Weak GRB 260619A detected with fading optical afterglow.

AI Summary

The SVOM/ECLAIRs instrument detected a weak gamma-ray burst, GRB 260619A, with a faint single peak light curve and a blackbody spectrum. Follow-up observations indicate fading in the optical VT_B band while the VT_R band remains stable, suggesting evolving optical properties.

Measurements

Notices (1)

SVOM — GRB · Fri, 19 Jun 2026 02:11:59 GMT

GCN Circulars (8)

GCN-45152 — GRB 260619A · Tue, 14 Jul 2026 03:36:48 GMT
The SVOM/VT telescope has been continuously observing the gamma-ray burst GRB 260619A, detecting significant fading in the VT_B channel while the VT_R channel remains stable, indicating potential changes in the optical properties of the burst.

GCN-45041 — GRB 260619A · Wed, 24 Jun 2026 20:31:19 GMT
The SVOM/ECLAIRs instrument detected a gamma-ray burst, GRB 260619A, with a faint single peak lightcurve lasting about 40 seconds. The event's spectrum is best fit by a blackbody model with a temperature of approximately 6.6 keV, and it had a fluence of 2.03e-07 erg/cm² in the 4-120 keV energy range.

GCN-45015 — GRB 260619A · Sat, 20 Jun 2026 13:36:17 GMT
The optical afterglow of the gamma-ray burst GRB 260619A was observed using the Nordic Optical Telescope, with a measured AB magnitude of i = 22.26. The brightness of the afterglow showed little evolution compared to previous observations, prompting a call for further follow-up studies.

GCN-45008 — GRB 260619A · Fri, 19 Jun 2026 16:30:48 GMT
The Thai Robotic Telescope network (TRT) has confirmed the optical counterpart of GRB 260619A, initially detected by SVOM/ECLAIRs, with a brightness of r~21.4 at 3.95 hours post-trigger. This detection was calibrated using Pan-STARRS DR2 stars and is significant for studying the afterglow of this gamma-ray burst.

GCN-45003 — GRB 260619A · Fri, 19 Jun 2026 14:30:00 GMT
The SVOM/VT telescope confirmed the optical counterpart of the gamma-ray burst GRB 260619A, detected in both VT_B and VT_R channels approximately 3.71 hours post-trigger, with magnitudes of 22.56 +/- 0.15 and 22.63 +/- 0.18 respectively. This detection is significant as it provides crucial data for studying the afterglow of gamma-ray bursts.

GCN-44999 — GRB 260619A · Fri, 19 Jun 2026 13:01:35 GMT
An uncatalogued source consistent with the error circle of the gamma-ray burst GRB 260619A was detected by the SVOM/COLIBRÍ (FM-GFT) telescope, but the lack of variability prevents firm confirmation as the optical afterglow. The source has preliminary magnitudes of r = 22.13 and z = 21.91.

GCN-44992 — GRB 260619A · Fri, 19 Jun 2026 09:54:36 GMT
The GRANDMA/Kilonova-Catcher collaboration observed the field of GRB 260619A using the CDK17 telescope at the AITP San Pedro Chile Observatory, starting 4.0 hours after the gamma-ray burst (GRB) was detected by SVOM/ECLAIRs. No optical uncatalogued source was detected within the error box, with an upper limit magnitude of 20.3 (5 sigma) in the r (AB) filter.

GCN-44985 — GRB 260619A · Fri, 19 Jun 2026 03:10:53 GMT
The SVOM mission detected a faint gamma-ray burst, GRB 260619A, on June 19, 2026, at 02:12:40 UTC. The burst was only detected by the Image Trigger (IMT) with a signal-to-noise ratio of 6.90 in the 8-50 keV energy band over 40.96 seconds, but its significance was below the threshold for immediate follow-up.