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').
66 results found.
- GRB 171205A: Likely association with low-z spiral galaxy
- LIGO/Virgo G194575: INAF-Asiago Telescope further analysis of iPTF candidates
- GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
- GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
- GRB 111211A: Detection of the SN with the 10.4m GTC
- GRB 111209A: Swift UVOT refined analysis
- GRB 111209A: Swift Burst of Interest
- GRB 101225A Late-time emission observed by Swift-BAT
- GRB 101225: Optical follow-up of the Christmas burst
- Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
- Redshift solution(s) for GRB101213A from Swift-XRT data
- GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
- GRB 100418A: Possible Evidence for a Supernova
- GRB 100316D: ATCA radio observations
- GRB 100316D: Pre-burst emission measured by BAT
- GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 100316D: Swift-BAT refined analysis
- GRB 080307: Swift-XRT Team refined analysis
- Discovery of Radio Emission from Transient in NGC 2770
- GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
- GRB 070419A, deep LBT photometry and possible supernova detection
- GRB 060218 / SN 2006aj Nebular Spectrum
- GRB 060218 (SN 2006aj): IR afterglow detection six months after the
- GRB 060614: SMARTS host galaxy observations
- GRB 060614: spectroscopy
- GRB 060614: optical observations
- GRB 060418 : IR afterglow observations
- GRB 060218SN 2006aj: optical observations at Rozhen Observatory
- GRB060218, optical observations
- GRB 060218/SN 2006aj, LNA optical observation
- GRB 060218/SN 2006aj, high resolution spectra
- GRB 060218: RTT150 optical observations
- GRB060218/SN 2006aj: optical observation in V
- GRB060218/SN 2006aj: optical observation
- GRB 060218 : GMRT observation [Correction and Improvement]
- GRB 060218/SN 2006aj: K-380 optical observations
- GRB 060218/SN 2006aj, SMARTS optical/IR observations
- GRB 060218/SN 2006aj: ABT observations
- GRB 060218/SN 2006aj: REM optical and near-infrared observations
- GRB 060218 : Radio upper limits from GMRT
- GRB 060218/SN 2006aj: WIRO optical observations
- GRB 060218/SN 2006aj: RBO optical observations
- GRB 060218: Refined analysis of the radio afterglow
- GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
- GRB 060218: rebrightening
- GRB 060218/SN 2006aj: optical observations
- GRB 060218: rebrightening
- GRB 060218: emergence of the underlying SN spectrum
- GRB 060218: Decline in r-band flux
- GRB 060218: spectroscopic observations
- GRB 060218: Further refined analysis of the Swift-BAT burst
- GRB 060218: Likely an underluminous GRB
- GRB060218: Optical Spectroscopy of GRB-SN
- GRB 060218: Optical Observations at Xinglong Obs.
- GRB060218: UV Detection and Light Curves
- GRB060218: Radio Afterglow Discovery
- GRB 060218: MDM Redshift
- GRB 060218: optical/nIR observations at La Palma
- Oddball GRB 060218, transient or GRB?
- Brightening of the Optical Counterpart of the Possible GRB 060218
- GRB 060218: MDM Observations
- GRB 060218: Pre-burst detection of a possible host galaxy
- Preliminary refined analysis of the Swift-BAT trigger 191157
- Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
- Subject: GRB 060218: Swift XRT Position
- GRB 060218: Swift-BAT detection of a possible burst