GRB 200625A
GCN Circular 28028
Subject
GRB 200625A: Fermi GBM Final Real-time Localization
Date
2020-06-25T12:56:11Z (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 LONG GRB
At 12:45:49 UT on 25 Jun 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200625A (trigger 614781954.14304 / 200625532).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 169.9, Dec = -22.0 (J2000 degrees, equivalent to J2000 11h 19m, -22d 00'), with a statistical uncertainty of 8.8 degrees.
The angle from the Fermi LAT boresight is 104.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200625532/quicklook/glg_skymap_all_bn200625532.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/bn200625532/quicklook/glg_healpix_all_bn200625532.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200625532/quicklook/glg_lc_medres34_bn200625532.gif
GCN Circular 28029
Subject
Fermi GRB 200625A: Global MASTER-Net observations report
Date
2020-06-25T17:30:14Z (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-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 200625A ( Fermi GBM team, GCN 28028) errorbox 14507 sec after notice time and 14536 sec after trigger time at 2020-06-25 16:48:05 UT, with upper limit up to 19.6 mag. Observations started at twilight. The observations began at zenith distance = 35 deg. The sun altitude is -13.4 deg.
The galactic latitude b = 14 deg., longitude l = 260 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1389977
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
14567 | 2020-06-25 16:48:05 | MASTER-SAAO | (09h 42m 15.87s , -27d 53m 20.4s) | C | 60 | 19.3 |
14567 | 2020-06-25 16:48:05 | MASTER-SAAO | (09h 34m 31.43s , -27d 54m 33.0s) | C | 60 | 19.0 |
14647 | 2020-06-25 16:49:25 | MASTER-SAAO | (09h 32m 01.48s , -25d 54m 32.3s) | C | 60 | 19.4 |
14647 | 2020-06-25 16:49:25 | MASTER-SAAO | (09h 24m 25.35s , -25d 55m 45.4s) | C | 60 | 19.1 |
14727 | 2020-06-25 16:50:45 | MASTER-SAAO | (09h 49m 43.62s , -25d 55m 02.8s) | C | 60 | 19.4 |
14727 | 2020-06-25 16:50:45 | MASTER-SAAO | (09h 42m 07.31s , -25d 56m 14.8s) | C | 60 | 19.1 |
14806 | 2020-06-25 16:52:05 | MASTER-SAAO | (09h 40m 14.87s , -23d 54m 49.1s) | C | 60 | 19.4 |
14806 | 2020-06-25 16:52:05 | MASTER-SAAO | (09h 32m 46.08s , -23d 56m 01.3s) | C | 60 | 19.2 |
14886 | 2020-06-25 16:53:25 | MASTER-SAAO | (09h 42m 17.87s , -27d 53m 21.8s) | C | 60 | 19.5 |
14886 | 2020-06-25 16:53:25 | MASTER-SAAO | (09h 34m 33.52s , -27d 54m 32.8s) | C | 60 | 19.2 |
14966 | 2020-06-25 16:54:45 | MASTER-SAAO | (09h 31m 58.93s , -25d 55m 27.3s) | C | 60 | 19.5 |
14966 | 2020-06-25 16:54:45 | MASTER-SAAO | (09h 24m 22.77s , -25d 56m 39.4s) | C | 60 | 19.3 |
15046 | 2020-06-25 16:56:04 | MASTER-SAAO | (09h 42m 12.57s , -25d 54m 28.9s) | C | 60 | 19.3 |
15126 | 2020-06-25 16:57:24 | MASTER-SAAO | (09h 40m 09.34s , -23d 54m 15.1s) | C | 60 | 19.6 |
15126 | 2020-06-25 16:57:24 | MASTER-SAAO | (09h 32m 40.58s , -23d 55m 26.8s) | C | 60 | 19.4 |
15206 | 2020-06-25 16:58:44 | MASTER-SAAO | (09h 35m 13.23s , -29d 53m 37.1s) | C | 60 | 19.5 |
15206 | 2020-06-25 16:58:44 | MASTER-SAAO | (09h 27m 19.84s , -29d 54m 47.7s) | C | 60 | 19.3 |
15285 | 2020-06-25 17:00:04 | MASTER-SAAO | (09h 24m 15.09s , -27d 54m 53.3s) | C | 60 | 19.5 |
15285 | 2020-06-25 17:00:04 | MASTER-SAAO | (09h 16m 30.81s , -27d 56m 04.7s) | C | 60 | 19.3 |
15577 | 2020-06-25 17:04:56 | MASTER-SAAO | (09h 35m 20.29s , -29d 55m 08.6s) | C | 60 | 19.5 |
15577 | 2020-06-25 17:04:56 | MASTER-SAAO | (09h 27m 27.09s , -29d 56m 16.9s) | C | 60 | 19.4 |
15657 | 2020-06-25 17:06:16 | MASTER-SAAO | (09h 24m 12.21s , -27d 54m 16.1s) | C | 60 | 19.6 |
15657 | 2020-06-25 17:06:16 | MASTER-SAAO | (09h 16m 28.28s , -27d 55m 25.3s) | C | 60 | 19.3 |
15737 | 2020-06-25 17:07:35 | MASTER-SAAO | (09h 53m 43.70s , -29d 54m 39.3s) | C | 60 | 19.6 |
15737 | 2020-06-25 17:07:35 | MASTER-SAAO | (09h 45m 50.32s , -29d 55m 46.5s) | C | 60 | 19.5 |
15817 | 2020-06-25 17:08:55 | MASTER-SAAO | (10h 00m 26.93s , -27d 53m 20.6s) | C | 60 | 19.6 |
15817 | 2020-06-25 17:08:55 | MASTER-SAAO | (09h 52m 42.64s , -27d 54m 28.0s) | C | 60 | 19.4 |
15896 | 2020-06-25 17:10:15 | MASTER-SAAO | (09h 57m 37.66s , -23d 53m 52.2s) | C | 60 | 19.5 |
15896 | 2020-06-25 17:10:15 | MASTER-SAAO | (09h 50m 08.91s , -23d 55m 00.8s) | C | 60 | 19.4 |
15977 | 2020-06-25 17:11:35 | MASTER-SAAO | (09h 31m 34.82s , -21d 53m 30.1s) | C | 60 | 19.6 |
15977 | 2020-06-25 17:11:35 | MASTER-SAAO | (09h 24m 13.01s , -21d 54m 40.5s) | C | 60 | 19.4 |
16057 | 2020-06-25 17:12:55 | MASTER-SAAO | (09h 45m 52.65s , -29d 55m 20.0s) | C | 60 | 19.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 28031
Subject
GRB 200625A: Swift ToO observations
Date
2020-06-26T03:02:16Z (5 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/LAT GRB 200625A.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021006
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 Fermi/LAT 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 28035
Subject
GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
Date
2020-06-26T14:53:07Z (5 years ago)
From
Magnus Axelsson at Stockholm U. <magaxe@kth.se>
M. Axelsson (KTH & Stockholm Univ.), M. Ohno (Hiroshima Univ.), N. Di Lalla (Stanford Univ.), M. Arimoto (Kanazawa Univ.), S. Cutini (INFN Perugia) and F. Longo (Univ. and INFN Trieste) report on behalf of the Fermi-LAT Collaboration:
On June 25th, 2020, Fermi-LAT detected high-energy emission potentially related to the afterglow of GRB 200625A, detected by Fermi-GBM (trigger 614781954/200625532 Fermi GBM Team GCN 28028).
The best LAT on-ground location is found to be
RA, Dec 172.8, -14.7 (degrees, J2000)
with an error radius of 0.2 deg (90% containment, statistical error only). This was 97 deg from the LAT boresight at the time of the GBM trigger:
T0 = 12:45:49.14 UT.
The position is 8 degrees from the GBM location, and came into the LAT FoV ~3500 s after the trigger. The data from Fermi-LAT show a significant increase in the event rate in the time interval 3500-7000 s after the GBM trigger. The photon flux above 100 MeV in this time interval is 5.9e-07 +/- 2.9 e-07 ph/cm2/s, and the estimated photon index above 100 MeV is -1.8 +/- 0.3.
However, we note that the best localization is close (16 arcmin) from the known high-energy source PKS 1127-14 (4FGL J1129.8-1447). Analysis reveals that the significance of the excess increases in the following observation window, and reaches a maximum in the time interval T0+15ks to T0+18ks (photon flux 1.7e-06 +/- 5.7e-7 ph/cm2/s; spectral index -2.1 +/- 0.24).
The increased significance at later times points to PKS 1127-14 (an FSRQ at z=1.18) as the source of the emission, rather than GRB 200625A. However, we do not find any similar excess in the time windows before the trigger (T0-8ks to T0-5ks) or at later times (>T0+30ks), indicating a short and bright flare.
The initial detection of a transient event near the position of GRB 200625A led to a LAT offline position notice being issued. As a result, a Swift ToO observation has been made for this event (likely an FSRQ flare).
The Fermi-LAT point of contact for this burst is Magnus Axelsson (magaxe@kth.se<mailto:magaxe@kth.se>).
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.