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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"

6667 results found.

  1. GRB 110205A: GRAS005 optical observations
  2. GRB 110205A: PAIRITEL NIR Afterglow Detection
  3. GRB 110205A: Swift detection of a burst with an optical candidate
  4. GRB 110128A: Fermi GBM detection
  5. GRB 110201A: Swift-XRT refined Analysis
  6. GRB 110125A: Fermi GBM detection
  7. GRB 101112A: Maidanak and CrAO optical observations
  8. GRB 110128A: Swift-XRT refined Analysis
  9. GRB 110123A: Fermi GBM detection
  10. GRB 110120A: Fermi LAT detection
  11. GRB 101225A: CQUEAN optical observation
  12. GRB 110119A: Fermi GBM detection
  13. GRB 110120A: Fermi GBM detection
  14. GRB 110119A: Swift-XRT refined Analysis
  15. GRB 110119A: PAIRITEL NIR Afterglow Detection
  16. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  17. GRB 110107A: Swift-XRT afterglow confirmation
  18. GRB 110112A: Swift-XRT refined Analysis
  19. GRB110112A: TNT optical afterglow candidate
  20. GRB 110107A: Swift-XRT Afterglow Candidate
  21. GRB 110106B: Fermi GBM detection
  22. GRB 110106B: Swift-XRT refined Analysis
  23. GRB 110106A: Swift-XRT refined Analysis
  24. GRB 110102A: Swift-XRT refined Analysis
  25. GRB 110102A: Fermi GBM observation
  26. GRB 101225A: WHT observations
  27. GRB 101225A: Swift-XRT refined Analysis
  28. GRB 101224A: Fermi GBM observation
  29. GRB 101224A: Swift-XRT refined Analysis
  30. GRB 101219B: Swift-XRT refined Analysis
  31. GRB 101219B: Fermi GBM observation
  32. GRB 101219A: Swift-XRT refined Analysis
  33. GRB 101219A: SARA-N Upper Limit
  34. GRB 101213A: Fermi GBM observation
  35. GRB 101213A: Swift-XRT refined Analysis
  36. GRB 101204A: Swift-XRT refined Analysis
  37. GRB 101204A Swift-XRT/UVOT afterglow candidate
  38. GRB 101201A: Fermi GBM observation
  39. GRB 101201A: Swift-XRT refined Analysis
  40. GRB 101123A: Fermi GBM detection
  41. GRB 101117B: Swift-XRT refined analysis
  42. GRB 101114A: Confirmation of the X-ray afterglow
  43. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  44. GRB 101112A: Fermi GBM detection
  45. GRB 101112A: optical observations
  46. GRB 101112A - XRT source detection/analysis
  47. GRB 101030A : MOA optical observation
  48. GRB 101030A : Swift XRT refined analysis
  49. GRB 101024A: Swift XRT refined analysis
  50. GRB 101023A: miniTAO/ANIR NIR detection
  51. GRB 101024A: Fermi GBM observation
  52. GRB 101023A: Fermi GBM observation
  53. GRB 101023A: Swift-XRT Team Refined Analysis
  54. GRB 101011A: miniTAO/ANIR NIR upper limits
  55. GRB 101017A: miniTAO/ANIR NIR upper limits
  56. GRB 101017A: Swift XRT refined analysis
  57. GRB 101014A: Fermi LAT detection
  58. GRB 101014A: Fermi GBM detection
  59. GRB 101011A: XRT Refined Analysis
  60. GRB 101008A: Fermi GBM observation
  61. GRB 101008A: Swift-XRT refined analysis
  62. GRB 100728B: X-shooter redshift
  63. Refined analysis shows Swift Trigger 435520 is not a GRB
  64. GRB 100924A: Fermi GBM observation
  65. GRB 100915B: Fermi GBM observation
  66. GRB 100915A: Swift/UVOT Upper Limits
  67. GRB 100915A: Swift-XRT refined analysis
  68. GRB 100910A: Fermi GBM detection
  69. GRB 100909A: Swift-XRT refined analysis
  70. GRB 100901A: optical observation in Maidanak, break confirmation
  71. GRB 100909A: Swift target of opportunity observation
  72. GRB100906A: R band observations
  73. GRB 100906A: Fermi GBM observation
  74. GRB 100906A: TLS Monitoring
  75. GRB 100906A: Swift-XRT refined analysis
  76. GRB 100906A: TLS Multicolor Observations
  77. GRB 100901A: TLS observations, SDSS calibration, decay slope
  78. GRB 100905A: Swift-XRT refined analysis.
  79. GRB 100902A: Swift XRT refined analysis
  80. GRB 100901A: TLS Observations: Break?
  81. GRB 100901A: Swift-XRT Team refined analysis
  82. GRB 100901A - NOT optical observation
  83. GRB 100901A: Swift-BAT refined analysis
  84. GRB 100725B: Maidanak optical upper limit
  85. GRB 100823A: Swift XRT refined analysis
  86. GRB 100814B: Fermi GBM detection
  87. GRB 100816A: Fermi GBM observation
  88. GRB100816A Swift-XRT refined analysis
  89. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  90. GRB 100814A: Fermi GBM observation
  91. GRB 100814A: Swift-XRT refined analysis
  92. GRB 100807A: Swift XRT refined analysis
  93. GRB 100805A: Swift-XRT Refined Analysis
  94. GRB 100805A: GRAS 002 optical observations
  95. GRB 100802A: Fermi GBM observation
  96. GRB 100728B: optical photometry of ISON-NM
  97. GRB 100713A: second epoch Maidanak optical observation
  98. GRB 100802A: XRT refined analysis
  99. GRB 100728B: Lick Observations
  100. GRB 100728B: Swift-XRT Refined Analysis

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