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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"

27322 results found.

  1. GRB071020 - SDSS Pre-burst Observations
  2. GRB 071020: Swift detection of a bright burst
  3. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  4. GRB 071018: Mercator Telescope optical observations
  5. Swift autonomous slewing re-enabled
  6. GRB 071018: SARA observations
  7. GRB 071018: Swift-XRT observation
  8. GRB 071017 - Swift XRT observations
  9. GRB 071018: Possible OT from Xinglong TNT observation
  10. GRB 071010B: Light Curve Break Confirmed
  11. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  12. GRB 071018, Swift-BAT refined analysis
  13. GRB 071010B: Suzaku WAM observation of the prompt emission
  14. GRB 071013: 3rd TLS Epoch - constraints on variability
  15. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  16. GRB 071010B: Optical observations of EST
  17. GRB 071011: MITSuME Optical Observations
  18. GRB 070920A: deep optical observations at the NOT
  19. GRB 071010B: Keck/LRIS Photometry
  20. GRB 071013: TLS Upper Limit
  21. VLA non-detection of GRB 071011
  22. GRB 071013: Optical observations
  23. GRB 071013: optical observations at NOT
  24. GRB 071013, Swift-BAT refined analysis
  25. GRB071010B, BVRcIc field calibration
  26. GRB 20071013: Xinglong TNT optical Upper Limit
  27. GRB 071010C Swift-BAT detection of a burst
  28. GRB 071011: Optical Limit after 13.95hrs
  29. GRB 071010B correction to GCN 6892 optical observations
  30. GRB 071011: Swift-XRT refined analysis
  31. VLA non-detection of GRB 071010A
  32. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  33. GRB 071011: Confirmation of P60 optical afterglow
  34. GRB 071010B: Optical Detection
  35. GRB 071011: Kanazawa Optical limits
  36. GRB 071011: P60 Optical Afterglow Candidate
  37. GRB 071011: MARGE Optical Limits
  38. GRB 071010B: Super-LOTIS upper limit
  39. GRB 071010B optical photometry
  40. GRB 071011: XRT afterglow detection
  41. GRB 071011, Swift-BAT refined analysis
  42. GRB 071010B: Gemini Spectroscopic Observations
  43. GRB 071011: NAYUTA Optical Observation
  44. GRB 071010A: Continued Keck Imaging
  45. GRB 071010B: Bright OT confirmed with TLS
  46. GRB 071011: Swift detection of a burst
  47. Optical Observation: GRB 071010
  48. Optical observations: GRB 071010A
  49. Konus-Wind observation of GRB 071010B
  50. GRB071010B: Swift/XRT detection
  51. GRB 071010B, Swift-BAT refined analysis
  52. GRB 071010A: bright NIR afterglow
  53. GRB 071006, Swift-BAT refined analysis
  54. GRB 071010A: Keck/LRIS Photometry
  55. GRB 071008, Swift-BAT refined analysis
  56. GRB 071010, Swift-BAT refined analysis
  57. GRB 071010 REM NIR observations
  58. GRB 071010: TAROT La Silla observatory detection of the afterglow
  59. GRB 071008: Swift detection of a burst
  60. GRB 071003: XRT refined analysis
  61. GRB070920A: MAGIC telescope GeV observation
  62. Radio detection of GRB 071003 with the VLA
  63. GRB 070810B: further XRT analysis
  64. GRB 071003: Possible rebrightening
  65. GRB 071003 : Lulin R-band observations
  66. GRB 071003: Keck HIRES spectroscopy
  67. GRB 071003, Swift-BAT refined analysis
  68. GRB 071003: P60 Confirmation of Optical Afterglow
  69. GRB 071001: Swift-XRT Team refined analysis
  70. GRB 071001, Swift-BAT refined analysis
  71. Faulkes Telescope South observations of GRB 071001
  72. GRB 071001: Swift detection of a burst
  73. VLA observation of GRB 070923
  74. GRB 070911, SMARTS optical/IR afterglow observations
  75. GRB 070925: Gemini South Imaging
  76. GRB070925: Swift-XRT Position
  77. GRB 070920B: ROTSE-III Early Optical Limits
  78. GRB 070925: a long GRB detected by INTEGRAL
  79. GRB 070923, Swift-BAT refined analysis
  80. GRB 070920B: XRT observations
  81. GRB 070917: Suzaku/WAM observation of the prompt emission
  82. GRB 070920B: TAROT La Silla observatory optical observations
  83. GRB 070920B, Swift-BAT refined analysis
  84. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  85. GRB 070920B: NOT optical observations
  86. GRB 070920, Swift-BAT refined analysis
  87. GRB 070920: TAROT Calern observatory optical observations
  88. GRB 070917: P60 Observations
  89. Konus-Wind observation of GRB 070917
  90. Swift Status and XRT Calibration Uncertainties
  91. GRB 070917: Swift-XRT observations
  92. GRB 070917: MITSuME Akeno Ic upper limit
  93. GRB 070917: R band observations
  94. GRB 070917, Swift-BAT refined analysis
  95. GRB 070911: Suzaku WAM observation of the prompt emission
  96. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  97. GRB 070809: The Swift evidence for the SHB nature of this burst
  98. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  99. GRB 070913: Swift-BAT refined analysis
  100. GRB 070913: SMARTS optical/IR observations

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