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"14803 results found.
- Konus-Wind observation of GRB 140825A
- GRB 140828A: Fermi GBM observation
- IPN Triangulation of GRB 140824B
- GRB 140818B: TLS observations
- GRB 140824B: Swift observations
- GRB 140817A: NOT optical observations
- Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
- GRB 140818A: GROND confirmation of afterglow candidate
- GRB140819A: Deep GROND Upper Limits
- Fermi trigg_num 430148973: OSN I-band observations
- Konus-Wind observation of GRB 140818A
- GRB 140818B : Correction to GCN 16713
- GRB140818B : GROND afterglow candidate
- GRB 140818A - Fermi GBM Detection
- GRB 140818A: Correction to GCN 16702
- Konus-Wind observation of GRB 140817A
- GRB 140818A Tiled Swift observations
- GRB 140818A: MAXI/GSC detection
- GRB 140817A: Fermi GBM Detection
- GRB 140815A: A long GRB detected by INTEGRAL
- GRB 140814A: MAXI/GSC detection
- GRB 140808A: Confirmation of the Swift-XRT afterglow
- GRB140809A: Fermi GBM observation
- GRB 140810A: Fermi GBM observation
- Konus-Wind observation of GRB 140810A
- GRB140810A: Fermi-LAT detection
- Swift trigger 609139 is probably 4U 1850-03
- Swift observations of possible GRB 140809A candidate
- Konus-Wind observation of GRB 140808A
- GRB 140801A: GROND Afterglow detection, unbroken decay
- GRB140801A: Swift/XRT further observations
- GRB 140730A: GROND Upper limits
- Konus-Wind observation of GRB 140801A
- GRB 140801A: Fermi GBM observation
- GRB 140801A: NOT afterglow confirmation
- Konus-Wind observation of GRB 140729A
- GRB 140729A: Fermi-GBM detection
- Correction to Fermi-LAT GCN Circular 16633
- GRB 140729A Tiled Swift observations
- GRB 140729A: Fermi-LAT detection
- GRB 140723A: LCO-Sutherland optical candidate retraction
- GRB 140723A: MASTER optical observation
- Konus-Wind observation of GRB 140723A
- GRB 140723A: Fermi GBM detection
- GRB 140723A Tiled Swift observations
- GRB 140723A: Fermi-LAT detection
- Konus-Wind observation of GRB 140721A
- GRB 140716A: GROND confirmation of the afterglow
- Konus-Wind observation of GRB 140716A
- GRB 140713A: 10.4-m GTC deep optical observation
- Swift observations of a flare from UX Ari
- GRB 140716A found in ground analysis of Swift-BAT data
- GRB 140713A: Fermi GBM detection
- GRB 140713A: T100 observations
- GRB 140710B: a long GRB detected with INTEGRAL
- GRB 140709A: Continued RATIR Optical and NIR Observations
- GRB 140710A: Gemini-N redshift of likely host
- GRB 140710A: P60 Confirmation of Afterglow
- GRB 140710A: GROND Detection of NIR Afterglow Candidate
- GRB 140709A: 10.4m GTC optical decay
- GRB 140709B: Fermi GBM detection
- GRB 140709B: OSN optical limit
- GRB 140709A: Fermi GBM detection
- GRB 140709A: BOOTES-2 and OSN optical observations
- GRB 140706A: Fermi GBM detection
- GRB140706A: GROND detection of the Optical/NIR afterglow
- GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
- SGR 1935+2154: Swift-BAT observations of additional short soft events
- GRB 140621A: Suzaku WAM observation of the prompt emission
- GRB 140703A: Fermi GBM detection
- GRB 140619C: Suzaku WAM observation of the prompt emission
- GRB 140629A: MITSuME Akeno Optical observation
- Fermi 425667201: optical counterpart search
- Konus-Wind observation of GRB 140629A
- GRB 140629A: TNG redshift confirmation
- GRB140629A: VATT optical observations
- GRB 140629A: MITSuME Ishigakijima Optical Observation
- GRB 140629A : Virtual Telescope optical observations
- GRB 140629A : Xinglong TNT optical observation
- GRB 140628A: GROND observation of the afterglow
- GRB 140623A: further Swift-XRT observations
- GRB 140626A: GROND Afterglow Candidate
- GRB 140619B: Suzaku WAM observation of the prompt emission
- GRB 140623A / iPTF14cyb: Fermi GBM detection
- Konus-Wind observation of GRB 140621A
- Konus-Wind observation of GRB 140619A
- Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
- GRB 140620A / iPTF14cva: Konkoly optical observations
- GRB 140622A: An unusual short event, Swift-BAT refined analysis
- GRB 140622A: GROND Upper limits
- GRB 140620A: Swift/UVOT Detection
- Konus-Wind observation of GRB 140619C
- GRB 140620A / iPTF14cva: Fermi GBM observations
- Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
- GRB 140619B: Fermi-LAT Detection
- GRB 140619B: Fermi GBM detection of a short GRB
- Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
- Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
- GRB 140606A: BTA and OSN optical observations
- GRB 140614C found in ground analysis of BAT data