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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"

32740 results found.

  1. GRB 070412 Liverpool Telescope optical limit
  2. GRB 070411: Optical photometry at Crni Vrh
  3. GRB 070412: Swift-XRT refined analysis
  4. GRB 070411: Swift-XRT refined analysis
  5. GRB 070412: further reanalysis of NOT images
  6. GRB 070412: Optical observations at Crni Vrh
  7. GRB 070411: OA redshift
  8. GRB 070412: Swift-XRT refined position
  9. GRB 070412: further NOT observations
  10. GRB 070412: Gemini/GMOS afterglow candidate
  11. GRB 070412: IAC80 optical afterglow candidate
  12. GRB 070412: NOT observations
  13. GRB 070412: Nearby bright galaxy
  14. GRB 070411, Swift-BAT refined analysis
  15. GRB 070411 : Liverpool Telescope Observations
  16. GRB 070411: Optical observations at Crni Vrh
  17. GRB 070411: ROTSE-III Detection of Optical Counterpart
  18. GRB 070411: Tautenburg RRM Afterglow Confirmation
  19. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  20. GRB 070406: Swift XRT team further analysis
  21. Suzaku ToO observation of SGR 1806-20
  22. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  23. GRB 070406, Swift-BAT refined analysis
  24. GRB 070406: Gemini South Imaging and XRT analysis
  25. GRB070406: Swift UVOT observations
  26. GRB 070406: further analysis of NOT images.
  27. Short GRB 070406 - Possible Bright Host Galaxy
  28. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  29. GRB 070406: NOT observations
  30. GRB 070406: Optical candidate
  31. GRB 070406: photo-z of a bright galaxy in BAT error circle
  32. GRB 070402: Suzaku WAM observation of the prompt emission
  33. GRB 070311, deep optical photometry
  34. Konus-Wind and Konus-A observations of GRB 070402
  35. IPN triangulation of GRB070402 - correction
  36. GRB 070328: Suzaku WAM observation of the prompt emission
  37. INTEGRAL ToO Observation of SGR1806-20
  38. UVOT observations of GRB070330
  39. GRB 070330, Swift-BAT refined analysis
  40. GRB 070330, SMARTS optical/IR observations
  41. GRB 070330: Swift-XRT refined analysis
  42. GRB 070330 - Watcher Observations
  43. Konus-Wind observation of GRB 070328
  44. GRB 070328: Swift/UVOT Upper Limits
  45. long burst from SGR 1806-20 detected on March 26
  46. GRB 070328: Swift/XRT Refined Analysis
  47. GRB 070328 : Suzaku ToO follow up starts
  48. GRB 070328, Swift-BAT refined analysis
  49. GRB070220: optical observations
  50. GRB070208: optical observations
  51. GRB070223: confirmation of nIR and optical afterglow
  52. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  53. GRB 070311, deep optical photometry
  54. Short-Hard GRB 070209: PROMPT Observations
  55. GRB 070318: Gemini + Magellan spectra
  56. GRB 070318: absorption-line redshift
  57. GRB070318: Swift UVOT continuing observations
  58. GRB070318: Swift-XRT refined analysis
  59. GRB 070318: Swift/UVOT Continued Observations
  60. GRB 070318, Swift-BAT refined analysis
  61. GRB 070311: Late Central Engine Activity Optical Flare??
  62. GRB 070311: MDM Optical Monitoring
  63. VLA observation of GRB 070311
  64. GRB 070311: Tautenburg sees afterglow fading
  65. GRB 070311: Optical observation.
  66. GRB 070311: Optical Brightening
  67. GRB 070306: possible emission-line redshift
  68. GRB 070311: SARA upper limit
  69. GRB 070309: variability of the XRT afterglow candidate
  70. GRB 070311: MDM Optical Follow-up
  71. GRB 070311: RAPTOR Detection of Optical Emission
  72. GRB070311: FRAM early follow-up limit
  73. GRB 070311: P60 Observations
  74. GRB 070311: MDM Optical Detection
  75. GRB 070311: Swift/UVOT Upper Limits
  76. GRB 070311: MITSuME Okayama Optical Observation
  77. GRB 070311: Swift-XRT refined analysis
  78. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  79. GRB 070311: REM candidate afterglow
  80. GRB060901: Candidate optical afterglow
  81. GRB070309: Swift/XRT possible afterglow detection
  82. GRB 070125: Chandra X-ray Confirmation of Jet Break
  83. GRB 070309: Swift/UVOT Upper Limits
  84. GRB 070306, optical observation
  85. Swift UVOT Finding Charts for GRB 070309
  86. GRB 070125: X-ray light curve analysis
  87. VLA observation of GRB 070306
  88. GRB 070306: NOT observations
  89. GRB 070306 Swift/UVOT refined analysis
  90. GRB070306: confirmation of near infrared afterglow
  91. GRB 070306: ART-3 early optical and near infrared constraints
  92. GRB 070306, Swift-BAT refined analysis
  93. GRB 070306: XRT Team Refined Analysis
  94. GRB 070306: Optical and IR observations with KANATA
  95. GRB 070223: NIR observations at WHT
  96. GRB070227: Swift-XRT refined analysis
  97. GRB 060605 new redshift
  98. GRB 070125, deep late-time optical observation
  99. VLA observation of GRB 070224
  100. GRB 070223: Optical Observations

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