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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"

28119 results found.

  1. GRB 100625A: Magellan near-IR Observations
  2. GRB 100628A: Swift detection of a short hard burst
  3. Swift-BAT trigger 426048 is not a burst
  4. GRB 100614A: CrAO optical limit
  5. GRB 100625A: Swift/UVOT Upper Limits
  6. GRB 100625A : IRSF/SIRIUS NIR upper limit
  7. GRB 100625A: Swift-XRT Team refined analysis
  8. GRB 100625A: Gemini candidate afterglow
  9. GRB 100625A: Enhanced Swift-XRT position
  10. GRB100625A : MOA optical upper limit
  11. GRB 100625A: Swift detection of a short hard burst
  12. GRB 100418A: late time optical observations
  13. GRB 100621A: IRSF/SIRIUS NIR Observation
  14. GRB 100621A MOA-II optical limit
  15. GRB 100621A: Swift/UVOT observations
  16. GRB 100621A: Swift XRT refined analysis
  17. GRB 100621A: VLT/X-shooter redshift
  18. GRB 100621A: GROND observation of bright NIR afterglow
  19. GRB 100621A: Enhanced Swift-XRT position
  20. GRB 100621A: Prompt enhanced Swift-XRT position
  21. GRB 100621A: ROTSE-III Optical Limits
  22. GRB 100621A: Swift detection of a burst
  23. GRB 100606A: Optical Limits
  24. GRB 100619A: Fermi GBM detection
  25. GRB 100619A: Swift/UVOT Upper Limits
  26. GRB 100619A: Swift-XRT refind analysis
  27. GRB 100619A: Enhanced Swift-XRT position
  28. GRB 100619A: Swift detection of a burst
  29. GRB 100614A: Gemini/NIRI Observations
  30. GRB 100615A: Gemini/NIRI Observations
  31. XRF 100616a : MAXI/GSC detection of a probable XRF
  32. GRB 100615A: Swift/UVOT Upper Limits
  33. GRB 100614A: Swift/UVOT Upper Limits
  34. GRB 100614A: NOT optical upper limits
  35. GRB 100614A: MASTER-Net optical alert observations
  36. GRB 100615A: Fermi GBM detection
  37. GRB 100614A: Enhanced Swift-XRT position
  38. GRB 100615A: Enhanced Swift-XRT position
  39. GRB 100615A: Swift-XRT refined analysis
  40. GRB 100614A: Swift-XRT refined analysis
  41. GRB 100615A: GROND observations, upper limits
  42. GRB 100615A: PAIRITEL NIR Upper Limits
  43. GRB 100615A: NTT/Ultracam imaging
  44. GRB 100615A: Swift detection of a burst
  45. GRB 100614A: WHT I-band observations
  46. GRB 100614A: Liverpool Telescope Observations
  47. GRB 100614A: Swift detection of a burst
  48. GRB 100606A: GROND observations
  49. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  50. Radio detection of GRB100418a with ATCA
  51. GRB 100606A: Gemini-South imaging
  52. GRB 100606A: Swift/UVOT Upper Limits
  53. GRB 100606A Swift-XRT refined analysis
  54. GRB 100606A: Enhanced Swift-XRT position
  55. Swift Trigger 424040 is not a GRB
  56. GRB 100606A: Prompt enhanced Swift-XRT position
  57. GRB 100606A: Swift detection of a burst
  58. Swift detection of outburst from the SFXT IGR J18410-0535
  59. GRB 100111A: Maidanak optical observations
  60. GRB 100418A: Maidanak optical observations
  61. GRB 100513A: CrAO optical observations
  62. GRB 100514A: CrAO optical observations
  63. GRB 100526A: optical upper limit
  64. GRB 100528A: Faulkes Telescope North Detection
  65. GRB 100528A: GROND detection in all bands
  66. GRB 100528A: NOT optical observation
  67. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  68. GRB100526B: GROND Upper limits
  69. GRB 100528A: SuperAGILE Localization of a Long GRB
  70. GRB 100526B: Swift-XRT confirmation of fading afterglow
  71. GRB 100526B: Swift/UVOT Upper Limits
  72. GRB 100526A: Swift/UVOT Upper Limits
  73. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  74. GRB 100526A: NOT optical upper limit
  75. GRB 100526A: Swift XRT refined analysis
  76. GRB 100526B: Swift XRT/UVOT observations
  77. GRB 100526A: Enhanced Swift-XRT position
  78. GRB 100526B: Swift detection of a probable GRB
  79. GRB 100526A: MASTER-Net optical alert observations
  80. GRB 100526A: Swift detection of a burst
  81. GRB 100522A: GROND observations, upper limits
  82. Swift/UVOT observations of GRB100522A.
  83. GRB 100522A: Swift XRT refined analysis
  84. GRB 100522A: Enhanced Swift-XRT position
  85. GRB 100522A: NIR observations from CAHA
  86. GRB 100522A: BOOTES-2 optical limit
  87. GRB 100522A: Swift detection of a burst
  88. GRB 100418A: CrAO optical observations
  89. GRB 100518A: GROND afterglow observation and photo-z
  90. GRB 100518A: Swift/UVOT Upper Limits
  91. GRB 100518A: Swift-XRT refined analysis
  92. GRB 100518A: optical afterglow decay
  93. GRB 100518A: BOOTES-3 optical observations
  94. Update to the configuration of the Fermi-LAT onboard GRB search
  95. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  96. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  97. GRB 100513A: MITSuME Akeno Optical Observation
  98. Swift Trigger 422437 is probably not a GRB
  99. GRB 100513A: EVLA radio observation
  100. GRB 100514A: optical afterglow confirmation

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