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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"

32710 results found.

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

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