GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
Abstract
Regarding the new magnetar SGR J1555.2-5402 discovered by Swift/BAT (GCN #30120), there was no GECAM in-flight trigger or on-ground automated blind search trigger around the BAT trigger time (2021-06-03T09:45:46). Thus, we implemented a targeted search for sub-threshold burst signals from +/-35 s around BAT trigger time, using an improved coherent search algorithm (C. Cai, In preparation, L. Blackburn et al.). From the targeted search, we found a short soft burst at 2021-06-03T09:45:46.670, with the most significant timescale of 10 ms. Its location is consistent with the Swift/BAT position (GCN #30120) and the spectrum is soft (Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7). We conclude this bursts is from SGR J1555.2-5402. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/76412746.67energys.pdf Please note that all GECAM results here are preliminary. The final analysis will be published in journal papers or GECAM online catalog. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time), which was funded by the Chinese Academy of Sciences (CAS).
- Publication:
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GRB Coordinates Network
- Pub Date:
- June 2021
- Bibcode:
- 2021GCN.30140....1C