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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"

28276 results found.

  1. GRB 100615A: Swift/UVOT Upper Limits
  2. GRB 100614A: Swift/UVOT Upper Limits
  3. GRB 100614A: NOT optical upper limits
  4. GRB 100614A: Swift-BAT refined analysis
  5. GRB 100615A: Fermi GBM detection
  6. GRB 100615A: Swift-BAT refined analysis
  7. GRB 100614A: Enhanced Swift-XRT position
  8. GRB 100615A: Enhanced Swift-XRT position
  9. GRB 100615A: Swift-XRT refined analysis
  10. GRB 100614A: Swift-XRT refined analysis
  11. GRB 100615A: PAIRITEL NIR Upper Limits
  12. GRB 100615A: NTT/Ultracam imaging
  13. GRB 100615A: Swift detection of a burst
  14. GRB 100614A: Swift detection of a burst
  15. GRB 100606A: Suzaku WAM observation of the prompt emission
  16. GRB 100606A: GROND observations
  17. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  18. Radio detection of GRB100418a with ATCA
  19. GRB 100606A: Swift/UVOT Upper Limits
  20. GRB 100606A Swift-XRT refined analysis
  21. GRB 100606A: Swift-BAT refined analysis
  22. GRB 100606A: Enhanced Swift-XRT position
  23. Swift Trigger 424040 is not a GRB
  24. GRB 100606A: Swift detection of a burst
  25. Swift detection of outburst from the SFXT IGR J18410-0535
  26. GRB 100111A: Maidanak optical observations
  27. GRB 100418A: Maidanak optical observations
  28. GRB 100513A: CrAO optical observations
  29. GRB 100514A: CrAO optical observations
  30. GRB 100526A: optical upper limit
  31. GRB 100528A: Faulkes Telescope North Detection
  32. GRB 100528A: GROND detection in all bands
  33. GRB 100528A: NOT optical observation
  34. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  35. GRB100526B: GROND Upper limits
  36. GRB 100528A: SuperAGILE Localization of a Long GRB
  37. GRB 100526B: Swift-XRT confirmation of fading afterglow
  38. GRB 100526B: Swift/UVOT Upper Limits
  39. GRB 100526A: Swift/UVOT Upper Limits
  40. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  41. GRB 100526A: NOT optical upper limit
  42. GRB 100526A: Swift XRT refined analysis
  43. GRB 100526B: Swift-BAT refined analysis
  44. GRB 100526B: Swift XRT/UVOT observations
  45. GRB 100526A: Swift-BAT refined analysis
  46. GRB 100526A: Enhanced Swift-XRT position
  47. GRB 100526A: MASTER-Net optical alert observations
  48. GRB 100526A: Swift detection of a burst
  49. GRB100522A: Suzaku WAM observation of the prompt emission
  50. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  51. GRB 100522A: GROND observations, upper limits
  52. GRB 100522A: Fermi GBM observation
  53. GRB 100522A: Swift XRT refined analysis
  54. GRB 100522A, Swift-BAT refined analysis
  55. GRB 100522A: Enhanced Swift-XRT position
  56. GRB 100522A: NIR observations from CAHA
  57. GRB 100522A: Swift detection of a burst
  58. GRB 100418A: CrAO optical observations
  59. GRB 100518A: GROND afterglow observation and photo-z
  60. GRB 100518A: Swift-XRT refined analysis
  61. GRB 100518A: optical afterglow decay
  62. GRB 100518A: BOOTES-3 optical observations
  63. Update to the configuration of the Fermi-LAT onboard GRB search
  64. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  65. GRB 100513A: MITSuME Akeno Optical Observation
  66. GRB 100518A: a long GRB detected with INTEGRAL
  67. Swift Trigger 422437 is probably not a GRB
  68. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  69. GRB 100514A: optical afterglow confirmation
  70. GRB 100514A: Swift/UVOT Observations
  71. GRB 100514A: YNAO-GMG observations
  72. GRB 100514A: Swift XRT refined analysis
  73. GRB 100514A: Enhanced Swift-XRT position
  74. GRB 100514A: Swift-BAT refined analysis
  75. GRB 100514A: Swift detection of a burst
  76. GRB 100513A: Swift/UVOT upper limits
  77. GRB 100513A, RIMOTS optical upper limits
  78. GRB 100513A: Swift XRT refined analysis
  79. GRB 100513A: Swift-BAT refined analysis
  80. GRB 100513A: Enhanced Swift-XRT position
  81. GRB 100513A: SARA-N Upper Limit
  82. GRB 100513A: Swift detection of a burst
  83. GRB 100510A: Fermi GBM detection/observation
  84. GRB 100511A: Fermi GBM detection/observation
  85. GRB 100511A: Super-LOTIS early observations
  86. Swift-BAT trigger 421695 is likely not astrophysical
  87. GRB100504A: Optical upper limits at IAO
  88. GRB 100510A: MAXI/GSC detection
  89. GRB 100511A, RIMOTS optical upper limits
  90. Trigger 421695: Swift detection of a possible burst
  91. GRB100503A: Suzaku WAM observation of the prompt emission
  92. GRB 100508A: GROND Detection of the optical afterglow
  93. GRB 100508A: Swift-XRT Refined analysis
  94. GRB 100508A: Swift-BAT refined analysis
  95. GRB 100508A: Enhanced Swift-XRT position
  96. GRB100508A: Swift/UVOT Detection of the Afterglow
  97. GRB 100508A: ROTSE-III Optical Limits
  98. GRB 100508A: Swift detection of a burst
  99. GRB 100418A: Keck imaging
  100. GRB 100418A: RTT150 optical observations

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