Gamma-ray Burst 200605A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 05 Jun 20 18:18:06 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     613073867
GRB_RA:           88.617d {+05h 54m 28s} (J2000),
                  89.017d {+05h 56m 04s} (current),
                  87.637d {+05h 50m 33s} (1950)
GRB_DEC:         +50.633d {+50d 37' 60"} (J2000),
                 +50.636d {+50d 38' 08"} (current),
                 +50.624d {+50d 37' 27"} (1950)
GRB_ERROR:       6.68 [deg radius, statistical plus systematic]
GRB_INTEN:       2494 [cnts/sec]
DATA_SIGNIF:     37.20 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        19005 TJD;   157 DOY;   20/06/05
GRB_TIME:        65862.19 SOD {18:17:42.19} UT
GRB_PHI:         353.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  GRB
2nd_MOST_LIKELY:   7%  GRO_J0422_32
DETECTORS:       1,1,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        74.30d {+04h 57m 11s}  +22.65d {+22d 39' 04"}
SUN_DIST:         30.25 [deg]   Sun_angle= -1.0 [hr] (East of Sun)
MOON_POSTN:      253.92d {+16h 55m 40s}  -21.41d {-21d 24' 35"}
MOON_DIST:       148.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      161.93, 12.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.01, 27.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_lc_medres34_bn200605762.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 46.15,15.60 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 05 Jun 20 18:18:23 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     613073867
GRB_RA:           90.440d {+06h 01m 46s} (J2000),
                  90.836d {+06h 03m 21s} (current),
                  89.472d {+05h 57m 53s} (1950)
GRB_DEC:         +49.630d {+49d 37' 48"} (J2000),
                 +49.629d {+49d 37' 43"} (current),
                 +49.630d {+49d 37' 47"} (1950)
GRB_ERROR:       5.12 [deg radius, statistical only]
DATA_SIGNIF:     39.50 [sigma]
DATA_INTERVAL:   0.128 [sec]
GRB_DATE:        19005 TJD;   157 DOY;   20/06/05
GRB_TIME:        65862.19 SOD {18:17:42.19} UT
GRB_PHI:         355.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        74.30d {+04h 57m 12s}  +22.65d {+22d 39' 04"}
SUN_DIST:         29.95 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      253.92d {+16h 55m 40s}  -21.41d {-21d 24' 37"}
MOON_DIST:       148.77 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      163.40, 12.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       90.32, 26.19 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_lc_medres34_bn200605762.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_613073867.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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:     Fri 05 Jun 20 18:27:00 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     613073867
GRB_RA:           93.020d {+06h 12m 05s} (J2000),
                  93.436d {+06h 13m 45s} (current),
                  92.002d {+06h 08m 01s} (1950)
GRB_DEC:         +53.590d {+53d 35' 24"} (J2000),
                 +53.584d {+53d 35' 01"} (current),
                 +53.602d {+53d 36' 08"} (1950)
GRB_ERROR:       3.49 [deg radius, statistical only]
GRB_DATE:        19005 TJD;   157 DOY;   20/06/05
GRB_TIME:        65862.19 SOD {18:17:42.19} UT
GRB_PHI:         353.00 [deg]
GRB_THETA:        46.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        74.30d {+04h 57m 13s}  +22.65d {+22d 39' 06"}
SUN_DIST:         34.16 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
MOON_POSTN:      254.01d {+16h 56m 02s}  -21.43d {-21d 25' 38"}
MOON_DIST:       144.60 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      160.42, 16.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.07, 30.17 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_lc_medres34_bn200605762.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_locplot_all_bn200605762.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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8637).

GCN Circular #27892
The Fermi GBM team reports the detection of a likely SHORT GRB
At 18:17:42 UT on 5 Jun 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200605A (trigger 613073867.194696 / 200605762).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 93.0, Dec = 53.6 (J2000 degrees, equivalent to J2000 06h 12m, 53d 36'), with a statistical uncertainty of 3.5 degrees.
The angle from the Fermi LAT boresight is 46.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_skymap_all_bn200605762.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/bn200605762/quicklook/glg_healpix_all_bn200605762.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200605762/quicklook/glg_lc_medres34_bn200605762.gif
GCN Circular #27893
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),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 200605A ( Fermi GBM team, GCN 27892) errorbox 83 sec after notice time and 111 sec after trigger time at 2020-06-05 18:19:33 UT, with upper limit up to 18.0 mag. Observations started at twilight. The observations began at zenith distance = 74 deg. The sun altitude is -13.6 deg.
MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 200605A errorbox 1260 sec after notice time and 1288 sec after trigger time at 2020-06-05 18:39:10 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 70 deg. The sun altitude is -11.4 deg.
The galactic latitude b = 17 deg., longitude l = 161 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1374749
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________


     121 | 2020-06-05 18:19:33 |   MASTER-Kislovodsk | (06h 07m 39.57s , +49d 27m 34.6s) |   C |    20 | 16.6 |        
     156 | 2020-06-05 18:19:33 |   MASTER-Kislovodsk | (06h 07m 39.57s , +49d 27m 34.6s) |   C |    90 | 17.5 |  Coadd 
     167 | 2020-06-05 18:20:13 |   MASTER-Kislovodsk | (06h 07m 44.61s , +49d 28m 01.0s) |   C |    30 | 16.8 |        
     222 | 2020-06-05 18:21:04 |   MASTER-Kislovodsk | (06h 07m 42.78s , +49d 29m 23.4s) |   C |    40 | 16.9 |        
     287 | 2020-06-05 18:22:04 |   MASTER-Kislovodsk | (06h 07m 42.56s , +49d 27m 30.3s) |   C |    50 | 17.0 |        
     362 | 2020-06-05 18:23:14 |   MASTER-Kislovodsk | (06h 07m 44.75s , +49d 29m 07.2s) |   C |    60 | 17.0 |        
     635 | 2020-06-05 18:27:17 |   MASTER-Kislovodsk | (06h 18m 33.37s , +53d 25m 33.8s) |   C |   120 | 17.3 |        
     790 | 2020-06-05 18:27:17 |   MASTER-Kislovodsk | (06h 18m 33.37s , +53d 25m 33.8s) |   C |   430 | 18.0 |  Coadd 
     786 | 2020-06-05 18:29:38 |   MASTER-Kislovodsk | (06h 18m 30.63s , +53d 26m 34.7s) |   C |   140 | 17.4 |        
     961 | 2020-06-05 18:32:18 |   MASTER-Kislovodsk | (06h 18m 30.43s , +53d 25m 04.7s) |   C |   170 | 17.4 |        
    1157 | 2020-06-05 18:35:29 |   MASTER-Kislovodsk | (06h 18m 33.67s , +53d 26m 26.9s) |   C |   180 | 17.4 |        
    1298 | 2020-06-05 18:38:49 |   MASTER-Kislovodsk | (06h 18m 54.75s , +49d 51m 28.0s) |   C |    60 | 17.1 |        
    1319 | 2020-06-05 18:39:10 |      MASTER-Tavrida | (06h 07m 53.07s , +51d 59m 35.0s) |   C |    60 | 16.1 |        
    1378 | 2020-06-05 18:40:10 |   MASTER-Kislovodsk | (06h 06m 27.94s , +49d 52m 07.6s) |   C |    60 | 17.1 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #27900
K. Hurley, on behalf of the IPN,
I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, 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,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The short-duration GRB 200605A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27892) has been detected by Fermi (GBM trigger 613073867), Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), and Swift (BAT), so far, at about 65862 s UT (18:17:42). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    95.839 (06h 23m 21s) +50.954 (+50d 57' 14")
  Corners:
    96.116 (06h 24m 28s) +51.192 (+51d 11' 29")
    95.683 (06h 22m 44s) +51.188 (+51d 11' 16")
    95.565 (06h 22m 16s) +50.715 (+50d 42' 52")
    95.993 (06h 23m 58s) +50.719 (+50d 43' 09")
  ---------------------------------------------
```
The error box area is 460 sq. arcmin, and its maximum dimension is 35 arcmin (the minimum one is 16 arcmin). The Sun distance was 33 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final position (GCN Circ. 27892).
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200605_T65862/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
The Swift (BAT) event data used for the IPN localization came from the GUANO system (https://www.swift.psu.edu/guano/).
GCN Circular #27911
Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The short GRB 200605A (Fermi GBM Localization: the Fermi GBM team, GCN Circ. 27892; IPN triangulation: Hurley et al., GCN Circ. 27900; https://gcn.gsfc.nasa.gov/other/200605A.gcn3) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 18:17:42.317 UTC on 5 June 2020. The burst signal was seen by only the SGM detector. The source location was outside the FOV of the HXM detectors. Because of a problem in one of the ground alert processing script, the GCN notice was not distributed automatically for this event.
The burst light curve shows a double-peaked pulse which starts at T-0.176 sec, peaks at -0.048 sec and ends at T+0.256 sec. The T90 and T50 durations measured by the SGM data are 0.368 +- 0.062 sec and 0.232 +- 0.051 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1275416255/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #27912
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The short-duration GRB 200605A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27892; IPN triangulation: Hurley et al., GCN Circ. 27900; CALET-GRBM detection: Kawakubo et al., GCN Circ. 27911) triggered Konus-Wind at T0=65858.111 s UT (18:17:38.111).
The burst light curve shows a multipeaked structure which starts at ~T0 and has a total duration of ~0.4 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/GRB200605_T65862/
As observed by Konus-Wind, the burst had a fluence of 3.63(-0.51,+0.60)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.016 s, of 2.48(-0.69,+0.75)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 = -0.82(-0.20,+0.23) and Ep = 744(-174,+273) keV (chi2 = 23/28 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.2 (chi2 = 23/27 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 10-Jun-2020 [Disclaimer]