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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"

32685 results found.

  1. GRB 070318: absorption-line redshift
  2. GRB070318: Swift UVOT continuing observations
  3. GRB070318: Swift-XRT refined analysis
  4. GRB 070318: Swift/UVOT Continued Observations
  5. GRB 070318, Swift-BAT refined analysis
  6. GRB 070311: Late Central Engine Activity Optical Flare??
  7. GRB 070311: MDM Optical Monitoring
  8. VLA observation of GRB 070311
  9. GRB 070311: Tautenburg sees afterglow fading
  10. GRB 070311: Optical observation.
  11. GRB 070311: Optical Brightening
  12. GRB 070306: possible emission-line redshift
  13. GRB 070311: SARA upper limit
  14. GRB 070309: variability of the XRT afterglow candidate
  15. GRB 070311: MDM Optical Follow-up
  16. GRB 070311: RAPTOR Detection of Optical Emission
  17. GRB070311: FRAM early follow-up limit
  18. GRB 070311: P60 Observations
  19. GRB 070311: MDM Optical Detection
  20. GRB 070311: Swift/UVOT Upper Limits
  21. GRB 070311: MITSuME Okayama Optical Observation
  22. GRB 070311: Swift-XRT refined analysis
  23. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  24. GRB 070311: REM candidate afterglow
  25. GRB060901: Candidate optical afterglow
  26. GRB070309: Swift/XRT possible afterglow detection
  27. GRB 070125: Chandra X-ray Confirmation of Jet Break
  28. GRB 070309: Swift/UVOT Upper Limits
  29. GRB 070306, optical observation
  30. Swift UVOT Finding Charts for GRB 070309
  31. GRB 070125: X-ray light curve analysis
  32. VLA observation of GRB 070306
  33. GRB 070306: NOT observations
  34. GRB 070306 Swift/UVOT refined analysis
  35. GRB070306: confirmation of near infrared afterglow
  36. GRB 070306: ART-3 early optical and near infrared constraints
  37. GRB 070306, Swift-BAT refined analysis
  38. GRB 070306: XRT Team Refined Analysis
  39. GRB 070306: Optical and IR observations with KANATA
  40. GRB 070223: NIR observations at WHT
  41. GRB070227: Swift-XRT refined analysis
  42. GRB 060605 new redshift
  43. GRB 070125, deep late-time optical observation
  44. VLA observation of GRB 070224
  45. GRB 070223: Optical Observations
  46. GRB 070227: optical observations
  47. GRB 070227: Swift/UVOT Upper Limits
  48. GRB 070227, Swift-BAT refined analysis
  49. GRB070227: possible X-ray afterglow detection
  50. GRB 070224: Optical afterglow confirmation
  51. GRB 070224: Swift/UVOT Upper Limits
  52. GRB070224: Swift-XRT Astrometrically Corrected Position
  53. VLA observation of GRB 070223
  54. VLA observation of GRB 070220
  55. GRB070224: Magellan Imaging Observations
  56. GRB 070224: WHT K-band imaging
  57. GRB 070224: MDM Observations
  58. GRB070224: Gemini Imaging Observations
  59. GRB070224: Swift-XRT Refined Analysis
  60. GRB 070224: optical afterglow candidate
  61. GRB 070224, Swift-BAT refined analysis
  62. GRB 070224: MASTER-Net refind analysis
  63. GRB 070224: MASTER-VWF-Kislovodsk observations
  64. GRB 070223: Optical observations
  65. RHESSI Spectrum of GRB070220
  66. GRB070223: Swift/UVOT refined analysis
  67. GRB 070223: Optical-IR observation with KANATA
  68. GRB 070223, Swift-BAT refined analysis
  69. GRB070223: MASTER-VWF-Kislovodsk observations
  70. GRB 070223: Swift-XRT Refined Analysis
  71. GRB070223 - SDSS Pre-Burst Observations
  72. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  73. GRB 070223: MDM Observations
  74. Konus-Wind and Konus-A observations of GRB 070220
  75. GRB 070220: MITSuME Okayama Optical Observation
  76. GRB 070220: ART-3 Optical and NIR limits
  77. GRB 070220 Swift-BAT Refined Analysis
  78. Swift/UVOT refined analysis of GRB070220
  79. GRB 070209: Swift XRT refined analysis
  80. GRB 070220: Swift-XRT Refined Analysis
  81. GRB 070220: Observation with the KANATA 1.5m telescope
  82. GRB 070219: Gemini Observations
  83. GRB 070220 : Faulkes Telescope North optical limit
  84. GRB070219: MASTER-VWF-Kislovodsk observations
  85. GRB 070219: XRT Refined Analysis
  86. GRB 070219: Swift/UVOT Upper limits
  87. GRB 070219: I-band observations
  88. GRB 070219, Swift-BAT refined analysis
  89. GRB 070219: optical TNG observations
  90. GRB 070219: Liverpool Telescope Observations
  91. GRB 070219: ROTSE-III Optical Limits
  92. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  93. GRB 070125 observations with the GMRT
  94. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  95. GRB 060927: PROMPT Observations
  96. GRB 070201: Correction to GCN 6094
  97. GRB 070125: Break in Optical Decay
  98. GRB 070209: Swift XRT analysis
  99. GRB 070201: clarification on localization and Konus-Wind spectra
  100. GRB070208: optical observations

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