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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"

28117 results found.

  1. GRB 070529: SARA upper limit
  2. Swift/UVOT refined analysis of GRB070529
  3. GRB 070529: Optical aterglow from MIRO
  4. GRB 070529: Swift-XRT refined analysis
  5. GRB 070529, Swift-BAT refined analysis
  6. GRB 070529: Xinglong TNT Optical Upper Limit
  7. GRB 070529: Swift detection of a burst with an optical aterglow
  8. GRB 070412: Deep Keck imaging
  9. Swift trigger 280447 is probably a Galactic transient
  10. GRB 070518, deep LBT photometry
  11. Konus-Wind observation of GRB 070521
  12. GRB070521: Second Epoch Gemini Imaging
  13. GRB 070521: Swift/UVOT Upper Limits
  14. GRB 070521, optical observation
  15. GRB 070521: Swift-XRT refined analysis
  16. GRB 070521: Keck imaging
  17. GRB070521: Gemini Observations
  18. GROND upper limits of GRB 070521
  19. GRB 070520B: SARA upper limit
  20. GRB 070520A: SARA upper limit
  21. GRB 070521: SARA upper limit
  22. GRB 070521: Subaru observations and possible host detection
  23. GRB 070520B: Swift/UVOT Upper Limits
  24. GRB 070520A: Subaru Observations
  25. GRB 070521, Swift-BAT refined analysis
  26. GRB 070520A: Swift UVOT Upper Limits
  27. GRB 070520B: Swift-XRT refined analysis
  28. GRB 070521: TAROT La Silla observatory optical observations
  29. GRB070521 - SDSS Pre-Burst Observations
  30. GRB 070521: Swift detection of a burst
  31. GRB 070520A: MITSuME Akeno optical upper limits
  32. GRB 070520B, Swift-BAT refined analysis
  33. GRB 070520A, Swift-BAT refined analysis
  34. GRB 070520A: Swift-XRT refined analysis
  35. GRB 070518: TNG observations
  36. GRB 070520B: Swift detection of a burst
  37. GRB 070520: Xinglong EST optical Upper Limit
  38. GRB 070520: Swift detection of a burst
  39. VLA observation of GRB 070518
  40. GRB 070518: Swift-XRT refined analysis
  41. GRB070518: UVOT refined analysis
  42. GRB 070518, Swift-BAT refined analysis
  43. GRB 070518: OT confirmed form Xinglong TNT observation
  44. GRB 070518: Swift detection of a burst with optical afterglow
  45. GRB070517: Swift-XRT Refined Analysis
  46. GRB 070517, Swift-BAT refined analysis
  47. GRB 070517: Optical search
  48. GRB 070517: Swift detection of a burst
  49. GRB 070509: objects inside XRT error circle
  50. GRB 070512: IPN localization and Konus spectrum of a bright burst
  51. GRB070419A: optical observations
  52. GRB 070509: Swift/UVOT Upper Limits
  53. Konus-Wind and Konus-A observation of GRB 070508
  54. GRB 070510: Swift detection of a possible burst
  55. GRB070509: Swift-XRT Refined Analysis
  56. GRB 070509, Swift-BAT refined analysis
  57. GRB 070508: Suzaku/WAM observation of the prompt emission
  58. GRB 070509: REM observations
  59. GRB070508: Swift/UVOT Observations
  60. GRB 070508, Swift-BAT refined analysis
  61. GRB 070508: REM observations
  62. GRB 070508: TAROT La Silla observatory optical observations
  63. GRB 070508: Swift detection of an intense burst with an optical counterpart
  64. GRB070506: Swift/UVOT Observations
  65. GRB070506: Swift XRT refined analysis
  66. GRB 070506, Swift-BAT Refined Analysis
  67. GRB 070506: Swift detection of a burst with optical afterglow
  68. GRB070429B: VLT observations
  69. GRB070429B: position correction
  70. GRB 070309: Swift-XRT afterglow confirmation
  71. VLA observation of GRB 070429B
  72. Swift/UVOT observations of GRB070429B
  73. GRB 070429B, Swift-BAT refined analysis
  74. Swift/UVOT observations of GRB070429A
  75. GRB 070429A, Swift-BAT refined analysis
  76. GRB 070429A: optical and NIR observations
  77. GRB 070429B: Swift XRT refined analysis
  78. GRB 070429B: ROTSE-III Optical Limits
  79. GRB 070429: ROTSE-III Optical Limits
  80. GRB 070429: Swift detection of a burst
  81. GRB 070427, Swift-BAT Refined Analysis
  82. LT monitoring of GRB070412
  83. GRB 070411: Late-time Keck imaging
  84. GRB070419B: Suzaku WAM observation of the prompt emission
  85. GRB 070420, SMARTS optical/IR afterglow observations
  86. GRB 070411, deep LBT photometry
  87. Konus-Wind observation of GRB 070420
  88. GRB 070411: break in the optical light curve
  89. GRB 070420 Swift-BAT Refined Analysis
  90. GRB 070420: optical rebrightening observed at Mt. John
  91. GRB070420: Swift UVOT continuing observations
  92. GRB 070420: Faulkes Telescope South Observations
  93. GRB 070420: TAROT La Silla observatory optical observations
  94. GRB 070420: NIR and optical afterglow confirmed
  95. GRB 070420: Swift detection of a burst with optical afterglow
  96. GRB 070419A: MITSuME Okayama Observations
  97. GRB 070419A: Early Super-LOTIS Observations
  98. GRB 070419B, Swift-BAT refined analysis
  99. GRB 070419A Swift-BAT Refined Analysis
  100. GRB 070419A, Optical observations

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