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"26265 results found.
- Konus-Wind observation of GRB 120709A
- GRB 120711A: GROND photometric redshift
- GRB 120711A: Fermi GBM observation
- Continued Skynet/PROMPT observations of GRB120711A
- GRB 120711A: ROTSE-III confirm of Optical Counterpart
- Swift detection of GRB 120711B or a new Galactic transient
- Skynet/PROMPT Observations of GRB120711A
- GRB 120709A: Fermi GBM detection
- GRB 120709A: Swift-XRT observations
- GRB 120709A: Matched filter analysis of Fermi-LAT data
- Konus-Wind observation of GRB 120707A
- IPN Triangulation of GRB 120707A
- GRB 120709A: Fermi-LAT Detection
- GRB 120707A: Fermi GBM Detection of a Bright Burst
- GRB 120703A: Swift/UVOT Detection
- GRB 120703A: Fermi GBM detection
- GRB 120703A: Swift-XRT refined Analysis
- GRB 120703A: Swift-BAT refined analysis
- GRB 120624B Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 120703A
- GRB 120703A: NOT optical observation
- GRB 120701A: Swift/UVOT Detection
- GRB 120701A: GROND detection of the afterglow
- GRB 120703A: Swift detection of a bright burst with an optical afterglow
- Swift Trigger 525554 is noise
- GRB 120701A: Swift-XRT afterglow detection and analysis
- GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
- GRB 120701A: Swift-BAT refined analysis
- GRB 120630A: NOT optical source within the XRT error circle
- Swift Trigger 525554 is probably not a GRB
- Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
- GRB 120624B: Swift/UVOT Upper Limits
- Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Swift-XRT observations
- GRB 120624B: GROND upper limits
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
- Swift detection of Ginga 0834-430
- GRB 120624B: NOT optical upper limit
- Swift detection of IGR J17062-6143
- GRB 120624B, Swift-BAT refined analysis
- Konus-Wind observation of GRB 120624B
- GRB 120624B: Swift detection of a burst
- GRB 120624A: Fermi GBM observation
- GRB 120624B: Fermi-LAT Detection
- GRB 120624B: Fermi GBM detection
- IPN Triangulation of GRB 120624A (short/intense)
- Swift Trigger 524949: Noise fluctuation near a galaxy
- Swift trigger 524642 / SwJ1910.2-0546
- GRB 120602A: Suzaku WAM observation of the prompt emission
- Swift Trigger 524642 is Swift J1910.2-0546
- Trigger 524584: Swift detection of Algol
- Swift triggers (#524542) on a Galactic source
- GRB 120612A: Swift/UVOT observations
- GRB 120612A: Swift-XRT refined Analysis
- GRB 120612A: Swift-BAT refined analysis
- GRB 120612A: Swift detection of a burst
- GRB 120603A: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 120603A
- IPN Triangulation of short GRB 120603A
- Fermi GBM trigger 120602.539 is not a GRB
- GRB 120519A: Suzaku WAM observation of the prompt emission
- Fermi Gamma-ray Burst Monitor trigger 120527.573 is not a GRB
- GRB 120512A: Suzaku WAM observation of the prompt emission
- GRB 120521B: Fermi GBM observation
- GRB 120521C: Early Tautenburg limits
- GRB 120521A: GROND Upper limits
- GRB 120521C: Swift-XRT refined Analysis
- GRB 120521C: Swift-BAT refined analysis
- GRB 120521C: Swift/UVOT Upper Limits
- GRB 120521B: Swift/UVOT Upper Limits
- GRB 120521C: MASTER optical limit
- GRB 120521B: GROND Upper limits
- GRB 120521A: Swift-XRT refined Analysis
- GRB 120521C: PAIRITEL NIR Upper Limits
- GRB 120521C: WHT optical observations
- GRB 120521C - NOT optical limits
- GRB120521C: Liverpool Telescope observations
- GRB 120521C: TAROT Calern observatory optical observations
- GRB 120521C: Swift detection of a burst
- GRB 120521B: Swift-BAT refined analysis
- GRB 120521B: Swift-XRT refined Analysis
- Swift starts a new program to find fainter transients
- IPN Triangulation of GRB 120519A (short/hard)
- GRB 120521A: Swift/UVOT Upper Limits
- GRB 120521A: Swift-BAT refined analysis
- GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
- GRB120521B: Faulkes Telescope South observations
- GRB 120521B: TAROT La Silla observatory optical observations
- GRB 120521B: Swift detection of a burst
- GRB 120521A: TAROT La Silla observatory optical observations
- GRB 120521A: Swift detection of a short burst
- GRB 120514A : Suzaku WAM observation of the prompt emission
- Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
- GRB 120514A: GROND upper limits
- GRB 120514A: Swift/UVOT Upper Limits
- GRB 120514A: Swift-XRT refined Analysis
- GRB 120514A: Swift-BAT refined analysis
- GRB 120514A: TAROT Calern observatory optical observations
- GRB 120514A: Swift detection of a burst
- Fermi GBM Trigger 358364818 is not a GRB