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"3037 results found.
- Swift Trigger 457076: a possible GRB
- Swift-BAT trigger 456532 is not astrophysical
- GRB 110625A: NIR Source
- Konus-Wind observation of GRB 110618A
- IPN triangulation of GRB110618A (long duration, extremely intense)
- GRB 110610A: Suzaku WAM observation of the prompt emission
- GRB 110521A: Swift detection of a burst
- GRB 110422A: Update of Herschel FIR observation schedule
- GRB 110428A : Swift-XRT observations
- GRB 110428A: Fermi-LAT Detection
- GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
- GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
- GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
- GRB 110328A / Swift J164449.3+573451: NOT optical observations.
- GRB 110319A: Swift-XRT refined Analysis
- GRB 110305A: Swift detection of a burst
- GRB 110223A: Liverpool Telescope observations
- OT 110215: possible GRB from 2MASS J00264184+8324093
- GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
- GRB 110213B: P60 Optical Afterglow Candidate
- GRB 110212A: Swift XRT and UVOT observations
- GRB 110213B: Swift XRT observation
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213B: MAXI/GSC detection of a probable GRB
- GRB 110210A: Swift detection of a burst
- GRB 110207A: Swift-BAT refined analysis
- GRB 110205A: Possible Lick/Kast redshift
- GRB 110128A: Swift detection of a burst
- GRB 101225A: CQUEAN optical observation
- GRB 110107A: Swift-XRT afterglow confirmation
- Short GRB 110106A: MASTER OT observations
- GRB 110106B: Gemini-North / WHT detection of a fading afterglow
- GRB 110106B: WHT candidate afterglow
- GRB 101225A: Swift/UVOT Detection
- GRB101224A: MITSuME Okayama optical upper limits
- IPN triangulation of bright GRB 101123A
- GGRB 101023A: GROND detection of the optical-NIR afterglow
- GRB 101017A: Swift detection of a burst with optical counterpart
- Konus-Wind observation of GRB 101014A
- GRB 101014A: Fermi GBM detection
- MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
- GRB 100915A: TAROT Calern observatory optical observations
- GRB 100901A: TLS observations, SDSS calibration, decay slope
- Konus-Wind observation of GRB 100829A
- GRB 100901A: optical observation at Mt.Terskol
- GRB 100901A: optical observation at Mt.Terskol
- GRB 100901A: MASTER Optical Early Limits
- GRB 100823A: optical observations
- GRB 100807A: P200 Infrared Observations
- GRB 100807A: P60 Optical Afterglow Discovery
- GRB 100805A: Swift detection of a burst with an optical counterpart
- GRB 100802A: NOT optical observation
- GRB 100802A: ROTSE-III Optical Limits
- GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
- GRB 100727A: Swift/UVOT Upper Limits
- GRB 100718A: MASTER-Net optical prompt and alert observations
- GRB 100702A: Swift detection of a short burst
- Swift-BAT trigger 426048 is not a burst
- GRB 100513A: CrAO optical observations
- GRB 100526A: NOT optical upper limit
- GRB 100510A: MAXI/GSC detection
- GRB 100418A: Terskol optical observations
- GRB 100425A: Swift detection of a burst
- Swift Trigger 420256: ROTSE-III Optical Limits
- GRB 100420A: Swift detection of a burst
- GRB 100316C: BOOTES-3 observations
- GRB 100316D: Swift detection of a burst
- GRB 100316A: Enhanced Swift-XRT position
- GRB 100316B: Swift detection of a burst with optical counterpart
- GRB 100316A: Swift-XRT detection
- GRB100219A Akeno and Okayama MITSuME Optical Observation
- GRB 100203A Detected in Ground Analysis of BAT Data
- GRB 100122A: Fermi GBM detection
- Konus-Wind observation of GRB 091208A
- GRB 091208B, RIMOTS optical upper limits
- Short X-ray Transient Detection by MAXI/GSC
- GRB 091130: MASTER observations
- GRB 091120: MAXI GSC detection
- GRB 091117A: Swift/UVOT followup observations
- GRB 091024: optical observations
- GRB 091018: GROND observations
- GRB 091010 optical upper limits
- GRB090829: Fermi GBM Detection
- GRB 090817: aphotometry of USNO-B1.0 341-0096763
- GRB 090813: P60 Optical Afterglow Confirmation
- Swift trigger 358760 is probably a noise event
- GRB 090728: Swift detection of a burst
- IPN Triangulation of bright GRB 090720B
- GRB 090715B: VLA radio detection
- GRB 090717: Fermi GBM detection
- GRB090709A : WSRT Radio observation
- GRB 090704: Fermi GBM observation
- GRB 090704: a long GRB found in INTEGRAL off-line analysis
- GRB 090706: Fermi GBM detection
- GRB 090621B: GRT Optical Observation
- GRB 090618 : WSRT radio detection
- VLA radio detection of GRB 090618
- GRB 090424: WSRT Radio Observations
- GRB 090607: Swift detection of a burst
- GRB 090529C: Fermi GBM detection