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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"

23578 results found.

  1. GRB 071021, Swift-BAT refined analysis
  2. GRB071018: 2nd epoch obsevations of Xinglong TNT
  3. GRB 071021: Xinglong TNT optical Upper Limit
  4. GRB 071021 : Lulin R-band limit
  5. Konus-Wind observation of GRB 071020
  6. GRB 071021: Faulkes Telescope South optical candidate
  7. GRB 071021: Swift detection of a burst
  8. GRB 071010B: Independent Confirmation of Break
  9. GRB071020A: Xinglong TNT Optical afterglow observations
  10. GRB 071020, Swift-BAT refined analysis
  11. GRB 071020: VLT spectroscopy
  12. GRB071020 - SDSS Pre-burst Observations
  13. GRB 071020: Swift detection of a bright burst
  14. GRB 071018: Mercator Telescope optical observations
  15. GRB071010b: optical observations
  16. GRB071018: Correction to the GCN 6936
  17. GRB071018: Correction to the GCN 6936
  18. GRB071018: Correction to the GCN 6936
  19. GRB 071018: Possible OT from Xinglong TNT observation
  20. GRB 071010B: Light Curve Break Confirmed
  21. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  22. GRB 071018, Swift-BAT refined analysis
  23. GRB 071018?: Swift detection of a possible burst
  24. GRB 071010B: Suzaku WAM observation of the prompt emission
  25. GRB 071013: 3rd TLS Epoch - constraints on variability
  26. GRB 071013: TNT optical data refined analysis
  27. GRB 071010B: Keck/DEIMOS emission-line redshift
  28. GRB 071017: a SHORT GRB detected by INTEGRAL
  29. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  30. GRB 071011: MITSuME Optical Observations
  31. GRB 071010B: Photometry after 1.6 days
  32. GRB 071010B: Keck/LRIS Photometry
  33. GRB 071013, Swift-BAT refined analysis
  34. GRB 20071013: Xinglong TNT optical Upper Limit
  35. GRB 071013: Swift detection of a burst
  36. GRB 071011: Optical Limit after 13.95hrs
  37. GRB 071010B correction to GCN 6892 optical observations
  38. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  39. GRB 071011, Optical afterglow
  40. GRB 071011: Confirmation of P60 optical afterglow
  41. GRB 071010B: Optical Detection
  42. GRB 071011: Kanazawa Optical limits
  43. GRB 071011: MARGE Optical Limits
  44. GRB 071010B optical photometry
  45. GRB 071010B: Keck/LRIS Spectroscopy
  46. GRB 071011, Swift-BAT refined analysis
  47. GRB 071011: Early Super-LOTIS Observations
  48. GRB 071011: NAYUTA Optical Observation
  49. GRB 071010A: Continued Keck Imaging
  50. GRB 071011: Optical afterglow candidate
  51. GRB 071011: Swift detection of a burst
  52. Konus-Wind observation of GRB 071010B
  53. GRB 071010B, Swift-BAT refined analysis
  54. GRB 071010A: bright NIR afterglow
  55. GRB 071006, Swift-BAT refined analysis
  56. GRB 071010A: Keck/LRIS Photometry
  57. GRB 071008, Swift-BAT refined analysis
  58. GRB 071010, Swift-BAT refined analysis
  59. Konus-Wind observation of GRB 071006
  60. GRB 071010: Keck/LRIS Spectroscopy
  61. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  62. GRB 071010: Rapid PROMPT Detections
  63. GRB 071010: Keck Observations of the Afterglow
  64. GRB 071010: TAROT La Silla observatory detection of the afterglow
  65. GRB 071010: Swift detection of a burst
  66. GRB 071006 Swift-BAT detection of a burst
  67. GRB 071008: Swift detection of a burst
  68. GRB070920A: MAGIC telescope GeV observation
  69. GRB 071003: VLT spectroscopy
  70. GRB 071003: Keck spectroscopy
  71. GRB071003: Faulkes Telescope North observations
  72. GRB 071003 : Lulin R-band observations
  73. GRB 071003, Swift-BAT refined analysis
  74. GRB 071003: MARGE Observations
  75. GRB 071003 Optical observations
  76. GRB 071003: KAIT optical afterglow observations
  77. GRB 071003: Swift detection of a bright burst
  78. GRB 070714B: host galaxy spectroscopic redshift
  79. GRB 071001: Swift-XRT Team refined analysis
  80. GRB 071001, Swift-BAT refined analysis
  81. GRB 071001: Swift detection of a burst
  82. GRB 070925: Gemini South Imaging
  83. GRB 070925: a long GRB detected by INTEGRAL
  84. Recent SGR1806-20 Activity
  85. GRB 070923, Swift-BAT refined analysis
  86. GRB 070923: Swift detection of a short hard burst
  87. GRB 070917: Suzaku/WAM observation of the prompt emission
  88. GRB 070920B: TAROT La Silla observatory optical observations
  89. GRB 070920B, Swift-BAT refined analysis
  90. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  91. GRB 070920B: NOT optical observations
  92. GRB 070920B: Swift detection of a burst
  93. GRB 070920, Swift-BAT refined analysis
  94. GRB 070920: TAROT Calern observatory optical observations
  95. GRB 070920: Swift detection of a burst
  96. SGR1806-20: Swift-BAT detection of enhanced activity
  97. Konus-Wind observation of GRB 070917
  98. Swift Status and XRT Calibration Uncertainties
  99. GRB 070917: KAIT optical limits
  100. GRB 070917, Swift-BAT refined analysis

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