//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31380 SUBJECT: GRB 220104A: Fermi GBM Final Real-time Localization DATE: 22/01/04 04:11:29 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 04:01:02 UT on 4 Jan 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220104A (trigger 662961667.603716 / 220104167). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 197.8, Dec = 42.1 (J2000 degrees, equivalent to J2000 13h 11m, 42d 06'), with a statistical uncertainty of 3.1 degrees. The angle from the Fermi LAT boresight is 17.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220104167/quicklook/glg_skymap_all_bn220104167.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220104167/quicklook/glg_healpix_all_bn220104167.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220104167/quicklook/glg_lc_medres34_bn220104167.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31381 SUBJECT: Fermi GRB 220104A: Global MASTER-Net observations report DATE: 22/01/04 05:00:41 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB 220104A ( Fermi GBM team, GCN 31380) errorbox 581 sec after notice time and 619 sec after trigger time at 2022-01-04 04:11:22 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 40 deg. The sun altitude is -48.4 deg. The galactic latitude b = 75 deg., longitude l = 107 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1837544 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 680 | 2022-01-04 04:11:22 | MASTER-IAC | (13h 09m 03.78s , +42d 14m 31.9s) | P| | 120 | 18.3 | 680 | 2022-01-04 04:11:22 | MASTER-IAC | (13h 10m 16.14s , +42d 07m 48.5s) | P- | 120 | 17.9 | 835 | 2022-01-04 04:13:42 | MASTER-IAC | (13h 09m 03.68s , +42d 12m 57.0s) | P| | 150 | 18.5 | 835 | 2022-01-04 04:13:42 | MASTER-IAC | (13h 10m 16.14s , +42d 06m 14.2s) | P- | 150 | 18.0 | 1020 | 2022-01-04 04:16:32 | MASTER-IAC | (13h 09m 05.78s , +42d 14m 34.3s) | P| | 180 | 18.6 | 1020 | 2022-01-04 04:16:32 | MASTER-IAC | (13h 10m 18.33s , +42d 07m 51.9s) | P- | 180 | 18.3 | 1219 | 2022-01-04 04:19:52 | MASTER-IAC | (13h 09m 00.64s , +42d 13m 50.3s) | P| | 180 | 18.6 | 1219 | 2022-01-04 04:19:52 | MASTER-IAC | (13h 10m 13.28s , +42d 07m 08.1s) | P- | 180 | 18.3 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31382 SUBJECT: GRB 220104A：GECAM detection DATE: 22/01/04 08:29:45 GMT FROM: Guoying Zhao at IHEP Z. W. Guo, S. L. Xiong, C. Cai, S. Xiao, P. Zhang, C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song, J. C. Liu, Y. Zhao, Y. Q. Zhang, C. Zheng, W. C. Xue, C. W. Wang, Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li, X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen, J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang, H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li, X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun, Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang, C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang, X. Zhou, F. J. Lu, S. N. Zhang (IHEP) report on behalf of GECAM team: During the commissioning phase, GECAM-B was triggered in-flight by a long bright burst, GRB 220104A, at 2022-01-04T04:01:02.850 UTC (denoted as T0)， which was also observed by Fermi/GBM (GCN #31380). According to the BDS alert data, this burst mainly consists of a broad pulse with a duration of about 2 s. The GECAM light curve could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_94968062.png GECAM-B localized this burst to the following position (J2000): ra: 192.9 deg dec: 37.3 deg err: 10.1 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. The GECAM preliminary location could be found here: http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_sky_fit_94968062.png This position is consistent with the Fermi GBM team localization (trigger #662961667) within the error. 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). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31392 SUBJECT: GRB 220104A: Fermi GBM Observation DATE: 22/01/05 20:14:11 GMT FROM: Boyan A. Hristov at UAH Boyan A. Hristov (MPE/UAH) reports on behalf of the Fermi GBM Team: "At 04:01:02.60 UT on 04 January 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220104A (trigger 662961667 / 220104167) which was also detected by GECAM (Z. W. Guo et al. 2022, GCN 31382). The GBM on-ground location (GCN 31380) is consistent with the GECAM position. The GBM light curve consists of multiple peaks with a duration (T90) of about 2.624 s (50-300 keV). The time-averaged spectrum from T0-0.128 s to T0+0.320 s is best fit by a simple power law function with index -1.28 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (3.5 +/- 0.34)E-07 erg/cm^2. The 64-miliseconds peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 4.00 +/- 0.98 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"