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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"

11452 results found.

  1. GRB 080506:Optical observations from HCT
  2. GRB 080507: GRB localization by SuperAGILE
  3. GRB 080506, Swift-BAT refined analysis
  4. GRB 080503, Swift-BAT refined analysis
  5. GRB 080430
  6. GRB 080430
  7. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  8. GRB 080503: Swift detection of a short burst
  9. GRB 080430 optical observations
  10. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  11. GRB 080430: Bootes observation
  12. GRB 080430: Swift detection of a burst with optical afterglow
  13. GRB 080320 : Faulkes Telescope North Observations
  14. Swift-BAT trigger 309665 is not a GRB
  15. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  16. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  17. GRB 080414: RTT150 optical observations
  18. GRB 080414: A long GRB detected by INTEGRAL
  19. GRB 080413B: Swift XRT refined analysis
  20. GRB 080413B, Swift-BAT refined analysis
  21. GRB 080413A: Swift-XRT refined analysis
  22. GRB 080413A Bootes observation
  23. GRB 080411: Swift-XRT Refined Analysis
  24. Konus-Wind observation of GRB 080411
  25. GRB 080411: Swift detection of a bright burst
  26. GRB 080330 optical observations
  27. GRB 080408: GRB Localization by SuperAGILE
  28. GRB 080405: Swift-BAT refined analysis
  29. GRB 080330, SMARTS optical/IR afterglow observations
  30. Konus-Wind observation of GRB 080328
  31. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  32. GRB 080325, Swift-BAT refined analysis
  33. GRB 080325: GROND Observations
  34. GRB080319B: optical observations
  35. GRB 080325: Early observations from OSN
  36. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  37. GRB 080319D: optical upper limit
  38. GRB 080319B - CARMA mm Observations
  39. GRB 080320: J detection with FLAMINGOS
  40. GRB 080319D: Swift XRT refined analysis
  41. Konus-Wind observation of GRB 080319C
  42. GRB 080319B: Gemini-South photometry
  43. GRB 080319B: Allen Telescope Array Observations
  44. Konus-Wind observation of GRB 080319B
  45. GRB 080319B: WSRT Radio Observations
  46. GRB 080320: Swift detection of a burst
  47. GRB 080320: ROTSE-III Optical Limits
  48. GRB 080319C: Swift detection of a burst with an optical afterglow
  49. GRB 080319B: Change in power law decay index
  50. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  51. Swift trigger 306323: Swift-BAT/XRT refined analysis
  52. GRB080310: Optical observation by MITSuME telescope
  53. GRB 080310, Swift-BAT refined analysis
  54. GRB080307: optical upper limit
  55. GRB080310 : Lulin optical observation
  56. GRB 080310: RRM optical photometry with the VLT
  57. GRB 080310, SMARTS optical/IR afterglow observations
  58. GRB080307, optical upper limit
  59. GRB080229, optical upper limit
  60. GRB080307: Optical upper limits
  61. GRB 080307, Preliminary Swift-BAT refined analysis
  62. GRB 080303, Swift-BAT refined analysis
  63. GRB 080303A: ROTSE-III Optical Limits
  64. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  65. GRB 080229A: ROTSE-III Optical Limits
  66. GRB 080229: Swift detection of a bright burst
  67. GRB080207: optical observations
  68. Swift-XRT improved positions, and new redshift limits.
  69. GRB 080218B: GROND upper limits
  70. GRB 080218: Swift detection of a burst
  71. Konus-Wind observation of GRB 080211
  72. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  73. GRB 080212: GROND detects afterglow
  74. GRB 080212: Swift detection of a burst
  75. IPN localization of GRB 080211
  76. GRB 080210: GOND detection in all bands and redshift upper limit
  77. GRB 080205: GAO 150cm telescope Optical limit
  78. GRB 080207, Swift-BAT refined analysis
  79. Swift detection of AX J1749.1-2639
  80. GRB 080207, Swift-BAT refined analysis
  81. GRB080207: RTT150 Optical Observations
  82. GRB 080207: TAROT Calern observatory optical observations
  83. GRB 080207: Swift detection of a burst
  84. Konus-Wind observation of GRB 080204
  85. GRB 080205 optical upper limit
  86. GRB 080205: optical observation
  87. IPN localization of very hard GRB 080204
  88. GRB 080205: Swift XRT refined analysis
  89. GRB 080130: further Swift XRT observations confirm fading source
  90. GRB 080130?: Detection of a possible burst by BATSS
  91. GRB 080129: Swift-XRT refined analysis
  92. GRB 080129: KAIT optical limits
  93. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  94. GRB 080129: optical limit by Pi of the Sky
  95. GRB 080129, Swift-BAT refined analysis
  96. A new website of high-level data products for Swift GRBs
  97. GRB 080121: Upper limit on X-ray afterglow
  98. Konus-Wind observation of GRB 080122
  99. SNe 2008D and 2007uy: Chandra Detections
  100. IPN triangulation of GRB080122

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