GRB210610A

This page lists all entries on GRB210610A in GRBweb

Summary Fermi GBM IPN Swift GCN 30160 GCN 30161 GCN 30162 GCN 30163 GCN 30164 GCN 30165 GCN 30166 GCN 30167 GCN 30168 GCN 30169 GCN 30185 GCN 30186 GCN 30191 GCN 30192 GCN 30197 GCN 30200 GCN 30203 GCN 30211 GCN 30212 GCN 30214 GCN 30229 GCN 30232 GCN 30233 GCN 30246 GCN 30359 GCN 30775

Summary table
Variable Value Source
GRB_name_Fermi GRB210610628
T0 15:03:39.421 UTC Fermi_GBM
ra 204.2818° Swift
decl 14.4653° Swift
pos_error 7.90e-05° Swift
T90 8.192 s Fermi_GBM
T90_error 2.064 s Fermi_GBM
T90_start 15:03:39.421 UTC Fermi_GBM
fluence 1.28e-06 erg/cm² Fermi_GBM
fluence_error 4.12e-08 erg/cm² Fermi_GBM
redshift 3.5400 GCN_circulars,Optical
T100 17.199 s
GBM_located False
mjd 59375.627539594905 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB210610628
trigger_name bn210610628
ra 204.2821°
decl 14.4653°
pos_error 5.76e+00°
datum 2021-06-10
t_trigger 15:03:42.749 UTC
T90 8.192 s
T90_error 2.064 s
T90_start 15:03:39.421 UTC
fluence 1.28e-06 erg/cm²
fluence_error 4.12e-08 erg/cm²
flux_1024 3.56e+00 erg/cm²/s
flux_1024_error 2.80e-01 erg/cm²/s
flux_1024_time 7.04e-01 erg/cm²/s
flux_64 5.45e+00 erg/cm²/s
flux_64_error 1.37e+00 erg/cm²/s
IPN table
GRB_name GRB210610A
ra 204.2833°
decl 14.4833°
pos_error 5.00e-02°
redshift 3.5400
Swift table
GRB_name GRB210610A
t_trigger 15:03:43 UTC
ra 204.2818°
decl 14.4653°
pos_error 7.90e-05°
T90 13.62 s
fluence 1.00e-06 erg/cm²
redshift 3.5400
GCN 30160 table
GRB_name GRB210610A
GCN_number 30160
Detection_method Swift Det
t_trigger 15:03:43 UTC
ra 204.2850°
decl 14.4800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30160 SUBJECT: GRB 210610A: Swift detection of a burst with an optical counterpart DATE: 21/06/10 15:26:44 GMT FROM: David Palmer at LANL K. L. Page (U Leicester), M. A. Baer (PSU), J.D. Gropp (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 15:03:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210610A (trigger=1054627). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 204.285, +14.480 which is RA(J2000) = 13h 37m 08s Dec(J2000) = +14d 28' 49" 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 15 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 15:05:13.3 UT, 90.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 204.2823, 14.4652 which is equivalent to: RA(J2000) = 13h 37m 07.76s Dec(J2000) = +14d 27' 54.7" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 54 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. No spectrum from the promptly downlinked event data is yet available to determine the column density. UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 13:37:07.62 = 204.28174 DEC(J2000) = +14:27:55.0 = 14.46528 with a 90%-confidence error radius of about 0.61 arc sec. This position is 2.2 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.12 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.032. Burst Advocate for this burst is K. L. Page (klp5 AT leicester.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 30161 table
GRB_name GRB210610A
GCN_number 30161
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 30161 SUBJECT: GRB 210610A: MITSuME Akeno optical observation DATE: 21/06/10 16:13:57 GMT FROM: Ryohei Hosokawa at Tokyo Institute of Technology R. Hosokawa, K. L. Murata, M. Niwano, N. Ito, H. Takamatsu, Y. Imai, S. Sato, M. Takaku, R. Noto, R. Yamaguchi, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration: We observed the field of GRB 210610A (K. L. Page et al. GCN Circular #30160) 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 2021-06-10 15:04:41 UT (58 seconds after Swift BAT trigger). We stacked the images with good conditions. We detected the point source at the position consistent with the afterglow detected previously (K. L. Page et al. GCN Circular #30160) We measured the magnitudes as follows. filter MID-UT T-EXP[sec] measured magnitudes ------------------------------------------------------------------------------------------------ g' 15:08:47 10 16.4+/-0.4 Rc 15:08:29 50 15.3+/-0.1 Ic 15:08:29 50 15.0+/-0.2 ------------------------------------------------------------------------------------------------ T-EXP: Total Exposure time We used 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 30162 table
GRB_name GRB210610A
GCN_number 30162
Detection_method Optical
ra 204.2817°
decl 14.4653°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30162 SUBJECT: GRB 210610A: Xinglong-2.16m optical afterglow observations DATE: 21/06/10 16:20:29 GMT FROM: Dong Xu at NAOC/CAS D. Xu, Z.P. Zhu, S.Y. Fu, X. Liu (NAOC) report on behalf of a larger collaboration: We observed the field of GRB 210610A (Page et al., GCN 30160) using the 2.16-m optical telescope located at Xinglong, Hebei, China, equipped with the BFOSC camera. Observations started at 15:28:02 UT on 2021-06-10, i.e., 24.25 min after the burst. An uncatalogued and varying optical transient is detected at coordinates: R.A. (J2000) = 13:37:07.60 Dec. (J2000) = +14:27:55.0 with an error radius of ~ 0.3 arsec, positionally being well consistent with the Swift/UVOT detection (Page et al., GCN 30160). The OT is thus the optical afterglow of the GRB, and it has r = 16.97 +/- 0.01 mag at 26.25 min post-burst, calibrated with the nearby PanSTAR field. Spectroscopy of the afterglow is underway.
GCN 30163 table
GRB_name GRB210610A
GCN_number 30163
Detection_method Optical
ra 204.2818°
decl 14.4653°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30163 SUBJECT: GRB 210610A: GIT optical detection DATE: 21/06/10 16:57:26 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar(IITB), V. Bhalerao(IITB), U. Stanzin (IAO), G. C. Anupama(IIA), S. Barway(IIA) report on behalf of the GIT team: We observed GRB 210610A detected by Swift-BAT ( K. L. Page et al., GCN #30160, optical counterpart reported by R. Hosokawa et al., GCN #30161 and D. Xu et al., GCN #30162), with the 0.7m GROWTH-India Telescope (GIT). We obtained a 300-sec exposure in the r' filter. We clearly detected the afterglow in our image at R.A.= 13:37:07.64 and DEC.= 14:27:55.10. The photometric results follow as: ------------------------------------------------------------------- JD (start) | T_mid-T0(hrs) | Filter | Magnitude (AB) | ------------------------------------------------------------------- 2459376.178 | 1.22 | r' | 18.79+/- 0.05 | ------------------------------------------------------------------- The magnitudes are calibrated against PanSTARRS DR1 (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).
GCN 30164 table
GRB_name GRB210610A
GCN_number 30164
Detection_method Optical
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30164 SUBJECT: GRB 210610A: Xinglong-2.16m redshift DATE: 21/06/10 17:26:59 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu, D. Xu, S.Y. Fu, X. Liu (NAOC) report on behalf of a larger collaboration: Following the photometry of the optical afterglow (Xu et al., GCN 30162) of GRB 210610A (Page et al., GCN 30160), we carried out 2x1800 s spectroscopy of the afterglow using the BFOSC camera. The spectrum covers the wavelength range 4000-9000 AA. The observation mid time is 2021 June 10.667 UT, i.e., 0.955 hr after the burst. In our spectra, continuum is detected over the whole observed range. A prominent absorption feature is detected around 5519 AA, which we identify as Ly alpha in absorption, and blueward of which is Ly alpha forest. The interpretation is confirmed by the detection of metal absorption lines such as Si II, Si IV, C IV, all at a common redshift z = 3.54, using old calibrations. The redshift measurement may be improved a bit when new calibrations are available. We thank the excellent support of the Xinglong-2.16m staff, especially Junjun Jia and Jie Zheng.
GCN 30165 table
GRB_name GRB210610A
GCN_number 30165
Detection_method Swift-XRT Det
ra 204.2821°
decl 14.4654°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30165 SUBJECT: GRB 210610A: Enhanced Swift-XRT position DATE: 21/06/10 18:08:33 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 792 s of XRT Photon Counting mode data and 1 UVOT images for GRB 210610A, 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 = 204.28211, +14.46540 which is equivalent to: RA (J2000): 13h 37m 7.71s Dec (J2000): +14d 27' 55.4" with an uncertainty of 2.3 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 30166 table
GRB_name GRB210610A
GCN_number 30166
Detection_method Optical
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30166 SUBJECT: Swift GRB 210610A: MASTER optical counterpart observation DATE: 21/06/10 18:47:50 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, K.Zhirkov, V.Kornilov, E.Gorbovskoy, I.Gorbunov,P.Balanutsa,V.Vladimirov,A.Kuznetsov, D. Vlasenko, N.Tiurina, D.Zimnukhov, V.Senik, V.Topolev, A.Chasovnikov, D.Cheryasov (Lomonosov MSU,SAI,PhysicsDepartment), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), 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 Swift GRB 210610A (Page et al. GCN 30160) error box observation at 2021-06-10 16:23:35UT at MASTER-SAAO. There is MASTER OT J133707.60+142755.0 with m_OT~20.1m (unfiltered), that was discovered by Swift-UVOT (Page et al. 30160) and confirmed by Hosokawa et al. GCN 30161, Xu et al. GCN 30162, Kumar et al. GCN 30163, and with redshift z=3.54 detected by Zhu et al. GCN 30164. Observation and reduction will be continued.
GCN 30167 table
GRB_name GRB210610A
GCN_number 30167
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 30167 SUBJECT: Swift GRB 210610A: Global MASTER-Net observations report DATE: 21/06/10 18:47:58 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 210610A ( K. L. Page et al., GCN 30160) errorbox 4610 sec after notice time and 4632 sec after trigger time at 2021-06-10 16:20:55 UT, with upper limit up to 17.1 mag. Observations started at twilight. The observations began at zenith distance = 58 deg. The sun altitude is -8.5 deg. The galactic latitude b = 73 deg., longitude l = 346 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1633161 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 4662 | MASTER-SAAO | C | 60 | 16.8 | 4742 | MASTER-SAAO | C | 60 | 16.9 | 4822 | MASTER-SAAO | C | 60 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 30168 table
GRB_name GRB210610A
GCN_number 30168
Detection_method Optical
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30168 SUBJECT: GRB210610A: MeerLICHT multi-colour photometry DATE: 21/06/10 18:56:04 GMT FROM: Paul Vreeswijk at Radboud U/Nijmegen S. de Wet (UCT), P.M. Vreeswijk (Radboud), P.J. Groot (Radboud/UCT/SAAO), A. Levan (Radboud) report on behalf of the MeerLICHT consortium: Following the detection of GRB210610A by Swift and its optical counterpart (Page et al., GCN 30160), reported at a redshift of z=3.54 by Zhu et al. (GCN 30163), the 0.6m MeerLICHT telescope, located at Sutherland, South Africa began observations of the field at 2021-06-10, 16:48:47 UT with a repeating sequence of optical filters: q,u,q,g,q,r,q,i,q,z, at 60s integration time each. The q-band wavelength limits are 440-720nm. First detections are: q_AB = 19.60 +/- 0.08 +/- 0.02 at 16:48:47 UT r_AB = 19.09 +/- 0.10 +/- 0.01 at 16:56:12 UT i_AB = 18.74 +/- 0.12 +/- 0.02 at 16:59:10 UT z_AB = 18.37 +/- 0.19 +/- 0.02 at 17:02:09 UT, where the first uncertainty on the magnitude is the statistical uncertainty and the second is the uncertainty on the photometric calibration. In g-band the afterglow is detected only once, at 17:08:11 UT, at g_AB = 20.18 +/- 0.18 +/- 0.03, close to the limiting magnitude of the frame. The source is not detected in the u-band, starting at 16:50:11 UT, at a 5-sigma limiting magnitude of u_AB > 18.76. Further fading of the source is observed during the ongoing sequence. MeerLICHT is built and run by a consortium consisting of Radboud University, the University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.
GCN 30169 table
GRB_name GRB210610A
GCN_number 30169
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 30169 SUBJECT: GRB 210610A: MITSuME Ishigaki optical observation DATE: 21/06/10 19:54:13 GMT FROM: Takashi Horiuchi at Ishigakijima Astronomical Obs Takashi Horiuchi, Hidekazu Hanayama (NAOJ), Katsuhiro L. Murata, Yoichi Yatsu, Nobuyuki Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 210610A (K. L. Page et al. GCN Circular #30160) with the optical three color (g', Rc, and Ic) CCD cameras attached to the 105 cm Murikabushi telescope of Ishigakijima Astronomical Observatory, Okinawa, Japan. The observation with a series of 60 sec exposures started on 2021-06-10 15:40:04 UT (37 min after Swift BAT trigger). We detected the point source at the position consistent with the afterglow reported by K. L. Page et al. GCN Circular #30160. Here, we removed bad data (images) with wrong sky conditions and obtained the magnitudes as follows: T0+[min] MID-UT T-EXP[sec] measured magnitudes ------------------------------------------------------------------------------------------------ 37 2021-06-10T15:57:45 900 (60s × 15) g'=19.41+/-0.14, Rc=18.19+/-0.04, Ic=17.73+/-0.10 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time The SDSS catalog (DR16) is used for flux calibration.
GCN 30185 table
GRB_name GRB210610A
GCN_number 30185
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30185 SUBJECT: GRB 210610A: 1.5m OSN optical observation DATE: 21/06/10 23:49:51 GMT FROM: Youdong HU at IAA-CSIC T.-R. Sun, Y.-D. Hu, A. Sota, A. J. Castro-Tirado, M. D. Caballero-Garcia, M. A. Castro Tirado and E. Fernandez-Garcia (IAA-CSIC), on behalf of a larger collaboration, report: Following the detection of GRB 210610A by Swift (Page et al. GCNC 30160), images in BVRI bands were obtained at the 1.5m OSN telescope in Granada (Spain) starting after the twilight as soon as it was possible. In the first I-band 90 s exposure image, the optical afterglow with I = 19.85+-0.18 at 21:12 UT (~6.1 hr after trigger) is clearly seen within the enhanced XRT position (Goad et al. GCNC 30165), which also detected by UVOT/Swift (Page et al. GCNC 30160), MITSuME (Hosokawa et al. GCNC 30161 and Horiuchi et al. GCNC 30169), Xinglong (Xu et al. GCNC 30162), MASTER (Lipunov et al. GCNC 30166) and MeerLICHT (de Wet et al. GCNC 30168). Further observations are ongoing. We thank the staff at OSN for their excellent support.
GCN 30186 table
GRB_name GRB210610A
GCN_number 30186
Detection_method Swift-BAT Det
ra 204.2840°
decl 14.4760°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30186 SUBJECT: GRB 210610A: Swift-BAT refined analysis DATE: 21/06/11 01:02:19 GMT FROM: Amy Lien 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), K. L. Page (U Leicester), 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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210610A (trigger #1054627) (Page et al., GCN Circ. 30160). The BAT ground-calculated position is RA, Dec = 204.284, 14.476 deg which is RA(J2000) = 13h 37m 08.2s Dec(J2000) = +14d 28' 32.5" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%. The mask-weighted light curve shows a structure with two overlapping pulses that starts at ~T-6 s and ends at ~T+11 s. The two peaks occur at ~T-2 s and ~T0, respectively. T90 (15-350 keV) is 13.62 +- 3.15 sec (estimated error including systematics). The time-averaged spectrum from T-5.98 to T+11.35 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.19. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.29 sec in the 15-150 keV band is 2.5 +- 0.4 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/1054627/BA/
GCN 30191 table
GRB_name GRB210610A
GCN_number 30191
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 30191 SUBJECT: GRB 210610A: RATIR Optical and NIR Detection DATE: 21/06/11 05:59:57 GMT FROM: Alan M Watson at UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report: We observed the field of GRB 210610A (Page et al., GCN Circ. 30160) with the Reionization and Transients Infrared Camera (RATIR) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2021/06 11.18 to 2021/06 11.23 UTC (13.00 to 14.06 hours after the BAT trigger), obtaining a total of 0.61 hours exposure in the r and i bands and 0.25 hours exposure in the Z, Y, J, and H bands. We detect the afterglow with the following magnitudes and 3-sigma upper limit: r = 21.39 +/- 0.06 i = 21.35 +/- 0.07 Z = 20.74 +/- 0.10 Y = 21.05 +/- 0.22 J = 20.70 +/- 0.25 H > 20.12 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 30192 table
GRB_name GRB210610A
GCN_number 30192
Detection_method Swift-XRT Other
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30192 SUBJECT: GRB 210610A: Swift-XRT refined Analysis DATE: 21/06/11 06:21:16 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), J.A. Kennea (PSU) and K.L. Page report on behalf of the Swift-XRT team: We have analysed 7.1 ks of XRT data for GRB 210610A (Page et al. GCN Circ. 30160), from 97 s to 45.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 30165). The late-time light curve (from T0+4.1 ks) can be modelled with a power-law decay with a decay index of alpha=1.05 (+/-0.10). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.84 (+0.12, -0.10). The best-fitting absorption column is 2.6 (+9.0, -2.6) x 10^21 cm^-2, at a redshift of 3.54, in addition to the Galactic value of 2.2 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 3.5 x 10^-11 (3.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 2.2 x 10^20 cm^-2 Intrinsic column: 2.6 (+9.0, -2.6) x 10^21 cm^-2 at z=3.54 Photon index: 1.84 (+0.12, -0.10) If the light curve continues to decay with a power-law decay index of 1.05, the count rate at T+24 hours will be 9.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.4 x 10^-13 (3.6 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/01054627. This circular is an official product of the Swift-XRT team.
GCN 30197 table
GRB_name GRB210610A
GCN_number 30197
Detection_method Konus-Wind Det
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30197 SUBJECT: Konus-Wind detection of GRB 210610A DATE: 21/06/11 11:56:36 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, A.Lysenko, D. Svinkin, A. Ridnaya, A. Tsvetkova, M. Ulanov, and T. Cline, report: The long GRB 210610A (Swift-BAT detection: Page et al., GCN 30160; Barthelmy et al., GCN 30186), T0 (BAT) = 15:03:43/387, was detected by Konus-Wind (KW) in the waiting mode. A Bayesian block analysis of the KW waiting mode data in the 20-400 keV band reveals a ~8 sigma count rate increase over background in the interval from ~T0(BAT)-2 s to ~T0(BAT)+4 s. The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB210610A/ Modeling the KW 3-channel spectrum by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.17(-0.83,+1.15) and Ep = 148(-63,+87) keV. In the 10 keV -10 MeV band, the total burst fluence is (1.3 ± 0.5)x10^-6 erg/cm^2, and the 2.944 s peak energy flux is (2.7 ± 0.8)x10^-7 erg/cm^2. Assuming the redshift z=3.54 (Zhu et al., GCN 30164) and a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the isotropic energy release E_iso to ~3.5x10^52 erg, the isotropic luminosity L_iso to ~3.3x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum Ep,z to ~670 keV. With these values, GRB 210610A is within 90% prediction bands for for the 'Amati' relation for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2021, ApJ, 908, 83), see http://www.ioffe.ru/LEA/GRBs/GRB210610A/GRB210610A_rest_frame.pdf All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN 30200 table
GRB_name GRB210610A
GCN_number 30200
Detection_method Swift-BAT Det
redshift 3.5000
Circular_text TITLE: GCN CIRCULAR NUMBER: 30200 SUBJECT: GRB 210610A: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope DATE: 21/06/11 15:28:13 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay A. Dutta (IIA), H. Kumar (IITB), D. K. Sahu (IIA), B. Kumar (ARIES), G. C. Anupama (IIA), V. Bhalerao (IITB), S. Barway (IIA) report on behalf of a larger Indian collaboration: We obtained a spectrum of the GRB 210210A detected by Swift-BAT ( K. L. Page et al., GCN #30160), with the HFOSC instrument mounted on the 2-m Himalayan Chandra Telescope at the Indian Astronomical Observatory. We obtained a wavelength coverage of 3800 - 8000 angstrom. We took a 2700 second exposure on 2021 June 10 16:48 (UTC). The spectrum is continuum-dominated with a broad absorption feature at ~5509 A which we interpret as Lyman alpha (rest-frame wavelength 1216 A) at a redshift of z=3.5, consistent with the redshift reported by Zhu et al. (GCN #30164. Other absorption features due to Si II (1307 A), Si IV (1397 A), CIV (1549 A) at the same redshift are also observed. The spectrum has not been corrected for reddening. We thank the staff at IAO and CREST, Hosakote, for helping with the observations. The Indian Astronomical Observatory and CREST are operated by the Indian Institute of Astrophysics, Bengaluru, India.
GCN 30203 table
GRB_name GRB210610A
GCN_number 30203
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30203 SUBJECT: GRB 210610A: KAIT Optical Detection DATE: 21/06/11 16:47:54 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 the Swift GRB 210610A (Page et al., GCN 30160) starting at ~14.22 hours after the Swift trigger (Page et al. GCN 30160). A total of 30x60s images were obtained in the clear (roughly R) filters. We detect the optical afterglow (e.g. Page et al., GCN 30160) in the coadd image with a mag of 21.2 +/- 0.2, calibrated to the Pan-STARRS1 catalog.
GCN 30211 table
GRB_name GRB210610A
GCN_number 30211
Detection_method Konus-Wind Det
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30211 SUBJECT: GRB 210610A: CAHA 2.2m observations and light-curve behavior DATE: 21/06/11 20:58:31 GMT FROM: Alexander Kann at IAA-CSIC D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), J. F. Agui Fernandez, C. C. Thoene, M. Blazek (all HETH/IAA-CSIC), A. Fernandez, I. Hermelo, and S. Pedraz (all CAHA) report: We observed the afterglow (Page et al., GCN #30160; Hosokawa et al., GCNs #30161, #30169; Xu et a., GCN #30162; Kumar et al., GCN #30163; Lipunov et al., GCN #30166; de Wet et al., GCN #30168; Sun et al., GCN #30185; Watson et al., GCN #30191; Zheng et al., GCN #30203) of GRB 210610A, discovered by Swift (Page et al., GCN #30160) and also detected by Konus-Wind (Frederiks et al., GCN #30197) at redshift z=3.54 (Zhu et al., GCN #30164; Dutta et al., GCN #30200). with CAFOS mounted on the 2.2m telescope at Calar Alto, Almeria, Spain. We obtained 5 x 180 s in Sloan i' before switching to observations of GRB 210610B. After these, we obtained 3 x 300 s each in Sloan r' and g'. The afterglow is detected in individual frames. Stacking the images, we measure, against nearby comparison stars from the SDSS catalog (AB mags, not corrected for Galactic extinction): i' = 20.18 +/- 0.04 mag at 0.23677 d; r' = 20.87 +/- 0.05 mag at 0.36333 d; g' = 21.92 +/- 0.08 mag at 0.37687 d. Using our data as well as data given in the GCN Circulars cited above, we find that after 0.03 d, the light curve can be described with a broken power-law fit, with alpha_1 = 0.84, alpha_2 = 1.24, and t_break = 0.16 d. Earlier data is brighter than the back-extrapolation of the fit, indicating a steeper decay must have taken place.
GCN 30212 table
GRB_name GRB210610A
GCN_number 30212
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30212 SUBJECT: GRB 210610A: CrAO/ZTSH optical observations DATE: 21/06/11 21:17:06 GMT FROM: Alexei Pozanenko at IKI, Moscow N. Pankov (IKI, HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO), S. Belkin (IKI, HSE) report on behalf of IKI GRB FuN: We observed the GRB 210610A (Page et al., GCN 30170) with ZTSH 2.6m telescope of CrAO observatory starting on June 11 (UT) 19:46:53. The optical afterglow first reported by UVOT (Page et al., GCN 30170) is clearly detected in each of a single image of 120 exposure in R filter. Preliminary photometry of the afterglow in the first image is following Date UT start t-T0 Filter Exp. OT err (mid, days) (s) 2021-06-11 19:46:53 0.99683 R 1*120 19.50 0.12 The photometry is based on several nearby USNO-B1.0 (R2) stars USNO-B1.0 id USNO_B10-1043-00282648 USNO_B10-1043-00282621
GCN 30214 table
GRB_name GRB210610A
GCN_number 30214
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30214 SUBJECT: GRB 210610A: CrAO/ZTSH optical observations DATE: 21/06/11 22:36:11 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI, HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO), N. Pankov (IKI, HSE) report on behalf of IKI GRB FuN: We observed the GRB 210610A (Page et al., GCN 30160) with ZTSH 2.6m telescope of CrAO observatory on June 10 starting on (UT) 18:29:17, and June 11 starting on (UT) 18:53:09. The optical afterglow first reported by UVOT (Page et al., GCN 30160) is clearly detected in each of a single images in R filter in both epochs. Preliminary photometry of the afterglow in the first image on June 10, and combined image on the June 11 is following Date UT start t-T0 Filter Exp. OT err UL(3 sigma) (mid, days) (s) 2021-06-10 18:29:17 0.14310 R 1*60 19.47 0.12 20.7 2021-06-11 18:53:09 1.16766 R 12*120 22.19 0.17 23.0 The photometry is based on nearby SDSS DR12 stars SDSS-DR12_id RA DEC B(Lupton transformation) R(Lupton transformation) J133717.13+142854.9 204.32139900 +14.48192200 17.8777 17.0295 J133703.62+142832.7 204.26512000 +14.47576300 19.2842 17.7239 J133658.05+142404.4 204.24188500 +14.40123200 20.3290 18.3616 The light curve of can be found in http://grb.rssi.ru/GRB210610A/GRB210610A_LC.png Initial power law index of the light curve in the first epoch is about -0.82, and it is steepening between the two epochs down to -1.03 which is compatible with broken power-law fit reported by D.A. Kann et al. (GCN 30211).
GCN 30229 table
GRB_name GRB210610A
GCN_number 30229
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30229 SUBJECT: GRB 210610A: SAO RAS optical observations DATE: 21/06/13 13:22:59 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin and O. A. Maslennikova (SAO RAS), report on behalf of the GRB follow-up team. We observed the field of the GRB 210610A (Page et al., GCN #30160) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer in Rc band on June 11 and 12. We clearly detected the GRB OT (Page et al., GCN #30160; Hosokawa et al., GCNs #30161, #30169; Xu et al., GCN #30162; Kumar et al., GCN #30163; Zhu et al., GCN # 30164; Lipunov et al., GCN #30166; de Wet et al., GCN #30168; Horiuchi et al., GCN #30169; Sun et al., GCN #30185; Watson et al., GCN #30191; Dutta et al., GCN #30200; Zheng et al., GCN #30203, Kann et al., GCN #30211; Belkin et al., GCN #30214) in the stacked frame obtained on June 11 and marginally detected the object in the stacked frame obtained on June 12. Date UT_start UT_end Exp., s T_mid-T0, d R mag June, 11 20:12:02--21:08:03 8 x 300 1.23356 22.43 +/- 0.14 June, 12 19:46:09--21:08:36 12 x 300 2.22477 23.3 +/- 0.3 The preliminary photometry is based on magnitudes of the nearby SDSS stars (transformed with the Lupton 2005 equations). The OT magnitudes were not corrected for MW extinction.
GCN 30232 table
GRB_name GRB210610A
GCN_number 30232
Detection_method Konus-Wind Det
redshift 3.5400
Circular_text TITLE: GCN CIRCULAR NUMBER: 30232 SUBJECT: GRB 210610A: CAHA 2.2m Second Epoch DATE: 21/06/13 21:56:50 GMT FROM: Alexander Kann at IAA-CSIC D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), J. F. Agui Fernandez, C. C. Thoene, M. Blazek (all HETH/IAA-CSIC), A. Fernandez-Martin (CAHA), and M. Azzaro (IAA-CSIC) report: We re-observed the afterglow (Page et al., GCN #30160; Hosokawa et al., GCNs #30161, #30169; Xu et a., GCN #30162; Kumar et al., GCN #30163; Lipunov et al., GCN #30166; de Wet et al., GCN #30168; Sun et al., GCN #30185; Watson et al., GCN #30191; Zheng et al., GCN #30203; Kann et al., GCN #30211; Belkin et al., GCN #30214; Moskvitin et al., GCN #30229) of GRB 210610A, discovered by Swift (Page et al., GCN #30160) and also detected by Konus-Wind (Frederiks et al., GCN #30197) at redshift z = 3.54 (Zhu et al., GCN #30164; Dutta et al., GCN #30200). with CAFOS mounted on the 2.2m telescope at Calar Alto, Almeria, Spain. We obtained 6 x 600 s exposure in Sloan r'. Stacking the images, the afterglow is well-detected, and we measure, against nearby comparison stars from the SDSS catalog (AB mags, not corrected for Galactic extinction): r' = 22.57 +/- 0.04 mag at 1.27366 d. This value is in good agreement with the observations of Belkin et al., GCN #30214; Moskvitin et al., GCN #30229, as well as the extrapolation of the decay found by Kann et al., GCN #30211.
GCN 30233 table
GRB_name GRB210610A
GCN_number 30233
Detection_method Fermi GBM Det
t_trigger 15:03:42.750 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 30233 SUBJECT: GRB 210610A: Fermi GBM observations DATE: 21/06/14 13:35:12 GMT FROM: Peter Veres at UAH P. Veres (UAH), B. Hristov (UAH) and C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 15:03:42.75 UT on 10th of June 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210610A (trigger 645030227 / 210610628). The burst was also detected by the Swift/BAT (Page et al., GCN 30160). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 67 degrees. The GBM light curve consists of two pulses with a duration (T90) of about 8 s (50-300 keV). The time-averaged spectrum from T0-3.1 s to T0+4.6 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.11 +/- 0.15 and the cutoff energy, parameterized as Epeak, is 247 +/- 74 keV. The event fluence (10-1000 keV) in this time interval is (1.78 +/- 0.23)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.7 s in the 10-1000 keV band is 3.6 +/- 0.3 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 30246 table
GRB_name GRB210610A
GCN_number 30246
Detection_method Swift-UVOT Det
ra 204.2816°
decl 14.4653°
redshift 3.5000
Circular_text TITLE: GCN CIRCULAR NUMBER: 30246 SUBJECT: GRB 210610A: Swift/UVOT Detection DATE: 21/06/17 13:36:23 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU), M. Baer (PSU) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210610A 94 s after the BAT trigger (Page et al., GCN Circ. 30160). A fading source consistent with the XRT position (Goad et al. GCN Circ. 30165) and the previously reported optical counterpart (Hosokawa et al., GCN. Circ. 30161; Xu et al., GCN. Circ. 30162; Kumar et al., GCN Circ. 30163; Lipunov et al., GCN. 30166; de Wet et al. GCN Circ. 30168; Horiuchi et al., GCN Circ. 30169; Youdong et al., GCN Circ. 30185; Watson et al. GCN Circ. 30191) is detected in the initial UVOT exposures. The lack of detection in the NUV filters for this bright counterpart is consistent with the redshift of 3.5 reported by Zhu et al. (GCN Circ. 30164) and Dutta et al. (GCN Circ. 30200). The preliminary UVOT position is: RA (J2000) = 13:37:07.59 = 204.28161 (deg.) Dec (J2000) = +14:27:55.0 = 14.46527 (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 (fc) 94 244 147 17.09+/-0.03 white 587 892 68 17.92+/-0.07 v 636 829 38 16.74+/-0.14 v 4299 4498 196 >18.92 b 562 754 38 17.69+/-0.12 b 16163 17070 885 20.57+/-0.23 b 23125 45112 1552 >21.16 u 307 557 245 >20.02 uvw1 685 4908 216 >19.37 uvm2 4503 4703 196 >19.16 uvw2 4094 4294 196 >19.10 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.032 in the direction of the burst (Schlegel et al. 1998).
GCN 30359 table
GRB_name GRB210610A
GCN_number 30359
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 30359 SUBJECT: GRB 210610A: JCMT SCUBA-2 sub-mm observations DATE: 21/07/03 08:53:23 GMT FROM: Ian Smith at Rice U I.A. Smith (Rice U.), D.A. Perley (LJMU), and N.R. Tanvir (U. of Leicester) report: We observed the Swift UVOT location of GRB 210610A (Page et al., GCN Circ. 30160) using the SCUBA-2 sub-millimeter continuum camera on the James Clerk Maxwell Telescope. Observations totaling 3.1 hours were obtained on UT 2021-06-11, 2021-06-12, and 2021-06-13 in good weather conditions each day. No counterpart was detected in the individual or combined maps. Combining all the data, the RMS background noise was 0.91 mJy/beam at 850 microns and 6.2 mJy/beam at 450 microns; the mid-point of the run was 1.73 days after the burst trigger. We thank Patrice Smith, Alexis-Ann Acohido, Harriet Parsons, Mark Rawlings, and the JCMT staff for the prompt support of these observations that were taken under project M21AP020.
GCN 30775 table
GRB_name GRB210610A
GCN_number 30775
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 30775 SUBJECT: GRB 210610A: Maidanak and AbAO optical observations DATE: 21/09/05 23:23:17 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), O. Burhonov (UBAI), R. Ya. Inasaridze (AbAO), N. Pankov (IKI), V. R. Ayvazian (AbAO), D. Datashvili (AbAO), G. V. Kapanadze (AbAO), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN: We observed the field of GRB 210610A (Page et al., GCN 30160) with AZT-22 telescope of Maidanak Observatory and AS-32 telescope of Abastumani observatory (AbAO). The optical afterglow (Page et al., GCN 30160; Hosokawa et al., GCN 30161; Xu et a., GCN 30162; Kumar et al., GCN 30163; Lipunov et al., GCN 30166; de Wet et al., GCN 30168; Hosokawa et al., GCN 30169; Sun et al., GCN 30185; Watson et al., GCN 30191; Zheng et al., GCN 30203; Kann et al., GCN 30211; Belkin et al., GCN 30214; Moskvitin et al., GCN 30229; Kann et al., GCN 30232; Siegel et al., GCN 30246) is clearly detected in the stacked images. Preliminary photometry of the afterglow is following. Date UT start t-T0 Filter Exp. OT UL(3sigma) Telescope (mid, days) (s) 2021-06-10 17:57:56 0.14529 R 14*300 19.62 0.03 24.0 AZT-22 2021-06-10 20:24:59 0.23769 R 42*60 20.46 0.25 20.6 AS-32 2021-06-12 16:34:08 2.07494 R 7*300 23.09 0.20 23.5 AZT-22 2021-06-13 16:44:01 3.09049 R 12*300 23.77 0.21 24.4 AZT-22 2021-06-14 17:25:22 4.11920 R 12*300 24.08 0.28 24.4 AZT-22 Photometry is based on the SDSS-DR12 nearby stars (Lupton transformations). SDSS-DR12_id RA DEC R(Lupton) J133717.13+142854.9 204.32139900 +14.48192200 17.0295 J133703.62+142832.7 204.26512000 +14.47576300 17.7239 Using our data in the R filter, it was found that the light curve can be described by a broken power-law with power law indices of -0.82 and -1.39. The break time is 0.23+/-0.17 days. These values are consistent with the result reported by Kann et al. (GCN 30211). The light curve can be found at http://grb.rssi.ru/GRB210610A/GRB210610A_LC.png