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').
- GRB030329, optical observation
- IPN triangulation of GRB030421 (annulus)
- MASTER:optical observations GRB030418
- MASTER:optical observations probable GRB030414
- GRB030329: 444 AAVSO Measurements
- IPN triangulation of GRB030419 (annulus)
- MASTER:optical observations GRB030416
- ROTSE-III prompt optical detections of GRB 030418
- GRB030418: Upper limits from recent and historical observations.
- GRB030418: Kiso near infrared observations
- GRB 030418: Optical afterglow
- GRB 030418: Finder for afterglow candidate
- GRB 030418: Optical afterglow candidate
- GRB 030329 OT position
- GRB030329: Optical Observations
- OT GRB 030329: early UBVRcIc spectral evolution
- GRB030329, UBVRI polarimetry, R-polarization
- GRB 030329: SARA Optical Observations
- OT GRB 030329: early spectrum
- GRB030329: VR Photometry at TNG
- GRB030324: Candidate Optical Afterglow (Erratum)
- GRB030324: Candidate Optical Afterglow
- IPN triangulation of GRB030414 (small error box)
- GRB 030413: Optical Observations
- GRB 030329 Rc observations
- IPN triangulation of GRB030413 (small error box)
- IPN triangulation of GRB030410 (annulus)
- Superluminal motion in GRB 030329 (Correction)
- Superluminal motion in GRB 030329
- GRB 030329 and SN 2003dh
- GRB030329, optical position
- GRB 030329 VLBA Observations
- CORRECTION TO IPN TRIANGULATION OF GRB050403
- IPN triangulation of GRB030406 (small error box)
- IPN triangulation of GRB050403 (small error box)
- IPN triangulation of GRB030403 (annulus)
- GRB 030329: BVRI photometry at Asiago
- GRB 030329, light curve flattens
- GRB 030329: VLT V-band photometry
- If the SN/GRB connection confirmed
- GRB 030329: Supernova Confirmed
- GRB030329: RTT150 optical observations
- GRB030329: Near Infrared Observations at Gunma
- GRB030329: HET spectroscopic monitoring
- Kiso observation of the GRB030329 at April 6
- GRB 030329, color evolution
- GRB030328, UBVRcIc field photometry
- GRB030329: Optical observcations
- GRB030329: BV photographic observations
- GRB 030329 Optical observations
- GRB 030329, color evolution
- GRB 030329: possible color change
- GRB030329: RTT150 optical observations
- GRB 030329: Supernova Spectrum Emerging
- GRB030329: Kiso B and R band observations
- GRB030329: RTT150 optical observation
- GRB030329: More AAVSO VR obs
- GRB030328: R upper limit after 6 hours by MASTER
- GRB 030329: BV photographic observations
- GRB 030329: SARA Optical Observations
- GRB 030329: SARA Optical Observations
- GRB030329, fading resumes
- GRB 030329, BVRI photometry
- GRB030329: Optical observations
- SDSS 0.5m PT observations of GRB030329 (correction)
- SDSS 0.5m PT observations of GRB030329
- GRB 030329, Optical observations
- GRB 030329, nearby galaxies
- GRB030329, cessation of fading
- GRB030329: final R-band light curve by MASTER
- GRB030329 - more 15 GHz radio data
- GRB030329 Radio 23/43/90 GHz observations at Nobeyama
- GRB 030329: Sub-millimeter detection
- GRB 030329: SARA Optical Observations
- GRB 030329: SARA Optical Observations
- OT GRB light curves and SN predictions
- GRB030329, optical observation
- GRB030329, optical observation
- GRB030329, new UBVRcIc field photometry
- GRB 030329, light curve and SN prediction
- GRB030329: optical observations at Tokyo Tech
- GRB 030329: optical observations
- GRB030329: multiple re-brightening phases
- GRB 030329, BRI photometry
- GRB030328: Full Observation, X-ray Fading and Spectrum Measured
- GRB 030329 , SPM optical observations
- GRB030329: Optical observations at Teramo
- GRB 030329: Radio observations at GMRT
- GRB030329: more 15GHz observations
- Further AAVSO V,B,R observations of GRB030329
- GRB 030329: Additional Mt. Laguna Optical Observations
- GRB 030329: SARA Optical Observations
- GRB 030329: Observations with ANDICAM
- GRB030329: Optical observations
- GRB030329: further optical photometry and evidence for a light curve discontinuity
- GRB 030329: Correction to GCN 2056
- GRB 030329: fitting parameters and re-brightening
- GRB 030329: KAIT optical photometry
- GRB030329 Further RBO Optical Observations
- triangulation of GRB 030331 (single error box)