Bright, long-duration GRB 260727A detected by SVOM with multi-peaked structure and significant follow-up observations.

AI Summary

GRB 260727A was a bright, long-duration gamma-ray burst detected by SVOM with a multi-peaked structure lasting 53 seconds. Follow-up observations in multiple bands revealed an uncatalogued X-ray source and set upper limits on optical and near-infrared counterparts.

Measurements

Notices (1)

SVOM — GRB · Mon, 27 Jul 2026 00:19:31 GMT

GCN Circulars (13)

GCN-45251 — GRB 260727A · Wed, 29 Jul 2026 11:19:50 GMT
Optical observations of the gamma-ray burst GRB 260727A were conducted using telescopes at Abastumani Observatory (AbAO) and the Special Astrophysical Observatory of the RAS (SAO RAS) starting approximately 0.81 days after the initial trigger. No optical candidates were detected within the error circle, with limiting magnitudes of 20.9 and 22.9 in the R and Rc bands, respectively.

GCN-45247 — GRB 260727A · Wed, 29 Jul 2026 01:59:56 GMT
The SVOM/GRM instrument detected a gamma-ray burst, GRB 260727A, which was also observed by multiple other satellites. The burst, lasting 53 seconds, exhibited multiple peaks and a power-law spectrum with an exponential cutoff.

GCN-45242 — GRB 260727A · Tue, 28 Jul 2026 12:56:48 GMT
The Konus-Wind satellite detected a long-duration gamma-ray burst (GRB 260727A) on July 27, 2026, at 00:22:07.631 UT. The burst had a multi-peaked structure lasting approximately 30 seconds and was observed up to 300 keV, with significant fluence and peak flux measurements provided.

GCN-45240 — GRB 260727A · Tue, 28 Jul 2026 11:03:43 GMT
The Liverpool Telescope observed the field of GRB 260727A approximately 24.75 hours after the trigger but did not detect any new sources in the error region, with upper limits of r > 22.17 and i > 22.05 mag. The observation was partially affected by bright stars near the edge of the error region.

GCN-45236 — GRB 260727A · Tue, 28 Jul 2026 02:53:14 GMT
The SVOM mission team reported follow-up observations of GRB 260727A, an uncatalogued X-ray source detected within the ECLAIRs error circle, with a total exposure time of around 6.1 ks. The source's spectrum and flux were analyzed, and optical follow-up observations were conducted by multiple telescopes.

GCN-45233 — GRB 260727A · Mon, 27 Jul 2026 22:08:29 GMT
The Glowbug gamma-ray telescope on the International Space Station detected GRB 260727A, a gamma-ray burst also observed by SVOM and AstroSat. The burst had a duration of 22.5 seconds and a significance of 24.2 sigma, with Glowbug capturing the brightest portion of the emission.

GCN-45231 — GRB 260727A · Mon, 27 Jul 2026 19:17:50 GMT
A team of astronomers used the Palomar 1-m telescope with the WINTER camera to observe the field of GRB 260727A in the J-band, but did not detect any new source within the SVOM localization, establishing a 5-sigma upper limit of J = 19.19 mag (AB). This non-detection provides constraints on the near-infrared emission of the gamma-ray burst.

GCN-45228 — GRB 260727A · Mon, 27 Jul 2026 15:20:56 GMT
The RAPAS network observed the field of GRB 260727A in response to an SVOM broker alert but detected no optical afterglow at the specified position. Observations were conducted using a 0.25 m robotic telescope with filters matched to Gaia bands, and no significant optical transient was found within the error circle.

GCN-45226 — GRB 260727A · Mon, 27 Jul 2026 11:30:59 GMT
The Gravitational-wave Optical Transient Observer (GOTO) conducted optical observations following the detection of GRB 260727A by SVOM/ECLAIRs and AstroSat, but found no new transients associated with the event down to a 5-sigma depth of L<20.2 AB mag.

GCN-45225 — GRB 260727A · Mon, 27 Jul 2026 09:56:45 GMT
AstroSat's CZTI instrument detected a long gamma-ray burst, GRB 260727A, which was also observed by SVOM/ECLAIRs. The burst showed multiple emission peaks and was detected in both the 20-200 keV and 100-500 keV energy ranges, with a T90 duration of approximately 20 seconds.

GCN-45224 — GRB 260727A · Mon, 27 Jul 2026 08:53:05 GMT
The GRANDMA/Kilonova-Catcher collaboration observed the field of GRB 260627A using a TEC 180 telescope but did not detect any optical counterpart, setting an upper limit of 19.8 magnitude in the r-band. The observations were part of a citizen science project aimed at detecting kilonovae, which are associated with gravitational wave events and gamma-ray bursts.

GCN-45223 — GRB 260727A · Mon, 27 Jul 2026 07:34:00 GMT
The SVOM mission team observed the field of GRB 260727A using the LCO 1m telescope at Tenerife Observatory, starting about 2.16 hours after the trigger. No new source was detected within the error box, with an upper limit magnitude of z > 20.2 AB (5-sigma) at 2.25 hours after the trigger.

GCN-45220 — GRB 260727A · Mon, 27 Jul 2026 00:58:53 GMT
The SVOM mission detected a bright, long-duration gamma-ray burst, GRB 260727A, on July 27, 2026, at 00:22:02 UTC. The burst was localized to RA 22h06m34.69s, Dec 74d32m25.98s with a 90% confidence radius of 2.12 arcmin.