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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"

21469 results found.

  1. GRB 070419A: Early Super-LOTIS Observations
  2. GRB 070419B, Swift-BAT refined analysis
  3. GRB 070419A Swift-BAT Refined Analysis
  4. GRB 070419A: RAPTOR Detection of Early Emission
  5. GRB 070419B: Swift XRT refined analysis
  6. GRB 070419A, Optical observations
  7. GRB070419 - SDSS Pre-Burst Observations
  8. GRB 070419A: Faulkes Telescope North Optical Observations
  9. GRB 070419B optical afterglow candidate
  10. GRB 070419B: optical afterglow candidate
  11. GRB070419A, optical observation
  12. GRB070330: Correction to UVOT position
  13. GRB 070419B: Swift detection of a burst
  14. GRB 070419 optical afterglow candidate
  15. GRB 070419A: ROTSE-III Optical Limits
  16. GRB 070419: Swift detection of a burst
  17. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  18. Trigger 276045: Swift detection of a possible burst
  19. GRB 070406: Swift XRT refined analysis
  20. GRB 070411: TLS data shows plateau, flares
  21. GRB070412: Swift UVOT observations
  22. GRB 070411: Swift/UVOT observations
  23. GRB 070412, Swift-BAT refined analysis
  24. GRB 070412 Liverpool Telescope optical limit
  25. GRB 070412: Swift-XRT refined analysis
  26. GRB 070411: Swift-XRT refined analysis
  27. GRB 070412: further reanalysis of NOT images
  28. GRB 070412: Optical observations at Crni Vrh
  29. GRB 070412: Swift-XRT refined position
  30. GRB 070412: further NOT observations
  31. GRB 070412: Gemini/GMOS afterglow candidate
  32. GRB 070412: NOT observations
  33. GRB 070412: Nearby bright galaxy
  34. GRB 070411, Swift-BAT refined analysis
  35. GRB 070412: Swift detection of a burst
  36. GRB 070411: ROTSE-III Detection of Optical Counterpart
  37. GRB 070411: Tautenburg RRM Afterglow Confirmation
  38. GRB 070411: Swift detection of a burst with optical afterglow
  39. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  40. GRB 070406: Swift XRT team further analysis
  41. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  42. GRB 070406: Bright galaxy in XRT error circle is a quasar
  43. GRB 070406, Swift-BAT refined analysis
  44. GRB 070406: Gemini South Imaging and XRT analysis
  45. GRB070406: Swift UVOT observations
  46. GRB 070406: further analysis of NOT images.
  47. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  48. GRB 070406: SARA upper limit
  49. GRB 070406: Xinglong TNT optical Upper Limit
  50. GRB 070406: Swift detection of a burst
  51. INTEGRAL ToO Observation of SGR1806-20
  52. UVOT observations of GRB070330
  53. GRB 070330, Swift-BAT refined analysis
  54. GRB 070330: TAROT La Silla observatory optical observations
  55. GRB 070330: Swift-XRT refined analysis
  56. GRB 070330: Swift detection of a burst
  57. GRB 070328: pseudo-z~2.75 from spectral parameters of the prompt
  58. Konus-Wind observation of GRB 070328
  59. GRB 070328: Swift/UVOT Upper Limits
  60. GRB 070328: Swift/XRT Refined Analysis
  61. GRB 070328, Swift-BAT refined analysis
  62. GRB 070328: Swift detection of a burst
  63. GRB070220: optical observations
  64. GRB070223: confirmation of nIR and optical afterglow
  65. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  66. GRB 070318: Gemini + Magellan spectra
  67. GRB070318: Swift UVOT continuing observations
  68. GRB070318: Swift-XRT refined analysis
  69. GRB 070318: Swift/UVOT Continued Observations
  70. GRB 070318, Swift-BAT refined analysis
  71. GRB 070318: Swift detection of a burst with an optical afterglow
  72. GRB 070311: Late Central Engine Activity Optical Flare??
  73. VLA observation of GRB 070311
  74. GRB 070309: variability of the XRT afterglow candidate
  75. GRB 070311: Swift/UVOT Upper Limits
  76. GRB 070311: MITSuME Okayama Optical Observation
  77. GRB 070311: Swift-XRT refined analysis
  78. GRB060901: Candidate optical afterglow
  79. GRB070309: Swift/XRT possible afterglow detection
  80. GRB 070125: Chandra X-ray Confirmation of Jet Break
  81. GRB 070309: Swift/UVOT Upper Limits
  82. GRB 070306, optical observation
  83. Swift UVOT Finding Charts for GRB 070309
  84. GRB 070125: X-ray light curve analysis
  85. VLA observation of GRB 070306
  86. GRB 070306: NOT observations
  87. GRB 070306 Swift/UVOT refined analysis
  88. GRB 070306: ART-3 early optical and near infrared constraints
  89. GRB 070306, Swift-BAT refined analysis
  90. GRB 070306: XRT Team Refined Analysis
  91. GRB 070306: Optical and IR observations with KANATA
  92. GRB070306 - SDSS Pre-burst Observations
  93. GRB 070306: Swift detection of a burst
  94. GRB 070223: NIR observations at WHT
  95. GRB070227: Swift-XRT refined analysis
  96. GRB 070125, deep late-time optical observation
  97. VLA observation of GRB 070224
  98. GRB 070227: optical observations
  99. GRB 070223: Optical Observations
  100. GRB 070227: optical observations

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