Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

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"

25891 results found.

  1. GRB 051117B: Swift detection of a burst
  2. GRB 051117: Swift detection of a bright burst
  3. GRB051114: results of the Swift-XRT observation
  4. GRB 051109B : Nainital upper limits
  5. GRB 051114: Swift-BAT refined analysis
  6. GRB050925: analysis of the XMM-Newton observation
  7. GRB051109A optical observations
  8. GRB 051114: Swift-BAT detection of a short burst
  9. GRB 051111: Radio afterglow
  10. GRB 051113: Swift-BAT refined analysis
  11. GRB 051113: Swift-BAT detection of a burst
  12. GRB 051111: AEOS optical observations
  13. GRB 051109A Milagro GeV/TeV Observations
  14. GRB/SGR 050925: XMM-Newton ToO observation
  15. GRB051111: Swift/UVOT Observations
  16. GRB 051111A : R-band temporal decay index based on Lulin
  17. GRB051111: XRT preliminary analysis
  18. GRB 051111: Swift-BAT refined analysis
  19. GRB 051109A Optical Observations
  20. GRB 051111A : Lulin BVRI multi band afterglow observation
  21. GRB051111a: SARA Observations
  22. GRB 051111A: KAIT optical observations
  23. GRB 051111a: Afterglow fading in Ic
  24. GRB051111: Super-LOTIS Early Detection
  25. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  26. Faulkes Telescope R-band detection of GRB051111
  27. GRB051111: Swift-BAT detection of a bright burst
  28. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  29. GRB 051008 Tautenburg Supernova Search
  30. GRB 051109B. Radio Observations
  31. GRB 051109A
  32. GRB 051109A: KAIT optical observations
  33. Early RAPTOR measurements of GRB 051109a - the movie.
  34. Konus-Wind observation of GRB 051109A
  35. GRB 051109B: Swift-BAT refined analysis
  36. GRB 051109B: ROTSE-III Optical Limits
  37. GRB 051109A: Swift-UVOT Observations
  38. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  39. GRB051109B: no UVOT source detected
  40. GRB051109B: XRT refined analysis
  41. GRB 051109B : Lulin Optical Observations
  42. GRB 051109A : Lulin BVRI Optical afterglow observation
  43. GRB051109A: further steepening in the X-ray light curve
  44. GRB051109A: XRT refined analysis
  45. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  46. GRB051109B: XRT position
  47. GRB 051109B: Super-LOTIS Observations
  48. GRB 051109B Kiso optical follow-up observation
  49. GRB 051109B: Swift detection of a burst
  50. GRB 051109: HET Optical Spectrum and Absorption Redshift
  51. GRB 051109: PROMPT Detections
  52. GRB 051109: Rc and Ic observations
  53. GRB051109: Early Super-LOTIS Detection
  54. GRB 051109: Swift-BAT refined analysis
  55. GRB 051109a: MDM Observations
  56. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  57. GRB051109: Swift detection of a burst
  58. GRB 051109a: IR Detections
  59. GRB 051109: ROTSE-III Detection of Possible Counterpart
  60. GRB051105B: Swift/XRT upper limit
  61. GRB051105B: Swift/UVOT upper limit
  62. GRB051028: Swift-XRT refined analysis
  63. GRB 051105A, 2nd epoch optical observations
  64. GRB 051105a: MDM Observations
  65. GRB 051105A: TNG optical observations
  66. GRB051105A: Swift/UVOT Observations
  67. GRB 051105A, radio observations
  68. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  69. GRB 051105A, optical observations
  70. XRT observations of GRB 051105A
  71. GRB 051105: Swift-BAT improved refined analysis
  72. GRB 051105b: ART optical limits
  73. GRB 051105: Swift-BAT refined analysis
  74. GRB 051105: Optical limit
  75. GRB 051105: Swift detection of a short burst
  76. GRB 051016B host spectroscopy and redshift
  77. GRB051016B: optical observation
  78. GRB 051022: RTT150 optical observations
  79. GRB051028: optical observations
  80. GRB051028: Swift/UVOT upper limits
  81. GRB051028: confirmation of the afterglow
  82. GRB051028: WHT optical candidate
  83. GRB051028: Swift XRT Position
  84. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  85. GRB051022: Swift XRT measurement of jet break
  86. GRB051021B: Swift/UVOT Upper limits
  87. GRB 051022: XRT Refined Spectral and Temporal Analysis
  88. GRB051012: Swift-XRT analysis
  89. GRB051021B: Swift XRT refined analysis
  90. GRB051021a: optical observations
  91. GRB 051022: WSRT Radio Detection
  92. GRB051022: host galaxy redshift
  93. GRB 051022: Swift/UVOT Upper Limits
  94. GRB051022: Radio Counterpart
  95. GRB051022: IR observations
  96. GRB 051022: SOAR JKs Observations
  97. GRB051021A: Swift XRT refined analysis
  98. GRB051022: Optical Observations
  99. GRB 051022: Magellan NIR imaging
  100. GRB 051021: PROMPT RcIc Observations

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov