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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"

603 results found.

  1. Konus-Wind observation of GRB 120119A
  2. GRB 120119A: Swift detection of a burst with an optical counterpart
  3. XRF 120118A: Optical candidate
  4. AXP 4U 1042+61: Mondy optical observations
  5. GRB 120116A: Swift-BAT refined analysis
  6. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  7. Swift detection of an SGR burst from AXP 4U 0142+61
  8. GRB 111222A : Suzaku WAM observation of the prompt emission
  9. GRB 111215B: Suzaku WAM observation of the prompt emission
  10. GRB 111210A: Swift-BAT refined analysis
  11. GRB 111129A: Swift-BAT refined analysis
  12. GRB 111029A: Faulkes Telescope North observations
  13. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  14. GRB 110827A, Swift-BAT refined analysis
  15. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  16. GRB 110818A: Swift-XRT refined Analysis
  17. GRB110731A: MOA optical observations of the steeply fading afterglow
  18. AXP 4U 0142+61: Fermi GBM detection
  19. GRB110731A: Swift/UVOT Observations
  20. AXP 4U 0142+61: Swift-BAT refined analysis
  21. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  22. GRB 110709B: Preliminary Swift-BAT refined analysis
  23. GRB 110530A: optical observations in Mondy observatory
  24. GRB 110530A: optical observations at Mt. Terskol, second epoch
  25. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  26. GRB 110530A: optical observations at Mt. Terskol
  27. GRB 110530A: Swift-BAT refined analysis
  28. GRB 110530A: Swift detection of a burst with an optical afterglow
  29. GRB 110521A: Swift-XRT refined analysis
  30. GRB 110422A: Swift-BAT refined analysis
  31. GRB 110420B: Swift-BAT refined analysis
  32. GRB 110420A: Swift-BAT refined analysis
  33. GRB 110411A, Swift-BAT refined analysis
  34. GRB 110402A: fading optical afterglow
  35. GRB 110402A: optical observations in Mondy
  36. GRB 110402A: Liverpool Telescope Observations
  37. GRB 110305A: Swift-BAT refined analysis
  38. IBAS trigger n. 6138 is not a GRB
  39. Konus-Wind observation of GRB 110213A
  40. GRB 110106B: Swift-BAT refined analysis
  41. GRB 110106A: Swift-BAT refined analysis
  42. GRB 100906A: Swift-BAT refined analysis
  43. GRB 100905A: Swift-BAT refined analysis
  44. GRB 100904A: Swift-BAT refined analysis
  45. Konus-Wind observation of GRB 100829A
  46. GRB 100902A: MASTER Prompt Optical Observations
  47. GRB 100902A: MASTER Optical Early Limit
  48. Konus-Wind observation of GRB 100816A
  49. GRB 100807A: Swift-BAT refined analysis
  50. GRB 100718A: MASTER-Net optical prompt and alert observations
  51. GRB 100719A: Swift-BAT refined analysis
  52. GRB 100702A, Swift-BAT refined analysis
  53. GRB 100625A: Swift-XRT Team refined analysis
  54. GRB 100615A: Swift-BAT refined analysis
  55. Konus-Wind observation of GRB 100528A
  56. GRB 100526A: Swift detection of a burst
  57. Swift-BAT trigger 421695 is likely not astrophysical
  58. GRB 100425A: Swift-BAT refined analysis
  59. GRB 100423A: Swift-BAT refined analysis
  60. GRB 100418A: Swift-BAT refined analysis
  61. GRB 100316B: Swift-BAT refined analysis
  62. GRB 100213A: Swift-BAT refined analysis
  63. GRB 100213B: Swift-BAT refined analysis
  64. GRB 100212A: Swift-BAT refined analysis
  65. Konus-Wind observation of GRB 091208A
  66. GRB 091208A: Swift-XRT observations
  67. GRB 091208A Swift-BAT refined analysis
  68. Konus-Wind observation of GRB 091120
  69. GRB 091020, Swift-BAT refined analysis
  70. Konus-Wind observation of GRB 091003A
  71. GRB 090926B: Swift-BAT refined analysis
  72. GRB 090912: optical observation
  73. GRB 090831C BAT refined analysis
  74. Konus-Wind observations of GRB 090831A
  75. Konus-Wind observations of GRB 090823
  76. GRB 090814C: Fermi GBM detection
  77. Konus-Wind observations of GRB090813
  78. Swift-BAT trigger 358760 is most likely not a GRB
  79. GRB 090709A: Swift XRT Timing Analysis
  80. Konus-Wind and Konus-RF observations of GRB 090715B
  81. GRB 090709B, Swift-BAT refined analysis
  82. GRB 090621A: Enhanced Swift-XRT position
  83. GRB 090620: Fermi GBM detecion
  84. GRB 090621: Swift-XRT Team refined analysis
  85. GRB 090608: Fermi GBM detection
  86. GRB 090531B: Swift-BAT refined analysis
  87. GRB 090516 - Zadko Telescope observations
  88. GRB 090509 - Zadko Telescope observations
  89. AGILE detection of GRB 090510
  90. GRB 090429A: Swift-BAT refined analysis
  91. GRB 090419: Swift/UVOT Observations
  92. Konus-Wind and Konus-RF observations of GRB 090408b
  93. GRB 090313: Zadko Telescope observations
  94. GRB 090309, Swift-BAT refined analysis
  95. GRB 090305, Swift-BAT refined analysis
  96. GRB 090301A: Swift-BAT refined analysis
  97. GRB 090113: Swift detection of a burst
  98. Swift triggered on the HMXB 1A 1118-61
  99. GRB 081221, Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 081203B

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