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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"

26664 results found.

  1. GRB 100503A: Fermi GBM detection
  2. GRB 100504A: Swift detection of a burst
  3. INTEGRAL observations of Swift GRB trigger 421072
  4. GRB100423A : Suzaku WAM observation of the prompt emission
  5. Trigger 421072: Possible Swift detection of a GRB or transient
  6. GRB 100420A: Terskol optical upper limit
  7. GRB 100427A: Swift XRT and UVOT Upper Limits
  8. GRB 100427A: Fermi GBM detection
  9. GRB 100414A : EVLA Radio Detection
  10. GRB 100414A : WSRT Radio Detection
  11. Konus-Wind observation of GRB 100423A
  12. GRB 100423A: CrAO optical observations
  13. GRB 100418A: Terskol optical observations
  14. GRB 100424A: CrAO optical observations
  15. GRB 100424A: NIR Afterglow Confirmation
  16. GRB 100425A: Swift XRT refined analysis
  17. GRB 100424A: Gemini/NIRI H-band observations
  18. GRB100425A: Swift/UVOT Upper Limits
  19. GRB 100424A: Swift/UVOT Upper Limits
  20. GRB 100424A: Liverpool Telescope Upper Limits
  21. GRB 100425A: Enhanced Swift-XRT position
  22. GRB 100425A: Swift-BAT refined analysis
  23. GRB 100425A: GROND afterglow observation
  24. GRB 100424A: Gemini/NIRI Candidate Afterglow
  25. GRB 100424A: D50 optical limits
  26. GRB 100425A: candidate optical afterglow from the VLT
  27. GRB100424A: MITSuME optical upper limits
  28. GRB100423A: MITSuME optical upper limits
  29. GRB 100424A : Lulin early z'-band upper limit
  30. GRB 100424A: GROND Upper Limits
  31. GRB 100424A: PAIRITEL NIR Upper Limits
  32. GRB 100424A: Swift-XRT refined analysis
  33. GRB 100425A: Swift detection of a burst
  34. GRB 100424A: NOT optical observations
  35. GRB 100424A: Enhanced Swift-XRT position
  36. GRB 100424A: Swift detection of a burst
  37. GRB 100420A: GRT Optical Observation
  38. Swift Trigger 420256: D50 optical limits
  39. GRB 100423B: Fermi GBM detection
  40. Swift Trigger 420256: IAC80 R-band observations
  41. Swift Trigger 420256: BOOTES-2 observations
  42. Trigger 420256: Swift detection of a possible GRB
  43. GRB 100423A: GROND discovery of afterglow
  44. GRB100418A: REM possible afterglow detection
  45. GRB 100418A: Continuing Swift/UVOT Observations
  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: SARA second epoch
  52. GRB 100420A: SARA Upper Limits
  53. GRB 100418A: RTT150 observations during the optical afterglow maximum
  54. GRB 100418A: optical observations
  55. GRB 100414A: Confirmation of the X-ray afterglow
  56. GRB 100418A: SMA submm detection
  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 100418A: Swift-XRT Refined Analysis
  62. GRB100418A: VLT/X-shooter redshift and photometry
  63. GRB 100418A: SARA observations
  64. GRB 100418A: GROND observations; missing author list added
  65. GRB 100418A: GROND observations
  66. GRB 100418A: Swift-BAT refined analysis
  67. GRB 100418A: Enhanced Swift-XRT position
  68. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  69. GRB 100414A: Suzaku WAM observation of the prompt emission
  70. GRB 100414A: Swift/UVOT Observations
  71. GRB 100414A: GROND Detection of the Optical Afterglow
  72. GRB 100414A: Gemini-N candidate and redshift
  73. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  74. GRB 100413A: Suzaku WAM observation of the prompt emission
  75. GRB 100414A: Palomar Transient Factory Observations
  76. GRB 100413B: Swift Confirmation of Burst
  77. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  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. Tentative redshift of GRB100413A from X-ray data
  85. GRB 100413A: SARA upper limit
  86. GRB 100413A: Swift-XRT 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. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  95. GRB 100401A: Fermi GBM detection
  96. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  97. GRB 100331B: BOOTES-3 observations
  98. GRB 100324B: Suzaku WAM observation of the prompt emission
  99. GRB 100331B: Swift/UVOT Upper Limits
  100. GRB 100331B: Swift/XRT possible afterglow candidate

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