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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"

25050 results found.

  1. GRB 050406: Swift XRT Position
  2. Swift-BAT detection of GRB 050406
  3. Konus-Wind observation of GRB 050401
  4. GRB050401: Radio observation at 610 MHz with GMRT
  5. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  6. GRB 050401: VLT spectroscopic redshift
  7. GRB 050401 BAT refined analysis
  8. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  9. GRB050401: TNG R-band observation
  10. GRB 050402: Early observations with Swift-UVOT
  11. Swift Trigger 113225: P60 Observations
  12. GRB 050401: Optical afterglow confirmed
  13. GRB050331: No Afterglow Detected
  14. GRB 050331: Swift UVOT Source
  15. Swift-BAT detection of GRB 050331
  16. GRB050319: radio observation
  17. GRB 050326: Early observations with Swift-UVOT
  18. GRB 050326 XMM-Newton observation
  19. GRB 050326: Swift XRT Position
  20. GRB 050326 BAT refined analysis
  21. GRB050326: delayed XRT observation
  22. GRB050319, optical observations
  23. GRB050319: optical observation, March 20-22
  24. GRB050319: RTT150 Optical Observations
  25. GRB 050318: Swift-BAT refined analysis
  26. GRB050319: VLA Observations
  27. GRB050319: radio observation
  28. GRB 050319: Swift-UVOT detection of the afterglow
  29. GRB 050315: Variability Analysis of Swift BAT Time History
  30. GRB050319: Radio Observations
  31. GRB 050319: NIR afterglow candidate
  32. GRB 050319:Near IR afterglow
  33. GRB 050318: SWIFT-UVOT refined analysis
  34. GRB 050319: Swift-BAT refined analysis
  35. GRB050319,optical observation
  36. GRB 050318: Swift/UVOT detection of afterglow emission
  37. RXTE Observations of GRB050318
  38. Swift-BAT detection of GRB 050318
  39. GRB050223: analysis of the XMM-Newton observation
  40. GRB050316: MASTER before, simultanious and follow up optical
  41. GRB 050306: ROTSE-III early limits
  42. GRB050316: MASTER optical observations
  43. GRB 050315 I-band observations
  44. GRB050315: Radio afterglow
  45. GRB 050315: Absorption redshift
  46. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  47. GRB 050315: Early Observations with Swift/UVOT
  48. Swift-BAT detection of GRB 050315
  49. GRB 050306: Radio Observations
  50. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  51. GRB 050306: optical afterglow
  52. GRB 050126: Redshift determination
  53. Swift-BAT trigger 107873: No Swift XRT counterpart
  54. GRB 050306: Confirmation of X-ray afterglow
  55. GRB 050306: further TAROT optical data
  56. GRB050309: Early optical limit from P60
  57. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  58. Swift 107873: P60 Optical Observations
  59. GRB 050306: R-band observations
  60. GRB 050306: REM optical-infrared observations
  61. GRB 050306: Possible X-ray Afterglow Position from the Swift
  62. GRB 050306: TAROT optical observations
  63. GRB 050306,optical observation
  64. GRB 050306: Swift-BAT detection of a long burst
  65. Ongoing activity of SGR 1806-20 after the giant flare
  66. GRB050215B: Late-Time Swift UVOT Observations
  67. PROMPT VRcIc Observations of GRB 050223
  68. XMM-Newton Images of GRB 050223
  69. GRB 050219b: candidate NIR afterglow
  70. Confirmed XRF nature for GRB050215b
  71. GRB 050223: optical observations
  72. GRB050223 XMM-Newton observation
  73. GRB050223: ROTSE-III Optical Observations
  74. GRB 050223 Swift/BAT detection of a burst
  75. GRB 050223: Swift XRT Position
  76. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  77. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  78. GRB 050219a: Optical observations from LCO
  79. GRB 050219b: Optical and near-IR observations from LCO
  80. GRB 050219b: Swift-BAT detection of a burst
  81. GRB 050219b: CORRECTION: Swift XRT Position
  82. GRB 050219b: Swift XRT Position
  83. GRB 050219a, optical observations
  84. GRB 050219: Swift-BAT detection of a burst
  85. GRB 050215b: XRT confirmation of IR afterglow candidate
  86. GRB050215b: P60 Optical Observations
  87. GRB 050215b: Swift XRT Source Variability
  88. GRB 050215B: candidate afterglow
  89. GRB 050215b, BOOTES-2 simultaneous optical observations
  90. GRB 050215b, BOOTES-1B optical limit
  91. GRB050215A: ROTSE-III Optical Observations
  92. GRB050209: TAROT optical observations
  93. GRB 050209(=U11568): Duration and spectrum
  94. short/hard GRB 050202, optical observations
  95. GRB050209: REM optical observations
  96. GRB 050209 I-band observation
  97. GRB 050209 Optical observations
  98. GRB050209: P60 Optical Observations
  99. GRB 050128: Radio observations
  100. GRB 050202: Short burst detected by Swift-BAT

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