GRB240421A

This page lists all entries on GRB240421A in GRBweb

Summary Fermi GBM GCN 36204 GCN 36212 GCN 36232

Summary table
Variable Value Source
GRB_name_Fermi GRB240421224
T0 5:21:54.781 UTC Fermi_GBM
ra 314.1900° Fermi_GBM
decl -80.2300° Fermi_GBM
pos_error 6.46e+00° Fermi_GBM
T90 4.096 s Fermi_GBM
T90_error 1.864 s Fermi_GBM
T90_start 5:21:54.781 UTC Fermi_GBM
fluence 5.31e-06 erg/cm² Fermi_GBM
fluence_error 9.33e-06 erg/cm² Fermi_GBM
T100 4.096 s
GBM_located True
mjd 60421.22355070602 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB240421224
trigger_name bn240421224
ra 314.1900°
decl -80.2300°
pos_error 6.46e+00°
datum 2024-04-21
t_trigger 5:21:59.901 UTC
T90 4.096 s
T90_error 1.864 s
T90_start 5:21:54.781 UTC
fluence 5.31e-06 erg/cm²
fluence_error 9.33e-06 erg/cm²
flux_1024 2.37e+02 erg/cm²/s
flux_1024_error 1.67e+02 erg/cm²/s
flux_1024_time -3.07e+00 erg/cm²/s
flux_64 3.41e+03 erg/cm²/s
flux_64_error 2.53e+03 erg/cm²/s
GCN 36204 table
GRB_name GRB240421A
GCN_number 36204
Detection_method Fermi GBM final loc
t_trigger 5:21:59 UTC
ra 314.2000°
decl -80.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36204 SUBJECT: GRB 240421A: Fermi GBM Final Real-time Localization DATE: 24/04/21 05:32:35 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 05:21:59 UT on 21 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240421A (trigger 735369724.901026 / 240421224). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 314.2, Dec = -80.2 (J2000 degrees, equivalent to J2000 20h 56m, -80d 12'), with a statistical uncertainty of 7.5 degrees. The angle from the Fermi LAT boresight is 140.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240421224/quicklook/glg_skymap_all_bn240421224.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/bn240421224/quicklook/glg_healpix_all_bn240421224.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240421224/quicklook/glg_lc_medres34_bn240421224.gif
GCN 36212 table
GRB_name GRB240421A
GCN_number 36212
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36212 SUBJECT: Fermi GRB 240421A: Global MASTER-Net observations report DATE: 24/04/21 18:16:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 240421A ( Fermi GBM team, GCN 36204) errorbox 42622 sec after notice time and 42658 sec after trigger time at 2024-04-21 17:12:58 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -13.9 deg. The galactic latitude b = -32 deg., longitude l = 313 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2430011 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (20h 50m 46.74s , -82d 18m 27.9s) | C | 60 | 14.2 | 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (21h 03m 23.96s , -82d 31m 37.4s) | C | 60 | 14.4 | 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 29m 07.64s , -78d 43m 31.0s) | C | 60 | 14.5 | 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 20m 41.90s , -78d 30m 17.8s) | C | 60 | 14.2 | 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 24m 07.82s , -84d 24m 28.5s) | C | 60 | 16.7 | 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 07m 14.94s , -84d 11m 11.3s) | C | 60 | 16.6 | 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (19h 08m 34.69s , -82d 29m 18.5s) | C | 60 | 15.9 | 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (18h 55m 46.97s , -82d 15m 59.6s) | C | 60 | 15.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 36232 table
GRB_name GRB240421A
GCN_number 36232
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36232 SUBJECT: GRB 240421A: Glowbug gamma-ray detection DATE: 24/04/22 18:09:31 GMT FROM: C.C. Cheung at Naval Research Lab 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 240421A, which was also detected by Fermi/GBM (GCN 36204). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-04-21 05:21:56.632 with a duration of 2.0 s and a total significance of about 11.3 sigma. The light curve comprises a double-peaked structure. 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.