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"

32770 results found.

  1. GRB 051211: Swift XRT upper limit
  2. HETE SXC localization of GRB 051211 (=H3979)
  3. GRB 051210: SALT detection limit
  4. GRB 051210: Swift XRT refined analysis
  5. GRB 051210: FRAM early limit
  6. GRB 051210: Swift-BAT refined analysis of a short burst
  7. GRB051210: Swift UVOT Observation
  8. GRB 051210: A short GRB in a cluster?
  9. IPN observations of SGR1806-20
  10. Swift XRT positions
  11. An extraordinary long burst on December 3 from SGR1806-20
  12. GRB051117B: optical observation
  13. GRB051111: optical observaion
  14. Swift-BAT trigger 165579 is not a GRB
  15. GRB051117b: No Swift/UVOT Detection
  16. GRB051111: Rc optical observations: correction
  17. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  18. GRB 051117A: Swift/UVOT Detection of an Afterglow
  19. GRB051111: Rc optical observations
  20. GRB051008: Suzaku WAM observation of the prompt emission
  21. GRB 051109B: GAO 150cm telescope Optical limit
  22. GRB 051109A : GAO 150cm telescope Rc-band detection
  23. GRB 051021 Optical Observations
  24. GRB 051117B: MARGE Optical Limits
  25. GRB 051117A and B: Radio Observations
  26. GRB 051117B: R and I observations of possible host galaxy
  27. GRB 051117b: NIR observations
  28. GRB 051117A: Refined analysis of the Swift-BAT burst
  29. GRB 051117B: Refined analysis of the Swift-BAT burst
  30. GRB051117A : XRT refined analysis
  31. GRB 051117B: Lulin R and I band observation
  32. GRB 051117B: Optical observations
  33. GRB 051117B: ROTSE-III Optical Limits
  34. GRB051114: results of the Swift-XRT observation
  35. GRB 051028 Optical Observations
  36. GRB 051109B : Nainital upper limits
  37. GRB 051114: Radio Observations
  38. GRB 051114: Swift-BAT refined analysis
  39. GRB 051114: Swift-BAT detection of a short burst
  40. GRB 051111: Further spectroscopic analysis
  41. GRB 051111: Radio afterglow
  42. GRB 051113: Swift-BAT refined analysis
  43. GRB051103: Radio Observations
  44. GRB 051109A Milagro GeV/TeV Observations
  45. GRB/SGR 050925: XMM-Newton ToO observation
  46. GRB051111: Swift/UVOT Observations
  47. GRB 051111A : R-band temporal decay index based on Lulin
  48. GRB051111: XRT preliminary analysis
  49. GRB 051111: Swift-BAT refined analysis
  50. GRB 051109A Optical Observations
  51. GRB051111a: SARA Observations
  52. GRB 051111a: IR photometry
  53. GRB 051111A: KAIT optical observations
  54. GRB 051111a: Afterglow fading in Ic
  55. GRB051111: Super-LOTIS Early Detection
  56. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  57. GRB 051103 Milagro GeV/TeV Observations
  58. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  59. GRB 051008 Tautenburg Supernova Search
  60. GRB 051109B. Radio Observations
  61. GRB 051109A
  62. GRB051109A - radio observations
  63. GRB 051105a: GETS optical limit
  64. GRB 051109b: GETS observation
  65. GRB 051109A: KAIT optical observations
  66. Early RAPTOR measurements of GRB 051109a - the movie.
  67. Konus-Wind observation of GRB 051109A
  68. GRB 051109B: Swift-BAT refined analysis
  69. GRB 051109B: ROTSE-III Optical Limits
  70. GRB 051109A: Swift-UVOT Observations
  71. GRB051109B: no UVOT source detected
  72. GRB051109B: XRT refined analysis
  73. GRB 051109B : Lulin Optical Observations
  74. GRB051109A: further steepening in the X-ray light curve
  75. GRB051109A: XRT refined analysis
  76. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  77. GRB051109B: XRT position
  78. GRB 051109B Kiso optical follow-up observation
  79. GRB 051109: HET Optical Spectrum and Absorption Redshift
  80. GRB 051109: PROMPT Detections
  81. GRB 051109: Rc and Ic observations
  82. GRB051109: Early Super-LOTIS Detection
  83. GRB 051109: Swift-BAT refined analysis
  84. GRB 051109a: MDM Observations
  85. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  86. GRB051109: Swift detection of a burst
  87. GRB 051109a: IR Detections
  88. GRB 051109: ROTSE-III Detection of Possible Counterpart
  89. GRB051105B: Swift/XRT upper limit
  90. GRB051105B: Swift/UVOT upper limit
  91. GRB051103: optical observations
  92. GRB 051103, optical observations
  93. GRB051103: MASTER: OT limit and host galaxy candidates
  94. GRB051028: Swift-XRT refined analysis
  95. GRB 051105a, observation from Naini Tal and OSN
  96. GRB 051105A, 2nd epoch optical observations
  97. GRB 051105a: MDM Observations
  98. GRB 051105A: TNG optical observations
  99. GRB051105A: Swift/UVOT Observations
  100. GRB 051105A, radio observations

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