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[vsnet-grb-info 42139] GRID detection of GRB 260312B
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44018 SUBJECT: GRID detection of GRB 260312B DATE: 26/03/15 11:40:03 GMT FROM: GRID Student Team at Tsinghua University <grid(a)tsinghua.edu.cn> Fanqing Zhou, Longhao Li, Chenyu Wang report on behalf of the GRID Collaboration: GRID-11B reports the detection of the long-duration GRB 260312B, which was also detected by Fermi GBM (GCN Circular 43969), MASTER-Kislovodsk (GCN Circular 43973), BALROG (GCN Circular 43970), Glowbug (GCN Circular 43976), AstroSat CZTI (GCN Circular 43989). The event was triggered with GRID on 2026-03-12 at 09:46:46 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 11.8+/-2.3 seconds. The GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB260312B/GRID_260…. GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4. View this GCN Circular online at https://gcn.nasa.gov/circulars/44018. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42138] IceCube-260315A - IceCube observation of a high-energy neutrino candidate track-like event
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44017 SUBJECT: IceCube-260315A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 26/03/15 11:21:27 GMT FROM: A. Zegarelli at Ruhr University Bochum <azegarelli(a)icecube.wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 26-03-15 at 02:19:06.60 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_BRONZE alert stream. The average astrophysical neutrino purity for Bronze alerts is 30%. This alert has an estimated false alarm rate of 3.3512 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/142272_46886533.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 26-03-15 Time: 02:19:06.60 UT RA: 175.69 (+0.49/-0.46 deg 90% PSF containment) J2000 Dec: -1.90 (+0.53/-0.51 deg 90% PSF containment) J2000 As announced in GCN Circular 43419 (https://gcn.nasa.gov/circulars/43419) IceCube alert notices for high-energy track alerts are now also streamed via Kafka. IceCube Gold/Bronze track alerts are available on the Kafka topic 'gcn.notices.icecube.gold_bronze_track_alerts'. The probability distribution of the true neutrino direction, allowing the extraction of precise 90% containment regions around the best-fit direction, is now available for revised reconstruction of high-energy track alerts. The corresponding sky map is distributed as a FITS file and follows the explicit naming convention IceCube-YYMMDDX, where YYMMDD indicates the date of the event and X is a letter distinguishing multiple alerts on the same day. The download link is provided through the GCN schema distributed via Kafka. Detailed documentation describing the alert distribution, schemas, and probability maps is available at: https://gcn.nasa.gov/missions/icecube. No known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of this event. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu View this GCN Circular online at https://gcn.nasa.gov/circulars/44017. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42137] EP260314a: refined analysis of the EP-WXT and EP-FXT observations
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44016 SUBJECT: EP260314a: refined analysis of the EP-WXT and EP-FXT observations DATE: 26/03/15 09:29:55 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Yue Wu (NJU), Rui-Zhi Li (YNAO, CAS), Yaqi Zhao (USTC, PRIC) and Hai-Wu Pan (NAOC) on behalf of the Einstein Probe (EP) team: The fast X-ray transient EP260314a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Zhao et al., GCN 44010). The transient was detected immediately when WXT observation started at T0=2026-03-14T22:51:20. The WXT observation lasted for approximately 16 seconds, and was interrupted due to the autonomous follow-up observation. The average WXT 0.5-4 keV spectrum can be fitted with an absorbed power law with a hydrogen column density of 0.54（-0.27/+0.32）×10^22 cm^-2 and a photon index of 1.81(-0.75/+0.83). The derived average unabsorbed 0.5-4 keV flux is 2.14 (-0.55/+1.13) × 10^(-8) erg/s/cm^2. The Follow-up X-ray Telescope (FXT) on board EP observed this source autonomously at 2026-03-14T22:54:51 (UTC, T0+211 s). The exposure time of this observation is 2.9ks. On-ground analysis of the FXT data found an uncatalogued source at R.A., Dec. = 211.8426, -23.4577 (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic), which is consistent with the WXT position. The average 0.5-10 keV spectrum can be fitted with an absorbed power law with a Galactic hydrogen column density of 0.22 (-0.07/+0.07) × 10^22 cm^-2 and a photon index of 2.21 (-0.27/+0.28). The derived average unabsorbed 0.5-10 keV flux is 5.11 (+0.46/-0.41) × 10^(-12) erg/s/cm^2. A follow-up observation with the EP/FXT was planned, and further information will be updated when the telemetry data is received. The optical follow-up observations were performed by Li et al. (GCN 44009), Li et al. (GCN 44013), Lipunov et al. (GCN 44014) and Pérez-García et al. (GCN 44015). We note that the SVOM/VT candidate (Li et al., GCN 44013) is located within the 10 arcsec error circle of EP/FXT. Further multi-band follow-up observations are encouraged to explore the nature of EP260314a. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/44016. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42136] EP260314a: BOOTES-6/DPR optical upper limits at early times
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44015 SUBJECT: EP260314a: BOOTES-6/DPR optical upper limits at early times DATE: 26/03/15 09:27:12 GMT FROM: I. Perez-Garcia at Institute of Astrophysics of Andalusia <ipg(a)iaa.es> I. Pérez-García, E. Fernández-García, M.D. Caballero-García, M. Gritsevich, S. Guziy, R. Sánchez-Ramírez, S.-Y. Wu, and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martín-Carrillo and L. Hanlon (UCD, Ireland), Y.-D. Hu (GXU), D. R. Xiong (Yunnan Observatories of CAS) and C. J. Pérez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report: Following the detection of EP260314a by Einstein Probe (Zhao et al., GCNC 44010), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) responded to this event starting on Mar 14, 23:00:01 UT (~ 8.5 min after trigger) with a 10s clear filter image. No new source is detected at the position of the proposed optical counterpart by SVOM/VT (Li et al., GCNC 44013) up to magnitude 16.3 using Gaia DR3 Gmag magnitude as reference on our first image. Further images were gathered and using ATLAS REFCAT2 as reference (Tonry et al. 2018) we get upper limits of: 18.5 (60s clear, at 23:03 UT), 20.9 (300s clear, at 23:06 UT) and 21.7 (600s clear, at 23:18 UT), in agreement with the upper limit reported by LCO (Li et al. GCNC 44009). We thank the staff at Boyden Observatory for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/44015. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42135] EP260314a: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44014 SUBJECT: EP260314a: Global MASTER-Net observations report DATE: 26/03/15 09:18:43 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 [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP260314a ( EP Team et al., GCN 44010) errorbox 18771 sec after notice time and 31448 sec after trigger time at 2026-03-15 07:35:44 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 10 deg. The sun altitude is -37.3 deg. The galactic latitude b = 36 deg., longitude l = 325 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3187114 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 31478 | 2026-03-15 07:35:44 | MASTER-OAFA | (14h 03m 09.70s , -23d 05m 06.7s) | C | 60 | 20.1 | 31538 | 2026-03-15 07:35:44 | MASTER-OAFA | (14h 03m 09.70s , -23d 05m 06.8s) | C | 180 | 20.4 | Coadd 31555 | 2026-03-15 07:37:01 | MASTER-OAFA | (14h 11m 52.28s , -23d 06m 44.8s) | C | 60 | 20.0 | 31615 | 2026-03-15 07:37:01 | MASTER-OAFA | (14h 11m 52.28s , -23d 06m 44.8s) | C | 180 | 20.4 | Coadd 31632 | 2026-03-15 07:38:17 | MASTER-OAFA | (14h 03m 12.03s , -23d 05m 00.4s) | C | 60 | 20.0 | 31707 | 2026-03-15 07:39:33 | MASTER-OAFA | (14h 11m 49.57s , -23d 06m 01.9s) | C | 60 | 20.0 | 31784 | 2026-03-15 07:40:49 | MASTER-OAFA | (14h 03m 07.51s , -23d 04m 36.7s) | C | 60 | 20.0 | 33575 | 2026-03-15 08:10:40 | MASTER-OAFA | (14h 11m 51.09s , -23d 04m 19.3s) | C | 60 | 20.0 | 33650 | 2026-03-15 08:11:56 | MASTER-OAFA | (14h 11m 57.93s , -23d 05m 18.8s) | C | 60 | 19.9 | 33710 | 2026-03-15 08:11:56 | MASTER-OAFA | (14h 11m 57.94s , -23d 05m 18.8s) | C | 180 | 20.4 | Coadd 33726 | 2026-03-15 08:13:11 | MASTER-OAFA | (14h 11m 51.16s , -23d 06m 17.7s) | C | 60 | 19.8 | 33806 | 2026-03-15 08:14:32 | MASTER-OAFA | (14h 03m 15.81s , -23d 05m 54.0s) | C | 60 | 20.0 | 33866 | 2026-03-15 08:14:32 | MASTER-OAFA | (14h 03m 15.81s , -23d 05m 54.1s) | C | 180 | 20.4 | Coadd 33886 | 2026-03-15 08:15:52 | MASTER-OAFA | (14h 03m 12.24s , -23d 04m 20.5s) | C | 60 | 20.1 | 33966 | 2026-03-15 08:17:12 | MASTER-OAFA | (14h 03m 12.30s , -23d 05m 42.2s) | C | 60 | 20.1 | 35185 | 2026-03-15 08:36:30 | MASTER- | (14h 07m 08.18s , -23d 27m 00.1s) | C | 180 | 19.3 | 35185 | 2026-03-15 08:36:30 | MASTER- | (14h 08m 27.19s , -24d 01m 06.3s) | C | 180 | 19.5 | 35377 | 2026-03-15 08:39:42 | MASTER- | (14h 07m 13.49s , -23d 28m 05.1s) | C | 180 | 19.6 | 35377 | 2026-03-15 08:39:42 | MASTER- | (14h 08m 32.57s , -24d 02m 10.3s) | C | 180 | 19.6 | 35568 | 2026-03-15 08:42:54 | MASTER- | (14h 07m 08.52s , -23d 29m 07.4s) | C | 180 | 19.5 | 35568 | 2026-03-15 08:42:54 | MASTER- | (14h 08m 27.64s , -24d 03m 12.2s) | C | 180 | 19.8 | 35534 | 2026-03-15 08:43:20 | MASTER-OAFA | (14h 11m 56.24s , -23d 04m 00.8s) | C | 60 | 19.9 | 35610 | 2026-03-15 08:44:36 | MASTER-OAFA | (14h 11m 56.27s , -23d 05m 30.6s) | C | 60 | 19.9 | 35760 | 2026-03-15 08:46:05 | MASTER- | (14h 07m 13.91s , -23d 28m 54.9s) | C | 180 | 19.3 | 35760 | 2026-03-15 08:46:05 | MASTER- | (14h 08m 33.15s , -24d 02m 59.4s) | C | 180 | 19.8 | 35891 | 2026-03-15 08:49:17 | MASTER-OAFA | (14h 03m 17.80s , -23d 04m 26.7s) | C | 60 | 20.0 | 35951 | 2026-03-15 08:49:17 | MASTER- | (14h 07m 10.42s , -23d 27m 22.5s) | C | 180 | 19.4 | 35951 | 2026-03-15 08:49:17 | MASTER- | (14h 08m 29.74s , -24d 01m 26.6s) | C | 180 | 19.9 | 36142 | 2026-03-15 08:52:28 | MASTER- | (14h 07m 10.07s , -23d 29m 05.4s) | C | 180 | 19.6 | 36142 | 2026-03-15 08:52:28 | MASTER- | (14h 08m 29.52s , -24d 03m 08.8s) | C | 180 | 19.8 | 36335 | 2026-03-15 08:55:40 | MASTER- | (14h 07m 12.33s , -23d 27m 15.8s) | C | 180 | 19.7 | 36335 | 2026-03-15 08:55:40 | MASTER- | (14h 08m 31.87s , -24d 01m 18.8s) | C | 180 | 19.9 | 36526 | 2026-03-15 08:58:52 | MASTER- | (14h 07m 05.49s , -23d 28m 09.4s) | C | 180 | 19.8 | 36526 | 2026-03-15 08:58:52 | MASTER- | (14h 08m 25.17s , -24d 02m 11.9s) | C | 180 | 19.8 | 36723 | 2026-03-15 09:02:09 | MASTER- | (14h 07m 05.49s , -23d 27m 09.1s) | C | 180 | 19.8 | 36723 | 2026-03-15 09:02:09 | MASTER- | (14h 08m 25.25s , -24d 01m 11.3s) | C | 180 | 19.8 | 36914 | 2026-03-15 09:05:20 | MASTER- | (14h 07m 12.73s , -23d 28m 09.7s) | C | 180 | 19.7 | 36914 | 2026-03-15 09:05:20 | MASTER- | (14h 08m 32.56s , -24d 02m 11.3s) | C | 180 | 19.8 | 37105 | 2026-03-15 09:08:31 | MASTER- | (14h 07m 05.16s , -23d 29m 09.4s) | C | 180 | 19.7 | 37105 | 2026-03-15 09:08:31 | MASTER- | (14h 08m 25.09s , -24d 03m 10.6s) | C | 180 | 19.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44014. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42134] EP260314a: SVOM/VT optical candidate
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44013 SUBJECT: EP260314a: SVOM/VT optical candidate DATE: 26/03/15 03:58:26 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, L. P. Xin, Y. N. Ma, C. Wu, Z. H. Yao, Y. L. Qiu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed ToO observation of the field of EP260314a detected by Einstein Probe (Zhao et al., GCN 44010). The observation started at 2026-03-14T23:03:04 UTC, i.e., about 11.5 minutes post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. An uncatalogued optical source was detected in VT_R stacked image within the error box of FXT (Zhao et al., GCN 44010). The position is at R.A., Dec. = 211.842259, -23.457728 degrees, equivalent to: R.A. (J2000) = +14:07:22.14 Dec. (J2000) = -23:27:27.82 with an uncertainty of 0.5 arcsec. The measurements in AB magnitudes are given below: Mid_time Band Exposure Time Magnitude (AB) 1.07 hour VT_R 29*50 sec 22.70+/-0.26 mag 1.07 hour VT_B 29*50 sec > 23.0 mag With the available data, we could not confirm the fading of the candidate. Our photometry was not corrected for Galactic extinction. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/44013. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42133] Fermi trigger No 795185313: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44012 SUBJECT: Fermi trigger No 795185313: Global MASTER-Net observations report DATE: 26/03/15 03:30:44 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 [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB260314.53 (trigger No 795185313,14h 23m 00.00s , -11d 19m 58.8s, R=50) errorbox 48826 sec after notice time and 48862 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 45 deg. The sun altitude is -42.8 deg. The galactic latitude b = 45 deg., longitude l = 337 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3186061 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 48883 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 40 | 19.7 | 48943 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 160 | 20.4 | Coadd 48934 | 2026-03-15 02:23:36 | MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) | C | 50 | 19.8 | 48999 | 2026-03-15 02:24:32 | MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) | C | 70 | 19.9 | 49081 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 80 | 19.9 | 49191 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 300 | 20.0 | Coadd 49177 | 2026-03-15 02:27:15 | MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) | C | 100 | 20.0 | 49293 | 2026-03-15 02:29:01 | MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) | C | 120 | 20.1 | 49429 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 140 | 20.2 | 49544 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 370 | 20.0 | Coadd 49590 | 2026-03-15 02:33:33 | MASTER-OAFA | (11h 42m 54.38s , -01d 47m 40.7s) | C | 170 | 20.3 | 49711 | 2026-03-15 02:36:29 | MASTER-OAFA | (11h 42m 54.21s , -01d 47m 40.3s) | C | 60 | 19.8 | 49777 | 2026-03-15 02:37:35 | MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.2s) | C | 60 | 19.9 | 49837 | 2026-03-15 02:37:35 | MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.1s) | C | 180 | 20.4 | Coadd 49843 | 2026-03-15 02:38:40 | MASTER-OAFA | (11h 42m 54.00s , -01d 47m 39.9s) | C | 60 | 19.9 | 49909 | 2026-03-15 02:39:47 | MASTER-OAFA | (11h 42m 53.89s , -01d 47m 39.7s) | C | 60 | 19.9 | 49974 | 2026-03-15 02:40:52 | MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) | C | 60 | 19.9 | 50034 | 2026-03-15 02:40:52 | MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) | C | 180 | 20.4 | Coadd 50040 | 2026-03-15 02:41:57 | MASTER-OAFA | (11h 42m 53.70s , -01d 47m 39.5s) | C | 60 | 19.8 | 50106 | 2026-03-15 02:43:04 | MASTER-OAFA | (11h 42m 53.59s , -01d 47m 39.7s) | C | 60 | 19.9 | 50172 | 2026-03-15 02:44:10 | MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) | C | 60 | 19.9 | 50232 | 2026-03-15 02:44:10 | MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) | C | 180 | 20.4 | Coadd 50237 | 2026-03-15 02:45:15 | MASTER-OAFA | (11h 42m 53.37s , -01d 47m 40.1s) | C | 60 | 19.9 | 50304 | 2026-03-15 02:46:21 | MASTER-OAFA | (11h 42m 53.26s , -01d 47m 40.2s) | C | 60 | 19.8 | 50369 | 2026-03-15 02:47:27 | MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) | C | 60 | 19.9 | 50429 | 2026-03-15 02:47:27 | MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) | C | 180 | 20.0 | Coadd 50434 | 2026-03-15 02:48:32 | MASTER-OAFA | (11h 42m 53.02s , -01d 47m 40.5s) | C | 60 | 19.9 | 50500 | 2026-03-15 02:49:38 | MASTER-OAFA | (11h 42m 52.89s , -01d 47m 40.4s) | C | 60 | 19.9 | 50566 | 2026-03-15 02:50:44 | MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) | C | 60 | 19.9 | 50626 | 2026-03-15 02:50:44 | MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) | C | 180 | 20.4 | Coadd 50632 | 2026-03-15 02:51:49 | MASTER-OAFA | (11h 42m 52.64s , -01d 47m 40.6s) | C | 60 | 19.9 | 50698 | 2026-03-15 02:52:56 | MASTER-OAFA | (11h 42m 52.47s , -01d 47m 40.8s) | C | 60 | 19.9 | 50764 | 2026-03-15 02:54:02 | MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) | C | 60 | 19.9 | 50824 | 2026-03-15 02:54:02 | MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) | C | 180 | 20.0 | Coadd 50829 | 2026-03-15 02:55:07 | MASTER-OAFA | (11h 42m 52.22s , -01d 47m 41.7s) | C | 60 | 19.9 | 50896 | 2026-03-15 02:56:13 | MASTER-OAFA | (11h 42m 52.09s , -01d 47m 42.1s) | C | 60 | 19.9 | 50961 | 2026-03-15 02:57:19 | MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) | C | 60 | 19.9 | 51021 | 2026-03-15 02:57:19 | MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) | C | 180 | 20.0 | Coadd 51027 | 2026-03-15 02:58:24 | MASTER-OAFA | (11h 42m 51.79s , -01d 47m 43.3s) | C | 60 | 19.9 | 51093 | 2026-03-15 02:59:31 | MASTER-OAFA | (11h 42m 51.62s , -01d 47m 43.7s) | C | 60 | 19.9 | 51159 | 2026-03-15 03:00:36 | MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.1s) | C | 60 | 19.9 | 51219 | 2026-03-15 03:00:36 | MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.0s) | C | 180 | 20.0 | Coadd 51224 | 2026-03-15 03:01:42 | MASTER-OAFA | (11h 42m 51.36s , -01d 47m 44.9s) | C | 60 | 19.9 | 51291 | 2026-03-15 03:02:48 | MASTER-OAFA | (11h 42m 51.20s , -01d 47m 45.9s) | C | 60 | 19.9 | 51356 | 2026-03-15 03:03:54 | MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) | C | 60 | 19.9 | 51416 | 2026-03-15 03:03:54 | MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) | C | 180 | 20.0 | Coadd 51421 | 2026-03-15 03:04:59 | MASTER-OAFA | (11h 42m 50.89s , -01d 47m 46.6s) | C | 60 | 20.0 | 51488 | 2026-03-15 03:06:06 | MASTER-OAFA | (11h 42m 50.76s , -01d 47m 47.3s) | C | 60 | 19.9 | 51553 | 2026-03-15 03:07:11 | MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) | C | 60 | 19.9 | 51613 | 2026-03-15 03:07:11 | MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) | C | 180 | 20.0 | Coadd 51619 | 2026-03-15 03:08:17 | MASTER-OAFA | (11h 42m 50.44s , -01d 47m 49.1s) | C | 60 | 19.9 | 51686 | 2026-03-15 03:09:24 | MASTER-OAFA | (11h 42m 50.31s , -01d 47m 49.8s) | C | 60 | 19.9 | 51751 | 2026-03-15 03:10:29 | MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) | C | 60 | 19.9 | 51811 | 2026-03-15 03:10:29 | MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) | C | 180 | 20.0 | Coadd 51816 | 2026-03-15 03:11:34 | MASTER-OAFA | (11h 42m 50.01s , -01d 47m 51.7s) | C | 60 | 19.9 | 51883 | 2026-03-15 03:12:40 | MASTER-OAFA | (11h 42m 49.85s , -01d 47m 53.2s) | C | 60 | 19.9 | 51948 | 2026-03-15 03:13:46 | MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) | C | 60 | 19.9 | 52008 | 2026-03-15 03:13:46 | MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) | C | 180 | 20.0 | Coadd 52014 | 2026-03-15 03:14:51 | MASTER-OAFA | (11h 42m 49.52s , -01d 47m 54.8s) | C | 60 | 19.9 | 52080 | 2026-03-15 03:15:58 | MASTER-OAFA | (11h 42m 49.36s , -01d 47m 55.6s) | C | 60 | 19.9 | 52146 | 2026-03-15 03:17:03 | MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) | C | 60 | 19.9 | 52206 | 2026-03-15 03:17:03 | MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) | C | 180 | 20.0 | Coadd 52211 | 2026-03-15 03:18:09 | MASTER-OAFA | (11h 42m 49.02s , -01d 47m 57.7s) | C | 60 | 19.9 | 52277 | 2026-03-15 03:19:14 | MASTER-OAFA | (11h 42m 48.86s , -01d 47m 58.8s) | C | 60 | 19.9 | 52342 | 2026-03-15 03:20:20 | MASTER-OAFA | (11h 42m 48.71s , -01d 48m 00.4s) | C | 60 | 19.9 | 52408 | 2026-03-15 03:21:26 | MASTER-OAFA | (11h 42m 48.52s , -01d 48m 01.7s) | C | 60 | 19.9 | 52474 | 2026-03-15 03:22:32 | MASTER-OAFA | (11h 42m 48.36s , -01d 48m 02.8s) | C | 60 | 19.9 | 52540 | 2026-03-15 03:23:37 | MASTER-OAFA | (11h 42m 48.20s , -01d 48m 04.0s) | C | 60 | 19.9 | 52605 | 2026-03-15 03:24:43 | MASTER-OAFA | (11h 42m 48.01s , -01d 48m 05.0s) | C | 60 | 19.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44012. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42132] IceCube Alert 260315A: Global MASTER-Net observations report
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44011 SUBJECT: IceCube Alert 260315A: Global MASTER-Net observations report DATE: 26/03/15 02:40:16 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 [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 260315A (trigger No 46886533,11h 42m 40.32s , -01d 53m 06.0s, R=0.71) errorbox 105 sec after notice time and 224 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 45 deg. The sun altitude is -42.8 deg. The galactic latitude b = 57 deg., longitude l = 272 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3187113 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 244 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 40 | 19.7 | 304 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 160 | 20.4 | Coadd 295 | 2026-03-15 02:23:36 | MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) | C | 50 | 19.8 | 361 | 2026-03-15 02:24:32 | MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) | C | 70 | 19.9 | 442 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 80 | 19.9 | 552 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 300 | 20.0 | Coadd 539 | 2026-03-15 02:27:15 | MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) | C | 100 | 20.0 | 655 | 2026-03-15 02:29:01 | MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) | C | 120 | 20.1 | 790 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 140 | 20.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44011. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42131] EP260314a: Einstein Probe detection of an X-ray transient
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44010 SUBJECT: EP260314a: Einstein Probe detection of an X-ray transient DATE: 26/03/15 02:16:51 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Yaqi Zhao (USTC, PRIC), Yue Wu (NJU), Rui-Zhi Li (YNAO, CAS) and Hai-Wu Pan (NAOC) on behalf of the Einstein Probe (EP) team: We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP260314a. The transient triggered EP-WXT (ID: 01709258851) at 2026-03-14T22:51:36 (UTC). The WXT position of the source is R.A. = 211.845 deg, DEC = -23.445 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic). A follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 211.8437 deg, DEC = -23.4601 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic). Further information will be updated when the telemetry data is received. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/44010. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42130] The EP-WXT trigger 01709258851: Las Cumbres upper limit
by GCN Circulars 15 Mar '26

15 Mar '26

TITLE: GCN CIRCULAR NUMBER: 44009 SUBJECT: The EP-WXT trigger 01709258851: Las Cumbres upper limit DATE: 26/03/15 01:07:35 GMT FROM: Wenxiong Li at NAOC <liwenxiong1992(a)gmail.com> Wenxiong Li, Runduo Liang (NAOC), Iair Arcavi, Ido Keinan (TAU), David Sand (U of Arizona) We observed the position of the EP-WXT trigger 01709258851 with a Las Cumbres 1m telescope at Sutherland Observatory, South Africa, 50 mins after the Einstein Probe WXT trigger. We took 4x300s exposures in the broad optical w band. We didn’t detect any uncataloged source within the EP-WXT error circle down to a limiting r-band mag of 21.5 mag. View this GCN Circular online at https://gcn.nasa.gov/circulars/44009. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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