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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"

38670 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: VLT/X-shooter redshift
  16. GRB 100425A: GROND afterglow observation
  17. GRB 100424A: Gemini/NIRI Candidate Afterglow
  18. GRB 100425A: candidate optical afterglow from the VLT
  19. GRB100424A: MITSuME optical upper limits
  20. GRB100423A: MITSuME optical upper limits
  21. GRB 100424A : Lulin early z'-band upper limit
  22. GRB 100424A: GROND Upper Limits
  23. GRB 100424A: Swift-XRT refined analysis
  24. GRB 100425A: Swift detection of a burst
  25. GRB 100424A: WHT z-band observations
  26. GRB 100424A: NOT optical observations
  27. GRB 100424A: Enhanced Swift-XRT position
  28. GRB 100424A: Prompt enhanced Swift-XRT position.
  29. GRB 100424A: Swift detection of a burst
  30. GRB 100420A: GRT Optical Observation
  31. GRB 100418A: Possible Evidence for a Supernova
  32. GRB 100423B: Fermi GBM detection
  33. Swift Trigger 420256: IAC80 R-band observations
  34. Swift Trigger 420256: BOOTES-2 observations
  35. Swift Trigger 420256: ROTSE-III Optical Limits
  36. Trigger 420256: Swift detection of a possible GRB
  37. GRB 100423A: GROND discovery of afterglow
  38. GRB 100423A: Swift detection of a burst
  39. Radio afterglow detection of GRB 100418A with the EVLA
  40. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  41. GRB 100418A: Continued PAIRITEL NIR Observations
  42. GRB 100418A: WSRT Radio Detection
  43. GRB100418A: REM possible afterglow detection
  44. GRB 100418A: Continuing Swift/UVOT Observations
  45. GRB 100418A: further GROND observations and light curve fit
  46. GRB100420A: MITSuME optical upper limits
  47. GRB 100414A: CFHT optical observations
  48. GRB 100420A: Swift/UVOT Upper Limits
  49. GRB 100420A: XRT refined analysis
  50. GRB 100420A: Enhanced Swift-XRT position
  51. GRB 100418A: RTT150 observations during the optical afterglow maximum
  52. GRB 100418A: optical observations
  53. GRB 100418A: MASTER-Net optical observations
  54. GRB 100414A: Confirmation of the X-ray afterglow
  55. GRB 100418A: SMA submm detection
  56. GRB 100420A: ROTSE-III Optical Limits
  57. GRB 100420A: Swift detection of a burst
  58. GRB 100418A: ROVOR optical afterglow detection
  59. GRB 100418A: Swift/UVOT Observations
  60. GRB 100418A: Gemini-N redshift confirmation
  61. GRB 100413A: GMRT observation of radio afterglow
  62. GRB 100418A: Swift-XRT Refined Analysis
  63. GRB 100418A: host galaxy detection in the SDSS
  64. GRB100418A: VLT/X-shooter redshift and photometry
  65. GRB100414A: SAO RAS optical observations
  66. GRB 100418A: GROND observations; missing author list added
  67. GRB 100418A: GROND observations
  68. GRB 100418A: Enhanced Swift-XRT position
  69. GRB 100418A: ROTSE-III Optical Limits
  70. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  71. GRB 100413A: Radio Afterglow Detection with the EVLA
  72. GRB 100414A: Suzaku WAM observation of the prompt emission
  73. GRB 100414A: Swift/UVOT Observations
  74. GRB 100414A: Gemini-N observation (correction)
  75. GRB 100414A: GROND Detection of the Optical Afterglow
  76. GRB 100414A: Gemini-N candidate and redshift
  77. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  78. GRB 100413A: Suzaku WAM observation of the prompt emission
  79. GRB 100414A: Palomar Transient Factory Observations
  80. GRB 100413B: Swift Confirmation of Burst
  81. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  82. GRB 100414A: IPN Localization
  83. Konus-Wind observation of GRB 100414A (correction to GCN 10597)
  84. Konus-Wind observation of GRB 100414B
  85. GRB 100415A: MAXI/GSC detection of a probable GRB
  86. GRB 100414A: Fermi GBM detection
  87. GRB100414A: Fermi LAT detection
  88. GRB 100413B : Swift detection of a burst
  89. GRB 100413A: GROND Upper limits
  90. GRB 100413A: Swift/UVOT Upper Limits
  91. Konus-Wind observation of GRB 100413A
  92. GRB 100413A: Faulkes Telescope South observations
  93. Tentative redshift of GRB100413A from X-ray data
  94. GRB 100413A: SARA upper limit
  95. GRB 100413A: Swift-XRT Refined Analysis
  96. GRB 100413A: Enhanced Swift-XRT position
  97. GRB 100413: xinglong TNT optical upper limit
  98. GRB 100413A: MASTER-Net optical observations
  99. GRB 100413A: Swift detection of a burst
  100. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832

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