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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"

45567 results found.

  1. Konus-Wind observation of GRB 070521
  2. GRB 070518: optical observation
  3. GRB070521: Second Epoch Gemini Imaging
  4. GRB070521: NIR observations
  5. GRB070520B: NIR observations
  6. GRB 070521: Swift/UVOT Upper Limits
  7. GRB 070521, optical observation
  8. GRB 070521: Swift-XRT refined analysis
  9. GRB 070521: Keck imaging
  10. GRB070521: Gemini Observations
  11. GROND upper limits of GRB 070521
  12. GRB 070521 Milagro GeV/TeV Observations
  13. GRB 070520B: SARA upper limit
  14. GRB 070520A: SARA upper limit
  15. GRB 070521: SARA upper limit
  16. GRB 070521: Subaru observations and possible host detection
  17. GRB070518: Optical/NIR observation
  18. GRB 070520B: Swift/UVOT Upper Limits
  19. GRB 070520A: Subaru Observations
  20. GRB 070521, Swift-BAT refined analysis
  21. GRB 070520A: Swift UVOT Upper Limits
  22. GRB 070520B: Swift-XRT refined analysis
  23. GRB 070521: optical limit by Pi of the Sky
  24. GRB070521: P200 Observations
  25. GRB070521 : Faulkes Telescope North Observations
  26. GRB 070521: TAROT La Silla observatory optical observations
  27. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  28. GRB070521 - SDSS Pre-Burst Observations
  29. GRB 070521: Swift detection of a burst
  30. GRB 070520A: MITSuME Akeno optical upper limits
  31. GRB 070520B, Swift-BAT refined analysis
  32. GRB 070520A, Swift-BAT refined analysis
  33. GRB 070520A: Swift-XRT refined analysis
  34. GRB 070518: TNG observations
  35. GRB 070520B: Swift detection of a burst
  36. GRB 070520: Xinglong EST optical Upper Limit
  37. GRB 070520: Swift detection of a burst
  38. VLA observation of GRB 070518
  39. GRB 070518: Swift-XRT refined analysis
  40. GRB 070517: Gemini optical imaging
  41. GRB070518: UVOT refined analysis
  42. GRB070518: OSN observation
  43. GRB 070518, Swift-BAT refined analysis
  44. GRB 070518: OT confirmed form Xinglong TNT observation
  45. GRB 070518: Swift detection of a burst with optical afterglow
  46. GRB070517: Swift-XRT Refined Analysis
  47. GRB 070517, Swift-BAT refined analysis
  48. GRB 070517: Optical search
  49. GRB 070517: Swift detection of a burst
  50. GRB 070509: objects inside XRT error circle
  51. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  52. GRB 070512: IPN localization and Konus spectrum of a bright burst
  53. GRB070419A: optical observations
  54. GRB 070419A, Deep LBT photometry
  55. GRB 070508: pseudo-z from 4 different spectral analyses
  56. GRB 070509: Swift/UVOT Upper Limits
  57. Konus-Wind and Konus-A observation of GRB 070508
  58. Swift-BAT trigger 278987 is not a GRB
  59. GRB 070510: Swift detection of a possible burst
  60. GRB070509: Swift-XRT Refined Analysis
  61. RHESSI Spectrum of GRB070508
  62. GRB 070508: OA fading and tentative redshift
  63. GRB 070509, Swift-BAT refined analysis
  64. GRB 070508: Suzaku/WAM observation of the prompt emission
  65. GRB 070509: REM observations
  66. GRB 070509: Swift detection of a burst
  67. GRB 070509: ROTSE-III Optical Limits
  68. GRB070508: Swift/UVOT Observations
  69. GRB 070508, SMARTS optical afterglow observation
  70. GRB 070508, Swift-BAT refined analysis
  71. GRB 070508: Multicolor optical observations and possible redshift limit
  72. GRB 070508: Swift-XRT refined analysis
  73. GRB 070508: Optical observation limiting magnitude
  74. GRB 070508: Optical afterglow detection
  75. GRB 070508: REM observations
  76. GRB 070508: TAROT La Silla observatory optical observations
  77. GRB 070508: Swift detection of an intense burst with an optical counterpart
  78. GRB070412: MAGIC telescope GeV observation
  79. Swift-BAT trigger 278809 is not a GRB
  80. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  81. GRB 070506: VLT redshift
  82. GRB070506: Swift/UVOT Observations
  83. GRB070506: Swift XRT refined analysis
  84. GRB 070506, Swift-BAT Refined Analysis
  85. GRB 070506: Swift detection of a burst with optical afterglow
  86. GRB 070412, deep LBT imaging
  87. GRB 070429A: Swift XRT further analysis
  88. GRB070429B: VLT observations
  89. GRB 070429A: optical observations
  90. GRB070429B: position correction
  91. GRB 070309: Swift-XRT afterglow confirmation
  92. GRB070429B: possible host galaxy detection
  93. VLA observation of GRB 070429B
  94. Swift/UVOT observations of GRB070429B
  95. GRB 070429B, Swift-BAT refined analysis
  96. Swift/UVOT observations of GRB070429A
  97. GRB 070429A: Swift XRT refined analysis
  98. GRB 070429A, Swift-BAT refined analysis
  99. GRB 070429A: optical and NIR observations
  100. GRB 070429B: Swift XRT refined analysis

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