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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42261 results found.

  1. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  2. GRB 070611; Swift-XRT position
  3. GRB 070611: ROTSE-III Optical Limits
  4. GRB 070611: Swift detection of a burst
  5. GRB 070610: Swift-UVOT Upper Limits
  6. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  7. GRB 070610, Swift-BAT refined analysis
  8. GRB 070610; Swift-XRT position
  9. GRB 070610: Swift detection of a burst
  10. GRB 070412: TAROT Calern observatory optical observations
  11. GRB 070411: TAROT Calern observatory optical observations
  12. GRB 070419A, deep LBT photometry and possible supernova detection
  13. GRB070520B: optical observations
  14. GRB070520: optical observation
  15. GRB070518: optical observation
  16. GRB070521: optical observation
  17. Swift/UVOT refined analysis of GRB070531
  18. GRB 070531: Swift-BAT refined analysis
  19. GRB 070531: Swift-XRT position
  20. GRB 070531: Liverpool Telescope Optical Observations
  21. GRB 070531: Swift detection of a burst
  22. GRB 070529: SARA upper limit
  23. Swift/UVOT refined analysis of GRB070529
  24. GRB 070529: MARGE Observations
  25. GRB 070529: Optical aterglow from MIRO
  26. GRB 070529: Gemini Redshift
  27. GRB 070529: Swift-XRT refined analysis
  28. GRB 070529, Swift-BAT refined analysis
  29. GRB 070529: Xinglong TNT Optical Upper Limit
  30. GRB 070529: Swift detection of a burst with an optical aterglow
  31. GRB 070412: Deep Keck imaging
  32. Swift trigger 280447 is probably a Galactic transient
  33. GRB 070518, deep LBT photometry
  34. GRB 070518: MARGE Observations
  35. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  36. Konus-Wind observation of GRB 070521
  37. GRB 070518: optical observation
  38. GRB070521: Second Epoch Gemini Imaging
  39. GRB070521: NIR observations
  40. GRB070520B: NIR observations
  41. GRB 070521, optical observation
  42. GRB 070521: Swift-XRT refined analysis
  43. GRB 070521: Keck imaging
  44. GRB070521: Gemini Observations
  45. GROND upper limits of GRB 070521
  46. GRB 070521 Milagro GeV/TeV Observations
  47. GRB 070521: SARA upper limit
  48. GRB 070521: Subaru observations and possible host detection
  49. GRB070518: Optical/NIR observation
  50. GRB 070520A: Subaru Observations
  51. GRB 070521, Swift-BAT refined analysis
  52. GRB 070520B: Swift-XRT refined analysis
  53. GRB 070521: optical limit by Pi of the Sky
  54. GRB070521: P200 Observations
  55. GRB070521 : Faulkes Telescope North Observations
  56. GRB 070521: TAROT La Silla observatory optical observations
  57. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  58. GRB070521 - SDSS Pre-Burst Observations
  59. GRB 070521: Swift detection of a burst
  60. GRB 070520A: MITSuME Akeno optical upper limits
  61. GRB 070520B, Swift-BAT refined analysis
  62. GRB 070520A, Swift-BAT refined analysis
  63. GRB 070520A: Swift-XRT refined analysis
  64. GRB 070518: TNG observations
  65. GRB 070520B: Swift detection of a burst
  66. GRB 070520: Xinglong EST optical Upper Limit
  67. GRB 070520: Swift detection of a burst
  68. GRB 070518: Swift-XRT refined analysis
  69. GRB 070517: Gemini optical imaging
  70. GRB070518: OSN observation
  71. GRB 070518, Swift-BAT refined analysis
  72. GRB 070518: OT confirmed form Xinglong TNT observation
  73. GRB 070518: Swift detection of a burst with optical afterglow
  74. GRB070517: Swift-XRT Refined Analysis
  75. GRB 070517, Swift-BAT refined analysis
  76. GRB 070517: Optical search
  77. GRB 070517: Swift detection of a burst
  78. GRB 070509: objects inside XRT error circle
  79. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  80. GRB 070512: IPN localization and Konus spectrum of a bright burst
  81. GRB070419A: optical observations
  82. GRB 070419A, Deep LBT photometry
  83. GRB 070508: pseudo-z from 4 different spectral analyses
  84. Konus-Wind and Konus-A observation of GRB 070508
  85. GRB 070510: Swift detection of a possible burst
  86. GRB070509: Swift-XRT Refined Analysis
  87. RHESSI Spectrum of GRB070508
  88. GRB 070508: OA fading and tentative redshift
  89. GRB 070509, Swift-BAT refined analysis
  90. GRB 070508: Suzaku/WAM observation of the prompt emission
  91. GRB 070509: REM observations
  92. GRB 070509: Swift detection of a burst
  93. GRB 070509: ROTSE-III Optical Limits
  94. GRB070508: Swift/UVOT Observations
  95. GRB 070508, SMARTS optical afterglow observation
  96. GRB 070508, Swift-BAT refined analysis
  97. GRB 070508: Multicolor optical observations and possible redshift limit
  98. GRB 070508: Swift-XRT refined analysis
  99. GRB 070508: Optical observation limiting magnitude
  100. GRB 070508: Optical afterglow detection

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