Fermi GBM detects GRB 260212A with multiple pulses and significant fluence

AI Summary

GRB 260212A, detected by Fermi GBM and multiple observatories, exhibited a complex light curve with multiple pulses over 11.5 seconds, showing a fluence of (6.81 ± 0.55)x10^-6 erg/cm^2 and peak flux of (4.98 ± 0.40)x10^-6 erg/cm^2/s. Follow-up observations confirmed the burst's characteristics across various energy ranges.

Measurements

Notices (1)

Fermi GBM — GRB · Thu, 12 Feb 2026 17:49:08 GMT

GCN Circulars (9)

GCN-43772 — GRB 260212A · Tue, 17 Feb 2026 14:55:21 GMT
The Konus-Wind team reported the detection of a long-duration gamma-ray burst (GRB 260212A) with a fluence of (6.81 ± 0.55)x10^-6 erg/cm^2 and a peak flux of (4.98 ± 0.40)x10^-6 erg/cm^2/s. The burst had a duration of 11.5 seconds and a 68% confidence level.

GCN-43769 — GRB 260212A · Tue, 17 Feb 2026 12:10:47 GMT
A long-duration gamma-ray burst (GRB 260212A) was detected by multiple telescopes, including Fermi, Swift, Konus-Wind, Glowbug, SVOM, GECAM-B, Astrosat, and Mars-Odyssey. The event occurred at approximately 17:49:08 UT and was located with a preliminary 3 sigma error box, whose coordinates are RA(2000) = 224.837°, Dec(2000) = +74.800°, and has an area of 372 sq. arcmin and maximum dimension of 2.830 deg. The Sun distance was 106 deg.

GCN-43741 — GRB 260212A · Sat, 14 Feb 2026 21:38:15 GMT
A long gamma-ray burst (GRB) 260212A was detected by the AstroSat CZTI collaboration using data from the CsI anticoincidence (Veto) detector. The burst, also detected by Fermi GBM and Glowbug, was located in the 100-500 keV energy range and had a peak count rate of 641 counts/s above the background. The light curve showed multiple peaks, with the strongest at 17:49:08.04 UTC. The source was also faintly detected in the CZT detectors in the 20-200 keV energy range, with a peak count rate of 44 counts/s above the background. The TIFR-led AstroSat CZTI collaboration, funded by the Indian Space Research Organisation, regularly reports CZTI GRB detections at <http://astrosat.iucaa.in/czti/?q=grb>.

GCN-43740 — GRB 260212A · Sat, 14 Feb 2026 20:29:37 GMT
On February 12, 2026, the Fermi Gamma-ray Burst Monitor (GBM) detected a gamma-ray burst (GRB 260212A) with a duration of approximately 9.7 seconds. The burst was also observed by several other telescopes and instruments, including Glowbug, SVOM/GRM, and GECAM-B. The preliminary analysis of the Fermi GBM data suggests a power law function with an exponential high-energy cutoff for the time-averaged spectrum, with a power law index of -0.66 and a cutoff energy of 107 keV. The event fluence in the 10-1000 keV band is (7.1 ± 0.2)E-06 erg/cm^2, and the 1-sec peak photon flux is 16.2 ± 0.6 ph/s/cm^2. The spectral analysis results are preliminary and will be published in the GBM GRB Catalog.

GCN-43736 — GRB 260212A · Sat, 14 Feb 2026 13:54:35 GMT
GRB 260212A was detected by multiple observatories, including GECAM-B. The burst, which occurred on 2026-02-12T17:49:07.800 UTC, had a duration of approximately 24 seconds and a time-averaged fluence of (1.07 +0.09/-0.13)E-05 erg/cm^2 in the energy range of 10-1000 keV. The power law index of the time-averaged spectrum was found to be -2.53 +0.14/-0.15.

GCN-43727 — GRB 260212A · Sat, 14 Feb 2026 01:04:56 GMT
GRB 260212A, a long gamma-ray burst detected by the Space Variable Objects Monitor (SVOM) and other telescopes, was observed by SVOM/GRM and found to have a duration of 23.6 seconds and a fluence of 7.24E-06 erg/cm^2. The burst was located outside the field of view of SVOM/ECLAIRs. The light curve was analyzed and found to be best fitted by a power law function with an exponential high-energy cutoff. The event was significant as it provided valuable data for studying gamma-ray bursts and their properties.

GCN-43719 — GRB 260212A · Fri, 13 Feb 2026 03:41:12 GMT
The International Space Station's Glowbug gamma-ray telescope, operated by the U.S. Naval Research Laboratory, detected GRB 260212A, a gamma-ray burst also observed by Fermi/GBM. The burst had a duration of 10.5 seconds, two primary peaks, and a total significance of approximately 69 sigma.

GCN-43717 — GRB 260212A · Thu, 12 Feb 2026 19:15:22 GMT
The MASTER-Kislovodsk robotic telescope in Russia began observing Fermi GRB 260212A 585 seconds after the trigger time, obtaining upper limits on magnitudes ranging from 17.0 to 18.0 in clear band for various observations. The telescope's team will continue the observation and reduction process.

GCN-43716 — GRB 260212A · Thu, 12 Feb 2026 17:59:41 GMT
The Fermi Gamma-ray Burst Monitor (GBM) has detected and localized a Long Gamma-ray Burst (GRB), designated as GRB 260212A, at coordinates RA = 228.9, Dec = 74.1 (J2000), with a statistical uncertainty of 1.1 degrees. The angle from the Fermi Large Area Telescope (LAT) boresight is 127.0 degrees.