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.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
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