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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"

32707 results found.

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

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