GRB201017A

This page lists all entries on GRB201017A in GRBweb

Summary Fermi GBM IPN Swift GCN 28665 GCN 28666 GCN 28667 GCN 28670 GCN 28671 GCN 28672 GCN 28675 GCN 28678 GCN 28679 GCN 28682 GCN 28684 GCN 28691 GCN 28692 GCN 28693

Summary table
Variable Value Source
GRB_name_Fermi GRB201017407
T0 9:46:28.534 UTC Fermi_GBM
ra 36.6202° Swift
decl 66.6788° Swift
pos_error 3.37e-04° Swift
T90 8.96 s Fermi_GBM
T90_error 3.435 s Fermi_GBM
T90_start 9:46:28.534 UTC Fermi_GBM
fluence 1.41e-06 erg/cm² Fermi_GBM
fluence_error 8.05e-08 erg/cm² Fermi_GBM
T100 24.546 s
GBM_located False
mjd 59139.40727469907 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB201017407
trigger_name bn201017407
ra 36.6187°
decl 66.6786°
pos_error 5.72e+00°
datum 2020-10-17
t_trigger 9:46:32.630 UTC
T90 8.96 s
T90_error 3.435 s
T90_start 9:46:28.534 UTC
fluence 1.41e-06 erg/cm²
fluence_error 8.05e-08 erg/cm²
flux_1024 2.95e+00 erg/cm²/s
flux_1024_error 2.70e-01 erg/cm²/s
flux_1024_time -8.96e-01 erg/cm²/s
flux_64 4.99e+00 erg/cm²/s
flux_64_error 1.36e+00 erg/cm²/s
IPN table
GRB_name GRB201017A
ra 36.6333°
decl 66.6667°
pos_error 5.00e-02°
Swift table
GRB_name GRB201017A
t_trigger 9:46:31 UTC
ra 36.6202°
decl 66.6788°
pos_error 3.37e-04°
T90 22.08 s
fluence 9.00e-07 erg/cm²
GCN 28665 table
GRB_name GRB201017A
GCN_number 28665
Detection_method Fermi GBM final loc
t_trigger 9:46:32 UTC
ra 21.7000°
decl 63.5000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28665 SUBJECT: GRB 201017A: Fermi GBM Final Real-time Localization DATE: 20/10/17 09:56:54 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 09:46:32 UT on 17 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201017A (trigger 624620797.629664 / 201017407). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 21.7, Dec = 63.5 (J2000 degrees, equivalent to J2000 01h 26m, 63d 30'), with a statistical uncertainty of 7.3 degrees. The angle from the Fermi LAT boresight is 100.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_skymap_all_bn201017407.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_healpix_all_bn201017407.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201017407/quicklook/glg_lc_medres34_bn201017407.gif
GCN 28666 table
GRB_name GRB201017A
GCN_number 28666
Detection_method Swift Det
t_trigger 9:46:31 UTC
ra 36.6330°
decl 66.6730°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28666 SUBJECT: GRB 201017A: Swift detection of a burst DATE: 20/10/17 10:03:23 GMT FROM: Boris Sbarufatti at PSU A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC), J.D. Gropp (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), T. Sakamoto (AGU) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 09:46:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201017A (trigger=1000613). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 36.633, +66.673 which is RA(J2000) = 02h 26m 32s Dec(J2000) = +66d 40' 22" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 10 sec. Data from ~T+10 s to ~T+100 s are currently unavailable. There might be additional burst emission during this interval. The peak count rate was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 09:48:15.1 UT, 103.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 36.6186, 66.6787 which is equivalent to: RA(J2000) = 02h 26m 28.45s Dec(J2000) = +66d 40' 43.4" with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 29 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 consistent with the Galactic value of 5.70 x 10^21 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 106 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 1.20. Burst Advocate for this burst is A. D'Ai (antonino.dai 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 28667 table
GRB_name GRB201017A
GCN_number 28667
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 28667 SUBJECT: Swift GRB 201017A: Global MASTER-Net observations report DATE: 20/10/17 11:58:14 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 201017A ( A. D'Ai et al., GCN 28666) errorbox 7302 sec after notice time and 7410 sec after trigger time at 2020-10-17 11:50:02 UT, with upper limit up to 19.1 mag. Observations started at twilight. The observations began at zenith distance = 44 deg. The sun altitude is -16.4 deg. The galactic latitude b = 6 deg., longitude l = 132 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1463193 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 7501 | MASTER-Tunka | C | 180 | 19.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 28670 table
GRB_name GRB201017A
GCN_number 28670
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 28670 SUBJECT: GRB 201017A: Xinglong TNT upper limit DATE: 20/10/17 13:56:51 GMT FROM: Liping Xin at NAOC, SVOM PGh0bWw+DQo8aGVhZD4NCiAgICA8bWV0YSBodHRwLWVxdWl2PSdDb250ZW50 LVR5cGUnIGNvbnRlbnQ9J3RleHQvaHRtbDsgY2hhcnNldD1VVEYtOCc+DQo8 L2hlYWQ+DQo8Ym9keT4NCjxzdHlsZT4NCiAgICBmb250ew0KICAgICAgICBs aW5lLWhlaWdodDogMS42Ow0KICAgIH0NCiAgICB1bCxvbHsNCiAgICAgICAg cGFkZGluZy1sZWZ0OiAyMHB4Ow0KICAgICAgICBsaXN0LXN0eWxlLXBvc2l0 aW9uOiBpbnNpZGU7DQogICAgfQ0KPC9zdHlsZT4NCjxkaXYgc3R5bGUgPSAn Zm9udC1mYW1pbHk6SGVsdmV0aWNhLEhlbHZldGljYSzlvq7ova/pm4Xpu5Es IOWui+S9kzsgbGluZS1oZWlnaHQ6MS42Oyc+DQogICAgPGRpdiA+PC9kaXY+ PGRpdj4KICAgIDxkaXY+CiAgICAgICAgPHNwYW4+CiAgICAgICAgICAgIDxi cj4KICAgICAgICA8L3NwYW4+CiAgICA8L2Rpdj48ZGl2PjxkaXYgc3R5bGU9 ImZvbnQtZmFtaWx5OiBIZWx2ZXRpY2EsIEhlbHZldGljYSwg5b6u6L2v6ZuF 6buRLCDlrovkvZM7Ij48c3BhbiBzdHlsZT0iZm9udC1mYW1pbHk6IEhlbHZl dGljYSwg5b6u6L2v6ZuF6buRLCDlrovkvZM7Ij5MLiBQLiBYaW4gKE5BT0Mp 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GCN 28671 table
GRB_name GRB201017A
GCN_number 28671
Detection_method Swift-XRT Det
ra 36.6201°
decl 66.6788°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28671 SUBJECT: GRB 201017A: Enhanced Swift-XRT position DATE: 20/10/17 14:08:46 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 1488 s of XRT Photon Counting mode data and 3 UVOT images for GRB 201017A, 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 = 36.62010, +66.67877 which is equivalent to: RA (J2000): 02h 26m 28.82s Dec (J2000): +66d 40' 43.6" with an uncertainty of 2.6 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 28672 table
GRB_name GRB201017A
GCN_number 28672
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 28672 SUBJECT: GRB 201017A: Xinglong TNT upper limit DATE: 20/10/17 14:11:41 GMT FROM: Liping Xin at NAOC, SVOM L. P. Xin (NAOC), X. F. Wang(THU), Y. L. Qiu(NAOC), J. Y. Wei(NAOC), J. Wang(GXU), L. H. Li (NAOC), C. Wu(NAOC), E. W. Liang(GXU), X. H. Han (NAOC)and J. S. Deng(NAOC)report: We began to observe GRB 201017A ( A. D'Ai et al., GCN 28666) with Xinglong TNT telescope, China, at 11:10:24.8 (UT), 17th. Otc. 2020, about 84 min after the burst, 10 x 300 sec R band images were obtained. No any new source was detected in the XRT errorbox ( A. D'Ai et al., GCN 28666) down to the limit magnitude of 19.5 mag in R band for any single image. The brightness is calibrated to the USNO B1.0 R2 mag. More analysis are still continuing. We acknowledge the excellent support from Xinglong staff Sen Liu. The message may be cited.
GCN 28675 table
GRB_name GRB201017A
GCN_number 28675
Detection_method Fermi GBM Det
t_trigger 9:46:32.630 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 28675 SUBJECT: GRB 201017A: Fermi GBM detection DATE: 20/10/18 00:40:30 GMT FROM: Suraj Poolakkil at UAH S. Poolakkil (UAH), C. Meegan (UAH) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team: "At 09:46:32.63 UT on 17 October 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 201017A(trigger 624620797 / 201017407), which was also detected by the Swift/BAT (A. D'Ai et al. 2020, GCN 28666). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 98 degrees. The GBM light curve consists of a single peak followed by some extended emission with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-4.09 s to T0+5.12 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.20 +/- 0.17 and the cutoff energy, parameterized as Epeak, is 144 +/- 35 keV. The event fluence (10-1000 keV) in this time interval is (1.402 +/- 0.166)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.89 s in the 10-1000 keV band is 2.9 +/- 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 28678 table
GRB_name GRB201017A
GCN_number 28678
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 28678 SUBJECT: GRB 201017A: Swift-XRT refined Analysis DATE: 20/10/18 10:03:03 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and A. D'Ai report on behalf of the Swift-XRT team: We have analysed 3.5 ks of XRT data for GRB 201017A (D'Ai et al. GCN Circ. 28666), from 112 s to 23.0 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. 28671). The light curve can be modelled with a power-law decay with a decay index of alpha=0.97 (+0.10, -0.08). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+0.5, -0.4). The best-fitting absorption column is 1.6 (+0.6, -0.5) x 10^22 cm^-2, in excess of the Galactic value of 5.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.6 (+0.6, -0.5) x 10^22 cm^-2 Galactic foreground: 5.7 x 10^21 cm^-2 Excess significance: 3.6 sigma Photon index: 2.3 (+0.5, -0.4) If the light curve continues to decay with a power-law decay index of 0.97, the count rate at T+24 hours will be 1.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.3 x 10^-14 (2.3 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/01000613. This circular is an official product of the Swift-XRT team.
GCN 28679 table
GRB_name GRB201017A
GCN_number 28679
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 28679 SUBJECT: GRB 201017A: Assy and Mondy optical observations, possible afterglow detection DATE: 20/10/18 10:36:43 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), V. Kim (AFIF, Pulkovo Observatory), A. Pozanenko (IKI), E. Klunko (ISTP), M. Krugov (AFIF), N. Pankov (HSE), A. Volnova (IKI) report on behalf of IKI GRB FuN: We observed the filed of GRB 201017A (Fermi GBM Team, GCN 28665; D'Ai et al., GCN 28666; Poolakkil et al., GCN 28675) with AZT-33IK telescope of Mondy observatory in R-filter starting on Oct. 17 (UT) 14:56:22 and with AZT-20 telescope of Assy-Turgen observatory starting on Oct. 17 (UT) 14:15:45 in r' -filter. At the edge of enhanced Swift-XRT position (Goad et al., GCN 28671) we marginally detected the object which is absent in any Pan-STARRS images and PS1 catalog. Position of the object is (J2000) 02:26:28.31 +66:40:44.74 with uncertainty of 0.5" in each coordinate. Preliminary photometry of the afterglow candidate is following Date UT start t-T0 Filter Exp. OT Err. UL (3sigma) (mid, days) (s) 2020-10-17 14:15:45 0.2043 r'(AB) 50*60 22.9 0.3 23.2 (AZT-20) 2020-10-17 14:56:22 0.2362 R 30*120 n/d n/d 21.8 (AZT-33IK) The photometry is based on the nearby stars of PanSTARRS-PS1 catalog. RA DEC r 02:26:33.94915 +66:39:38.3372 16.1111 02:26:39.68479 +66:38:36.3089 17.4493
GCN 28682 table
GRB_name GRB201017A
GCN_number 28682
Detection_method Swift-BAT Det
ra 36.5870°
decl 66.6630°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28682 SUBJECT: GRB 201017A: Swift-BAT refined analysis DATE: 20/10/18 22:26:32 GMT FROM: Hans Krimm at NSF/NASA-GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+823 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201017A (trigger #1000613) D'Ai, et al., GCN Circ. 28666). The BAT ground-calculated position is RA, Dec = 36.587, 66.663 deg which is RA(J2000) = 02h 26m 20.9s Dec(J2000) = +66d 39' 45.7" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%. The mask-weighted light curve shows a single, symmetrical main peak from roughly T-5 sec to T+5 sec, peaking at T+1 sec, followed by weaker emission out to T+20 sec. T90 (15-350 keV) is 22.08 +- 6.25 sec (estimated error including systematics). The time-averaged spectrum from T-2.77 to T+23.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.25. The fluence in the 15-150 keV band is 9.0 +- 1.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.87 sec in the 15-150 keV band is 1.8 +- 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/1000613/BA/
GCN 28684 table
GRB_name GRB201017A
GCN_number 28684
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 28684 SUBJECT: GRB 201017A: MITSuME Akeno optical upper limits DATE: 20/10/19 14:13:28 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 201017A (The Fermi GBM team, GCN #28665, A. D'Ai et al., GCN #28666, V. Lipunov et al., GCN #28667, L. P. Xin et al., GCN #28672, S. Belkin et al., GCN #28679) 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 started at 2020-10-17 12:53:15 UT.(186 min after trigger) Since some images were heavily affected by bad weather, we stacked the images with good conditions. We did not find any new point sources within the enhanced Swift/XRT circle (M. R. Goad et al., GCN #28671) in all three bands. We obtained the 5-sigma limits as follows T0+[min] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 296 17:53:37 9480 g'>20.0,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., accepted for publication in PASJ, https://arxiv.org/abs/2008.11486; https://github.com/MNiwano/Eclaire).
GCN 28691 table
GRB_name GRB201017A
GCN_number 28691
Detection_method Optical
ra 36.6201°
decl 66.6788°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28691 SUBJECT: GRB 201017A: GROWTH-India optical upper limit DATE: 20/10/19 15:40:46 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar (IITB), U. Stanzin(IAO), V. Bhalerao(IITB), G. C. Anupama(IIA), S. Barway(IIA), report on behalf of the GROWTH-India collaboration: We observed GRB 201017A reported by Fermi GBM Team (GCN #28665) and Swift-BAT (A. D'Ai et al., GCN #28666; also see:- V. Lipunov et al., GCN #28667; M.R. Goad et al., GCN #28671; L. P. Xin et al., GCN #28672; S. Poolakkil et al., GCN #28675; J.A. Kennea et al., GCN #28678; S. Belkin et al., GCN #28679) with 0.7m GROWTH-India telescope. The field was observed in the SDSS r’ filter starting at 2020-10-17T12:54:58.41 UT i.e. ~3.13 hrs after the event detection by Swift-BAT. We did not find any new source in the stacked image of 10*300 sec exposure, within an uncertainty region of 2.6 arcsec around RA (J2000): 02h 26m 28.82s, Dec (J2000): +66d 40' 43.6" (GCN 28671) up to r’ > 21.01 mag (5-sigma), calibrated against PanSTARRs PS1 data release, (Flewelling et al., 2018). Assuming a typical power-law decay, this upper limit is consistent with the r’=22.9 mag detection by Belkin et al (GCN # 28679). 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 28692 table
GRB_name GRB201017A
GCN_number 28692
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 28692 SUBJECT: GRB 201017A: SAO RAS optical observations DATE: 20/10/19 17:43:25 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin, V. N. Aitov (SAO RAS) on behalf of GRB follow-up team report. We observed the field of GRB 201017A (Fermi GBM team, GCN #28665; D'Ai et al., GCN #28666; Poolakkil et al., GCN #28675) with the 1-m telescope of SAO RAS, Zeiss-1000 + Multi-Mode Photometer-Polarimeter. We obtained 11 x 300 sec. images in Rc band on October 17, 22:01:08--23:24:20 UT, t_mid - T0 = 0.5390 days. We did not detect possible OT reported by Belkin et al. (GCN #28679) or any sources within the XRT error circle (Goad et al., GCN #28671) down to a limiting magnitude of 23.0.
GCN 28693 table
GRB_name GRB201017A
GCN_number 28693
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 28693 SUBJECT: GRB 201017A iTelescope observation DATE: 20/10/19 23:35:52 GMT FROM: Takanori Sakamoto at AGU K. Hasuda, M. Nakamura, T. Sakamoto (AGU) We observed the field of GRB 201017A detected by Swift (D'Ai et al., GCN Circ. 28666) with the iTelescope.Net (http://www.itelescope.net) T5 (Takahashi Epsilon 250mm) telescope located at the New Mexico Skies Observatory (NM, USA). 10 images of 60 sec exposures were taken in the Red filter starting from October 17 on 10:06:37 (UT) about 20.1 min. after the trigger and stopped on 10:20:44 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the XRT position (Goad et al., GCN Circ. 28671). The estimated five sigma upper limit of the combined image (total exposure of 600 sec) is ~17.3 using the USNO-B1 catalog.