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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"

21787 results found.

  1. GRB 061028: SARA upper limit
  2. GRB 061028: z band imaging
  3. GRB 061028: Swift/UVOT Observations
  4. GRB 061028, Swift-BAT refined analysis
  5. GRB 061028: TAROT Calern observatory optical observations
  6. GRB 061028: Swift detection of a burst
  7. GRB 061027, Swift refined analysis of a possible burst
  8. GRB 061027: Swift detection of a possible burst
  9. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  10. GRB061025: Swift/UVOT observations
  11. GRB 061025: REM observations
  12. GRB 061025: ROTSE-III Optical Limits
  13. Konus-Wind observation of GRB 061021
  14. GRB 061021: Swift-XRT refined analysis
  15. GRB 061021: Swift/UVOT Observation
  16. GRB 061021: Swift detection of a burst
  17. GRB060904b: optical observations
  18. GRB 061019: SARA upper limit
  19. GRB 061019: Swift/UVOT upper limit
  20. GRB 061019, Swift-BAT refined analysis
  21. GRB 061019: TAROT La Silla observatory optical observations
  22. GRB 061019: REM K-band candidate afterglow
  23. GRB 061007: Suzaku/WAM observation of the prompt emission
  24. GRB 061006: astrometry-corrected XRT position
  25. Konus-Wind observation of GRB 061007
  26. GRB061007: Swift UVOT followup observations
  27. GRB 061006: optical afterglow
  28. GRB 061006 : Suzaku/WAM observation of the prompt emission
  29. GRB 061007: OA fading and VLT redshift
  30. GRB 061007: Swift-BAT refined analysis
  31. GRB 061007: Swift XRT refined analysis
  32. GRB 061006: Swift/UVOT optical observations
  33. Konus-Wind observation of the short hard GRB 061006
  34. GRB 061007: Swift detection of a burst with an optical counterpart
  35. GRB 061006: VLT observation
  36. GRB 060930: near-IR afterglow candidate retraction
  37. GRB 061006: Swift detection of a burst
  38. GRB 061004: Optical afterglow candidate and redshift
  39. GRB 061004: Swift detection of a burst
  40. Konus-Wind observation of GRB 060928
  41. GRB 060928: Suzaku/WAM observation of the prompt emission
  42. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  43. GRB 060928: Swift observations
  44. GRB 060928: RHESSI Spectral Fit
  45. IPN triangulation of GRB060928 (long, exceptionally bright)
  46. GRB 060930: near-IR afterglow candidate
  47. VLA observations of GRB 060926
  48. GRB061002 - SDSS Pre-Burst Observations
  49. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  50. GRB 061002: Swift detection of a burst
  51. GRB 060908: Detection of a possible host
  52. GRB 060923A: Probable host galaxy in the R-band
  53. GRB 060807: Detection of a possible host galaxy
  54. GRB 060923A: VLA K-band Observations
  55. GRB 060930: Xinglong TNT optical observations
  56. GRB 060929: Swift/UVOT Optical Observations
  57. GRB 060930: ROTSE-III Optical Limits
  58. GRB 060929: TNG K-band observations
  59. GRB 060929, Swift-BAT refined analysis
  60. GRB060929: Optical limit
  61. Liverpool Telescope observations of GRB 060929
  62. GRB060908: optical observations
  63. GRB 060927: Swift/UVOT Optical Observations
  64. GRB 060927 optical limit
  65. GRB 060927: Xinglong TNT optical observations
  66. GRB 060927, optical observation
  67. GRB 060926: MASTER: first minutes decay
  68. GRB060927 - SDSS Pre-Burst Observations
  69. GRB 060927: Swift detection of a burst
  70. GRB 060926: Swift-UVOT Detections
  71. GRB 060923A: Radio Observations
  72. GRB 060926: MASTER OT alert observation
  73. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  74. GRB 060923C: VLA Observation
  75. GRB 060923C: NIR afterglow confirmed
  76. GRB060923C: AROMA optical obsevation
  77. GRB 060923C, optical observation
  78. GRB 060923C: VLT J-band observations
  79. GRB 060923A: Keck and Gemini Observations
  80. GRB 060923C: Xinglong TNT optical observations
  81. GRB 060923C: Swift detection of a burst
  82. GRB 060923B: Swift detection of a burst
  83. GRB 060923, Swift-BAT refined analysis
  84. GRB 060923: Early Super-LOTIS Observations
  85. GRB 060923: UKIRT nIR observations - candidate afterglow
  86. GRB060923 - SDSS Pre-Burst Observations
  87. GRB 060923: Swift detection of a burst
  88. GRB 060919 : Faulkes South Telescope Observations
  89. GRB 060919, Swift-BAT refined analysis
  90. GRB 060919: TAROT optical observations
  91. GRB 060912A: VLA Observation
  92. GRB 060912A: Probable Host Galaxy
  93. GRB060912: OPTIMA-Burst optical observations
  94. GRB 060912: Correction to GCN 5559
  95. GRB060906: Danish/DFOSC optical observations
  96. VLA observations of GRB 060908
  97. GRB 060908 - SDSS Pre-burst Observations
  98. GRB 060908: REM optical prompt observation
  99. GRB 060908: Swift detection of a burst with a bright optical counterpart
  100. GRB 060904A: Suzaku/WAM observation of the prompt emission

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