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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"3338 results found.
- GRB 030429: IR photometry with IRSF/SIRIUS
- GRB030501: TAROT candidate afterglow present in archival images
- GRB 030429: confirmation of afterglow candidate
- GRB030418: Kiso near infrared observations
- GRB030329: Near Infrared Observations at Gunma
- GRB 030329: fading X-ray afterglow with RXTE
- XMM-Newton observation of GRB030227
- GRB 030115: Further IR observations with IRSF/SIRIUS
- GRB 030115: IR observations with IRSF/SIRIUS
- GRB 021201, optical observations
- GRB 021201 (short/hard), NOT observations
- Chandra observation of the IPN error box of GRB021201 (short/hard)
- Detection of activity from SGR 1900+14 with the RXTE/PCA
- GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
- GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
- SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
- SGR-like Bursts from the AXP 1E 2259+586
- GRB 020418, optical/near-IR observations
- GRB020531, optical observations
- XRF020427: Chandra Observations and Candidate X-ray Counterparts
- GRB 020321: Candidate X-ray Counterparts
- GRB 020331: Candidate Optical Afterglow
- GRB 020331: NIR Observations
- GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
- VLT observations of GRB 020124: The fading optical/near-infrared afterglow
- GRB 011121: NIR observations, host galaxy?
- GRB 011121: Detection of Bright IR Counterpart
- SGR 1900+14 : RXTE observations
- GRB 001204: Ks observations
- GRB 001212 possible OA in 2MASS
- GRB 001109: deep JHK upper limits
- The Likely Optical/Infrared Afterglow of GRB 001011
- SGR 1806-20 burst activity
- GRB 000418: Detection of the Host Galaxy
- X-ray Afterglow of GRB 000529
- IR observations of GRB991216
- BeppoSAX NFI Observation of GRB991106
- GRB980703: Radio transient