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"19670 results found.
- Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Swift-XRT observations
- GRB 120624B: GROND upper limits
- GRB 120624B: NIR counterpart candidate from HAWKI
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
- Swift detection of Ginga 0834-430
- GRB 120624B: NOT optical upper limit
- Swift detection of IGR J17062-6143
- GRB 120624B: optical observations
- GRB 120624B, Swift-BAT refined analysis
- GRB 120624B: Swift detection of a burst
- GRB 120624B: Fermi-LAT 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
- IPN Triangulation of GRB 120602A (long/very bright)
- GRB 120612A: Swift/UVOT observations
- GRB 120612A: Swift-XRT refined Analysis
- GRB 120612A: Swift-BAT refined analysis
- GRB 120612A: Enhanced Swift-XRT position
- GRB 120612A: BOOTES-3 optical upper limit
- GRB 120612A: Swift detection of a burst
- GRB 120603A: Suzaku WAM observation of the prompt emission
- GRB 120519A: Suzaku WAM observation of the prompt emission
- GRB 120512A: Suzaku WAM observation of the prompt emission
- GRB 120521C: EVLA Localization of Afterglow
- GRB 120521C: EVLA 22 GHz Detection
- GRB 120521B: Fermi GBM observation
- GRB 120521C: Early Tautenburg limits
- GRB 120521C: EVLA 22 GHz Upper Limit
- 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: XRT light curve (Correction to GCN 13326)
- GRB 120521A: Swift-XRT refined Analysis
- GRB 120521C: PAIRITEL NIR Upper Limits
- GRB 120521C: Enhanced Swift-XRT position
- 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 120521B: Enhanced Swift-XRT position
- 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: Enhanced Swift-XRT position
- 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: Swift/UVOT Upper Limits
- GRB 120514A: Swift-XRT refined Analysis
- GRB 120514A: Enhanced Swift-XRT position
- GRB 120514A: Swift-BAT refined analysis
- GRB 120514A: TAROT Calern observatory optical observations
- GRB 120514A: Swift detection of a burst
- GRB 120510A: Swift XRT and UVOT observations
- Fermi/GBM detection of a burst from the magnetar 1E 2259+5
- Swift detection of 4U 1630-47
- IPN Triangulation of bright GRB 120426A
- Swift Trigger 520928 is a noise event
- Swift Trigger 520928 is probably not a burst
- GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
- GRB 120422A GROND observations
- GRB 120422A: EVLA Detection
- GRB 120422A: Gemini redshift of candidate host
- GRB 120422A: Zadko observatory - Gingin optical observations
- GRB 120422A: Swift-XRT refined Analysis
- GRB 120422A: A Swift/UVOT Detection
- GRB 120422A: Enhanced Swift-XRT position
- GRB 120422A: Swift-BAT refined analysis
- GRB 120422A: Swift detection of a burst
- GRB 120419A: Swift-XRT and UVOT observations
- Swift Trigger 519874 is a noise event
- SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
- Swift Trigger 519874 is probably a noise event
- Trigger 519868: Swift detection of SGR1806-20
- GRB 120404A: optical observations in Mondy observatory
- GRB 120404A: optical observations
- GRB 120404A, Optical Observations
- GRB 120404A: EVLA Detection
- GRB120404A: GROND observations show steeply decaying afterglow
- GRB120404A: MOA optical observations of the initial rise afterglow
- GRB 120404A: VLT/X-shooter redshift confirmation
- GRB 120404A: Swift/UVOT Detection