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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"

26567 results found.

  1. GRB 100504A: Enhanced Swift-XRT position
  2. GRB 100504A: GROND Upper limits
  3. GRB 100504A: SARA-South Upper Limit
  4. GRB 100503A: Fermi GBM detection
  5. GRB 100504A: Swift detection of a burst
  6. INTEGRAL observations of Swift GRB trigger 421072
  7. GRB100423A : Suzaku WAM observation of the prompt emission
  8. Trigger 421072: Possible Swift detection of a GRB or transient
  9. GRB 100420A: Terskol optical upper limit
  10. GRB 100427A: Swift XRT and UVOT Upper Limits
  11. GRB 100427A: Fermi GBM detection
  12. GRB 100414A : EVLA Radio Detection
  13. GRB 100414A : WSRT Radio Detection
  14. Konus-Wind observation of GRB 100423A
  15. GRB 100423A: CrAO optical observations
  16. GRB 100418A: Terskol optical observations
  17. GRB 100424A: CrAO optical observations
  18. GRB 100424A: NIR Afterglow Confirmation
  19. GRB 100425A: Swift XRT refined analysis
  20. GRB 100424A: Gemini/NIRI H-band observations
  21. GRB100425A: Swift/UVOT Upper Limits
  22. GRB 100424A: Swift/UVOT Upper Limits
  23. GRB 100424A: Liverpool Telescope Upper Limits
  24. GRB 100425A: Enhanced Swift-XRT position
  25. GRB 100425A: Swift-BAT refined analysis
  26. GRB 100425A: GROND afterglow observation
  27. GRB 100424A: Gemini/NIRI Candidate Afterglow
  28. GRB 100424A: D50 optical limits
  29. GRB 100425A: candidate optical afterglow from the VLT
  30. GRB100424A: MITSuME optical upper limits
  31. GRB100423A: MITSuME optical upper limits
  32. GRB 100424A : Lulin early z'-band upper limit
  33. GRB 100424A: GROND Upper Limits
  34. GRB 100424A: PAIRITEL NIR Upper Limits
  35. GRB 100424A: Swift-XRT refined analysis
  36. GRB 100425A: Swift detection of a burst
  37. GRB 100424A: NOT optical observations
  38. GRB 100424A: Enhanced Swift-XRT position
  39. GRB 100424A: Swift detection of a burst
  40. GRB 100420A: GRT Optical Observation
  41. Swift Trigger 420256: D50 optical limits
  42. GRB 100423B: Fermi GBM detection
  43. Swift Trigger 420256: IAC80 R-band observations
  44. Swift Trigger 420256: BOOTES-2 observations
  45. Trigger 420256: Swift detection of a possible GRB
  46. GRB 100423A: GROND discovery of afterglow
  47. GRB100418A: REM possible afterglow detection
  48. GRB 100418A: Continuing Swift/UVOT Observations
  49. GRB100420A: MITSuME optical upper limits
  50. GRB 100414A: CFHT optical observations
  51. GRB 100420A: Swift/UVOT Upper Limits
  52. GRB 100420A: XRT refined analysis
  53. GRB 100420A: Enhanced Swift-XRT position
  54. GRB 100418A: SARA second epoch
  55. GRB 100420A: SARA Upper Limits
  56. GRB 100418A: RTT150 observations during the optical afterglow maximum
  57. GRB 100418A: optical observations
  58. GRB 100414A: Confirmation of the X-ray afterglow
  59. GRB 100418A: SMA submm detection
  60. GRB 100420A: Swift detection of a burst
  61. GRB 100418A: ROVOR optical afterglow detection
  62. GRB 100418A: Swift/UVOT Observations
  63. GRB 100418A: Gemini-N redshift confirmation
  64. GRB 100418A: Swift-XRT Refined Analysis
  65. GRB100418A: VLT/X-shooter redshift and photometry
  66. GRB 100418A: SARA observations
  67. GRB 100418A: GROND observations; missing author list added
  68. GRB 100418A: GROND observations
  69. GRB 100418A: Swift-BAT refined analysis
  70. GRB 100418A: Enhanced Swift-XRT position
  71. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  72. GRB 100414A: Suzaku WAM observation of the prompt emission
  73. GRB 100414A: Swift/UVOT Observations
  74. GRB 100414A: GROND Detection of the Optical Afterglow
  75. GRB 100414A: Gemini-N candidate and redshift
  76. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  77. GRB 100413A: Suzaku WAM observation of the prompt emission
  78. GRB 100414A: Palomar Transient Factory Observations
  79. GRB 100413B: Swift Confirmation of Burst
  80. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  81. GRB 100414A: Fermi GBM detection
  82. GRB100414A: Fermi LAT detection
  83. GRB 100413A: GROND Upper limits
  84. GRB 100413A: Swift/UVOT Upper Limits
  85. Konus-Wind observation of GRB 100413A
  86. GRB 100413A: Faulkes Telescope South observations
  87. Tentative redshift of GRB100413A from X-ray data
  88. GRB 100413A: SARA upper limit
  89. GRB 100413A: Swift-XRT Refined Analysis
  90. GRB 100413A: Enhanced Swift-XRT position
  91. GRB 100413A: Swift detection of a burst
  92. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  93. Trigger 419015 is probably not a GRB
  94. GRB100401A: GROND Upper Limits
  95. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  96. GRB 100331B: GROND Upper limits
  97. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  98. GRB 100401A: Fermi GBM detection
  99. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  100. GRB 100331B: BOOTES-3 observations

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