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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
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"

7 results found.

  1. LIGO/Virgo/KAGRA S231113bw: Updated Sky localization, EM Bright Classification, and Source Classification
  2. LIGO/Virgo/KAGRA S231113bw: Zwicky Transient Facility observations
  3. LIGO/Virgo/KAGRA S231113bw: GROWTH-India coverage and upper limits
  4. LIGO/Virgo S231113bw: upper limits from AGILE/MCAL
  5. LIGO/Virgo/KAGRA S231113bw: Upper limits from Fermi-GBM Observations
  6. LIGO/Virgo/KAGRA S231113bw: Coverage and upper limits from MAXI/GSC observations
  7. LIGO/Virgo/KAGRA S231113bw: Identification of a GW compact binary merger candidate

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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