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"- GRBv111225A: Xinglong TNT optical afterglow
- GRB 111225A: Enhanced Swift-XRT position
- GRB 111225A: Super-LOTIS early detection
- GRB 111225A: TAROT Calern observatory optical detection
- GRB 111225A: TAROT Calern observatory optical observations
- GRB 111225A: Swift detection of a burst with an optical counterpart
- GRB111222A: GMG optical observation
- GRB 111222A: Xinglong TNT observation
- GRB 111222A: Swift/UVOT Observations
- GRB 111222A: Swift-XRT observations
- Konus-Wind observation of GRB 111222A
- IPN Triangulation of GRB 111222A (short/hard/intense)
- GRB 111210A: optical upper limit of Mt. Terskol observatory
- Trigger 510075 is not a GRB
- GRB 111215A: EVLA observations
- GRB111215A: CARMA Detection
- XRT GRB Catalogue now live and online
- GRB 111103B: optical upper limit
- GRB 110820A: optical observations in Maidanak observatory
- GRB 111103A: optical upper limit of Mt. Terskol observatory
- GRB 111215B: Suzaku WAM observation of the prompt emission
- GRB 111211A: optical ovservations at Mt. Terskol observatory
- GRB111215A: optical upper limit
- GRB 111215B: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 111215B
- GRB 111215B: Swift-XRT observations
- GRB 111205A: Confirmation of X-ray Afterglow
- IPN Triangulation of GRB 111215B (long/intense)
- GRB111215A: Pre-Outburst Palomar 48 inch Imaging
- GRB 111215A: WHT, LT and NOT imaging
- GRB 111215A: TNG K-band observations
- GRB 111215A: MITSuME Okayama Optical upper limits
- GRB 111215A: Swift/UVOT Upper Limits
- GRB 111215A: Swift-XRT refined Analysis
- Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
- GRB 111215A: Enhanced Swift-XRT position
- GRB 111215A: Swift-BAT refined analysis
- GRB 111215A: OSN I-band observations
- GRB 111215A: MASTER-Net optical prompt and follow up observations
- GRB 111215A, Optical Observations
- GRB 111215A: MITSuME Akeno Optical upper limits
- GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
- GRB 111215A: GMG optical upper limit
- GRB 111215A : Xinglong TNT upper limit
- GRB 111215A: Swift detection of a burst
- GRB 111201A, the review of the sky area in plate archive
- GRB 111212A: GROND observations
- GRB 111211A: Swift/UVOT Detection
- GRB 111211A: VLT/X-shooter redshift
- Konus-Wind observation of GRB 111211A
- GRB 111211A: NOT afterglow confirmation
- GRB 111212A: Swift-XRT refined Analysis
- GRB 111211A: Swift/XRT target of opportunity observation
- GRB 111212A: Swift/UVOT Upper Limits
- GRB 111212A: Swift-BAT refined analysis
- GRB 111212A: Enhanced Swift-XRT position
- GRB 111212A: Swift-XRT observations
- GRB 111211A: GROND afterglow candidate
- GRB 111212A: Swift detection of a burst
- GRB 111211A: SuperAGILE localization of a long GRB
- GRB 111210A: Xinglong TNT upper limit
- GRB 111209A - ATCA 34GHz upper limit
- Konus-Wind observation of GRB 111209A
- GRB 111210A: GROND observations
- GRB 111210A: SDSS prior imaging
- GRB 111210A: Swift-XRT refined Analysis
- GRB 111210A: MITSuME Okayama Optical upper limits
- GRB 111208A: Swift-XRT refined analysis
- GRB 111210A: Gemini-North candidate counterpart
- GRB 111209A: Rebrightening seen by GROND
- GRB111210A: MITSuME Okayama J-band upper-limit
- GRB 111210A: Swift/UVOT Upper Limits
- GRB 111210A: Spectral lag analysis
- GRB 111210A: Enhanced Swift-XRT position
- GRB 111210A: Swift-BAT refined analysis
- GRB 111210A: Swift detection of a burst
- GRB 111209A: IRTF NIR Imaging/Spectroscopy
- GRB 111209A: VLT/X-shooter redshift
- GRB 111209A: GROND Afterglow observations
- GRB 111209A optical limit by "Pi of the Sky"
- GRB 111209A: PROMPT optical observations of early afterglow
- GRB 111208A: Lightbuckets Optical Observations
- GRB 111209A: Swift-XRT refined Analysis
- GRB 111209A: Swift UVOT refined analysis
- GRB 111209A: Swift Burst of Interest
- GRB 111209A, Swift-BAT refined analysis
- GRB 111209A: Enhanced Swift-XRT position
- GRB111209A : planned XMM-Newton observation
- GRB 111209A: TAROT La Silla observatory optical light curve analysis
- GRB 111205A: GROND observations
- GRB 111209A: Faulkes Telescope North observations
- GRB 111209A: REM NIR detection
- GRB 111209A: TAROT La Silla observatory optical detection
- GRB 111209A: Swift detection of a long burst with an optical counterpart
- GRB 111208A: Swift XRT/UVOT observations
- GRB 111205A: Swift XRT Observations
- GRB 111207A found in ground analysis of BAT data
- GRB 111208A found in ground analysis of BAT data
- Konus-Wind observation of GRB 111205A
- IPN Triangulation of GRB 111205A (long/hard/intense)