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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"

6791 results found.

  1. GRB 230307A: Swift/UVOT detection
  2. GRB 230307A: Swift-XRT afterglow detection
  3. Alert from the HAWC Burst Monitor HAWC-230311A
  4. GRB 230308A: Fermi GBM detection
  5. GRB 230307A: ASO-S/HXI detection
  6. GRB 230228A: NUTTelA-TAO / BSTI Optical Limits
  7. GRB 230307A: Swift/BAT upper limits on the early afterglow
  8. GRB 230307A: Swift-XRT observations
  9. GRB 230307A: AstroSat CZTI detection
  10. Fermi-LAT gamma-ray observations of IceCube-230306A
  11. GRB 230228A: Swift-XRT refined Analysis
  12. GRB 230217A: Swift/UVOT Upper Limits
  13. GRB 230217A: Swift-XRT afterglow detection
  14. Fermi-LAT gamma-ray observations of IceCube-230220A
  15. GRB 230217A: Gemini-South Optical Observation
  16. GRB 230217A: Fermi GBM observation
  17. Fermi-LAT gamma-ray observations of IceCube-230217A
  18. GRB 230217A: Swift-XRT observations
  19. GRB 230216A: Swift-XRT refined Analysis
  20. GRB 230209B: Fermi GBM Observation
  21. Swift Trigger 1153670 is probably not a GRB
  22. GRB 221009A: Continued Swift Observations
  23. GRB 230204B: Swift/UVOT Upper Limits
  24. GRB 230204B: Fermi GBM detection
  25. GRB 230204B: Swift-XRT afterglow detection
  26. GRB 230205A: Swift-XRT refined Analysis
  27. GRB 230204B: GIT discovery of the likely optical afterglow
  28. GRB 230204A: Swift-XRT refined Analysis
  29. ZTF23aabmzlp/AT2023azs: Lulin 1m LOT optical observations
  30. Fermi-LAT gamma-ray observations of IceCube-230201A
  31. GRB 230129A: AstroSat CZTI detection
  32. GRB 230124A: Fermi GBM Observation
  33. Fermi-LAT gamma-ray observations of IceCube-230122A
  34. GRB 230123A: Swift-XRT refined Analysis
  35. GRB 230116C: Swift-XRT observations
  36. GRB 230116B: Fermi GBM observation
  37. GRB 230116D: 3.6m DOT optical upper limit
  38. GRB 230116D: SAO RAS further observations
  39. GRB 230116D: Swift-XRT refined Analysis
  40. GRB 230116D: GIT optical follow-up
  41. GRB 230116C: Swift detection of a burst
  42. Fermi-LAT gamma-ray observations of IceCube-230112A
  43. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
  44. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
  45. GRB 230111A: Fermi GBM Observation
  46. GRB 230102A: Fermi GBM Observation
  47. GRB 221231A: Fermi GBM Observation
  48. GRB 221231A: Swift-XRT afterglow detection
  49. GRB 221231A: Swift-XRT observations
  50. Fermi-LAT gamma-ray observations of IceCube-221229A
  51. GRB 221226A: Fermi GBM detection
  52. GRB 221226B: Fermi GBM Observation
  53. GRB 221226B: Swift-XRT refined Analysis
  54. Fermi-LAT gamma-ray observations of IceCube-221224A
  55. Fermi-LAT gamma-ray observations of IceCube-221223A
  56. GRB 221218A: 3.6m DOT optical upper limit
  57. GRB 221215A: Fermi GBM Detection
  58. Fermi-LAT gamma-ray observations of IceCube-221216A
  59. GRB 221216A: Fermi GBM observation
  60. GRB 221216A: Swift-XRT refined Analysis
  61. Fermi-LAT gamma-ray observations of IceCube-221210A
  62. GRB 221215A: Swift-XRT observations
  63. GRB 221209A: Fermi GBM observation
  64. GRB 221206B: Fermi GBM observation
  65. GRB 221206B: Swift-XRT observations
  66. GRB 221201A: Fermi GBM observation
  67. GRB 221202A: Swift-XRT refined Analysis
  68. GRB 221201A: Swift-XRT refined Analysis
  69. GRB 221126A: Fermi GBM observation
  70. Alert from the HAWC Burst Monitor HAWC-221128A
  71. Fermi-LAT gamma-ray observations of IceCube-221124A
  72. Alert from the HAWC Burst Monitor HAWC-221123A
  73. GRB 221120A: Fermi GBM observation
  74. GRB 221120A: Swift-XRT refined Analysis
  75. GRB 221120A: GIT upper limits on optical afterglow
  76. GRB 221119A: Fermi GBM detection
  77. GRB 221119A: Fermi-LAT detection
  78. GRB 221115A: Fermi GBM detection
  79. GRB 221110A: Swift-XRT refined Analysis
  80. GRB 221107A: Fermi GBM Observation
  81. GRB 221009A: Extended Bad Time Intervals for Fermi LAT data
  82. Fermi-LAT gamma-ray observations of IceCube-221104A
  83. GRB 221029A: Fermi GBM observation
  84. GRB 221028A: Swift-XRT refined Analysis
  85. GRB 221028A: 1.3m DFOT Optical upper limit
  86. GRB 221028A: HCT optical upper limit
  87. GRB 221028A: GIT optical upper limit
  88. GRB 221027B: Swift-XRT refined Analysis
  89. GRB 221027A: Fermi GBM detection
  90. GRB 221027A: Fermi-LAT detection
  91. GRB 221025A: Fermi GBM Observation
  92. GRB 221022A: Swift-XRT observations
  93. GRB 221024A: Swift-XRT refined Analysis
  94. GRB 221023A: Fermi GBM Observation
  95. GRB 221025A: Fermi-LAT detection
  96. GRB 221022A: Fermi GBM detection
  97. GRB 221023A: Fermi-LAT detection
  98. GRB 221022B: Fermi GBM detection
  99. GRB 221021A: Fermi GBM observation
  100. GRB 221017A: Swift-XRT observations

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