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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"

37566 results found.

  1. GRB 070529: Optical aterglow from MIRO
  2. GRB 070529: Gemini Redshift
  3. GRB 070529: Swift-XRT refined analysis
  4. GRB 070529, Swift-BAT refined analysis
  5. GRB 070529: Xinglong TNT Optical Upper Limit
  6. GRB 070529: Swift detection of a burst with an optical aterglow
  7. GRB 070412: Deep Keck imaging
  8. Swift trigger 280447 is probably a Galactic transient
  9. GRB 070518, deep LBT photometry
  10. GRB 070518: MARGE Observations
  11. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  12. Konus-Wind observation of GRB 070521
  13. GRB 070518: optical observation
  14. GRB070520B: NIR observations
  15. GRB 070521: Swift/UVOT Upper Limits
  16. GRB 070521, optical observation
  17. GRB 070521: Swift-XRT refined analysis
  18. GRB 070521: Keck imaging
  19. GROND upper limits of GRB 070521
  20. GRB 070521 Milagro GeV/TeV Observations
  21. GRB 070520B: SARA upper limit
  22. GRB 070520A: SARA upper limit
  23. GRB 070521: SARA upper limit
  24. GRB 070521: Subaru observations and possible host detection
  25. GRB 070520B: Swift/UVOT Upper Limits
  26. GRB 070520A: Subaru Observations
  27. GRB 070521, Swift-BAT refined analysis
  28. GRB 070520A: Swift UVOT Upper Limits
  29. GRB 070520B: Swift-XRT refined analysis
  30. GRB 070521: optical limit by Pi of the Sky
  31. GRB070521 : Faulkes Telescope North Observations
  32. GRB 070521: TAROT La Silla observatory optical observations
  33. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  34. GRB070521 - SDSS Pre-Burst Observations
  35. GRB 070521: Swift detection of a burst
  36. GRB 070520A: MITSuME Akeno optical upper limits
  37. GRB 070520B, Swift-BAT refined analysis
  38. GRB 070520A, Swift-BAT refined analysis
  39. GRB 070520A: Swift-XRT refined analysis
  40. GRB 070518: TNG observations
  41. GRB 070520B: Swift detection of a burst
  42. GRB 070520: Xinglong EST optical Upper Limit
  43. GRB 070520: Swift detection of a burst
  44. VLA observation of GRB 070518
  45. GRB 070518: Swift-XRT refined analysis
  46. GRB 070517: Gemini optical imaging
  47. GRB070518: OSN observation
  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. GRB 070517, Swift-BAT refined analysis
  52. GRB 070517: Optical search
  53. GRB 070517: Swift detection of a burst
  54. GRB 070509: objects inside XRT error circle
  55. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  56. GRB 070512: IPN localization and Konus spectrum of a bright burst
  57. GRB070419A: optical observations
  58. GRB 070419A, Deep LBT photometry
  59. GRB 070508: pseudo-z from 4 different spectral analyses
  60. GRB 070509: Swift/UVOT Upper Limits
  61. Konus-Wind and Konus-A observation of GRB 070508
  62. Swift-BAT trigger 278987 is not a GRB
  63. GRB 070510: Swift detection of a possible burst
  64. GRB070509: Swift-XRT Refined Analysis
  65. GRB 070508: OA fading and tentative redshift
  66. GRB 070509, Swift-BAT refined analysis
  67. GRB 070508: Suzaku/WAM observation of the prompt emission
  68. GRB 070509: REM observations
  69. GRB 070509: Swift detection of a burst
  70. GRB 070509: ROTSE-III Optical Limits
  71. GRB070508: Swift/UVOT Observations
  72. GRB 070508, SMARTS optical afterglow observation
  73. GRB 070508, Swift-BAT refined analysis
  74. GRB 070508: Multicolor optical observations and possible redshift limit
  75. GRB 070508: Swift-XRT refined analysis
  76. GRB 070508: Optical observation limiting magnitude
  77. GRB 070508: Optical afterglow detection
  78. GRB 070508: REM observations
  79. GRB 070508: TAROT La Silla observatory optical observations
  80. GRB 070508: Swift detection of an intense burst with an optical counterpart
  81. Swift-BAT trigger 278809 is not a GRB
  82. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  83. GRB 070506: VLT redshift
  84. GRB070506: Swift XRT refined analysis
  85. GRB 070506, Swift-BAT Refined Analysis
  86. GRB 070506: Swift detection of a burst with optical afterglow
  87. GRB 070412, deep LBT imaging
  88. GRB 070429A: Swift XRT further analysis
  89. GRB070429B: VLT observations
  90. GRB 070429A: optical observations
  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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