GRB210226A

This page lists all entries on GRB210226A in GRBweb

Summary Fermi GBM IPN Swift GCN 29568 GCN 29570 GCN 29571 GCN 29572 GCN 29574 GCN 29575 GCN 29576 GCN 29578 GCN 29579 GCN 29590 GCN 29656

Summary table
Variable Value Source
GRB_name_Fermi GRB210226197
T0 4:43:48.499 UTC Fermi_GBM
ra 124.1153° Swift
decl 57.5839° Swift
pos_error 1.94e-04° Swift
T90 25.536 s Fermi_GBM
T90_error 4.404 s Fermi_GBM
T90_start 4:43:48.499 UTC Fermi_GBM
fluence 2.37e-06 erg/cm² Fermi_GBM
fluence_error 6.58e-08 erg/cm² Fermi_GBM
T100 25.536 s
GBM_located False
mjd 59271.1970891088 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB210226197
trigger_name bn210226197
ra 124.1142°
decl 57.5839°
datum 2021-02-26
t_trigger 4:43:56.563 UTC
T90 25.536 s
T90_error 4.404 s
T90_start 4:43:48.499 UTC
fluence 2.37e-06 erg/cm²
fluence_error 6.58e-08 erg/cm²
flux_1024 4.07e+00 erg/cm²/s
flux_1024_error 2.05e-01 erg/cm²/s
flux_1024_time 1.15e+00 erg/cm²/s
flux_64 6.36e+00 erg/cm²/s
flux_64_error 9.64e-01 erg/cm²/s
IPN table
GRB_name GRB210226A
ra 124.1375°
decl 57.5833°
pos_error 5.00e-02°
Swift table
GRB_name GRB210226A
t_trigger 4:43:57 UTC
ra 124.1153°
decl 57.5839°
pos_error 1.94e-04°
GCN 29568 table
GRB_name GRB210226A
GCN_number 29568
Detection_method Swift Det
t_trigger 4:43:57 UTC
ra 124.1380°
decl 57.5770°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29568 SUBJECT: GRB 210226A: Swift detection of a burst DATE: 21/02/26 05:11:11 GMT FROM: David Palmer at LANL A. P. Beardmore (U Leicester), N. J. Klingler (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 04:43:57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210226A (trigger=1034721). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 124.138, +57.577 which is RA(J2000) = 08h 16m 33s Dec(J2000) = +57d 34' 38" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~3400 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 04:45:35.3 UT, 98.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 124.1144, 57.5839 which is equivalent to: RA(J2000) = 08h 16m 27.46s Dec(J2000) = +57d 35' 02.2" with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 51 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (5.24 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.2 (+1.84/-1.67) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 101 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.048. Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN 29570 table
GRB_name GRB210226A
GCN_number 29570
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29570 SUBJECT: GRB 210226A: Ondrejov BART/SBT optical limit DATE: 21/02/26 08:05:59 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov Martin Jelinek, Jan Strobl, Rene Hudec and Cyril Polasek (ASU CAS Ondrejov, CZ), report: The 0.2 m Small Binocular Telescope (BART/SBT) of Ondrejov observatory in Czech republic reacted robotically to the alert of GRB 210226A (Beardmore et al, GCNC 29568), obtaining a series of 12 s unfiltered images starting at 04:54:55.8 UT, i.e. 659 s post trigger. We do not detect any new source within the XRT errorbox neither in single images (3-sigma limit r'(AB) > ~14.0) nor in a combined 30 x 12 s frame (mean exp time 1033 s post trigger, 3-sigma limit r'(AB) > ~15.8) as calibrated against the Atlas catalog (Tonry et al. ApJ 867, 105, 2018).
GCN 29571 table
GRB_name GRB210226A
GCN_number 29571
Detection_method Swift-XRT Det
ra 124.1153°
decl 57.5839°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29571 SUBJECT: GRB 210226A: Enhanced Swift-XRT position DATE: 21/02/26 12:08:48 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1421 s of XRT Photon Counting mode data and 3 UVOT images for GRB 210226A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 124.11528, +57.58394 which is equivalent to: RA (J2000): 08h 16m 27.67s Dec (J2000): +57d 35' 02.2" with an uncertainty of 1.5 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 29572 table
GRB_name GRB210226A
GCN_number 29572
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29572 SUBJECT: GRB 210226A: Burke-Gaffney Observatory optical upper limit DATE: 21/02/26 15:11:19 GMT FROM: Filipp Dmitrievich Romanov at Amateur astronomer I observed the field of GRB 210226A (Beardmore et al., GCN Circ. 29568) with remote telescope (0.61-m f/6.5 Corrected Dall-Kirkham + CCD) of Burke-Gaffney Observatory (Halifax, Canada). Image (clear: without filter) with 180 seconds exposure time was obtained on 2021-02-26. Start time of exposure: 08:00:36 UT (3 h. 16 m. 39 s. after trigger). I did not detect any optical transients (magnitude limit of about 18.0). Image available here: http://www.ap.smu.ca/~bgo/sm/id.php?app=0&id=13614
GCN 29574 table
GRB_name GRB210226A
GCN_number 29574
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29574 SUBJECT: Swift GRB 210226A: Global MASTER-Net observations report DATE: 21/02/26 16:46:58 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, 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, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 210226A ( A. P. Beardmore et al., GCN 29568) errorbox 42015 sec after notice time and 42682 sec after trigger time at 2021-02-26 16:35:20 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 30 deg. The sun altitude is -13.1 deg. The galactic latitude b = 34 deg., longitude l = 160 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1556267 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 42773 | MASTER-Tavrida | C | 180 | 17.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 29575 table
GRB_name GRB210226A
GCN_number 29575
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29575 SUBJECT: GRB 210226A: Swift-XRT refined Analysis DATE: 21/02/26 18:18:27 GMT FROM: Phil Evans at U of Leicester M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and A.P. Beardmore report on behalf of the Swift-XRT team: We have analysed 6.2 ks of XRT data for GRB 210226A (Beardmore et al. GCN Circ. 29568), from 101 s to 39.3 ks after the BAT trigger. The data comprise 12 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 29571). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.0 (+0.3, -0.4). At T+423 s the decay flattens to an alpha of -0.3 (+0.4, -1.1) before breaking again at T+1011 s to a final decay with index alpha=1.14 (+0.09, -0.08). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.96 (+0.18, -0.17). The best-fitting absorption column is 1.9 (+/-0.6) x 10^21 cm^-2, in excess of the Galactic value of 5.2 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.9 (+/-0.6) x 10^21 cm^-2 Galactic foreground: 5.2 x 10^20 cm^-2 Excess significance: 4.0 sigma Photon index: 1.96 (+0.18, -0.17) If the light curve continues to decay with a power-law decay index of 1.14, the count rate at T+24 hours will be 4.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.6 x 10^-13 (2.1 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01034721. This circular is an official product of the Swift-XRT team.
GCN 29576 table
GRB_name GRB210226A
GCN_number 29576
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29576 SUBJECT: GRB 210226A: KAIT Optical Upper Limit DATE: 21/02/26 18:29:47 GMT FROM: Weikang Zheng at UC Berkeley WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 210226A (Beardmore et al., GCN 29568) starting at 04:56:15 UT, 738s after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20s per image. We do not detect any optical afterglow candidate within the enhanced XRT position error circle (Goad et al., GCN 29571), neither in single image, nor in the co-add images. The typical limiting magnitude of our single clear image is about 19.0 mag calibrated to the USNOB1.0 catalog. Our result is consistent with the optical upper limit reported by other groups (Jelinek et al., GCN 29570; Romanov, GCN 29572; Lipunov et al., GCN 29574).
GCN 29578 table
GRB_name GRB210226A
GCN_number 29578
Detection_method Fermi GBM Det
t_trigger 4:43:56.560 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 29578 SUBJECT: GRB 210226A: Fermi GBM detection DATE: 21/02/27 03:20:46 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 04:43:56.56 UT on 26 February 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210226A (trigger 636007441 / 210226197) which was also detected by the Swift/BAT and Swift/XRT (A.P. Beardmore et al. 2019, GCN 29568). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 58.6 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 26 s (50-300 keV). The time-averaged spectrum from T0-6 s to T0+18 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.2 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 170 +/- 29 keV The event fluence (10-1000 keV) in this time interval is (2.7 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.2 s in the 10-1000 keV band is 4.1 +/- 0.2 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 29579 table
GRB_name GRB210226A
GCN_number 29579
Detection_method Swift-BAT Det
ra 124.1530°
decl 57.5850°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29579 SUBJECT: GRB 210226A: Swift-BAT refined analysis DATE: 21/02/27 04:04:47 GMT FROM: Sibasish Laha at GSFC S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210226A (trigger #1034721) (Beardmore, et al., GCN Circ. 29568). The BAT ground-calculated position is RA, Dec = 124.153, 57.585 deg which is RA(J2000) = 08h 16m 36.7s Dec(J2000) = +57d 35' 06.9" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%. The BAT light curve showed a complex structure with a duration of about ~30 sec. T90 (15-350 keV) is 20.80 +- 1.68 sec (estimated error including systematics). The time-averaged spectrum from T-1.92 to T+20.95 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.44 +- 0.15. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+0.02 sec in the 15-150 keV band is 2.8 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1034721/BA/
GCN 29590 table
GRB_name GRB210226A
GCN_number 29590
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29590 SUBJECT: GRB 210226A: Swift/UVOT Upper Limits DATE: 21/02/28 23:29:56 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210226A 102 s after the BAT trigger (Beardmore et al., GCN Circ. 29568). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 29568) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 102 251 147 >20.9 u_FC 314 563 246 >20.4 white 102 1192 353 >21.4 v 643 1236 72 >19.1 b 569 1167 58 >19.9 u 314 5121 463 >20.5 w1 692 4935 236 >20.4 m2 4530 4730 197 >20.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.049 in the direction of the burst (Schlegel et al. 1998).
GCN 29656 table
GRB_name GRB210226A
GCN_number 29656
Detection_method Optical
ra 124.1153°
decl 57.5839°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29656 SUBJECT: GRB 210226A: GIT optical upper limit DATE: 21/03/15 11:33:03 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar(IITB), K. Sharma (IITB), U. Stanzin (IAO), A. Dutta(IIA), V. Bhalerao(IITB), G. C. Anupama(IIA), S. Barway(IIA) report on behalf of the GIT team: We observed GRB 210226A detected by Swift-BAT (A. P. Beardmore et al., GCN 29568) with 0.7m GROWTH-India Telescope (GIT). We obtained 10 exposures of 300 sec each in the r' filter. We did not detect any new source in our stacked image within the 1.5 arcsec circle around R.A.= 08h 16m 27.67s, DEC.=+57d 35' 02.2". The obtained upper limit follows as: ------------------------------------------------------------------- JD (mid) | T_mid-T0(hrs) | Exposure (sec) | Filter | Lim_mag (5-sigma) | ------------------------------------------------------------------- 2459272.1074 | 9.84 | 3000 (stacked) | r' | > 20.34 | ------------------------------------------------------------------- The magnitudes are calibrated against PanSTARRS (Flewelling et al., 2018) and not corrected for galactic extinction. The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).