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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"

21903 results found.

  1. GRB 070509: objects inside XRT error circle
  2. GRB 070512: IPN localization and Konus spectrum of a bright burst
  3. GRB 070509: Swift/UVOT Upper Limits
  4. Konus-Wind and Konus-A observation of GRB 070508
  5. RHESSI Spectrum of GRB070508
  6. GRB 070508: Suzaku/WAM observation of the prompt emission
  7. GRB 070509: REM observations
  8. GRB 070509: ROTSE-III Optical Limits
  9. GRB070508: Swift/UVOT Observations
  10. GRB 070508, Swift-BAT refined analysis
  11. GRB 070508: REM observations
  12. GRB 070508: TAROT La Silla observatory optical observations
  13. GRB 070508: Swift detection of an intense burst with an optical counterpart
  14. GRB070506: Swift/UVOT Observations
  15. GRB 070506: Swift detection of a burst with optical afterglow
  16. GRB070429B: VLT observations
  17. GRB070429B: position correction
  18. GRB 070309: Swift-XRT afterglow confirmation
  19. VLA observation of GRB 070429B
  20. Swift/UVOT observations of GRB070429B
  21. Swift/UVOT observations of GRB070429A
  22. GRB 070429A: optical and NIR observations
  23. GRB 070429B: ROTSE-III Optical Limits
  24. GRB 070429: ROTSE-III Optical Limits
  25. GRB 070429: Swift detection of a burst
  26. LT monitoring of GRB070412
  27. GRB 070427: Swift detection of a burst
  28. GRB 070411: Late-time Keck imaging
  29. GRB070419B: Suzaku WAM observation of the prompt emission
  30. Konus-Wind observation of GRB 070420
  31. GRB 070420 Swift-BAT Refined Analysis
  32. GRB070420: Swift UVOT continuing observations
  33. GRB 070420: Faulkes Telescope South Observations
  34. GBR 070419A: Swift/XRT refined analysis
  35. GRB 070420: TAROT La Silla observatory optical observations
  36. GRB 070420: NIR and optical afterglow confirmed
  37. GRB 070420: Swift detection of a burst with optical afterglow
  38. GRB 070419A: MITSuME Okayama Observations
  39. GRB 070419A: Early Super-LOTIS Observations
  40. GRB070419 - SDSS Pre-Burst Observations
  41. GRB 070419A: SARA observations
  42. GRB 070419A: NAYUTA Optical Observation
  43. GRB 070419A: Optical and IR observations with KANATA
  44. GRB070419A, optical observation
  45. Infrared detection of GRB070419A with UKIRT
  46. GRB 070419A: Kiso Optical observation
  47. GRB 070419: P60 Confirmation of Optical Afterglow
  48. GRB 070419B: Swift detection of a burst
  49. GRB 070419A: ROTSE-III Optical Limits
  50. GRB 070419: Swift detection of a burst
  51. GRB 070418: Optical and IR observations with KANATA
  52. Trigger 276045: Swift detection of a possible burst
  53. GRB 070406: Swift XRT refined analysis
  54. GRB070412: UKIRT-WFCAM JHK upper limits
  55. GRB070412: Swift UVOT observations
  56. GRB 070411: Swift/UVOT observations
  57. GRB 070412, Swift-BAT refined analysis
  58. GRB 070412 Liverpool Telescope optical limit
  59. GRB 070412: Optical observations at Crni Vrh
  60. GRB 070412: further NOT observations
  61. GRB 070412: IAC80 optical afterglow candidate
  62. GRB 070412: NOT observations
  63. GRB 070411, Swift-BAT refined analysis
  64. GRB 070412: Swift detection of a burst
  65. GRB 070411: IAC80 optical observations
  66. GRB 070411 : Liverpool Telescope Observations
  67. GRB 070411: Tautenburg RRM Afterglow Confirmation
  68. GRB 070411: Swift detection of a burst with optical afterglow
  69. GRB 070406: Swift XRT team further analysis
  70. Suzaku ToO observation of SGR 1806-20
  71. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  72. GRB 070406: Correction to the optical candidate in GCN6253
  73. GRB 070406: Gemini South Imaging and XRT analysis
  74. GRB070406: Swift UVOT observations
  75. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  76. GRB 070406: NOT observations
  77. GRB 070406: SARA upper limit
  78. GRB 070406: Xinglong TNT optical Upper Limit
  79. GRB 070402: Suzaku WAM observation of the prompt emission
  80. Konus-Wind and Konus-A observations of GRB 070402
  81. IPN triangulation of GRB070402
  82. GRB 070328: Suzaku WAM observation of the prompt emission
  83. UVOT observations of GRB070330
  84. GRB 070330: TAROT La Silla observatory optical observations
  85. GRB 070330 - Watcher Observations
  86. Konus-Wind observation of GRB 070328
  87. GRB 070328: Swift/UVOT Upper Limits
  88. long burst from SGR 1806-20 detected on March 26
  89. GRB 070328 : Suzaku ToO follow up starts
  90. GRB 070328, Swift-BAT refined analysis
  91. GRB 070328: Swift detection of a burst
  92. GRB 070311, deep optical photometry
  93. Short-Hard GRB 070209: PROMPT Observations
  94. GRB 070318: absorption-line redshift
  95. GRB070318: Swift UVOT continuing observations
  96. GRB 070318: Swift detection of a burst with an optical afterglow
  97. VLA observation of GRB 070311
  98. GRB 070311: Optical observation.
  99. GRB 070306: possible emission-line redshift
  100. GRB 070311: SARA upper limit

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