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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"

26122 results found.

  1. GRB 070611: Swift detection of a burst
  2. GRB 070610: Swift-UVOT Upper Limits
  3. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  4. GRB 070610, Swift-BAT refined analysis
  5. GRB 070610; Swift-XRT position
  6. GRB 070610: Swift detection of a burst
  7. GRB 070412: TAROT Calern observatory optical observations
  8. GRB 070411: TAROT Calern observatory optical observations
  9. GRB 070419A, deep LBT photometry and possible supernova detection
  10. GRB070520B: optical observations
  11. GRB070520: optical observation
  12. GRB070521: optical observation
  13. Swift/UVOT refined analysis of GRB070531
  14. GRB 070531: NOT nIR observations
  15. GRB 070531: Swift-BAT refined analysis
  16. GRB 070531: I-band observations from IAC80
  17. GRB 070531: Swift-XRT position
  18. GRB 070531: Liverpool Telescope Optical Observations
  19. GRB 070531: Swift detection of a burst
  20. GRB 070529: SARA upper limit
  21. Swift/UVOT refined analysis of GRB070529
  22. GRB 070529: MARGE Observations
  23. GRB 070529: Optical aterglow from MIRO
  24. GRB 070529: Gemini Redshift
  25. GRB 070529: Swift-XRT refined analysis
  26. GRB 070529, Swift-BAT refined analysis
  27. GRB 070529: Swift detection of a burst with an optical aterglow
  28. GRB 070412: Deep Keck imaging
  29. Swift Triggers 280447, 280450 and 280451 are invalid
  30. Swift trigger 280447 is probably a Galactic transient
  31. GRB 070518, deep LBT photometry
  32. GRB 070518: MARGE Observations
  33. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  34. Konus-Wind observation of GRB 070521
  35. GRB070521: Second Epoch Gemini Imaging
  36. GRB070521: NIR observations
  37. GRB070520B: NIR observations
  38. GRB 070521: Swift/UVOT Upper Limits
  39. GRB 070521: Swift-XRT refined analysis
  40. GRB 070521: Keck imaging
  41. GROND upper limits of GRB 070521
  42. GRB 070521 Milagro GeV/TeV Observations
  43. GRB 070521: SARA upper limit
  44. GRB 070521: Subaru observations and possible host detection
  45. GRB070518: Optical/NIR observation
  46. GRB 070520B: Swift/UVOT Upper Limits
  47. GRB 070520A: Subaru Observations
  48. GRB 070521, Swift-BAT refined analysis
  49. GRB 070520A: Swift UVOT Upper Limits
  50. GRB 070520B: Swift-XRT refined analysis
  51. GRB 070521: optical limit by Pi of the Sky
  52. GRB070521: P200 Observations
  53. GRB070521 : Faulkes Telescope North Observations
  54. GRB 070521: TAROT La Silla observatory optical observations
  55. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  56. GRB070521 - SDSS Pre-Burst Observations
  57. GRB 070521: Swift detection of a burst
  58. GRB 070520A: MITSuME Akeno optical upper limits
  59. GRB 070520B, Swift-BAT refined analysis
  60. GRB 070520A, Swift-BAT refined analysis
  61. GRB 070520A: Swift-XRT refined analysis
  62. GRB 070518: TNG observations
  63. GRB 070520B: Swift detection of a burst
  64. GRB 070520: Swift detection of a burst
  65. VLA observation of GRB 070518
  66. GRB 070518: Swift-XRT refined analysis
  67. GRB 070517: Gemini optical imaging
  68. GRB070518: UVOT refined analysis
  69. GRB070518: OSN observation
  70. GRB 070518, Swift-BAT refined analysis
  71. GRB 070518: Swift detection of a burst with optical afterglow
  72. GRB070517: Swift-XRT Refined Analysis
  73. GRB 070517, Swift-BAT refined analysis
  74. GRB 070517: Swift detection of a burst
  75. GRB 070509: objects inside XRT error circle
  76. GRB 070512: IPN localization and Konus spectrum of a bright burst
  77. GRB070419A: optical observations
  78. GRB 070419A, Deep LBT photometry
  79. GRB 070508: pseudo-z from 4 different spectral analyses
  80. GRB 070509: Swift/UVOT Upper Limits
  81. Konus-Wind and Konus-A observation of GRB 070508
  82. Swift-BAT trigger 278987 is not a GRB
  83. GRB 070510: Swift detection of a possible burst
  84. GRB070509: Swift-XRT Refined Analysis
  85. GRB 070508: OA fading and tentative redshift
  86. GRB 070509, Swift-BAT refined analysis
  87. GRB 070508: Suzaku/WAM observation of the prompt emission
  88. GRB 070509: REM observations
  89. GRB 070509: Swift detection of a burst
  90. GRB 070509: ROTSE-III Optical Limits
  91. GRB070508: Swift/UVOT Observations
  92. GRB 070508, SMARTS optical afterglow observation
  93. GRB 070508, Swift-BAT refined analysis
  94. GRB 070508: Multicolor optical observations and possible redshift limit
  95. GRB 070508: Swift-XRT refined analysis
  96. GRB 070508: Optical afterglow detection
  97. GRB 070508: REM observations
  98. GRB 070508: TAROT La Silla observatory optical observations
  99. GRB 070508: Swift detection of an intense burst with an optical counterpart
  100. GRB070412: MAGIC telescope GeV observation

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