GRB 240305A
GCN Circular 35869
Subject
GRB 240305A: Fermi GBM Final Real-time Localization
Date
2024-03-05T09:59:51Z (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 LONG GRB
At 09:49:21 UT on 5 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240305A (trigger 731324966.26389 / 240305409).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 21.1, Dec = -42.1 (J2000 degrees, equivalent to J2000 01h 24m, -42d 06'), with a statistical uncertainty of 9.8 degrees.
The angle from the Fermi LAT boresight is 67.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_skymap_all_bn240305409.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/bn240305409/quicklook/glg_healpix_all_bn240305409.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_lc_medres34_bn240305409.gif
GCN Circular 35880
Subject
GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
Date
2024-03-05T21:56:16Z (a year ago)
From
Jimmy DeLaunay at Penn State <delauj2@gmail.com>
Via
Web form
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240305A onboard (T0: 2024-03-05T09:49:21.26 UTC, Fermi/GBM trigger 731324994).
The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
In ground analysis of the available TTE data, we find the position of
the burst with SNR 9.7 in the image domain using a slew mosaic technique.
The BAT position is
RA, Dec = 6.278, -43.904, which is:
RA (J2000) 00h 25m 06.72s
Dec (J2000) -43d 54' 14.4"
with an estimated uncertainty of 5 arcminutes
XRT and UVOT will not follow-up due to sun constraints.
Results of follow-up observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft
commanding pipeline designed for targeted recovery of BAT event mode
data around the times of compelling astrophysical events to enable
more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be
found at: https://www.swift.psu.edu/guano/
GCN Circular 35888
Subject
GRB 240305A: Fermi GBM observation
Date
2024-03-06T15:13:50Z (a year ago)
From
Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>
Via
Web form
E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 09:49:21.26 UT on 05 March 2024, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 240305A (trigger 731324966 / 240305409),
which was also detected by the Swift/BAT GUANO (DeLaunay et al. 2024, GCN 35880).
The Fermi GBM Final Real-time Localization (GCN 35869)
is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 56 degrees.
The GBM light curve consists of a single weak emission episode
with a duration (T90) of about 13 s (50-300 keV).
The time-averaged spectrum from T0-2.3 s to T0+10.2 s is
best fit by a simple power law function with index -2.06 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(1.29 +/- 0.12)e-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.0 s in the 10-1000 keV band
is 2.05 +/- 0.19 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 35890
Subject
Fermi GRB 240305A: Global MASTER-Net observations report
Date
2024-03-06T19:30:41Z (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-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 240305A ( Fermi GBM team, GCN 35869) errorbox 1 days 30310 sec after notice time and 1 days 30342 sec after trigger time at 2024-03-06 18:15:03 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenith distance = 55 deg. The sun altitude is -14.9 deg.
The galactic latitude b = -74 deg., longitude l = 279 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2391924
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
116772 | 2024-03-06 18:15:03 | MASTER-SAAO | (01h 52m 23.63s , -44d 32m 26.3s) | C | 60 | 13.7 |
117330 | 2024-03-06 18:24:20 | MASTER-SAAO | (01h 23m 00.92s , -38d 48m 51.7s) | C | 60 | 12.3 |
118229 | 2024-03-06 18:39:19 | MASTER-SAAO | (01h 36m 10.23s , -42d 27m 04.8s) | C | 60 | 13.2 |
118229 | 2024-03-06 18:39:19 | MASTER-SAAO | (01h 42m 50.95s , -42d 39m 23.8s) | C | 60 | 15.1 |
118309 | 2024-03-06 18:40:39 | MASTER-SAAO | (01h 30m 42.38s , -38d 40m 29.4s) | C | 60 | 14.5 |
118309 | 2024-03-06 18:40:39 | MASTER-SAAO | (01h 37m 00.55s , -38d 52m 46.6s) | C | 60 | 13.7 |
118388 | 2024-03-06 18:41:59 | MASTER-SAAO | (01h 20m 49.84s , -46d 15m 01.5s) | C | 60 | 16.2 |
118388 | 2024-03-06 18:41:59 | MASTER-SAAO | (01h 27m 56.71s , -46d 27m 27.1s) | C | 60 | 15.7 |
118468 | 2024-03-06 18:43:19 | MASTER-SAAO | (00h 54m 49.20s , -42d 27m 18.8s) | C | 60 | 17.2 |
118468 | 2024-03-06 18:43:19 | MASTER-SAAO | (01h 01m 28.21s , -42d 39m 44.6s) | C | 60 | 15.0 |
118548 | 2024-03-06 18:44:38 | MASTER-SAAO | (01h 39m 17.93s , -44d 20m 50.7s) | C | 60 | 15.4 |
118548 | 2024-03-06 18:44:38 | MASTER-SAAO | (01h 46m 10.88s , -44d 33m 13.0s) | C | 60 | 15.3 |
118627 | 2024-03-06 18:45:58 | MASTER-SAAO | (00h 56m 45.33s , -44d 21m 16.1s) | C | 60 | 18.3 |
118627 | 2024-03-06 18:45:58 | MASTER-SAAO | (01h 03m 37.12s , -44d 33m 43.9s) | C | 60 | 18.3 |
118707 | 2024-03-06 18:47:18 | MASTER-SAAO | (00h 53m 11.03s , -40d 34m 12.1s) | C | 60 | 19.2 |
118707 | 2024-03-06 18:47:18 | MASTER-SAAO | (00h 59m 38.30s , -40d 46m 36.9s) | C | 60 | 19.4 |
118787 | 2024-03-06 18:48:38 | MASTER-SAAO | (01h 15m 34.39s , -42d 28m 26.0s) | C | 60 | 19.4 |
118787 | 2024-03-06 18:48:38 | MASTER-SAAO | (01h 22m 13.76s , -42d 40m 50.0s) | C | 60 | 19.3 |
118866 | 2024-03-06 18:49:57 | MASTER-SAAO | (01h 13m 16.50s , -40d 32m 48.9s) | C | 60 | 19.3 |
118866 | 2024-03-06 18:49:57 | MASTER-SAAO | (01h 19m 43.99s , -40d 45m 11.2s) | C | 60 | 19.3 |
118946 | 2024-03-06 18:51:17 | MASTER-SAAO | (01h 18m 00.60s , -44d 22m 20.9s) | C | 60 | 19.4 |
118946 | 2024-03-06 18:51:17 | MASTER-SAAO | (01h 24m 52.76s , -44d 34m 46.7s) | C | 60 | 19.4 |
119026 | 2024-03-06 18:52:37 | MASTER-SAAO | (01h 33m 22.27s , -40d 32m 35.9s) | C | 60 | 19.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.