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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"

37697 results found.

  1. GRB 070611: Swift/UVOT Observations
  2. GRB 070611: Swift-XRT refined analysis
  3. GRB 070611, Swift-BAT refined analysis
  4. GRB 070610: Optical observations from OSN
  5. GRB 070610: Watcher Observations
  6. GRB 070611: VLT redshift
  7. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  8. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  9. GRB 070611; Swift-XRT position
  10. GRB 070611: ROTSE-III Optical Limits
  11. GRB 070611: Swift detection of a burst
  12. GRB 070610: Swift-UVOT Upper Limits
  13. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  14. GRB 070610, Swift-BAT refined analysis
  15. GRB 070610; Swift-XRT position
  16. GRB 070610: Swift detection of a burst
  17. GRB 070412: TAROT Calern observatory optical observations
  18. GRB 070411: TAROT Calern observatory optical observations
  19. GRB 070419A, deep LBT photometry and possible supernova detection
  20. GRB070520B: optical observations
  21. GRB070520: optical observation
  22. GRB070518: optical observation
  23. GRB070521: optical observation
  24. GRB 070531: NOT nIR observations
  25. GRB 070531: Swift-BAT refined analysis
  26. GRB 070531: I-band observations from IAC80
  27. GRB 070531: Swift-XRT position
  28. GRB 070531: Liverpool Telescope Optical Observations
  29. GRB 070531: Swift detection of a burst
  30. GRB 070529: SARA upper limit
  31. GRB 070529: MARGE Observations
  32. GRB 070529: Optical aterglow from MIRO
  33. GRB 070529: Gemini Redshift
  34. GRB 070529: Swift-XRT refined analysis
  35. GRB 070529, Swift-BAT refined analysis
  36. GRB 070529: Xinglong TNT Optical Upper Limit
  37. GRB 070529: Swift detection of a burst with an optical aterglow
  38. GRB 070412: Deep Keck imaging
  39. Swift trigger 280447 is probably a Galactic transient
  40. GRB 070518, deep LBT photometry
  41. GRB 070518: MARGE Observations
  42. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  43. Konus-Wind observation of GRB 070521
  44. GRB 070518: optical observation
  45. GRB070520B: NIR observations
  46. GRB 070521: Swift/UVOT Upper Limits
  47. GRB 070521, optical observation
  48. GRB 070521: Swift-XRT refined analysis
  49. GRB 070521: Keck imaging
  50. GROND upper limits of GRB 070521
  51. GRB 070521 Milagro GeV/TeV Observations
  52. GRB 070520B: SARA upper limit
  53. GRB 070520A: SARA upper limit
  54. GRB 070521: SARA upper limit
  55. GRB 070521: Subaru observations and possible host detection
  56. GRB 070520B: Swift/UVOT Upper Limits
  57. GRB 070520A: Subaru Observations
  58. GRB 070521, Swift-BAT refined analysis
  59. GRB 070520A: Swift UVOT Upper Limits
  60. GRB 070520B: Swift-XRT refined analysis
  61. GRB 070521: optical limit by Pi of the Sky
  62. GRB070521 : Faulkes Telescope North Observations
  63. GRB 070521: TAROT La Silla observatory optical observations
  64. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  65. GRB070521 - SDSS Pre-Burst Observations
  66. GRB 070521: Swift detection of a burst
  67. GRB 070520A: MITSuME Akeno optical upper limits
  68. GRB 070520B, Swift-BAT refined analysis
  69. GRB 070520A, Swift-BAT refined analysis
  70. GRB 070520A: Swift-XRT refined analysis
  71. GRB 070518: TNG observations
  72. GRB 070520B: Swift detection of a burst
  73. GRB 070520: Xinglong EST optical Upper Limit
  74. GRB 070520: Swift detection of a burst
  75. VLA observation of GRB 070518
  76. GRB 070518: Swift-XRT refined analysis
  77. GRB 070517: Gemini optical imaging
  78. GRB070518: OSN observation
  79. GRB 070518, Swift-BAT refined analysis
  80. GRB 070518: OT confirmed form Xinglong TNT observation
  81. GRB 070518: Swift detection of a burst with optical afterglow
  82. GRB 070517, Swift-BAT refined analysis
  83. GRB 070517: Optical search
  84. GRB 070517: Swift detection of a burst
  85. GRB 070509: objects inside XRT error circle
  86. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  87. GRB 070512: IPN localization and Konus spectrum of a bright burst
  88. GRB070419A: optical observations
  89. GRB 070419A, Deep LBT photometry
  90. GRB 070508: pseudo-z from 4 different spectral analyses
  91. GRB 070509: Swift/UVOT Upper Limits
  92. Konus-Wind and Konus-A observation of GRB 070508
  93. Swift-BAT trigger 278987 is not a GRB
  94. GRB 070510: Swift detection of a possible burst
  95. GRB070509: Swift-XRT Refined Analysis
  96. GRB 070508: OA fading and tentative redshift
  97. GRB 070509, Swift-BAT refined analysis
  98. GRB 070508: Suzaku/WAM observation of the prompt emission
  99. GRB 070509: REM observations
  100. GRB 070509: Swift detection of a burst

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