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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
32801 results found.
- GRB001109: Optical observations
- GRB001109: BeppoSAX/NFI Observations
- GRB001109, R-band optical observations
- GRB001109, Radio observations
- BeppoSAX ALERT: GRB001109
- GRB001105 BVRI field photometry correction
- GRB001105, BVRI field photometry
- GRB 001105, R-band observation
- IPN TRIANGULATION OF GRB001105
- GRB 001025B, Optical obervations
- GRB 991208: HST Imaging of the Host Galaxy
- GRB000926: R-image of the host galaxy
- GRB 001025B, I-band observations
- GRB 001025 Optical Observations
- GRB 001025A, optical observation
- IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
- IPN triangulation of GRB001025
- ASM Localization of GRB 001025
- GRB001007, Radio observations
- IPN TRIANGULATION OF GRB001020
- GRB001019, Optical Observations
- GRB 001018, Possible Radio Afterglow
- GRB001018, Gamma Ray Observations
- IPN TRIANGULATION OF GRB001019
- IPN TRIANGULATION OF GRB001018
- IPN TRIANGULATION OF GRB 001017
- GRB 000926: Improved Absorber Redshift
- V,R,I band observations of GRB000926
- The Likely Optical/Infrared Afterglow of GRB 001011
- HETE positions added to GCN
- BeppoSAX ALERT: GRB001011
- GRB 001007, BVR-band observations
- GRB000926 - Amateur Optical Observations
- CONCAM null result on GRB001005
- IPN triangulation of GRB001007
- GRB 000926 : the host galaxy
- IPN triangulation of GRB001005
- GRB 000926 Chandra Observation
- IPN triangulation of GRB 001004
- Public availability of BeppoSAX data of GRB000926
- GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
- GRB 000926, Optical Decay
- GRB000926 - Optical observations
- GRB000926 - Optical observations
- GRB 000926: optical observations
- GRB 000926, Optical 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
- 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.
- 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
- GRB 000926: Optical candidate
- Optical candidate for GRB000926
- IPN triangulation of GRB000926
- GRB 000911, BVRI field photometry
- GRB000911: Sub-millimeter observations
- IPN triangulation of GRB000925
- 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
- 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
- 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
- GRB 991208 Host Galaxy Imaging
- Updated IPN coordinates for 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