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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"

32723 results found.

  1. GRB 070411: Tautenburg RRM Afterglow Confirmation
  2. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  3. GRB 070406: Swift XRT team further analysis
  4. Suzaku ToO observation of SGR 1806-20
  5. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  6. GRB 070406, Swift-BAT refined analysis
  7. GRB 070406: Gemini South Imaging and XRT analysis
  8. GRB070406: Swift UVOT observations
  9. GRB 070406: further analysis of NOT images.
  10. Short GRB 070406 - Possible Bright Host Galaxy
  11. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  12. GRB 070406: NOT observations
  13. GRB 070406: Optical candidate
  14. GRB 070406: photo-z of a bright galaxy in BAT error circle
  15. GRB 070402: Suzaku WAM observation of the prompt emission
  16. GRB 070311, deep optical photometry
  17. Konus-Wind and Konus-A observations of GRB 070402
  18. IPN triangulation of GRB070402 - correction
  19. GRB 070328: Suzaku WAM observation of the prompt emission
  20. INTEGRAL ToO Observation of SGR1806-20
  21. UVOT observations of GRB070330
  22. GRB 070330, Swift-BAT refined analysis
  23. GRB 070330, SMARTS optical/IR observations
  24. GRB 070330: Swift-XRT refined analysis
  25. GRB 070330 - Watcher Observations
  26. Konus-Wind observation of GRB 070328
  27. GRB 070328: Swift/UVOT Upper Limits
  28. long burst from SGR 1806-20 detected on March 26
  29. GRB 070328: Swift/XRT Refined Analysis
  30. GRB 070328 : Suzaku ToO follow up starts
  31. GRB 070328, Swift-BAT refined analysis
  32. GRB070220: optical observations
  33. GRB070208: optical observations
  34. GRB070223: confirmation of nIR and optical afterglow
  35. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  36. GRB 070311, deep optical photometry
  37. Short-Hard GRB 070209: PROMPT Observations
  38. GRB 070318: Gemini + Magellan spectra
  39. GRB 070318: absorption-line redshift
  40. GRB070318: Swift UVOT continuing observations
  41. GRB070318: Swift-XRT refined analysis
  42. GRB 070318: Swift/UVOT Continued Observations
  43. GRB 070318, Swift-BAT refined analysis
  44. GRB 070311: Late Central Engine Activity Optical Flare??
  45. GRB 070311: MDM Optical Monitoring
  46. VLA observation of GRB 070311
  47. GRB 070311: Tautenburg sees afterglow fading
  48. GRB 070311: Optical observation.
  49. GRB 070311: Optical Brightening
  50. GRB 070306: possible emission-line redshift
  51. GRB 070311: SARA upper limit
  52. GRB 070309: variability of the XRT afterglow candidate
  53. GRB 070311: MDM Optical Follow-up
  54. GRB 070311: RAPTOR Detection of Optical Emission
  55. GRB070311: FRAM early follow-up limit
  56. GRB 070311: P60 Observations
  57. GRB 070311: MDM Optical Detection
  58. GRB 070311: Swift/UVOT Upper Limits
  59. GRB 070311: MITSuME Okayama Optical Observation
  60. GRB 070311: Swift-XRT refined analysis
  61. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  62. GRB 070311: REM candidate afterglow
  63. GRB060901: Candidate optical afterglow
  64. GRB070309: Swift/XRT possible afterglow detection
  65. GRB 070125: Chandra X-ray Confirmation of Jet Break
  66. GRB 070309: Swift/UVOT Upper Limits
  67. GRB 070306, optical observation
  68. Swift UVOT Finding Charts for GRB 070309
  69. GRB 070125: X-ray light curve analysis
  70. VLA observation of GRB 070306
  71. GRB 070306: NOT observations
  72. GRB 070306 Swift/UVOT refined analysis
  73. GRB070306: confirmation of near infrared afterglow
  74. GRB 070306: ART-3 early optical and near infrared constraints
  75. GRB 070306, Swift-BAT refined analysis
  76. GRB 070306: XRT Team Refined Analysis
  77. GRB 070306: Optical and IR observations with KANATA
  78. GRB 070223: NIR observations at WHT
  79. GRB070227: Swift-XRT refined analysis
  80. GRB 060605 new redshift
  81. GRB 070125, deep late-time optical observation
  82. VLA observation of GRB 070224
  83. GRB 070223: Optical Observations
  84. GRB 070227: optical observations
  85. GRB 070227: Swift/UVOT Upper Limits
  86. GRB 070227, Swift-BAT refined analysis
  87. GRB070227: possible X-ray afterglow detection
  88. GRB 070224: Optical afterglow confirmation
  89. GRB 070224: Swift/UVOT Upper Limits
  90. GRB070224: Swift-XRT Astrometrically Corrected Position
  91. VLA observation of GRB 070223
  92. VLA observation of GRB 070220
  93. GRB070224: Magellan Imaging Observations
  94. GRB 070224: WHT K-band imaging
  95. GRB 070224: MDM Observations
  96. GRB070224: Gemini Imaging Observations
  97. GRB070224: Swift-XRT Refined Analysis
  98. GRB 070224: optical afterglow candidate
  99. GRB 070224, Swift-BAT refined analysis
  100. GRB 070224: MASTER-Net refind analysis

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