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"502 results found.
- IPN Triangulation of GRB 141104A (long/very bright)
- IPN Triangulation of GRB 141011A (short/hard)
- IPN Triangulation of GRB 140901A (short/hard/very intense)
- IPN Triangulation of GRB 140825A (very intense/long)
- IPN triangulation of GRB 140810A
- IPN Triangulation of GRB 140428B (short/hard)
- IPN Triangulation of GRB 140308A
- IPN Triangulation of GRB 140306A
- IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
- IPN Triangulation of GRB 131118A
- IPN Observations of GRB 130925A
- GRB 130912A: Swift/UVOT Upper Limits
- GRB 130907A: MASTER refined analysis
- IPN triangulation of GRB 130828A - error box
- IPN triangulation of GRB130821A
- IPN Triangulation of GRB 130521B
- Refined IPN Triangulation of GRB 130502B
- IPN Triangulation of GRB 121118B (long/intense)
- IPN Triangulation of long GRB 120919B
- IPN Triangulation of long GRB 120919A
- IPN Triangulation of GRB 120911B (long/bright)
- GRB120816A: OPTIMA discovery of optical counterpart
- IPN Triangulation of GRB 120728B (long/intense)
- IPN Triangulation of GRB 120707A
- IPN Triangulation of GRB 120602A (long/very bright)
- Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
- Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
- IPN Triangulation of GRB 111016B (long duration, intense)
- GRB 111008A: Swift/UVOT Upper Limits
- IPN triangulation of GRB 110918A (long duration, extremely intense)
- IPN triangulation of GRB110825A (very intense, long-duration)
- GRB 110820A: Swift/UVOT Upper Limits
- IPN triangulation of GRB110815A (long, intense)
- IPN triangulation of GRB 110808B (short/hard/intense)
- IPN triangulation of GRB110802A (short/hard burst)
- GRB 110715A: Swift/UVOT Detection
- IPN triangulation of GRB110618A (long duration, extremely intense)
- IPN triangulation of the bright GRB110406A
- GRB 110213B: Swift/UVOT observations
- IPN Localization of GRB101130 (possible short duration burst)
- IPN triangulation of GRB 100826A
- GRB 100728B: Continued KAIT observations
- IPN triangulation of GRB100324B
- IPN Triangulation of GRB091120
- IPN Triangulation and Konus-Wind observaions of GRB090727B
- GRB 090510: correction to GCN 9344
- Konus-Wind observation of GRB 090510
- GRB 090429B: Swift/UVOT Upper Limits
- IPN triangulation of very bright GRB 090427
- GRB 090408b: IPN Triangulation
- GRB 090328b: IPN Triangulation
- IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
- IPN localization of GRB 090217
- GRB081203A: Swift/UVOT grism redshift
- Revised table for GRB 081011 UVOT detections
- GRB081011: UVOT detection of an optical afterglow
- IPN triangulation of bright GRB 080513
- GRB 080514B: SuperAGILE/IPN GRB Localization
- GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
- IPN localization of GRB 080211
- IPN localization of very hard GRB 080204
- IPN triangulation of GRB080122
- IPN triangulation of very bright GRB 071125
- GRB 071003: OA power-law decay indices from KAIT
- IPN search for a GRB associated with TAROT transient on August 31
- IPN Localization of GRB 070821 (long, very bright)
- GRB 070512: IPN localization and Konus spectrum of a bright burst
- IPN triangulation of GRB070402
- 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
- IPN triangulation of GRB060806 (long, exceptionally bright)
- IPN triangulation of GRB060805B
- 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 060213: IPN localization
- IPN observations of SGR1806-20
- IPN triangulation and Konus spectrum of the bright short/hard GRB051103
- IPN triangulation of GRB051022 (=H3950)
- GRB050813: SWIFT/UVOT observation
- IPN localization of giant flare from SGR1806-20
- IPN triangulation of GRB040924 (H3564)
- IPN/HETE localizations of GRB040810 (=H3489)
- IPN/HETE triangulation of GRB040802 (=H3485)
- 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)
- IPN triangulation of GRB031107 (two large error boxes)
- IPN triangulation of GRB031108 (large error box)