GRB 210522A: GECAM detection
Abstract
During the commissioning phase, GECAM-B triggered a long hard GRB, GRB 210522A, at 2021-05-22T22:11:44.450 UTC (denoted as T0), which was also observed by CALET/GBM, INTEGRAL/SPI-ACS and Konus-WIND. According to the GECAM-B light curves in about 8 keV-4 MeV, this burst mainly consists of multiple pulses with a duration of about 50s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_grd_75420704.45.png GECAM-B localized this burst to the following position (J2000): Ra: 90.06 deg Dec: 1.36 deg Err: 1.19 deg (1-sigma, statistical only) The current systematic error of location is estimated to be several degrees which could be minimized by the ongoing calibration. In addition, we derived a triangulation location for this burst using GECAM-B data together with public data of INTEGRAL-SPI/ACS and Konus-WIND, based on a novel method (S. Xiao, et al., submitted). Although there are two intersection regions of triangulation annuli, only one region is consistent with the above location given by GECAM-B alone, thus is the final location region (3-sigma), which could be defined as (J2000): Ra (deg) Dec (deg) Center 85.78, 2.09 Corner 83.67, 0.30 79.45, 2.09 90.00, 2.69 87.89, 3.88 The location map could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/location_gecamb_grd_75420704.png 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). We are very grateful for the public data of INTEGRAL-SPI/ACS and Konus-WIND.
- Publication:
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GRB Coordinates Network
- Pub Date:
- May 2021
- Bibcode:
- 2021GCN.30070....1L