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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"

38679 results found.

  1. GRB 070521: Swift/UVOT Upper Limits
  2. GRB 070521, optical observation
  3. GRB 070521: Swift-XRT refined analysis
  4. GRB070521: Gemini Observations
  5. GRB 070521 Milagro GeV/TeV Observations
  6. GRB 070520B: SARA upper limit
  7. GRB 070520A: SARA upper limit
  8. GRB 070521: SARA upper limit
  9. GRB 070521: Subaru observations and possible host detection
  10. GRB070518: Optical/NIR observation
  11. GRB 070520B: Swift/UVOT Upper Limits
  12. GRB 070520A: Subaru Observations
  13. GRB 070521, Swift-BAT refined analysis
  14. GRB 070520A: Swift UVOT Upper Limits
  15. GRB 070520B: Swift-XRT refined analysis
  16. GRB 070521: optical limit by Pi of the Sky
  17. GRB070521: P200 Observations
  18. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  19. GRB070521 - SDSS Pre-Burst Observations
  20. GRB 070521: Swift detection of a burst
  21. GRB 070520A: MITSuME Akeno optical upper limits
  22. GRB 070520B, Swift-BAT refined analysis
  23. GRB 070520A, Swift-BAT refined analysis
  24. GRB 070520A: Swift-XRT refined analysis
  25. GRB 070518: TNG observations
  26. GRB 070520B: Swift detection of a burst
  27. GRB 070520: Xinglong EST optical Upper Limit
  28. GRB 070520: Swift detection of a burst
  29. VLA observation of GRB 070518
  30. GRB 070518: Swift-XRT refined analysis
  31. GRB 070517: Gemini optical imaging
  32. GRB070518: UVOT refined analysis
  33. GRB070518: OSN observation
  34. GRB 070518, Swift-BAT refined analysis
  35. GRB 070518: OT confirmed form Xinglong TNT observation
  36. GRB 070518: Swift detection of a burst with optical afterglow
  37. GRB070517: Swift-XRT Refined Analysis
  38. GRB 070517, Swift-BAT refined analysis
  39. GRB 070517: Optical search
  40. GRB 070517: Swift detection of a burst
  41. GRB 070509: objects inside XRT error circle
  42. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  43. GRB 070512: IPN localization and Konus spectrum of a bright burst
  44. GRB070419A: optical observations
  45. GRB 070419A, Deep LBT photometry
  46. GRB 070508: pseudo-z from 4 different spectral analyses
  47. GRB 070509: Swift/UVOT Upper Limits
  48. Konus-Wind and Konus-A observation of GRB 070508
  49. Swift-BAT trigger 278987 is not a GRB
  50. GRB 070510: Swift detection of a possible burst
  51. GRB070509: Swift-XRT Refined Analysis
  52. RHESSI Spectrum of GRB070508
  53. GRB 070508: OA fading and tentative redshift
  54. GRB 070509, Swift-BAT refined analysis
  55. GRB 070509: REM observations
  56. GRB 070509: Swift detection of a burst
  57. GRB 070509: ROTSE-III Optical Limits
  58. GRB070508: Swift/UVOT Observations
  59. GRB 070508, SMARTS optical afterglow observation
  60. GRB 070508, Swift-BAT refined analysis
  61. GRB 070508: Multicolor optical observations and possible redshift limit
  62. GRB 070508: Swift-XRT refined analysis
  63. GRB 070508: Optical observation limiting magnitude
  64. GRB 070508: Optical afterglow detection
  65. GRB 070508: REM observations
  66. GRB 070508: Swift detection of an intense burst with an optical counterpart
  67. GRB070412: MAGIC telescope GeV observation
  68. Swift-BAT trigger 278809 is not a GRB
  69. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  70. GRB 070506: VLT redshift
  71. GRB070506: Swift/UVOT Observations
  72. GRB070506: Swift XRT refined analysis
  73. GRB 070506, Swift-BAT Refined Analysis
  74. GRB 070506: Swift detection of a burst with optical afterglow
  75. GRB 070412, deep LBT imaging
  76. GRB 070429A: Swift XRT further analysis
  77. GRB070429B: VLT observations
  78. GRB 070429A: optical observations
  79. GRB070429B: position correction
  80. GRB 070309: Swift-XRT afterglow confirmation
  81. GRB070429B: possible host galaxy detection
  82. VLA observation of GRB 070429B
  83. Swift/UVOT observations of GRB070429B
  84. GRB 070429B, Swift-BAT refined analysis
  85. Swift/UVOT observations of GRB070429A
  86. GRB 070429A: Swift XRT refined analysis
  87. GRB 070429A, Swift-BAT refined analysis
  88. GRB 070429B: Swift XRT refined analysis
  89. GRB 070429B: ROTSE-III Optical Limits
  90. GRB 070429B: Swift detection of a short burst
  91. GRB 070429: What's the temperature?
  92. GRB 070429: ROTSE-III Optical Limits
  93. GRB 070429: Swift detection of a burst
  94. GRB 070427, Swift-BAT Refined Analysis
  95. GRB 070427: Swift detection of a burst
  96. GRB 070411, further deep LBT photometry
  97. GRB 070411: Late-time Keck imaging
  98. GRB 070411 : Planned XMM-Newton observation
  99. GRB 070420, SMARTS optical/IR afterglow observations
  100. GRB 070411, deep LBT photometry

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