GRB210218A

This page lists all entries on GRB210218A in GRBweb

Summary IPN Swift GCN 29529 GCN 29530 GCN 29531 GCN 29532 GCN 29537 GCN 29542 GCN 29556 GCN 29573

Summary table
Variable Value Source
T0 13:35:19 UTC GCN_circulars,Swift Det
ra 47.3180° Swift
decl 35.3220° Swift
pos_error 1.09e-02° Swift
T90 240.0 s Swift
T90_start 13:35:19 UTC Swift
fluence 4.30e-06 erg/cm² Swift
T100 240.0 s
GBM_located False
mjd 59263.56619212963 GCN_circulars,Swift Det
IPN table
GRB_name GRB210218A
ra 47.2917°
decl 35.2833°
pos_error 5.00e-02°
Swift table
GRB_name GRB210218A
t_trigger 13:35:19 UTC
ra 47.3180°
decl 35.3220°
pos_error 1.09e-02°
T90 240.0 s
fluence 4.30e-06 erg/cm²
GCN 29529 table
GRB_name GRB210218A
GCN_number 29529
Detection_method Swift Det
t_trigger 13:35:19 UTC
ra 47.2910°
decl 35.2870°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29529 SUBJECT: GRB 210218A: Swift detection of a burst DATE: 21/02/18 13:45:55 GMT FROM: Kim Page at U.of Leicester B. Sbarufatti (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team: At 13:35:19 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210218A (trigger=1033328). Swift did not slew immediately due to an observing constraint. The BAT on-board calculated location is RA, Dec 47.291, +35.287 which is RA(J2000) = 03h 09m 10s Dec(J2000) = +35d 17' 14" 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 ~800 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Moon observing constraint, Swift cannot slew to the BAT position until 11:37 UT on 2021 February 20. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is B. Sbarufatti (bxs60 AT psu.edu). 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 29530 table
GRB_name GRB210218A
GCN_number 29530
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29530 SUBJECT: GRB 210218A: NEXT optical upper limit DATE: 21/02/18 14:28:05 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 210218A (Sbarufatti et al., GCN 29529) using the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China. Observations automatically started at 13:36:52 UT on 2021-02-18, i.e., 93 s after the BAT trigger. We obtained 3x40 s, 4x60 s and 12x90 s frames in the Sloan r-filter. No credible optical transient is detected in our stacked image within the Swift/BAT error circle, down to a limiting magnitude of r ~ 20.4, calibrated with the nearby PanSTARRS field.
GCN 29531 table
GRB_name GRB210218A
GCN_number 29531
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29531 SUBJECT: GRB 210218A： GWAC-F60A optical upper limit DATE: 21/02/18 14:42:03 GMT FROM: Liping Xin at NAOC, SVOM L. P. Xin(NAOC), J. Wang(GXU), C. Gao(GXU), X. H. Han(NAOC), J. Y. Wei(NAOC), G. W. LI(NAOC), L. H. Li(NAOC), C. Wu(NAOC), X. G. Wang(GXU), E. W. Liang (GXU), R. S. Zhang(NAOC), Y. L. Qiu(NAOC), and J. S. Deng(NAOC) report: We began to observe GRB 210218A (Sbarufatti al., GCN 29529) with Xinglong GWAC-F60A telescope, China, at 11:37:45 (UT), 18th. Feb. 2021, about 146 sec after the burst, under bad seeing condition. A series of R, I images were obtained. Preliminary analysis shows that no any new optical source was found in single images within the Swift errorbox (Sbarufatti al., GCN 29529), down to the 3 sigma upper limit of 15.0 mag in R band. The upper limit is calibrated to the USNO B1.0 catalog. This result is consistent with the previous report (Zhu et al., GCN 29530).
GCN 29532 table
GRB_name GRB210218A
GCN_number 29532
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 29532 SUBJECT: GRB 210218A: MITSuME Akeno optical upper limits DATE: 21/02/18 15:33:22 GMT FROM: Ogawa Futa at Tokyo Institute of Technology F. Ogawa, R. Hosokawa, K. L. Murata, R. Adachi, M. Niwano, 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 210218A (Sbarufatti et al. GCN #29529, Zhu et al. GCN #29530, Xin et al. GCN #29531) 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 10 sec exposures started at 2021-02-18 13:36:05 UT(46 seconds after the Swift BAT trigger). We stacked the images with good conditions. We did not find any new point sources within the Swift BAT circle (Sbarufatti et al. GCN #29529) in all three bands. We obtained the 5-sigma limits of the stacked images as follows. T0+[sec] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 46 14:03:01 1220 g'>17.3, Rc>17.5, Ic>16.7 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used the UCAC4 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 29537 table
GRB_name GRB210218A
GCN_number 29537
Detection_method Swift-BAT Det
ra 47.3180°
decl 35.3220°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29537 SUBJECT: GRB 210218A: Swift-BAT refined analysis DATE: 21/02/19 02:01:49 GMT FROM: Amy Lien at GSFC M. Stamatikos (OSU), 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), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210218A (trigger #1033328) (Sbarufatti et al., GCN Circ. 29529). The BAT ground-calculated position is RA, Dec = 47.318, 35.322 deg which is RA(J2000) = 03h 09m 16.3s Dec(J2000) = +35d 19' 18.9" with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T-15 s and peaks at ~T0. The burst emission lasted until the burst went out of the BAT FOV at T+287 s. Using the available data, the lower limit of T90 is ~ 240 s. The time-averaged spectrum from T-14.27 to T+266.26 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.77 +- 0.49, and Epeak of 91.3 +- 48.2 keV (chi squared 50.53 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.3 +- 0.3 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.09 sec in the 15-150 keV band is 1.0 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.46 +- 0.11 (chi squared 57.43 for 57 d.o.f.). 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/1033328/BA/
GCN 29542 table
GRB_name GRB210218A
GCN_number 29542
Detection_method Swift-XRT Other
ra 47.3236°
decl 35.3240°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29542 SUBJECT: GRB 210218A: Swift-XRT observations DATE: 21/02/22 15:30:25 GMT FROM: Boris Sbarufatti at PSU J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto) and M. Stamatikos (OSU) report on behalf of the Swift-XRT team: We have analysed 2.7 ks of Photon Counting (PC) mode XRT data for the Swift-BAT-detected burst GRB 210218A (Stamatikos et al. GCN Circ. 29537), collected between T0+170 ks and T0+210 ks s. One uncatalogued X-ray source has been detected consistent with being within 296 arcsec of the Swift-BAT position, it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below: Source 3: RA (J2000): 47.3236 = 03:09:17.67 Dec (J2000): +35.3240 = +35:19:26.5 Error: 4.8 arcsec (radius, 90% conf.) Count-rate: (5.6 [+2.0, -1.6])e-3 ct s^-1 Distance: 164 arcsec from Swift-BAT position. Flux: (1.03 [+0.36, -0.29])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Two uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/01033328. This circular is an official product of the Swift-XRT team.
GCN 29556 table
GRB_name GRB210218A
GCN_number 29556
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 29556 SUBJECT: GRB 210218A: Swift/UVOT observations DATE: 21/02/23 14:49:18 GMT FROM: Alexander Belles at PSU/Swift A. Belles (PSU) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210218A approximately 170 ks after the BAT trigger (B. Sbarufatti et al., GCN 29529) due to a Moon constraint. No optical afterglow consistent with the XRT candidate position is detected (Osborne et al., GCN 29542). Preliminary 3-sigma upper limit using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first exposure is: Filter T_start(s) T_stop(s) Exp(s) Mag wh 170031 188263 1665 >21.65 The magnitude in the table is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.19 in the direction of the burst (Schlegel et al. 1998).
GCN 29573 table
GRB_name GRB210218A
GCN_number 29573
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29573 SUBJECT: GRB 210218A: Swift-XRT confirmation of afterglow DATE: 21/02/26 16:32:25 GMT FROM: Boris Sbarufatti at PSU B. Sbarufatti (PSU), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team Swift-XRT has performed follow up observations of GRB 210218A (Sbarufatti et al. GCN Circ. 29529). The Swift-BAT trigger happened while the burst position in the sky was Moon constrained for XRT and UVOT observations. A first follow up observation was performed when the target emerged from Moon constraint, with one uncatalogued X-ray source (source #3) detected inside the BAT error circle (Sbarufatti et al. GCN Circ. 29542). Swift-XRT observed the field again, for a further 4.7 ks, from T+497 ks to T+549 ks. Source #3 has faded below detection, with a 3-sigma upper limit of 2.5E-3 cts s^-1 (equivalent to 4.6E-14 erg cm^-2 s^-1 ), and is thus confirmed to be the burst afterglow. This circular is an official product of the Swift-XRT team.