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"20511 results found.
- GRB 110305A: GROND Detection of Optical Afterglow
- GRB101225A: early EVLA Observations of Christmas Burst
- Swift/UVOT observations of GRB110223A
- GRB GRB 110223A: MASTER VWF early optical observations
- Swift/UVOT observations of GRB110223b
- GRB 110223A: Liverpool Telescope observations
- GRB 110223B: GROND Detection of Optical Afterglow Candidate
- GRB 110223A: Observations from BOOTES-2
- OT 110215: Further NIR observations from NOT of the GRB candidate
- GRB 110213B: Swift/UVOT observations
- Swift XRT and UVOT Observations of OT 110215
- OT 110215: NIR observations from NOT of GRB candidate
- GRB 110213A: optical observations in CrAO
- GRB 110213B: GROND observations of the optical/NIR afterglow
- GRB 110213A: optical observations in Mondy
- GRB110205A: EVLA Observations
- OT 110215: possible GRB from 2MASS J00264184+8324093
- Swift/UVOT observations of GRB110210a.
- GRB 110213B: Gemini South Redshift
- GRB 110210A: ROVOR Upper Limit
- GRB 110213A: YNAO-GMG Observations
- GRB 110213B: P60 Optical Afterglow Candidate
- GRB 110213A: TNT optical observations
- GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
- GRB 110212A: Swift XRT and UVOT observations
- Swift GRB110213A: interesting behaviour
- GRB 110205A: Konkoly optical observations
- GRB 110213A: Swift/UVOT refined analysis
- GRB 110213A: THO optical observations
- GRB 110213B: MAXI/GSC detection of a probable GRB
- GRB 110213A: Lightbuckets Optical Observations
- GRB 110213A: optical observations
- GRB 110213A: KAIT observations
- GRB 110213A: GRAS011 optical observations
- GRB 110213A: Bok Telescope Redshift
- GRB 110213A: ROTSE-III Detection of Optical Counterpart
- GRB 110213A: P60 Optical Afterglow Detection
- GRB 110201A: Subaru/MOIRCS Ks-band photometry
- GRB 110205A: detection of optical linear polarization from CAHA
- GRB 110210A: optical upper limit
- GRB 110201A: optical observations
- GRB 110208A: Magellan confirmation of the optical afterglow
- Swift/UVOT observations of GRB110208a
- GRB 110208A: Potential afterglow from Magellan
- GRB 110207A: Swift-XRT observations
- GRB 110208A: Magellan optical observations
- GRB 110206A: SMARTS optical/IR afterglow decay
- GRB 110205A: optical observations in Mondy observatory
- GRB 110205A : HCT optical observations
- GRB 110206A: SMARTS optical/IR afterglow candidate observations
- GRB 110207A: TAROT Calern observatory optical observations
- GRB 110205A - Continued PAIRITEL NIR Observations
- GRB 110206A: GROND detection of afterglow candidate
- GRB 110205A: WSRT radio observation
- GRB 110206A: UVOT detection of afterglow candidate
- GRB110205A: CARMA 3mm Observations
- GRB 110207A: MASTER prompt and early optical observations
- GRB 110206A: Swift detection of a probable X-ray afterglow
- GRB 110206A: TAROT La Silla observatory optical observations
- GRB 110205A: Lightbuckets Optical Observations
- GRB110205A: SMA 1.3mm Observations
- GRB 110205A: Swift/UVOT Continuing Observations
- GRB 110205A: Lulin optical observations and temporal decay index
- Observations GRB 110205A
- GRB 110205A: Newcastle Observatory Optical Observations
- GRB 101225A is likely at z~0
- GRB 110205A: NOT redshift confirmation
- GRB 110205A: FAST Redshift
- GRB 110205A: GRAS005 optical observations
- GRB 110205A: PAIRITEL NIR Afterglow Detection
- GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
- GRB 110205A: Liverpool Telescope Afterglow Confirmation
- GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
- GRB 110205A: TAROT Calern observatory optical detection
- Swift/UVOT observations of GRB110201A
- GRB 110201A: MASTER optical observations
- GRB110112B: EVLA Observations
- GRB101224A: EVLA Observations
- GRB110112A: EVLA Observations
- GRB 101112A: Maidanak and CrAO optical observations
- GRB110128A: TNG NIR observations
- GRB 110128A: Swift/UVOT observations
- GRB 110128A: WHT redshifts of nearby field galaxies
- GRB 110128A: VLT/X-shooter redshift
- GRB 110128A: TAROT Calern observatory upper limits
- GRB 110106B, radio observations
- GRB 110120A: MASTER optical observations
- GRB 110106A: CrAO optical observations
- GRB 110120A: MASTER optical observations
- GRB110119: Swift/UVOT Detection
- GRB 110119A: PAIRITEL NIR Afterglow Detection
- GRB110106A, mm-radio observations
- GRB 101219B: tentative redshift and spectroscopic supernova detection
- GRB 101219B: GROND detection of a SN signature
- GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
- The Christmas burst GRB 101225A - optical spectroscopy with GTC
- GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
- GRB 101225A: HST observations - no host detected
- GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
- GRB 110112A: WHT candidate afterglow/host galaxy