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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"

32771 results found.

  1. GRB 070420: NIR and optical afterglow confirmed
  2. GRB 070419A: MITSuME Okayama Observations
  3. GRB 070419A: Early Super-LOTIS Observations
  4. GRB 070419B, Swift-BAT refined analysis
  5. GRB 070419A Swift-BAT Refined Analysis
  6. GRB070419B: Confirmation of Optical Transient
  7. GRB 070419A: RAPTOR Detection of Early Emission
  8. GRB 070419B: Swift XRT refined analysis
  9. GRB 070419: Keck/LRIS Absorption Redshift
  10. GRB 070419A, Optical observations
  11. GRB 070411: Deep VLT detection
  12. GRB 070419A: SARA observations
  13. GRB 070419A: NAYUTA Optical Observation
  14. GRB 070419A: Faulkes Telescope North Optical Observations
  15. GRB 070419B optical afterglow candidate
  16. GRB 070419A: Optical and IR observations with KANATA
  17. GRB 070419B: optical afterglow candidate
  18. GRB070419A, optical observation
  19. Infrared detection of GRB070419A with UKIRT
  20. GRB070330: Correction to UVOT position
  21. GRB 070419: P60 Confirmation of Optical Afterglow
  22. GRB 070419 optical afterglow candidate
  23. GRB 070419A: ROTSE-III Optical Limits
  24. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  25. GRB 070418: Optical and IR observations with KANATA
  26. GRB 070406: Swift XRT refined analysis
  27. GRB 070318, SMARTS optical/IR afterglow observations
  28. GRB 070411: TLS data shows plateau, flares
  29. GRB070412: Swift UVOT observations
  30. GRB 070411: Swift/UVOT observations
  31. GRB 070412, Swift-BAT refined analysis
  32. GRB 070412 Liverpool Telescope optical limit
  33. GRB 070411: Optical photometry at Crni Vrh
  34. GRB 070412: Swift-XRT refined analysis
  35. GRB 070411: Swift-XRT refined analysis
  36. GRB 070412: further reanalysis of NOT images
  37. GRB 070412: Optical observations at Crni Vrh
  38. GRB 070411: OA redshift
  39. GRB 070412: Swift-XRT refined position
  40. GRB 070412: further NOT observations
  41. GRB 070412: Gemini/GMOS afterglow candidate
  42. GRB 070412: IAC80 optical afterglow candidate
  43. GRB 070412: NOT observations
  44. GRB 070412: Nearby bright galaxy
  45. GRB 070411, Swift-BAT refined analysis
  46. GRB 070411 : Liverpool Telescope Observations
  47. GRB 070411: Optical observations at Crni Vrh
  48. GRB 070411: ROTSE-III Detection of Optical Counterpart
  49. GRB 070411: Tautenburg RRM Afterglow Confirmation
  50. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  51. GRB 070406: Swift XRT team further analysis
  52. Suzaku ToO observation of SGR 1806-20
  53. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  54. GRB 070406, Swift-BAT refined analysis
  55. GRB 070406: Gemini South Imaging and XRT analysis
  56. GRB070406: Swift UVOT observations
  57. GRB 070406: further analysis of NOT images.
  58. Short GRB 070406 - Possible Bright Host Galaxy
  59. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  60. GRB 070406: NOT observations
  61. GRB 070406: Optical candidate
  62. GRB 070406: photo-z of a bright galaxy in BAT error circle
  63. GRB 070402: Suzaku WAM observation of the prompt emission
  64. GRB 070311, deep optical photometry
  65. Konus-Wind and Konus-A observations of GRB 070402
  66. IPN triangulation of GRB070402 - correction
  67. GRB 070328: Suzaku WAM observation of the prompt emission
  68. INTEGRAL ToO Observation of SGR1806-20
  69. UVOT observations of GRB070330
  70. GRB 070330, Swift-BAT refined analysis
  71. GRB 070330, SMARTS optical/IR observations
  72. GRB 070330: Swift-XRT refined analysis
  73. GRB 070330 - Watcher Observations
  74. Konus-Wind observation of GRB 070328
  75. GRB 070328: Swift/UVOT Upper Limits
  76. long burst from SGR 1806-20 detected on March 26
  77. GRB 070328: Swift/XRT Refined Analysis
  78. GRB 070328 : Suzaku ToO follow up starts
  79. GRB 070328, Swift-BAT refined analysis
  80. GRB070220: optical observations
  81. GRB070208: optical observations
  82. GRB070223: confirmation of nIR and optical afterglow
  83. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  84. GRB 070311, deep optical photometry
  85. Short-Hard GRB 070209: PROMPT Observations
  86. GRB 070318: Gemini + Magellan spectra
  87. GRB 070318: absorption-line redshift
  88. GRB070318: Swift UVOT continuing observations
  89. GRB070318: Swift-XRT refined analysis
  90. GRB 070318: Swift/UVOT Continued Observations
  91. GRB 070318, Swift-BAT refined analysis
  92. GRB 070311: Late Central Engine Activity Optical Flare??
  93. GRB 070311: MDM Optical Monitoring
  94. VLA observation of GRB 070311
  95. GRB 070311: Tautenburg sees afterglow fading
  96. GRB 070311: Optical observation.
  97. GRB 070311: Optical Brightening
  98. GRB 070306: possible emission-line redshift
  99. GRB 070311: SARA upper limit
  100. GRB 070309: variability of the XRT afterglow candidate

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