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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"

11112 results found.

  1. GRB 141225A: MASTER-SAAO first OT detection
  2. Swift XRT and UVOT observations of GRB141222A
  3. Konus-Wind observation of GRB 141222A
  4. IPN Triangulation of GRB 141222A (very intense)
  5. GRB 141222A: Fermi GBM detection
  6. GRB 141222A: Fermi-LAT detection
  7. GRB 141221A: Fermi GBM observation
  8. Konus-Wind observation of GRB 141220A
  9. GRB 141220A: Fermi GBM observation
  10. Fermi Gamma-ray Burst Monitor trigger 440728127 / 141220020 is not a GRB
  11. IPN Triangulation of GRB 141207A
  12. GRB 141207A: Suzaku WAM observation of the prompt emission
  13. GRB 141202A: Suzaku WAM observation of the prompt emission
  14. GRB 141215A: Fermi GBM detection
  15. IPN Triangulation of GRB 141215A (long/intense)
  16. GRB 141207A: Swift-XRT afterglow candidate detection
  17. Konus-Wind observation of GRB 141207A
  18. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  19. GRB141207A: Discovery Channel Telescope Optical Observations
  20. GRB 141207A: Swift-UVOT Observations
  21. GRB 141207A: Fermi GBM detection
  22. GRB 141207A: Swift-XRT observations
  23. GRB 141207A Tiled Swift observations
  24. GRB 141207A: Fermi-LAT Detection
  25. GRB 141205A: Fermi GBM detection
  26. GRB 141205A Short hard GRB found in ground analysis of BAT data
  27. Konus-Wind observation of GRB 141202A
  28. GRB 141202A: Fermi GBM Detection
  29. IPN Triangulation of GRB 141202A (short/hard)
  30. GRB 141124A​: iPTF upper limits​
  31. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  32. GRB 141118A: Fermi GBM Detection
  33. GRB 141118A: iPTF Optical Observations
  34. IPN Triangulation of GRB 141118A
  35. Konus-Wind observation of GRB 141102A
  36. GRB 141102A: Fermi-LAT detection
  37. GRB 141102A: Fermi GBM detection
  38. GRB 141031A: Fermi GBM detection
  39. GRB 141028A: SAO RAS Zeiss-1000 photometry
  40. GRB 141028A: Continued RATIR Observations
  41. GRB 141028A: P60 Observations and Decay Index
  42. IPN triangulation of GRB 141029B
  43. GRB 141029B: Fermi GBM detection
  44. GRB 141028A: Swift-XRT observations
  45. GRB 141028A: LCOGTN observations
  46. GRB 141028A: VLT/X-shooter redshift of z=2.33
  47. GRB141028A: Gemini-North redshift
  48. GRB 141028A: RATIR Optical and NIR Observations
  49. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  50. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  51. IPN triangulation of GRB 141028A
  52. GRB 141028A Tiled Swift observations
  53. GRB 141028A: Fermi GBM detection
  54. GRB 141028A: Fermi-LAT detection
  55. Fermi Gamma-ray Burst Monitor trigger 141026452 is not a GRB
  56. Fermi Gamma-ray Burst Monitor trigger 141025734 is not a GRB
  57. GRB141022A: Fermi GBM Detection
  58. GRB141022B: Fermi GBM Detection
  59. Fermi Gamma-ray Burst Monitor trigger 141014781 is not a GRB
  60. Konus-Wind observation of GRB 141011A
  61. IPN Triangulation of GRB 141011A (short/hard)
  62. GRB 141011A: Fermi GBM detection
  63. GRB 141004A: Fermi GBM observation
  64. Konus-Wind observation of GRB 141005A
  65. GRB 141005A: Swift/UVOT Upper Limits
  66. GRB 141005A: Fermi GBM Detection
  67. GRB 140928A: Swift-XRT follow-up observations
  68. GRB 140928A: MAXI-GSC detection
  69. GRB140928A: Gemini-South observation
  70. Konus-Wind observation of GRB 140928A
  71. GRB 140928A: LCO-Cerro Tololo further observations
  72. IPN Triangulation of GRB 140928A
  73. GRB 140928A: LCO-Cerro Tololo observations
  74. GRB 140928A: Fermi GBM detection
  75. GRB 140928A: GROND Afterglow Candidate
  76. GRB 140928A: Swift-XRT observations
  77. GRB 140928A: Fermi-LAT detection
  78. GRB 140919A: Fermi GBM observation
  79. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  80. GRB 140916B: iPTF Optical Observations
  81. Fermi GBM trigger 140913075 is not a GRB
  82. GRB 140907A: MASTER optical observations
  83. GRB 140907A: Fermi GBM Detection
  84. GRB 140906B: Fermi GBM Detection of a Long GRB
  85. GRB 140906A - Fermi GBM Detection
  86. GRB 140906A: iPTF optical transient candidates
  87. GRB 140901B: Swift XRT observation
  88. GRB 140901B: Fermi GBM detection
  89. GRB 140901B found in ground analysis of BAT data
  90. GRB 140901A: Fermi GBM detection
  91. IPN Triangulation of GRB 140901A (short/hard/very intense)
  92. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  93. GRB 140829A: Fermi GBM Detection
  94. GRB 140829A: iPTF optical observations
  95. GRB 140828A: Fermi GBM observation
  96. IPN Triangulation of GRB 140824B
  97. GRB 140824B: Swift observations
  98. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  99. GRB 140824B: Fermi GBM Detection
  100. GRB 140821A: Fermi GBM Detection

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