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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"

21263 results found.

  1. Konus-Wind observation of GRB 061007
  2. GRB061007: Swift UVOT followup observations
  3. GRB 061006: optical afterglow
  4. GRB 061006 : Suzaku/WAM observation of the prompt emission
  5. GRB 061007: OA fading and VLT redshift
  6. GRB 061007: Swift-BAT refined analysis
  7. GRB 061007: Swift XRT refined analysis
  8. GRB 061006: Swift/UVOT optical observations
  9. Konus-Wind observation of the short hard GRB 061006
  10. GRB 061007: Swift detection of a burst with an optical counterpart
  11. GRB 061006: VLT observation
  12. GRB 060930: near-IR afterglow candidate retraction
  13. GRB 061006: Swift detection of a burst
  14. GRB 061004: Optical afterglow candidate and redshift
  15. GRB 061004: Swift detection of a burst
  16. Konus-Wind observation of GRB 060928
  17. GRB 060928: Suzaku/WAM observation of the prompt emission
  18. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  19. GRB 060928: Swift observations
  20. GRB 060928: RHESSI Spectral Fit
  21. IPN triangulation of GRB060928 (long, exceptionally bright)
  22. GRB 060930: near-IR afterglow candidate
  23. VLA observations of GRB 060926
  24. GRB061002 - SDSS Pre-Burst Observations
  25. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  26. GRB 061002: Swift detection of a burst
  27. GRB 060908: Detection of a possible host
  28. GRB 060923A: Probable host galaxy in the R-band
  29. GRB 060807: Detection of a possible host galaxy
  30. GRB 060923A: VLA K-band Observations
  31. GRB 060930: Xinglong TNT optical observations
  32. GRB 060929: Swift/UVOT Optical Observations
  33. GRB 060930: ROTSE-III Optical Limits
  34. GRB 060929: TNG K-band observations
  35. GRB 060929, Swift-BAT refined analysis
  36. GRB060929: Optical limit
  37. Liverpool Telescope observations of GRB 060929
  38. GRB060908: optical observations
  39. GRB 060927: Swift/UVOT Optical Observations
  40. GRB 060927 optical limit
  41. GRB 060927: Xinglong TNT optical observations
  42. GRB 060927, optical observation
  43. GRB 060926: MASTER: first minutes decay
  44. GRB060927 - SDSS Pre-Burst Observations
  45. GRB 060927: Swift detection of a burst
  46. GRB 060926: Swift-UVOT Detections
  47. GRB 060923A: Radio Observations
  48. GRB 060926: MASTER OT alert observation
  49. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  50. GRB 060923C: VLA Observation
  51. GRB 060923C: NIR afterglow confirmed
  52. GRB060923C: AROMA optical obsevation
  53. GRB 060923C, optical observation
  54. GRB 060923C: VLT J-band observations
  55. GRB 060923A: Keck and Gemini Observations
  56. GRB 060923C: Xinglong TNT optical observations
  57. GRB 060923C: Swift detection of a burst
  58. GRB 060923B: Swift detection of a burst
  59. GRB 060923, Swift-BAT refined analysis
  60. GRB 060923: Early Super-LOTIS Observations
  61. GRB 060923: UKIRT nIR observations - candidate afterglow
  62. GRB060923 - SDSS Pre-Burst Observations
  63. GRB 060923: Swift detection of a burst
  64. GRB 060919 : Faulkes South Telescope Observations
  65. GRB 060919, Swift-BAT refined analysis
  66. GRB 060919: TAROT optical observations
  67. GRB 060912A: VLA Observation
  68. GRB 060912A: Probable Host Galaxy
  69. GRB060912: OPTIMA-Burst optical observations
  70. GRB 060912: Correction to GCN 5559
  71. GRB060906: Danish/DFOSC optical observations
  72. VLA observations of GRB 060908
  73. GRB 060908 - SDSS Pre-burst Observations
  74. GRB 060908: REM optical prompt observation
  75. GRB 060908: Swift detection of a burst with a bright optical counterpart
  76. GRB 060904A: Suzaku/WAM observation of the prompt emission
  77. GRB060906 , optical observation
  78. GRB 060906: Early RAPTOR optical limits
  79. GRB 060906, Swift-BAT refined spectral analysis
  80. GRB 060906: Confirmation of P60 Optical Afterglow
  81. GRB 060906 (?): P60 Optical Afterglow Candidate
  82. GRB 060906: Swift detection of a probable burst
  83. GRB 060904A Milagro GeV/TeV Observations
  84. GRB060904b, optical observations
  85. GRB060904A: Swift/UVOT optical observations
  86. GRB 060904A: Subaru NIR observation
  87. GRB 060904B: Swift-BAT refined analysis
  88. Konus-Wind observation of GRB 060904A
  89. GRB 060904A: Refined analysis of the Swift-BAT burst
  90. GRB 060904A: Suzaku-XIS and -HXD observation plan
  91. GRB 060904A: P60 Observations
  92. GRB 060904B: TAROT optical counterpart observations
  93. GRB060904B - SDSS Pre-Burst Observations
  94. GRB 060904: TAROT optical observations
  95. GRB 060904B: Swift detection of a burst with optical counterpart
  96. GRB060904 - SDSS Pre-Burst Observations
  97. GRB 060904: Swift detection of a bright burst
  98. GRB060901: Optical observations
  99. 060901: Swift UVOT followup observations
  100. Konus-Wind observation of GRB 060901

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