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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"

21795 results found.

  1. Swift/UVOT UV Photometry of GRB 050820B
  2. GRB 050822: ROTSE-III Prompt Optical Limits
  3. GRB 050822: Swift detection of a long burst
  4. GRB050820a BVRcIc field photometry
  5. GRB050820B XMM-Newton observation
  6. GRB 050820B: Swift XRT position
  7. Swift/UVOT photometry of GRB050820
  8. GRB050820: refined XRT analysis
  9. GRB050819: refined XRT analysis
  10. GRB 050820: Swift detection of a GRB
  11. GRB050819: Swift-BAT detection of a weak burst
  12. GRB 050817: Optical observations
  13. GRB050817: Negative Optical Observations
  14. GRB 050814: continued fading
  15. GRB 050815: ROTSE-III Optical Limits
  16. GRB050815: Swift-BAT detection of a burst
  17. GRB050814: Fading red source
  18. GRB050814: P60 Optical Afterglow Candidate
  19. GRB 050813: Non-fading of afterglow candidate
  20. GRB 050814: XRT refined analysis
  21. GRB050814: SWIFT/UVOT observation
  22. GRB050814: Refined analysis of the Swift-BAT burst
  23. GRB 050814: Swift XRT Afterglow Localization
  24. GRB 050814: Swift detection of a burst
  25. GRB 050813: Magellan detection of a high redshift galaxy cluster
  26. GRB050813, SDSS pre-burst observations
  27. GRB050813: SWIFT/UVOT observation
  28. GRB 050813: Swift XRT afterglow localization
  29. RBO GRB 050714A and GRB 050716 observations
  30. GRB 050813: Possible Short Swift-BAT GRB
  31. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  32. Detection of an intermediate burst from SGR 1806-20 on August 8
  33. GRB 050730: WSRT Radio Observations
  34. GRB 050807: ROTSE-III Optical Limits
  35. GRB050805b: CrAO optical limit
  36. GRB050803, optical observations
  37. Retraction of Swift Trigger 149131 (GRB 050805B)
  38. GRB 050805b: OHP optical limits
  39. GRB 050805b: TAROT optical limits
  40. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  41. GRB050802: TNG optical observations
  42. GRB050803: Radio Observation
  43. GRB 050803: RTT150 optical observations
  44. GRB050801: Radio Observation
  45. GRB050730: Radio Detection
  46. GRB 050803: Keck Observations
  47. GRB 050803: Swift-BAT refined analysis
  48. GRB 050802.422: Fading of the afterglow and detection of the host
  49. GRB 050803: TAROT optical limits
  50. GRB050802 radio non-detection
  51. GRB 050730: OHP optical observations
  52. GRB 050802: Swift-BAT refined analysis
  53. GRB050801: Optical photometry and decay index
  54. GRB 050802: Swift Gamma-ray Burst
  55. GCN 050801: early Swift XRT analysis results
  56. GRB 050730: early TAROT optical observations
  57. GRB 050726: PROMPT Rc Observations
  58. GRB 050730, spectra and optical photometry
  59. GRB 050730 XMM-Newton observation
  60. GRB050730: Swift-BAT detection of a weak burst
  61. GRB 050709: PROMPT Rc Observations
  62. GRB 050724: WHT optical observations
  63. GRB050713: analysis of the XMM-Newton observation
  64. GRB050709: Second Epoch Chandra Observation
  65. GRB 050724: Optical Variability in Nearby Galaxy
  66. GRB 050724: J-band observations
  67. GRB 050724: GMOS Imaging and Spectroscopy
  68. RXTE ASM Detection of GRB050724
  69. GRB050724: Radio Observation
  70. GRB 050724: Swift/UVOT Upper Limit
  71. GRB 050724: possible host galaxy in DSS
  72. GRB 050721A: Swift-BAT refined analysis
  73. Correction to GCN Circ 3474 on GRB050525A
  74. GRB050721A: optical decay
  75. GRB 050721: optical afterglow confirmed
  76. GRB050721A: Swift-BAT detection of a weak burst
  77. GRB 050717: PROMPT RcIc Observations
  78. GRB050714b: Radio Observation
  79. GRB050712: Radio Observations
  80. GRB050713a: Radio Observation
  81. GRB 050712, Tautenburg optical afterglow observations
  82. Swift-BAT detection of a possible GRB
  83. GRB 050714B: VLT R-band observations
  84. GRB 050717: Additional LCO observations
  85. GRB050717
  86. GRB 050716; J-band observations
  87. Konus-Wind observation of GRB 050717
  88. GRB 050717: LCO near-IR observations
  89. Swift/UVOT Observations of GRB 050717
  90. GRB 050717: Swift-BAT refined analysis
  91. GRB050717: Swift XRT position
  92. Swift detection of GRB 050717
  93. Swift UVOT Observations of GRB 050716
  94. GRB 050716: Lulin B and R band optical observations
  95. GRB050716, optical observation
  96. GRB050716: Faulkes North Telescope observation
  97. Konus-Wind observation of GRB 050713A
  98. GRB 050714B: refined XRT analysis
  99. GRB 050713b: RTT150 optical observations
  100. GRB 050714B: optical afterglow

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