GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
- IPN triangulation of GRB001005
- HETE-2 48 hour Launch Delay
- GRB 000926 Chandra Observation
- IPN triangulation of GRB 001004
- Public availability of BeppoSAX data of GRB000926
- GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
- GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
- GRB000926 - Optical observations
- GRB000926 - Optical observations
- GRB 000926, Optical Decay
- GRB000911: VLT infrared observation
- GRB000926 - Optical observations
- GRB000926 - Optical observations
- GRB 000926: optical observations
- GRB 000926, Optical Observations
- GRB000926 - Optical observations
- GRB000911: optical VLT observations
- GRB000926 K'-band Observation
- GRB000926 : increasing optical decay slope
- GRB000926 optical observations
- GRB000926 - Optical observations
- Re: GRB 000926, optical observation by Oksanen (vsnet-grb)
- J and K band observations of GRB 000926
- GRB000911 Optical Observations
- GRB 000926: Lightcurve Update and Predictions
- GRB 000926, optical observation by Oksanen (vsnet-grb)
- GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
- GRB000926: Optical observations
- CONCAM crude optical limits before and after GRB000926
- GRB 000926: Preliminary R-band Lightcurve
- GRB 000926 HST/Chandra TOO Status
- Spectroscopic Redshift of GRB 000926
- GRB 000926, Optical Observation
- GRB000926, radio observations
- GRB 000926: Optical candidate
- Optical candidate for GRB000926
- IPN triangulation of GRB000926
- IPN triangulation of GRB000926
- GRB 000911, BVRI field photometry
- GRB000911: Corrected coordinates
- GRB000911: Sub-millimeter observations
- IPN triangulation of GRB000925
- GRB000911: Optical Transient
- GRB000911, Radio and Optical observations
- GRB000911, Radio observations
- GRB000911: Optical observations
- IPN triangulation of GRB000911
- IPN triangulation of GRB000910
- False GRB alarm from RXTE/ASM on 8 Sept 2000
- GRB 000830: Optical observations
- GRB000830: Optical observations
- GRB000830, TNG B-band observations
- GRB000830, BVRI field photometry
- GRB000830: Optical observations
- GRB000210, Optical observations
- Chandra Position of GRB000210
- "Snapshot" afterglow IDs and GRB 000830
- GRB000830: Optical observations
- IPN triangulation of GRB000830
- HST/STIS observations of the host galaxy of GRB 980329
- HST/STIS observations of the chaotic environment of GRB 980613
- IPN localization of GRB000820
- SGR 1806-20 burst activity
- GRB000812, TNG R-band observations
- GRB000801 & GRB000730, Gamma Ray Observations
- GRB000730, Gamma Ray Observations
- GRB000812, Radio observations
- IPN localization of GRB000812
- IPN localization of GRB000811
- GRB000801, Gamma Ray Observations
- GRB000801, VLT-Antu R-band observations
- GRB000301C, UBVI optical observations
- GRB000801, Radio Observations
- GRB 991208 Host Galaxy Imaging
- Updated IPN coordinates for GRB000801
- IPN localization of GRB000801
- IPN localization of GRB000801
- IPN localization of GRB000730B
- IPN localization of GRB000730B
- IPN localization of GRB000730
- GRB 990510: Possible detection of a host galaxy
- GRB 990510 Host Galaxy Discovery
- GRB 000727, optical observations
- IPN localization of GRB000727
- GRB 990705, HST/STIS observations of the host galaxy
- GRB 990712: Late time HST/STIS Observations
- GRB 991216, HST/STIS observations
- GRB000620, Radio Observations
- GRB981226, HST/STIS observations of the host galaxy
- GRB000630, optical observations
- GRB 000630: Detection of the Optical Afterglow
- GRB000630, Revised BVRI Field Photometry
- GRB000630, Optical Observations
- GRB000630, optical observations
- GRB000630, optical observations
- GRB000630, BVRI Field Photometry
- GRB000630, optical observations
- GRB000630, optical observations
- GRB000630: Optical observations
- GRB000630, Radio Observations