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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"

19538 results found.

  1. GRB 070429B: Swift XRT refined analysis
  2. GRB 070429B: ROTSE-III Optical Limits
  3. GRB 070429B: Swift detection of a short burst
  4. GRB 070429: ROTSE-III Optical Limits
  5. GRB 070429: Swift detection of a burst
  6. GRB 070427, Swift-BAT Refined Analysis
  7. GRB 070427: Swift detection of a burst
  8. GRB070419B: Suzaku WAM observation of the prompt emission
  9. GRB 070411, deep LBT photometry
  10. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  11. GRB 070420 Swift-BAT Refined Analysis
  12. GRB070419A: Kuiper Optical detection
  13. GRB070419a: Swift UVOT observations
  14. GRB 070419A: MARGE Observations
  15. GRB 070420: optical rebrightening observed at Mt. John
  16. GRB 070420: Swift XRT refined analysis
  17. GRB070420: Swift UVOT continuing observations
  18. GRB 070420: Faulkes Telescope South Observations
  19. GBR 070419A: Swift/XRT refined analysis
  20. GRB 070420: TAROT La Silla observatory optical observations
  21. GRB 070420: NIR and optical afterglow confirmed
  22. GRB 070420: Swift detection of a burst with optical afterglow
  23. GRB 070419A: Early Super-LOTIS Observations
  24. GRB 070419B, Swift-BAT refined analysis
  25. GRB 070419A Swift-BAT Refined Analysis
  26. GRB 070419A: RAPTOR Detection of Early Emission
  27. GRB 070419B: Swift XRT refined analysis
  28. GRB 070419A, Optical observations
  29. GRB070419 - SDSS Pre-Burst Observations
  30. GRB 070419A: Faulkes Telescope North Optical Observations
  31. GRB 070419B optical afterglow candidate
  32. GRB 070419B: optical afterglow candidate
  33. GRB070419A, optical observation
  34. GRB070330: Correction to UVOT position
  35. GRB 070419B: Swift detection of a burst
  36. GRB 070419A: ROTSE-III Optical Limits
  37. GRB 070419: Swift detection of a burst
  38. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  39. Trigger 276045: Swift detection of a possible burst
  40. GRB 070406: Swift XRT refined analysis
  41. GRB 070411: TLS data shows plateau, flares
  42. GRB070412: Swift UVOT observations
  43. GRB 070411: Swift/UVOT observations
  44. GRB 070412, Swift-BAT refined analysis
  45. GRB 070412: Swift-XRT refined analysis
  46. GRB 070411: Swift-XRT refined analysis
  47. GRB 070412: Optical observations at Crni Vrh
  48. GRB 070412: Swift-XRT refined position
  49. GRB 070411, Swift-BAT refined analysis
  50. GRB 070412: Swift detection of a burst
  51. GRB 070411: ROTSE-III Detection of Optical Counterpart
  52. GRB 070411: Tautenburg RRM Afterglow Confirmation
  53. GRB 070411: Swift detection of a burst with optical afterglow
  54. GRB 070406: Swift XRT team further analysis
  55. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  56. GRB 070406, Swift-BAT refined analysis
  57. GRB070406: Swift UVOT observations
  58. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  59. GRB 070406: SARA upper limit
  60. GRB 070406: Xinglong TNT optical Upper Limit
  61. GRB 070406: Swift detection of a burst
  62. INTEGRAL ToO Observation of SGR1806-20
  63. UVOT observations of GRB070330
  64. GRB 070330, Swift-BAT refined analysis
  65. GRB 070330: TAROT La Silla observatory optical observations
  66. GRB 070330: Swift-XRT refined analysis
  67. GRB 070330: Swift detection of a burst
  68. GRB 070328: pseudo-z~2.75 from spectral parameters of the prompt
  69. Konus-Wind observation of GRB 070328
  70. GRB 070328: Swift/UVOT Upper Limits
  71. GRB 070328: Swift/XRT Refined Analysis
  72. GRB 070328, Swift-BAT refined analysis
  73. GRB 070328: Swift detection of a burst
  74. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  75. GRB 070318: Gemini + Magellan spectra
  76. GRB070318: Swift UVOT continuing observations
  77. GRB070318: Swift-XRT refined analysis
  78. GRB 070318: Swift/UVOT Continued Observations
  79. GRB 070318, Swift-BAT refined analysis
  80. GRB 070318: Swift detection of a burst with an optical afterglow
  81. GRB 070311: Late Central Engine Activity Optical Flare??
  82. VLA observation of GRB 070311
  83. GRB 070309: variability of the XRT afterglow candidate
  84. GRB 070311: Swift/UVOT Upper Limits
  85. GRB 070311: Swift-XRT refined analysis
  86. GRB070309: Swift/XRT possible afterglow detection
  87. GRB 070125: Chandra X-ray Confirmation of Jet Break
  88. GRB 070309: Swift/UVOT Upper Limits
  89. Swift UVOT Finding Charts for GRB 070309
  90. GRB 070125: X-ray light curve analysis
  91. VLA observation of GRB 070306
  92. GRB 070306: NOT observations
  93. GRB 070306 Swift/UVOT refined analysis
  94. GRB 070306, Swift-BAT refined analysis
  95. GRB 070306: XRT Team Refined Analysis
  96. GRB070306 - SDSS Pre-burst Observations
  97. GRB 070306: Swift detection of a burst
  98. GRB070227: Swift-XRT refined analysis
  99. GRB 070125, deep late-time optical observation
  100. VLA observation of GRB 070224

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