GRB220211A

This page lists all entries on GRB220211A in GRBweb

Summary Fermi GBM GCN 31570 GCN 31571 GCN 31582 GCN 31584 GCN 31590 GCN 31591 GCN 31599 GCN 31600 GCN 31606 GCN 31626

Summary table
Variable Value Source
GRB_name_Fermi GRB220211047
T0 1:07:48 UTC GCN_circulars,Fermi GBM final loc
ra 203.6800° GCN_circulars,Optical
decl 33.2168° GCN_circulars,Optical
T90 0.448 s Fermi_GBM
T90_error 0.466 s Fermi_GBM
T90_start 1:07:48.493 UTC Fermi_GBM
fluence 1.56e-07 erg/cm² Fermi_GBM
fluence_error 2.81e-08 erg/cm² Fermi_GBM
redshift 0.5300 GCN_circulars,Fermi GBM Other
T100 0.941 s
GBM_located False
mjd 59621.04708333333 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB220211047
trigger_name bn220211047
ra 207.1700°
decl 39.9700°
pos_error 5.35e+00°
datum 2022-02-11
t_trigger 1:07:48.877 UTC
T90 0.448 s
T90_error 0.466 s
T90_start 1:07:48.493 UTC
fluence 1.56e-07 erg/cm²
fluence_error 2.81e-08 erg/cm²
flux_1024 2.56e+00 erg/cm²/s
flux_1024_error 4.87e-01 erg/cm²/s
flux_1024_time -4.48e-01 erg/cm²/s
flux_64 1.28e+01 erg/cm²/s
flux_64_error 2.69e+00 erg/cm²/s
GCN 31570 table
GRB_name GRB220211A
GCN_number 31570
Detection_method Fermi GBM final loc
t_trigger 1:07:48 UTC
ra 207.2000°
decl 40.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 31570 SUBJECT: GRB 220211A: Fermi GBM Final Real-time Localization DATE: 22/02/11 01:18:13 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 01:07:48 UT on 11 Feb 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220211A (trigger 666234473.877152 / 220211047). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 207.2, Dec = 40.0 (J2000 degrees, equivalent to J2000 13h 48m, 40d 00'), with a statistical uncertainty of 8.7 degrees. The angle from the Fermi LAT boresight is 145.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220211047/quicklook/glg_skymap_all_bn220211047.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/bn220211047/quicklook/glg_healpix_all_bn220211047.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220211047/quicklook/glg_lc_medres34_bn220211047.gif
GCN 31571 table
GRB_name GRB220211A
GCN_number 31571
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 31571 SUBJECT: Fermi GRB 220211A: Global MASTER-Net observations report DATE: 22/02/11 01:30:21 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 220211A ( Fermi GBM team, GCN 31570) errorbox 33 sec after notice time and 64 sec after trigger time at 2022-02-11 01:08:53 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 53 deg. The sun altitude is -76.1 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 220211A errorbox 54 sec after notice time and 85 sec after trigger time at 2022-02-11 01:09:14 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 6 deg. The sun altitude is -34.3 deg. The galactic latitude b = 72 deg., longitude l = 82 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1878703 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 69 | 2022-02-11 01:08:53 | MASTER-IAC | (13h 46m 25.74s , +40d 09m 02.1s) | P| | 10 | 15.9 | 69 | 2022-02-11 01:08:53 | MASTER-IAC | (13h 47m 33.50s , +40d 02m 18.2s) | P- | 10 | 16.0 | 95 | 2022-02-11 01:09:14 | MASTER-Kislovodsk | (13h 47m 31.06s , +40d 10m 14.0s) | C | 20 | 16.2 | 95 | 2022-02-11 01:09:14 | MASTER-Kislovodsk | (13h 53m 25.68s , +39d 46m 25.9s) | C | 20 | 15.6 | 105 | 2022-02-11 01:09:23 | MASTER-IAC | (13h 47m 38.91s , +40d 01m 15.3s) | P- | 20 | 16.6 | 105 | 2022-02-11 01:09:23 | MASTER-IAC | (13h 46m 31.14s , +40d 07m 59.6s) | P| | 20 | 16.9 | 135 | 2022-02-11 01:09:54 | MASTER-Kislovodsk | (13h 47m 30.69s , +40d 11m 15.9s) | C | 20 | 17.1 | 170 | 2022-02-11 01:09:54 | MASTER-Kislovodsk | (13h 47m 30.71s , +40d 11m 15.7s) | C | 90 | 18.0 | Coadd 135 | 2022-02-11 01:09:54 | MASTER-Kislovodsk | (13h 53m 25.53s , +39d 47m 27.9s) | C | 20 | 15.9 | 151 | 2022-02-11 01:10:04 | MASTER-IAC | (13h 46m 25.35s , +40d 06m 57.5s) | P| | 30 | 17.2 | 151 | 2022-02-11 01:10:04 | MASTER-IAC | (13h 47m 33.09s , +40d 00m 12.7s) | P- | 30 | 16.5 | 180 | 2022-02-11 01:10:34 | MASTER-Kislovodsk | (13h 47m 36.70s , +40d 10m 16.5s) | C | 30 | 17.4 | 180 | 2022-02-11 01:10:34 | MASTER-Kislovodsk | (13h 53m 31.51s , +39d 46m 30.2s) | C | 30 | 16.0 | 206 | 2022-02-11 01:10:54 | MASTER-IAC | (13h 46m 31.49s , +40d 07m 24.1s) | P| | 40 | 17.4 | 206 | 2022-02-11 01:10:54 | MASTER-IAC | (13h 47m 39.21s , +40d 00m 38.6s) | P- | 40 | 17.0 | 235 | 2022-02-11 01:11:24 | MASTER-Kislovodsk | (13h 47m 30.48s , +40d 09m 18.4s) | C | 40 | 17.4 | 235 | 2022-02-11 01:11:24 | MASTER-Kislovodsk | (13h 53m 25.29s , +39d 45m 33.1s) | C | 40 | 16.3 | 270 | 2022-02-11 01:11:54 | MASTER-IAC | (13h 46m 28.24s , +40d 08m 38.5s) | P| | 50 | 17.5 | 270 | 2022-02-11 01:11:54 | MASTER-IAC | (13h 47m 35.97s , +40d 01m 52.2s) | P- | 50 | 17.1 | 300 | 2022-02-11 01:12:24 | MASTER-Kislovodsk | (13h 47m 36.57s , +40d 09m 24.1s) | C | 50 | 16.9 | 300 | 2022-02-11 01:12:24 | MASTER-Kislovodsk | (13h 53m 31.46s , +39d 45m 39.3s) | C | 50 | 16.0 | 345 | 2022-02-11 01:13:04 | MASTER-IAC | (13h 46m 28.28s , +40d 06m 54.9s) | P| | 60 | 17.6 | 345 | 2022-02-11 01:13:04 | MASTER-IAC | (13h 47m 35.89s , +40d 00m 08.0s) | P- | 60 | 17.2 | 380 | 2022-02-11 01:13:34 | MASTER-Kislovodsk | (13h 47m 34.24s , +40d 10m 51.1s) | C | 70 | 17.7 | 380 | 2022-02-11 01:13:34 | MASTER-Kislovodsk | (13h 53m 29.36s , +39d 47m 07.7s) | C | 70 | 16.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 31582 table
GRB_name GRB220211A
GCN_number 31582
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 31582 SUBJECT: GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short) DATE: 22/02/12 00:11:28 GMT FROM: Aaron Tohuvavohu at U Toronto Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay (UAlabama), Jamie A. Kennea (PSU), report: Swift/BAT did not localize GRB 220211A onboard (T0: 2022-02-11T01:07:48 UTC, Fermi/GBM GCN 31570). The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu, arXiv:2111.01769), detects the burst with a sqrt(TS) of 11.3 in a 0.128 s analysis time bin. The duration of the burst is ~64 ms. NITRATES results are consistent with a burst coming from outside the coded FOV, with DeltaLLHOut of 3. An out of FOV origin is consistent with the Fermi/GBM localization (GCN 31570). See Section 9.1 and Figure 20 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
GCN 31584 table
GRB_name GRB220211A
GCN_number 31584
Detection_method IPN Triangulation
t_trigger 1:07:49 UTC
ra 208.3790°
decl 37.2180°
Circular_text TITLE: GCN CIRCULAR NUMBER: 31584 SUBJECT: IPN triangulation of GRB 220211A (short) DATE: 22/02/12 10:33:23 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report: The short-duration GRB 220211A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31570; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31582) has been detected by Fermi (GBM trigger 666234473), INTEGRAL (SPI-ACS), Konus-Wind, and Swift (BAT), so far, at about 4069 s UT (01:07:49). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 208.379 (13h 53m 31s) +37.218 (+37d 13' 05") Corners: 209.472 (13h 57m 53s) +52.187 (+52d 11' 14") 209.036 (13h 56m 09s) +51.894 (+51d 53' 39") 206.213 (13h 44m 51s) +22.653 (+22d 39' 12") 206.450 (13h 45m 48s) +22.322 (+22d 19' 18") --------------------------------------------- The error box area is 8 sq. deg, and its maximum dimension is 29.6 deg (the minimum one is 16.1 arcmin). The Sun distance was about 116 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi GBM Final Real-time position (GCN Circ. 31570) and BALROG (https://grb.mpe.mpg.de/grb/GRB220211047/) localizations. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220211_T04068/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.
GCN 31590 table
GRB_name GRB220211A
GCN_number 31590
Detection_method Optical
ra 203.6800°
decl 33.2168°
Circular_text TITLE: GCN CIRCULAR NUMBER: 31590 SUBJECT: ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient DATE: 22/02/14 18:47:06 GMT FROM: Igor Andreoni at JSI Igor Andreoni (JSI), Michael Coughlin (UMN), Tomas Ahumada (UMD), Mansi Kasliwal (Caltech), Daniel Perley (LJMU), Eric Burns (LSU), Mattia Bulla (OKC), Brad Cenko (NASA/GSFC), Shreya Anand (Caltech), Erik Kool (OKC) We report the discovery of the fast and red optical transient ZTF22aaajecp/AT2022cmc with the Zwicky Transient Facility (ZTF, Bellm et al. 2019, Graham et al. 2019) at coordinates: RA = 13:34:43.20 (203.6800149d) Dec = +33:13:00.44 (33.2167887d) ZTF22aaajecp was first detected on 2022-02-11 10:42 UT at r=20.73 +- 0.3 mag. The last ZTF upper limit before the first detection was measured on 2022-01-21 09:54 UT. ZTF22aaajecp increased its luminosity to r=19.04 +- 0.16 mag in 23.2 hours, then it faded by 0.8 mag in the following 48 hours. The latest detection of ZTF22aaajecp occurred on 2022-02-14 09:40 UT, r=19.84 +- 0.19 mag. The color of ZTF22aaajecp appears to be red, with g-r~0.25 mag and g-i~0.5 mag at the observed peak on 2022-02-12. The Galactic extinction on the line of sight is small, with E(B-V)=0.01 mag (Planck Collaboration et al., 2014). The source is located at a high Galactic latitude of b=78.85 deg. ZTF22aaajecp does not have any cataloged underlying source in deep Legacy Survey DR9 images. The fast evolution and red color suggest that ZTF22aaajecp could be a gamma-ray burst afterglow, but a spectroscopic confirmation is required to determine the nature of the transient. ZTF22aaajecp is spatially and temporally consistent with the Fermi-GBM short GRB 220211A (GBM trigger 666234473); however, it is located several degrees outside the IPN localization region for this event (Ridnaia et al. 2022; GCN 31584). Follow-up observations are strongly encouraged. ZTF22aaajecp was discovered by the ''ZTF Realtime Search and Triggering'' project (ZTFReST; Andreoni & Coughlin et al., 2021) within the ZTF Collaboration. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
GCN 31591 table
GRB_name GRB220211A
GCN_number 31591
Detection_method Fermi GBM Det
t_trigger 1:07:48.880 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 31591 SUBJECT: GRB 220211A: Fermi GBM observation DATE: 22/02/14 19:57:14 GMT FROM: Peter Veres at UAH P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team: "At 01:07:48.88 UT on 11 February 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220211A (trigger 666234473 / 220211047), which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. GCN 31852). The Fermi GBM Final Real-time Localization was reported in GCN 31570. The GBM light curve consists of a single short pulse with a duration (T90) of about 0.4 s (50-300 keV). The time-averaged spectrum from T0-64 ms to T0+128 ms is adequately fit by a simple power law function with index -1.42 +/- 0.07. The event fluence (10-1000 keV) in this time interval is (1.28 +/- 0.19)E-6 erg/cm^2. The 64 ms peak photon flux measured starting from T0-64 ms in the 10-1000 keV band is 12.8 +/- 2.7 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/"
GCN 31599 table
GRB_name GRB220211A
GCN_number 31599
Detection_method Konus-Wind Det
t_trigger 1:07:50.727 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 31599 SUBJECT: Konus-Wind detection of GRB 220211A DATE: 22/02/16 18:38:57 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, D. Frederiks, A.Lysenko, A. Ridnaia, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The short-duration GRB 220211A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31570; Veres and Meegan GCN Circ. 31591; Swift/BAT-GUANO detection: Tohuvavohu et al., GCN Circ. 31582; IPN triangulation: Ridnaia et al., GCN Circ. 31584) triggered Konus-Wind (KW) at T0=4070.727 s UT (01:07:50.727). The burst light curve shows a single pulse with the total duration of ~54 ms (20-1500 keV). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220211_T04070/ As observed by Konus-Wind, the burst had a fluence of 3.86(-0.53,+0.82)x10^-7 erg/cm^2 and a 16-ms peak energy flux, measured from T0-0.040 s, of 9.6(-2.1,+2.6)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). Since the main fraction of the burst emission was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modelling the time-integrated spectrum of the burst (measured from T0-0.050 s to T0+0.004 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = 0.77(-0.62,+1.32) and Ep = 413(-74,+88) keV. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN 31600 table
GRB_name GRB220211A
GCN_number 31600
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 31600 SUBJECT: GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc DATE: 22/02/16 22:39:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, A.Kuznetsov, P.Balanutsa, A.Chasovnikov, K.Zhirkov, O.Gress, N.Tiurina, G.Antipov, E.Gorbovskoy, D. Vlasenko, V.Senik, Ya.Kechin, V.Topolev (Lomonosov MSU,SAI,PhysicsDepartment), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), N.M. Budnev (Irkutsk State University, API), C.Francile, R. Podesta, F. Podesta (OAFA), L. Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J. Martinez, A.R.Corella, L.H.Rodriguez (INAOE, OAGH), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started inspect of Fermi short GRB 200211A (Ttrigger=2022-02-11 01:07:48UT, GCN 31570 https://gcn.gsfc.nasa.gov/other/220211A.gcn3) 33 sec after notice time (64 sec after trigger time) at 2022-02-11 01:08:53 UT and observed it at MASTER-IAC, -Tavrida, -Amur, -Kislovodsk, -SAAO, -OAGH, see cover map in Lipunov et al. GCN 31571 https://master.sai.msu.ru/site/master2/observ.php?id=1878703 ) ZTF (Andreoni et al. GCN31590) discovered new OT at R.A.,Dec.=13:34:43.20,+33:13:00.44 (ZTF22aaajecp/AT2022cmc) on 2022-02-11 10:42 UT We are analyzing 1864 MASTER database images of these coordinates since 2006y up to now. Preliminary results of OT detections (unfiltered,calibrated by Gaia) are the following: Date, m_OT 2022-02-13.03UT 19.4 2017-11-14.85UT 17.8 2014-03-27.68UT 19.0 The analysis will be continued. Additional observations are planned.
GCN 31606 table
GRB_name GRB220211A
GCN_number 31606
Detection_method Fermi GBM Other
redshift 0.5300
Circular_text TITLE: GCN CIRCULAR NUMBER: 31606 SUBJECT: GRB 220211A: redshift lower limit estimating DATE: 22/02/18 22:04:09 GMT FROM: Alexei Pozanenko at IKI, Moscow P. Minaev (IKI), A. Pozanenko (IKI) report on behalf of GRB IKI FuN: We analysed GRB 220211A (The Fermi GBM team, GCN 31570; Tohuvavohu et al., GCN 31582; Ridnaia et al., GCN 31584; Svinkin et al., GCN 31599) using publicly available data of GBM/Fermi. We estimate the duration in 7 - 850 keV energy band T_90 = 0.11 +/- 0.02 s. We performed spectral analysis in a time interval of (-0.05, 0.05) s, the best fit is obtained for CPL model with following parameters: E_p = 924 (-210, +317) keV, alpha = -0.50 +/- 0.25. The fluence of F = (5.8 +/- 0.5)E-7 erg/cm**2 is obtained in 10 - 1000 keV energy band. Using T_90,i - EH diagram [1,2] we classify the burst as type I (short) and find the minimal possible redshift value of z = 0.13 and the most probable value of the redshift z = 0.53. The T_90,i - EH diagram can be found in http://grb.rssi.ru/GRB220211A/GRB220211A_EHD.png The burst could also be classified as SGR Giant flare, placed at distance of D_L = 8.7 Mpc. [1] - Minaev et al., MNRAS, 492, 1919, 2020 [2] - Minaev et al., Astronomy Letters, 46, 9, 573, 2020
GCN 31626 table
GRB_name GRB220211A
GCN_number 31626
Detection_method IPN Triangulation
Circular_text TITLE: GCN CIRCULAR NUMBER: 31626 SUBJECT: ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient DATE: 22/02/21 21:16:30 GMT FROM: Alexander Kann at IAA-CSIC D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (Obs. Cote d'Azur), C. C. Thoene (HETH/ASU CAS Ondrejov), M. Blazek (HETH), J. F. Agui Fernandez (HETH/IAA-CSIC), I. Vico, and A. Guijarro (both CAHA) report: We observed the red ZTF transient ZTF22aaajecp/AT 2022cmc (Andreoni et al., GCN #31590), likely a GRB afterglow at z = 1.193 (Tanvir et al., GCN #31602; Lundquist et al., GCN #31612) with CAFOS, mounted on the 2.2m telescope, at the Calar Alto Observatory (Almeria, Spain). The observation started at 04:54:04 UT on 18 February 2022 (6.76 days after the first ZTF detection) and consisted of 12 x 120 s integrations in the r' and i' bands, each. Observations were hampered by the full Moon, but otherwise conditions were very good (1".3 seeing, very good transparency). The transient is clearly detected in each of the stacked images. Compared to a nearby Pan-STARRS comparison star, we measure r' = 21.12 +/- 0.03 mag (AB) 6.772 days after first detection. Gathering data from other GCNs (Andreoni et al., GCN #31590; Lipunov et al., GCN #31600; Kumar et al., GCN #31597; Pankov et al., GCNs #31593, #31625; Perley, GCN #31594), and assuming a GRB time one hour before the first detection (note the exact choice of time has little influence on the late decay slope), we find the transient is described by an achromatic decay with slope alpha = 1.05 +/- 0.05. The SED is described, similar to the result Perley (GCN #31594) found, by a simple power-law with slope beta = 1.29 +/- 0.22. This is slightly steeper than usual for synchrotron radiation from a typical GRB afterglow, indicating some extra extinction may play a role, as might be expected from the high X-ray column density found by NICER (Pasham et al., GCN #31601). Using the known redshift and the spectral slope, we shift the afterglow into the z = 1 frame (following Kann, Klose & Zeh 2006, ApJ, 641, 993). We find that at 6.2 days (z = 1 frame), this transient is among the ten most luminous GRB afterglows, yielding further evidence that it itself is a bona fide GRB afterglow. The long rise indicates an off-axis origin, and the luminous afterglow makes it likely the initial GRB was very energetic. So far no viable candidates have been reported by the IPN (it is not positionally coincident with the short GRB 220211A, Andreoni et al., GCN #31590; also we note a short GRB at such a high redshift would not be expected to have such a luminous afterglow), leading to the conclusion that the off-axis angle was large enough to strongly suppress the prompt emission - a true orphan afterglow.