GRB 230807A
GCN Circular 34361
Subject
GRB 230807A: Fermi GBM Final Real-time Localization
Date
2023-08-07T22:35:36Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 22:25:01 UT on 7 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230807A (trigger 713139906.818582 / 230807934).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 73.3, Dec = -51.0 (J2000 degrees, equivalent to J2000 04h 53m, -51d 00'), with a statistical uncertainty of 3.5 degrees.
The angle from the Fermi LAT boresight is 96.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_skymap_all_bn230807934.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_healpix_all_bn230807934.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230807934/quicklook/glg_lc_medres34_bn230807934.gif
GCN Circular 34363
Subject
Fermi GRB 230807A: Global MASTER-Net observations report
Date
2023-08-08T00:45:47Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin
(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
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
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 230807A ( Fermi GBM team, GCN 34361) errorbox 740 sec after notice time and 775 sec after trigger time at 2023-08-07 22:37:57 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 80 deg. The sun altitude is -74.3 deg.
The galactic latitude b = -39 deg., longitude l = 258 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2251439
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
805 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 60 | 17.3 |
865 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 52m 47.80s , -51d 03m 55.2s) | C | 180 | 17.9 | Coadd
805 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.23s , -51d 03m 20.2s) | C | 60 | 17.4 |
865 | 2023-08-07 22:37:57 | MASTER-SAAO | (04h 51m 35.21s , -51d 03m 20.2s) | C | 180 | 18.1 | Coadd
885 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 52m 47.69s , -51d 02m 55.7s) | C | 60 | 17.2 |
885 | 2023-08-07 22:39:16 | MASTER-SAAO | (04h 51m 35.14s , -51d 02m 20.1s) | C | 60 | 17.3 |
977 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 52m 53.74s , -51d 03m 56.6s) | C | 60 | 17.3 |
977 | 2023-08-07 22:40:48 | MASTER-SAAO | (04h 51m 41.02s , -51d 03m 21.5s) | C | 60 | 17.4 |
1067 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 52m 46.43s , -51d 04m 58.9s) | C | 60 | 16.9 |
1067 | 2023-08-07 22:42:19 | MASTER-SAAO | (04h 51m 33.61s , -51d 04m 23.3s) | C | 60 | 17.1 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.