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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"

23460 results found.

  1. Swift-BAT trigger 421695 is likely not astrophysical
  2. GRB100504A: Optical upper limits at IAO
  3. GRB 100511A, RIMOTS optical upper limits
  4. Trigger 421695: Swift detection of a possible burst
  5. GRB100508A: Further Swift/UVOT Observations
  6. GRB 100508A: GROND Detection of the optical afterglow
  7. GRB 100508A: Swift-BAT refined analysis
  8. GRB 100508A: Enhanced Swift-XRT position
  9. GRB100508A: Swift/UVOT Detection of the Afterglow
  10. GRB 100508A: ROTSE-III Optical Limits
  11. GRB 100508A: Swift detection of a burst
  12. GRB 100418A: Keck imaging
  13. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  14. GRB 100504A: Swift/UVOT Observations
  15. GRB 100504A: Swift-XRT refined analysis
  16. GRB 100504A: Enhanced Swift-XRT position
  17. GRB 100504A: GROND Upper limits
  18. GRB 100504A: SARA-South Upper Limit
  19. GRB 100503A: Fermi GBM detection
  20. GRB 100504A: Swift detection of a burst
  21. INTEGRAL observations of Swift GRB trigger 421072
  22. Trigger 421072: Possible Swift detection of a GRB or transient
  23. GRB 100420A: EVLA radio observations
  24. GRB 100420A: Gemini discovery of infrared afterglow
  25. GRB 100423A: xinglong TNT optical upper limit
  26. GRB 100420A: Terskol optical upper limit
  27. GRB 100427A: Swift XRT and UVOT Upper Limits
  28. GRB 100424a. Radio observations
  29. GRB 100427A detected in ground analysis of Swift BAT data
  30. GRB 100414A : EVLA Radio Detection
  31. GRB 100414A : WSRT Radio Detection
  32. GRB 100423A: CrAO optical observations
  33. GRB 100418A: Terskol optical observations
  34. GRB 100424A: CrAO optical observations
  35. GRB 100424A: NIR Afterglow Confirmation
  36. GRB 100424A: Gemini/NIRI H-band observations
  37. GRB100425A: Swift/UVOT Upper Limits
  38. GRB 100424A: Swift/UVOT Upper Limits
  39. GRB 100424A: Liverpool Telescope Upper Limits
  40. GRB 100425A: Enhanced Swift-XRT position
  41. GRB 100425A: GROND afterglow observation
  42. GRB 100424A: Gemini/NIRI Candidate Afterglow
  43. GRB 100424A: D50 optical limits
  44. GRB 100425A: candidate optical afterglow from the VLT
  45. GRB100424A: MITSuME optical upper limits
  46. GRB100423A: MITSuME optical upper limits
  47. GRB 100424A : Lulin early z'-band upper limit
  48. GRB 100424A: GROND Upper Limits
  49. GRB 100424A: PAIRITEL NIR Upper Limits
  50. GRB 100425A: Swift detection of a burst
  51. GRB 100424A: NOT optical observations
  52. GRB 100424A: Enhanced Swift-XRT position
  53. GRB 100424A: Swift detection of a burst
  54. GRB 100420A: GRT Optical Observation
  55. Swift Trigger 420256: D50 optical limits
  56. GRB 100423B: Fermi GBM detection
  57. Swift Trigger 420256: IAC80 R-band observations
  58. Swift Trigger 420256: BOOTES-2 observations
  59. Swift Trigger 420256: ROTSE-III Optical Limits
  60. Trigger 420256: Swift detection of a possible GRB
  61. GRB 100423A: GROND discovery of afterglow
  62. GRB 100423A: Swift detection of a burst
  63. GRB100418A: REM possible afterglow detection
  64. GRB 100418A: Continuing Swift/UVOT Observations
  65. GRB100420A: MITSuME optical upper limits
  66. GRB 100414A: CFHT optical observations
  67. GRB 100420A: Swift/UVOT Upper Limits
  68. GRB 100420A: Enhanced Swift-XRT position
  69. GRB 100418A: SARA second epoch
  70. GRB 100420A: SARA Upper Limits
  71. GRB 100418A: RTT150 observations during the optical afterglow maximum
  72. GRB 100418A: optical observations
  73. GRB 100414A: Confirmation of the X-ray afterglow
  74. GRB 100418A: SMA submm detection
  75. GRB 100420A: ROTSE-III Optical Limits
  76. GRB 100420A: Swift detection of a burst
  77. GRB 100418A: Swift/UVOT Observations
  78. GRB 100418A: Gemini-N redshift confirmation
  79. GRB 100413A: GMRT observation of radio afterglow
  80. GRB100418A: VLT/X-shooter redshift and photometry
  81. GRB 100418A: SARA observations
  82. GRB 100418A: GROND observations; missing author list added
  83. GRB 100418A: GROND observations
  84. GRB 100418A: Enhanced Swift-XRT position
  85. GRB 100418A: ROTSE-III Optical Limits
  86. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  87. GRB 100414A: Suzaku WAM observation of the prompt emission
  88. GRB 100414A: Swift/UVOT Observations
  89. GRB 100414A: GROND Detection of the Optical Afterglow
  90. GRB 100414A: Gemini-N candidate and redshift
  91. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  92. GRB 100414A: Palomar Transient Factory Observations
  93. GRB 100413B: Swift Confirmation of Burst
  94. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  95. GRB 100414A: IPN Localization
  96. GRB 100414A: Fermi GBM detection
  97. GRB100414A: Fermi LAT detection
  98. GRB 100413B : Swift detection of a burst
  99. GRB 100413A: GROND Upper limits
  100. GRB 100413A: Swift/UVOT Upper Limits

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