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"

45779 results found.

  1. GRB 100427A detected in ground analysis of Swift BAT data
  2. GRB 100414A : EVLA Radio Detection
  3. GRB 100414A : WSRT Radio Detection
  4. Konus-Wind observation of GRB 100423A
  5. GRB 100423A: CrAO optical observations
  6. GRB 100418A: Terskol optical observations
  7. GRB 100424A: CrAO optical observations
  8. GRB 100424A: NIR Afterglow Confirmation
  9. GRB 100425A: Swift XRT refined analysis
  10. GRB 100424A: Gemini/NIRI H-band observations
  11. GRB100425A: Swift/UVOT Upper Limits
  12. GRB 100424A: Swift/UVOT Upper Limits
  13. GRB 100424A: Liverpool Telescope Upper Limits
  14. GRB 100425A: Enhanced Swift-XRT position
  15. GRB 100425A: Swift-BAT refined analysis
  16. GRB 100425A: VLT/X-shooter redshift
  17. GRB 100425A: GROND afterglow observation
  18. GRB 100424A: Gemini/NIRI Candidate Afterglow
  19. GRB 100424A: D50 optical limits
  20. GRB 100425A: candidate optical afterglow from the VLT
  21. GRB100424A: MITSuME optical upper limits
  22. GRB100423A: MITSuME optical upper limits
  23. GRB 100424A : Lulin early z'-band upper limit
  24. GRB 100424A: GROND Upper Limits
  25. GRB 100424A: PAIRITEL NIR Upper Limits
  26. GRB 100424A: Swift-XRT refined analysis
  27. GRB 100425A: Swift detection of a burst
  28. GRB 100424A: WHT z-band observations
  29. GRB 100424A: NOT optical observations
  30. GRB 100424A, Swift-BAT refined analysis
  31. GRB 100424A: Enhanced Swift-XRT position
  32. GRB 100424A: Prompt enhanced Swift-XRT position.
  33. GRB 100424A: Swift detection of a burst
  34. GRB 100420A: GRT Optical Observation
  35. GRB 100418A: ROVOR optical measurements at 35 hours
  36. Swift-BAT refined analysis of trigger 420256
  37. Swift Trigger 420256: D50 optical limits
  38. GRB 100418A: Possible Evidence for a Supernova
  39. GRB 100420A: Swift-BAT refined analysis
  40. GRB 100423B: Fermi GBM detection
  41. GRB 100423A: Swift-BAT refined analysis
  42. Swift Trigger 420256: IAC80 R-band observations
  43. Swift Trigger 420256: BOOTES-2 observations
  44. Swift Trigger 420256: ROTSE-III Optical Limits
  45. Trigger 420256: Swift detection of a possible GRB
  46. GRB 100423A: Skynet/PROMPT Detections
  47. GRB 100423A: GROND discovery of afterglow
  48. GRB 100423A: Swift detection of a burst
  49. Radio afterglow detection of GRB 100418A with the EVLA
  50. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  51. GRB 100418A: Continued PAIRITEL NIR Observations
  52. GRB 100418A: WSRT Radio Detection
  53. GRB100418A: REM possible afterglow detection
  54. GRB 100418A: Continuing Swift/UVOT Observations
  55. GRB 100418A: further GROND observations and light curve fit
  56. GRB 100418A: RTT150 optical observations
  57. GRB100420A: MITSuME optical upper limits
  58. GRB 100414A: CFHT optical observations
  59. GRB 100420A: Swift/UVOT Upper Limits
  60. GRB 100420A: XRT refined analysis
  61. GRB 100420A: Enhanced Swift-XRT position
  62. GRB 100418A: SARA second epoch
  63. GRB 100420A: SARA Upper Limits
  64. GRB 100418A: RTT150 observations during the optical afterglow maximum
  65. GRB 100418A: optical observations
  66. GRB 100418A: MASTER-Net optical observations
  67. GRB 100414A: Confirmation of the X-ray afterglow
  68. GRB 100418A: VLT optical observations
  69. GRB 100418A: SMA submm detection
  70. GRB 100420A: ROTSE-III Optical Limits
  71. GRB 100420A: Swift detection of a burst
  72. GRB 100418A PAIRITEL NIR Observations
  73. GRB 100418A: ROVOR optical afterglow detection
  74. GRB 100418A: Swift/UVOT Observations
  75. GRB 100418A: Gemini-N redshift confirmation
  76. GRB 100413A: GMRT observation of radio afterglow
  77. GRB 100418A: Swift-XRT Refined Analysis
  78. GRB 100418A: host galaxy detection in the SDSS
  79. GRB100418A: VLT/X-shooter redshift and photometry
  80. GRB 100418A: SARA observations
  81. GRB100414A: SAO RAS optical observations
  82. GRB 100418A: GROND observations; missing author list added
  83. GRB 100418A: GROND observations
  84. GRB 100418A: Swift-BAT refined analysis
  85. GRB 100418A: Enhanced Swift-XRT position
  86. GRB 100418A: ROTSE-III Optical Limits
  87. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  88. GRB 100413A: Radio Afterglow Detection with the EVLA
  89. GRB 100414A: Suzaku WAM observation of the prompt emission
  90. GRB 100414A: Swift/UVOT Observations
  91. GRB 100414A: Gemini-N observation (correction)
  92. GRB 100414A: GROND Detection of the Optical Afterglow
  93. GRB 100414A: Gemini-N candidate and redshift
  94. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  95. GRB 100413A: Suzaku WAM observation of the prompt emission
  96. GRB 100414A: Palomar Transient Factory Observations
  97. GRB 100413B: Swift Confirmation of Burst
  98. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  99. GRB 100413A: Swift-BAT final refined analysis
  100. GRB 100414A: IPN Localization

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