Gamma-ray Burst 220606B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 06 Jun 22 01:04:16 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     676170213
GRB_RA:           30.700d {+02h 02m 48s} (J2000),
                  30.871d {+02h 03m 29s} (current),
                  30.318d {+02h 01m 16s} (1950)
GRB_DEC:         -61.210d {-61d 12' 35"} (J2000),
                 -61.103d {-61d 06' 09"} (current),
                 -61.450d {-61d 26' 58"} (1950)
GRB_ERROR:       28.73 [deg radius, statistical only]
DATA_SIGNIF:     5.70 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        19736 TJD;   157 DOY;   22/06/06
GRB_TIME:        3808.68 SOD {01:03:28.68} UT
GRB_PHI:         254.00 [deg]
GRB_THETA:        32.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        74.09d {+04h 56m 22s}  +22.63d {+22d 37' 48"}
SUN_DIST:         90.68 [deg]   Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN:      151.29d {+10h 05m 11s}  +17.37d {+17d 22' 19"}
MOON_DIST:       119.67 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      288.44,-53.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      343.45,-64.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_lc_medres34_bn220606044.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_676170213.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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:     Mon 06 Jun 22 01:03:58 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      43
TRIGGER_NUM:     676170213
GRB_RA:           35.350d {+02h 21m 24s} (J2000),
                  35.493d {+02h 21m 58s} (current),
                  35.031d {+02h 20m 07s} (1950)
GRB_DEC:         -63.350d {-63d 21' 00"} (J2000),
                 -63.248d {-63d 14' 53"} (current),
                 -63.578d {-63d 34' 38"} (1950)
GRB_ERROR:       19.40 [deg radius, statistical plus systematic]
GRB_INTEN:       134 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        19736 TJD;   157 DOY;   22/06/06
GRB_TIME:        3808.68 SOD {01:03:28.68} UT
GRB_PHI:         255.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.32
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,0,1, 0,0,0, 0,0,
SUN_POSTN:        74.09d {+04h 56m 22s}  +22.63d {+22d 37' 47"}
SUN_DIST:         91.08 [deg]   Sun_angle= 2.6 [hr] (West of Sun)
MOON_POSTN:      151.29d {+10h 05m 10s}  +17.37d {+17d 22' 23"}
MOON_DIST:       116.97 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      287.13,-50.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      342.21,-67.40 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_lc_medres34_bn220606044.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 118.60,15.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 06 Jun 22 01:12:55 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     676170213
GRB_RA:           22.440d {+01h 29m 46s} (J2000),
                  22.670d {+01h 30m 41s} (current),
                  21.925d {+01h 27m 42s} (1950)
GRB_DEC:         -49.960d {-49d 57' 35"} (J2000),
                 -49.845d {-49d 50' 40"} (current),
                 -50.218d {-50d 13' 03"} (1950)
GRB_ERROR:       12.09 [deg radius, statistical only]
GRB_DATE:        19736 TJD;   157 DOY;   22/06/06
GRB_TIME:        3808.68 SOD {01:03:28.68} UT
GRB_PHI:         258.00 [deg]
GRB_THETA:        20.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        74.10d {+04h 56m 23s}  +22.63d {+22d 37' 50"}
SUN_DIST:         85.58 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      151.37d {+10h 05m 28s}  +17.35d {+17d 20' 45"}
MOON_DIST:       127.78 [deg]
MOON_ILLUM:      35 [%]
GAL_COORDS:      287.66,-66.02 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.41,-53.14 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_lc_medres34_bn220606044.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_locplot_all_bn220606044.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:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Short GRB.

GCN Circular #32165
The Fermi GBM team reports the detection of a likely SHORT GRB
At 01:03:28 UT on 6 Jun 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220606B (trigger 676170213.675398 / 220606044).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 22.4, Dec = -50.0 (J2000 degrees, equivalent to J2000 01h 29m, -50d 00'), with a statistical uncertainty of 12.1 degrees.
The angle from the Fermi LAT boresight is 20.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_skymap_all_bn220606044.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/bn220606044/quicklook/glg_healpix_all_bn220606044.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220606044/quicklook/glg_lc_medres34_bn220606044.gif
GCN Circular #32166
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 220606B ( Fermi GBM team, GCN 32165) errorbox 720 sec after notice time and 754 sec after trigger time at 2022-06-06 01:16:03 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 65 deg. The sun altitude is -53.7 deg.
The galactic latitude b = -66 deg., longitude l = 287 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1997640
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     785 | 2022-06-06 01:16:03 |         MASTER-SAAO | (01h 27m 52.53s , -50d 19m 46.2s) |   C |    60 | 19.0 |        
     875 | 2022-06-06 01:17:34 |         MASTER-SAAO | (01h 40m 26.17s , -50d 17m 58.4s) |   C |    60 | 19.2 |        
     957 | 2022-06-06 01:18:55 |         MASTER-SAAO | (01h 24m 27.36s , -48d 24m 22.5s) |   C |    60 | 19.3 |        
    1265 | 2022-06-06 01:24:03 |         MASTER-SAAO | (01h 36m 29.45s , -48d 26m 09.1s) |   C |    60 | 19.3 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #32167
Aaron Tohuvavohu (U Toronto), James DeLaunay (UAlabama), Gayathri Raman (PSU), Jamie A. Kennea (PSU), report:
Swift/BAT did not localize GRB 220606B onboard (T0: 2022-06-06T01:03:28 UTC, Fermi/GBM GCN 32165).
The Fermi 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 BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu, arXiv:2111.01769), detects the burst in a 0.512 s analysis time bin with a sqrt(TS) of 10.7. The duration of the burst as seen by BAT is less than 0.5 s.
A candidate arcminute localization is found with DeltaLLHOut of 11.3 and a DeltaLLHPeak of 3.1. For this reason we can confidently claim detection, and preference for an in FOV origin, but the best fit arcmin localization is not strongly preferred over other positions.
See Section 9.1 and Figure 20 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.
The BAT position is RA, Dec = 28.474, -54.471 deg which is
```
   RA(J2000)  = 01h 53m 53.76s
   Dec(J2000) = -54d 28′ 15.6″
```
with an estimated uncertainty of 5 arcmin.
This position is consistent with the Fermi/GBM localization (GCN 32165).
XRT and UVOT follow-up has been requested. 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 #32168
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT-GUANO GRB 220606B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021504
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 #32170
The coordinates for GRB 220606B reported in GCN 32167 were transposed in the declination, and therefore incorrect.
The correct coordinates of the GRB localization candidate are: RA, Dec = 28.474, -54.741 deg which is
```
   RA(J2000)  = 01h 53m 53.76s
   Dec(J2000) = -54d 44′ 27.6″
```
with an estimated uncertainty of 5 arcmin.
The Swift XRT/UVOT ToO followup is at the correct position. Sincere apologies for the transcription error.
GCN Circular #32173
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), A. Breeveld (UCL-MSSL) report on behalf of the Swift team:
Swift-XRT has performed follow-up observations of the Swift/BAT-GUANO-detected burst GRB 220606B (Tohuvavohu et al., GCN Circ. 32167), collecting 4.9 ks of Photon Counting (PC) mode data between T0+44.9 ks and T0+68.8 ks.
No credible X-ray afterglow candidate has been detected within the BAT-GUANO error circle (Tohuvavohu, GCN Circ. 32170) down to a 0.3 - 10 keV count-rate upper limit of ~ 2e-3 ct/s (3sigma c.l.).
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/00021504.
Swift-UVOT began settled observations 45.1 ks after the trigger. No optical afterglow consistent with the BAT-GUANO position is detected. The 3.9 ks exposure in the white filter gives an upper limit of >21.9 mag.
This circular is an official product of the Swift team.
GCN Circular #32174
B. Hristov (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 01:03:28.68 UT on 06 June 2022, the Fermi Gamma-Ray Burst Monitor
(GBM) triggered and located GRB 220606B (trigger 676170213 / 220606044),
which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2022,
GCN 32167).
The Fermi GBM Final Real-time Localization (GCN 32165) is consistent
with the GUANO position.
The GBM light curve shows a single peak with a duration (T90) of about
0.9 +/- 0.4 s (50-300 keV).
The time-averaged spectrum from T0-0.256 s to T0+0.768 s is best fit by
a simple power law with index = -1.28 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(2.9 +/- 0.4)E-7 erg/cm^2. The 0.64-sec peak photon flux measured
starting from T0-0.064 s in the 10-1000 keV band is
2.8 +/- 0.9 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 #32177
B. O'Connor (UMD/GWU), E. Troja (Tor Vergata), S. Dichiara (PSU), on behalf of a larger collaboration:
We performed target of opportunity observations of the short GRB 220606B (Fermi GBM Team GCN 32165, Tohuvavohu et al. GCN 32167) with the Gemini Multi Object Spectrograph (GMOS) mounted on the Gemini-South telescope. We obtained imaging in r-band and z-band for 630 s in each filter starting at ~1.4 d post-trigger. The GMOS field of view covers the central ~45% of the BAT error circle (Tohuvavohu et al. GCN 32170). We note that this includes a bright nearby galaxy with an estimated distance of 225 Mpc (GLADE catalog; Dalya et al. 2016).
In comparison to the Dark Energy Survey DR2 catalog (Abbott et al. 2021), we do not identify any uncatalogued sources to a depth r>25 AB mag and z>24.5 AB mag. This is in agreement with the previously reported limit from Swift/UVOT (Evans et al. GCNs 32168 and 32173).
Our observations are sensitive to an AT2017gfo-like kilonova at 225 Mpc. Therefore, either GRB 220606B is not physically associated with the nearby galaxy or its kilonova is ~25 times fainter than AT2017gfo at 1.4 d post-merger.
We thank the staff of the Gemini Observatory, in particular Steve Margheim and Joan Font-Serra, for rapid scheduling of these observations.

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Jochen Greiner, last update: 08-Jun-2022 [Disclaimer]