GRB240227A

This page lists all entries on GRB240227A in GRBweb

Summary Fermi GBM IPN GCN 35814 GCN 35821 GCN 35825 GCN 35871 GCN 35874 GCN 35896

Summary table
Variable Value Source
GRB_name_Fermi GRB240227195
T0 4:40:12.986 UTC GCN_circulars,Konus-Wind Det
ra 18.6833° IPN
decl -34.0333° IPN
pos_error 3.53e+00° IPN
T90 1.6 s Fermi_GBM
T90_error 0.716 s Fermi_GBM
T90_start 4:40:15.164 UTC Fermi_GBM
fluence 4.67e-07 erg/cm² Fermi_GBM
fluence_error 1.47e-08 erg/cm² Fermi_GBM
T100 3.778 s
GBM_located False
mjd 60367.19459474537 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB240227195
trigger_name bn240227195
ra 69.5900°
decl -61.1700°
pos_error 7.39e+00°
datum 2024-02-27
t_trigger 4:40:15.164 UTC
T90 1.6 s
T90_error 0.716 s
T90_start 4:40:15.164 UTC
fluence 4.67e-07 erg/cm²
fluence_error 1.47e-08 erg/cm²
flux_1024 2.76e+00 erg/cm²/s
flux_1024_error 2.32e-01 erg/cm²/s
flux_1024_time -6.40e-02 erg/cm²/s
flux_64 5.93e+00 erg/cm²/s
flux_64_error 1.14e+00 erg/cm²/s
IPN table
GRB_name GRB240227A
ra 18.6833°
decl -34.0333°
pos_error 3.53e+00°
GCN 35814 table
GRB_name GRB240227A
GCN_number 35814
Detection_method Fermi GBM final loc
t_trigger 4:40:15 UTC
ra 69.6000°
decl -61.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35814 SUBJECT: GRB 240227A: Fermi GBM Final Real-time Localization DATE: 24/02/27 04:48:09 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 04:40:15 UT on 27 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240227A (trigger 730701620.164308 / 240227195). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 69.6, Dec = -61.2 (J2000 degrees, equivalent to J2000 04h 38m, -61d 12'), with a statistical uncertainty of 3.6 degrees. The angle from the Fermi LAT boresight is 13.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240227195/quicklook/glg_skymap_all_bn240227195.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/bn240227195/quicklook/glg_healpix_all_bn240227195.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240227195/quicklook/glg_lc_medres34_bn240227195.gif
GCN 35821 table
GRB_name GRB240227A
GCN_number 35821
Detection_method IPN Triangulation
t_trigger 4:40:15 UTC
ra 18.6830°
decl -34.0400°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35821 SUBJECT: IPN triangulation of GRB 240227A (short) DATE: 24/02/27 16:50:22 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The short-duration GRB 240227A (Fermi-GBM detection: The Fermi GBM team, GCN 35814) was detected by Fermi (GBM trigger 730701620), Konus-Wind, and INTEGRAL (SPI-ACS) at about 16815 s UT (04:40:15). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 18.683 (01h 14m 44s) -34.040 (-34d 02' 23") Corners: 19.224 (01h 16m 54s) -35.743 (-35d 44' 35") 18.820 (01h 15m 17s) -32.316 (-32d 18' 58") 18.123 (01h 12m 29s) -32.337 (-32d 20' 15") 18.499 (01h 14m 00s) -35.765 (-35d 45' 54") --------------------------------------------- The error box area is 2.02 sq. deg, and its maximum dimension is 3.53 deg (the minimum one is 35 arcmin). The Sun distance was 43 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240227_T16812/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN 35825 table
GRB_name GRB240227A
GCN_number 35825
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 35825 SUBJECT: Fermi GRB 240227A: Global MASTER-Net observations report DATE: 24/02/28 04:30:39 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 240227A ( Fermi GBM team, GCN 35814) errorbox 48100 sec after notice time and 48133 sec after trigger time at 2024-02-27 18:02:28 UT, with upper limit up to 18.0 mag. Observations started at twilight. The observations began at zenith distance = 32 deg. The sun altitude is -10.2 deg. The galactic latitude b = -39 deg., longitude l = 271 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2387115 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 48163 | 2024-02-27 18:02:28 | MASTER-SAAO | (04h 37m 02.73s , -61d 29m 49.8s) | C | 60 | 17.6 | 48163 | 2024-02-27 18:02:28 | MASTER-SAAO | (04h 55m 01.13s , -61d 40m 45.7s) | C | 60 | 17.3 | 48243 | 2024-02-27 18:03:47 | MASTER-SAAO | (04h 21m 16.28s , -59d 36m 59.5s) | C | 60 | 17.8 | 48243 | 2024-02-27 18:03:47 | MASTER-SAAO | (04h 38m 13.45s , -59d 47m 57.1s) | C | 60 | 17.4 | 48322 | 2024-02-27 18:05:07 | MASTER-SAAO | (04h 21m 36.67s , -63d 25m 43.7s) | C | 60 | 18.0 | 48322 | 2024-02-27 18:05:07 | MASTER-SAAO | (04h 40m 47.01s , -63d 36m 37.9s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 35871 table
GRB_name GRB240227A
GCN_number 35871
Detection_method IPN Triangulation
ra 18.7250°
decl -34.4100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35871 SUBJECT: Improved IPN triangulation of GRB 240227A (short) DATE: 24/03/05 14:16:50 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo team, J. Benkhoff on behalf of the BepiColombo team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team, and E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: Using the BepiColombo (MGNS) data we have improved the previous IPN error box (Svinkin et al., GCN 35821). The coordinates of the updated 3 sigma error box are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 18.725 (01h 14m 54s) -34.410 (-34d 24' 34") Corners: 18.512 (01h 14m 03s) -35.909 (-35d 54' 32") 18.933 (01h 15m 44s) -33.175 (-33d 10' 30") 18.900 (01h 15m 36s) -32.912 (-32d 54' 42") 18.488 (01h 13m 57s) -35.644 (-35d 38' 37") --------------------------------------------- The error box area is 561 sq. arcmin, and its maximum dimension is 3.01 deg (the minimum one is 3.4 arcmin). The Sun distance was 44 deg. This box may be further improved. Updated triangulation map and HEALPix FITS files are posted at http://www.ioffe.ru/LEA/GRBs/GRB240227_T16812/IPN/
GCN 35874 table
GRB_name GRB240227A
GCN_number 35874
Detection_method Konus-Wind Det
t_trigger 4:40:12.986 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35874 SUBJECT: Konus-Wind detection of GRB 240227A (short/hard) DATE: 24/03/05 16:30:28 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The short GRB 240227A (Fermi-GBM detection: The Fermi GBM team, GCN 35814; IPN triangulation: Svinkin et al., GCN 35821; Kozyrev et al., GCN 35871). triggered Konus-Wind (KW) at T0=16812.986 s UT (04:40:12.986). The burst light curve shows a single multi-peaked emission pulse which starts at ~T0-0.400 s and has a duration of ~0.5 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240227_T16812/ As observed by Konus-Wind, the burst had the total fluence of 1.72(-0.28,+0.36)x10^-6 erg/cm^2 and a 16-ms peak energy flux, measured from T0+0.032 s, of 8.21(-2.63,+3.09)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). Since a major part of the burst emission was detected before the trigger, a time-averaged spectral analysis was performed using the KW 3-channel light curve data. Modeling the 3-channel time-integrated spectrum (measured from T0-0.400 s to T0+0.096 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.47 (-0.24, + 0.28) and Ep = 688(-133,+222) keV. A multi-channel spectrum near the peak count rate (measured from T0 to T0+0.064 s) is best fit in the 20 keV - 15 MeV range by a CPL model with alpha = -0.12(-0.47,+0.70) and Ep = 759(-233,+403) keV (chi2 = 6.4/10 dof). All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN 35896 table
GRB_name GRB240227A
GCN_number 35896
Detection_method INTEGRAL
Circular_text TITLE: GCN CIRCULAR NUMBER: 35896 SUBJECT: GRB 240227A (short): Glowbug gamma-ray detection DATE: 24/03/07 14:42:02 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 the short GRB 240227A, which was also detected by Fermi/GBM, Konus/Wind, INTEGRAL/SPI-ACS, and BepiColombo (GCN 35814, 35821, 35871, 35874). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-02-27 04:40:14.152 with a duration of 0.51 s and a total significance of about 16.3 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 photon index dN/dE~E^x of x=1.0 and a cutoff energy ("Epeak") of 576 keV. The modeled 10-10000 keV fluence is 1.5e-06 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.