GRB210411C

This page lists all entries on GRB210411C in GRBweb

Summary IPN Swift GCN 29794 GCN 29800 GCN 29802 GCN 29803 GCN 29804 GCN 29806 GCN 29807 GCN 29808 GCN 29809 GCN 29810 GCN 29811 GCN 29823

Summary table
Variable Value Source
T0 15:05:51 UTC GCN_circulars,Swift Det
ra 296.6117° Swift
decl -39.3978° Swift
pos_error 5.57e-05° Swift
T90 12.8 s Swift
T90_start 15:05:51 UTC Swift
fluence 1.20e-06 erg/cm² Swift
redshift 2.8260
T100 12.8 s
GBM_located False
mjd 59315.6290625 GCN_circulars,Swift Det
IPN table
GRB_name GRB210411C
ra 296.5583°
decl -39.3667°
pos_error 5.00e-02°
redshift 2.8260
Swift table
GRB_name GRB210411C
t_trigger 15:05:51 UTC
ra 296.6117°
decl -39.3978°
pos_error 5.57e-05°
T90 12.8 s
fluence 1.20e-06 erg/cm²
redshift 2.8260
GCN 29794 table
GRB_name GRB210411C
GCN_number 29794
Detection_method Swift Det
t_trigger 15:05:51 UTC
ra 296.5590°
decl -39.3730°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29794 SUBJECT: GRB 210411C: Swift detection of a burst with an optical counterpart DATE: 21/04/11 15:16:46 GMT FROM: David Palmer at LANL T. Sbarrato (INAF-OAB), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 15:05:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210411C (trigger=1042398). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 296.559, -39.373 which is RA(J2000) = 19h 46m 14s Dec(J2000) = -39d 22' 21" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 sec. The peak count rate was ~5500 counts/sec (15-350 keV), at ~4 sec after the trigger. The XRT began observing the field at 15:06:54.6 UT, 63.1 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 296.60899, -39.39786 which is equivalent to: RA(J2000) = 19h 46m 26.16s Dec(J2000) = -39d 23' 52.3" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 165 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 (8.10 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.2 (+2.66/-2.35) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of nominal 150.000 seconds with the White filter starting 66 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at RA(J2000) = 19:46:26.83 = 296.61178 DEC(J2000) = -39:23:51.9 = -39.39774 with a 90%-confidence error radius of about 1.10 arc sec. This position is 7.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.99. No correction has been made for the expected extinction corresponding to E(B-V) of 0.080. Burst Advocate for this burst is T. Sbarrato (tullia.sbarrato AT inaf.it). 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 29800 table
GRB_name GRB210411C
GCN_number 29800
Detection_method Swift-XRT Det
ra 296.6112°
decl -39.3979°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29800 SUBJECT: GRB 210411C: Enhanced Swift-XRT position DATE: 21/04/11 21:08:26 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 318 s of XRT Photon Counting mode data and 1 UVOT images for GRB 210411C, 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 = 296.61122, -39.39793 which is equivalent to: RA (J2000): 19h 46m 26.69s Dec (J2000): -39d 23' 52.6" with an uncertainty of 2.0 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 29802 table
GRB_name GRB210411C
GCN_number 29802
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29802 SUBJECT: GRB 210411C: LCO Optical Afterglow Candidate DATE: 21/04/11 22:59:47 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 210411C (Sbarrato, GCN 29794) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on April 11, from 16:18 to 16:42 UT (corresponding to 1.22 to 1.62 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 4x180s exposures in R and I. We detect an optical source in R and I band images at a location consistent the initial UVOT detection (Sbarrato, GCN 29794) and enhanced XRT position (Goad, GCN 29800), that is not present in either USNO or 2MASS catalogs. Using the USNO-B.1 catalog as reference, we calculate the following magnitudes: R = 18.51 +/- 0.03 I = 18.01 +/- 0.03 These magnitudes are not corrected for galactic extinction. These magnitudes may also be contaminated by a bright foreground star. R.S. is funded by NSF AST grant #1831682
GCN 29803 table
GRB_name GRB210411C
GCN_number 29803
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29803 SUBJECT: GRB 210411C: BOOTES-4/MET optical upper limit DATE: 21/04/11 23:14:20 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 (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report: Following the detection of GRB 210411C by Swift (Sbarrato et al. GCNC 29794), follow-up observations at the 0.6m BOOTES-4/MET robotic telescope in Lijiang Astronomical Observatory (China) were performed starting on Apr 11, 20:52 UT (~5.8 hr after trigger) at high airmass. No new source is detected down to 19.6 mag at the optical afterglow position reported by UVOT (Sbarrato et al. GCNC 29794) and the 1.0m LCO in Siding Spring (Strausbaugh et al. GCNC 29802) in our co-added image (25x60 s, clear filter) confirming the fading in the optical range. We thank the staff at Lijiang observatory for their excellent support. [GCN OPS NOTE(12apr21): Per author's request, the GRB name in the first sentence has been changed from "210406A" to 210411C".]
GCN 29804 table
GRB_name GRB210411C
GCN_number 29804
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29804 SUBJECT: Swift GRB 210411C: Global MASTER-Net observations report DATE: 21/04/12 08:13:01 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB 210411C ( T. Sbarrato et al., GCN 29794) errorbox 60730 sec after notice time and 60747 sec after trigger time at 2021-04-12 07:58:18 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 37 deg. The sun altitude is -38.0 deg. The galactic latitude b = -27 deg., longitude l = 1 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1589515 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 60837 | MASTER-OAFA | C | 180 | 19.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 29806 table
GRB_name GRB210411C
GCN_number 29806
Detection_method Optical
redshift 2.8260
Circular_text TITLE: GCN CIRCULAR NUMBER: 29806 SUBJECT: GRB 210411C: VLT/X-shooter redshift DATE: 21/04/12 10:46:55 GMT FROM: Daniele B Malesani at DTU Space A. de Ugarte Postigo (HETH/IAA-CSIC and DARK/NBI), B. Sbarufatti (PSU), D. Xu (NAO/CAS), J.-B. Vielfaure (APC, Paris University), D. B. Malesani (DTU Space), D. A. Kann (HETH/IAA-CSIC) V. D'Elia (ASI/SSDC, INAF/OAR), P. J. Pessi (FCAG/ESO), report on behalf of the Stargate consortium: We observed the optical afterglow of GRB 210411C (Sbarrato et al., GCN 29794) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures by 1200 s each (8x600 s in the NIR). The observation mid time was 2021 Apr 12.33 UT (16.9 hr after the GRB). In a 60 s image taken with the acquisition camera on Apr 12.294 UT, we detect the optical afterglow, for which we measure an AB magnitude r = 21.69 +- 0.04 (calibrated against nearby stars from the SkyMapper catalog; Wolf et al. 2018, PASA, 35, 010; https:doi.org/10.4225/41/593620ad5b574). We clearly detect continuum over the wavelength range 3520 - 17500 AA. A trough is visible around 4650 AA, which we identify as due to H I. From the detection of several narrow absorption features, which we interpret as due to, among others, Si II, Si II*, O I, C II, Si IV, C IV, Fe II, Al II, we infer a redshift z = 2.826. We also identify the FeII* 2396 fine-structure transition, though at low S/N. We acknowledge excellent support from the observing staff at Paranal, in particular Eleonora Sani and Bin Yang. [GCN OPS NOTE(12apr2021): Per author's request, GRB in the SUBJECT line was changed from 210411A" to the correct name "210411C".]
GCN 29807 table
GRB_name GRB210411C
GCN_number 29807
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 29807 SUBJECT: GRB 210411C: Swift-XRT refined Analysis DATE: 21/04/12 15:33:49 GMT FROM: Phil Evans at U of Leicester J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and T. Sbarrato report on behalf of the Swift-XRT team: We have analysed 6.4 ks of XRT data for GRB 210411C (Sbarrato et al. GCN Circ. 29794), from 66 s to 42.0 ks after the BAT trigger. The data comprise 136 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. 29800). The late-time light curve (from T0+5.4 ks) can be modelled with a power-law decay with a decay index of alpha=1.49 (+/-0.17). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.66 (+0.19, -0.18). The best-fitting absorption column is 1.2 (+0.4, -0.3) x 10^21 cm^-2, in excess of the Galactic value of 8.1 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.84 (+0.14, -0.11) and a best-fitting absorption column of 9.4 (+4.0, -1.3) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 9.4 (+4.0, -1.3) x 10^20 cm^-2 Galactic foreground: 8.1 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.84 (+0.14, -0.11) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01042398. This circular is an official product of the Swift-XRT team.
GCN 29808 table
GRB_name GRB210411C
GCN_number 29808
Detection_method Optical
ra 296.6118°
decl -39.3980°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29808 SUBJECT: GRB 210411C: ePESSTO+ NTT optical observations DATE: 21/04/12 20:22:21 GMT FROM: Daniele B Malesani at DTU Space P. Pessi (ESO), G. Csoernyei, A. Holas, S. Taubenberger, C. Vogl (MPA Garching), A. Floers (GSI), G. Pignata (UNAB), J. Teffs (Liverpool), M. Dennefeld (IAP), D. B. Malesani (DTU Space), P. D'Avanzo (INAF/Brera), J. Anderson (ESO), T. Müller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), E. Zimmerman (Weizmann) report: We observed the optical afterglow of GRB 210411C (Sbarrato et al., GCN 29794; Strausbaugh & Cucchiara, GCN 29802; de Ugarte Postigo et al., GCN 29806) under the the advanced Public ESO Spectroscopic Survey for Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40 and http://www.pessto.org ). The observations were performed on the ESO New Technology Telescope (NTT) at La Silla with the EFOSC2 instrument. A single 5-min exposure was acquired in the Gunn r filter, with mean epoch 2021 Apr 12.234 UT (14.55 hr after the GRB). The optical afterglow is well detected and we report the following coordinates (calibrated against the Gaia catalog): RA = 19:46:26.83 Dec = -39:23:52.7 For the afterglow, we measure a magnitude R = 21.28 +- 0.04 (Vega), assuming R = 17.31 for the USNO star at RA = 19:46:25.68, Dec = -39:23:48.9 . An extra uncertainty of ~0.3 mag should be added to account for the photometric calibration error of the USNO catalog.
GCN 29809 table
GRB_name GRB210411C
GCN_number 29809
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 29809 SUBJECT: GRB 210411C: Chilescope optical observations DATE: 21/04/12 20:40:48 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), M. Krugov (AFIF), N. Pankov (HSE) report on behalf of IKI-FuN follow-up collaboration: We observed the Swift GRB 210411C (Sbarrato et al., GCN 29794) with Chilescope RC-1000 started on April 12 (UT) 07:43:39 in r'-filter. We clearly detected optical afterglow (Sbarrato et al., GCN 29794; Strausbaugh et al., GCN 29802; Hu et al., GCN 29803; Lipunov et al., GCN 29804; de Ugarte Postigo et al., GCN 29806; Pessi et al., GCN 29808) in a stacked image with a total exposure of 3*600 seconds. Preliminary photometry is following. Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2021-04-12 07:43:39 0.70333 r' 3*600 21.76 0.16 22.4 The photometry is based on nearby stars from the SkyMapper catalog SMSS-DR1.1_id r 194633.88-392221.5 17.428 194648.73-392400.2 16.180
GCN 29810 table
GRB_name GRB210411C
GCN_number 29810
Detection_method Swift-BAT Det
ra 296.6010°
decl -39.3990°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29810 SUBJECT: GRB 210411C: Swift-BAT refined analysis DATE: 21/04/12 21:49:50 GMT FROM: Amy Lien at GSFC C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), T. Sbarrato (INAF-OAB), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210411C (trigger #1042398) (Sbarrato et al., GCN Circ. 29794). The BAT ground-calculated position is RA, Dec = 296.601, -39.399 deg which is RA(J2000) = 19h 46m 24.2s Dec(J2000) = -39d 23' 57.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 79%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+17 s. The two major peaks occur at ~T+4 s and ~T+11 s, respectively. T90 (15-350 keV) is 12.80 +- 0.60 sec (estimated error including systematics). The time-averaged spectrum from T-0.45 to T+14.44 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.60 +- 0.40, and Epeak of 14.8 +- 10.8 keV (chi squared 51.24 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+3.87 sec in the 15-150 keV band is 4.8 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.62 +- 0.09 (chi squared 68.87 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/1042398/BA/
GCN 29811 table
GRB_name GRB210411C
GCN_number 29811
Detection_method Swift-UVOT Det
ra 296.6117°
decl -39.3978°
Circular_text TITLE: GCN CIRCULAR NUMBER: 29811 SUBJECT: GRB 210411C: Swift/UVOT Detection DATE: 21/04/12 22:05:23 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and Sbarrato (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210411C 66 s after the BAT trigger (Sbarrato et al., GCN Circ. 29794). A source consistent with the XRT position (Goad et al. GCN Circ. 29800) is detected in the initial UVOT exposures. Further detections were reported by Strausbaugh et al. (GCN Circ 29802) The preliminary UVOT position is: RA (J2000) = 19:46:26.81 = 296.61170 (deg.) Dec (J2000) = -39:23:52.2 = -39.39784 (deg.) with an estimated uncertainty of 0.43 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 66 216 147 17.16 +/- 0.03 v 609 801 39 17.43 +/- 0.18 b 535 555 20 17.82 +/- 0.17 u 279 528 246 17.82 +/- 0.07 w1 658 1280 78 >19.7 m2 633 5836 83 >19.6 w2 584 5600 255 >20.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.081 in the direction of the burst (Schlegel et al. 1998).
GCN 29823 table
GRB_name GRB210411C
GCN_number 29823
Detection_method Swift-BAT Det
redshift 2.8260
Circular_text TITLE: GCN CIRCULAR NUMBER: 29823 SUBJECT: GRB 210411C: A very significant early X-ray afterglow DATE: 21/04/16 15:47:13 GMT FROM: Remo Rufinni at ICRA Y. Aimuratov, C.L. Bianco, L. Li, R. Moradi, F. Rastegar Nia, J.A. Rueda, R. Ruffini, N. Sahakyan, Y. Wang, S.S. Xue on behalf of the ICRANet team, report: GRB 210411C (trigger=1042398) with a redshift z=2.826 (A. de Ugarte Postigo et al, 2021, GCN29806) was triggered and located by Swift Burst Alert Telescope (BAT) (T. Sbarrato et al, 2021, GCN 29794) with T90=12.8 sec in 15-150 keV (C. B. Markwardt et al, 2021, GCN29810). The corresponding luminosity light curves of Swift-BAT and Swift-XRT (J.D. Gropp et al, 2021, GCN29807) show this source is a twin of GRB 190114C (Ruffini et al, 2021, https://doi.org/10.1093/mnras/stab724). A new additional feature is identified in the early luminosity of Swift-XRT data of GRB 210411C (see enclosed Fig.1). We recommend to check for the possible existence of a yet unobserved GeV radiation and to follow up the late keV and possible GeV temporal power-law luminosities. Fig. 1: http://www.icranet.org/documents/Swift_GRB210411C-Fermi_GRB190114C.pdf