GRB 250119B
GCN Circular 38979
Subject
GRB 250119B: Fermi GBM Final Real-time Localization
Date
2025-01-19T08:37:41Z (4 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 08:27:01 UT on 19 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250119B (trigger 758968026.673982 / 250119352).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 306.7, Dec = 21.2 (J2000 degrees, equivalent to J2000 20h 26m, 21d 11'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 106.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_skymap_all_bn250119352.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_healpix_all_bn250119352.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
GCN Circular 38980
Subject
GRB 250119B: BALROG localization (Fermi Trigger 758968026 / GRB 250119352)
Date
2025-01-19T08:59:13Z (4 months ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
Via
email
T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
758968026 at 08:27:01 on 19 Jan. 2025 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position is:
RA(2000.0) = 306.3 deg
Decl.(2000.0) = 19.3 deg
The 1 sigma statistical error radius is 1.8 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250119352/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250119352/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250119352/json
GCN Circular 38997
Subject
GRB 250119B: INTEGRAL/SPI-ACS detection
Date
2025-01-20T11:35:31Z (4 months ago)
Edited On
2025-01-22T14:08:00Z (4 months ago)
From
Aishwarya L Thakur at INAF-IAPS, Rome <aishth@outlook.com>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Aishwarya L Thakur at INAF-IAPS, Rome <aishth@outlook.com>
Via
Web form
Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report:
GRB 250119B was discovered by Fermi/GBM (GCN 38979, 38980) at time 2025-01-19T08:27:01 (UTC). We searched for any corresponding counterpart in the INTEGRAL/SPI-ACS data.
In a SPI-ACS light curve above 80 keV we find a signal temporally coincident with the GBM detection having an approximate duration of ~ 60 sec.The signal consists of several pulses over this duration.
The approximate peak count rate in SPI-ACS is 90,000 cts/s for E>80 keV, over a median background rate of 65,400 cts/s.
This work is based on observations with INTEGRAL, an ESA project with instruments and a science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany.
-----
(a) INAF/IAPS-Rome
(b) ICSC National Research Centre for High-Performance Computing
GCN Circular 39003
Subject
GRB 250119B: Fermi GBM Observation
Date
2025-01-20T16:45:38Z (4 months ago)
From
Utkarsh Pathak at IIT Bombay <utkarshpathak.07@gmail.com>
Via
Web form
U. Pathak (IITB), R. Sonawane (IISER, TVM), and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 08:27:01.67 UT on 19 January 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250119B (trigger 758968026/250119352) which was also
detected by INTEGRAL/SPI-ACS (Barria et al. 2025, GCN 38997).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 306.74, Dec = 21.23 (J2000 degrees, equivalent to
J2000 20h 26m, +21d 13'), with a statistical uncertainty of 1.00 degrees.
(radius, 1-sigma containment, statistical only; there is additionally a
systematic error which we have characterized as a mixture of two Gaussians,
one with a radius of 1.8 degrees (52% contribution) and one with a radius
of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).
The angle from the Fermi LAT boresight is 106 degrees.
The GBM light curve consists of two emission episodes with multiple spikes
for a duration (T90) of about 255.5 s (50-300 keV). The time-averaged spectrum
from T0-4 to T0+300 s is best fit by
a Band function with Epeak = 297 +/- 14 keV,
alpha = -0.98 +/- 0.02, and beta = -2.6 +/- 0.2.
The event fluence (10-1000 keV) in this time interval is
(9.2 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+44 s in the 10-1000 keV band is 17.6 +/- 0.4 ph/s/cm^2.
A power law function with an exponential high-energy cutoff fits the spectrum
equally well with Epeak= 314 +/- 11 keV, and alpha = -0.99 +/- 0.02.
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 39007
Subject
GRB 250119B: Swift/BAT-GUANO localization skymap of a long burst
Date
2025-01-22T02:44:43Z (4 months ago)
From
Samuele Ronchini at PSU <sjs8171@psu.edu>
Via
Web form
Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 250119B onboard (T0: 2025-01-19T08:27:02.72 UTC, Fermi GCN 38979, BALROG GCN 38980, INTEGRAL GCN 38997)
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 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 32.6 in a 8.192 s analysis time bin, starting at T0+16.3844 s.
Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2025. in prep)
The 90% credible area is 82 deg2 and the 50% credible area is 25 deg2.
The integrated probability inside the coded field of view is 1%.
The NITRATES skymap is consistent with the Fermi and BALROG localizations.
A plot of the probability skymap can be viewed here:
[skymap_plot](https://guano.swift.psu.edu/trigger_report?id=758968057/#:~:text=Probability%20Skymap)
The probability skymap file can be downloaded from the link here
[skymap_fits_file](https://guano.swift.psu.edu/files/758968057/0_n_PROBMAP)
Instructions on how to read and manipulate this map can be found here:
https://guano.swift.psu.edu/documentation
More details about this burst can be found on the trigger report page here:
https://guano.swift.psu.edu/trigger_report?id=758968057
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 39015
Subject
IPN triangulation of GRB 250119B
Date
2025-01-23T15:15:15Z (4 months ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
Web form
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The bright, long-duration GRB 250119B
(Fermi-GBM detection: The Fermi GBM team, GCN 38979;
BALROG localization: Preis et al., GCN 38980;
INTEGRAL-SPI-ACS detection: Barria et al., GCN 38997;
Swift-BAT/GUANO detection: Ronchini et al., 39007)
was detected by Fermi (GBM trigger 758968026), Konus-Wind,
INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND)
at about 30421 s UT (08:27:01).
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:
304.147 (20h 16m 35s) +22.039 (+22d 02' 20")
Corners:
308.304 (20h 33m 13s) +21.164 (+21d 09' 51")
307.706 (20h 30m 49s) +21.495 (+21d 29' 42")
299.904 (19h 59m 37s) +22.564 (+22d 33' 49")
300.555 (20h 02m 13s) +22.329 (+22d 19' 46")
---------------------------------------------
The error box area is 1.4 sq. deg, and its maximum
dimension is 7.9 deg (the minimum one is 11.5 arcmin).
The Sun distance was 42 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM/RoboBA (GCN 38979), BALROG (GCN 38980),
and Swift-BAT/GUANO (GCN 39007) localizations.
The burst lightcurve shows two separate emission episodes at ~T0(KW) and at ~T0(KW)+250 s.
The IPN localization of the second emission episode is consistent with the first one.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250119_T30434/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
GCN Circular 39016
Subject
Konus-Wind detection of GRB 250119B
Date
2025-01-23T15:22:17Z (4 months ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long-duration GRB 250119B
(Fermi-GBM detection: Fermi GBM team, GCN 38979;
Preis et al., GCN 38980; Pathak et al., GCN 39003;
INTEGRAL/SPI-ACS detection: Barria et al., GCN 38997;
Swift-BAT/GUANO detection: Ronchini et al., 39007
IPN triangulation: Kozyrev et al., GCN 39015)
triggered Konus-Wind at T0=30434.631 s UT (08:27:14.631).
The burst light curve shows two separated multipeaked emission episodes.
The first episode starts at ~T0-18.6 s and has a total duration of ~162 s,
the second starts at ~T0+233 s and lasts up to ~T0+274 s.
The emission is seen up to ~3 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB250119_T30434/
As observed by Konus-Wind, the burst
had a fluence of 1.36(-0.16,+0.16)x10^-4 erg/cm2,
and a 64-ms peak flux, measured from T0+31.440 s,
of 9.43(-1.10,+1.11)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+273.664 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -1.02(-0.08,+0.09),
the high energy photon index beta = -2.37(-0.35,+0.19),
the peak energy Ep = 332(-36,+43) keV
(chi2 = 95/96 dof).
The spectrum near the maximum count rate
(measured from T0+29.184 to T0+36.096 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.64(-0.08,+0.09),
the high energy photon index beta = -2.43(-0.17,+0.12),
the peak energy Ep = 297(-20,+23) keV
(chi2 = 85/79 dof).
All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.
GCN Circular 39460
Subject
GRB 250119B: VZLUSAT-2 detection
Date
2025-02-24T18:21:07Z (3 months ago)
From
Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>
Via
Web form
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.
The long-duration GRB 250119B (FERMI/GBM detection: GCN 38979; INTEGRAL/SPI-ACS detection: GCN Circular 38997; Swift/BAT-GUANO detection: GCN 39007; Konus/Wind detection: GCN 39016; NuSTAR detection at 2025-01-19 08:27:23 UTC) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2025-01-19 08:27:44 UTC. The T90 duration is 41 s and the significance during T90 reaches 66 sigma.
The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB250119B_GCN_VZLUSAT2.pdf
All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/
The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.