GRB 240305C
GCN Circular 35881
Subject
GRB 240305C: Fermi GBM Final Real-time Localization
Date
2024-03-05T22:27:23Z (a year 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 SHORT GRB
At 22:16:36 UT on 5 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240305C (trigger 731369801.549802 / 240305928).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 261.1, Dec = -3.2 (J2000 degrees, equivalent to J2000 17h 24m, -3d 12'), with a statistical uncertainty of 9.1 degrees.
The angle from the Fermi LAT boresight is 74.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305928/quicklook/glg_skymap_all_bn240305928.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305928/quicklook/glg_healpix_all_bn240305928.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305928/quicklook/glg_lc_medres34_bn240305928.gif
GCN Circular 35882
Subject
Fermi GRB 240305C: Global MASTER-Net observations report
Date
2024-03-05T22:30:29Z (a year 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, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),
V. Yurkov, A. Gabovich
(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 240305C ( Fermi GBM team, GCN 35881) errorbox 390 sec after notice time and 423 sec after trigger time at 2024-03-05 22:23:40 UT, with upper limit up to 13.6 mag. The observations began at zenith distance = 77 deg. The sun altitude is -50.3 deg.
The galactic latitude b = 17 deg., longitude l = 20 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2392695
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
454 | 2024-03-05 22:23:40 | MASTER-Kislovodsk | (17h 01m 25.66s , +00d 55m 11.6s) | C | 60 | 13.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 35886
Subject
GRB 240305C: AstroSat CZTI detection of a short burst
Date
2024-03-06T08:35:52Z (a year ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>
Via
Web form
J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a short-duration GRB 240305C which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35881).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-03-05 22:16:36.87 UTC. The measured peak count rate associated with the burst is 606 (+300, -112) counts/s above the background in the combined data of three quadrants (out of four), with a total of 104 (+31, -29) counts. The local mean background count rate was 258 (+9, -16) counts/s. Using cumulative rates, we measure a T90 of 0.45 (+0.04, -0.12) s.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb