GRBweb by P. Coppin

This page lists all entries on GRB250107A in GRBweb

Summary Fermi GBM IPN GCN 38836 GCN 38840 GCN 38841 GCN 38844 GCN 38922

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB250107210
T0	5:02:30 UTC	GCN_circulars,Fermi GBM final loc
ra	302.5208°	IPN
decl	45.5667°	IPN
pos_error	6.67e-02°	IPN
T90	53.246 s	Fermi_GBM
T90_error	2.611 s	Fermi_GBM
T90_start	5:02:30.289 UTC	Fermi_GBM
fluence	4.28e-06 erg/cm²	Fermi_GBM
fluence_error	5.88e-08 erg/cm²	Fermi_GBM
T100	53.535 s
GBM_located	False
mjd	60682.210069444445	GCN_circulars,Fermi GBM final loc

Fermi GBM table
GRB_name_Fermi	GRB250107210
trigger_name	bn250107210
ra	302.5200°
decl	45.5639°
pos_error	3.27e+00°
datum	2025-01-07
t_trigger	5:02:30.286 UTC
T90	53.246 s
T90_error	2.611 s
T90_start	5:02:30.289 UTC
fluence	4.28e-06 erg/cm²
fluence_error	5.88e-08 erg/cm²
flux_1024	3.55e+00 erg/cm²/s
flux_1024_error	2.44e-01 erg/cm²/s
flux_1024_time	6.85e+00 erg/cm²/s
flux_64	5.79e+00 erg/cm²/s
flux_64_error	1.07e+00 erg/cm²/s

IPN table
GRB_name	GRB250107A
ra	302.5208°
decl	45.5667°
pos_error	6.67e-02°

GCN 38836 table
GRB_name	GRB250107A
GCN_number	38836
Detection_method	Fermi GBM final loc
t_trigger	5:02:30 UTC
ra	309.4000°
decl	45.3000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 38836 SUBJECT: GRB 250107A: Fermi GBM Final Real-time Localization DATE: 25/01/07 05:12:57 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 05:02:30 UT on 7 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250107A (trigger 757918955.285842 / 250107210). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 309.4, Dec = 45.3 (J2000 degrees, equivalent to J2000 20h 37m, 45d 17'), with a statistical uncertainty of 3.5 degrees. The angle from the Fermi LAT boresight is 23.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250107210/quicklook/glg_skymap_all_bn250107210.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/bn250107210/quicklook/glg_healpix_all_bn250107210.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250107210/quicklook/glg_lc_medres34_bn250107210.gif

GCN 38840 table
GRB_name	GRB250107A
GCN_number	38840
Detection_method	Swift Other
ra	302.5200°
decl	45.5640°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 38840 SUBJECT: GRB 250107A: Swift/BAT-GUANO arcminute localization of a burst DATE: 25/01/07 14:50:34 GMT FROM: Jimmy DeLaunay at Penn State James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 250107A onboard (T0: 2025-01-07T05:02:30.29 UTC, Fermi Trig 757918955). 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), detects the burst in a 16.384 s analysis time bin starting at T0 - 0.0 s with a sqrt(TS) of 21.8. An arcminute localization is found with DeltaLLHOut of 19.3 and a DeltaLLHPeak of 10.5. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. The BAT position is RA, Dec = 302.52, 45.564 deg which is RA(J2000) = 20h 10m 04.80s Dec(J2000) = 45d 33' 50.4″ with an estimated uncertainty of 4 arcmin radius. 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 38841 table
GRB_name	GRB250107A
GCN_number	38841
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 38841 SUBJECT: GRB 250107A: Swift ToO observations DATE: 25/01/07 15:53:44 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Swift/BAT GRB 250107A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021754 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 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 38844 table
GRB_name	GRB250107A
GCN_number	38844
Detection_method	Fermi GBM Det
t_trigger	5:02:30.290 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 38844 SUBJECT: GRB 250107A: Fermi GBM Observation DATE: 25/01/08 01:46:08 GMT FROM: oindabimukherjee@gmail.com O. Mukherjee (USRA), A. Myers (NPP/GSFC) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 05:02:30.29 UT on 07 January 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250107A (trigger 757918955/250107210). which was also detected by Swift/BAT-GUANO (DeLaunay et al. 2025, GCN 38840). The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position. The angle from the Fermi LAT boresight is 21 degrees. The GBM light curve consists of a single emission episode with multiple peaks with a duration (T90) of about 53 s (50-300 keV). The time-averaged spectrum from T0-2.8 to T0+35.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.22 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 390 +/- 80 keV. The event fluence (10-1000 keV) in this time interval is (7.8 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+6.85 s in the 10-1000 keV band is 3.6 +/- 0.24 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 38922 table
GRB_name	GRB250107A
GCN_number	38922
Detection_method	Fermi GBM Det
Circular_text	TITLE: GCN CIRCULAR NUMBER: 38922 SUBJECT: GRB 250107A: VZLUSAT-2 detection DATE: 25/01/13 12:05:33 GMT FROM: Andras Pal at Konkoly Observatory A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, 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 250107A (Fermi/GBM detection: GCN 38836; Swift/BAT-GUANO detection: GCN 38840; INTEGRAL/SPI-ACS peak detection at 2025-01-07 ~05:02:35 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 2025-01-07 05:02:34 UTC. The T90 duration is 21 s and the significance during T90 reaches 9 sigma. The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB250107A_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.