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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"

19606 results found.

  1. GRB 070419B optical afterglow candidate
  2. GRB 070419B: optical afterglow candidate
  3. GRB070419A, optical observation
  4. GRB070330: Correction to UVOT position
  5. GRB 070419B: Swift detection of a burst
  6. GRB 070419A: ROTSE-III Optical Limits
  7. GRB 070419: Swift detection of a burst
  8. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  9. Trigger 276045: Swift detection of a possible burst
  10. GRB 070406: Swift XRT refined analysis
  11. GRB 070411: TLS data shows plateau, flares
  12. GRB070412: Swift UVOT observations
  13. GRB 070411: Swift/UVOT observations
  14. GRB 070412, Swift-BAT refined analysis
  15. GRB 070412: Swift-XRT refined analysis
  16. GRB 070411: Swift-XRT refined analysis
  17. GRB 070412: Optical observations at Crni Vrh
  18. GRB 070412: Swift-XRT refined position
  19. GRB 070411, Swift-BAT refined analysis
  20. GRB 070412: Swift detection of a burst
  21. GRB 070411: ROTSE-III Detection of Optical Counterpart
  22. GRB 070411: Tautenburg RRM Afterglow Confirmation
  23. GRB 070411: Swift detection of a burst with optical afterglow
  24. GRB 070406: Swift XRT team further analysis
  25. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  26. GRB 070406, Swift-BAT refined analysis
  27. GRB070406: Swift UVOT observations
  28. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  29. GRB 070406: SARA upper limit
  30. GRB 070406: Xinglong TNT optical Upper Limit
  31. GRB 070406: Swift detection of a burst
  32. INTEGRAL ToO Observation of SGR1806-20
  33. UVOT observations of GRB070330
  34. GRB 070330, Swift-BAT refined analysis
  35. GRB 070330: TAROT La Silla observatory optical observations
  36. GRB 070330: Swift-XRT refined analysis
  37. GRB 070330: Swift detection of a burst
  38. GRB 070328: pseudo-z~2.75 from spectral parameters of the prompt
  39. Konus-Wind observation of GRB 070328
  40. GRB 070328: Swift/UVOT Upper Limits
  41. GRB 070328: Swift/XRT Refined Analysis
  42. GRB 070328, Swift-BAT refined analysis
  43. GRB 070328: Swift detection of a burst
  44. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  45. GRB 070318: Gemini + Magellan spectra
  46. GRB070318: Swift UVOT continuing observations
  47. GRB070318: Swift-XRT refined analysis
  48. GRB 070318: Swift/UVOT Continued Observations
  49. GRB 070318, Swift-BAT refined analysis
  50. GRB 070318: Swift detection of a burst with an optical afterglow
  51. GRB 070311: Late Central Engine Activity Optical Flare??
  52. VLA observation of GRB 070311
  53. GRB 070309: variability of the XRT afterglow candidate
  54. GRB 070311: Swift/UVOT Upper Limits
  55. GRB 070311: Swift-XRT refined analysis
  56. GRB070309: Swift/XRT possible afterglow detection
  57. GRB 070125: Chandra X-ray Confirmation of Jet Break
  58. GRB 070309: Swift/UVOT Upper Limits
  59. Swift UVOT Finding Charts for GRB 070309
  60. GRB 070125: X-ray light curve analysis
  61. VLA observation of GRB 070306
  62. GRB 070306: NOT observations
  63. GRB 070306 Swift/UVOT refined analysis
  64. GRB 070306, Swift-BAT refined analysis
  65. GRB 070306: XRT Team Refined Analysis
  66. GRB070306 - SDSS Pre-burst Observations
  67. GRB 070306: Swift detection of a burst
  68. GRB070227: Swift-XRT refined analysis
  69. GRB 070125, deep late-time optical observation
  70. VLA observation of GRB 070224
  71. GRB 070227: optical observations
  72. GRB 070223: Optical Observations
  73. GRB 070227: optical observations
  74. GRB 070227: Swift/UVOT Upper Limits
  75. GRB 070227: TAROT La Silla observatory optical observations
  76. GRB 070227, Swift-BAT refined analysis
  77. GRB070227: possible X-ray afterglow detection
  78. GRB 070227: Swift detection of a burst in ground analysis
  79. GRB 070224: Optical afterglow confirmation
  80. GRB 070224: Swift/UVOT Upper Limits
  81. GRB070224: Swift-XRT Astrometrically Corrected Position
  82. VLA observation of GRB 070223
  83. VLA observation of GRB 070220
  84. GRB070224: Magellan Imaging Observations
  85. GRB070224: Gemini Imaging Observations
  86. GRB 070224: SARA upper limit
  87. GRB070224: Swift-XRT Refined Analysis
  88. GRB 070224, Swift-BAT refined analysis
  89. GRB 070224: MASTER-Net refind analysis
  90. GRB 070224: MASTER-VWF-Kislovodsk observations
  91. GRB 070224: Swift detection of a burst
  92. GRB070223: Swift/UVOT refined analysis
  93. GRB 070223, Swift-BAT refined analysis
  94. GRB070223: MASTER-VWF-Kislovodsk observations
  95. GRB 070223: Swift-XRT Refined Analysis
  96. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  97. GRB 070223: MDM Observations
  98. GRB070223: Swift burst
  99. Konus-Wind and Konus-A observations of GRB 070220
  100. GRB 070220 Swift-BAT Refined Analysis

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