//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32209 SUBJECT: GRB 220617A: Fermi GBM Final Real-time Localization DATE: 22/06/17 18:41:43 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 18:31:12 UT on 17 Jun 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220617A (trigger 677183477.902462 / 220617772). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 155.8, Dec = 21.2 (J2000 degrees, equivalent to J2000 10h 23m, 21d 11'), with a statistical uncertainty of 2.7 degrees. The angle from the Fermi LAT boresight is 41.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220617772/quicklook/glg_skymap_all_bn220617772.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220617772/quicklook/glg_healpix_all_bn220617772.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220617772/quicklook/glg_lc_medres34_bn220617772.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32210 SUBJECT: Fermi GRB 220617A: Global MASTER-Net observations report DATE: 22/06/17 19:30:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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 (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (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) started inspect of the Fermi GRB 220617A ( Fermi GBM team, GCN 32209) errorbox 565 sec after notice time and 600 sec after trigger time at 2022-06-17 18:41:13 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 72 deg. The sun altitude is -37.2 deg. The galactic latitude b = 56 deg., longitude l = 216 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2008774 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 661 | 2022-06-17 18:41:13 | MASTER-SAAO | (10h 22m 17.52s , +21d 18m 28.6s) | C | 120 | 16.9 | 826 | 2022-06-17 18:41:13 | MASTER-SAAO | (10h 22m 18.15s , +21d 18m 33.0s) | C | 450 | 17.8 | Coadd 843 | 2022-06-17 18:44:01 | MASTER-SAAO | (10h 22m 23.41s , +21d 20m 08.9s) | C | 150 | 17.2 | 1040 | 2022-06-17 18:47:02 | MASTER-SAAO | (10h 22m 18.64s , +21d 19m 26.5s) | C | 180 | 17.1 | 1914 | 2022-06-17 19:02:36 | MASTER-SAAO | (10h 18m 16.82s , +22d 17m 11.7s) | C | 60 | 15.8 | 2005 | 2022-06-17 19:04:08 | MASTER-SAAO | (10h 26m 56.39s , +22d 16m 07.7s) | C | 60 | 16.2 | 2093 | 2022-06-17 19:05:35 | MASTER-SAAO | (10h 10m 34.70s , +20d 21m 52.6s) | C | 60 | 14.0 | 2184 | 2022-06-17 19:07:06 | MASTER-SAAO | (10h 18m 58.19s , +20d 23m 01.3s) | C | 60 | 16.0 | 2884 | 2022-06-17 19:18:46 | MASTER-SAAO | (10h 26m 42.09s , +20d 21m 46.5s) | C | 60 | 14.8 | 2976 | 2022-06-17 19:20:18 | MASTER-SAAO | (10h 35m 11.11s , +20d 23m 25.2s) | C | 60 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32212 SUBJECT: GRB 220617A: Fermi-LAT detection DATE: 22/06/18 01:57:08 GMT FROM: Niccolo Di Lalla at Stanford U N. Di Lalla (Stanford Univ.), M. Arimoto (Kanazawa Univ.), M. Axelsson (KTH & Stockholm Univ.) and G. Principe (University and INFN Trieste) report on behalf of the Fermi-LAT team: On June 17, 2022, Fermi-LAT detected high-energy emission from GRB 220617A, which was also detected by Fermi-GBM (trigger 677183477 / 220617772, GCN 32209). The best LAT on-ground location is found to be RA, Dec = 156.96, 15.53 (degrees, J2000) with an error radius of 0.09 deg (90 % containment, statistical error only). This was 46 deg from the LAT boresight at the time of the GBM trigger: T0 = 18:31:12 UT. The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-200 s after the GBM trigger is (4.9 +/- 0.8)E-05 ph/cm2/s. The estimated photon index above 100 MeV is -1.9 +/- 0.1. The highest-energy photon is a 8.2 GeV event which is observed 0.9 seconds after the GBM trigger. A Swift ToO has been approved for this burst. The Fermi-LAT point of contact for this burst is Giacomo Principe (giacomo.principe@ts.infn.it ). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32215 SUBJECT: GRB 220617A: Swift-XRT observations DATE: 22/06/18 10:41:51 GMT FROM: Phil Evans at U of Leicester K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 220617A (Di Lalla et al. GCN Circ. 32212), collecting 4.9 ks of Photon Counting (PC) mode data between T0+23.9 ks and T0+37.1 ks. Five uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below. Please note: due to an error, the original GCN announcing these Swift observations (GCN 32211) referred to "GRB 220617B", whereas the observations were of GRB 220617A. Source 1: RA (J2000.0): 157.1531 = 10:28:36.74 Dec (J2000.0): +15.4493 = +15:26:57.6 Error: 6.4 arcsec (radius, 90% conf.) Count-rate: (2.7 [+1.5, -1.1])e-3 ct s^-1 Distance: 730 arcsec from Fermi/LAT position. Flux: (5.5 [+3.0, -2.2])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 156.9298 = 10:27:43.15 Dec (J2000.0): +15.4059 = +15:24:21.1 Error: 6.4 arcsec (radius, 90% conf.) Count-rate: (1.45 [+0.92, -0.65])e-3 ct s^-1 Distance: 458 arcsec from Fermi/LAT position. Source 3: RA (J2000.0): 157.0400 = 10:28:9.60 Dec (J2000.0): +15.4886 = +15:29:19.1 Error: 6.4 arcsec (radius, 90% conf.) Count-rate: (1.67 [+0.91, -0.69])e-3 ct s^-1 Distance: 314 arcsec from Fermi/LAT position. Source 4: RA (J2000.0): 156.9896 = 10:27:57.50 Dec (J2000.0): +15.4454 = +15:26:43.4 Error: 5.7 arcsec (radius, 90% conf.) Count-rate: (1.75 [+0.93, -0.70])e-3 ct s^-1 Distance: 321 arcsec from Fermi/LAT position. Source 5: RA (J2000.0): 156.8566 = 10:27:25.60 Dec (J2000.0): +15.3577 = +15:21:27.8 Error: 6.3 arcsec (radius, 90% conf.) Count-rate: 0.0114 [+0.0046, -0.0036] ct s^-1 Distance: 716 arcsec from Fermi/LAT position. 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/00021505. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32220 SUBJECT: IPN triangulation of GRB 220617A (short) DATE: 22/06/18 18:02:34 GMT FROM: Anna Ridnaia at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars-Odyssey team, A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The short-duration GRB 220617A (Fermi-GBM detection: Fermi GBM Team, GCN Circ 32209; Fermi-LAT detection: Di Lalla et al., GCN Circ 32212) has been detected by Fermi (GBM trigger 677183477), INTEGRAL (SPI-ACS), Konus-Wind, and Mars-Odyssey (HEND), so far, at about 66669 s UT (18:31:09). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 156.882 (10h 27m 32s) +15.600 (+15d 36' 01") Corners: 157.351 (10h 29m 24s) +16.445 (+16d 26' 41") 157.423 (10h 29m 41s) +16.807 (+16d 48' 25") 156.369 (10h 25m 29s) +14.606 (+14d 36' 21") 156.247 (10h 24m 59s) +14.082 (+14d 04' 54") --------------------------------------------- The error box area is 867 sq. arcmin, and its maximum dimension is 2.9 deg (the minimum one is 5.8 arcmin). The Sun distance was 66 deg. This box may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220617_T66669/IPN The Fermi-LAT localization was covered by Swift ToO (GCN Circ 32215) but none of the X-ray sources detected are inside the box. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32224 SUBJECT: GRB 220617A: Fermi GBM observation DATE: 22/06/19 01:54:39 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) reports on behalf of the Fermi GBM Team: "At 18:31:12.89 UT on 17 June 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220617A (trigger 677183477 / 220617772). which was also detected by the Fermi-LAT (N. Di Lalla et al. 2022, GCN 32212). The Fermi GBM Final Real-time Localization (GCN 32209) is consistent with the LAT position. The GBM light curve consists of a single pulse with a duration (T90) of about 0.7 s (50-300 keV). The time-averaged spectrum from T0-0.1 s to T0+0.5 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.7 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 2.3 +/- 0.3 MeV. The event fluence (10-1000 keV) in this time interval is (2.3 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.2 s in the 10-1000 keV band is 10 +/- 1 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/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32227 SUBJECT: GRB 220617A: TNG optical observations DATE: 22/06/19 12:17:15 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo (INAF-OAB), S. Piranomonte (INAF-OAR), S. Campana (INAF-OAB), V. D'Elia (ASI/SSDC), L. Di Fabrizio, A. Garcia De Gurtubai Escudero (INAF-TNG) on behalf of the CIBO collaboration report: We observed the field of the short GRB 220617A (Fermi-GBM detection: Fermi GBM Team, GCN Circ 32209; Fermi-LAT detection: Di Lalla et al., GCN Circ 32212; IPN detection: Kozyrev et al., GCN Circ. 32220) with the Italian 3.6m TNG telescope equipped with the optical camera DOLORES. A series of images were obtained with the r-sdss filter on 2022-06-18 from 21:22:18 UT to 22:09:26 UT (i.e. at a mid time of about 1.14 days after the burst). The pointing enabled to image the location of the Swift-XRT sources #3 and #4 (Page et al., GCN Circ. 32215), both consistent with the Fermi/LAT error circle. No clear afterglow candidate is detected within the error circles of XRT sources #3 and #4 down to a typical limiting magnitude of r ~ 24.5 (AB; calibrated against the SDSS catalogue). We note the presence of catalogued galaxies from the SDSS within the error circles of the XRT sources #3 and #4: XRT3 - SDSS J102809.40+152924.9 (photo-z = 0.102 +/- 0.031) - SDSS J102809.54+152915.8 (photo-z = 0.381 +/- 0.083) XRT4 - SDSS J102757.23+152645.6 (photo-z = 0.714 +/- 0.116) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32237 SUBJECT: Konus-Wind detection of GRB 220617A DATE: 22/06/20 16:16:01 GMT FROM: Anna Ridnaia at Ioffe Institute A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The short-duration GRB 220617A (Fermi-GBM detection: Fermi GBM Team, GCN Circ 32209; Wood, GCN Circ 32224; Fermi-LAT detection: Di Lalla et al., GCN Circ 32212; IPN triangulation: Kozyrev et al., GCN Circ 32220) triggered Konus-Wind at T0=66669.24 s UT (18:31:09.240). The burst light curve shows a multipeaked structure, which starts at ~T0-0.2 s and has a total duration of ~0.5 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220617_T66669/ As observed by Konus-Wind, the burst had a fluence of 6.53(-1.15,+1.34)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0-0.028 s, of 3.31(-1.27,+1.36)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = 0.02(-0.40,+0.57) and Ep = 1384(-341,+504) keV (chi2 = 34/40 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.0 (chi2 = 33/39 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.