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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"

28226 results found.

  1. GRB 070411: TAROT Calern observatory optical observations
  2. GRB070520B: optical observations
  3. GRB070520: optical observation
  4. GRB070518: optical observation
  5. GRB070521: optical observation
  6. GRB 070531: NOT nIR observations
  7. GRB 070531: Swift-BAT refined analysis
  8. GRB 070531: I-band observations from IAC80
  9. GRB 070531: Liverpool Telescope Optical Observations
  10. GRB 070529: SARA upper limit
  11. Swift/UVOT refined analysis of GRB070529
  12. GRB 070529: Optical aterglow from MIRO
  13. GRB 070529: Swift-XRT refined analysis
  14. GRB 070529, Swift-BAT refined analysis
  15. GRB 070529: Xinglong TNT Optical Upper Limit
  16. GRB 070529: Swift detection of a burst with an optical aterglow
  17. GRB 070412: Deep Keck imaging
  18. Swift trigger 280447 is probably a Galactic transient
  19. GRB 070518, deep LBT photometry
  20. Konus-Wind observation of GRB 070521
  21. GRB070521: Second Epoch Gemini Imaging
  22. GRB 070521: Swift/UVOT Upper Limits
  23. GRB 070521, optical observation
  24. GRB 070521: Swift-XRT refined analysis
  25. GRB 070521: Keck imaging
  26. GRB070521: Gemini Observations
  27. GROND upper limits of GRB 070521
  28. GRB 070520B: SARA upper limit
  29. GRB 070520A: SARA upper limit
  30. GRB 070521: SARA upper limit
  31. GRB 070521: Subaru observations and possible host detection
  32. GRB 070520B: Swift/UVOT Upper Limits
  33. GRB 070520A: Subaru Observations
  34. GRB 070521, Swift-BAT refined analysis
  35. GRB 070520A: Swift UVOT Upper Limits
  36. GRB 070520B: Swift-XRT refined analysis
  37. GRB 070521: TAROT La Silla observatory optical observations
  38. GRB070521 - SDSS Pre-Burst Observations
  39. GRB 070521: Swift detection of a burst
  40. GRB 070520A: MITSuME Akeno optical upper limits
  41. GRB 070520B, Swift-BAT refined analysis
  42. GRB 070520A, Swift-BAT refined analysis
  43. GRB 070520A: Swift-XRT refined analysis
  44. GRB 070518: TNG observations
  45. GRB 070520B: Swift detection of a burst
  46. GRB 070520: Xinglong EST optical Upper Limit
  47. GRB 070520: Swift detection of a burst
  48. VLA observation of GRB 070518
  49. GRB 070518: Swift-XRT refined analysis
  50. GRB070518: UVOT refined analysis
  51. GRB 070518, Swift-BAT refined analysis
  52. GRB 070518: OT confirmed form Xinglong TNT observation
  53. GRB 070518: Swift detection of a burst with optical afterglow
  54. GRB070517: Swift-XRT Refined Analysis
  55. GRB 070517, Swift-BAT refined analysis
  56. GRB 070517: Optical search
  57. GRB 070517: Swift detection of a burst
  58. GRB 070509: objects inside XRT error circle
  59. GRB 070512: IPN localization and Konus spectrum of a bright burst
  60. GRB070419A: optical observations
  61. GRB 070509: Swift/UVOT Upper Limits
  62. Konus-Wind and Konus-A observation of GRB 070508
  63. GRB 070510: Swift detection of a possible burst
  64. GRB070509: Swift-XRT Refined Analysis
  65. GRB 070509, Swift-BAT refined analysis
  66. GRB 070508: Suzaku/WAM observation of the prompt emission
  67. GRB 070509: REM observations
  68. GRB070508: Swift/UVOT Observations
  69. GRB 070508, Swift-BAT refined analysis
  70. GRB 070508: REM observations
  71. GRB 070508: TAROT La Silla observatory optical observations
  72. GRB 070508: Swift detection of an intense burst with an optical counterpart
  73. GRB070506: Swift/UVOT Observations
  74. GRB070506: Swift XRT refined analysis
  75. GRB 070506, Swift-BAT Refined Analysis
  76. GRB 070506: Swift detection of a burst with optical afterglow
  77. GRB070429B: VLT observations
  78. GRB070429B: position correction
  79. GRB 070309: Swift-XRT afterglow confirmation
  80. VLA observation of GRB 070429B
  81. Swift/UVOT observations of GRB070429B
  82. GRB 070429B, Swift-BAT refined analysis
  83. Swift/UVOT observations of GRB070429A
  84. GRB 070429A, Swift-BAT refined analysis
  85. GRB 070429A: optical and NIR observations
  86. GRB 070429B: Swift XRT refined analysis
  87. GRB 070429B: ROTSE-III Optical Limits
  88. GRB 070429: ROTSE-III Optical Limits
  89. GRB 070429: Swift detection of a burst
  90. GRB 070427, Swift-BAT Refined Analysis
  91. LT monitoring of GRB070412
  92. GRB 070411: Late-time Keck imaging
  93. GRB070419B: Suzaku WAM observation of the prompt emission
  94. GRB 070420, SMARTS optical/IR afterglow observations
  95. GRB 070411, deep LBT photometry
  96. Konus-Wind observation of GRB 070420
  97. GRB 070411: break in the optical light curve
  98. GRB 070420 Swift-BAT Refined Analysis
  99. GRB 070420: optical rebrightening observed at Mt. John
  100. GRB070420: Swift UVOT continuing observations

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