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

[vsnet-grb-info 39616] LIGO/Virgo/KAGRA S250827l: Identification of a GW compact binary merger candidate
by GCN Circulars 27 Aug '25

27 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41552 SUBJECT: LIGO/Virgo/KAGRA S250827l: Identification of a GW compact binary merger candidate DATE: 25/08/27 02:45:38 GMT FROM: Jyotirmaya Mohanta at University of Tsukuba <s2430161(a)u.tsukuba.ac.jp> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S250827l during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-08-27 01:27:57.538 UTC (GPS time: 1440293295.538). 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. S250827l is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S250827l The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%). Assuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [8] 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 for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. The source chirp mass falls with highest probability in the bin (22.0, 44.0) solar masses, assuming the candidate is astrophysical in origin. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [9], distributed via GCN and SCiMMA notices about 32 seconds after the candidate event time. * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [9], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 1145 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2132 +/- 580 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. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008 [4] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234 [5] Skliris et al. PRD 110, 104034 (2024) doi:10.1103/PhysRevD.110.104034 [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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [9] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/41552. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39615] Fermi GRB 250826A: Global MASTER-Net observations report
by GCN Circulars 27 Aug '25

27 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41551 SUBJECT: Fermi GRB 250826A: Global MASTER-Net observations report DATE: 25/08/27 00:30:41 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250826A ( Fermi GBM team, GCN 41545) errorbox 61289 sec after notice time and 61324 sec after trigger time at 2025-08-27 00:26:06 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 80 deg. The sun altitude is -20.9 deg. The galactic latitude b = 47 deg., longitude l = 190 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2977441 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 61355 | 2025-08-27 00:26:06 | MASTER-Kislovodsk | (09h 12m 54.84s , +37d 15m 47.2s) | C | 60 | 16.2 | 61355 | 2025-08-27 00:26:06 | MASTER-Kislovodsk | (09h 17m 46.54s , +36d 51m 26.0s) | C | 60 | 16.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/41551. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39614] GRB 250806A: HiPERCAM/GTC limits on a possible supernova
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41550 SUBJECT: GRB 250806A: HiPERCAM/GTC limits on a possible supernova DATE: 25/08/26 16:15:04 GMT FROM: Antonio de Ugarte Postigo at LAM, CNRS <adeugartepostigo(a)gmail.com> A. de Ugarte Postigo (LAM), D. B. Malesani (DAWN/NBI and Radboud), A. Martin-Carrillo (UCD), C. C. Thoene (AbAO), J. F. Agui Fernandez (CAHA), M. A. Aloy (UV), J. P. U. Fynbo (DAWN/NBI), L. Galbany (IEEC-CSIC), S. Geier (GTC), L. Izzo (INAF/OACN and DARK/NBI), G. Lombardi (GTC), N. A. Rakotondrainibe (LAM), B. Schneider (LAM), N. R. Tanvir (Univ. Leicester), and D. Gonzalez Gonzalez (GTC) report: We observed the field of GRB 250806A (Xie et al., GCN 41243) with the 5-band HiPERCAM imager mounted on the 10.4 m GTC telescope, at the Roque de los Muchachos Observatory (La Palma, Spain). The observation consisted of 20 x 60 s exposures in the u, g, r, i, and z bands, with mean epoch 2025-08-23 01:51:07 UT (16.75 days after the burst). Our images have 3-sigma detection limits of u > 26.1, g > 26.4, r > 25.9, i > 25.6, and z > 24.7 mag as compared to SDSS field stars (all the magnitudes in this GCN are in the AB system). Within the refined XRT error box (Campana et al., GCN 41249) we clearly detect the two galaxies mentioned by Malesani et al. (GCN 41279), the brightest of which has been proposed as the host of GRB 250806A and has a measured redshift of 0.367 (Sevilla et al., GCN 41499). Under the assumption that the GRB is indeed associated with this galaxy, its low redshift prompted us to perform a search for a possible emerging supernova (SN). The time of our observation would correspond to 14.7 days after the burst in the rest frame, close to the time of expected maximum light. No other significant new source is detected within the XRT error box beyond the mentioned galaxies. Image subtraction with respect to the Legacy Survey (LS) does not reveal any significant residuals, although we note that the reference images are significantly shallower than our data. A deeper search for the SN component will require obtaining deeper templates once the possible SN has faded away. Assuming as limits for the subtraction images the depth of the Legacy Survey, we would not be detecting a SN component down to r > 25.0 mag and i > 24.5 mag. At a redshift of 0.367, this is equivalent to absolute magnitudes of M_4500AA (g-band) > -16.1 and M_5500AA (V-band) > -16.6, or approximately 2.7 magnitudes fainter than SN 1998bw in each of these bands. This could indicate a SN intrinsically fainter than SN 1998bw by a comparable amount, or might indicate line-of-sight extinction of A_V > 2.7 mag. The latter option would be consistent with the lack of optical/NIR afterglow detection (Wu et al., GCN 41244; Fortin et al., GCN 41245; Freeberg et al., GCN 41247; Xin et al., GCN 41250; Zheng et al., GCN 41251; Schneider et al., GCN 41253; Malesani et al., GCN 41279; Pankov et al., GCN 41285). As an alternative, the galaxy at z = 0.367 might be of course a chance association, and the GRB might be simply further away. View this GCN Circular online at https://gcn.nasa.gov/circulars/41550. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39613] EP250821a: Gemini GMOS Redshift Confirmation
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41549 SUBJECT: EP250821a: Gemini GMOS Redshift Confirmation DATE: 25/08/26 15:49:43 GMT FROM: Brendan O'Connor at Carnegie Mellon University <boconno2(a)andrew.cmu.edu> Brendan O'Connor (CMU), Xander Hall (CMU), Antonella Palmese (CMU) report on behalf of a larger collaboration: We observed the location of EP250821a (Hu et al. GCN 41459; Liang et al., GCN 41467) with the Gemini GMOS-S spectrograph starting on 2025-08-26 at 01:53:43 UT. Our spectra cover wavelengths 575 to 1060 nm and consist of 4x1200 s exposures using the R400 grating. In a preliminary reduction, at the location of the optical counterpart (Dichiara et al., GCN 41469; Li et al. GCN 41470; Yao et al. GCN 41485), we clearly detect a bright trace. We detect multiple emission lines from the underlying host galaxy, including [OII], [OIII], Hbeta, [NII], and Halpha, at a consistent redshift of z=0.577. This confirms the previous spectroscopic redshift obtained by the VLT (An et al., GCN 41490). We thank the staff of the Gemini Observatory, in particular Karleyne Silva, Cinthya Rodriguez, Aleksandar Cikota, Emanuele Farina, for assistance with scheduling and obtaining these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/41549. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39612] LIGO/Virgo/KAGRA S250818k: SAO RAS BTA z-band observations of AT2025ulz
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41548 SUBJECT: LIGO/Virgo/KAGRA S250818k: SAO RAS BTA z-band observations of AT2025ulz DATE: 25/08/26 11:49:10 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), S. Kotov (SAO RAS), A. Volnova (IKI) report on behalf of the IKI-GRB-FuN collaboration: We observed the field of an optical transient AT2025ulz detected by ZTF (Stein et. al, GCN 41414) in the localization region of a candidate binary neutron star merger S250818k (LVK, GCN 41437). The observations with BTA 6-meter telescope of SAO RAS started on 2025-08-22 at 17:18:46 UT, i.e. ~4.67 days since LVK trigger. We obtained 2.4 ks exposure in the z'-band using the Scorpio-2 multi-mode focal reducer (Afanasiev & Moiseev, 2011, BaltA, 20, 363) installed in the prime focus of the telescope. We applied image subtraction using LS DR10 z-band image as reference. We clearly detect the optical source in the difference image at the position given by ZTF (Stein et. al, GCN 41414). The preliminary photometry of the source is presented below: Date UTstart Exptime,s T-T0,days Filter OT Err UL(3sigma) FWHM," ---------- -------- ------- ------- -- ----- ---- ---- --- 2025-08-22 17:18:46 2400.13 4.67963 z' 24.09 0.24 24.3 1.8 The photometry was calibrated using comparison stars from SDSS-DR12 and not corrected for the Galactic extinction. The OT was also followed by (Busmann et. al, GCN 41421; Hall et. al, GCN 41433; Karambelkar et. al, GCN 41436; Nicholl et. al, GCN 41439; Srivastav et. al, GCN 41451; O’Connor et. al, GCN 41452; Gillanders et. al, GCN 41454; Mo et. al, GCN 41456; Liu et. al, GCN 41461; Ackley et. al, GCN 41468; Klose et. al, GCN 41474; Banerjee et. al, GCN 41476; Perley et. al, GCN 41480; D'Avanzo et. al, GCN 41489; Malesani et. al, GCN 41492; Smartt et. al, GCN 41493; Santos et. al, GCN 41501; Becerra et. al, GCN 41502; An et. al, GCN 41503; Passaleva et. al, GCN 41504; Taguchi et. al, GCN 41505; Troja et. al, GCN 41506; Freeburn et. al, GCN 41507; Angulo et. al, GCN 41518; Antier et. al, GCN 41519; Banerjee et. al, GCN 41532; Lipunov et. al, GCN 41534; Busmann et. al, GCN 41535; Kasliwal et. al, GCN 41538; Gillanders et. al, GCN 41540; Becerra et. al, GCN 41544). We note that our measurements may be affected during image subtraction and should be considered as a lower limit on the source brightness. View this GCN Circular online at https://gcn.nasa.gov/circulars/41548. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39611] Fermi trigger No 777883624: Global MASTER-Net observations report
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41547 SUBJECT: Fermi trigger No 777883624: Global MASTER-Net observations report DATE: 25/08/26 08:30:49 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), 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) started inspect of the Fermi GRB250826.28 (trigger No 777883624,23h 40m 02.40s , -64d 12m 00.0s, R=4.94) errorbox 90 sec after notice time and 132 sec after trigger time at 2025-08-26 06:49:11 UT, with upper limit up to 20.3 mag. The observations began at zenith distance = 34 deg. The sun altitude is -53.0 deg. The galactic latitude b = -52 deg., longitude l = 315 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2977396 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 147 | 2025-08-26 06:49:11 | MASTER-OAFA | (23h 39m 27.05s , -64d 23m 49.4s) | C | 30 | 19.9 | 183 | 2025-08-26 06:49:47 | MASTER-OAFA | (23h 39m 27.12s , -64d 23m 50.0s) | C | 30 | 19.9 | 224 | 2025-08-26 06:50:23 | MASTER-OAFA | (23h 39m 27.23s , -64d 23m 50.4s) | C | 40 | 19.9 | 275 | 2025-08-26 06:51:09 | MASTER-OAFA | (23h 39m 27.37s , -64d 23m 50.7s) | C | 50 | 19.9 | 336 | 2025-08-26 06:52:05 | MASTER-OAFA | (23h 39m 27.59s , -64d 23m 50.9s) | C | 60 | 20.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/41547. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39610] Fermi Gamma-ray Burst Monitor trigger 777883624/250826283 is not a GRB
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41546 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 777883624/250826283 is not a GRB DATE: 25/08/26 08:16:30 GMT FROM: Rushikesh Sonawane at IISER, TVM <rushikesh23(a)iisertvm.ac.in> R. Sonawane (IISER, TVM) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 777883624/250826283 at 06:46:59.09 UT on 26 August 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local particles." View this GCN Circular online at https://gcn.nasa.gov/circulars/41546. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39609] GRB 250826A: Fermi GBM Final Real-time Localization
by GCN Circulars 26 Aug '25

26 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41545 SUBJECT: GRB 250826A: Fermi GBM Final Real-time Localization DATE: 25/08/26 07:34:29 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 07:24:01 UT on 26 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250826A (trigger 777885846.969916 / 250826308). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 141.8, Dec = 34.7 (J2000 degrees, equivalent to J2000 09h 27m, 34d 42'), with a statistical uncertainty of 3.6 degrees. The angle from the Fermi LAT boresight is 40.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250826308/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250826308/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250826308/… View this GCN Circular online at https://gcn.nasa.gov/circulars/41545. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39608] LIGO/Virgo/KAGRA S250818k: GTC/OSIRIS Confirmation of Rebrightening of AT2025ulz
by GCN Circulars 25 Aug '25

25 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41544 SUBJECT: LIGO/Virgo/KAGRA S250818k: GTC/OSIRIS Confirmation of Rebrightening of AT2025ulz DATE: 25/08/25 19:06:17 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra(a)roma2.infn.it> Rosa L. Becerra (U Rome), Yuhan Yang (U Rome), Alan M. Watson (UNAM), Eleonora Troja (U Rome) and William H. Lee (UNAM) report on behalf of a larger team: We continued monitoring AT2025ulz/ZTF25abjmnps, initially reported by Stein et al. (GCN 41414) within the localization region of the candidate gravitational wave event S250818k (LVK Collaboration, GCN 41437, 41440), using the OSIRIS instrument mounted on the GTC telescope. Our observations commenced at 2025-08-24 21:18 UTC (6.8 days after the trigger) and were carried out in the g, r, i and z filters at an average airmass of ~1.3. By comparison with our first epoch at T+3.9 days (Becerra et al., GCN 41502), we confirm a significant rebrightening in both the r and z bands, measuring: delta_r = 0.9 +/- 0.3 delta_z = 0.6 +/- 0.1 Our observations are in agreement with the rebrightening observed in i-band (Freeburn et al. GCN 41507; Angulo et al. GCN 41518; Busmann et al. GCN 41535), a behavior that is not expected for kilonova emission. Further observations are planned. We thank the staff at the GTC, especially Antonio García Rodríguez, Antonio Marante Barreto, and Antonio Cabrera for the rapid execution of these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/41544. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39607] Fermi GRB 250824B: Global MASTER-Net observations report
by GCN Circulars 25 Aug '25

25 Aug '25

TITLE: GCN CIRCULAR NUMBER: 41543 SUBJECT: Fermi GRB 250824B: Global MASTER-Net observations report DATE: 25/08/25 17:16:08 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), 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) started inspect of the Fermi GRB 250824B ( Fermi GBM team, GCN 41527) errorbox 33953 sec after notice time and 33960 sec after trigger time at 2025-08-24 23:04:13 UT, with upper limit up to 23.0 mag. Observations started at twilight. The observations began at zenith distance = 4 deg. The sun altitude is -11.4 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250824B errorbox 1 days 11812 sec after notice time and 1 days 11818 sec after trigger time at 2025-08-25 16:55:12 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 3 deg. The sun altitude is -8.7 deg. The galactic latitude b = 8 deg., longitude l = 346 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2976525 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 33990 | 2025-08-24 23:04:13 | MASTER-OAFA | (16h 35m 33.85s , -34d 39m 23.0s) | C | 60 | 17.6 | 34050 | 2025-08-24 23:04:13 | MASTER-OAFA | (16h 35m 33.85s , -34d 39m 23.0s) | C | 180 | 18.0 | Coadd 34067 | 2025-08-24 23:05:30 | MASTER-OAFA | (16h 45m 12.85s , -34d 40m 49.9s) | C | 60 | 17.6 | 34127 | 2025-08-24 23:05:30 | MASTER-OAFA | (16h 45m 12.85s , -34d 40m 50.0s) | C | 180 | 18.3 | Coadd 34143 | 2025-08-24 23:06:46 | MASTER-OAFA | (16h 35m 35.17s , -34d 40m 03.8s) | C | 60 | 17.7 | 34218 | 2025-08-24 23:08:02 | MASTER-OAFA | (16h 45m 15.27s , -34d 38m 56.7s) | C | 60 | 17.8 | 34294 | 2025-08-24 23:09:18 | MASTER-OAFA | (16h 35m 31.47s , -34d 40m 14.9s) | C | 60 | 17.7 | 34372 | 2025-08-24 23:10:35 | MASTER-OAFA | (16h 21m 40.27s , -36d 32m 28.1s) | C | 60 | 18.2 | 34448 | 2025-08-24 23:11:52 | MASTER-OAFA | (16h 31m 38.29s , -36d 31m 55.2s) | C | 60 | 18.0 | 34525 | 2025-08-24 23:13:08 | MASTER-OAFA | (16h 21m 47.37s , -36d 32m 26.9s) | C | 60 | 18.3 | 34601 | 2025-08-24 23:14:25 | MASTER-OAFA | (16h 31m 38.55s , -36d 33m 53.4s) | C | 60 | 18.0 | 34677 | 2025-08-24 23:15:40 | MASTER-OAFA | (16h 21m 47.32s , -36d 32m 56.9s) | C | 60 | 18.2 | 34752 | 2025-08-24 23:16:55 | MASTER-OAFA | (16h 17m 03.71s , -34d 39m 09.2s) | C | 60 | 18.4 | 34828 | 2025-08-24 23:18:11 | MASTER-OAFA | (16h 26m 50.74s , -34d 38m 10.8s) | C | 60 | 18.2 | 34903 | 2025-08-24 23:19:27 | MASTER-OAFA | (16h 17m 01.48s , -34d 38m 26.9s) | C | 60 | 18.1 | 34980 | 2025-08-24 23:20:43 | MASTER-OAFA | (16h 26m 45.27s , -34d 37m 50.9s) | C | 60 | 18.1 | 35056 | 2025-08-24 23:21:59 | MASTER-OAFA | (16h 17m 06.81s , -34d 38m 26.1s) | C | 60 | 18.4 | 35132 | 2025-08-24 23:23:15 | MASTER-OAFA | (16h 31m 46.56s , -32d 46m 14.8s) | C | 60 | 18.3 | 35192 | 2025-08-24 23:23:15 | MASTER-OAFA | (16h 31m 46.56s , -32d 46m 14.8s) | C | 180 | 18.4 | Coadd 35207 | 2025-08-24 23:24:31 | MASTER-OAFA | (16h 41m 14.46s , -32d 44m 51.6s) | C | 60 | 17.9 | 35267 | 2025-08-24 23:24:31 | MASTER-OAFA | (16h 41m 14.46s , -32d 44m 51.7s) | C | 180 | 18.0 | Coadd 35284 | 2025-08-24 23:25:47 | MASTER-OAFA | (16h 31m 43.58s , -32d 46m 05.1s) | C | 60 | 18.2 | 35359 | 2025-08-24 23:27:03 | MASTER-OAFA | (16h 41m 17.58s , -32d 44m 52.4s) | C | 60 | 17.9 | 35436 | 2025-08-24 23:28:19 | MASTER-OAFA | (16h 31m 40.60s , -32d 45m 16.7s) | C | 60 | 18.2 | 35513 | 2025-08-24 23:29:37 | MASTER-OAFA | (16h 13m 41.38s , -32d 44m 35.6s) | C | 60 | 18.4 | 35591 | 2025-08-24 23:30:54 | MASTER-OAFA | (16h 23m 06.58s , -32d 45m 55.9s) | C | 60 | 18.3 | 35667 | 2025-08-24 23:32:10 | MASTER-OAFA | (16h 13m 42.72s , -32d 45m 24.3s) | C | 60 | 18.2 | 35743 | 2025-08-24 23:33:26 | MASTER-OAFA | (16h 23m 10.45s , -32d 44m 24.2s) | C | 60 | 18.3 | 35819 | 2025-08-24 23:34:42 | MASTER-OAFA | (16h 13m 40.11s , -32d 45m 05.5s) | C | 60 | 18.1 | 35896 | 2025-08-24 23:35:59 | MASTER-OAFA | (16h 29m 04.22s , -30d 51m 29.6s) | C | 60 | 18.2 | 35956 | 2025-08-24 23:35:59 | MASTER-OAFA | (16h 29m 04.21s , -30d 51m 29.6s) | C | 180 | 18.8 | Coadd 35971 | 2025-08-24 23:37:14 | MASTER-OAFA | (16h 38m 25.02s , -30d 50m 49.4s) | C | 60 | 17.8 | 36046 | 2025-08-24 23:38:30 | MASTER-OAFA | (16h 29m 11.62s , -30d 51m 29.4s) | C | 60 | 18.2 | 36121 | 2025-08-24 23:39:45 | MASTER-OAFA | (16h 38m 23.42s , -30d 52m 48.9s) | C | 60 | 17.6 | 36197 | 2025-08-24 23:41:01 | MASTER-OAFA | (16h 29m 11.50s , -30d 52m 17.2s) | C | 60 | 18.1 | 36273 | 2025-08-24 23:42:16 | MASTER-OAFA | (16h 45m 18.86s , -34d 38m 42.1s) | C | 60 | 17.6 | 36348 | 2025-08-24 23:43:31 | MASTER-OAFA | (16h 45m 19.00s , -34d 40m 22.5s) | C | 60 | 17.6 | 36425 | 2025-08-24 23:44:48 | MASTER-OAFA | (16h 45m 21.36s , -34d 38m 28.6s) | C | 60 | 17.6 | 36501 | 2025-08-24 23:46:04 | MASTER-OAFA | (16h 35m 33.55s , -34d 39m 01.5s) | C | 60 | 17.5 | 36575 | 2025-08-24 23:47:19 | MASTER-OAFA | (16h 35m 33.38s , -34d 38m 01.0s) | C | 60 | 17.5 | 36649 | 2025-08-24 23:48:32 | MASTER-OAFA | (16h 35m 38.91s , -34d 39m 00.9s) | C | 60 | 17.5 | 36727 | 2025-08-24 23:49:50 | MASTER-OAFA | (16h 31m 43.42s , -36d 33m 30.7s) | C | 60 | 17.6 | 36801 | 2025-08-24 23:51:04 | MASTER-OAFA | (16h 31m 50.46s , -36d 33m 30.5s) | C | 60 | 17.7 | 36861 | 2025-08-24 23:51:04 | MASTER-OAFA | (16h 31m 50.46s , -36d 33m 30.6s) | C | 180 | 18.3 | Coadd 36877 | 2025-08-24 23:52:21 | MASTER-OAFA | (16h 31m 47.08s , -36d 31m 35.2s) | C | 60 | 17.7 | 36952 | 2025-08-24 23:53:36 | MASTER-OAFA | (16h 21m 49.89s , -36d 32m 43.5s) | C | 60 | 18.2 | 37027 | 2025-08-24 23:54:50 | MASTER-OAFA | (16h 21m 52.23s , -36d 31m 13.0s) | C | 60 | 18.0 | 37103 | 2025-08-24 23:56:07 | MASTER-OAFA | (16h 21m 46.32s , -36d 32m 04.0s) | C | 60 | 18.0 | 37179 | 2025-08-24 23:57:22 | MASTER-OAFA | (16h 26m 49.33s , -34d 37m 37.5s) | C | 60 | 17.8 | 37253 | 2025-08-24 23:58:36 | MASTER-OAFA | (16h 26m 54.89s , -34d 38m 37.4s) | C | 60 | 17.8 | 37330 | 2025-08-24 23:59:54 | MASTER-OAFA | (16h 26m 49.70s , -34d 39m 36.7s) | C | 60 | 17.9 | 37406 | 2025-08-25 00:01:09 | MASTER-OAFA | (16h 17m 11.71s , -34d 39m 08.6s) | C | 60 | 18.0 | 37483 | 2025-08-25 00:02:26 | MASTER-OAFA | (16h 17m 09.75s , -34d 37m 39.5s) | C | 60 | 18.1 | 37560 | 2025-08-25 00:03:44 | MASTER-OAFA | (16h 17m 09.94s , -34d 39m 03.3s) | C | 60 | 18.2 | 37638 | 2025-08-25 00:05:01 | MASTER-OAFA | (16h 41m 20.88s , -32d 44m 38.6s) | C | 60 | 17.7 | 37716 | 2025-08-25 00:06:19 | MASTER-OAFA | (16h 41m 15.67s , -32d 45m 31.0s) | C | 60 | 17.7 | 37776 | 2025-08-25 00:06:19 | MASTER-OAFA | (16h 41m 15.62s , -32d 45m 30.6s) | C | 180 | 17.9 | Coadd 37794 | 2025-08-25 00:07:37 | MASTER-OAFA | (16h 41m 15.13s , -32d 44m 30.9s) | C | 60 | 17.8 | 37870 | 2025-08-25 00:08:53 | MASTER-OAFA | (16h 31m 52.02s , -32d 45m 11.1s) | C | 60 | 18.2 | 37945 | 2025-08-25 00:10:08 | MASTER-OAFA | (16h 31m 45.37s , -32d 46m 10.7s) | C | 60 | 18.3 | 38021 | 2025-08-25 00:11:24 | MASTER-OAFA | (16h 31m 52.37s , -32d 45m 55.4s) | C | 60 | 18.2 | 38097 | 2025-08-25 00:12:41 | MASTER-OAFA | (16h 23m 15.22s , -32d 44m 03.7s) | C | 60 | 18.4 | 38172 | 2025-08-25 00:13:55 | MASTER-OAFA | (16h 23m 15.38s , -32d 45m 37.0s) | C | 60 | 18.4 | 38246 | 2025-08-25 00:15:09 | MASTER-OAFA | (16h 23m 18.45s , -32d 44m 02.9s) | C | 60 | 18.4 | 38322 | 2025-08-25 00:16:26 | MASTER-OAFA | (16h 13m 42.34s , -32d 44m 36.1s) | C | 60 | 18.5 | 38382 | 2025-08-25 00:16:26 | MASTER-OAFA | (16h 13m 42.34s , -32d 44m 36.2s) | C | 180 | 19.3 | Coadd 38397 | 2025-08-25 00:17:40 | MASTER-OAFA | (16h 13m 42.50s , -32d 43m 36.5s) | C | 60 | 18.5 | 38472 | 2025-08-25 00:18:55 | MASTER-OAFA | (16h 13m 48.41s , -32d 44m 36.7s) | C | 60 | 18.6 | 38551 | 2025-08-25 00:20:14 | MASTER-OAFA | (16h 38m 28.04s , -30d 52m 51.3s) | C | 60 | 18.1 | 38629 | 2025-08-25 00:21:32 | MASTER-OAFA | (16h 38m 35.38s , -30d 52m 26.8s) | C | 60 | 18.1 | 38707 | 2025-08-25 00:22:50 | MASTER-OAFA | (16h 38m 31.94s , -30d 51m 07.4s) | C | 60 | 18.1 | 38782 | 2025-08-25 00:24:05 | MASTER-OAFA | (16h 29m 12.64s , -30d 52m 29.6s) | C | 60 | 19.0 | 38860 | 2025-08-25 00:25:24 | MASTER-OAFA | (16h 29m 15.31s , -30d 50m 59.5s) | C | 60 | 19.1 | 38920 | 2025-08-25 00:25:24 | MASTER-OAFA | (16h 29m 15.31s , -30d 50m 59.5s) | C | 180 | 18.7 | Coadd 38936 | 2025-08-25 00:26:39 | MASTER-OAFA | (16h 29m 10.42s , -30d 51m 37.5s) | C | 60 | 19.2 | 39014 | 2025-08-25 00:27:57 | MASTER-OAFA | (16h 45m 23.00s , -34d 38m 11.4s) | C | 60 | 18.4 | 39087 | 2025-08-25 00:29:10 | MASTER-OAFA | (16h 45m 28.91s , -34d 39m 11.4s) | C | 60 | 18.4 | 39147 | 2025-08-25 00:29:10 | MASTER-OAFA | (16h 45m 28.91s , -34d 39m 11.4s) | C | 180 | 18.0 | Coadd 39165 | 2025-08-25 00:30:28 | MASTER-OAFA | (16h 45m 22.63s , -34d 40m 11.1s) | C | 60 | 18.4 | 39240 | 2025-08-25 00:31:43 | MASTER-OAFA | (16h 35m 44.77s , -34d 39m 41.5s) | C | 60 | 18.5 | 39318 | 2025-08-25 00:33:01 | MASTER-OAFA | (16h 35m 42.48s , -34d 37m 51.6s) | C | 60 | 18.5 | 39393 | 2025-08-25 00:34:17 | MASTER-OAFA | (16h 35m 42.66s , -34d 39m 40.6s) | C | 60 | 18.5 | 39468 | 2025-08-25 00:35:31 | MASTER-OAFA | (16h 31m 57.69s , -36d 31m 21.2s) | C | 60 | 18.6 | 39543 | 2025-08-25 00:36:47 | MASTER-OAFA | (16h 31m 51.08s , -36d 32m 13.9s) | C | 60 | 18.6 | 39621 | 2025-08-25 00:38:04 | MASTER-OAFA | (16h 31m 51.67s , -36d 31m 13.9s) | C | 60 | 18.6 | 39741 | 2025-08-25 00:40:04 | MASTER-OAFA | (16h 22m 00.21s , -36d 43m 40.2s) | C | 60 | 18.7 | 39818 | 2025-08-25 00:41:22 | MASTER-OAFA | (16h 21m 54.49s , -36d 44m 39.5s) | C | 60 | 18.7 | 39895 | 2025-08-25 00:42:38 | MASTER-OAFA | (16h 22m 00.31s , -36d 44m 11.6s) | C | 60 | 18.7 | 39971 | 2025-08-25 00:43:54 | MASTER-OAFA | (16h 27m 00.83s , -34d 49m 15.4s) | C | 60 | 23.0 | 40046 | 2025-08-25 00:45:09 | MASTER-OAFA | (16h 27m 00.88s , -34d 50m 21.8s) | C | 60 | 18.6 | 40122 | 2025-08-25 00:46:25 | MASTER-OAFA | (16h 27m 03.85s , -34d 49m 14.4s) | C | 60 | 23.0 | 40197 | 2025-08-25 00:47:41 | MASTER-OAFA | (16h 17m 14.37s , -34d 49m 23.6s) | C | 60 | 18.7 | 40275 | 2025-08-25 00:48:58 | MASTER-OAFA | (16h 17m 14.82s , -34d 48m 22.8s) | C | 60 | 18.7 | 40350 | 2025-08-25 00:50:13 | MASTER-OAFA | (16h 17m 19.54s , -34d 49m 22.7s) | C | 60 | 18.7 | 40428 | 2025-08-25 00:51:32 | MASTER-OAFA | (16h 41m 24.66s , -32d 57m 24.9s) | C | 60 | 18.5 | 40503 | 2025-08-25 00:52:46 | MASTER-OAFA | (16h 41m 30.48s , -32d 56m 55.6s) | C | 60 | 18.4 | 40582 | 2025-08-25 00:54:06 | MASTER-OAFA | (16h 41m 28.42s , -32d 55m 43.1s) | C | 60 | 18.5 | 40659 | 2025-08-25 00:55:23 | MASTER-OAFA | (16h 31m 57.16s , -32d 56m 30.8s) | C | 60 | 19.0 | 40719 | 2025-08-25 00:55:23 | MASTER-OAFA | (16h 31m 57.16s , -32d 56m 30.8s) | C | 180 | 19.5 | Coadd 40737 | 2025-08-25 00:56:40 | MASTER-OAFA | (16h 31m 59.77s , -32d 55m 15.2s) | C | 60 | 19.2 | 40813 | 2025-08-25 00:57:56 | MASTER-OAFA | (16h 31m 54.45s , -32d 55m 55.8s) | C | 60 | 19.0 | 40889 | 2025-08-25 00:59:12 | MASTER-OAFA | (16h 23m 20.33s , -32d 54m 34.1s) | C | 60 | 19.5 | 40964 | 2025-08-25 01:00:27 | MASTER-OAFA | (16h 23m 27.22s , -32d 55m 34.0s) | C | 60 | 19.5 | 41024 | 2025-08-25 01:00:27 | MASTER-OAFA | (16h 23m 27.22s , -32d 55m 34.1s) | C | 180 | 19.8 | Coadd 41049 | 2025-08-25 01:01:52 | MASTER-OAFA | (16h 23m 20.82s , -32d 56m 33.3s) | C | 60 | 19.5 | 41124 | 2025-08-25 01:03:07 | MASTER-OAFA | (16h 13m 54.25s , -32d 56m 10.7s) | C | 60 | 19.4 | 41202 | 2025-08-25 01:04:25 | MASTER-OAFA | (16h 13m 52.54s , -32d 54m 14.5s) | C | 60 | 19.4 | 41277 | 2025-08-25 01:05:40 | MASTER-OAFA | (16h 13m 52.58s , -32d 56m 07.8s) | C | 60 | 19.3 | 41354 | 2025-08-25 01:06:57 | MASTER-OAFA | (16h 38m 43.17s , -31d 01m 29.4s) | C | 60 | 18.5 | 41430 | 2025-08-25 01:08:13 | MASTER-OAFA | (16h 38m 38.55s , -31d 02m 09.8s) | C | 60 | 18.5 | 41507 | 2025-08-25 01:09:30 | MASTER-OAFA | (16h 38m 38.27s , -31d 01m 09.0s) | C | 60 | 18.5 | 41582 | 2025-08-25 01:10:45 | MASTER-OAFA | (16h 29m 24.82s , -31d 01m 46.2s) | C | 60 | 19.5 | 41661 | 2025-08-25 01:12:04 | MASTER-OAFA | (16h 29m 19.49s , -31d 02m 45.6s) | C | 60 | 19.6 | 41740 | 2025-08-25 01:13:23 | MASTER-OAFA | (16h 29m 24.61s , -31d 02m 32.0s) | C | 60 | 19.5 | 41820 | 2025-08-25 01:14:43 | MASTER-OAFA | (16h 45m 32.41s , -34d 49m 49.3s) | C | 60 | 18.8 | 41895 | 2025-08-25 01:15:59 | MASTER-OAFA | (16h 45m 32.47s , -34d 51m 02.0s) | C | 60 | 18.8 | 41972 | 2025-08-25 01:17:15 | MASTER-OAFA | (16h 45m 35.46s , -34d 49m 48.7s) | C | 60 | 18.8 | 42048 | 2025-08-25 01:18:32 | MASTER-OAFA | (16h 31m 54.17s , -36d 43m 48.6s) | C | 60 | 18.6 | 42124 | 2025-08-25 01:19:48 | MASTER-OAFA | (16h 31m 54.28s , -36d 42m 48.2s) | C | 60 | 18.6 | 42200 | 2025-08-25 01:21:04 | MASTER-OAFA | (16h 32m 02.27s , -36d 43m 48.4s) | C | 60 | 18.6 | 42277 | 2025-08-25 01:22:21 | MASTER-OAFA | (16h 27m 00.81s , -34d 50m 36.1s) | C | 60 | 23.0 | 42352 | 2025-08-25 01:23:35 | MASTER-OAFA | (16h 27m 05.57s , -34d 50m 26.4s) | C | 60 | 23.0 | 42429 | 2025-08-25 01:24:52 | MASTER-OAFA | (16h 27m 03.53s , -34d 48m 58.9s) | C | 60 | 23.0 | 42505 | 2025-08-25 01:26:08 | MASTER-OAFA | (16h 41m 30.59s , -32d 57m 02.3s) | C | 60 | 18.4 | 42580 | 2025-08-25 01:27:24 | MASTER-OAFA | (16h 41m 33.91s , -32d 55m 37.4s) | C | 60 | 18.5 | 42659 | 2025-08-25 01:28:42 | MASTER-OAFA | (16h 41m 26.77s , -32d 56m 08.2s) | C | 60 | 18.5 | 42738 | 2025-08-25 01:30:02 | MASTER-OAFA | (16h 11m 42.80s , -31d 01m 05.8s) | C | 60 | 19.6 | 42814 | 2025-08-25 01:31:17 | MASTER-OAFA | (16h 20m 56.77s , -31d 02m 24.3s) | C | 60 | 19.6 | 42890 | 2025-08-25 01:32:33 | MASTER-OAFA | (16h 11m 42.58s , -31d 01m 52.9s) | C | 60 | 19.6 | 42966 | 2025-08-25 01:33:49 | MASTER-OAFA | (16h 20m 59.81s , -31d 00m 51.5s) | C | 60 | 19.6 | 43042 | 2025-08-25 01:35:05 | MASTER-OAFA | (16h 11m 39.84s , -31d 01m 54.5s) | C | 60 | 19.6 | 43121 | 2025-08-25 01:36:24 | MASTER-OAFA | (16h 23m 28.18s , -32d 54m 32.8s) | C | 60 | 19.5 | 43196 | 2025-08-25 01:37:39 | MASTER-OAFA | (16h 23m 22.49s , -32d 55m 28.0s) | C | 60 | 19.5 | 43284 | 2025-08-25 01:39:07 | MASTER-OAFA | (16h 23m 22.23s , -32d 54m 27.9s) | C | 60 | 19.5 | 43362 | 2025-08-25 01:40:25 | MASTER-OAFA | (16h 38m 45.90s , -31d 02m 01.6s) | C | 60 | 18.3 | 43435 | 2025-08-25 01:41:39 | MASTER-OAFA | (16h 38m 40.56s , -31d 03m 01.5s) | C | 60 | 18.4 | 43513 | 2025-08-25 01:42:56 | MASTER-OAFA | (16h 38m 46.40s , -31d 02m 33.2s) | C | 60 | 18.4 | 44833 | 2025-08-25 02:04:56 | MASTER-OAFA | (16h 21m 04.33s , -31d 00m 58.7s) | C | 60 | 19.5 | 44910 | 2025-08-25 02:06:13 | MASTER-OAFA | (16h 20m 58.26s , -31d 01m 38.5s) | C | 60 | 19.4 | 44970 | 2025-08-25 02:06:13 | MASTER-OAFA | (16h 20m 58.26s , -31d 01m 38.6s) | C | 180 | 19.6 | Coadd 44986 | 2025-08-25 02:07:29 | MASTER-OAFA | (16h 20m 58.30s , -31d 00m 38.4s) | C | 60 | 19.5 | 45063 | 2025-08-25 02:08:47 | MASTER-OAFA | (16h 11m 44.82s , -31d 01m 23.1s) | C | 60 | 19.5 | 45138 | 2025-08-25 02:10:02 | MASTER-OAFA | (16h 11m 38.38s , -31d 02m 23.4s) | C | 60 | 19.4 | 45214 | 2025-08-25 02:11:17 | MASTER-OAFA | (16h 11m 44.92s , -31d 02m 18.3s) | C | 60 | 19.5 | 47426 | 2025-08-25 02:48:09 | MASTER-OAFA | (16h 21m 03.31s , -31d 02m 28.1s) | C | 60 | 19.3 | 47503 | 2025-08-25 02:49:26 | MASTER-OAFA | (16h 21m 06.15s , -31d 01m 10.4s) | C | 60 | 19.5 | 47579 | 2025-08-25 02:50:42 | MASTER-OAFA | (16h 11m 39.75s , -31d 01m 45.0s) | C | 60 | 19.4 | 47653 | 2025-08-25 02:51:57 | MASTER-OAFA | (16h 11m 41.24s , -31d 00m 45.8s) | C | 60 | 19.4 | 47729 | 2025-08-25 02:53:13 | MASTER-OAFA | (16h 11m 47.36s , -31d 01m 46.3s) | C | 60 | 19.4 | 49692 | 2025-08-25 03:25:56 | MASTER-OAFA | (16h 21m 01.37s , -31d 03m 21.4s) | C | 60 | 18.6 | 49768 | 2025-08-25 03:27:11 | MASTER-OAFA | (16h 21m 07.46s , -31d 03m 05.3s) | C | 60 | 18.5 | 49844 | 2025-08-25 03:28:27 | MASTER-OAFA | (16h 21m 05.27s , -31d 01m 47.1s) | C | 60 | 18.6 | 98249 | 2025-08-25 16:55:12 | MASTER-SAAO | (16h 34m 21.01s , -35d 04m 06.8s) | C | 60 | 16.5 | 98339 | 2025-08-25 16:56:43 | MASTER-SAAO | (16h 43m 57.78s , -35d 05m 36.2s) | C | 60 | 16.7 | 98431 | 2025-08-25 16:58:14 | MASTER-SAAO | (16h 20m 34.54s , -36d 56m 18.5s) | C | 60 | 17.2 | 98521 | 2025-08-25 16:59:44 | MASTER-SAAO | (16h 30m 30.26s , -36d 58m 30.6s) | C | 60 | 17.2 | 98618 | 2025-08-25 17:01:21 | MASTER-SAAO | (16h 15m 54.89s , -35d 02m 54.0s) | C | 60 | 17.4 | 98710 | 2025-08-25 17:02:53 | MASTER-SAAO | (16h 25m 35.36s , -35d 02m 24.3s) | C | 60 | 17.5 | 98800 | 2025-08-25 17:04:24 | MASTER-SAAO | (16h 30m 32.11s , -33d 10m 42.4s) | C | 60 | 17.5 | 98891 | 2025-08-25 17:05:54 | MASTER-SAAO | (16h 40m 07.88s , -33d 10m 54.7s) | C | 60 | 17.5 | 98980 | 2025-08-25 17:07:24 | MASTER-SAAO | (16h 34m 23.67s , -35d 02m 57.0s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/41543. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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