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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"

20453 results found.

  1. GRB 061006: VLT observation
  2. GRB 060930: near-IR afterglow candidate retraction
  3. GRB 061006: Swift detection of a burst
  4. GRB 061004: Optical afterglow candidate and redshift
  5. GRB 061004: Swift detection of a burst
  6. Konus-Wind observation of GRB 060928
  7. GRB 060928: Suzaku/WAM observation of the prompt emission
  8. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  9. GRB 060928: Swift observations
  10. GRB 060928: RHESSI Spectral Fit
  11. IPN triangulation of GRB060928 (long, exceptionally bright)
  12. GRB 060930: near-IR afterglow candidate
  13. VLA observations of GRB 060926
  14. GRB061002 - SDSS Pre-Burst Observations
  15. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  16. GRB 061002: Swift detection of a burst
  17. GRB 060908: Detection of a possible host
  18. GRB 060923A: Probable host galaxy in the R-band
  19. GRB 060807: Detection of a possible host galaxy
  20. GRB 060923A: VLA K-band Observations
  21. GRB 060930: Xinglong TNT optical observations
  22. GRB 060929: Swift/UVOT Optical Observations
  23. GRB 060930: ROTSE-III Optical Limits
  24. GRB 060929: TNG K-band observations
  25. GRB 060929, Swift-BAT refined analysis
  26. GRB060929: Optical limit
  27. Liverpool Telescope observations of GRB 060929
  28. GRB060908: optical observations
  29. GRB 060927: Swift/UVOT Optical Observations
  30. GRB 060927 optical limit
  31. GRB 060927: Xinglong TNT optical observations
  32. GRB 060927, optical observation
  33. GRB 060926: MASTER: first minutes decay
  34. GRB060927 - SDSS Pre-Burst Observations
  35. GRB 060927: Swift detection of a burst
  36. GRB 060926: Swift-UVOT Detections
  37. GRB 060923A: Radio Observations
  38. GRB 060926: MASTER OT alert observation
  39. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  40. GRB 060923C: VLA Observation
  41. GRB 060923C: NIR afterglow confirmed
  42. GRB060923C: AROMA optical obsevation
  43. GRB 060923C, optical observation
  44. GRB 060923C: VLT J-band observations
  45. GRB 060923A: Keck and Gemini Observations
  46. GRB 060923C: Xinglong TNT optical observations
  47. GRB 060923C: Swift detection of a burst
  48. GRB 060923B: Swift detection of a burst
  49. GRB 060923, Swift-BAT refined analysis
  50. GRB 060923: Early Super-LOTIS Observations
  51. GRB 060923: UKIRT nIR observations - candidate afterglow
  52. GRB060923 - SDSS Pre-Burst Observations
  53. GRB 060923: Swift detection of a burst
  54. GRB 060919 : Faulkes South Telescope Observations
  55. GRB 060919, Swift-BAT refined analysis
  56. GRB 060919: TAROT optical observations
  57. GRB 060912A: VLA Observation
  58. GRB 060912A: Probable Host Galaxy
  59. GRB060912: OPTIMA-Burst optical observations
  60. GRB 060912: Correction to GCN 5559
  61. GRB060906: Danish/DFOSC optical observations
  62. VLA observations of GRB 060908
  63. GRB 060908 - SDSS Pre-burst Observations
  64. GRB 060908: REM optical prompt observation
  65. GRB 060908: Swift detection of a burst with a bright optical counterpart
  66. GRB 060904A: Suzaku/WAM observation of the prompt emission
  67. GRB060906 , optical observation
  68. GRB 060906: Early RAPTOR optical limits
  69. GRB 060906, Swift-BAT refined spectral analysis
  70. GRB 060906: Confirmation of P60 Optical Afterglow
  71. GRB 060906 (?): P60 Optical Afterglow Candidate
  72. GRB 060906: Swift detection of a probable burst
  73. GRB 060904A Milagro GeV/TeV Observations
  74. GRB060904b, optical observations
  75. GRB060904A: Swift/UVOT optical observations
  76. GRB 060904A: Subaru NIR observation
  77. GRB 060904B: Swift-BAT refined analysis
  78. Konus-Wind observation of GRB 060904A
  79. GRB 060904A: Refined analysis of the Swift-BAT burst
  80. GRB 060904A: Suzaku-XIS and -HXD observation plan
  81. GRB 060904A: P60 Observations
  82. GRB 060904B: TAROT optical counterpart observations
  83. GRB060904B - SDSS Pre-Burst Observations
  84. GRB 060904: TAROT optical observations
  85. GRB 060904B: Swift detection of a burst with optical counterpart
  86. GRB060904 - SDSS Pre-Burst Observations
  87. GRB 060904: Swift detection of a bright burst
  88. GRB060901: Optical observations
  89. 060901: Swift UVOT followup observations
  90. Konus-Wind observation of GRB 060901
  91. GRB 060605, observations using an Integral Field Unit
  92. GRB 060604: VLA Observation
  93. GRB 060814: Suzaku/WAM observation of the prompt emission
  94. GRB 060605: VLA Observation
  95. GRB 060707: VLA observation
  96. GRB 060825: VLA observations
  97. GRB060826 - SDSS Pre-Burst Observations
  98. GRB 060826(?): Swift detection of a possible burst
  99. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  100. GRB 060825: TNG optical observations

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