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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"

26228 results found.

  1. GRB 100302A: Swift-XRT refined analysis
  2. GRB 100302A: Optical observations at Crni Vrh
  3. GRB 100302A, Swift-BAT refined analysis
  4. GRB 100302A: Skynet/DAO Observations
  5. GRB 100302A: Swift detection of a burst
  6. GRB 100224B: Fermi GBM detection
  7. GRB 100219A: GAO 150cm telescope Optical Observation
  8. GRB 100224A SHB found in ground analysis of BAT data
  9. GRB 100225A: Fermi LAT detection
  10. GRB 100225A: Fermi GBM detection
  11. GRB 100223A: Fermi GBM detection
  12. GRB
  13. GRB 100219A: XRT refined analysis
  14. GRB 100216A: Swift/UVOT Observations
  15. GRB100219A Akeno and Okayama MITSuME Optical Observation
  16. GRB 100219A: GROND observations
  17. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  18. GRB 100216A: XRT Refined Analysis
  19. GRB 100219A: Swift-BAT refined analysis
  20. GRB 100218A : Fermi GBM detection
  21. GRB 100219A: Swift detection of a burst
  22. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  23. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  24. GRB 100213B: GRT Optical Observation
  25. GRB 100213A: GRT Optical Observation
  26. GRB 100213A: Swift-BAT refined analysis
  27. GRB 100213B: Swift/UVOT Upper Limits
  28. GRB 100213A: Swift/UVOT Upper Limits
  29. GRB 100213B: PAIRITEL NIR Upper Limits
  30. GRB 100213B: Swift-BAT refined analysis
  31. GRB 100213B: Swift XRT refined analysis
  32. GRB 100213A: SARA observations
  33. GRB 100213A: Swift XRT refined analysis
  34. GRB 100213B: Swift detection of a burst
  35. GRB 100213A: Swift detection of a burst
  36. Swift/UVOT observations of GRB120212A
  37. GRB 100212A: LOAO R-band Detection/V-band Observation
  38. GRB 100212A: Fermi GBM detection
  39. GRB 100212A: Swift XRT refined analysis
  40. GRB 100212A: Swift-BAT refined analysis
  41. GRB 100212A: Swift detection of a burst
  42. GRB 100205B: Fermi GBM detection
  43. GRB 100206A: GROND upper limits
  44. GRB 100206A: Swift/UVOT Upper Limits
  45. GRB 100206A: YNAO-GMG observations
  46. GRB 100206A, RIMOTS optical upper limits
  47. GRB 100205A: GROND upper limits
  48. GRB 100206A: Swift-XRT refined analysis
  49. GRB 100206A: Fermi GBM observation
  50. GRB 100206A: Swift-BAT refined analysis
  51. GRB 100206A: Swift detection of a short hard burst
  52. GRB 100130B: Fermi GBM detection
  53. GRB 100113A: Fermi GBM detection
  54. GRB 100205A: Swift-BAT refined analysis
  55. GRB 100205A: Swift UVOT upper limits
  56. GRB 100205A: Swift XRT refined analysis
  57. GRB 100203A: Swift XRT and UVOT refined analyses
  58. GRB 100205A: Gemini-South Observations
  59. GRB 100205A: Super-LOTIS early observations
  60. GRB 100131A: Suzaku WAM observation of the prompt emission
  61. GRB 100205A: Swift detection of a burst
  62. GRB 100203A Detected in Ground Analysis of BAT Data
  63. GRB 100131A: Fermi GBM detection
  64. GRB 100119A: Suzaku WAM observation of the prompt emission
  65. Konus-Wind observation of GRB 100119A
  66. GRB 100122A: Fermi GBM detection
  67. GRB 100116A: Suzaku WAM observation of the prompt emission
  68. GRB 100115A: Swift-XRT refined analysis
  69. GRB 100119A: Swift-BAT refined analysis
  70. GRB 100119A: Swift detection of a burst
  71. Konus-Wind observation of GRB 100116A
  72. GRB 100117A: Fermi GBM detection
  73. Swift/UVOT refined analysis of GRB100117A
  74. GRB 100117A: Swift-XRT refined analysis
  75. GRB 100117A: Swift-BAT refined analysis
  76. GRB100117A: Possible afterglow from NOT observation
  77. GRB 100117A: Swift detection of a short hard burst
  78. GRB 100116A: Fermi LAT detection
  79. GRB 100116A: Fermi GBM detection
  80. GRB 100115A: Swift/UVOT Upper Limits
  81. GRB 100115A: Swift-XRT candidate afterglow
  82. GRB 100111A: PAIRITEL NIR Upper Limits
  83. GRB 100111A: Swift UVOT Refined Analysis
  84. GRB 100111A: Swift-BAT refined analysis
  85. GRB100111A: Swift-XRT refined analysis
  86. GRB 100111A: Fermi GBM observation
  87. GRB 100111A: NOT optical observations
  88. GRB 100111A: Swift detection of a burst with an optical afterglow
  89. Swift/BAT Detects an Outburst from XTE J1901+014
  90. Swift Trigger #382159 is due to XTE J1752-223
  91. GRB 100103A: GROND Upper Limits
  92. GRB 100103A: Swift-XRT team refined analysis
  93. Swift Trigger 381591: Retraction of Reported UVOT Source
  94. Swift Trigger 381591 is probably not a burst
  95. Swift Trigger 381591: Uncatalogued UVOT Source
  96. Trigger 381591: Swift detection of a possible burst
  97. GRB 091230: Swift-XRT observation
  98. GRB 091230: GROND optical/NIR afterglow candidate
  99. Swift Trigger 381434 is not a GRB
  100. Trigger 381434: Swift detection of a possible burst

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