GRB 260219A
GCN Circular 43789
Subject
GRB 260219A: AstroSat CZTI detection
Date
2026-02-21T09:34:45Z (a month ago)
From
Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>
Via
Web form
M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (IUCAA), A. Arya (IITB), A. Goyal (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long,faint GRB 260219A which was also detected by Fermi GBM (Fermi GBM Team., GCN Circ. 43785), and GECAM-B (Jin-Peng Zhang et al., GCN Circ. 43787).
The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-02-19 14:04:53.66 UTC. The measured peak count rate associated with the burst is 345 (+63, -68) counts/s above the background in the combined data of all quadrants, with a total of 974 (+218, -254) counts. The local mean background count rate was 1127 (+7, -7) counts/s. We measure a T90 of 6.8 (+1.6, -1.3) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
GCN Circular 43787
Subject
GRB 260219A: GECAM-B observation of a long burst
Date
2026-02-20T11:47:59Z (a month ago)
From
zhangjinpeng@ihep.ac.cn
Via
Web form
Jin-Peng Zhang, Chen-Wei Wang, Shao-Lin Xiong (IHEP) report on behalf of GECAM team:
GECAM-B was triggered in-flight by GRB 260219A, at 2026-02-19T14:04:54.600 UTC (denoted as T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #43785).
According to the GECAM-B light curves in about 70-6000 keV, this burst mainly consists of one pulse, with a duration (T90) of 13 +/- 4 s.
The GECAM-B light curve can be found here:
https://www.bursthub.cn//admin/static/gecambgrb260219A.png
The time-averaged spectrum from T0 - 1.0 to T0 + 13.0 s (photon energy > 70 keV) is fitted by a power law function. The power law index is -2.16 +0.14/-0.16. The event fluence (10-1000 keV) in this time interval is (7.7 +0.9/-1.1)E-06 erg/cm^2.
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).
GCN Circular 43786
Subject
Fermi GRB 260219A: Global MASTER-Net observations report
Date
2026-02-19T18:36:32Z (a month ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko,
G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tunka robotic telescope [1] located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 260219A ( Fermi GBM team, GCN 43785) errorbox 8595 sec after notice time and 8760 sec after trigger time at 2026-02-19 16:30:53 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 44 deg. The sun altitude is -49.0 deg.
The galactic latitude b = 61 deg., longitude l = 245 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3145377
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
8790 | 2026-02-19 16:30:53 | MASTER-Tunka | (11h 07m 54.97s , +13d 08m 20.3s) | C | 60 | 19.0 |
8790 | 2026-02-19 16:30:53 | MASTER-Tunka | (11h 07m 34.84s , +13d 15m 31.6s) | C | 60 | 19.0 |
9759 | 2026-02-19 16:47:02 | MASTER-Tunka | (11h 03m 29.25s , +11d 14m 56.3s) | C | 60 | 19.4 |
9759 | 2026-02-19 16:47:02 | MASTER-Tunka | (11h 03m 09.30s , +11d 21m 54.5s) | C | 60 | 19.3 |
10877 | 2026-02-19 17:05:40 | MASTER-Tunka | (11h 18m 34.85s , +11d 21m 16.4s) | C | 60 | 19.7 |
10877 | 2026-02-19 17:05:40 | MASTER-Tunka | (11h 18m 55.04s , +11d 14m 26.8s) | C | 60 | 19.8 |
12397 | 2026-02-19 17:31:00 | MASTER-Tunka | (11h 15m 03.51s , +09d 19m 24.2s) | C | 60 | 17.4 |
12397 | 2026-02-19 17:31:00 | MASTER-Tunka | (11h 14m 42.55s , +09d 26m 02.0s) | C | 60 | 17.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html
GCN Circular 43785
Subject
GRB 260219A: Fermi GBM Final Real-time Localization
Date
2026-02-19T14:18:05Z (a month 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 14:04:53 UT on 19 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260219A (trigger 793202698.807012 / 260219587).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 167.4, Dec = 9.6 (J2000 degrees, equivalent to J2000 11h 09m, 9d 35'), with a statistical uncertainty of 2.7 degrees.
The angle from the Fermi LAT boresight is 97.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/quicklook/glg_skymap_all_bn260219587.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/quicklook/glg_healpix_all_bn260219587.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260219587/quicklook/glg_lc_medres34_bn260219587.gif