GRB 250319B
GCN Circular 39783
Subject
GRB 250319B: Fermi GBM Final Localization
Date
2025-03-19T15:50:43Z (2 months ago)
From
Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 05:07:28.91 UT on 19 March 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250319B (trigger 764053653/250319214).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 246.18, Dec = -70.90 (J2000 degrees, equivalent to J2000 16h 25m, 70d 54'),
with a statistical uncertainty of 3.18 degrees.
The angle from the Fermi LAT boresight is 29 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250319214/quicklook/glg_skymap_all_bn250319214.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250319214/quicklook/glg_healpix_all_bn250319214.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250319214/quicklook/glg_lc_medres34_bn250319214.gif"
GCN Circular 39788
Subject
Fermi GRB 250319B: Global MASTER-Net observations report
Date
2025-03-20T05:30:23Z (2 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
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 250319B ( Fermi GBM team, GCN 39783) errorbox 44851 sec after notice time and 82295 sec after trigger time at 2025-03-20 03:59:04 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 40 deg. The sun altitude is -9.9 deg.
The galactic latitude b = -15 deg., longitude l = 319 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2817489
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
82326 | 2025-03-20 03:59:04 | MASTER-SAAO | (16h 07m 31.63s , -71d 07m 28.6s) | C | 60 | 16.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.