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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"

28061 results found.

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

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