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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"

28053 results found.

  1. GRB 100424A: Gemini/NIRI H-band observations
  2. GRB100425A: Swift/UVOT Upper Limits
  3. GRB 100424A: Swift/UVOT Upper Limits
  4. GRB 100424A: Liverpool Telescope Upper Limits
  5. GRB 100425A: Enhanced Swift-XRT position
  6. GRB 100425A: Swift-BAT refined analysis
  7. GRB 100425A: GROND afterglow observation
  8. GRB 100424A: Gemini/NIRI Candidate Afterglow
  9. GRB 100424A: D50 optical limits
  10. GRB 100425A: candidate optical afterglow from the VLT
  11. GRB100424A: MITSuME optical upper limits
  12. GRB100423A: MITSuME optical upper limits
  13. GRB 100424A : Lulin early z'-band upper limit
  14. GRB 100424A: GROND Upper Limits
  15. GRB 100424A: PAIRITEL NIR Upper Limits
  16. GRB 100424A: Swift-XRT refined analysis
  17. GRB 100425A: Swift detection of a burst
  18. GRB 100424A: NOT optical observations
  19. GRB 100424A, Swift-BAT refined analysis
  20. GRB 100424A: Enhanced Swift-XRT position
  21. GRB 100424A: Prompt enhanced Swift-XRT position.
  22. GRB 100424A: Swift detection of a burst
  23. GRB 100420A: GRT Optical Observation
  24. Swift Trigger 420256: D50 optical limits
  25. GRB 100423B: Fermi GBM detection
  26. GRB 100423A: Swift-BAT refined analysis
  27. Swift Trigger 420256: IAC80 R-band observations
  28. Swift Trigger 420256: BOOTES-2 observations
  29. Trigger 420256: Swift detection of a possible GRB
  30. GRB 100423A: GROND discovery of afterglow
  31. GRB 100418A: Continued PAIRITEL NIR Observations
  32. GRB100418A: REM possible afterglow detection
  33. GRB 100418A: Continuing Swift/UVOT Observations
  34. GRB100420A: MITSuME optical upper limits
  35. GRB 100414A: CFHT optical observations
  36. GRB 100420A: Swift/UVOT Upper Limits
  37. GRB 100420A: XRT refined analysis
  38. GRB 100420A: Enhanced Swift-XRT position
  39. GRB 100418A: SARA second epoch
  40. GRB 100420A: SARA Upper Limits
  41. GRB 100418A: optical observations
  42. GRB 100414A: Confirmation of the X-ray afterglow
  43. GRB 100418A: SMA submm detection
  44. GRB 100420A: Swift detection of a burst
  45. GRB 100418A PAIRITEL NIR Observations
  46. GRB 100418A: Swift/UVOT Observations
  47. GRB 100418A: Gemini-N redshift confirmation
  48. GRB 100418A: Swift-XRT Refined Analysis
  49. GRB100418A: VLT/X-shooter redshift and photometry
  50. GRB 100418A: SARA observations
  51. GRB 100418A: GROND observations; missing author list added
  52. GRB 100418A: GROND observations
  53. GRB 100418A: Swift-BAT refined analysis
  54. GRB 100418A: Enhanced Swift-XRT position
  55. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  56. GRB 100413A: Radio Afterglow Detection with the EVLA
  57. GRB 100414A: Suzaku WAM observation of the prompt emission
  58. GRB 100414A: Swift/UVOT Observations
  59. GRB 100414A: GROND Detection of the Optical Afterglow
  60. GRB 100414A: Gemini-N candidate and redshift
  61. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  62. GRB 100413A: Suzaku WAM observation of the prompt emission
  63. GRB 100414A: Palomar Transient Factory Observations
  64. GRB 100413B: Swift Confirmation of Burst
  65. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  66. GRB 100413A: Swift-BAT final refined analysis
  67. GRB 100414A: Fermi GBM detection
  68. GRB100414A: Fermi LAT detection
  69. GRB 100413A: GROND Upper limits
  70. GRB 100413A: Swift/UVOT Upper Limits
  71. Konus-Wind observation of GRB 100413A
  72. GRB 100413A: Faulkes Telescope South observations
  73. GRB 100413A: SARA upper limit
  74. GRB 100413A: Swift-XRT Refined Analysis
  75. GRB 100413A: Swift-BAT initial refined analysis
  76. GRB 100413A: Enhanced Swift-XRT position
  77. GRB 100413A: Swift detection of a burst
  78. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  79. Trigger 419015 is probably not a GRB
  80. GRB100401A: GROND Upper Limits
  81. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  82. GRB 100331B: GROND Upper limits
  83. GRB 100401A: Fermi GBM detection
  84. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  85. GRB 100331B: BOOTES-3 observations
  86. GRB 100324B: Suzaku WAM observation of the prompt emission
  87. GRB 100331B: Swift/UVOT Upper Limits
  88. GRB 100331B: Swift/XRT possible afterglow candidate
  89. Swift detection of LS V +44 17
  90. GRB 100331B: SuperAGILE Localization of a Long GRB
  91. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  92. GRB 100331A: BOOTES-3 observations
  93. GRB 100331A: A long GRB detected by INTEGRAL
  94. GRB 100322A: Suzaku WAM observation of the prompt emission
  95. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  96. GRB 100325A: Fermi LAT detection
  97. GROND observations of GRB100316D/SN2010bh
  98. GRB 100325A: Fermi GBM detection
  99. GRB 100324A: GROND observations
  100. GRB 100324A found in ground analysis of BAT data

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