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"

37764 results found.

  1. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  2. GRB 101225A (Swift trigger 441015): optical upper limit
  3. Trigger 441015: Swift detection of a possible burst or transient
  4. GRB 101224A: NOT optical observation
  5. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  6. GRB 101224A: Swift/UVOT Upper Limits
  7. GRB 101224A: Fermi GBM observation
  8. GRB 101224A: Swift-XRT refined Analysis
  9. GRB101224A: MITSuME Okayama optical upper limits
  10. GRB 101224A, Swift-BAT refined analysis
  11. GRB 101224A - UVOT-enhanced XRT position
  12. GRB 101224A: Swift detection of a short burst
  13. GRB 101219A: Chandra Observations
  14. GRB 101219B: Swift/UVOT refined analysis
  15. GRB 101219B: Swift-XRT refined Analysis
  16. GRB 101219B: Enhanced Swift-XRT position
  17. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  18. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  19. GRB 101219B: Fermi GBM observation
  20. GRB 101219A: IAC80 optical observations
  21. GRB 101219B: Swift-BAT refined analysis
  22. GRB 101219A: Swift-XRT refined Analysis
  23. GRB 101219B: Swift detection of a burst with an optical afterglow
  24. GRB 101219A: Swift/UVOT Upper Limits
  25. GRB 101219A: GROND Upper limits
  26. Konus-Wind observation of short hard GRB 101219A
  27. GRB 101219A: Magellan NIR observations
  28. GRB 101219A: Further Gemini-South Imaging
  29. GRB 101219A: Swift-BAT refined analysis
  30. GRB 101219A - NOT observation - upper limit
  31. GRB 101219A: SARA-N Upper Limit
  32. GRB 101219A: Gemini-South observations
  33. GRB 101219A: REM optical and NIR observations
  34. GRB 101219A: ROTSE-III Optical Limits
  35. GRB 101219A: Swift detection of a short hard burst
  36. Request for Supernova related data for GRB 101023A
  37. GRB 101213A : Suzaku WAM observation of the prompt emission
  38. Redshift solution(s) for GRB101213A from Swift-XRT data
  39. Konus-Wind observation of GRB 101213A
  40. GRB 101213A: Fermi GBM observation
  41. GRB 101213A, Swift-BAT refined analysis
  42. GRB 101213A: Swift-XRT refined Analysis
  43. GRB 101213A: Swift/UVOT Upper Limits
  44. GRB 101213A: Enhanced Swift-XRT position
  45. GRB 101213: object within the X-ray error circle
  46. GRB 101213A: Swift detection of a burst
  47. GRB101204A: Swift/UVOT observations
  48. GRB 101204A: Swift-XRT refined Analysis
  49. GRB101204A GROND Detection of the Optical/NIR Afterglow
  50. GRB 101204A Afterglow Candidate, VATT Observations
  51. GRB 101129A : Suzaku WAM observation of the prompt emission
  52. GRB 101204A Swift-XRT/UVOT afterglow candidate
  53. Konus-Wind observation of GRB 101130A
  54. GRB 101204A detected in ground analysis of BAT data
  55. Konus-Wind observation of GRB 101129A
  56. IPN Localization of GRB101130 (possible short duration burst)
  57. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  58. GRB101030A
  59. GRB 101201A: Fermi GBM observation
  60. GRB 101201A: Swift-XRT refined Analysis
  61. GRB 101201A: Swift/UVOT Detection
  62. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  63. GRB 101201A detected in ground analysis of BAT data
  64. GRB 101123A: ROTSE optical observations
  65. GRB 101123A: MASTER prompt optical observations
  66. Konus-Wind observation of GRB 101123A
  67. IPN triangulation of bright GRB 101123A
  68. GRB 101123A: Fermi GBM detection
  69. Optical observation of GRB 101024A
  70. GRB 101117B: GROND Upper limits
  71. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  72. GRB 101112A: OSN and BTA observations
  73. GRB 101117B: Swift-XRT refined analysis
  74. GRB101114A: Swift/UVOT Upper Limits
  75. GRB 101114A: Confirmation of the X-ray afterglow
  76. GRB 101117B: Swift-BAT refined analysis
  77. GRB 101117B: Enhanced Swift-XRT position
  78. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  79. GRB 101117B: Swift detection of a burst
  80. GRB 101114A: GROND Upper limits
  81. Konus-Wind observation of GRB 101114A
  82. Fermi GBM detection of a burst from a galactic source
  83. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  84. GRB 101114A, Swift-BAT GRB detected by ground processing
  85. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  86. GRB 101112A: Fermi GBM detection
  87. GRB 101112A: optical observations
  88. GRB 10112A: MASTER optical observations
  89. Konus-Wind observation of GRB 101112A
  90. GRB 101112A - XRT source detection/analysis
  91. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  92. GRB101112A: Liverpool Telescope Afterglow Candidate
  93. GRB 101112A: a long GRB detected by INTEGRAL
  94. GRB 100906A: optical observations
  95. GRB 090113, the review of the sky area in plate archives
  96. GRB 101030A : MOA optical observation
  97. GRB 101030A: GROND optical/NIR afterglow candidate
  98. GRB 101030A : Swift XRT refined analysis
  99. GRB 101030A: Swift/UVOT Upper Limits
  100. GRB 101030A: Swift-BAT refined analysis

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