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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"

32484 results found.

  1. GRB 061007: ATCA Radio Observations
  2. GRB061007: Swift UVOT followup observations
  3. GRB 061006: optical afterglow
  4. GRB 061007: OA fading and VLT redshift
  5. GRB 061007: Magellan Spectroscopy
  6. GRB 061007: Correction to GCN 5712
  7. GRB 061007: Swift-BAT refined analysis
  8. GRB 061007: Swift XRT refined analysis
  9. GRB 061006: Swift/UVOT optical observations
  10. Konus-Wind observation of the short hard GRB 061006
  11. GRB 061007 - FTS early brightening and power law decay
  12. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  13. GRB 061007: ROTSE-III Detection of Optical Counterpart
  14. GRB 061006: VLT observation
  15. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  16. GRB 061006: Swift-XRT Team Refined Analysis
  17. GRB061006 (Swift 232585) might be a short-hard GRB
  18. GRB061006: Faulkes Telescope South Observations
  19. GRB 061004: Optical afterglow candidate and redshift
  20. GRB 061004: Las Campanas Optical/NIR Observations
  21. GRB061004: Swift/UVOT optical observations
  22. GRB 061004: Swift-XRT Team Refined Analysis
  23. GRB 061004, Swift BAT refined analysis
  24. GRB 061004: Nearby 2MASS Galaxy
  25. GRB 060928: Correction to GCN 5690
  26. Konus-Wind observation of GRB 060928
  27. GRB 060928: Suzaku/WAM observation of the prompt emission
  28. GRB 060928: Swift observations
  29. GRB 060928: RHESSI Spectral Fit
  30. IPN triangulation of GRB060928 (long, exceptionally bright)
  31. GRB061002: Swift UVOT followup observations
  32. GRB 060930: near-IR afterglow candidate
  33. GRB 061002: Swift-XRT Team Refined Analysis
  34. VLA observations of GRB 060926
  35. GRB 061002, Swift-BAT refined analysis
  36. GRB 060908: Detection of a possible host
  37. GRB 060923A: Probable host galaxy in the R-band
  38. GRB 060807: Detection of a possible host galaxy
  39. GRB 060923A: VLA K-band Observations
  40. GRB060930: Faulkes Telescope South observation
  41. GRB 060929: Further XRT Refined Analysis
  42. GRB 060929: Swift/UVOT Optical Observations
  43. GRB 060930: ROTSE-III Optical Limits
  44. GRB 060927 : GAO 150cm telescope optical observation
  45. GRB060929: Swift-XRT refined analysis.
  46. GRB 060929, Swift-BAT further refined analysis - late-time flare
  47. GRB 060929: TNG K-band observations
  48. GRB 060929, Swift-BAT refined analysis
  49. GRB060929: Optical limit
  50. GRB 060929: BART observation
  51. GRB 060929: BOOTES-IR & OSN observations
  52. GRB060908: optical observations
  53. GRB 060729: An update on the late-time Swift observations
  54. GRB060923C: optical limit
  55. GRB060927: optical observations
  56. test of new software, grb
  57. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  58. GRB 060927: Swift/UVOT Optical Observations
  59. GRB 060927: Early color
  60. GRB 060927: Swift XRT Team refined analysis
  61. GRB 060927 optical limit
  62. GRB 060927, Swift-BAT refined analysis
  63. GRB060926: improved redshift
  64. GRB 060927, optical observation
  65. GRB 060927: Possible host galaxy (star?) in the SDSS
  66. GRB060927: Faulkes Telescope South observation
  67. GRB 060926: MASTER: first minutes decay
  68. GRB 060927: optical afterglow confirmation
  69. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  70. GRB060926: VLT redshift
  71. GRB 060926: Swift-UVOT Detections
  72. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  73. GRB 060926: OPTIMA-Burst -- further observations
  74. GRB 060926: Swift XRT refined analysis
  75. GRB 060926, Swift-BAT refined analysis
  76. GRB 060923A: Radio Observations
  77. GRB 060926: MASTER OT alert observation
  78. GRB 060912A: Redshift of probable host galaxy
  79. GRB 060926: BOOTES-IR observations
  80. GRB060926 OPTIMA-Burst optical observation
  81. GRB 060926: MASTER optical observation
  82. GRB 060923C, Swift-BAT refined analysis
  83. GRB 060923C: VLA Observation
  84. GRB 060923C: NIR afterglow confirmed
  85. GRB060923C: AROMA optical obsevation
  86. GRB 060923C: Gemini Observations and Afterglow Candidate
  87. GRB 060923C, optical observation
  88. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  89. GRB 060923C: VLT J-band observations
  90. GRB060923B: Swift/UVOT upper limits
  91. GRB 060923B: Swift XRT Refined Analysis
  92. GRB 060923C: Swift XRT refined analysis
  93. GRB 060923C, Swift-BAT partial refined analysis
  94. GRB 060923A: Swift XRT refined analysis
  95. GRB 060923C: Keck Observations
  96. GRB 060923A: Keck and Gemini Observations
  97. GRB 060923B, Swift-BAT refined analysis
  98. GRB060923C : Faulkes Telescope South optical limits
  99. GRB060923C: Faulkes Telescope North optical observations
  100. GRB 060923C: optical observation

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