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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"

42434 results found.

  1. IPN triangulation of GRB070402
  2. GRB 070328: Suzaku WAM observation of the prompt emission
  3. INTEGRAL ToO Observation of SGR1806-20
  4. UVOT observations of GRB070330
  5. GRB 070330, Swift-BAT refined analysis
  6. GRB 070330, SMARTS optical/IR observations
  7. GRB 070330: TAROT La Silla observatory optical observations
  8. GRB 070330: Swift-XRT refined analysis
  9. GRB 070330 - Watcher Observations
  10. GRB 070330: Swift detection of a burst
  11. Konus-Wind observation of GRB 070328
  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. GRB 070328: Swift detection of a burst
  17. GRB070220: optical observations
  18. GRB070208: optical observations
  19. GRB070223: confirmation of nIR and optical afterglow
  20. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  21. GRB 070311, deep optical photometry
  22. Short-Hard GRB 070209: PROMPT Observations
  23. GRB 070318: Gemini + Magellan spectra
  24. GRB 070318: absorption-line redshift
  25. GRB070318: Swift-XRT refined analysis
  26. GRB 070318: Swift/UVOT Continued Observations
  27. GRB 070318, Swift-BAT refined analysis
  28. GRB 070318: Swift detection of a burst with an optical afterglow
  29. GRB 070311: Late Central Engine Activity Optical Flare??
  30. GRB 070311: MDM Optical Monitoring
  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 070309: variability of the XRT afterglow candidate
  36. GRB 070311: MDM Optical Follow-up
  37. GRB 070311: RAPTOR Detection of Optical Emission
  38. GRB 070311: P60 Observations
  39. GRB 070311: MDM Optical Detection
  40. GRB 070311: MITSuME Okayama Optical Observation
  41. GRB 070311: Swift-XRT refined analysis
  42. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  43. GRB 070311: REM candidate afterglow
  44. GRB 070311: a long GRB detected by INTEGRAL
  45. GRB060901: Candidate optical afterglow
  46. GRB070309: Swift/XRT possible afterglow detection
  47. GRB 070125: Chandra X-ray Confirmation of Jet Break
  48. GRB 070306, optical observation
  49. GRB 070309: A long GRB detected by INTEGRAL
  50. GRB 070125: X-ray light curve analysis
  51. GRB 070306: NOT observations
  52. GRB 070306 Swift/UVOT refined analysis
  53. GRB070306: confirmation of near infrared afterglow
  54. GRB 070306: ART-3 early optical and near infrared constraints
  55. GRB 070306: IR observations and candidate afterglow
  56. GRB 070306, Swift-BAT refined analysis
  57. GRB 070306: XRT Team Refined Analysis
  58. GRB 070306: Optical and IR observations with KANATA
  59. GRB070306 - SDSS Pre-burst Observations
  60. GRB 070306: Swift detection of a burst
  61. GRB 070223: NIR observations at WHT
  62. GRB070227: Swift-XRT refined analysis
  63. GRB 060605 new redshift
  64. GRB 070125, deep late-time optical observation
  65. GRB 070227: optical observations
  66. GRB 070223: Optical Observations
  67. GRB 070227: optical observations
  68. GRB 070227: Swift/UVOT Upper Limits
  69. GRB 070227: TAROT La Silla observatory optical observations
  70. GRB 070227, Swift-BAT refined analysis
  71. GRB070227: possible X-ray afterglow detection
  72. GRB 070227: Swift detection of a burst in ground analysis
  73. GRB 920925C: optical afterglow candidate
  74. GRB 070224: Optical afterglow confirmation
  75. GRB070224: Swift-XRT Astrometrically Corrected Position
  76. GRB070224: Magellan Imaging Observations
  77. GRB 070224: WHT K-band imaging
  78. GRB 070224: MDM Observations
  79. GRB070224: Gemini Imaging Observations
  80. GRB070224: Swift-XRT Refined Analysis
  81. GRB 070224: optical afterglow candidate
  82. GRB 070224, Swift-BAT refined analysis
  83. GRB 070224: Swift detection of a burst
  84. GRB 070223: Optical observations
  85. RHESSI Spectrum of GRB070220
  86. GRB070223: Swift/UVOT refined analysis
  87. GRB 070223: Optical-IR observation with KANATA
  88. GRB 070223, Swift-BAT refined analysis
  89. GRB 070223: Swift-XRT Refined Analysis
  90. GRB070223 - SDSS Pre-Burst Observations
  91. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  92. GRB 070223: MDM Observations
  93. GRB070223: Swift burst
  94. Konus-Wind and Konus-A observations of GRB 070220
  95. GRB 070220: MITSuME Okayama Optical Observation
  96. GRB 070220: ART-3 Optical and NIR limits
  97. GRB 070220 Swift-BAT Refined Analysis
  98. Swift/UVOT refined analysis of GRB070220
  99. GRB 070209: Swift XRT refined analysis
  100. GRB 070220: Swift-XRT Refined Analysis

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