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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"

27394 results found.

  1. GRB050408: REM NIR and Optical observation
  2. GRB 050408,optical observation
  3. GRB 050408: Mercator Optical Observations
  4. GRB 050408: Optical afterglow confirmed
  5. GRB 050408: opitcal observation
  6. GRB 050408, optical observations
  7. GRB 050408 optical candidate
  8. GRB 050408: Swift XRT Position
  9. GRB050408: MASTER optical observations
  10. GRB050401: Radio Detection
  11. GRB 050406: early Swift XRT analysis results
  12. GRB 050406 BAT refined analysis
  13. GRB 050406: Early observations with Swift-UVOT
  14. Swift-BAT detection of GRB 050406
  15. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  16. GRB 050401: VLT spectroscopic redshift
  17. GRB 050401 BAT refined analysis
  18. GRB050401: TNG R-band observation
  19. GRB 050402: Early observations with Swift-UVOT
  20. Swift Trigger 113225: P60 Observations
  21. GRB 050401: Optical afterglow confirmed
  22. GRB 050401: Prompt XRT position
  23. Retraction of three Swift GRB triggers
  24. GRB050331: No Afterglow Detected
  25. Swift-BAT detection of GRB 050331b
  26. GRB 050331: Swift UVOT Source
  27. Swift-BAT detection of GRB 050331
  28. GRB 050326: Early observations with Swift-UVOT
  29. GRB 050326 XMM-Newton observation
  30. GRB 050326: Swift XRT Position
  31. GRB 050326 BAT refined analysis
  32. GRB050326: delayed XRT observation
  33. GRB050319, color indices
  34. GRB050319: optical observation, March 20-22
  35. GRB050319: RTT150 Optical Observations
  36. Swift-BAT trigger 112060 is not a real GRB
  37. GRB 050318: Swift-BAT refined analysis
  38. GRB050319: VLA Observations
  39. GRB050319: radio observation
  40. GRB 050319: Swift-UVOT detection of the afterglow
  41. GRB 050315: Variability Analysis of Swift BAT Time History
  42. GRB050319: Radio Observations
  43. GRB 050319: NIR afterglow candidate
  44. GRB 050319:Near IR afterglow
  45. GRB 050318: SWIFT-UVOT refined analysis
  46. GRB 050319 : Confirmation of optical afterglow decay
  47. GRB 050319: Swift-BAT refined analysis
  48. GRB050319,optical observation
  49. GRB 050318: Swift/UVOT detection of afterglow emission
  50. RXTE Observations of GRB050318
  51. GRB050223: analysis of the XMM-Newton observation
  52. GRB050316: MASTER before, simultanious and follow up optical
  53. GRB 050306: ROTSE-III early limits
  54. GRB050316: MASTER optical observations
  55. GRB 050315: Swift-BAT further refined analysis
  56. GRB 050315 I-band observations
  57. GRB050315: Radio afterglow
  58. GRB050315: Swift-BAT Refined analysis
  59. Non-detection of GRB050315 in ATCA Radio Observations
  60. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  61. GRB 050315: Early Observations with Swift/UVOT
  62. GRB 050306: Radio Observations
  63. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  64. GRB 050306: optical afterglow
  65. Swift-BAT trigger 107873: No Swift XRT counterpart
  66. GRB 050306: Confirmation of X-ray afterglow
  67. GRB 050306: further TAROT optical data
  68. GRB050309: Early optical limit from P60
  69. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  70. GRB 050309 : Lulin R-band observation
  71. Swift 107873: P60 Optical Observations
  72. GRB 050306: R-band observations
  73. GRB 050306: REM optical-infrared observations
  74. GRB 050306: Possible X-ray Afterglow Position from the Swift
  75. GRB 050306: TAROT optical observations
  76. GRB 050306,optical observation
  77. Ongoing activity of SGR 1806-20 after the giant flare
  78. GRB050215B: Late-Time Swift UVOT Observations
  79. PROMPT VRcIc Observations of GRB 050223
  80. XRF/GRB 050215B: Radio Observations
  81. XMM-Newton Images of GRB 050223
  82. GRB 050219b: candidate NIR afterglow
  83. Confirmed XRF nature for GRB050215b
  84. GRB050223 XMM-Newton observation
  85. INTEGRAL detection of GRB 050223
  86. GRB050223: ROTSE-III Optical Observations
  87. GRB 050223 Swift/BAT detection of a burst
  88. GRB 050223: Swift XRT Position
  89. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  90. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  91. GRB 050219a: Optical observations from LCO
  92. GRB 050219b: Optical and near-IR observations from LCO
  93. GRB 050219b: Swift-BAT detection of a burst
  94. GRB 050219b: CORRECTION: Swift XRT Position
  95. GRB 050219b: Swift XRT Position
  96. GRB 050219: Swift-BAT detection of a burst
  97. GRB 050215b: XRT confirmation of IR afterglow candidate
  98. GRB050215b: P60 Optical Observations
  99. GRB 050215b: Swift XRT Source Variability
  100. GRB 050215B: candidate afterglow

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