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').
39 results found.
- GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
- GRB 131202A: theoretical estimation of the redshift
- GRB 120923A: Gemini afterglow detection, high-z candidate
- GRB 090423: Spitzer observations of the z~8.3 burst
- GRB 090423: WSRT Radio Observations
- GRB 090423: Fermi GBM T90 follow-up analysis results
- GRB 090423: optical limit
- GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
- GRB 090423: pseudo burst at z=1 and its relation to GRB 080913
- GRB 090423: CARMA mm observations
- GRB 090423: millimeter detection
- GRB 090426 Keck LRIS redshift
- GRB 090423: GROND second epoch imaging and refined SED
- GRB 090423: Fermi GBM observation (correction of isotropic equivalent energy)
- VLA radio observation of high-z GRB 090423
- GRB 090423: Y-band field calibration update/correction
- GRB 090423: Swift/BAT spectral lag results
- GRB 090423: energetic, luminosity and jet break
- GRB 090423: Fermi GBM observation
- GRB 090423: Ep,i - Eiso correlation
- GRB 090423: Refined TNG analysis
- GRB 090423 limiting magnitudes
- GRB 090423: VLT/ISAAC spectroscopy
- GRB 090423: Near infrared observation at Okayama Observatory
- GRB 090423: Deep z-band upper limit and confirmation of photo-z
- GRB 090423: TNG Amici spectrum
- GRB 090423: GROND detection and preliminary photo-z
- GRB 090423: NOT z-band limit
- GRB 090423: Correction to NIR photometry
- GRB 090423: Swift-XRT refined analysis
- GRB090423 - Swift/UVOT upper limits.
- GRB 090423: NIR photometry and evidence for spectral break
- GRB 090423: UKIRT data further analysis
- GRB 090423: Enhanced Swift-XRT position
- GRB 090423: Swift-BAT refined analysis
- GRB 090423: UKIRT K-band observations
- GRB 090423: P60 Observations
- GRB 090423: Faulkes Telescope South observations
- GRB 090423: Swift detection of a burst