GRB 240318A
GCN Circular 35949
Subject
GRB 240318A: Fermi GBM Final Real-time Localization
Date
2024-03-18T03:01:31Z (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 02:51:01 UT on 18 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240318A (trigger 732423066.81932 / 240318119).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 275.1, Dec = -5.0 (J2000 degrees, equivalent to J2000 18h 20m, -5d 00'), with a statistical uncertainty of 4.8 degrees.
The angle from the Fermi LAT boresight is 53.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240318119/quicklook/glg_skymap_all_bn240318119.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/bn240318119/quicklook/glg_healpix_all_bn240318119.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240318119/quicklook/glg_lc_medres34_bn240318119.gif
GCN Circular 35950
Subject
Fermi GRB 240318A: Global MASTER-Net observations report
Date
2024-03-18T03:30:37Z (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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240318A ( Fermi GBM team, GCN 35949) errorbox 45 sec after notice time and 77 sec after trigger time at 2024-03-18 02:52:19 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 55 deg. The sun altitude is -11.1 deg.
MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240318A errorbox 52 sec after notice time and 84 sec after trigger time at 2024-03-18 02:52:25 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 47 deg. The sun altitude is -23.4 deg.
The galactic latitude b = 4 deg., longitude l = 25 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2401036
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
88 | 2024-03-18 02:52:19 | MASTER-Tavrida | (18h 47m 01.74s , -04d 52m 07.6s) | C | 20 | 16.5 |
94 | 2024-03-18 02:52:25 | MASTER-SAAO | (18h 42m 40.28s , -05d 38m 11.7s) | C | 20 | 17.5 |
94 | 2024-03-18 02:52:25 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 58.7s) | C | 20 | 17.4 |
117 | 2024-03-18 02:52:48 | MASTER-Tavrida | (18h 47m 05.23s , -04d 51m 08.3s) | C | 20 | 16.5 |
134 | 2024-03-18 02:53:05 | MASTER-SAAO | (18h 42m 40.33s , -05d 38m 08.3s) | C | 20 | 17.5 |
134 | 2024-03-18 02:53:05 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 54.8s) | C | 20 | 17.4 |
149 | 2024-03-18 02:53:16 | MASTER-Tavrida | (18h 46m 58.27s , -04d 51m 41.1s) | C | 30 | 16.6 |
178 | 2024-03-18 02:53:44 | MASTER-SAAO | (18h 42m 40.38s , -05d 38m 05.3s) | C | 30 | 17.6 |
178 | 2024-03-18 02:53:44 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 51.9s) | C | 30 | 17.6 |
187 | 2024-03-18 02:53:53 | MASTER-Tavrida | (18h 46m 58.14s , -04d 50m 44.1s) | C | 30 | 16.6 |
228 | 2024-03-18 02:54:29 | MASTER-Tavrida | (18h 47m 04.89s , -04d 51m 46.9s) | C | 40 | 16.6 |
232 | 2024-03-18 02:54:34 | MASTER-SAAO | (18h 42m 40.45s , -05d 38m 02.3s) | C | 40 | 17.6 |
232 | 2024-03-18 02:54:34 | MASTER-SAAO | (18h 40m 48.53s , -05d 24m 48.9s) | C | 40 | 17.6 |
282 | 2024-03-18 02:55:18 | MASTER-Tavrida | (18h 46m 57.52s , -04d 52m 50.5s) | C | 50 | 16.5 |
345 | 2024-03-18 02:56:16 | MASTER-Tavrida | (18h 47m 03.45s , -04d 52m 44.2s) | C | 60 | 16.5 |
648 | 2024-03-18 03:00:49 | MASTER-Tavrida | (18h 22m 27.68s , -04d 26m 36.6s) | C | 120 | 16.4 |
787 | 2024-03-18 03:02:59 | MASTER-Tavrida | (18h 22m 25.32s , -04d 25m 45.6s) | C | 140 | 16.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 35959
Subject
GRB 240318A: Glowbug gamma-ray detection
Date
2024-03-18T19:01:13Z (a year ago)
From
C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>
Via
Web form
C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240318A, which was also detected by Fermi/GBM (GCN 35949).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-03-18 02:51:00.832 with a duration of 5.2 s and a total significance of about 14.4 sigma. The light curve comprises a single peak.
Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a poorly constrained power-law index and a cutoff energy ("Epeak") of 163 keV. The modeled 10-10000 keV fluence is 7.6e-07 erg/cm^2.
The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959
[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O
[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006
Distribution Statement A: Approved for public release. Distribution is unlimited.
GCN Circular 35969
Subject
GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
Date
2024-03-21T14:50:33Z (a year ago)
From
Jimmy DeLaunay at Penn State <delauj2@gmail.com>
Via
Web form
James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240318A onboard (T0: 2024-03-18T02:51:01.82 UTC, Fermi trig 732423066)
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.
The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 69.4 in a 4.096 s analysis time bin, starting at T0.
NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -292.
See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.
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 35974
Subject
GRB 240318A: Fermi GBM Observation
Date
2024-03-21T21:31:30Z (a year ago)
From
Lorenzo Scotton at UAH <lscottongcn@outlook.com>
Via
Web form
L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 02:51:01.82 UT on 18 March 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240318A (trigger 732423066/240318119),
which was also detected by Glowbug (Cheung et al. 2024, GCN 35959)
and Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35969).
The Fermi GBM Final Real-time Localization was provided in GCN 35949.
The angle from the Fermi LAT boresight is 53 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 8 s (50-300 keV). The time-averaged spectrum
from T0-2.0 to T0+11.0 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.5 +/- 0.2 and the cutoff energy,
parameterized as Epeak, is 112 +/- 8 keV.
The event fluence (10-1000 keV) in this time interval is
(2.1 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.1 s in the 10-1000 keV band is 4.5 +/- 0.3 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/"