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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

22116 results found.

  1. GRB 070509: REM observations
  2. GRB 070509: Swift detection of a burst
  3. GRB 070509: ROTSE-III Optical Limits
  4. GRB 070508: REM observations
  5. GRB 070508: TAROT La Silla observatory optical observations
  6. GRB 070508: Swift detection of an intense burst with an optical counterpart
  7. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  8. GRB070506: Swift/UVOT Observations
  9. GRB 070506: Swift detection of a burst with optical afterglow
  10. GRB 070412, deep LBT imaging
  11. GRB070429B: VLT observations
  12. GRB070429B: position correction
  13. GRB 070309: Swift-XRT afterglow confirmation
  14. VLA observation of GRB 070429B
  15. Swift/UVOT observations of GRB070429B
  16. GRB 070429B, Swift-BAT refined analysis
  17. Swift/UVOT observations of GRB070429A
  18. GRB 070429A: optical and NIR observations
  19. GRB 070429B: ROTSE-III Optical Limits
  20. GRB 070429B: Swift detection of a short burst
  21. GRB 070429: ROTSE-III Optical Limits
  22. GRB 070429: Swift detection of a burst
  23. LT monitoring of GRB070412
  24. GRB 070427: Swift detection of a burst
  25. GRB 070411, further deep LBT photometry
  26. GRB 070411: Late-time Keck imaging
  27. GRB070419a: Swift UVOT observations
  28. GRB 070420: Swift XRT refined analysis
  29. GRB070420: Swift UVOT continuing observations
  30. GRB 070420: Faulkes Telescope South Observations
  31. GRB 070420: TAROT La Silla observatory optical observations
  32. GRB 070420: NIR and optical afterglow confirmed
  33. GRB 070420: Swift detection of a burst with optical afterglow
  34. GRB 070419A: MITSuME Okayama Observations
  35. GRB 070419B: Swift XRT refined analysis
  36. GRB070419 - SDSS Pre-Burst Observations
  37. GRB 070419A: SARA observations
  38. GRB 070419A: NAYUTA Optical Observation
  39. GRB 070419A: Optical and IR observations with KANATA
  40. GRB070419A, optical observation
  41. Infrared detection of GRB070419A with UKIRT
  42. GRB 070419A: Kiso Optical observation
  43. GRB 070419: P60 Confirmation of Optical Afterglow
  44. GRB 070419B: Swift detection of a burst
  45. GRB 070419A: ROTSE-III Optical Limits
  46. GRB 070419: Swift detection of a burst
  47. GRB 070418: Optical and IR observations with KANATA
  48. Trigger 276045: Swift detection of a possible burst
  49. GRB 070406: Swift XRT refined analysis
  50. GRB 070318, SMARTS optical/IR afterglow observations
  51. GRB070412: UKIRT-WFCAM JHK upper limits
  52. GRB070412: Swift UVOT observations
  53. GRB 070411: Swift/UVOT observations
  54. GRB 070412, Swift-BAT refined analysis
  55. GRB 070412 Liverpool Telescope optical limit
  56. GRB 070411: Optical photometry at Crni Vrh
  57. GRB 070412: Swift-XRT refined analysis
  58. GRB 070412: Optical observations at Crni Vrh
  59. GRB 070412: further NOT observations
  60. GRB 070412: IAC80 optical afterglow candidate
  61. GRB 070412: NOT observations
  62. GRB 070411, Swift-BAT refined analysis
  63. GRB 070412: Swift detection of a burst
  64. GRB 070411: IAC80 optical observations
  65. GRB 070411 : Liverpool Telescope Observations
  66. GRB 070411: Swift detection of a burst with optical afterglow
  67. GRB 070406: Swift XRT team further analysis
  68. Suzaku ToO observation of SGR 1806-20
  69. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  70. GRB 070406: Correction to the optical candidate in GCN6253
  71. GRB 070406: Gemini South Imaging and XRT analysis
  72. GRB070406: Swift UVOT observations
  73. Short GRB 070406 - Possible Bright Host Galaxy
  74. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  75. GRB 070406: NOT observations
  76. GRB 070406: SARA upper limit
  77. GRB 070406: Xinglong TNT optical Upper Limit
  78. GRB 070406: Swift detection of a burst
  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: Swift-XRT refined analysis
  86. GRB 070330 - Watcher Observations
  87. GRB 070330: Swift detection of a burst
  88. GRB 070328: Swift/UVOT Upper Limits
  89. long burst from SGR 1806-20 detected on March 26
  90. GRB 070328 : Suzaku ToO follow up starts
  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. GRB070318: Swift-XRT refined analysis
  97. GRB 070318, Swift-BAT refined analysis
  98. GRB 070318: Swift detection of a burst with an optical afterglow
  99. VLA observation of GRB 070311
  100. GRB 070311: Optical observation.

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