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[vsnet-grb-info 42043] GRB 260303A: 1.3m DFOT optical upper limit
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43925 SUBJECT: GRB 260303A: 1.3m DFOT optical upper limit DATE: 26/03/05 16:34:28 GMT FROM: Debalina Kar at ARIES <kardebalina2000(a)gmail.com> Debalina Kar, Pankaj Pawar, Anshika Gupta, Dhruv Jain and Kuntal Misra (ARIES) report: We observed the field of GRB 260303A triggered by SVOM/ECLAIRs (sb26030303, Wang et al., GCN 43901) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations began on 2026-03-03 at 14:54:29.000 UT, approximately 8.88 hours after the trigger. We obtained multiple exposures of 300 s each in the R filter . A total of 10 frames were aligned and stacked to improve the signal-to-noise ratio. In the stacked frame we do not detect any optical counterpart within the error box of SVOM/ECLAIRs (Brunet et al., GCN 43922, Wang et al., GCN 43901) as well as outside the ECLAIRs error circle as reported by Xin et al. (GCN 43916) and (Schneider et al., GCN 43902). This is consistent with the non-detection in the J band reported by Mo et al. (GCN 43915). We derive the following 3-sigma upper limit from the stacked image: Date (UT) Start Time T_start–T0 (hr) Filter Exposure Magnitude ---------------------------------------------------------------------------------- 2026-03-03 14:54:29 ~8.88 R 300 s × 10 > 20.29 The reported magnitude is not corrected for Galactic extinction. Photometric calibration was performed using standard stars from the USNO-B1.0 catalogue. View this GCN Circular online at https://gcn.nasa.gov/circulars/43925. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42042] EP260214b: ATCA 6 GHz observations
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43924 SUBJECT: EP260214b: ATCA 6 GHz observations DATE: 26/03/05 15:31:04 GMT FROM: Giulia Gianfagna at INAF-IAPS <giulia.gianfagna(a)inaf.it> G. Gianfagna, G. Bruni, A. L. Thakur, L. Piro (INAF-IAPS) report: We observed the Fast X-ray Transient EP260214b (J Yang et al., GCN 43744, H Yang et al., GCN 43779) with the Australian Telescope Compact Array radio telescope using the 4-cm receiver. Observations were performed on March 3 2026 (at a mean epoch of ~17 days after the EP trigger) for a total of 6 hours. Data were reduced and imaged with standard CASA procedures. The final 6 GHz image has an RMS of ~15 uJy/beam. No radio emission is apparent at the position of the optical counterpart (He et al. GCN 43745, Watson et al. GCN 43747, Le Floch et al. GCN 43749, Pérez-Fournon et al. GCN 43750, Russeil et al. 43752,Li et al. GCN 43755, Vijayjumar et al. GCN 43757, Becerra et al. GCN 43758, Yang et al. GCN 43760, Aaryan et al. GCN 43762, Bochenek et al. GCN 43764, Kar et al. GCN 43774, Volnova et al. GCN 43775). The corresponding 3-sigma upper limit is thus ~50 uJy. Further ATCA observations are planned. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (grid.421683.a), which is funded by the Australian Government for operation as a National Facility managed by CSIRO. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. View this GCN Circular online at https://gcn.nasa.gov/circulars/43924. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42041] GRB 260211A: SVOM/VT optical rebrightening at 20 days after the burst, SN candidate
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43923 SUBJECT: GRB 260211A: SVOM/VT optical rebrightening at 20 days after the burst, SN candidate DATE: 26/03/05 15:06:48 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, Y. N. Ma, C. Wu, Z. H. Yao, Y. L. Qiu, L. P. Xin, 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. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team. SVOM/VT performed further ToO observations of GRB 260211A detected by SVOM/Eclairs and SVOM/GRM (sb26021102, Gotz et al., GCN 43705). Also there was a sub-threshold detection by Fermi GBM (Hamburg et al., GCN 43713). The observations were performed on 2026-03-03 and 2026-03-05 in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. The optical counterpart (Li et al., GCN 43720, GCN 43748) was measured to have a brightness of VT_R=22.91+/-0.25 mag at 19.36 days post trigger and VT_R=22.85+/-0.25 mag at 21.31 days respectively. These measurements show that the counterpart is rebrightening, relative to the reported brightness (Li et al. GCN 43748). We suggest that it is likely the supernova associated with the burst. Further follow-up observations are encouraged. Our photometry was in AB magnitude and 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/43923. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42040] GRB 260303A: SVOM/ECLAIRs refined analysis
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43922 SUBJECT: GRB 260303A: SVOM/ECLAIRs refined analysis DATE: 26/03/05 09:11:45 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, L. Bouchet (IRAP), Z. Wang, D. Kong(GXU) report on behalf of the SVOM/ECLAIRs team. Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of GRB 260303A (SVOM burst-id sb26030303 – GCN 43901, trigger time T0 = 2026-03-03T06:01:47 UTC). The burst that triggered ECLAIRs shows a single peak lightcurve. The burst duration is estimated to be around 14.5s (from T0-19.5s to T0-5s) in the 4-120 keV energy band through imaging. The refined burst localization is RA, Dec = 93.1458, 41.1727 degrees: RA (J2000) = 06h12m34.99s Dec (J2000) = 41d10m21.72s with a 90% C.L. radius of 9.6 arcmin (including systematic error of 6 arcmin added in quadrature). The time-averaged spectrum from T0-19.5 s to T0-5 s in the energy range 5-120 keV is best fitted by a powerlaw model with a photon index of 1.67 +0.14/-0.13. With this model, the 4-120 keV fluence is (1.19 +0.11/-0.20) e-6 erg/cm² and the 4-120 keV photon flux is 2.73 +0.16/-0.31 ph/cm²/s. All the quoted errors are at the 68% confidence level. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: Marius Brunet (IRAP) (marius.brunet at utoulouse.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/43922. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42039] Fermi GRB 260305A: Global MASTER-Net observations report
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43921 SUBJECT: Fermi GRB 260305A: Global MASTER-Net observations report DATE: 26/03/05 03:00:46 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-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 260305A ( Fermi GBM team, GCN 43920) errorbox 55 sec after notice time and 87 sec after trigger time at 2026-03-05 02:43:05 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 70 deg. The sun altitude is -22.7 deg. The galactic latitude b = 68 deg., longitude l = 57 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3169780 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 98 | 2026-03-05 02:43:05 | MASTER-SAAO | (14h 27m 04.56s , +37d 55m 52.3s) | C | 20 | 17.2 | 98 | 2026-03-05 02:43:05 | MASTER-SAAO | (14h 24m 55.60s , +38d 11m 54.7s) | C | 20 | 17.0 | 217 | 2026-03-05 02:44:55 | MASTER-SAAO | (14h 12m 08.18s , +34d 56m 29.5s) | C | 40 | 17.4 | 272 | 2026-03-05 02:44:55 | MASTER-SAAO | (14h 12m 08.18s , +34d 56m 29.4s) | C | 150 | 18.6 | 217 | 2026-03-05 02:44:55 | MASTER-SAAO | (14h 14m 11.70s , +34d 40m 22.7s) | C | 40 | 17.6 | 272 | 2026-03-05 02:44:55 | MASTER-SAAO | (14h 14m 11.71s , +34d 40m 22.8s) | C | 150 | 18.4 | 281 | 2026-03-05 02:45:54 | MASTER-SAAO | (14h 14m 11.94s , +34d 40m 26.1s) | C | 50 | 17.8 | 281 | 2026-03-05 02:45:54 | MASTER-SAAO | (14h 12m 08.41s , +34d 56m 34.1s) | C | 50 | 17.5 | 355 | 2026-03-05 02:47:03 | MASTER-SAAO | (14h 12m 08.69s , +34d 56m 39.2s) | C | 60 | 17.7 | 355 | 2026-03-05 02:47:03 | MASTER-SAAO | (14h 14m 12.16s , +34d 40m 30.0s) | C | 60 | 17.8 | 625 | 2026-03-05 02:51:33 | MASTER-SAAO | (14h 24m 26.43s , +33d 57m 36.0s) | C | 60 | 17.8 | 625 | 2026-03-05 02:51:33 | MASTER-SAAO | (14h 22m 22.92s , +34d 13m 45.5s) | C | 60 | 17.5 | 704 | 2026-03-05 02:52:52 | MASTER-SAAO | (14h 24m 26.68s , +33d 57m 40.9s) | C | 60 | 17.8 | 704 | 2026-03-05 02:52:52 | MASTER-SAAO | (14h 22m 23.24s , +34d 13m 52.3s) | C | 60 | 17.7 | 784 | 2026-03-05 02:54:11 | MASTER-SAAO | (14h 22m 23.58s , +34d 13m 57.5s) | C | 60 | 17.7 | 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/43921. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42038] GRB 260305A: Fermi GBM Final Real-time Localization
by GCN Circulars 05 Mar '26

05 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43920 SUBJECT: GRB 260305A: Fermi GBM Final Real-time Localization DATE: 26/03/05 02:52:09 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 02:41:38 UT on 5 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260305A (trigger 794371303.18619 / 260305112). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 216.5, Dec = 34.0 (J2000 degrees, equivalent to J2000 14h 26m, 34d 00'), with a statistical uncertainty of 2.4 degrees. The angle from the Fermi LAT boresight is 49.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260305112/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260305112/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260305112/… View this GCN Circular online at https://gcn.nasa.gov/circulars/43920. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42037] GCN Announcement: Retirement of GCN Classic VOEvent Brokers
by GCN Announcements 04 Mar '26

04 Mar '26

As initially announced in 2025, we are planning to retire the GCN Classic VOEvent brokers (https://gcn.gsfc.nasa.gov/voevent.html) on April 6, 2026. This impacts users who utilize the VOEvent Transfer Protocol (VTP) to receive VOEvent-format GCN Classic Notices. VOEvent-format Notices remain available via Kafka and email (https://gcn.nasa.gov/docs/notices/consuming) and we recommend users migrate from VTP to Kafka. For more details on this new feature and an archive of GCN news and announcements, see https://gcn.nasa.gov/news. For questions, issues, or bug reports, please contact us via: - Contact form: https://gcn.nasa.gov/contact - GitHub issue tracker: https://github.com/nasa-gcn/gcn.nasa.gov/issues --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42036] GRB 260303B: AstroSat CZTI detection
by GCN Circulars 04 Mar '26

04 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43919 SUBJECT: GRB 260303B: AstroSat CZTI detection DATE: 26/03/04 19:43:04 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (IUCAA), A. Arya (IITB), A. Goyal (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 260303B which was also detected by Fermi GBM (Fermi GBM Team., GCN Circ. 43907), and NuSTAR (Waratkar et. al. , GCN Circ. 43914). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2026-03-03 13:24:23.50 UTC. The measured peak count rate associated with the burst is 59 (+29, -5) counts/s above the background in the combined data of two quadrants (out of four), with a total of 504 (+69, -193) counts. The local mean background count rate was 167 (+1, -5) counts/s. We measure a T90 of 11 (+1, -3) s. The source was also faintly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/43919. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42035] GRB 260304A: AstroSat CZTI detection of a long burst
by GCN Circulars 04 Mar '26

04 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43918 SUBJECT: GRB 260304A: AstroSat CZTI detection of a long burst DATE: 26/03/04 18:56:56 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> A. Arya (IITB), A. Goyal (IITB), M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (IUCAA), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 260304A which was also detected by Konus-Wind (Priv. Comm. with T0 at 07:24:53.608 UT). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-03-04 07:25:02.120 UTC. The measured peak count rate associated with the burst is 121 (+29, -16) counts/s above the background in the combined data of two quadrants (out of four), with a total of 1569 (+602, -342) counts. The local mean background count rate was 142 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of 32 (+23, -9) s. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-03-04 07:24:50.186 UTC. The measured peak count rate associated with the burst is 298 (+72, -28) counts/s above the background in the combined data of all quadrants, with a total of 2770 (+533, -517) counts. The local mean background count rate was 1221 (+5, -4) counts/s. We measure a T90 of 31 (+3, -6) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/43918. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42034] SVOM/sb26030408: SVOM detection of an X-ray transient likely associated with Beta Persei
by GCN Circulars 04 Mar '26

04 Mar '26

TITLE: GCN CIRCULAR NUMBER: 43917 SUBJECT: SVOM/sb26030408: SVOM detection of an X-ray transient likely associated with Beta Persei DATE: 26/03/04 11:49:37 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> A. Li (BNU), C. Wu (NAOC), H. Yang, L. Bouchet (IRAP), D. Turpin, D. Götz (CEA) report on behalf of the SVOM mission team: At 2026-03-04T09:44:54 UTC (T0), SVOM/ECLAIRs triggered and located a possible X-ray transient (SVOM burst-id sb26030408). The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network. The transient was only detected by the Image Trigger (IMT), which produced a sequence of 6 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 12.50 in the [5-20] keV energy band over a time window of 655.36 seconds starting at 2026-03-04T09:42:10. The localization of the best alert is R.A., Dec. 47.1221, 40.9012 degrees: R.A. (J2000) = 3h08m29.30s Dec. (J2000) = 40d54m04.41s with a 90% confidence level (C.L.) radius of 6.48 arcmin (including systematic error of 2 arcmin added in quadrature). No immediate slew was performed on this transient. No X-ray observation could be performed by SVOM/MXT for the time being. No optical observation could be performed by SVOM/VT for the time being. We notice the presence of the bright star Beta Persei, located at 4.9 arcmin from the trigger position, which could be the origin of the trigger. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. SVOM/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE. The Burst Advocate (BA) on shift for this alert is An Li: 202221160007(a)mail.bnu.edu.cn. Please contact the BA by email if you require additional information. View this GCN Circular online at https://gcn.nasa.gov/circulars/43917. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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