GRB 200605A
GCN Circular 27892
Subject
GRB 200605A: Fermi GBM Final Real-time Localization
Date
2020-06-05T18:28:02Z (5 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
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
Subject
Fermi GRB 200605A: Global MASTER-Net observations report
Date
2020-06-05T18:45:41Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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
Subject
IPN triangulation of GRB 200605A (short)
Date
2020-06-07T17:20:20Z (5 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
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
Subject
GRB 200605A: CALET Gamma-Ray Burst Monitor detection
Date
2020-06-09T11:11:36Z (5 years ago)
From
Valentin Pal'shin at AGU <val@phys.aoyama.ac.jp>
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
Subject
Konus-Wind detection of GRB 200605A
Date
2020-06-09T12:12:44Z (5 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
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.