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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"

26355 results found.

  1. GRB 071003: P60 Confirmation of Optical Afterglow
  2. GRB 071001: Swift-XRT Team refined analysis
  3. GRB 071001, Swift-BAT refined analysis
  4. Faulkes Telescope South observations of GRB 071001
  5. GRB 071001: Swift detection of a burst
  6. VLA observation of GRB 070923
  7. GRB 070911, SMARTS optical/IR afterglow observations
  8. GRB 070925: Gemini South Imaging
  9. GRB070925: Swift-XRT Position
  10. GRB 070920B: ROTSE-III Early Optical Limits
  11. GRB 070925: a long GRB detected by INTEGRAL
  12. GRB 070923, Swift-BAT refined analysis
  13. GRB 070920B: XRT observations
  14. GRB 070917: Suzaku/WAM observation of the prompt emission
  15. GRB 070920B: TAROT La Silla observatory optical observations
  16. GRB 070920B, Swift-BAT refined analysis
  17. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  18. GRB 070920B: NOT optical observations
  19. GRB 070920, Swift-BAT refined analysis
  20. GRB 070920: TAROT Calern observatory optical observations
  21. GRB 070917: P60 Observations
  22. Konus-Wind observation of GRB 070917
  23. Swift Status and XRT Calibration Uncertainties
  24. GRB 070917: Swift-XRT observations
  25. GRB 070917: MITSuME Akeno Ic upper limit
  26. GRB 070917: R band observations
  27. GRB 070917, Swift-BAT refined analysis
  28. GRB 070911: Suzaku WAM observation of the prompt emission
  29. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  30. GRB 070809: The Swift evidence for the SHB nature of this burst
  31. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  32. GRB 070913: Swift-BAT refined analysis
  33. GRB 070913: SMARTS optical/IR observations
  34. GRB 070913: TAROT La Silla observatory optical observations
  35. GRB 070911: PAIRITEL IR Observations
  36. GRB 070911: Swift XRT refined analysis
  37. GRB 070911, Swift-BAT refined analysis
  38. Intense burst from SGR 1806-20 detected on September 7
  39. GRB 070809: Confirmation of optical transient
  40. Candidate Orphan GRB Optical Transient in IC 4779
  41. Las Campanas observations of possible TAROT GRB transient near IC
  42. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  43. GRB 070824 - Combined SuperAGILE/IPN Localization
  44. GRB 070731: Swift/UVOT Upper Limit
  45. GRB 070805: UVOT afterglow candidate retraction
  46. GRB 070810B : Faulkes Telescope South Observations
  47. GRB 070810A: Continued Keck Imaging
  48. GRB 070810B: Keck spectroscopy of possible host galaxies
  49. GRB070810B: Swift/UVOT Upper Limits
  50. GRB 070810B: XRT refined analysis
  51. GRB 070810B, Swift-BAT refined analysis
  52. Swift Trigger 287421: False trigger due to star tracker loss
  53. GRB 070810A: Swift-BAT refined analysis
  54. GRB 070810B: Xinglong TNT optical Upper Limit
  55. GRB070810B: Optical observations with KANATA
  56. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  57. GRB 070809: Swift/UVOT Upper Limits
  58. VLA upper limit on the short hard burst GRB 070729
  59. No radio detection in superAGILE burst 070724B
  60. GRB 070809: Keck Imaging
  61. GRB 070810: Swift-XRT Team Refined Analysis
  62. GRB 070809: Swift-XRT refined analysis
  63. GRB 070810: enhanced Swift-XRT position
  64. GRB 070810: Swift/UVOT Optical Counterpart
  65. GRB 070809, Swift-BAT refined analysis
  66. GRB 070808: Swift/UVOT upper limits
  67. GRB 070809: Swift detection of a short burst
  68. GRB 070808 : Faulkes Telescope South Observations
  69. GCN Swift XRT update position notices and enhanced position circulars
  70. GRB 070808: Swift XRT refined analysis
  71. GRB 070808, Swift-BAT refined analysis
  72. GRB 070808: OPTIMA-Burst optical upper limit
  73. GRB 070808: Xinglong TNT optical Upper Limit
  74. GRB070808: Optical observations with KANATA
  75. GRB070808 - SDSS Pre-Burst Observations
  76. GRB 070808: ROTSE-III Optical Limits
  77. GRB070805 XRT and UVOT afterglow candidate
  78. GRB070612A: Radio upper limit from GMRT
  79. GRB 070721B: correct afterglow position
  80. Swift/UVOT observations of GRB070805
  81. GRB 070805, Swift-BAT refined analysis
  82. UVOT observations of SAXJ1810.8-2609
  83. Swift detection of a outburst from SAX J1810.8-2609
  84. VLA non-detection of GRB 070721B
  85. GRB 070802: REM optical observations
  86. GRB 070802: Swift-XRT refined analysis
  87. GRB070802: Swift/UVOT upper limits
  88. GRB 070802, Swift-BAT refined analysis
  89. GRB 070802: V-band detection of the candidate afterglow
  90. GRB 070802: GROND J band candidate
  91. GRB 070731, Swift-BAT refined analysis
  92. Konus-A observation of GRB 070729
  93. Swift/UVOT detection of GRB070714B
  94. VLA upper limit on short hard burst GRB 070714B
  95. Intense burst from SGR 1806-20 detected on July 27
  96. GRB070729: Swift/UVOT upper limits
  97. GRB 070729: Swift-XRT refined analysis
  98. GRB 070729, Swift-BAT refined analysis
  99. GRB 070724B: P60 Observations
  100. GRB 070724B: Swift/UVOT Upper limits

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