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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"

28123 results found.

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

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