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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"3363 results found.
- GRB 030227: Kyoto optical observation
- IPN triangulation of GRB030119 (two large error boxes)
- IPN triangulation of GRB030117 (two large error boxes)
- IPN triangulation of GRB021219 - CORRECTION
- GRB021219: a long GRB localized by INTEGRAL
- IPN triangulation of GRB021206 (small error box)
- GRB021104: Optical Observations
- IPN triangulation of GRB021020 (smaller error box)
- GRB021016(=H2397): A Long GRB Localized by HETE
- IPN triangulation of GRB021008 (two small error boxes)
- GRB 021004: Optical measurement at OHP
- GRB 021004: Optical Photometry at 2.5 Days
- GRB021004: Update Bisei photometric data
- IPN triangulation of GRB020914
- Confirmation of IPN error box for GRB020910
- IPN triangulation of GRB020910
- Single IPN error box for GRB020904
- IPN triangulation of GRB020904
- GRB 020812: optical observation at Kyoto University
- GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
- GRB020812: optical observations
- IPN triangulation of GRB020708
- IPN triangulation of GRB020708
- GRB 020705: Optical observations
- GRB 020603, R-band observation
- GRB020531: optical observations
- GRB 020409: Optical Observations
- GRB020124 optical observations with RIBOTS/RIMOTS
- GRB 020321: Candidate X-ray Counterparts
- GRB011212: Optical Observations
- GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
- GRB011212: Optical observations at Gunma
- GRB011130 (=XRF011130): Further analysis of Chandra Target of
- IPN triangulation of GRB011121
- GRB 010629 Optical Observations
- GRB 010222
- IPN/RXTE TRIANGULATION OF GRB010126
- GRB010126, TNG R-band observations
- GRB010126 optical observations
- IPN TRIANGULATION OF GRB010126
- IPN triangulation of GRB001219
- IPN triangulation of GRB000911
- IPN localization of GRB000820
- IPN localization of GRB000811
- GRB000607, A SHORT, HARD BURST
- GRB000424, optical observations
- IPN localization of GRB991226
- GRB 991106, LOTIS Optical Observations
- IPN/NFI error box for GRB991014
- IPN error box for GRB990915 (=BATSE 7766)
- GRB990806 UBVRIJHK observations
- GRB990704, optical observations
- IPN error box for GRB990527
- IPN localization for GRB990506
- GRB 990316, Optical observations
- GRB990308, Possible new SGR~0209+70
- GRB990123, early optical counterpart detection
- GRB 981226 Optical Observations
- GRB 981226 optical observations
- GRB980326 IPN annulus
- Near-IR follow-up on GRB 971227
- Optical Observations of the GRB 971227 field
- GRB971227: Further CAHA R-band images