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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"

8474 results found.

  1. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  2. GRB 130515A: Fermi GBM detection
  3. GRB 130515A: Swift detection of a short burst
  4. GRB 130514A: Swift detection of a burst
  5. GRB 130511A, Swift-BAT refined analysis
  6. GRB 130511A: Swift detection of a burst with an optical counterpart
  7. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  8. GRB 130508A: Swift detection of a probable burst
  9. GRB 130427A, LBT optical spectrum
  10. GRB 130505B: Swift Candidate Afterglow
  11. GRB 130504A: IAC80 optical candidate
  12. GRB 130505A: Swift detection of a burst with optical afterglow
  13. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  14. GRB 130504A, Swift-BAT refined analysis
  15. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  16. Trigger 555096: Swift detection of a possible burst
  17. GRB 130502A: Fermi GBM detection
  18. GRB 130502A: Swift/UVOT Upper Limits
  19. GRB 130502B: P60 Observations
  20. GRB 130502A: TNG candidate counterpart
  21. GRB 130502A: Swift detection of a burst
  22. Konus-Wind observation of GRB 130427A
  23. GRB 130427A: Fermi GBM observation
  24. GRB 130427B: Swift detection of a burst with optical counterpart
  25. GRB 130418A: WSRT radio observation
  26. Swift Trigger 554135 is probably not a GRB or transient
  27. GRB 130420B: Swift detection of a burst
  28. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  29. GRB 130420A: Swift detection of a burst with an optical counterpart
  30. GRB 130420A: Faulkes Telescope North candidate
  31. GRB 130418A: Bassano Bresciano Observatory optical observations
  32. GRB 130418A: Swift detection of a burst with an optical counterpart
  33. GRB 130408A, Swift-BAT refined analysis
  34. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  35. GRB 130408A: Liverpool Telescope Optical candidate detection
  36. GRB 130407A Tiled Swift observations
  37. GRB 130211A: Retraction of afterglow candidate
  38. GRB 130310A: RATIR Observations
  39. Swift Trigger 552142: a possible GRB
  40. GRB 130325A Tiled Swift observations
  41. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  42. GRB 130327A: Swift detection of a burst
  43. GRB 130315A: GROND afterglow candidate
  44. GRB130313A: GTC early optical limits
  45. GRB 130315A: Swift detection of a burst
  46. GRB130313A: Optical observations from GTC
  47. GRB 130313A: Swift detection of a short burst
  48. Swift XRT RETRACTION of GRB 130310A afterglow detection
  49. Konus-Wind observation of GRB 130310A
  50. GRB 130310A: Fermi-LAT detection and localization
  51. GRB 130305A: Fermi LAT Detection
  52. GRB 130216A: possible radio counterpart is steady field source
  53. GRB 130216A: Further Swift-BAT refined analysis
  54. GRB 130215A: Fermi GBM detection
  55. GRB 130215A: Redshift estimate
  56. GRB 130215: ROTSE-III Detection of Optical Counterpart
  57. GRB 130211A: Swift detection of a burst
  58. GRB 130206A: Fermi LAT Observations
  59. GRB 130131A: RATIR optical and infrared upper limits
  60. GRB 130131B: Swift detection of a burst
  61. GRB 130131A - UKIRT afterglow candidate
  62. GRB 130131A: Swift detection of a burst
  63. GRB 130122A: Swift-BAT refined analysis
  64. GRB 130122A: T100 observations
  65. GRB 130122A: Swift detection of a burst with an optical counterpart
  66. GRB 130102A: Swift detection of a burst
  67. GRB 121229A: Swift detection of a burst
  68. GRB 121226A: Swift detection of a burst
  69. GRB 121225B: Fermi LAT Detection
  70. GRB 121217A: Swift detection of a burst
  71. GRB 121212A: Swift detection of a burst
  72. GRB 121211A - Faulkes Telescope North afterglow confirmation
  73. GRB 121211A: Swift detection of a burst with an optical counterpart
  74. GRB 121209A: Keck observations
  75. GRB 121209A: CARMA 3mm Observations
  76. GRB 121209A: GROND optical afterglow candidate
  77. GRB 121209A: UVOT Observation
  78. GRB 121128A: Optical Observations
  79. GRB 121122A: Suzaku WAM observation of the prompt emission
  80. GRB121202A: Swift/UVOT Observations
  81. GRB 121201A: a GRB with an optical counterpart
  82. GRB 121128A: WSRT radio observation
  83. GRB 121122A: Fermi GBM observation
  84. GRB 121128A: FTN optical afterglow confirmation
  85. GRB 121128A: Swift detection of a burst with an optical counterpart
  86. Konus-Wind observation of GRB 121122A
  87. GRB 121125A: Fermi GBM Observation
  88. GRB 121125A: LOAO Observation
  89. GRB 121125A: Swift detection of a burst with optical counterpart
  90. GRB 121123A: Fermi GBM observation
  91. GRB 121123A: Swift detection of a burst with optical counterpart
  92. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  93. GRB 121108A: Swift detection of a burst
  94. GRB 121102A: Swift detection of a burst
  95. GRB 121031A: Swift-BAT refined analysis
  96. GRB 121027A: Brightening IR counterpart
  97. GRB 121028A: Swift detection of a burst
  98. GRB 121027A: nIR afterglow candidate with AAT
  99. GRB 121027A: Swift detection of a burst
  100. GRB 121024A: optical observations

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