Gamma-ray Burst 260207A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 07 Feb 26 05:43:11 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     792135758
GRB_RA:          176.367d {+11h 45m 28s} (J2000),
                 176.695d {+11h 46m 47s} (current),
                 175.740d {+11h 42m 58s} (1950)
GRB_DEC:         -36.750d {-36d 45' 00"} (J2000),
                 -36.895d {-36d 53' 41"} (current),
                 -36.472d {-36d 28' 19"} (1950)
GRB_ERROR:       10.38 [deg radius, statistical plus systematic]
GRB_INTEN:       111 [cnts/sec]
DATA_SIGNIF:     9.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.78
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      62%  GRB
2nd_MOST_LIKELY:  36%  Distant Particles
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.89d {+21h 23m 33s}  -15.29d {-15d 17' 38"}
SUN_DIST:        117.86 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:      200.00d {+13h 20m 01s}  -12.41d {-12d 24' 17"}
MOON_DIST:        32.19 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      288.48, 24.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      193.46,-34.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 257.17,25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 07 Feb 26 05:43:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     792135758
GRB_RA:          163.817d {+10h 55m 16s} (J2000),
                 164.123d {+10h 56m 29s} (current),
                 163.232d {+10h 52m 56s} (1950)
GRB_DEC:         -35.400d {-35d 23' 59"} (J2000),
                 -35.540d {-35d 32' 22"} (current),
                 -35.133d {-35d 07' 58"} (1950)
GRB_ERROR:       13.27 [deg radius, statistical plus systematic]
GRB_INTEN:       152 [cnts/sec]
DATA_SIGNIF:     6.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          94.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.73
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      72%  GRB
2nd_MOST_LIKELY:  25%  Distant Particles
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.89d {+21h 23m 33s}  -15.29d {-15d 17' 38"}
SUN_DIST:        124.60 [deg]   Sun_angle= 10.5 [hr] (West of Sun)
MOON_POSTN:      200.00d {+13h 20m 01s}  -12.40d {-12d 24' 15"}
MOON_DIST:        39.76 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      277.72, 21.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      181.61,-38.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 257.17,25.57 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 07 Feb 26 05:43:21 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     792135758
GRB_RA:          176.230d {+11h 44m 55s} (J2000),
                 176.558d {+11h 46m 14s} (current),
                 175.604d {+11h 42m 25s} (1950)
GRB_DEC:         -36.070d {-36d 04' 11"} (J2000),
                 -36.215d {-36d 12' 53"} (current),
                 -35.792d {-35d 47' 31"} (1950)
GRB_ERROR:       6.47 [deg radius, statistical only]
DATA_SIGNIF:     10.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          93.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       320.89d {+21h 23m 33s}  -15.29d {-15d 17' 37"}
SUN_DIST:        118.45 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:      200.01d {+13h 20m 01s}  -12.41d {-12d 24' 19"}
MOON_DIST:        31.81 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      288.16, 24.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      192.95,-34.15 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_792135758.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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:     Sat 07 Feb 26 05:44:00 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     792135758
GRB_RA:          175.050d {+11h 40m 12s} (J2000),
                 175.375d {+11h 41m 30s} (current),
                 174.430d {+11h 37m 43s} (1950)
GRB_DEC:         -38.410d {-38d 24' 35"} (J2000),
                 -38.555d {-38d 33' 16"} (current),
                 -38.133d {-38d 07' 57"} (1950)
GRB_ERROR:       5.34 [deg radius, statistical only]
DATA_SIGNIF:     12.00 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        49.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.89d {+21h 23m 33s}  -15.29d {-15d 17' 37"}
SUN_DIST:        117.22 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:      200.01d {+13h 20m 03s}  -12.41d {-12d 24' 28"}
MOON_DIST:        34.09 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      287.91, 22.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      193.34,-36.65 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_792135758.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
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:     Sat 07 Feb 26 05:44:35 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     792135758
GRB_RA:          162.830d {+10h 51m 19s} (J2000),
                 163.136d {+10h 52m 33s} (current),
                 162.246d {+10h 48m 59s} (1950)
GRB_DEC:         -33.990d {-33d 59' 23"} (J2000),
                 -34.129d {-34d 07' 43"} (current),
                 -33.724d {-33d 43' 27"} (1950)
GRB_ERROR:       4.30 [deg radius, statistical only]
DATA_SIGNIF:     13.40 [sigma]
DATA_INTERVAL:   10.240 [sec]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          96.00 [deg]
GRB_THETA:        39.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.89d {+21h 23m 33s}  -15.29d {-15d 17' 36"}
SUN_DIST:        126.23 [deg]   Sun_angle= 10.5 [hr] (West of Sun)
MOON_POSTN:      200.02d {+13h 20m 04s}  -12.41d {-12d 24' 36"}
MOON_DIST:        39.89 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      276.23, 22.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      179.84,-37.61 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_792135758.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
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:     Sat 07 Feb 26 05:51:51 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     792135758
GRB_RA:          160.450d {+10h 41m 48s} (J2000),
                 160.751d {+10h 43m 00s} (current),
                 159.874d {+10h 39m 30s} (1950)
GRB_DEC:         -34.440d {-34d 26' 23"} (J2000),
                 -34.577d {-34d 34' 36"} (current),
                 -34.178d {-34d 10' 40"} (1950)
GRB_ERROR:       3.29 [deg radius, statistical only]
GRB_DATE:        21078 TJD;    38 DOY;   26/02/07
GRB_TIME:        20553.65 SOD {05:42:33.65} UT
GRB_PHI:          95.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.89d {+21h 23m 35s}  -15.29d {-15d 17' 31"}
SUN_DIST:        126.68 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      200.07d {+13h 20m 17s}  -12.44d {-12d 26' 13"}
MOON_DIST:        41.91 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      274.63, 21.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      177.92,-38.95 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_locplot_all_bn260207238.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 Long GRB.

GCN Circular #43628
The Fermi GBM team reports the detection of a likely LONG GRB
"At 05:42:33.65 UT on 07 February 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260207A (trigger 792135758/260207238).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 160.45, Dec = -34.44 (J2000 degrees, equivalent to J2000 10h 41m, -34d 26'), with a statistical uncertainty of 3.29 degrees.
The angle from the Fermi LAT boresight is 37 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_skymap_all_bn260207238.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_healpix_all_bn260207238.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260207238/quicklook/glg_lc_medres34_bn260207238.gif"
GCN Circular #43633
C. Francile (OAFA), O.Gress (ISU), V.M.Lipunov (Lomonosov MSU), R.Podesta, F.Podesta (OAFA), D.Svinkin, A.Ridnaya (Ioffe Institute), I.Panchenko, P.Balanutsa, G.Antipov, A.Kuznetsov, E.Gorbovskoy, N. Tiurina, Ya.Kechin,A.Chasovnikov, V.A.Senik, D.Vlasenko, I.Ionov,Yu.Tselik(Lomonosov MSU), N.Budnev, R.Mirgazov, A.Diachok, O.Ershova (Irkutsk State University), E. Gonzalez (OAFA, San JuanUni.,Argentina); D.Buckley (SAAO), A. Sosnovskij (CrAO RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino, J.Martinez, A.R.Corella, J.G. Tanori, L. F. Villalobos, L.H.Rodriguez (INAOE, Guillermo Haro AstrophysicObservatory, Mexico) V.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias,Spain)
MASTER Global Robotic Net started (Lipunov et al. GCN 43627) Fermi GRB 260207A (GCN 43628) alert observtions at MASTER-OAFA 110 sec after notice time and 142 sec after trigger time at 2026-02-07 05:44:56 UT
MASTER OT J104411.31-330936.2 discovery
V.Lipunov (Lomonosov MSU), E.Gorbovskoy, N.Tiurina, P.Balanutsa, A.Kuznetsov, V.Kornilov, O.Gress, K.Ivanov, V.Vladimirov, D.Kuvshinov (Lomonosov Moscow State University, SAI)
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 10h 44m 11.31s -33d 09m 36.2s on 2026-02-07.24049 UT.
The OT unfiltered magnitude was 17.3m(mlim19.8=).
The OT is seen in 27 images with typical decay with different features at light curves.
There is no minor planet at this place.
We have reference image on 2025-02-08.36365 UT with unfiltered 20.1m. Deep photometry and spectral observations are required.
We reobserved this coordinates at MASTER-SAAO at 2026-02-07 18:59:00 without object, that confirmed GRB optical counterpart nature
GCN Circular #43936
S. I Chastain (TTU) and M. M. Fausnaugh (TTU) report:
Approximately 93% of the Fermi GBM localization of GRB 260207A (Fermi GBM Team, GCN 43628) fell within the field of view of the Transiting Exoplanet Survey Satellite (TESS; Ricker et al. JATIS 1 2015) during observations of sector 100.
We identified a counterpart consistent with the counterpart reported by MASTER-OT (C. Francile et al., GCN 43633).
At around 14 days post-burst, we carried out VLA observations of this counterpart and identified a faint source within the error region with a flux of 24 +/- 4 microJy/BM at 6 GHz. The position of this source is:
```
RA (J2000): 10:44:11.3314 ± 0.0016 seconds
Declination (J2000):  -33:09:36.053 ± 0.067 arcseconds
```
This circular includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
These observations were carried out as part of project SF171128, approved in the framework of the Fermi - NRAO joint program agreement.

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Jochen Greiner, last update: 06-Mar-2026 [Disclaimer]