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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"

28109 results found.

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

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