Gamma-ray Burst 210622A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Tue 22 Jun 21 01:33:02 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      44
  TRIGGER_NUM:     646018360
  GRB_RA:          240.983d {+16h 03m 56s} (J2000),
                   241.255d {+16h 05m 01s} (current),
                   240.351d {+16h 01m 24s} (1950)
  GRB_DEC:          +1.917d {+01d 55' 00"} (J2000),
                    +1.859d {+01d 51' 32"} (current),
                    +2.053d {+02d 03' 11"} (1950)
  GRB_ERROR:       18.80 [deg radius, statistical plus systematic]
  GRB_INTEN:       218 [cnts/sec]
  DATA_SIGNIF:     10.50 [sigma]
  INTEG_TIME:      1.024 [sec]
  GRB_DATE:        19387 TJD;   173 DOY;   21/06/22
  GRB_TIME:        5555.94 SOD {01:32:35.94} UT
  GRB_PHI:         140.00 [deg]
  GRB_THETA:        70.00 [deg]
  DATA_TIME_SCALE: 1.0240 [sec]
  HARD_RATIO:      0.21
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      95%  GRB
  2nd_MOST_LIKELY:   2%  Cyg X-1
  SUN_POSTN:        90.96d {+06h 03m 50s}  +23.43d {+23d 25' 59"}
  SUN_DIST:        141.60 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
  MOON_POSTN:      231.01d {+15h 24m 03s}  -17.12d {-17d 07' 04"}
  MOON_DIST:        21.50 [deg]
  MOON_ILLUM:      89 [%]
  GAL_COORDS:       12.69, 37.52 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      238.42, 22.23 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_lc_medres34_bn210622064.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Tue 22 Jun 21 01:33:18 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      57
  TRIGGER_NUM:     646018360
  GRB_RA:          238.550d {+15h 54m 12s} (J2000),
                   238.853d {+15h 55m 25s} (current),
                   237.845d {+15h 51m 23s} (1950)
  GRB_DEC:         -15.260d {-15d 15' 35"} (J2000),
                   -15.322d {-15d 19' 19"} (current),
                   -15.113d {-15d 06' 47"} (1950)
  GRB_ERROR:       7.30 [deg radius, statistical only]
  DATA_SIGNIF:     13.40 [sigma]
  DATA_INTERVAL:   2.048 [sec]
  GRB_DATE:        19387 TJD;   173 DOY;   21/06/22
  GRB_TIME:        5555.94 SOD {01:32:35.94} UT
  GRB_PHI:         149.00 [deg]
  GRB_THETA:        85.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   4173 (Gnd S/W Version number)
  SUN_POSTN:        90.96d {+06h 03m 50s}  +23.43d {+23d 25' 59"}
  SUN_DIST:        148.72 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
  MOON_POSTN:      231.02d {+15h 24m 04s}  -17.12d {-17d 07' 08"}
  MOON_DIST:         7.73 [deg]
  MOON_ILLUM:      89 [%]
  GAL_COORDS:      354.82, 28.67 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      239.65,  4.93 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_lc_medres34_bn210622064.gif
  POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_646018360.fits
  COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
  COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Tue 22 Jun 21 01:41:56 UT
  NOTICE_TYPE:     Fermi-GBM Final Position
  RECORD_NUM:      0
  TRIGGER_NUM:     646018360
  GRB_RA:          242.050d {+16h 08m 12s} (J2000),
                   242.352d {+16h 09m 24s} (current),
                   241.348d {+16h 05m 24s} (1950)
  GRB_DEC:         -14.100d {-14d 05' 59"} (J2000),
                   -14.156d {-14d 09' 20"} (current),
                   -13.968d {-13d 58' 04"} (1950)
  GRB_ERROR:       6.06 [deg radius, statistical only]
  GRB_DATE:        19387 TJD;   173 DOY;   21/06/22
  GRB_TIME:        5555.94 SOD {01:32:35.94} UT
  GRB_PHI:         151.00 [deg]
  GRB_THETA:        82.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   41731 (Gnd S/W Version number)
  SUN_POSTN:        90.97d {+06h 03m 52s}  +23.43d {+23d 25' 58"}
  SUN_DIST:        151.43 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
  MOON_POSTN:      231.11d {+15h 24m 25s}  -17.15d {-17d 08' 55"}
  MOON_DIST:        11.23 [deg]
  MOON_ILLUM:      90 [%]
  GAL_COORDS:      358.36, 26.94 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      242.76,  6.74 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_lc_medres34_bn210622064.gif
  LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_locplot_all_bn210622064.png
  COMMENTS:        Fermi-GBM Final Position.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
  COMMENTS:        This notice was generated completely by automated pipeline processing.  
  COMMENTS:        This is likely a Short GRB.  
  

• GCN Circular #30297
  The Fermi GBM team reports the detection of a likely SHORT GRB
  At 01:32:35 UT on 22 Jun 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210622A (trigger 646018360.939998 / 210622064).
  The on-ground calculated location, using the Fermi GBM trigger data, is RA = 242.1, Dec = -14.1 (J2000 degrees, equivalent to J2000 16h 08m, -14d 05'), with a statistical uncertainty of 6.1 degrees.
  The angle from the Fermi LAT boresight is 82.0 degrees.
  The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_skymap_all_bn210622064.png
  The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_healpix_all_bn210622064.fit
  The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210622064/quicklook/glg_lc_medres34_bn210622064.gif
  
• GCN Circular #30302
  James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Gayathri Raman (PSU) report:
  Swift/BAT did not trigger on GRB 210622A (T0: 2021-06-22 01:32:35.9 UTC, Fermi/GBM GCN 30297).
  The Fermi/GBM notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
  Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
  The burst is detected in BAT with a duration of at least 25 seconds. We note this is different from the prompt GBM classification as ‘likely short’. The burst morphology consists of a first bright, short, hard, peak followed by longer emission with weaker flares.
  With a maximum likelihood analysis (DeLaunay et al. 2021, in prep.) on the event-mode data we detect a location for the burst with a square root of the test statistic, sqrt(TS), of 18.8. The sqrt(TS) behaves similarly to SNR. Using the normal BAT imaging technique, we find the same location for the GRB with an SNR of 8.1.
  The BAT position is RA, Dec = 233.117, -26.213 deg which is

     RA(J2000)  = 15h 32m 28.10s
     Dec(J2000) =  -26d 12′ 47.5″
  

  with an estimated uncertainty of 2.5 arcmin.
  This position is consistent with the Ferm/GBM localization (GCN 30297).
  XRT and UVOT follow-up has been requested. Prompt followup by Swift is delayed due to visibility constraints. Results of follow-up observations will be reported in future circulars.
  GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
  A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
• GCN Circular #30306
  S. Lesage (UAH) and R. Hamburg (UAH) report on behalf of the Fermi GBM Team:
  "At 01:32:35.94 UT on 22 June 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210622A (trigger 646018360 / 210622064) which was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2021, GCN 30302) The Fermi GBM Final Real-time Localization (GCN 30297) is consistent with the Swift position.
  The angle from the Fermi LAT boresight at the GBM trigger time is 97 degrees.
  The GBM light curve consists of a single peak followed by some extended emission with a duration (T90) of about 40 s (50-300 keV). The time-averaged spectrum from T0 s to T0+39.4 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.8 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 376 +/- 98 keV.
  The event fluence (10-1000 keV) in this time interval is (1.01 +/- 0.12)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.128 s in the 10-1000 keV band is 3.1 +/- 0.2 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 Circular #30307
  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) started inspect of the Fermi GRB 210622B ( Fermi GBM team, GCN 30298) errorbox 43469 sec after notice time and 43496 sec after trigger time at 2021-06-22 22:37:57 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 56 deg. The sun altitude is -12.0 deg.
  The galactic latitude b = 15 deg., longitude l = 237 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1642370
  We obtain a following upper limits.

  Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
  
     43526 | 2021-06-22 22:37:57 |         MASTER-OAFA | (08h 14m 05.24s , -14d 37m 45.1s) |   C |    60 | 17.4 |        
     43605 | 2021-06-22 22:39:17 |         MASTER-OAFA | (08h 22m 14.70s , -14d 38m 34.0s) |   C |    60 | 17.4 |        
     43685 | 2021-06-22 22:40:36 |         MASTER-OAFA | (08h 25m 46.77s , -12d 42m 57.2s) |   C |    60 | 17.6 |        
     43767 | 2021-06-22 22:41:58 |         MASTER-OAFA | (08h 33m 57.71s , -12d 44m 12.9s) |   C |    60 | 17.8 |        
     43847 | 2021-06-22 22:43:18 |         MASTER-OAFA | (08h 10m 11.95s , -12d 43m 46.8s) |   C |    60 | 17.8 |        
     43926 | 2021-06-22 22:44:37 |         MASTER-OAFA | (08h 18m 21.69s , -12d 42m 35.5s) |   C |    60 | 17.8 |        
     44006 | 2021-06-22 22:45:57 |         MASTER-OAFA | (08h 29m 39.40s , -14d 38m 20.6s) |   C |    60 | 17.6 |        
     44085 | 2021-06-22 22:47:17 |         MASTER-OAFA | (08h 38m 00.16s , -14d 38m 01.8s) |   C |    60 | 17.8 |        
     44165 | 2021-06-22 22:48:36 |         MASTER-OAFA | (08h 18m 29.20s , -16d 32m 12.2s) |   C |    60 | 17.7 |        
     44244 | 2021-06-22 22:49:56 |         MASTER-OAFA | (08h 26m 51.96s , -16d 30m 43.5s) |   C |    60 | 17.6 |        
     44783 | 2021-06-22 22:58:54 |         MASTER-OAFA | (08h 14m 00.60s , -14d 36m 33.1s) |   C |    60 | 17.8 |        
     44862 | 2021-06-22 23:00:14 |         MASTER-OAFA | (08h 22m 20.98s , -14d 37m 22.9s) |   C |    60 | 17.7 |        
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #30310
  P. A. Evans (U. Leicester) reports on behalf of the Swift team:
  Swift has initiated a ToO observation of the Swift/BAT-GUANO GRB 210622A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021452
  Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Swift/BAT-GUANO event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
  Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
  This circular is an official product of the Swift-XRT team.
• GCN Circular #30317
  A.P. Beardmore (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (PSU), D.N. Burrows (PSU), J. D. Gropp (PSU), J.P. Osborne (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 Swift/BAT-GUANO-detected burst GRB 210622A (James DeLaunay et al. GCN Circ. 30302), collecting 4.5 ks of Photon Counting (PC) mode data between T0+171.2 ks and T0+221.6 ks.
  No X-ray sources have been detected consistent with being within 246 arcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the field is 0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 1.0e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
  An uncatalogued was detected, however this was too far from the GRB position to be the afterglow.
  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/00021452.
  This circular is an official product of the Swift-XRT team.