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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"

19548 results found.

  1. GRB 060930: near-IR afterglow candidate retraction
  2. GRB 061006: Swift detection of a burst
  3. GRB 061004: Optical afterglow candidate and redshift
  4. GRB 061004, Swift BAT refined analysis
  5. GRB 061004: Swift detection of a burst
  6. Konus-Wind observation of GRB 060928
  7. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  8. GRB 060928: Swift observations
  9. IPN triangulation of GRB060928 (long, exceptionally bright)
  10. GRB 060930: near-IR afterglow candidate
  11. VLA observations of GRB 060926
  12. GRB061002 - SDSS Pre-Burst Observations
  13. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  14. GRB 061002: Swift detection of a burst
  15. GRB 060908: Detection of a possible host
  16. GRB 060807: Detection of a possible host galaxy
  17. GRB 060923A: VLA K-band Observations
  18. GRB 060930: Xinglong TNT optical observations
  19. GRB 060929: Swift/UVOT Optical Observations
  20. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  21. GRB 060929: TNG K-band observations
  22. GRB060929: Optical limit
  23. Liverpool Telescope observations of GRB 060929
  24. GRB060908: optical observations
  25. GRB 060927: Swift/UVOT Optical Observations
  26. GRB 060927: Swift XRT Team refined analysis
  27. GRB 060927 optical limit
  28. GRB 060927: Xinglong TNT optical observations
  29. GRB 060927, optical observation
  30. GRB060927 - SDSS Pre-Burst Observations
  31. GRB060926: VLT redshift
  32. GRB 060926: Swift-UVOT Detections
  33. GRB 060923A: Radio Observations
  34. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  35. GRB 060923C: VLA Observation
  36. GRB 060923C: NIR afterglow confirmed
  37. GRB060923C: AROMA optical obsevation
  38. GRB 060923C, optical observation
  39. GRB 060923C: VLT J-band observations
  40. GRB 060923A: Keck and Gemini Observations
  41. GRB 060923C: Xinglong TNT optical observations
  42. GRB 060923C: Swift detection of a burst
  43. GRB 060923B: Swift detection of a burst
  44. GRB 060923: UKIRT nIR observations - candidate afterglow
  45. GRB060923 - SDSS Pre-Burst Observations
  46. GRB 060923: Swift detection of a burst
  47. GRB 060919 : Faulkes South Telescope Observations
  48. GRB 060919: TAROT optical observations
  49. GRB 060919: Swift detection of a burst
  50. GRB 060912A: VLA Observation
  51. GRB 060912A: Probable Host Galaxy
  52. Konus-Wind observation of GRB 060912
  53. GRB 060912: Correction to GCN 5559
  54. GRB060906: Danish/DFOSC optical observations
  55. VLA observations of GRB 060908
  56. GRB 060908 - SDSS Pre-burst Observations
  57. GRB 060908: REM optical prompt observation
  58. GRB 060908: Swift detection of a burst with a bright optical counterpart
  59. GRB060906 , optical observation
  60. GRB 060906: Early RAPTOR optical limits
  61. GRB 060906, Swift-BAT refined spectral analysis
  62. GRB 060906: Confirmation of P60 Optical Afterglow
  63. GRB 060906 (?): P60 Optical Afterglow Candidate
  64. GRB 060906: Swift detection of a probable burst
  65. GRB060904b, optical observations
  66. GRB 060904B: RTT150 optical observations
  67. GRB060904A: Swift/UVOT optical observations
  68. GRB 060904A: Subaru NIR observation
  69. GRB 060904A: Refined analysis of the Swift-BAT burst
  70. GRB 060904A: Suzaku-XIS and -HXD observation plan
  71. GRB 060904A: P60 Observations
  72. GRB 060904B: TAROT optical counterpart observations
  73. GRB060904B - SDSS Pre-Burst Observations
  74. GRB 060904: TAROT optical observations
  75. GRB 060904B: Swift detection of a burst with optical counterpart
  76. GRB060904 - SDSS Pre-Burst Observations
  77. GRB 060904: Swift detection of a bright burst
  78. GRB060901: Optical observations
  79. 060901: Swift UVOT followup observations
  80. Konus-Wind observation of GRB 060901
  81. GRB 060605, observations using an Integral Field Unit
  82. GRB 060604: VLA Observation
  83. GRB 060605: VLA Observation
  84. GRB 060707: VLA observation
  85. GRB 060825: VLA observations
  86. GRB060826 - SDSS Pre-Burst Observations
  87. GRB 060826(?): Swift detection of a possible burst
  88. GRB 060825: TNG optical observations
  89. GRB 060825: TAROT optical observations
  90. GRB 060825: P60 Observations
  91. GRB 060825: Swift detection of a burst
  92. GRB060801: host galaxy redshift
  93. GRB 060729, SMARTS optical/IR observations
  94. GRB 060814: P60 Observations
  95. GRB 060814: P200 NIR Observations
  96. GRB 060814: VLT optical limits
  97. GRB 060814 - SDSS Pre-Burst Observations
  98. GRB 060814: TAROT optical observations
  99. GRB 060814: Swift detection of a bright burst
  100. GRB 060813: Swift detection of a burst

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