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').
- GRB 980703: ASM Position & Intensity
- GRB980703
- GRB980519 observation report
- GRB980703 optical followup
- SGR1627-41
- Radio observations of SGRs
- SGR1900+14 field optical observations
- GRB 980613 Near-IR observations
- GRB980613, optical observations
- GRB 980613: Optical transient and its host galaxy
- SGR1627-41, RXTE/ASM observations
- SGR1627-41, Refined IPN annulus location
- GRB 980613: Detection of the probable host galaxy
- Reduced error box of SGR 1627-41
- GRB 980613: BATSE Observations
- SGR1627-41, BeppoSAX-GRBM detections
- SGR 1627-41
- GRB 980613 Optical Observations
- GRB 980613 optical observations
- Discovery of a new SGR source, SGR1627-41
- GRB980613 Optical Observations
- GRB980613 observations from Palomar
- GRB980613 BeppoSAX-NFI follow up
- GRB 980613 new optical/IR observations
- GRB 980613 optical/IR obs.
- GRB980613 Near Infra-Red Observations
- GRB980611
- GRB980613, BeppoSAX WFC positions
- GRB971214 Secondary Standards
- SGR 1900+14
- GRB980519 Secondary Standards
- SGR1900+14
- SGR1900+14
- BATSE on-board GRB trigger change
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980519 I-band observations
- GRB 980519
- GRB980519 optical observations
- GRB 980519 Optical Observations
- GRB980519 BATSE Observations
- GRB970519, optical follow-up at Schmidt Calern
- GRB980519 optical observations
- GRB980519 Optical Observations
- GRB980519 Optical Observations
- GRB980519 IPN POSITION
- GRB980519 Optical Observations
- GRB 980519 Optical Observations
- GRB980519 optical observations
- GRB980515, BeppoSAX IAUC to be submitted
- BATSE on-board GRB trigger change
- GRB980519, BeppoSAX-WFC updated position
- GRB980519, BeppoSAX-WFC position
- GRB980515: SAX-WFC updated position
- BeppoSAX GRB ALERT: updated position of grb980515
- GRB 980425 Radio Light Curve
- GRB 980425 Brightness Temperature
- BSAX Observations of GRB980425 field
- IPN web site of GRBs
- GRB980425 BATSE observations
- SAX J0840.7+2248 Optical Observations
- GRB 980425 optical observations
- GRB980425: optical obs.
- GRB980425: Radio Observations
- GRB 980425 optical observations
- report on BSAX observations of GRB980425
- GRB 980425 optical observations
- GRB 980329 ROSAT observation
- GRB980326 X-ray Observations
- GRB980326, optical observations
- GRB980326, optical observations
- GRB980329, Fading IR counterpart to radio source
- GRByymmdd, Announcement of automation
- GRB980326 IPN annulus
- GRB980329
- GRB980329 Keck K-band observations
- GRB980329 sub-millimeter observations
- GRB980329 IPN annulus
- GRB980329 optical observations
- GRB980329 near-IR observations
- GRB980329 near-IR observations
- GRB980329 optical observations
- GRB980329 infrared observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB980329 optical observations
- GRB980329 VLA observations
- GRB980329 near IR observations
- GRB980329 optical observations
- GRB980329 optical observations
- GRB980329 optical observations
- GRB980326 optical observations
- GRB980326 optical observations
- GRB980326 optical observations
- GRB980326 optical observations
- GRB970508 SAO RAS optical observations
- Optical Observations of GRB 970508
- GRB 971214: Redshift from Keck Observations
- Near-IR follow-up on GRB 971227
- GRB971214: Keck R & I-band Observations