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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"

32546 results found.

  1. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  2. GRB 061110A, Swift-BAT refined analysis
  3. GRB 061110: ROTSE-III Optical Limits
  4. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  5. GRB 061109: optical observation
  6. GRB061028: MAGIC telescope GeV observation
  7. GRB 061007: Third Epoch ATCA Radio Observations
  8. GRB061019: second epoch CrAO observations
  9. GRB 061028: Swift/XRT Astrometry Correction
  10. GRB 061102: Swift/UVOT Magnitude Upper Limits
  11. GRB 061102, XRT refined analysis
  12. GRB 061004: Further VLT/NTT observations
  13. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  14. GRB061102B: Super-LOTIS observations
  15. GRB 061028: Optical R passband observations
  16. GRB 061102, Swift-BAT refined analysis
  17. GRB 061028: VLA Observation
  18. GRB 061004: Swift/XRT Astrometry Correction
  19. GRB 060801: Swift/XRT Astrometry Correction
  20. GRB 061028: Futher P200 Observations
  21. GRB 061028: MDM Observations
  22. GRB 061028: P200 Observations
  23. GRB 061028: SARA upper limit
  24. GRB 061028: z band imaging
  25. GRB061028: XRT refined analysis
  26. GRB 061028: Swift/UVOT Observations
  27. GRB 061028, Swift-BAT refined analysis
  28. GRB 061027, Swift refined analysis of a possible burst
  29. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  30. GRB061025: Swift XRT refined analysis
  31. GRB061025: Swift/UVOT observations
  32. GRB 061019: MITSuME upper limits
  33. GRB 061025: REM observations
  34. GRB 061025: Gemini-S observations
  35. GRB061025: Swift XRT position
  36. GRB 061025: ROTSE-III Optical Limits
  37. Swift XRT boresight update
  38. GRB 061021, Swift-BAT Lag analysis
  39. Konus-Wind observation of GRB 061021
  40. GRB 061021 - VLT spectrum without lines
  41. GRB 061021: Swift-XRT refined analysis
  42. GRB 061021: Swift/UVOT Observation
  43. GRB 061021, Swift-BAT refined analysis
  44. GRB 061019: Super-LOTIS upper limit
  45. GRB060904b: optical observations
  46. GRB061019: optical observations
  47. GRB061019: optical observations
  48. GRB 061019: SARA upper limit
  49. GRB 060930: MARGE Optical Limits
  50. GRB 061019: Swift/UVOT upper limit
  51. GRB 061019: SMARTS afterglow confirmation
  52. GRB061019: Swift XRT refined analysis
  53. GRB 061019, Swift-BAT refined analysis
  54. GRB 061019: REM K-band candidate afterglow
  55. GRB061019: Swift/XRT position
  56. GRB 060825: GORT Observations
  57. GRB 061007: Second Epoch ATCA Radio Observations
  58. GRB 061007: RHESSI Spectral Fit
  59. GRB 061007: Suzaku/WAM observation of the prompt emission
  60. GRB 061006: astrometry-corrected XRT position
  61. Konus-Wind observation of GRB 061007
  62. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  63. GRB 061007: ATCA Radio Observations
  64. GRB061007: Swift UVOT followup observations
  65. GRB 061006: optical afterglow
  66. GRB 061007: OA fading and VLT redshift
  67. GRB 061007: Magellan Spectroscopy
  68. GRB 061007: Correction to GCN 5712
  69. GRB 061007: Swift-BAT refined analysis
  70. GRB 061007: Swift XRT refined analysis
  71. GRB 061006: Swift/UVOT optical observations
  72. Konus-Wind observation of the short hard GRB 061006
  73. GRB 061007 - FTS early brightening and power law decay
  74. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  75. GRB 061007: ROTSE-III Detection of Optical Counterpart
  76. GRB 061006: VLT observation
  77. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  78. GRB 061006: Swift-XRT Team Refined Analysis
  79. GRB061006 (Swift 232585) might be a short-hard GRB
  80. GRB061006: Faulkes Telescope South Observations
  81. GRB 061004: Optical afterglow candidate and redshift
  82. GRB 061004: Las Campanas Optical/NIR Observations
  83. GRB061004: Swift/UVOT optical observations
  84. GRB 061004: Swift-XRT Team Refined Analysis
  85. GRB 061004, Swift BAT refined analysis
  86. GRB 061004: Nearby 2MASS Galaxy
  87. GRB 060928: Correction to GCN 5690
  88. Konus-Wind observation of GRB 060928
  89. GRB 060928: Suzaku/WAM observation of the prompt emission
  90. GRB 060928: Swift observations
  91. GRB 060928: RHESSI Spectral Fit
  92. IPN triangulation of GRB060928 (long, exceptionally bright)
  93. GRB061002: Swift UVOT followup observations
  94. GRB 060930: near-IR afterglow candidate
  95. GRB 061002: Swift-XRT Team Refined Analysis
  96. VLA observations of GRB 060926
  97. GRB 061002, Swift-BAT refined analysis
  98. GRB 060908: Detection of a possible host
  99. GRB 060923A: Probable host galaxy in the R-band
  100. GRB 060807: Detection of a possible host galaxy

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