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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"

26121 results found.

  1. GRB 070610: Swift-UVOT Upper Limits
  2. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  3. GRB 070610, Swift-BAT refined analysis
  4. GRB 070610; Swift-XRT position
  5. GRB 070610: Swift detection of a burst
  6. GRB 070412: TAROT Calern observatory optical observations
  7. GRB 070411: TAROT Calern observatory optical observations
  8. GRB 070419A, deep LBT photometry and possible supernova detection
  9. GRB070520B: optical observations
  10. GRB070520: optical observation
  11. GRB070521: optical observation
  12. Swift/UVOT refined analysis of GRB070531
  13. GRB 070531: NOT nIR observations
  14. GRB 070531: Swift-BAT refined analysis
  15. GRB 070531: I-band observations from IAC80
  16. GRB 070531: Swift-XRT position
  17. GRB 070531: Liverpool Telescope Optical Observations
  18. GRB 070531: Swift detection of a burst
  19. GRB 070529: SARA upper limit
  20. Swift/UVOT refined analysis of GRB070529
  21. GRB 070529: MARGE Observations
  22. GRB 070529: Optical aterglow from MIRO
  23. GRB 070529: Gemini Redshift
  24. GRB 070529: Swift-XRT refined analysis
  25. GRB 070529, Swift-BAT refined analysis
  26. GRB 070529: Swift detection of a burst with an optical aterglow
  27. GRB 070412: Deep Keck imaging
  28. Swift Triggers 280447, 280450 and 280451 are invalid
  29. Swift trigger 280447 is probably a Galactic transient
  30. GRB 070518, deep LBT photometry
  31. GRB 070518: MARGE Observations
  32. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  33. Konus-Wind observation of GRB 070521
  34. GRB070521: Second Epoch Gemini Imaging
  35. GRB070521: NIR observations
  36. GRB070520B: NIR observations
  37. GRB 070521: Swift/UVOT Upper Limits
  38. GRB 070521: Swift-XRT refined analysis
  39. GRB 070521: Keck imaging
  40. GROND upper limits of GRB 070521
  41. GRB 070521 Milagro GeV/TeV Observations
  42. GRB 070521: SARA upper limit
  43. GRB 070521: Subaru observations and possible host detection
  44. GRB070518: Optical/NIR observation
  45. GRB 070520B: Swift/UVOT Upper Limits
  46. GRB 070520A: Subaru Observations
  47. GRB 070521, Swift-BAT refined analysis
  48. GRB 070520A: Swift UVOT Upper Limits
  49. GRB 070520B: Swift-XRT refined analysis
  50. GRB 070521: optical limit by Pi of the Sky
  51. GRB070521: P200 Observations
  52. GRB070521 : Faulkes Telescope North Observations
  53. GRB 070521: TAROT La Silla observatory optical observations
  54. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  55. GRB070521 - SDSS Pre-Burst Observations
  56. GRB 070521: Swift detection of a burst
  57. GRB 070520A: MITSuME Akeno optical upper limits
  58. GRB 070520B, Swift-BAT refined analysis
  59. GRB 070520A, Swift-BAT refined analysis
  60. GRB 070520A: Swift-XRT refined analysis
  61. GRB 070518: TNG observations
  62. GRB 070520B: Swift detection of a burst
  63. GRB 070520: Swift detection of a burst
  64. VLA observation of GRB 070518
  65. GRB 070518: Swift-XRT refined analysis
  66. GRB 070517: Gemini optical imaging
  67. GRB070518: UVOT refined analysis
  68. GRB070518: OSN observation
  69. GRB 070518, Swift-BAT refined analysis
  70. GRB 070518: Swift detection of a burst with optical afterglow
  71. GRB070517: Swift-XRT Refined Analysis
  72. GRB 070517, Swift-BAT refined analysis
  73. GRB 070517: Swift detection of a burst
  74. GRB 070509: objects inside XRT error circle
  75. GRB 070512: IPN localization and Konus spectrum of a bright burst
  76. GRB070419A: optical observations
  77. GRB 070419A, Deep LBT photometry
  78. GRB 070508: pseudo-z from 4 different spectral analyses
  79. GRB 070509: Swift/UVOT Upper Limits
  80. Konus-Wind and Konus-A observation of GRB 070508
  81. Swift-BAT trigger 278987 is not a GRB
  82. GRB 070510: Swift detection of a possible burst
  83. GRB070509: Swift-XRT Refined Analysis
  84. GRB 070508: OA fading and tentative redshift
  85. GRB 070509, Swift-BAT refined analysis
  86. GRB 070508: Suzaku/WAM observation of the prompt emission
  87. GRB 070509: REM observations
  88. GRB 070509: Swift detection of a burst
  89. GRB 070509: ROTSE-III Optical Limits
  90. GRB070508: Swift/UVOT Observations
  91. GRB 070508, SMARTS optical afterglow observation
  92. GRB 070508, Swift-BAT refined analysis
  93. GRB 070508: Multicolor optical observations and possible redshift limit
  94. GRB 070508: Swift-XRT refined analysis
  95. GRB 070508: Optical afterglow detection
  96. GRB 070508: REM observations
  97. GRB 070508: TAROT La Silla observatory optical observations
  98. GRB 070508: Swift detection of an intense burst with an optical counterpart
  99. GRB070412: MAGIC telescope GeV observation
  100. Swift-BAT trigger 278809 is not a GRB

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