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"816 results found.
- GRB 101123A: Fermi GBM detection
- GRB 100906A: Fermi GBM observation
- IPN triangulation of GRB 100826A
- IPN triangulation of GRB100324B
- GRB 100302A: Optical observations at Crni Vrh
- Konus-Wind observation of GRB 100116A
- IPN Triangulation of GRB091120
- IPN Triangulation and Konus-Wind observaions of GRB090727B
- GRB 090618: Suzaku WAM observation of the prompt emission
- GRB090530: Swift XRT refined analysis
- IPN triangulation of very bright GRB 090427
- GRB 090425: Fermi GBM detection
- GRB 090408b: IPN Triangulation
- GRB 090328b: IPN Triangulation
- GRB 090323: WSRT Radio Detection
- IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
- Swift-BAT trigger 345396 is not a GRB
- Konus-Wind observation of GRB 090217
- IPN localization of GRB 090217
- GRB 081222: Gemini-N confirmation of redshift z=2.77
- GRB 081118: Swift-BAT refined analysis
- GRB 081024: Swift-XRT refined analysis
- GRB 081007: Swift-XRT Team refined analysis
- Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
- GRB080913: Swift/UVOT Upper Limits
- GRB 080913: Swift detection of a burst
- GRB 080906, Swift-BAT refined analysis
- GRB 080727B: Swift/UVOT Upper Limits
- GRB 080727B: Swift-XRT refined analysis
- GRB 080727B: Swift detection of a bright burst
- GRB 080725, Swift-BAT refined analysis
- GRB 080723B : a long GRB detected with INTEGRAL
- GRB 080613B, Swift-BAT refined analysis
- GRB080520: Swift/UVOT observations
- IPN triangulation of bright GRB 080513
- GRB 080514B: SuperAGILE/IPN GRB Localization
- GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
- GRB 080319b light curve by Pi-of-the-Sky
- GRB 080307: Swift/UVOT Upper Limits
- GRB 080307: Swift detection of a burst
- GRB080303: Swift XRT refined analysis
- IPN localization of GRB 080211
- IPN localization of very hard GRB 080204
- IPN triangulation of GRB080122
- IPN triangulation of very bright GRB 071125
- Swift/UVOT initial analysis of GRB071109
- GRB 071031, Swift-BAT refined analysis
- IPN search for a GRB associated with TAROT transient on August 31
- IPN Localization of GRB 070821 (long, very bright)
- GRB 070621: Swift-BAT refined analysis
- GRB 070520A, Swift-BAT refined analysis
- GRB 070517: Swift detection of a burst
- GRB 070512: IPN localization and Konus spectrum of a bright burst
- IPN triangulation of GRB070402
- GRB 070306, Swift-BAT refined analysis
- GRB 070220: MITSuME Okayama Optical Observation
- IPN-BAT localization of GRB070125 (very long duration, intense)
- IPN localization of GRB070124 (short duration, hard spectrum)
- Swift/BAT trigger #250033 is due to a known source during loss of
- Swift-BAT triggers 238544 and 238546 are not GRBs
- GRB 060908: PROMPT Detection of a Bright Counterpart
- IPN triangulation of GRB060806 (long, exceptionally bright)
- IPN triangulation of GRB060805B
- GRB060801: Radio Observations
- GRB 060607: Swift-BAT Refined Analysis
- GRB 060502B MDM Follow-up Observation
- GRB 060429: Refined IPN error box and Konus-Wind spectrum
- IPN triangulation of GRB060429 (short/hard)
- GRB 060427B: IPN localization of a short hard burst
- GRB 060219: Swift/UVOT Upper Limits
- GRB 060213: IPN localization
- IPN observations of SGR1806-20
- IPN triangulation and Konus spectrum of the bright short/hard GRB051103
- IPN triangulation of GRB051022 (=H3950)
- GRB050826: Swift/UVOT early upper limits
- GRB050826: Swift-BAT detection of a long burst
- GRB 050713A: XRT refined analysis
- GRB 050713A : Swift-BAT Refined Analysis
- GRB 050713: Swift detection of Bright Burst
- GRB 050306: Possible X-ray Afterglow Position from the Swift
- SGR1806-20: Swift-BAT observation of the 041227 super-flare
- IPN localization of giant flare from SGR1806-20
- GRB 041219: Radio Afterglow Detection
- GRB 041218 : Radio Observations
- IPN triangulation of GRB040924 (H3564)
- IPN/HETE localizations of GRB040810 (=H3489)
- IPN/HETE triangulation of GRB040802 (=H3485)
- XRF040701: Second-Epoch Chandra Observations
- IPN Summary of SGR1806-20 Activity in 2004
- IPN triangulation of GRB040425 (=H3183)
- IPN triangulation of GRB040228 (H3066, H3067)
- IPN triangulation of an intermediate burst from SGR1806-20
- IPN triangulation of GRB031219 (large error box)
- IPN triangulation of GRB031214 (short/hard; very intense; small error box)
- IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
- IPN triangulation of GRB031201 (large error box)
- IPN triangulation of GRB031130 (large error box)
- IPN/HETE localization of GRB031109 (=H2917; large error box)
- IPN detection of activity from SGR1806-20
- IPN triangulation of GRB031114 (large error box)