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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"

21470 results found.

  1. Konus-Wind observation of GRB 070521
  2. GRB070521: Second Epoch Gemini Imaging
  3. GRB070521: NIR observations
  4. GRB070520B: NIR observations
  5. GRB 070521: Swift/UVOT Upper Limits
  6. GRB 070521: Swift-XRT refined analysis
  7. GRB 070521: Keck imaging
  8. GROND upper limits of GRB 070521
  9. GRB 070521 Milagro GeV/TeV Observations
  10. GRB 070521: SARA upper limit
  11. GRB 070521: Subaru observations and possible host detection
  12. GRB 070520B: Swift/UVOT Upper Limits
  13. GRB 070520A: Subaru Observations
  14. GRB 070521, Swift-BAT refined analysis
  15. GRB 070520A: Swift UVOT Upper Limits
  16. GRB 070520B: Swift-XRT refined analysis
  17. GRB 070521: optical limit by Pi of the Sky
  18. GRB070521: P200 Observations
  19. GRB070521 : Faulkes Telescope North Observations
  20. GRB 070521: TAROT La Silla observatory optical observations
  21. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  22. GRB070521 - SDSS Pre-Burst Observations
  23. GRB 070521: Swift detection of a burst
  24. GRB 070520A: MITSuME Akeno optical upper limits
  25. GRB 070520B, Swift-BAT refined analysis
  26. GRB 070520A, Swift-BAT refined analysis
  27. GRB 070520A: Swift-XRT refined analysis
  28. GRB 070520B: Swift detection of a burst
  29. GRB 070520: Swift detection of a burst
  30. VLA observation of GRB 070518
  31. GRB 070518: Swift-XRT refined analysis
  32. GRB 070517: Gemini optical imaging
  33. GRB070518: UVOT refined analysis
  34. GRB 070518, Swift-BAT refined analysis
  35. GRB 070518: Swift detection of a burst with optical afterglow
  36. GRB070517: Swift-XRT Refined Analysis
  37. GRB 070517, Swift-BAT refined analysis
  38. GRB 070517: Swift detection of a burst
  39. GRB 070509: objects inside XRT error circle
  40. GRB 070512: IPN localization and Konus spectrum of a bright burst
  41. GRB 070508: pseudo-z from 4 different spectral analyses
  42. GRB 070509: Swift/UVOT Upper Limits
  43. Konus-Wind and Konus-A observation of GRB 070508
  44. Swift-BAT trigger 278987 is not a GRB
  45. GRB 070510: Swift detection of a possible burst
  46. GRB070509: Swift-XRT Refined Analysis
  47. GRB 070509, Swift-BAT refined analysis
  48. GRB 070508: Suzaku/WAM observation of the prompt emission
  49. GRB 070509: REM observations
  50. GRB 070509: Swift detection of a burst
  51. GRB 070509: ROTSE-III Optical Limits
  52. GRB070508: Swift/UVOT Observations
  53. GRB 070508, Swift-BAT refined analysis
  54. GRB 070508: Swift-XRT refined analysis
  55. GRB 070508: Optical afterglow detection
  56. GRB 070508: TAROT La Silla observatory optical observations
  57. GRB 070508: Swift detection of an intense burst with an optical counterpart
  58. GRB070412: MAGIC telescope GeV observation
  59. Swift-BAT trigger 278809 is not a GRB
  60. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  61. GRB070506: Swift/UVOT Observations
  62. GRB070506: Swift XRT refined analysis
  63. GRB 070506, Swift-BAT Refined Analysis
  64. GRB 070506: Swift detection of a burst with optical afterglow
  65. GRB 070412, deep LBT imaging
  66. GRB 070429A: Swift XRT further analysis
  67. GRB070429B: VLT observations
  68. GRB 070429A: optical observations
  69. GRB070429B: position correction
  70. GRB 070309: Swift-XRT afterglow confirmation
  71. GRB070429B: possible host galaxy detection
  72. VLA observation of GRB 070429B
  73. Swift/UVOT observations of GRB070429B
  74. GRB 070429B, Swift-BAT refined analysis
  75. Swift/UVOT observations of GRB070429A
  76. GRB 070429A: Swift XRT refined analysis
  77. GRB 070429A, Swift-BAT refined analysis
  78. GRB 070429A: optical and NIR observations
  79. GRB 070429B: Swift XRT refined analysis
  80. GRB 070429B: ROTSE-III Optical Limits
  81. GRB 070429B: Swift detection of a short burst
  82. GRB 070429: ROTSE-III Optical Limits
  83. GRB 070429: Swift detection of a burst
  84. GRB 070427, Swift-BAT Refined Analysis
  85. GRB 070427: Swift detection of a burst
  86. GRB070419B: Suzaku WAM observation of the prompt emission
  87. GRB 070411, deep LBT photometry
  88. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  89. GRB 070420 Swift-BAT Refined Analysis
  90. GRB070419A: Kuiper Optical detection
  91. GRB070419a: Swift UVOT observations
  92. GRB 070419A: MARGE Observations
  93. GRB 070420: optical rebrightening observed at Mt. John
  94. GRB 070420: Swift XRT refined analysis
  95. GRB070420: Swift UVOT continuing observations
  96. GRB 070420: Faulkes Telescope South Observations
  97. GBR 070419A: Swift/XRT refined analysis
  98. GRB 070420: TAROT La Silla observatory optical observations
  99. GRB 070420: NIR and optical afterglow confirmed
  100. GRB 070420: Swift detection of a burst with optical afterglow

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