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').
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.
Lucene Examples (click to copy):
subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
32 results found.
- GRB 201029A: Swift-XRT refined Analysis
- GRB 170714A: NOEMA non-detection of the Bastille Day Burst
- GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
- GRB 130925A: HST imaging
- GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
- GRB 130925A: 3mm observations with CARMA
- GRB 130925A/Sw J0244-2609: mm observations at PdBI
- NuSTAR observations of GRB 130925A
- GRB 130925A: continuing Swift/XRT monitoring
- IPN Observations of GRB 130925A
- Fermi LAT Upper Limits on GRB 130925A
- GRB 130925A: Swift/UVOT Detection of the Host Galaxy
- GRB 130925A: Swift/UVOT Upper Limits
- GRB 130925A: sub-mm non-detection with SMA
- GRB 130925A: optical upper limit
- GRB 130925A: Continued RATIR Optical and NIR Observations
- GRB 130925A: Fermi GBM Detection
- Konus-Wind observation of GRB 130925A
- Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
- GRB 130925A: RATIR Optical and NIR Observations
- GRB 130925A Swift-BAT refined analysis
- GRB 130925A: Historical non-detection from Rosat-HRI
- Fermi GBM detection of GRB 130925A and a possible precursor
- GRB 130925A: Swift-XRT refined Analysis
- GRB 130925A: Initial Similarities to Swift J1644+57
- GRB 130925A: TAROT La Silla observatory optical observations
- GRB 130925A: Enhanced Swift-XRT position
- GRB 130925A: VLT/X-shooter redshift
- GRB 130925A: VLT/UVES observations
- GRB 130925A: MAXI/GSC detection
- GRB 130925A: GROND afterglow candidate
- GRB 130925A: Swift detection of a burst