GRB 240422A
GCN Circular 36222
Subject
GRB 240422A: Fermi GBM Final Real-time Localization
Date
2024-04-22T02:51:32Z (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 02:40:59 UT on 22 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240422A (trigger 735446464.467214 / 240422112).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 255.6, Dec = -67.4 (J2000 degrees, equivalent to J2000 17h 02m, -67d 24'), with a statistical uncertainty of 9.9 degrees.
The angle from the Fermi LAT boresight is 23.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240422112/quicklook/glg_skymap_all_bn240422112.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/bn240422112/quicklook/glg_healpix_all_bn240422112.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240422112/quicklook/glg_lc_medres34_bn240422112.gif
GCN Circular 36224
Subject
Fermi GRB 240422A: Global MASTER-Net observations report
Date
2024-04-22T05:31:57Z (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 240422A ( Fermi GBM team, GCN 36222) errorbox 2591 sec after notice time and 2626 sec after trigger time at 2024-04-22 03:24:46 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 45 deg. The sun altitude is -21.7 deg.
The galactic latitude b = -16 deg., longitude l = 324 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2430987
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
2657 | 2024-04-22 03:24:46 | MASTER-SAAO | (18h 35m 02.79s , -76d 43m 27.3s) | C | 60 | 19.1 |
3878 | 2024-04-22 03:45:07 | MASTER-SAAO | (18h 35m 34.85s , -76d 42m 39.4s) | C | 60 | 18.0 |
4038 | 2024-04-22 03:47:47 | MASTER-SAAO | (16h 59m 17.39s , -67d 19m 40.0s) | C | 60 | 18.8 |
4038 | 2024-04-22 03:47:47 | MASTER-SAAO | (16h 54m 35.38s , -67d 06m 21.1s) | C | 60 | 19.1 |
4118 | 2024-04-22 03:49:07 | MASTER-SAAO | (16h 57m 08.53s , -68d 58m 52.2s) | C | 60 | 19.3 |
4118 | 2024-04-22 03:49:07 | MASTER-SAAO | (17h 02m 14.07s , -69d 12m 12.4s) | C | 60 | 19.1 |
4198 | 2024-04-22 03:50:27 | MASTER-SAAO | (16h 53m 26.59s , -65d 11m 30.9s) | C | 60 | 19.1 |
4198 | 2024-04-22 03:50:27 | MASTER-SAAO | (16h 57m 48.08s , -65d 24m 47.4s) | C | 60 | 18.9 |
4277 | 2024-04-22 03:51:46 | MASTER-SAAO | (17h 33m 33.47s , -67d 07m 02.3s) | C | 60 | 19.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 36290
Subject
GRB 240422A: Glowbug gamma-ray detection
Date
2024-04-24T21:13:46Z (a year ago)
From
C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>
Via
Web form
R. Woolf, C.C. Cheung, 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 240422A, which was also detected by Fermi/GBM (GCN 36222).
The detection occurred during a time of high background, thus complicating the analysis. Using an adaptive window with a resolution of 32-ms, the initial peak seen in the GBM light curve was recovered, with a burst onset determined to be 2024-04-22 02:40:55.400 with a duration of 4.1 s and a total significance of about 8.0 sigma.
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.