January 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 36947] EP250111a: SAO RAS optical upper limit
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38940 SUBJECT: EP250111a: SAO RAS optical upper limit DATE: 25/01/14 15:52:04 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report on behalf of the GRB follow-up team. We observed the field of X-ray transient EP250111a detected by EP (Zhao et al., GCN 38905) and Swift (Kennea et al., GCN 38910) with the SAO RAS 1-m telescope Zeiss-1000 on January 11, 18:51:53--19:56:25 UT (t_mid - T0 = 18.057 hours = 0.7524 days). We obtained 10 x 300 sec. images in Rc band. We did not detect the OT (Fu et al., GCN 38906; Pankov et al., GCN 38913; Zheng et al., GCN 38916) in the stacked image down to the limiting magnitude of R_lim > 21.15 (calibrated anainst nearby USNO-B1 stars and not corrected for the MW extinction). View this GCN Circular online at https://gcn.nasa.gov/circulars/38940. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36946] LIGO/Virgo/KAGRA S250114ax: NED Galaxies in the Localization Volume
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38939 SUBJECT: LIGO/Virgo/KAGRA S250114ax: NED Galaxies in the Localization Volume DATE: 25/01/14 14:45:29 GMT FROM: David Cook at Caltech/IPAC-NED <dcook(a)ipac.caltech.edu> David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC) On behalf of the NASA/IPAC Extragalactic Database (NED) Team. We spatially cross-matched the LVK S250114ax-3-Initial sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 2284 galaxies within the 90% containment volume, and we list here the top 20 galaxies sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full or top 20 list of galaxies in the 90% volume go either to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/ or click on the following links: Full List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250114ax/3 Top 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250114ax/3/20 The NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic follow-up observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D * P_SFR; and specific star formation rate, P_3D * P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume. | objname| ra| dec|objtype| DistMpc|DistMpc_unc| m_NUV| m_NUV_unc| m_Ks| m_Ks_unc| m_W1| m_W1_unc| P_3D|P_3D_LumW1| |-------------------------|--------------|--------------|-------|-----------|-----------|------------|------------|------------|------------|------------|------------|--------|----------| |WISEA J093220.56+251556.2| 143.08562| 25.26563| G| 292.07| 0.05| null| null| null| null| 8.990| 0.006|8.06e-07| 8.74e-09| |WISEA J102022.07+355930.8| 155.09194| 35.99190| G| 483.78| 0.12| null| null| 13.320| 0.129| 11.845| 0.007|3.12e-06| 6.68e-09| |WISEA J100500.42+324505.5| 151.25175| 32.75138| G| 423.57| 0.09| null| null| 13.634| 0.132| 10.078| 0.006|7.72e-07| 6.45e-09| |WISEA J090550.01+152107.3| 136.45835| 15.35192| G| 511.52| 0.08| null| null| 14.307| 0.263| 9.604| 0.006|2.25e-07| 4.25e-09| |WISEA J093527.08+261709.6| 143.86289| 26.28603| QSO| 574.23| 0.10| 17.503| 0.029| 12.834| 0.101| 11.630| 0.007|1.11e-06| 4.10e-09| |WISEA J101629.63+352013.4| 154.12351| 35.33699| G| 473.98| 0.06| null| null| 13.767| 0.099| 12.577| 0.013|3.31e-06| 3.47e-09| |WISEA J100502.47+332945.3| 151.26023| 33.49586| G| 427.12| 0.08| null| null| 12.666| 0.089| 12.471| 0.010|3.69e-06| 3.46e-09| |WISEA J101541.71+351111.6| 153.92387| 35.18652| G| 471.79| 0.11| null| null| 12.981| 0.125| 12.653| 0.015|3.33e-06| 3.22e-09| |WISEA J101130.53+341204.0| 152.87724| 34.20114| G| 457.03| 0.21| null| null| 12.380| 0.104| 12.339| 0.010|2.55e-06| 3.10e-09| |WISEA J094400.34+285226.8| 146.00147| 28.87415| G| 481.46| 0.21| null| null| 12.867| 0.181| 12.587| 0.012|2.67e-06| 2.86e-09| |WISEA J100754.06+340153.1| 151.97529| 34.03149| G| 591.45| 0.08| 20.521| 0.228| 12.676| 0.100| 11.987| 0.007|1.01e-06| 2.83e-09| |WISEA J095318.32+310410.9| 148.32637| 31.06973| G| 371.11| 0.03| 18.643| 0.046| 12.727| 0.098| 12.440| 0.012|3.81e-06| 2.78e-09| |WISEA J101816.94+354434.1| 154.57056| 35.74274| G| 413.32| 0.11| null| null| 12.650| 0.092| 12.412| 0.011|2.99e-06| 2.78e-09| |WISEA J094414.06+291215.5| 146.05861| 29.20431| G| 515.30| 0.07| null| null| 12.525| 0.113| 12.242| 0.010|1.51e-06| 2.55e-09| |WISEA J102925.12+373747.7| 157.35468| 37.63001| G| 478.02| 0.14| null| null| 12.296| 0.039| 11.825| 0.007|1.19e-06| 2.53e-09| |WISEA J093428.88+272228.7| 143.62045| 27.37482| G| 429.38| null| null| null| 13.506| 0.140| 9.935| 0.006|2.53e-07| 2.48e-09| |WISEA J100754.29+340159.5| 151.97629| 34.03308| G| 600.01| 0.14| null| null| 13.311| 0.029| 12.035| 0.010|8.85e-07| 2.45e-09| |WISEA J101631.11+352122.8| 154.12966| 35.35631| G| 481.62| 0.09| null| null| 13.255| 0.109| 12.996| 0.012|3.21e-06| 2.36e-09| |WISEA J094637.73+294313.0| 146.65722| 29.72030| G| 519.41| 0.23| 21.678| 0.342| 12.783| 0.132| 12.444| 0.009|1.65e-06| 2.35e-09| |WISEA J093805.80+270456.9| 144.52418| 27.08243| G| 414.27| 0.09| 21.530| 0.257| 13.756| 0.071| 12.595| 0.024|2.84e-06| 2.24e-09| Table 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250114ax sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D * P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1). View this GCN Circular online at https://gcn.nasa.gov/circulars/38939. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36945] GRB 250114B: a short GRB detected with INTEGRAL
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38938 SUBJECT: GRB 250114B: a short GRB detected with INTEGRAL DATE: 25/01/14 14:08:18 GMT FROM: Diego Gotz at CEA <diego.gotz(a)cea.fr> D.Gotz (CEA, Saclay), S.Mereghetti (INAF, IASF-Milano), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: a short gamma ray burst lasting about 1 s has been detected by IBAS in the IBIS/ISGRI data at 13:15:37 UT of 2025 January 14. The refined coordinates (J2000) are: R.A.= 48.8765 deg DEC.= -2.3074 deg with an uncertainty of 2.1 arcmin (90% c.l.). A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html View this GCN Circular online at https://gcn.nasa.gov/circulars/38938. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36944] EP250108a: correction to GCN 38908
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38937 SUBJECT: EP250108a: correction to GCN 38908 DATE: 25/01/14 13:26:06 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> Z.P. Zhu (NAOC), G. Corcoran (UCD), A. J. Levan (Radboud), L. Izzo (INAF/OACn), R. Eyles-Ferris (Leicester), J. P. U. Fynbo (DAWN/NBI), G. Leloudas (DTU Space), D. B. Malesani (DAWN/NBI and Radboud), A. Saccardi (CEA/Irfu), A. L. Thakur (INAF/IAPS), D. Xu (NAOC), B. P. Gompertz (U. Birmingham), P. G. Jonker (Radboud), report on behalf of the Stargate collaboration. We carried out a full reduction of the VLT/X-shooter spectrum of EP250108a (Li et al., GCN 38861; Eyles-Ferris, GCN 38878) described by Zhu et al. (GCN 38908), using the most up-to-date calibrations and the complete pipeline procedure. While the overall shape of the continuum and the presence of the narrow emission and absorption lines is unchanged, we cannot recover the very broad feature claimed in our original report at 3600 AA (Zhu et al., GCN 38908), which is most likely spurious. In the new reduction, the continuum remains blue and featureless down to 3200 AA. The determination of the source redshift is unaffected. We apologize for any confusion that our preliminary report might have caused. View this GCN Circular online at https://gcn.nasa.gov/circulars/38937. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36943] GRB 250114A: Enhanced Swift-XRT position
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38936 SUBJECT: GRB 250114A: Enhanced Swift-XRT position DATE: 25/01/14 12:22:09 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 792 s of XRT Photon Counting mode data and 1 UVOT images for GRB 250114A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 166.57609, -15.11189 which is equivalent to: RA (J2000): 11h 06m 18.26s Dec (J2000): -15d 06' 42.8" with an uncertainty of 2.4 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38936. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36942] GRB 250113A: INTEGRAL/SPI-ACS detection
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38935 SUBJECT: GRB 250113A: INTEGRAL/SPI-ACS detection DATE: 25/01/14 10:52:56 GMT FROM: Aishwarya L Thakur at INAF-IAPS, Rome <aishth(a)outlook.com> Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report: GRB 250113A was discovered by SVOM/GRM (GCN 38923) at time 2025-01-13T06:24:36.900 (UTC) with a duration of 42 s. We searched for any corresponding counterpart in the INTEGRAL/SPI-ACS data. In a light curve above 80 keV, we find a pulse temporally coincident with the GRM detection having an approximate duration of ~ 3 sec. The approximate peak count rate is 73000 cts/s over a median background rate of 62500 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/38935. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36941] GRB 250114A: VLT/X-shooter spectroscopic redshift z = 4.732
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38934 SUBJECT: GRB 250114A: VLT/X-shooter spectroscopic redshift z = 4.732 DATE: 25/01/14 10:32:04 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> D. B. Malesani (DAWN/NBI and Radboud), A. Saccardi (CEA/Irfu), S. D. Vergani (GEPI/Obs. de Paris), P. D’Avanzo (INAF/OABr), A. de Ugarte Postigo (CNRS, OCA and LAM), K. E. Heintz (DAWN/NBI), L. Izzo (INAF/OACn and DARK/NBI), A. J. Levan (Radboud), B. Milvang-Jensen (DAWN/NBI), B. Schneider (LAM), N. R. Tanvir (Leicester), A. L. Thakur (INAF/IAPS) report on behalf of the Stargate collaboration. We observed the optical afterglow of GRB 250114A (Klingler et al., GCN 38927; An et al., GCN 38929; Malesani & Izzo, GCN 38930; Francile et al., GCN 38931; Brivio et al., GCN 38933) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-25000 AA, and consist of 4 exposures by 600 s each. The observation mid time was 2025 Jan 14.3549 UT (0.962 hr after the GRB). In a 30 s image taken with the acquisition camera on Jan 14.339 UT, we detect the optical afterglow, for which we measure a magnitude r = 21.58 +- 0.12 AB (calibrated against two nearby stars from the Pan-STARRS catalog). Continuum is clearly detected in the red end of the VIS arm, showing a strong break at 7000 AA, which we interpret as the Lyman break and the onset of the Lyman-alpha forest. From the detection of multiple absorption features, which we interpret as due to Si II 1260, Si II* 1264, O I 1302, C IV 1548,1540, Si II* 1264, and Mg II 2796,2803 (among others), we infer a redshift of z = 4.732. An intervening system at z = 1.642 is also identified via the Mg II 2796,2803 doublet. We acknowledge expert support from the ESO observing staff at UT3, in particular Rodrigo Palominos and Ana Jimenez. View this GCN Circular online at https://gcn.nasa.gov/circulars/38934. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36940] GRB 250114A: REM detection of the optical and NIR counterpart
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38933 SUBJECT: GRB 250114A: REM detection of the optical and NIR counterpart DATE: 25/01/14 10:22:11 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R. Brivio, P. D’Avanzo, M. Ferro (INAF-OAB), D.B. Malesani (DAWN/NBI and Radboud Univ.), A. Melandri (INAF-OAR), M. De Pasquale (Univ. of Messina), S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 250114A, detected by Swift (Klingler et al., GCN 38927) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2025 January 14 at 07:34:43 UT (i.e. 84 sec after the Swift trigger). We detect the counterpart in the optical and NIR images at the position of the optical afterglow (Klingler et al., GCN 38927; An et al., GCN 38929; Malesani & Izzo, GCN 38930; Francile et al., GCN 38931). From preliminary photometry, we measure: r-i ~ 1.4 (calibrated against the Pan-STARRS catalogue), at t - t0 = 84 s; H = 13.2 +/- 0.1 (Vega; calibrated against the 2MASS catalogue), at t - t0 = 101 s. View this GCN Circular online at https://gcn.nasa.gov/circulars/38933. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36939] LIGO/Virgo/KAGRA S250114ax: Identification of a GW compact binary merger candidate
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38932 SUBJECT: LIGO/Virgo/KAGRA S250114ax: Identification of a GW compact binary merger candidate DATE: 25/01/14 09:06:32 GMT FROM: Enzo Tapia at Nikhef <e.tapia(a)nikhef.nl> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S250114ax during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-01-14 08:22:03.223 UTC (GPS time: 1420878141.223). The candidate was found by the CWB [1], cWB BBH [2], GstLAL [3], MBTA [4], MLy [5], PyCBC Live [6], and SPIIR [7] analysis pipelines. S250114ax is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.1e-27 Hz, or about one in 1e19 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S250114ax After parameter estimation by RapidPE-RIFT [8], the classification of the GW signal, in order of descending probability, is BBH (>99%), NSBH (<1%), BNS (<1%), or Terrestrial (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [9] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [8] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [10], distributed via GCN notice about 28 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [10], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at t his time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 37 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 473 +/- 99 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [4] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [5] Skliris et al. (2020) arXiv:2009.14611 [6] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [7] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [8] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002 [9] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [10] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/38932. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36938] Swift GRB250114A: Global MASTER-Net OT detection
by GCN Circulars 14 Jan '25

14 Jan '25

TITLE: GCN CIRCULAR NUMBER: 38931 SUBJECT: Swift GRB250114A: Global MASTER-Net OT detection DATE: 25/01/14 08:47:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina (Lomonosov MSU), O.Gress, N.Budnev(ISU), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the GRB250114A 24 sec after notice time and 63 sec after trigger time at 2025-01-14 07:34:22 UT. On our first (10s exposure) set we found 1 optical transient within Swift error-box (ra=166.588 dec=-15.1422 r=0.05). T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 68 2025-01-14 07:34:22 10 (11h 06m 18.39s , -15d 06m 41.2s) 15.9 The 5-sigma upper limit has been about 17.7mag The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/38931. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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