52.89s , +14d 03m 13.2s) | C | 60 | 16.9 |
6741 | 2021-04-30 23:34:08 | MASTER-Kislovodsk | (22h 51m 45.19s , +13d 39m 00.0s) | C | 60 | 17.1 |
6901 | 2021-04-30 23:36:49 | MASTER-Kislovodsk | (22h 43m 52.25s , +10d 04m 18.5s) | C | 60 | 16.9 |
6901 | 2021-04-30 23:36:49 | MASTER-Kislovodsk | (22h 47m 40.74s , +09d 40m 01.6s) | C | 60 | 16.9 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.