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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.

Advanced Search Examples (click to copy):

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

11099 results found.

  1. GRB 200615A: Fermi GBM Final Real-time Localization
  2. GRB 200613A: Swift/UVOT Detection
  3. GRB 200613A: Xinglong-2.16m optical observations
  4. Fermi GRB 200614A: Global MASTER-Net observations report
  5. IceCube-200614A - IceCube observation of a high-energy neutrino candidate track-like event
  6. GRB 200614A: Fermi GBM Final Real-time Localization
  7. GRB 200613A: Kitab and AbAO optical afterglow observations, host galaxy candidate
  8. GRB 200613A: Swift-XRT afterglow detection
  9. GRB 200613A: Candidate afterglow from OAJ
  10. GRB 200612A: Fermi GBM detection
  11. Fermi GRB 200613A: Global MASTER-Net observations report
  12. GRB 200613A: Swift ToO observations
  13. GRB 200613A: Fermi-LAT detection
  14. GRB 200613A: Fermi GBM observation
  15. BALROG localization (Fermi Trigger 613719013 / GRB 200613229)
  16. GRB 200613A: Fermi GBM Final Real-time Localization
  17. Fermi trigger No 613630183: Global MASTER-Net observations report
  18. GRB 200612A: Swift detection of a burst
  19. GRB 200609A: Insight-HXMT/HE detection
  20. Konus-Wind detection of GRB 200605A
  21. GRB 200605A: CALET Gamma-Ray Burst Monitor detection
  22. GRB 200609A: Fermi GBM Final Real-time Localization
  23. GRB 200607B: AstroSat CZTI detection
  24. Fermi GRB 200607B: Global MASTER-Net observations report
  25. GRB 200607B: Fermi GBM Final Real-time Localization
  26. Fermi GRB 200607A: Global MASTER-Net observations report
  27. IPN triangulation of GRB 200605A (short)
  28. GRB 200607A: Fermi GBM Final Localization
  29. GRB 200607A: BALROG localization (Fermi Trigger 613212114 / GRB 200607362)
  30. GRB 200530A: Fermi GBM detection
  31. GRB 200530A: CALET Gamma-Ray Burst Monitor detection
  32. Fermi GRB 200605A: Global MASTER-Net observations report
  33. GRB 200605A: Fermi GBM Final Real-time Localization
  34. GRB 200530A: Fermi-LAT detection
  35. GRB 200604A: AstroSat CZTI detection
  36. Fermi trigger No 612988790: Global MASTER-Net observations report
  37. Fermi GRB 200604A: Global MASTER-Net observations report
  38. GRB 200604A: Fermi GBM Final Real-time Localization
  39. Konus-Wind observation of GRB200528A
  40. GRB 200601A: Insight-HXMT/HE detection
  41. Fermi-LAT Gamma-ray Observations of IceCube-200530A
  42. GRB 200529A: MITSuME Akeno optical upper limits
  43. Fermi GRB 200601A: Global MASTER-Net observations report
  44. GRB 200601A: Fermi GBM Final Real-time Localization
  45. IceCube-200530A: not observable by Fermi-GBM
  46. Fermi GRB 200531A: Global MASTER-Net observations report
  47. GRB 200531A: Fermi GBM Final Real-time Localization
  48. Konus-Wind observation of GRB 200524A
  49. IceCube-200530A - IceCube observation of a high-energy neutrino candidate event
  50. GRB 200530A: AstroSat CZTI detection
  51. Fermi GRB 200530A: Global MASTER-Net observations report
  52. GRB 200530A: Fermi GBM Final Real-time Localization
  53. GRB 200528A: CAHA Upper Limit
  54. GRB 200529A: Fermi GBM Detection
  55. Fermi GRB 200529B: Global MASTER-Net observations report
  56. Fermi trigger No 612429771: Global MASTER-Net observations report
  57. GRB 200528A: CALET Gamma-Ray Burst Monitor detection
  58. GRB 200529B: Fermi GBM Final Real-time Localization
  59. GRB 200528A: Assy optical upper limit
  60. GRB 200529A: KAIT Optical Afterglow Confirmation
  61. GRB 200529A: Fermi GBM Final Real-time Localization
  62. GRB 200528A: Fermi GBM Observation
  63. GRB 200528A: 1.3m DFOT Optical Upper Limits
  64. GRB 200528A: MITSuME Akeno optical upper limits
  65. GRB 200528A: Potential host galaxy in PanSTARRS, SDSS and WISE
  66. GRB 200528A: Fermi GBM Final Real-time Localization
  67. GRB 200524A: Assy optical observations
  68. GRB200524A: UVOT detection
  69. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  70. Fermi GRB 200525A: Global MASTER-Net observations report
  71. GRB 200524A: CrAO optical observations
  72. GRB 200524A: Kitab observatory afterglow observations
  73. GRB 200525A: Fermi GBM Final Real-time Localization
  74. GRB 200524A: AstroSat CZTI detection
  75. GRB 200524A: Further Liverpool Telescope observations
  76. Fermi-LAT Gamma-ray Observations of IceCube-190523A
  77. GRB200521A: ASIM observation
  78. GRB 200524A: KAIT Optical Observations
  79. GRB 200524A: MITSuME Akeno optical observation
  80. GRB 200524A: Swift-XRT afterglow detection
  81. GRB 200524A: OAJ multicolor afterglow detection
  82. GRB 200524A: Fermi GBM detection
  83. GRB 200524A: CAHA multicolor afterglow detection
  84. GRB 200524A: CrAO observations of ZTF20abbiixp
  85. Fermi GRB 200524A: Global MASTER-Net observations report
  86. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  87. GRB 200524A: Swift ToO observations
  88. GRB 200524A: Fermi-LAT detection
  89. Konus-Wind detection of short/hard GRB 200521A
  90. IPN triangulation of GRB 200521A (short)
  91. IceCube-200523A: Upper limits from Fermi-GBM Observations
  92. IceCube-200523A - IceCube observation of a high-energy neutrino candidate event
  93. Fermi GRB 200522B: Global MASTER-Net observations report
  94. GRB 200522B: Fermi GBM Final Real-time Localization
  95. GRB 200514B: Fermi GBM observation
  96. Fermi trigger No 611676654: Global MASTER-Net observations report
  97. Fermi trigger No 611605955: Global MASTER-Net observations report
  98. Fermi GBM Sub-Threshold Detection of GRB 200517A
  99. IPN triangulation of GRB 200514B (short)
  100. Fermi trigger No 611434353: Global MASTER-Net observations report

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