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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').
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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

59 results found.

  1. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  2. Fermi GRB 241104A: Global MASTER-Net observations report
  3. LIGO/Virgo/KAGRA S240422ed: Zwicky Transient Facility contuinued observations of S240422ed and candidate analysis
  4. Swift GRB240123.46: Global MASTER-Net observations report
  5. GRB 230808A: Fermi GBM Detection
  6. GRB 230803A: AstroSat CZTI detection
  7. Fermi GRB 230723A: Global MASTER-Net observations report
  8. Fermi GRB 220211B: Global MASTER-Net observations report
  9. Fermi GRB 210621A: Global MASTER-Net observations report
  10. Fermi trigger No 645047470: Global MASTER-Net observations report
  11. Swift GRB 210610B: Global MASTER-Net observations report
  12. Fermi GRB 210503A: Global MASTER-Net observations report
  13. IceCube-201021A: No neutrino counterpart candidates in ANTARES search
  14. IceCube-201014A: No neutrino counterpart candidates in ANTARES search
  15. IceCube-200916A: No neutrino counterpart candidates in ANTARES search
  16. HAWC-200907A: No Neutrino Counterpart detected with ANTARES
  17. Fermi GRB 200605A: Global MASTER-Net observations report
  18. GRB 200524A: AstroSat CZTI detection
  19. Fermi trigger No 601841483: Global MASTER-Net observations report
  20. GRB 200125A: Swift-BAT refined analysis
  21. Swift GRB191226.02: Global MASTER-Net observations report
  22. GRB 191031D: AGILE/MCAL observations
  23. Swift GRB190718.2 Global MASTER-Net observations report
  24. Fermi trigger No 581645543 Global MASTER-Net observations report
  25. LIGO/Virgo S190426c: Discovery Channel Telescope Follow-Up of ZTF19aassfws
  26. LIGO/Virgo S190412m: Palomar Gattini-IR Wide-field Infrared Follow-up
  27. GRB 181023A: Swift/UVOT Upper Limits
  28. GRB 180614A: Swift/UVOT Upper Limits
  29. GRB 180311A: Swift/UVOT Upper Limits
  30. GRB 170711A: Swift/UVOT Upper Limits
  31. GRB 160425A: Swift/UVOT Detection
  32. GRB 160313A: Swift/UVOT Upper Limits
  33. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  34. GRB 151031A: Swift/UVOT Detection
  35. GRB 151022A: Swift/UVOT Upper Limits
  36. Konus-Wind observation of GRB 150403A
  37. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  38. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  39. Konus-Wind observation of GRB 140508A
  40. GRB 140103A: MASTER-Net early OT detection
  41. GRB 131229A: Swift-BAT refined analysis
  42. GRB 130929A: Swift/UVOT Upper Limits
  43. GRB 130615A: Swift/UVOT Upper Limits
  44. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  45. GRB 120728A: Swift/UVOT Upper Limits
  46. Swift detection of Ginga 0834-430
  47. Konus-Wind observation of GRB 120328B
  48. GRB 111123A: Swift/UVOT Upper Limits
  49. GRB 110402A: Swift/UVOT detection of afterglow candidate
  50. GRB 100413A: Swift-XRT Refined Analysis
  51. GRB 080723A: Swift/UVOT Upper Limits
  52. Swift/UVOT observations of GRB080409
  53. GRB 071112C: Optical and NIR data observed with KANATA
  54. GRB 050730: XRT refined analysis
  55. GRB050712: Swift UVOT Observation of Afterglow Emission
  56. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  57. IPN BURST POSITION
  58. GRB 991105: BATSE Observations
  59. BeppoSAX NFI observations of GRB 980703

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