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"

27225 results found.

  1. An extraordinary long burst on December 3 from SGR1806-20
  2. Swift UVOT Calibration Documentation
  3. Swift-BAT trigger 165579 is not a GRB
  4. GRB 051127: Swift-BAT detection of a possible burst
  5. GRB051117B: Swift XRT refined analysis
  6. GRB051117b: No Swift/UVOT Detection
  7. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  8. GRB 051117A: Swift/UVOT Detection of an Afterglow
  9. GRB051111: Rc optical observations
  10. GRB051008: Suzaku WAM observation of the prompt emission
  11. GRB 051109A : GAO 150cm telescope Rc-band detection
  12. GRB 051117B: MARGE Optical Limits
  13. GRB 051117B: R and I observations of possible host galaxy
  14. GRB 051117A: Refined analysis of the Swift-BAT burst
  15. GRB 051117B: Refined analysis of the Swift-BAT burst
  16. GRB051117A : XRT refined analysis
  17. GRB 051117B,optical observation
  18. GRB 051117B: Lulin R and I band observation
  19. GRB 051117B: Optical observations
  20. GRB 051117B: ROTSE-III Optical Limits
  21. GRB051117B: Swift XRT position
  22. GRB 051117B: Swift detection of a burst
  23. GRB 051117: Swift detection of a bright burst
  24. GRB051114: results of the Swift-XRT observation
  25. GRB 051114: Swift-BAT refined analysis
  26. GRB050925: analysis of the XMM-Newton observation
  27. GRB 051114: Swift-BAT detection of a short burst
  28. GRB 051113: Swift-BAT refined analysis
  29. GRB 051113: Swift-BAT detection of a burst
  30. GRB 051111: AEOS optical observations
  31. GRB 051109A Milagro GeV/TeV Observations
  32. GRB/SGR 050925: XMM-Newton ToO observation
  33. GRB051111: Swift/UVOT Observations
  34. GRB051111: XRT preliminary analysis
  35. GRB 051111: Swift-BAT refined analysis
  36. GRB 051109A Optical Observations
  37. GRB051111a: SARA Observations
  38. GRB 051111A: KAIT optical observations
  39. GRB051111: Super-LOTIS Early Detection
  40. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  41. Faulkes Telescope R-band detection of GRB051111
  42. GRB051111: Swift-BAT detection of a bright burst
  43. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  44. GRB051109A - radio observations
  45. Early RAPTOR measurements of GRB 051109a - the movie.
  46. Konus-Wind observation of GRB 051109A
  47. GRB 051109B: Swift-BAT refined analysis
  48. GRB 051109B: ROTSE-III Optical Limits
  49. GRB 051109A: Swift-UVOT Observations
  50. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  51. GRB051109B: no UVOT source detected
  52. GRB051109B: XRT refined analysis
  53. GRB 051109B : Lulin Optical Observations
  54. GRB051109A: further steepening in the X-ray light curve
  55. GRB051109A: XRT refined analysis
  56. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  57. GRB051109B: XRT position
  58. GRB 051109B: Super-LOTIS Observations
  59. GRB 051109B Kiso optical follow-up observation
  60. GRB 051109B: Swift detection of a burst
  61. GRB051109: Early Super-LOTIS Detection
  62. GRB 051109: Swift-BAT refined analysis
  63. GRB 051109a: MDM Observations
  64. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  65. GRB051109: Swift detection of a burst
  66. GRB 051109a: IR Detections
  67. GRB 051109: ROTSE-III Detection of Possible Counterpart
  68. GRB051105B: Swift/XRT upper limit
  69. GRB051105B: Swift/UVOT upper limit
  70. GRB051028: Swift-XRT refined analysis
  71. GRB 051105A, 2nd epoch optical observations
  72. GRB 051105a: MDM Observations
  73. GRB 051105A: TNG optical observations
  74. GRB051105A: Swift/UVOT Observations
  75. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  76. XRT observations of GRB 051105A
  77. GRB 051105: Swift-BAT improved refined analysis
  78. GRB 051105: Swift-BAT refined analysis
  79. GRB 051105: Swift detection of a short burst
  80. GRB051028: Swift/UVOT upper limits
  81. GRB051028: Swift XRT Position
  82. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  83. GRB051022: Swift XRT measurement of jet break
  84. GRB051021B: Swift/UVOT Upper limits
  85. GRB 051022: XRT Refined Spectral and Temporal Analysis
  86. GRB051012: Swift-XRT analysis
  87. GRB051021B: Swift XRT refined analysis
  88. GRB 051022: WSRT Radio Detection
  89. GRB 051022: Swift/UVOT Upper Limits
  90. GRB051021A: Swift XRT refined analysis
  91. GRB051022: Optical Observations
  92. GRB051021b: Magellan IR Imaging
  93. GRB 051022, J & K-band observation
  94. GRB 051021, SMARTS optical/IR observations
  95. GRB051022: Swift XRT Position
  96. GRB 051021: P200 Ks Observations
  97. GRB 051021: MDM Upper Limit
  98. GRB051021: Swift/UVOT Upper Limits
  99. GRB 051021B: Refined analysis of the Swift-BAT burst
  100. GRB051021B: Swift XRT Position

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