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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"

32793 results found.

  1. GRB 070419A, deep LBT photometry and possible supernova detection
  2. GRB070520B: optical observations
  3. GRB070520: optical observation
  4. GRB070518: optical observation
  5. GRB070521: optical observation
  6. Swift/UVOT refined analysis of GRB070531
  7. GRB 070531: Swift-BAT refined analysis
  8. GRB 070531: Swift-XRT position
  9. GRB 070531: Liverpool Telescope Optical Observations
  10. GRB 070529: SARA upper limit
  11. Swift/UVOT refined analysis of GRB070529
  12. GRB 070529: MARGE Observations
  13. GRB 070529: Optical aterglow from MIRO
  14. GRB 070529: Gemini Redshift
  15. GRB 070529: Swift-XRT refined analysis
  16. GRB 070529, Swift-BAT refined analysis
  17. GRB 070529: Xinglong TNT Optical Upper Limit
  18. GRB 070412: Deep Keck imaging
  19. Swift Triggers 280447, 280450 and 280451 are invalid
  20. GRB 070518, deep LBT photometry
  21. GRB 070518: MARGE Observations
  22. Konus-Wind observation of GRB 070521
  23. GRB 070518: optical observation
  24. GRB070521: Second Epoch Gemini Imaging
  25. GRB070521: NIR observations
  26. GRB070520B: NIR observations
  27. GRB 070521: Swift/UVOT Upper Limits
  28. GRB 070521, optical observation
  29. GRB 070521: Swift-XRT refined analysis
  30. GRB 070521: Keck imaging
  31. GRB070521: Gemini Observations
  32. GROND upper limits of GRB 070521
  33. GRB 070521 Milagro GeV/TeV Observations
  34. GRB 070520B: SARA upper limit
  35. GRB 070520A: SARA upper limit
  36. GRB 070521: SARA upper limit
  37. GRB 070521: Subaru observations and possible host detection
  38. GRB070518: Optical/NIR observation
  39. GRB 070520B: Swift/UVOT Upper Limits
  40. GRB 070520A: Subaru Observations
  41. GRB 070521, Swift-BAT refined analysis
  42. GRB 070520A: Swift UVOT Upper Limits
  43. GRB 070520B: Swift-XRT refined analysis
  44. GRB070521: P200 Observations
  45. GRB070521 : Faulkes Telescope North Observations
  46. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  47. GRB 070520A: MITSuME Akeno optical upper limits
  48. GRB 070520B, Swift-BAT refined analysis
  49. GRB 070520A, Swift-BAT refined analysis
  50. GRB 070520A: Swift-XRT refined analysis
  51. GRB 070518: TNG observations
  52. GRB 070520: Xinglong EST optical Upper Limit
  53. VLA observation of GRB 070518
  54. GRB 070518: Swift-XRT refined analysis
  55. GRB 070517: Gemini optical imaging
  56. GRB070518: UVOT refined analysis
  57. GRB 070518, Swift-BAT refined analysis
  58. GRB 070518: OT confirmed form Xinglong TNT observation
  59. GRB070517: Swift-XRT Refined Analysis
  60. GRB 070517, Swift-BAT refined analysis
  61. GRB 070509: objects inside XRT error circle
  62. GRB070419A: optical observations
  63. GRB 070419A, Deep LBT photometry
  64. GRB 070509: Swift/UVOT Upper Limits
  65. Konus-Wind and Konus-A observation of GRB 070508
  66. Swift-BAT trigger 278987 is not a GRB
  67. GRB070509: Swift-XRT Refined Analysis
  68. RHESSI Spectrum of GRB070508
  69. GRB 070508: OA fading and tentative redshift
  70. GRB 070509, Swift-BAT refined analysis
  71. GRB 070508: Suzaku/WAM observation of the prompt emission
  72. GRB 070509: REM observations
  73. GRB 070509: ROTSE-III Optical Limits
  74. GRB070508: Swift/UVOT Observations
  75. GRB 070508, SMARTS optical afterglow observation
  76. GRB 070508, Swift-BAT refined analysis
  77. GRB 070508: Multicolor optical observations and possible redshift limit
  78. GRB 070508: Swift-XRT refined analysis
  79. GRB 070508: Optical observation limiting magnitude
  80. GRB 070508: Optical afterglow detection
  81. GRB 070508: REM observations
  82. GRB070412: MAGIC telescope GeV observation
  83. Swift-BAT trigger 278809 is not a GRB
  84. GRB 070506: VLT redshift
  85. GRB070506: Swift/UVOT Observations
  86. GRB070506: Swift XRT refined analysis
  87. GRB 070506, Swift-BAT Refined Analysis
  88. GRB 070412, deep LBT imaging
  89. GRB 070429A: Swift XRT further analysis
  90. GRB070429B: VLT observations
  91. GRB 070429A: optical observations
  92. GRB070429B: position correction
  93. GRB 070309: Swift-XRT afterglow confirmation
  94. GRB070429B: possible host galaxy detection
  95. VLA observation of GRB 070429B
  96. Swift/UVOT observations of GRB070429B
  97. GRB 070429B, Swift-BAT refined analysis
  98. Swift/UVOT observations of GRB070429A
  99. GRB 070429A: Swift XRT refined analysis
  100. GRB 070429A, Swift-BAT refined analysis

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