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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"

28264 results found.

  1. Trigger 421072: Possible Swift detection of a GRB or transient
  2. GRB 100420A: Terskol optical upper limit
  3. GRB 100427A: Swift XRT and UVOT Upper Limits
  4. GRB 100427A: Fermi GBM detection
  5. GRB 100414A : EVLA Radio Detection
  6. GRB 100414A : WSRT Radio Detection
  7. GRB 100423A: CrAO optical observations
  8. GRB 100418A: Terskol optical observations
  9. GRB 100424A: CrAO optical observations
  10. GRB 100424A: NIR Afterglow Confirmation
  11. GRB 100425A: Swift XRT refined analysis
  12. GRB 100424A: Gemini/NIRI H-band observations
  13. GRB100425A: Swift/UVOT Upper Limits
  14. GRB 100424A: Swift/UVOT Upper Limits
  15. GRB 100424A: Liverpool Telescope Upper Limits
  16. GRB 100425A: Enhanced Swift-XRT position
  17. GRB 100425A: Swift-BAT refined analysis
  18. GRB 100425A: GROND afterglow observation
  19. GRB 100424A: Gemini/NIRI Candidate Afterglow
  20. GRB 100424A: D50 optical limits
  21. GRB 100425A: candidate optical afterglow from the VLT
  22. GRB100424A: MITSuME optical upper limits
  23. GRB100423A: MITSuME optical upper limits
  24. GRB 100424A : Lulin early z'-band upper limit
  25. GRB 100424A: GROND Upper Limits
  26. GRB 100424A: PAIRITEL NIR Upper Limits
  27. GRB 100424A: Swift-XRT refined analysis
  28. GRB 100425A: Swift detection of a burst
  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. Swift Trigger 420256: D50 optical limits
  36. GRB 100423B: Fermi GBM detection
  37. GRB 100423A: Swift-BAT refined analysis
  38. Swift Trigger 420256: IAC80 R-band observations
  39. Swift Trigger 420256: BOOTES-2 observations
  40. Trigger 420256: Swift detection of a possible GRB
  41. GRB 100423A: GROND discovery of afterglow
  42. GRB 100418A: Continued PAIRITEL NIR Observations
  43. GRB100418A: REM possible afterglow detection
  44. GRB 100418A: Continuing Swift/UVOT Observations
  45. GRB100420A: MITSuME optical upper limits
  46. GRB 100414A: CFHT optical observations
  47. GRB 100420A: Swift/UVOT Upper Limits
  48. GRB 100420A: XRT refined analysis
  49. GRB 100420A: Enhanced Swift-XRT position
  50. GRB 100418A: SARA second epoch
  51. GRB 100420A: SARA Upper Limits
  52. GRB 100418A: optical observations
  53. GRB 100414A: Confirmation of the X-ray afterglow
  54. GRB 100418A: SMA submm detection
  55. GRB 100420A: Swift detection of a burst
  56. GRB 100418A PAIRITEL NIR Observations
  57. GRB 100418A: Swift/UVOT Observations
  58. GRB 100418A: Gemini-N redshift confirmation
  59. GRB 100418A: Swift-XRT Refined Analysis
  60. GRB100418A: VLT/X-shooter redshift and photometry
  61. GRB 100418A: SARA observations
  62. GRB 100418A: GROND observations; missing author list added
  63. GRB 100418A: GROND observations
  64. GRB 100418A: Swift-BAT refined analysis
  65. GRB 100418A: Enhanced Swift-XRT position
  66. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  67. GRB 100413A: Radio Afterglow Detection with the EVLA
  68. GRB 100414A: Suzaku WAM observation of the prompt emission
  69. GRB 100414A: Swift/UVOT Observations
  70. GRB 100414A: GROND Detection of the Optical Afterglow
  71. GRB 100414A: Gemini-N candidate and redshift
  72. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  73. GRB 100413A: Suzaku WAM observation of the prompt emission
  74. GRB 100414A: Palomar Transient Factory Observations
  75. GRB 100413B: Swift Confirmation of Burst
  76. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  77. GRB 100413A: Swift-BAT final refined analysis
  78. GRB 100414A: Fermi GBM detection
  79. GRB100414A: Fermi LAT detection
  80. GRB 100413A: GROND Upper limits
  81. GRB 100413A: Swift/UVOT Upper Limits
  82. Konus-Wind observation of GRB 100413A
  83. GRB 100413A: Faulkes Telescope South observations
  84. GRB 100413A: SARA upper limit
  85. GRB 100413A: Swift-XRT Refined Analysis
  86. GRB 100413A: Swift-BAT initial refined analysis
  87. GRB 100413A: Enhanced Swift-XRT position
  88. GRB 100413A: Swift detection of a burst
  89. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  90. Trigger 419015 is probably not a GRB
  91. GRB100401A: GROND Upper Limits
  92. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  93. GRB 100331B: GROND Upper limits
  94. GRB 100401A: Fermi GBM detection
  95. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  96. GRB 100331B: BOOTES-3 observations
  97. GRB 100324B: Suzaku WAM observation of the prompt emission
  98. GRB 100331B: Swift/UVOT Upper Limits
  99. GRB 100331B: Swift/XRT possible afterglow candidate
  100. Swift detection of LS V +44 17

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