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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23571 results found.

  1. GRB 071010B: Independent Confirmation of Break
  2. GRB071020A: Xinglong TNT Optical afterglow observations
  3. GRB 071020, Swift-BAT refined analysis
  4. GRB 071020: VLT spectroscopy
  5. GRB071020 - SDSS Pre-burst Observations
  6. GRB 071020: Swift detection of a bright burst
  7. GRB 071018: Mercator Telescope optical observations
  8. GRB071010b: optical observations
  9. GRB071018: Correction to the GCN 6936
  10. GRB071018: Correction to the GCN 6936
  11. GRB071018: Correction to the GCN 6936
  12. GRB 071018: Possible OT from Xinglong TNT observation
  13. GRB 071010B: Light Curve Break Confirmed
  14. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  15. GRB 071018, Swift-BAT refined analysis
  16. GRB 071018?: Swift detection of a possible burst
  17. GRB 071010B: Suzaku WAM observation of the prompt emission
  18. GRB 071013: 3rd TLS Epoch - constraints on variability
  19. GRB 071013: TNT optical data refined analysis
  20. GRB 071010B: Keck/DEIMOS emission-line redshift
  21. GRB 071017: a SHORT GRB detected by INTEGRAL
  22. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  23. GRB 071011: MITSuME Optical Observations
  24. GRB 071010B: Photometry after 1.6 days
  25. GRB 071010B: Keck/LRIS Photometry
  26. GRB 071013, Swift-BAT refined analysis
  27. GRB 20071013: Xinglong TNT optical Upper Limit
  28. GRB 071013: Swift detection of a burst
  29. GRB 071011: Optical Limit after 13.95hrs
  30. GRB 071010B correction to GCN 6892 optical observations
  31. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  32. GRB 071011, Optical afterglow
  33. GRB 071011: Confirmation of P60 optical afterglow
  34. GRB 071010B: Optical Detection
  35. GRB 071011: Kanazawa Optical limits
  36. GRB 071011: MARGE Optical Limits
  37. GRB 071010B optical photometry
  38. GRB 071010B: Keck/LRIS Spectroscopy
  39. GRB 071011, Swift-BAT refined analysis
  40. GRB 071011: Early Super-LOTIS Observations
  41. GRB 071011: NAYUTA Optical Observation
  42. GRB 071010A: Continued Keck Imaging
  43. GRB 071011: Optical afterglow candidate
  44. GRB 071011: Swift detection of a burst
  45. Konus-Wind observation of GRB 071010B
  46. GRB 071010B, Swift-BAT refined analysis
  47. GRB 071010A: bright NIR afterglow
  48. GRB 071006, Swift-BAT refined analysis
  49. GRB 071010A: Keck/LRIS Photometry
  50. GRB 071008, Swift-BAT refined analysis
  51. GRB 071010, Swift-BAT refined analysis
  52. Konus-Wind observation of GRB 071006
  53. GRB 071010: Keck/LRIS Spectroscopy
  54. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  55. GRB 071010: Rapid PROMPT Detections
  56. GRB 071010: Keck Observations of the Afterglow
  57. GRB 071010: TAROT La Silla observatory detection of the afterglow
  58. GRB 071010: Swift detection of a burst
  59. GRB 071006 Swift-BAT detection of a burst
  60. GRB 071008: Swift detection of a burst
  61. GRB070920A: MAGIC telescope GeV observation
  62. GRB 071003: VLT spectroscopy
  63. GRB 071003: Keck spectroscopy
  64. GRB071003: Faulkes Telescope North observations
  65. GRB 071003 : Lulin R-band observations
  66. GRB 071003, Swift-BAT refined analysis
  67. GRB 071003: MARGE Observations
  68. GRB 071003 Optical observations
  69. GRB 071003: KAIT optical afterglow observations
  70. GRB 071003: Swift detection of a bright burst
  71. GRB 070714B: host galaxy spectroscopic redshift
  72. GRB 071001: Swift-XRT Team refined analysis
  73. GRB 071001, Swift-BAT refined analysis
  74. GRB 071001: Swift detection of a burst
  75. GRB 070925: Gemini South Imaging
  76. GRB 070925: a long GRB detected by INTEGRAL
  77. Recent SGR1806-20 Activity
  78. GRB 070923, Swift-BAT refined analysis
  79. GRB 070923: Swift detection of a short hard burst
  80. GRB 070917: Suzaku/WAM observation of the prompt emission
  81. GRB 070920B: TAROT La Silla observatory optical observations
  82. GRB 070920B, Swift-BAT refined analysis
  83. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  84. GRB 070920B: NOT optical observations
  85. GRB 070920B: Swift detection of a burst
  86. GRB 070920, Swift-BAT refined analysis
  87. GRB 070920: TAROT Calern observatory optical observations
  88. GRB 070920: Swift detection of a burst
  89. SGR1806-20: Swift-BAT detection of enhanced activity
  90. Konus-Wind observation of GRB 070917
  91. Swift Status and XRT Calibration Uncertainties
  92. GRB 070917: KAIT optical limits
  93. GRB 070917, Swift-BAT refined analysis
  94. GRB 070917: Swift detection of a bright burst
  95. GRB 070911: Suzaku WAM observation of the prompt emission
  96. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  97. GRB 070913: Swift-BAT refined analysis
  98. GRB 070913: SMARTS optical/IR observations
  99. GRB 070913: TAROT La Silla observatory optical observations
  100. GRB 070913: Swift detection of a burst

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