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').
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"- GRB 120324A: Enhanced Swift-XRT position
- GRB 120324A: Liverpool Telescope optical candidate
- GRB 120324A: UVOT Finding Chart Observation
- GRB 120324A: Swift detection of a burst
- Simultaneous optical images of Swift pointing are available by GRT
- GRB 120316A : Suzaku WAM observation of the prompt emission
- GRB 120320A: Zadko optical observations
- GRB 120320A, the review of the sky area in plate archives
- GRB 120316A: Fermi-GBM and Fermi-LAT Observations
- GRB 120229A: Magellan observations and limit on an optical afterglow
- GRB 120320A: Swift/UVOT Upper Limits
- GRB 120320A: MITSuME Okayama Optical upper limits
- GRB 120320A , optical observations
- GRB 120320A: BOOTES-4 optical upper limit
- GRB 120320A: Swift-XRT refined Analysis
- GRB 120320A, Swift-BAT refined analysis
- GRB 120320A: Gemini-N and UKIRT observations
- Fermi GBM trigger 120319.237 is not a GRB
- GRB 120320A: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 120316A
- IPN Triangulation of GRB 120316A
- GRB 120320A: MASTER optical observations
- GRB 120320A: Swift detection of a burst
- GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
- GRB 111228A: possible detection of the SN with the TNG
- Trigger 517876 is a Swift detection of GX 5-1
- GRB 120302A: Swift XRT refined analysis
- GRB 120312A, the review of the sky area in plate archives
- GRB 120312A: CrAO optical upper limit
- GRB 120312A: Gemini and UKIRT imaging
- GRB 120311A, the review of the sky area in plate archives
- Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
- Fermi GBM triggers 120305.186, 120305.802 and 120306.823 are not GRBs
- GRB 120311A: Optical follow-up
- GRB 120311B: Optical follow-up
- GRB 120311A: C88 optical limits
- GRB 120312A: Swift/UVOT Upper Limits
- GRB 120312A: MASTER-NET optical observations
- GRB 120312A: WHT candidate afterglow
- GRB 120312A: NOT observations
- GRB 120312A: Swift-XRT refined Analysis
- GRB 120312A: Swift-BAT refined analysis
- GRB 120311A: VLT/X-shooter observations
- GRB 120311B: C88 optical limits
- GRB 120312A: Swift detection of a burst
- GROND observations of GRB 120311A
- GRB 120311B: Swift/UVOT Upper Limits
- GRB 120311B: MITSuME Okayama Optical upper limits
- GRB 120311B: Faulkes Telescope North observations
- GRB 120311B: Swift-XRT refined Analysis
- GRB 120311A: Swift-XRT refined Analysis
- GRB 120311B: Enhanced Swift-XRT position
- GRB 120311B: Swift-BAT refined analysis
- GRB 120311B: Swift-XRT observations
- GRB 120311A, Swift-BAT refined analysis
- GRB 120311B: Swift detection of a burst
- GRB 120311A: Swift/UVOT Upper Limits
- GRB 120311A: CAHA 1.23m I-band early observations
- GRB 120311A: Enhanced Swift-XRT position
- GRB 120311A: Swift-XRT observations
- GRB 120311A: Liverpool Telescope optical candidate
- GRB 120311A: Swift detection of a burst
- GRB 120308A : LOAO optical observation
- GRB 120308A: RTT150 optical observations
- GRB 120302A: RTT150 optical observations
- GRB 120308A: 1.23m CAHA I-band observations
- GRB 120308A: Further PAIRITEL NIR Observations
- GRB120308A: MITSuME Ishigakijima Optical Upper Limits
- GRB 120308A: Swift/UVOT Detection
- GRB 120308A: Swift-XRT refined Analysis
- GRB 120308A: Enhanced Swift-XRT position
- GRB 120308A: Swift-BAT refined analysis
- GRB 120308A: IAC80 I-band observations
- GRB 120308A: PAIRITEL NIR observations
- GRB 120308A: confirmation of the optical afterglow
- GRB 120308A: Liverpool Telescope optical afterglow candidate
- GRB 120308A: Swift detection of a burst
- GRB 120305A: D50 optical limits
- GRB 120305A: Swift spectral lag analysis
- GRB 120302A, the review of the sky area in plate archives
- GRB 120302A: Fermi GBM Observation
- GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
- GRB 120305A: Swift/UVOT Upper Limits
- GRB 120305A: EVLA deep limit on a radio counterpart
- GRB 120305A: Swift-XRT refined Analysis
- GRB 120305A: Enhanced Swift-XRT position
- GRB 120305A: Swift-BAT refined analysis
- GRB 120305A - Liverpool Telescope Observations
- GRB 120305A: MASTER-NET early optical observations
- GRB 120305A: Swift detection of a short burst
- GRB 120302A: GROND detection of an afterglow candidate
- GRB 120302A, Swift-BAT refined analysis
- GRB 111222A: Swift observation on 2012 February 06/07
- GRB 120302A found in ground analysis of BAT data
- GRB 120229A: Spectral lag analysis
- GRB 120229A, Swift-BAT refined analysis
- GRB 120229A: Swift detection of a short burst
- Konus-Wind observation of GRB 120226A
- GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
- GRB 120226A: Fermi-LAT data analysis