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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"

11503 results found.

  1. IPN triangulation of bright GRB 080513
  2. GRB 080514B: KPNO 4m IR observations
  3. GRB 080514B: slow fading behaviour ?
  4. GRB 080514B: Swift-XRT analysis
  5. GRB 080514B: SuperAGILE/IPN GRB Localization
  6. Konus-Wind observation of GRB 080507
  7. GRB 080507: E Pur Si Muove!
  8. GRB 080503: Hubble Space Telescope Imaging
  9. GRB 080506:Optical observations from HCT
  10. GRB 080507: GRB localization by SuperAGILE
  11. GRB 080506, Swift-BAT refined analysis
  12. GRB 080503, Swift-BAT refined analysis
  13. GRB 080430
  14. GRB 080430
  15. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  16. GRB 080503: Swift detection of a short burst
  17. GRB 080430 optical observations
  18. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  19. GRB 080430: Bootes observation
  20. GRB 080430: Swift detection of a burst with optical afterglow
  21. GRB 080320 : Faulkes Telescope North Observations
  22. Swift-BAT trigger 309665 is not a GRB
  23. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  24. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  25. GRB 080414: RTT150 optical observations
  26. GRB 080414: A long GRB detected by INTEGRAL
  27. GRB 080413B: Swift XRT refined analysis
  28. GRB 080413B, Swift-BAT refined analysis
  29. GRB 080413A: Swift-XRT refined analysis
  30. GRB 080413A Bootes observation
  31. GRB 080411: Swift-XRT Refined Analysis
  32. Konus-Wind observation of GRB 080411
  33. GRB 080411: Swift detection of a bright burst
  34. GRB 080330 optical observations
  35. GRB 080408: GRB Localization by SuperAGILE
  36. GRB 080405: Swift-BAT refined analysis
  37. GRB 080330, SMARTS optical/IR afterglow observations
  38. Konus-Wind observation of GRB 080328
  39. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  40. GRB 080325, Swift-BAT refined analysis
  41. GRB 080325: GROND Observations
  42. GRB080319B: optical observations
  43. GRB 080325: Early observations from OSN
  44. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  45. GRB 080319D: optical upper limit
  46. GRB 080319B - CARMA mm Observations
  47. GRB 080320: J detection with FLAMINGOS
  48. GRB 080319D: Swift XRT refined analysis
  49. Konus-Wind observation of GRB 080319C
  50. GRB 080319B: Gemini-South photometry
  51. GRB 080319B: Allen Telescope Array Observations
  52. Konus-Wind observation of GRB 080319B
  53. GRB 080319B: WSRT Radio Observations
  54. GRB 080320: Swift detection of a burst
  55. GRB 080320: ROTSE-III Optical Limits
  56. GRB 080319C: Swift detection of a burst with an optical afterglow
  57. GRB 080319B: Change in power law decay index
  58. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  59. Swift trigger 306323: Swift-BAT/XRT refined analysis
  60. GRB080310: Optical observation by MITSuME telescope
  61. GRB 080310, Swift-BAT refined analysis
  62. GRB080307: optical upper limit
  63. GRB080310 : Lulin optical observation
  64. GRB 080310: RRM optical photometry with the VLT
  65. GRB 080310, SMARTS optical/IR afterglow observations
  66. GRB080307, optical upper limit
  67. GRB080229, optical upper limit
  68. GRB080307: Optical upper limits
  69. GRB 080307, Preliminary Swift-BAT refined analysis
  70. GRB 080303, Swift-BAT refined analysis
  71. GRB 080303A: ROTSE-III Optical Limits
  72. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  73. GRB 080229A: ROTSE-III Optical Limits
  74. GRB 080229: Swift detection of a bright burst
  75. GRB080207: optical observations
  76. Swift-XRT improved positions, and new redshift limits.
  77. GRB 080218B: GROND upper limits
  78. GRB 080218: Swift detection of a burst
  79. Konus-Wind observation of GRB 080211
  80. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  81. GRB 080212: GROND detects afterglow
  82. GRB 080212: Swift detection of a burst
  83. IPN localization of GRB 080211
  84. GRB 080210: GOND detection in all bands and redshift upper limit
  85. GRB 080205: GAO 150cm telescope Optical limit
  86. GRB 080207, Swift-BAT refined analysis
  87. Swift detection of AX J1749.1-2639
  88. GRB 080207, Swift-BAT refined analysis
  89. GRB080207: RTT150 Optical Observations
  90. GRB 080207: TAROT Calern observatory optical observations
  91. GRB 080207: Swift detection of a burst
  92. Konus-Wind observation of GRB 080204
  93. GRB 080205 optical upper limit
  94. GRB 080205: optical observation
  95. IPN localization of very hard GRB 080204
  96. GRB 080205: Swift XRT refined analysis
  97. GRB 080130: further Swift XRT observations confirm fading source
  98. GRB 080130?: Detection of a possible burst by BATSS
  99. GRB 080129: Swift-XRT refined analysis
  100. GRB 080129: KAIT optical limits

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