GCN Circular 43727
Subject
GRB 260212A: SVOM/GRM observation of a long burst
Event
Date
2026-02-14T01:04:56Z (8 months ago)
From
zhangjinpeng@ihep.ac.cn
Via
Web form
SVOM/GRM team: Jin-Peng Zhang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Frédéric Daigne (IAP), Olivier GODET (IRAP)
Report on behalf of the SVOM team:
SVOM/GRM was triggered in-flight by GRB 260212A at 2026-02-12T17:49:08.000 (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN #43716) and Glowbug (C.C. Cheung et al., GCN #43719).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a T90 of 23.6 +1.4/-1.4 s in the 15-5000 keV band.
The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb260212A.png
In addition, the position of this burst, according to Fermi/GBM localization (RA = 228.9, Dec = 74.1, Fermi GBM Team, GCN #43716), is located at about 53 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view. ECLAIRs was not collecting data at the time of this burst.
With this localization, the time-averaged spectrum from T0-1.0 to T0+11.0 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -0.87 +0.07/-0.07 and the cutoff energy, parameterized as Epeak, is 116 +6/-5 keV. The event fluence (10-1000 keV) in this time interval is (7.24 +0.20/-0.19)E-06 erg/cm^2.
The 1s peak spectrum, measured from T0+8.8 to T0+9.8 s, is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -1.03 +0.09/-0.08 and the cutoff energy, parameterized as Epeak, is 157 +16/-13 keV. The flux (10-1000 keV) in this time interval is (1.88 +0.09/-0.08)E-06 erg/cm^2/s.
The localization of GRB 260212A in the 'Amati' relation diagram is shown at:
https://www.bursthub.cn//admin/static/svgrb260212A_amati.png
And the localization in the 'Yonetoku' relation diagram is shown at:
https://www.bursthub.cn//admin/static/svgrb260212A_yonetoku.png
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.
The SVOM/GRM point of contact for this burst is: Jin-Peng Zhang (IHEP) (zhangjinpeng@ihep.ac.cn)