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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"

26171 results found.

  1. GRB 071010A: bright NIR afterglow
  2. GRB 071006, Swift-BAT refined analysis
  3. GRB 071010A: Keck/LRIS Photometry
  4. GRB 071008, Swift-BAT refined analysis
  5. GRB 071010, Swift-BAT refined analysis
  6. GRB 071010 REM NIR observations
  7. GRB 071010: TAROT La Silla observatory detection of the afterglow
  8. GRB 071008: Swift detection of a burst
  9. GRB 071003: XRT refined analysis
  10. GRB070920A: MAGIC telescope GeV observation
  11. Radio detection of GRB 071003 with the VLA
  12. GRB 070810B: further XRT analysis
  13. GRB 071003: Possible rebrightening
  14. GRB 071003 : Lulin R-band observations
  15. GRB 071003: Keck HIRES spectroscopy
  16. GRB 071003, Swift-BAT refined analysis
  17. GRB 071003: P60 Confirmation of Optical Afterglow
  18. GRB 071001: Swift-XRT Team refined analysis
  19. GRB 071001, Swift-BAT refined analysis
  20. Faulkes Telescope South observations of GRB 071001
  21. GRB 071001: Swift detection of a burst
  22. VLA observation of GRB 070923
  23. GRB 070911, SMARTS optical/IR afterglow observations
  24. GRB 070925: Gemini South Imaging
  25. GRB070925: Swift-XRT Position
  26. GRB 070920B: ROTSE-III Early Optical Limits
  27. GRB 070925: a long GRB detected by INTEGRAL
  28. GRB 070923, Swift-BAT refined analysis
  29. GRB 070920B: XRT observations
  30. GRB 070917: Suzaku/WAM observation of the prompt emission
  31. GRB 070920B: TAROT La Silla observatory optical observations
  32. GRB 070920B, Swift-BAT refined analysis
  33. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  34. GRB 070920B: NOT optical observations
  35. GRB 070920, Swift-BAT refined analysis
  36. GRB 070920: TAROT Calern observatory optical observations
  37. GRB 070917: P60 Observations
  38. Konus-Wind observation of GRB 070917
  39. Swift Status and XRT Calibration Uncertainties
  40. GRB 070917: Swift-XRT observations
  41. GRB 070917: MITSuME Akeno Ic upper limit
  42. GRB 070917: R band observations
  43. GRB 070917, Swift-BAT refined analysis
  44. GRB 070911: Suzaku WAM observation of the prompt emission
  45. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  46. GRB 070809: The Swift evidence for the SHB nature of this burst
  47. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  48. GRB 070913: Swift-BAT refined analysis
  49. GRB 070913: SMARTS optical/IR observations
  50. GRB 070913: TAROT La Silla observatory optical observations
  51. GRB 070911: PAIRITEL IR Observations
  52. GRB 070911: Swift XRT refined analysis
  53. GRB 070911, Swift-BAT refined analysis
  54. Intense burst from SGR 1806-20 detected on September 7
  55. GRB 070809: Confirmation of optical transient
  56. Candidate Orphan GRB Optical Transient in IC 4779
  57. Las Campanas observations of possible TAROT GRB transient near IC
  58. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  59. GRB 070824 - Combined SuperAGILE/IPN Localization
  60. GRB 070731: Swift/UVOT Upper Limit
  61. GRB 070805: UVOT afterglow candidate retraction
  62. GRB 070810B : Faulkes Telescope South Observations
  63. GRB 070810A: Continued Keck Imaging
  64. GRB 070810B: Keck spectroscopy of possible host galaxies
  65. GRB070810B: Swift/UVOT Upper Limits
  66. GRB 070810B: XRT refined analysis
  67. GRB 070810B, Swift-BAT refined analysis
  68. Swift Trigger 287421: False trigger due to star tracker loss
  69. GRB 070810A: Swift-BAT refined analysis
  70. GRB 070810B: Xinglong TNT optical Upper Limit
  71. GRB070810B: Optical observations with KANATA
  72. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  73. GRB 070809: Swift/UVOT Upper Limits
  74. VLA upper limit on the short hard burst GRB 070729
  75. No radio detection in superAGILE burst 070724B
  76. GRB 070809: Keck Imaging
  77. GRB 070810: Swift-XRT Team Refined Analysis
  78. GRB 070809: Swift-XRT refined analysis
  79. GRB 070810: enhanced Swift-XRT position
  80. GRB 070810: Swift/UVOT Optical Counterpart
  81. GRB 070809, Swift-BAT refined analysis
  82. GRB 070808: Swift/UVOT upper limits
  83. GRB 070809: Swift detection of a short burst
  84. GRB 070808 : Faulkes Telescope South Observations
  85. GCN Swift XRT update position notices and enhanced position circulars
  86. GRB 070808: Swift XRT refined analysis
  87. GRB 070808, Swift-BAT refined analysis
  88. GRB 070808: OPTIMA-Burst optical upper limit
  89. GRB 070808: Xinglong TNT optical Upper Limit
  90. GRB070808: Optical observations with KANATA
  91. GRB070808 - SDSS Pre-Burst Observations
  92. GRB 070808: ROTSE-III Optical Limits
  93. GRB070805 XRT and UVOT afterglow candidate
  94. GRB070612A: Radio upper limit from GMRT
  95. GRB 070721B: correct afterglow position
  96. Swift/UVOT observations of GRB070805
  97. GRB 070805, Swift-BAT refined analysis
  98. UVOT observations of SAXJ1810.8-2609
  99. Swift detection of a outburst from SAX J1810.8-2609
  100. VLA non-detection of GRB 070721B

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