GRB210222B

This page lists all entries on GRB210222B in GRBweb

Summary IPN Swift GCN 29545 GCN 29546 GCN 29547 GCN 29548 GCN 29549 GCN 29550 GCN 29551 GCN 29552 GCN 29554 GCN 29557 GCN 29558 GCN 29559 GCN 29560 GCN 29561 GCN 29562 GCN 29563 GCN 29565 GCN 29567 GCN 29569 GCN 31753

Summary table
Variable Value Source
T0 22:37:26 UTC GCN_circulars,Swift Det
ra 154.6060° Swift
decl -14.9320° Swift
pos_error 5.44e-05° Swift
T90 12.82 s Swift
T90_start 22:37:26 UTC Swift
fluence 3.40e-07 erg/cm² Swift
redshift 2.1980
T100 12.82 s
GBM_located False
mjd 59267.942662037036 GCN_circulars,Swift Det
IPN table
GRB_name GRB210222B
ra 154.6208°
decl -14.9000°
pos_error 5.00e-02°
redshift 2.1980
Swift table
GRB_name GRB210222B
t_trigger 22:37:26 UTC
ra 154.6060°
decl -14.9320°
pos_error 5.44e-05°
T90 12.82 s
fluence 3.40e-07 erg/cm²
redshift 2.1980
GCN 29545 table
GRB_name GRB210222B
GCN_number 29545
Detection_method Swift Det
t_trigger 22:37:26 UTC
ra 154.6210°
decl -14.8980°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29545 SUBJECT: GRB 210222B: Swift detection of a burst with an optical counterpart DATE: 21/02/22 23:02:05 GMT FROM: David Palmer at LANL J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), D. M. Palmer (LANL) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 22:37:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210222B (trigger=1034325). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 154.621, -14.898 which is RA(J2000) = 10h 18m 29s Dec(J2000) = -14d 53' 52" 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 20 sec. The peak count rate was ~1250 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 22:39:02.1 UT, 95.9 seconds after the BAT trigger. Using promptly downlinked data we find an X-ray source with an enhanced position: RA, Dec 154.6062, -14.9316 which is equivalent to: RA(J2000) = 10h 18m 25.50s Dec(J2000) = -14d 55' 53.7" with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 131 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 (8.87 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3 (+1.87/-1.66) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of nominal 150.000 seconds with the White filter starting 100 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at RA(J2000) = 10:18:25.45 = 154.60606 DEC(J2000) = -14:55:55.7 = -14.93215 with a 90%-confidence error radius of about 1.10 arc sec. This position is 2.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.65. No correction has been made for the expected extinction corresponding to E(B-V) of 0.101. This source lies within the current (Sector 35) field-of-view of TESS camera 1. We note that this source is 32 arcseconds from the known ROSAT All-Sky X-ray Survey source 1RXS J101827.6-145604. This is outside of the nominal joint error radius and so we believe that the ROSAT source is a coincidental alignment unrelated to the new GRB and its optical counterpart.
GCN 29546 table
GRB_name GRB210222B
GCN_number 29546
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29546 SUBJECT: GRB210222B: BOOTES-1 optical afterglow detection DATE: 21/02/22 23:16:50 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado M.D. Caballero-Garcia, M. A. Castro Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report: Following the Swift trigger of GRB 210222B (Gropp et al. GCNC 29545), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst. Images were taken starting at 22:40:53 UT (~3.5 min after trigger). In the first 10s image, the afterglow reported by UVOT (Gropp et al. GCNC 29545) is detected with magnitude of 15.6 +/- 0.15 (clear filter). Further observations are ongoing. We thank the staff at INTA-CEDEA for their excellent support.
GCN 29547 table
GRB_name GRB210222B
GCN_number 29547
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29547 SUBJECT: GRB210222B: LCO Optical Afterglow Detection DATE: 21/02/22 23:42:26 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration: We observed Swift GRB 210222B (Gropp et al., GCN 29545) with the LCO 1-m Sinistro instrument at the Sutherland, South Africa site, on February 22, from 22:53 to 23:06 UT (corresponding to 0.27 to 0.43 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 3x120s exposures in R and I. We clearly detect an optical source in R and I band in stacked images at a location consistent with the initial UVOT detection (Gropp at al., GCN 29444); this source is not present in either USNO or 2MASS catalogs. Using the USNO-B.1 catalog as reference, we calculate the following magnitudes: R = 16.95 +/- 0.01 I = 16.32 +/- 0.01 These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682
GCN 29548 table
GRB_name GRB210222B
GCN_number 29548
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29548 SUBJECT: GRB 210222B: GOTO confirmation of afterglow detection DATE: 21/02/23 00:25:43 GMT FROM: Travis Mong at Monash University Y-L Mong (1); K. Wiersema (2); K. Tse (1); K. Ackley (1); D. K. Galloway (1); M. Dyer (3); J. Lyman (2); K. Ulaczyk (2); D. Steeghs (2); V. Dhillon (3); P. O'Brien (4); G. Ramsay (5); S. Poshyachinda (6); R. Kotak (7); L. Nuttall (8); D. Pollacco (2); R. Breton (9) ((1) Monash University, (2) Warwick University, (3) University of Sheffield, (4) University of Leicester, (5) Armagh Observatory & Planetarium, (6) National Astronomical Research Institute of Thailand, (7) University of Turku, (8) University of Portsmouth, (9) University of Manchester) report on behalf of the GOTO collaboration: We carried out observations with the Gravitational-wave Optical Transient Observer (GOTO) on La Palma in response to GRB 210222B (Gropp et al; GCN 29545). We made a series of 4x90 s exposures using our wide L-band filter (400-700 nm) covering the Swift XRT error box, beginning around 54 s after the trigger, with midtime of the first observation 22:42:05.21 UT on 22 February 2021. We detect an uncatalogued source located at (J2000): RA 10:18:25.42 Dec +53:24:55.89 confirming the OT reported by MASTER (Lupinov et al.; GCN 29544), BOOTES-1 (Malesani et al.; GCN 29546) and LCO (Strausbaugh et al.; GCN 29547). We find an equivalent magnitude of g = (16.58 +/- 0.03) mag based on calibration against PanSTARRS DR1 photometry in ATLAS_REFCAT2 (Tonry et al. 2018). Observations are continuing. GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), Turku University, Portsmouth University, Manchester University and the Instituto de Astrofisica de Canarias (IAC) (https://goto-observatory.org)
GCN 29549 table
GRB_name GRB210222B
GCN_number 29549
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29549 SUBJECT: GRB 210222B: Liverpool Telescope optical detection DATE: 21/02/23 00:32:17 GMT FROM: Daniel Perley at Liverpool JMU D. A. Perley (LJMU) reports: A short ugriz imaging sequence of the optical afterglow of GRB 210222A (Gropp et al. 29545) was obtained using IO:O on the robotic Liverpool Telescope between 23:39 and 23:50 UT on 2021-02-22. Photometry relative to PS1 standards in the field gives the following magnitudes: t-t0 (d) magnitude 0.04333 : g = 18.67 +/- 0.04 0.04440 : r = 18.21 +/- 0.03 0.04544 : i = 18.01 +/- 0.03 0.04971 : z = 17.83 +/- 0.06 The g-band photometry lies below an extrapolation of the other bands and the source is not detected in u-band, which may suggest a moderately high redshift. DisclaimerNone
GCN 29550 table
GRB_name GRB210222B
GCN_number 29550
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 29550 SUBJECT: GRB 210222B: GOTO confirmation of afterglow detection (correction to GCN29548) DATE: 21/02/23 01:05:06 GMT FROM: Travis Mong at Monash University Y-L Mong (1); K. Wiersema (2); K. Tse (1); K. Ackley (1); D. K. Galloway (1); M. Dyer (3); J. Lyman (2); K. Ulaczyk (2); D. Steeghs (2); V. Dhillon (3); P. O'Brien (4); G. Ramsay (5); S. Poshyachinda (6); R. Kotak (7); L. Nuttall (8); D. Pollacco (2); R. Breton (9) ((1) Monash University, (2) Warwick University, (3) University of Sheffield, (4) University of Leicester, (5) Armagh Observatory & Planetarium, (6) National Astronomical Research Institute of Thailand, (7) University of Turku, (8) University of Portsmouth, (9) University of Manchester) report on behalf of the GOTO collaboration: The declination (Dec) of the afterglow candidate reported in GCN29548 is incorrect. The correct position of the detection is RA 10:18:25.42 Dec -14:55:54:63 We apologize for any confusion. GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), Turku University, Portsmouth University, Manchester University and the Instituto de Astrofisica de Canarias (IAC) ( https://goto-observatory.org)
GCN 29551 table
GRB_name GRB210222B
GCN_number 29551
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29551 SUBJECT: GRB 210222B: NEXT early optical afterglow observations DATE: 21/02/23 05:05:58 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu (NAOC, HUST), S.Y. Fu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report: We observed the field of GRB 210222B (Gropp et al., GCN 29545) using the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China. Observations automatically started at 22:39:01 UT on 2021-02-22, i.e., 95 s after the BAT trigger. We obtained a series of 40 s and 60 s frames during the local morning twilight in the Sloan r-filter. The previously reported optical afterglow (Gropp et al., GCN 29545; Hu et al., GCN 29546; Strausbaugh et al., GCN 29547; Mong et al., GCN 29548, 29550; Perley et al., GCN 29549) is detected in the stacked images of the first three exposures, with r = 14.5 +/- 0.3 mag, calibrated with nearby PS1 stars.
GCN 29552 table
GRB_name GRB210222B
GCN_number 29552
Detection_method Other
redshift 2.1980
Circular_text TITLE: GCN CIRCULAR NUMBER: 29552 SUBJECT: GRB 210222B: Redshift from FORS2/VLT DATE: 21/02/23 08:49:55 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC J. F. Agui Fernandez (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), L. Izzo (DARK/NBI), D. Xu (NAOC), D.A. Kann (HETH/IAA-CSIC), D.B. Malesani (DTU Space), J.P.U. Fynbo (DAWN/NBI), K. Wiersema (Warwick U.) report: We observed the afterglow of GRB 210222B (Gropp et al. GCN 29545; Hu et al. GCN 29546; Strausbaugh et al. GCN 29547; Mong et al. GCN 29548 and GCN 29550; Perley GCN 29549; Zhu et al. GCN 29551) with FORS2, mounted at the Unit Telescope 1 of the Very Large Telescope, at Paranal Observatory, Chile. The observation started at 3:00 UT (4.376 hr after the burst) and consisted of 2x700 s exposures using grism 300V and 2x700 s exposures using grism 300I, which together cover the full range between 3300 and 10100 AA. In the acquisition image, the afterglow is well detected at V = 19.6 +/- 0.1 mag (Vega). The spectrum shows continuum over the full range with strong absorption features that we identify as due to Lyman alpha, SII, SiII, SiII*, OI, CII, SiIV, CIV, FeII, AlII and MgII at a common redshift of 2.198, which we identify as the redshift of the GRB. This is consistent with the moderately high redshift already reported by Perley (GCN 29549) based on the photometric decline in the u-band. We acknowledge excellent support from the ESO staff, in particular Jose Velasquez, Chiara Mazzucchelli, and Jonathan Smoker.
GCN 29554 table
GRB_name GRB210222B
GCN_number 29554
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29554 SUBJECT: GRB 210222B: MASTER OT observation DATE: 21/02/23 11:10:04 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy,N.Tiurina,P.Balanutsa,F.Balakin, V.Vladimirov, A.Kuznetsov,K.Zhirkov,D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, A.Chasovnikov,A.Pozdnyakov,V.Topolev, D.Cheryasov(Lomonosov Moscow State University, SAI, Physics Department), D. Buckley (South African Astronomical Observatory), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), O.A. Gres, N.M. Budnev (Irkutsk State University, API), 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) automatically started (Lipunov et al. GCN 29544) Swift GRB 200222B (J.Gropp et al. GCN 29545,Ttrigger=22:37:26 UT) optical observations at MASTER-Kislovodsk at 2021-02-22 22:38:07UT (41s after trigger time in clouds), at MASTER-SAAO at 2021-02-22 22:42:03UT (GCN 29544). MASTER auto-detection system found MASTER OT J101825.41-145554.9, also detected by Swift (GCN 29545), and observed by BOOTES-1 (GCN 29546), LCO (29547), GOTO(29548), Liverpool Telescope (GCN 29549), NEXT (29551),VLT (GCN 29551) This OT was also observed by MASTER-IAC. The reduction of MASTER wide field and very wide field cameras images will be continued. This message may be cited.
GCN 29557 table
GRB_name GRB210222B
GCN_number 29557
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29557 SUBJECT: GRB 210222B: FRAM-ORM afterglow detection DATE: 21/02/23 15:53:50 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ) report: The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the alert of GRB210222B (Gropp et al. GCNC 29545, Marrocchesi et al. GCNC 29553), obtaining a series of 20 s unfiltered images starting at 22:38:21.1 UT, i.e. 55.1s post trigger. We clearly detect the source reported by other telescopes (Hu et al. GCNC 29546, Strausbaugh et al. GCNC 29547, Mong et al. GCNC 29548, Perley GCNC 29549, Agui Fernandez et al. GCNC 29552, and Lipunov et al. GCNC 29554). As seen by FRAM, the brightness of the object reached a maximum of about R(Vega) ~ 15.5, similarly to the value of BOOTES, and then slowly changed to a decay with an index alpha = ~1.1. Would the decay stay at this rate, the afterglow may have a brightness of R~22.0 24h post trigger.
GCN 29558 table
GRB_name GRB210222B
GCN_number 29558
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29558 SUBJECT: GRB 210222B: KAIT Optical Upper Limit DATE: 21/02/23 16:48:01 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 210222B (Gropp et al., GCN 29545) starting at ~0.44 days after the burst. A total of 30x60s images were obtained in the clear (roughly R) filters. We do not detect the optical afterglow (Gropp et al., GCN 29545; Hu et al., GCNC 29546; Strausbaugh et al., GCNC 29547; Mong et al., GCNC 29548; Perley, GCNC 29549; Agui Fernandez et al., GCNC 29552; Lipunov et al., GCNC 29554; Jelinek et al., GCN 29557) in the co-add images, down to a limiting magnitude of ~20.0 mag calibrated to the USNOB1.0 catalog.
GCN 29559 table
GRB_name GRB210222B
GCN_number 29559
Detection_method Swift-UVOT Det
ra 154.6060°
decl -14.9320°
redshift 2.1980
Circular_text TITLE: GCN CIRCULAR NUMBER: 29559 SUBJECT: GRB 210222B: Swift/UVOT Detection DATE: 21/02/23 18:57:39 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210222B 101 s after the BAT trigger (Gropp et al., GCN Circ. 29545). A source consistent with the XRT position (Gropp et al. GCN Circ. 29545) is detected in the initial UVOT exposures. This source is also consistent with previously reported optical detections (Hu et al., GCN Circ. 29546; Strausbaugh, GCN Circ. 29547; Mong et al., GCN Circ. 29548; Parley, GCN Circ. 29549; Zhu et al., GCN Circ. 29551, Lipunov et al., GCN Circ. 29554). We note that the lack of detection in the NUV passbands would be consistent with the redshift of 2.198 reported by Agui Fernandez et al. (GCN Circ. 29552). The preliminary UVOT position is: RA (J2000) = 10:18:25.43 = 154.60595 (deg.) Dec (J2000) = -14:55:55.1 = -14.93198 (deg.) with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 101 250 147 16.89 +/- 0.03 v 588 608 19 16.80 +/- 0.17 b 515 534 20 17.24 +/- 0.12 u 259 508 246 16.82 +/- 0.04 w1 639 1793 124 >18.8 m2 614 1606 78 >20.1 w2 564 1732 136 >19.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.102 in the direction of the burst (Schlegel et al. 1998).
GCN 29560 table
GRB_name GRB210222B
GCN_number 29560
Detection_method Swift-XRT Other
ra 154.6057°
decl -14.9317°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29560 SUBJECT: GRB 210222B: Swift-XRT refined Analysis DATE: 21/02/23 19:23:17 GMT FROM: Phil Evans at U of Leicester K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), P.A. Evans (U. Leicester) and J.D. Gropp report on behalf of the Swift-XRT team: We have analysed 6.2 ks of XRT data for the Swift-BAT-detected burst GRB 210222B (Gropp et al. GCN Circ. 29545), from 111 s to 63.2 ks after the Swift-BAT trigger. The data are entirely in Photon Counting (PC) mode. Using 2754 s of PC mode data and 4 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 154.60574, -14.93170 which is equivalent to: RA (J2000): 10h 18m 25.38s Dec(J2000): -14d 55' 54.1" with an uncertainty of 1.4 arcsec (radius, 90% confidence). This position is 2.2 arcmin from the Swift-BAT position. The light curve can be modelled with an initial power-law decay with an index of alpha=0.19 (+/-0.16), followed by a break at T+827 s to an alpha of 1.30 (+0.12, -0.08). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.98 (+0.15, -0.14). The best-fitting absorption column is 1.4 (+0.5, -0.4) x 10^21 cm^-2, in excess of the Galactic value of 8.9 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 3.5 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.4 (+0.5, -0.4) x 10^21 cm^-2 Galactic foreground: 8.9 x 10^20 cm^-2 Excess significance: 1.9 sigma Photon index: 1.98 (+0.15, -0.14) If the light curve continues to decay with a power-law decay index of 1.30, the count rate at T+24 hours will be 3.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-13 (1.4 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/01034325. This circular is an official product of the Swift-XRT team.
GCN 29561 table
GRB_name GRB210222B
GCN_number 29561
Detection_method Swift-BAT Det
ra 154.6310°
decl -14.9460°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29561 SUBJECT: GRB 210222B: Swift-BAT refined analysis DATE: 21/02/23 22:42:22 GMT FROM: Sibasish Laha at GSFC T. N. Ukwatta (LANL), 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), B. Sbarufatti (PSU) M. Stamatikos (OSU), (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 210222B (trigger #1034325) (Gropp et al., GCN Circ. 29545). The BAT ground-calculated position is RA, Dec = 154.631, -14.946 deg which is RA(J2000) = 10h 18m 31.4s Dec(J2000) = -14d 56' 45.7" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 38%. The BAT light curve showed a two peaked structure with a duration of about ~20 sec. T90 (15-350 keV) is 12.82 +- 1.28 sec (estimated error including systematics). The time-averaged spectrum from T-11.37 to T+2.72 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.37 +- 0.33. The fluence in the 15-150 keV band is 3.4 +- 0.7 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.87 sec in the 15-150 keV band is 1.4 +- 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/1034325/BA/
GCN 29562 table
GRB_name GRB210222B
GCN_number 29562
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29562 SUBJECT: GRB 210222B: VIRT optical detection DATE: 21/02/24 04:10:56 GMT FROM: Priyadarshini Gokuldass at U. of the Virgin Islands P. Gokuldass (UVI), N. Orange (OrangeWave Innovative Science, LLC), R. Strausbaugh (UVI), A. Cucchiara (UVI/College of Marin), D. Morris (UVI) report: We observed the field of GRB210222B (Gropp et al, GCN 29545) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 02-23-2021 starting at 02:14:31 UT (T+3.6hrs). We performed a series of exposures in R filter with a total exposure of 4600 s. The weather conditions were clear during the hours of observation with an average air masses as shown in the table below. We detect the optical transient reported by others (Gropp et al., GCN 29545, Hu et al., GCN 29546,Strausbaugh et al., GCN 29547, Mong et al., GCN 29548, Perley, GCN 29549, Aqui Fernandez et al., GCN 29552, Lipunov et al., GCN 29554, Jelinik et al., GCN 29557) at > 3-sigma confidence with magnitudes as reported below: T_mid ||Exposure ||Filter ||Limit ||Airmass T+4.5 hrs ||2000s ||R ||18.5 +/- 0.1 ||1.7 T+8.5 hrs ||2600s ||R ||20.0 +/- 0.2 ||1.5 The magnitude is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. Further analysis is in progress. The VIRT is still in the commissioning phase. This work is supported by NASA-MUREP-MIRO grant NNX15AP95A, NSF EiR AST Award 1901296, and NSF HBCU-UP AST Award 1831682. This message can be cited.
GCN 29563 table
GRB_name GRB210222B
GCN_number 29563
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29563 SUBJECT: GRB 210222B: Zeiss-1000 of Koshka observatory, optical observations DATE: 21/02/24 11:08:10 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), A. Novichonok (Petrozavodsk State University, KIAM), A. Zhornichenko (KIAM), N. Pankov (HSE) report on behalf of IKI GRB FuN: We observed the field of GRB 210222B (Gropp et al., GCN 29545) with Zeiss-1000 telescope of Koshka observatory starting on Feb. 22 (UT) 22:46:13, i.e. about 12.8 minutes after GRB trigger. We clearly detect optical afterglow (Gropp et al., GCN 29545; Hu et al., GCN 29546; Strausbaugh et al., GCN 29547; Mong et al., GCNs 29548, 29550; Perley et al., GCN 29549; Zhu et al., GCN 29551; Lipunov et al., GCN 29554; Jelinek et al., GCN 29557; Zheng et al., GCN 29558; Siegel et al., GCN 29559; Gokuldass et al., GCN 29562). Observations were performed under non-optimal weather conditions. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2020-12-03 20:50:46 0.58216 R 120*25 n/d n/d 20.5 Date, UT start Exptime,s t-T0,d Filter OT Err UL(3sigma) 2021-02-22 22:46:13 240 0,00748842 R 16.27 0.09 18.3 2021-02-22 22:50:18 240 0,01032407 R 16.49 0.11 18.2 2021-02-22 22:55:50 240 0,01416666 R 16.71 0.11 18.2 2021-02-22 22:59:54 5*240 0,02254629 R 17.18 0.18 18.7 2021-02-22 23:20:18 7*240 0,03949074 R 17.60 0.15 18.9 The photometry is based on the nearby USNO-B1.0 stars USNO-B1.0_id R2 0750-0233028 14.52 0750-0233056 15.22 0750-0233031 15.24 The light curve can be found in http://grb.rssi.ru/GRB210222B/GRB210222B_LC.png Based only on our photometry we estimated power law index of the afterglow light curve of -0.74. We are grateful to the “Terskol Observatory” Center of the Institute of Astronomy of the Russian Academy of Sciences (INASAN) for the observations with the Zeiss-1000 telescope on Mount Koshka at the Simeiz Observatory.
GCN 29565 table
GRB_name GRB210222B
GCN_number 29565
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 29565 SUBJECT: GRB 210222B: MITSuME Akeno optical upper limits DATE: 21/02/25 08:30:41 GMT FROM: Ryohei Hosokawa at Tokyo Institute of Technology R. Hosokawa, K. L. Murata, R. Adachi, M. Niwano, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration: We observed the field of GRB 210222B (Lipunov et al. GCN #29544, Gropp et al. GCN #29545, Hu et al. GCN #29546, Strausbaugh et al. GCN #29547, Mong et al. GCN #29548, Perley et al. GCN #29549, Mong et al. GCN #29550, Zhu et al. GCN #29551, Fernandez et al. GCN #29552, Lipunov et al. GCN #29554, Jelinek et al. GCN #29557, Zheng et al. GCN #29558, Siegel et al. GCN #29559, Page et al. GCN #29560, Ukwatta et al. GCN #29561, Gokuldass et al. GCN #29562, Belkin et al. GCN #29563) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation with a series of 60 sec exposures started at 2021-02-23 11:00:13 UT(12.4hours after the Swift BAT trigger). We stacked the images with good conditions. We did not detect the optical afterglow reported previously (Gropp et al. GCN #29545, Hu et al. GCN #29546, Strausbaugh et al. GCN #29547, Mong et al. GCN #29548, Perley et al. GCN #29549, Mong et al. GCN #29550, Zhu et al. GCN #29551, Fernandez et al. GCN #29552, Lipunov et al. GCN #29554, Jelinek et al. GCN #29557, Siegel et al. GCN #29559, Gokuldass et al. GCN #29562, Belkin et al. GCN #29563) in all three bands. We obtained the 5-sigma limits of the stacked images as follows. T0+[hour] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 12.4 15:18:25 14100 g'>19.6, Rc>19.9, Ic>19.2 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN 29567 table
GRB_name GRB210222B
GCN_number 29567
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29567 SUBJECT: GRB 210222B: REM observations of the optical/NIR afterglow DATE: 21/02/25 21:29:46 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, S. Covino, D. Fugazza, A. Melandri (INAF-OAB) on behalf of the REM team, report: We observed the field of GRB 210222B (Gropp et al., GCN Circ. 29545) with the REM 60cm robotic telescope located at the ESO premise of La Silla (Chile). The observations were performed starting on 2021 February 23 at 00:18:20 UT (i.e. 1.68 hours after the burst) and were carried in the g, r, i, z, J and H bands. The optical afterglow (Gropp et al., GCN Circ. 29545) is detected in all bands. From preliminary photometry we obtain for the optical/NIR afterglow the following magnitudes: r = 18.85 +/- 0.13 (AB; calibrated against the Pan-STARRS catalogue) H = 16.39 +/- 0.20 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 = 1.93 hours.
GCN 29569 table
GRB_name GRB210222B
GCN_number 29569
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 29569 SUBJECT: GRB 210222B: 1.3m DFOT Optical upper limit DATE: 21/02/26 06:14:15 GMT FROM: Rahul Gupta at ARIES, India Rahul Gupta, A. Kumar, Dimple, A. Ghosh, A. Aryan, V. Negi, B. Kumar, S. B. Pandey, and K. Misra (ARIES) report: We observed the field of Swift detected GRB 210222B (Gropp et al., GCN 29545) with 1.3m Devasthal Fast Optical Telescope (DFOT) located at Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2021-02-23 at ~ 19:15 UT, i.e., ~ 20.6 hours after the BAT trigger. We have taken multiple frames having an exposure time of 120 s in the R and I filters. We stacked the images after the alignment. We did not detect the optical afterglow reported previously (Gropp et al. GCN 29545; Hu et al. GCN 29546; Strausbaugh et al. GCN 29547; Mong et al. GCN 29548, 29550; Perley et al. GCN 29549; Zhu et al. GCN 29551, Fernandez et al. GCN 29552; Lipunov et al. GCN 29554; Jelinek et al. GCN 29557; Siegel et al. GCN 29559; Gokuldass et al. GCN 29562; Belkin et al. GCN 29563; and D'Avanzo et al. GCN 29567) in our stacked image. We obtain the following 3-sigma upper limit in the stacked image. Date Start_UT T_start-T0 (hour) Filter Exp time (s) Limiting magnitude ==================================================== 2021-02-23 19:15 ~20.6 R 120*30 > 21.1 The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalog. This circular may be cited.
GCN 31753 table
GRB_name GRB210222B
GCN_number 31753
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 31753 SUBJECT: GRB 210222B: TAROT Reunion observatory optical light curve DATE: 22/03/13 22:11:11 GMT FROM: Alain Klotz at IRAP-CNRS-OMP A. Klotz (CNRS-OMP-IRAP), M. Fortune, R. Augerai (Universite de la Renuion), P. Thierry (AGORA), L. Eymar, S. Antier, M. Boer, A. de Ugarte Postigo (CNRS-OCA-ARTEMIS), We analyzed archive images of the SWIFT trigger 1034325 (GRB 210222B, BAT detection by Gropp et al. GCN Circ. 29545, early optical ground observations by Fernandez-Garcia et al. GCN Circ. 29546, redshift by Agui Fernandez et al. GCN Circ. 29552) with the TAROT robotic telescope (D=18cm) located at Les Makes Observatory, Reunion Island, France. Images were acquired without any filter, camera FLI PL16803 and Takahashi Epsilon 180ED. According the reference star NOMAD-1 0750-0237314 R=15.43 we give the photometry of the GRB optical transient: t1(s) t2(s) R dmag 342 433 15.76 0.06 439 529 16.08 0.07 536 626 16.14 0.08 658 748 16.28 0.09 755 845 16.38 0.09 853 942 16.38 0.09 1526 1706 16.98 0.12 1714 1894 17.28 0.15 1902 2543 17.32 0.13 2550 3317 17.74 0.21 3347 4843 17.92 0.25 4852 6755 18.52 0.47 t1 and t2 are start and stop acquisition since the trigger. Magnitudes are not corrected for Galactic dust extinction.