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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"

26540 results found.

  1. GRB 070412: Optical observations at Crni Vrh
  2. GRB 070411: OA redshift
  3. GRB 070412: further NOT observations
  4. GRB 070412: IAC80 optical afterglow candidate
  5. GRB 070412: NOT observations
  6. GRB 070412: Swift detection of a burst
  7. GRB 070411: IAC80 optical observations
  8. GRB 070411 : Liverpool Telescope Observations
  9. GRB 070411: Swift detection of a burst with optical afterglow
  10. GRB 070406: Swift XRT team further analysis
  11. Suzaku ToO observation of SGR 1806-20
  12. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  13. GRB 070406: Correction to the optical candidate in GCN6253
  14. GRB 070406: Gemini South Imaging and XRT analysis
  15. GRB070406: Swift UVOT observations
  16. GRB 070406: NOT observations
  17. GRB 070406: SARA upper limit
  18. GRB 070406: Xinglong TNT optical Upper Limit
  19. GRB 070402: Suzaku WAM observation of the prompt emission
  20. Konus-Wind and Konus-A observations of GRB 070402
  21. IPN triangulation of GRB070402
  22. GRB 070328: Suzaku WAM observation of the prompt emission
  23. UVOT observations of GRB070330
  24. GRB 070330: TAROT La Silla observatory optical observations
  25. GRB 070330: Swift-XRT refined analysis
  26. GRB 070330 - Watcher Observations
  27. Konus-Wind observation of GRB 070328
  28. GRB 070328: Swift/UVOT Upper Limits
  29. GRB 070328: Swift/XRT Refined Analysis
  30. GRB 070328 : Suzaku ToO follow up starts
  31. GRB 070328: Swift detection of a burst
  32. GRB 070311, deep optical photometry
  33. Short-Hard GRB 070209: PROMPT Observations
  34. GRB 070318: absorption-line redshift
  35. GRB070318: Swift UVOT continuing observations
  36. GRB070318: Swift-XRT refined analysis
  37. GRB 070318: Swift/UVOT Continued Observations
  38. GRB 070318, Swift-BAT refined analysis
  39. GRB 070318: Swift detection of a burst with an optical afterglow
  40. GRB 070311: Late Central Engine Activity Optical Flare??
  41. GRB 070311: MDM Optical Monitoring
  42. VLA observation of GRB 070311
  43. GRB 070311: Tautenburg sees afterglow fading
  44. GRB 070311: Optical observation.
  45. GRB 070306: possible emission-line redshift
  46. GRB 070311: SARA upper limit
  47. GRB070311: FRAM early follow-up limit
  48. GRB 070311: P60 Observations
  49. GRB 070311: Swift/UVOT Upper Limits
  50. GRB 070311: MITSuME Okayama Optical Observation
  51. GRB 070311: Swift-XRT refined analysis
  52. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  53. GRB 070311: REM candidate afterglow
  54. GRB060901: Candidate optical afterglow
  55. GRB 070125: Chandra X-ray Confirmation of Jet Break
  56. GRB 070309: Swift/UVOT Upper Limits
  57. GRB 070306, optical observation
  58. Swift UVOT Finding Charts for GRB 070309
  59. GRB 070125: X-ray light curve analysis
  60. VLA observation of GRB 070306
  61. GRB 070306: NOT observations
  62. GRB 070306 Swift/UVOT refined analysis
  63. GRB 070306: IR observations and candidate afterglow
  64. GRB 070306: XRT Team Refined Analysis
  65. GRB 070306: Optical and IR observations with KANATA
  66. GRB070306 - SDSS Pre-burst Observations
  67. GRB 070306: Swift detection of a burst
  68. GRB070227: Swift-XRT refined analysis
  69. GRB 060605 new redshift
  70. GRB 070125, deep late-time optical observation
  71. VLA observation of GRB 070224
  72. GRB 070227: optical observations
  73. GRB 070223: Optical Observations
  74. GRB 070227: optical observations
  75. GRB 070227: Swift/UVOT Upper Limits
  76. GRB 070227: TAROT La Silla observatory optical observations
  77. GRB 070227, Swift-BAT refined analysis
  78. GRB 070227: Swift detection of a burst in ground analysis
  79. GRB 070224: Swift/UVOT Upper Limits
  80. VLA observation of GRB 070223
  81. VLA observation of GRB 070220
  82. GRB070224: Magellan Imaging Observations
  83. GRB 070224: WHT K-band imaging
  84. GRB 070224: MDM Observations
  85. GRB070224: Gemini Imaging Observations
  86. GRB 070224: SARA upper limit
  87. GRB070224: Swift-XRT Refined Analysis
  88. GRB 070224: optical afterglow candidate
  89. GRB 070224: MASTER-Net refind analysis
  90. GRB 070224: MASTER-VWF-Kislovodsk observations
  91. GRB 070224: Swift detection of a burst
  92. GRB 070223: Optical observations
  93. RHESSI Spectrum of GRB070220
  94. GRB070223: Swift/UVOT refined analysis
  95. GRB 070223: Optical-IR observation with KANATA
  96. GRB 070223, Swift-BAT refined analysis
  97. GRB070223: MASTER-VWF-Kislovodsk observations
  98. GRB 070223: Swift-XRT Refined Analysis
  99. GRB070223 - SDSS Pre-Burst Observations
  100. GRB 070223: Liverpool Telescope Possible Afterglow Candidate

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