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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"

32550 results found.

  1. GRB 070419 optical afterglow candidate
  2. GRB 070419A: ROTSE-III Optical Limits
  3. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  4. GRB 070418: Optical and IR observations with KANATA
  5. GRB 070406: Swift XRT refined analysis
  6. GRB 070318, SMARTS optical/IR afterglow observations
  7. GRB 070411: TLS data shows plateau, flares
  8. GRB070412: Swift UVOT observations
  9. GRB 070411: Swift/UVOT observations
  10. GRB 070412, Swift-BAT refined analysis
  11. GRB 070412 Liverpool Telescope optical limit
  12. GRB 070411: Optical photometry at Crni Vrh
  13. GRB 070412: Swift-XRT refined analysis
  14. GRB 070411: Swift-XRT refined analysis
  15. GRB 070412: further reanalysis of NOT images
  16. GRB 070412: Optical observations at Crni Vrh
  17. GRB 070411: OA redshift
  18. GRB 070412: Swift-XRT refined position
  19. GRB 070412: further NOT observations
  20. GRB 070412: Gemini/GMOS afterglow candidate
  21. GRB 070412: IAC80 optical afterglow candidate
  22. GRB 070412: NOT observations
  23. GRB 070412: Nearby bright galaxy
  24. GRB 070411, Swift-BAT refined analysis
  25. GRB 070411 : Liverpool Telescope Observations
  26. GRB 070411: Optical observations at Crni Vrh
  27. GRB 070411: ROTSE-III Detection of Optical Counterpart
  28. GRB 070411: Tautenburg RRM Afterglow Confirmation
  29. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  30. GRB 070406: Swift XRT team further analysis
  31. Suzaku ToO observation of SGR 1806-20
  32. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  33. GRB 070406, Swift-BAT refined analysis
  34. GRB 070406: Gemini South Imaging and XRT analysis
  35. GRB070406: Swift UVOT observations
  36. GRB 070406: further analysis of NOT images.
  37. Short GRB 070406 - Possible Bright Host Galaxy
  38. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  39. GRB 070406: NOT observations
  40. GRB 070406: Optical candidate
  41. GRB 070406: photo-z of a bright galaxy in BAT error circle
  42. GRB 070402: Suzaku WAM observation of the prompt emission
  43. GRB 070311, deep optical photometry
  44. Konus-Wind and Konus-A observations of GRB 070402
  45. IPN triangulation of GRB070402 - correction
  46. GRB 070328: Suzaku WAM observation of the prompt emission
  47. INTEGRAL ToO Observation of SGR1806-20
  48. UVOT observations of GRB070330
  49. GRB 070330, Swift-BAT refined analysis
  50. GRB 070330, SMARTS optical/IR observations
  51. GRB 070330: Swift-XRT refined analysis
  52. GRB 070330 - Watcher Observations
  53. Konus-Wind observation of GRB 070328
  54. GRB 070328: Swift/UVOT Upper Limits
  55. long burst from SGR 1806-20 detected on March 26
  56. GRB 070328: Swift/XRT Refined Analysis
  57. GRB 070328 : Suzaku ToO follow up starts
  58. GRB 070328, Swift-BAT refined analysis
  59. GRB070220: optical observations
  60. GRB070208: optical observations
  61. GRB070223: confirmation of nIR and optical afterglow
  62. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  63. GRB 070311, deep optical photometry
  64. Short-Hard GRB 070209: PROMPT Observations
  65. GRB 070318: Gemini + Magellan spectra
  66. GRB 070318: absorption-line redshift
  67. GRB070318: Swift UVOT continuing observations
  68. GRB070318: Swift-XRT refined analysis
  69. GRB 070318: Swift/UVOT Continued Observations
  70. GRB 070318, Swift-BAT refined analysis
  71. GRB 070311: Late Central Engine Activity Optical Flare??
  72. GRB 070311: MDM Optical Monitoring
  73. VLA observation of GRB 070311
  74. GRB 070311: Tautenburg sees afterglow fading
  75. GRB 070311: Optical observation.
  76. GRB 070311: Optical Brightening
  77. GRB 070306: possible emission-line redshift
  78. GRB 070311: SARA upper limit
  79. GRB 070309: variability of the XRT afterglow candidate
  80. GRB 070311: MDM Optical Follow-up
  81. GRB 070311: RAPTOR Detection of Optical Emission
  82. GRB070311: FRAM early follow-up limit
  83. GRB 070311: P60 Observations
  84. GRB 070311: MDM Optical Detection
  85. GRB 070311: Swift/UVOT Upper Limits
  86. GRB 070311: MITSuME Okayama Optical Observation
  87. GRB 070311: Swift-XRT refined analysis
  88. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  89. GRB 070311: REM candidate afterglow
  90. GRB060901: Candidate optical afterglow
  91. GRB070309: Swift/XRT possible afterglow detection
  92. GRB 070125: Chandra X-ray Confirmation of Jet Break
  93. GRB 070309: Swift/UVOT Upper Limits
  94. GRB 070306, optical observation
  95. Swift UVOT Finding Charts for GRB 070309
  96. GRB 070125: X-ray light curve analysis
  97. VLA observation of GRB 070306
  98. GRB 070306: NOT observations
  99. GRB 070306 Swift/UVOT refined analysis
  100. GRB070306: confirmation of near infrared afterglow

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