Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32764 results found.

  1. GRB051210: Swift UVOT Observation
  2. GRB 051210: A short GRB in a cluster?
  3. IPN observations of SGR1806-20
  4. Swift XRT positions
  5. An extraordinary long burst on December 3 from SGR1806-20
  6. GRB051117B: optical observation
  7. GRB051111: optical observaion
  8. Swift-BAT trigger 165579 is not a GRB
  9. GRB051117b: No Swift/UVOT Detection
  10. GRB051111: Rc optical observations: correction
  11. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  12. GRB 051117A: Swift/UVOT Detection of an Afterglow
  13. GRB051111: Rc optical observations
  14. GRB051008: Suzaku WAM observation of the prompt emission
  15. GRB 051109B: GAO 150cm telescope Optical limit
  16. GRB 051109A : GAO 150cm telescope Rc-band detection
  17. GRB 051021 Optical Observations
  18. GRB 051117B: MARGE Optical Limits
  19. GRB 051117A and B: Radio Observations
  20. GRB 051117B: R and I observations of possible host galaxy
  21. GRB 051117b: NIR observations
  22. GRB 051117A: Refined analysis of the Swift-BAT burst
  23. GRB 051117B: Refined analysis of the Swift-BAT burst
  24. GRB051117A : XRT refined analysis
  25. GRB 051117B: Lulin R and I band observation
  26. GRB 051117B: Optical observations
  27. GRB 051117B: ROTSE-III Optical Limits
  28. GRB051114: results of the Swift-XRT observation
  29. GRB 051028 Optical Observations
  30. GRB 051109B : Nainital upper limits
  31. GRB 051114: Radio Observations
  32. GRB 051114: Swift-BAT refined analysis
  33. GRB 051114: Swift-BAT detection of a short burst
  34. GRB 051111: Further spectroscopic analysis
  35. GRB 051111: Radio afterglow
  36. GRB 051113: Swift-BAT refined analysis
  37. GRB051103: Radio Observations
  38. GRB 051109A Milagro GeV/TeV Observations
  39. GRB/SGR 050925: XMM-Newton ToO observation
  40. GRB051111: Swift/UVOT Observations
  41. GRB 051111A : R-band temporal decay index based on Lulin
  42. GRB051111: XRT preliminary analysis
  43. GRB 051111: Swift-BAT refined analysis
  44. GRB 051109A Optical Observations
  45. GRB051111a: SARA Observations
  46. GRB 051111a: IR photometry
  47. GRB 051111A: KAIT optical observations
  48. GRB 051111a: Afterglow fading in Ic
  49. GRB051111: Super-LOTIS Early Detection
  50. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  51. GRB 051103 Milagro GeV/TeV Observations
  52. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  53. GRB 051008 Tautenburg Supernova Search
  54. GRB 051109B. Radio Observations
  55. GRB 051109A
  56. GRB051109A - radio observations
  57. GRB 051105a: GETS optical limit
  58. GRB 051109b: GETS observation
  59. GRB 051109A: KAIT optical observations
  60. Early RAPTOR measurements of GRB 051109a - the movie.
  61. Konus-Wind observation of GRB 051109A
  62. GRB 051109B: Swift-BAT refined analysis
  63. GRB 051109B: ROTSE-III Optical Limits
  64. GRB 051109A: Swift-UVOT Observations
  65. GRB051109B: no UVOT source detected
  66. GRB051109B: XRT refined analysis
  67. GRB 051109B : Lulin Optical Observations
  68. GRB051109A: further steepening in the X-ray light curve
  69. GRB051109A: XRT refined analysis
  70. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  71. GRB051109B: XRT position
  72. GRB 051109B Kiso optical follow-up observation
  73. GRB 051109: HET Optical Spectrum and Absorption Redshift
  74. GRB 051109: PROMPT Detections
  75. GRB 051109: Rc and Ic observations
  76. GRB051109: Early Super-LOTIS Detection
  77. GRB 051109: Swift-BAT refined analysis
  78. GRB 051109a: MDM Observations
  79. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  80. GRB051109: Swift detection of a burst
  81. GRB 051109a: IR Detections
  82. GRB 051109: ROTSE-III Detection of Possible Counterpart
  83. GRB051105B: Swift/XRT upper limit
  84. GRB051105B: Swift/UVOT upper limit
  85. GRB051103: optical observations
  86. GRB 051103, optical observations
  87. GRB051103: MASTER: OT limit and host galaxy candidates
  88. GRB051028: Swift-XRT refined analysis
  89. GRB 051105a, observation from Naini Tal and OSN
  90. GRB 051105A, 2nd epoch optical observations
  91. GRB 051105a: MDM Observations
  92. GRB 051105A: TNG optical observations
  93. GRB051105A: Swift/UVOT Observations
  94. GRB 051105A, radio observations
  95. GRB051103:_MASTER_optical_observations
  96. GRB 051105A, optical observations
  97. XRT observations of GRB 051105A
  98. GRB 051105: Swift-BAT improved refined analysis
  99. GRB 051105: Swift-BAT refined analysis
  100. GRB 051105: Optical limit

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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