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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"

28248 results found.

  1. GRB 100724B: Fermi GBM detection
  2. GRB 100724A: Swift XRT refined analysis
  3. GRB 100724A: Enhanced Swift-XRT position
  4. GRB 100724A: Swift/UVOT observations
  5. GRB 100724A: Swift-BAT refined analysis
  6. GRB 100724A: Swift detection of a burst
  7. GRB 100614A: 10.4-m GTC deep-optical limit
  8. GRB 100722A: Fermi GBM detection
  9. GRB 100718A: MASTER-Net optical prompt and alert observations
  10. GRB 100719A: Swift-BAT refined analysis
  11. GRB 100713A: optical observation in Maidanak
  12. GRB 100713A: Swift XRT refined analysis
  13. GRB 100713A: GROND upper limits
  14. GRB 100713A: TNG optical observations
  15. GRB100713A: Swift X-ray afterglow detection
  16. GRB 100713A: a long GRB detected by INTEGRAL
  17. GRB 100707A: Suzaku WAM observation of the prompt emission
  18. GRB 100707A: Fermi LAT detection
  19. GRB 100707A: Fermi GBM detection
  20. GRB 100628A: Chandra observations
  21. Tentative redshift of GRB100704A from Swift-XRT data
  22. GRB 100704A: Swift XRT refined analysis
  23. GRB 100704: Swift/UVOT Upper Limits
  24. GRB 100704A: Fermi GBM observation
  25. GRB 100704A: Swift-BAT refined analysis
  26. GRB 100704A: Enhanced Swift-XRT position
  27. GRB 100704A: Swift detection of a burst
  28. GRB 100615A: Additional Gemini/NIRI observations
  29. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  30. GRB 100702A, Swift-BAT refined analysis
  31. GRB 100702A: Swift XRT refined analysis
  32. Swift/UVOT observations of GRB100702A
  33. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  34. GRB 100701B: Fermi GBM detection
  35. GRB 100702A: Magellan near-IR observations
  36. GRB 100702A: VLT optical observations
  37. GRB 100702: ROTSE-III Optical Limits
  38. GRB 100702A: Swift detection of a short burst
  39. GRB 100615A: Chandra X-ray ToO Observation
  40. GRB 100213B: Detection of Fading Optical Afterglow
  41. GRB 100628A: GROND optical/NIR observations of the host candidate
  42. GRB 100628A: Gemini North Observations
  43. GRB100625A: GROND confirmation of constant source
  44. GRB 090709A: Host galaxy detection
  45. GRB 100628A: Swift/UVOT Upper Limits
  46. GRB100628A: RTT150 optical observations
  47. GRB 100628A: Swift-BAT refined analysis
  48. GRB 100628A: Swift detection of a short hard burst
  49. GRB 100614A: CrAO optical limit
  50. GRB 100625A: Swift/UVOT Upper Limits
  51. GRB 100625A: Swift-BAT refined analysis
  52. GRB 100625A: Swift-XRT Team refined analysis
  53. GRB 100625A: Enhanced Swift-XRT position
  54. GRB 100625A: Swift detection of a short hard burst
  55. GRB 100418A: late time optical observations
  56. GRB 100621A: IRSF/SIRIUS NIR Observation
  57. GRB 100621A: Swift/UVOT observations
  58. GRB 100621A: Swift XRT refined analysis
  59. GRB 100621A: Swift-BAT refined analysis
  60. GRB 100621A: GROND observation of bright NIR afterglow
  61. GRB 100621A: Enhanced Swift-XRT position
  62. GRB 100621A: ROTSE-III Optical Limits
  63. GRB 100621A: Swift detection of a burst
  64. GRB 100606A: Optical Limits
  65. GRB 100619A: Fermi GBM detection
  66. GRB 100619A: Swift/UVOT Upper Limits
  67. GRB 100619A: Swift-XRT refind analysis
  68. GRB 100619A: Enhanced Swift-XRT position
  69. GRB 100619A: Swift-BAT refined analysis
  70. GRB 100619A: Swift detection of a burst
  71. GRB 100614A: Gemini/NIRI Observations
  72. GRB 100615A: Gemini/NIRI Observations
  73. GRB 100615A: Swift/UVOT Upper Limits
  74. GRB 100614A: Swift/UVOT Upper Limits
  75. GRB 100614A: NOT optical upper limits
  76. GRB 100614A: Swift-BAT refined analysis
  77. GRB 100615A: Fermi GBM detection
  78. GRB 100615A: Swift-BAT refined analysis
  79. GRB 100614A: Enhanced Swift-XRT position
  80. GRB 100615A: Enhanced Swift-XRT position
  81. GRB 100615A: Swift-XRT refined analysis
  82. GRB 100614A: Swift-XRT refined analysis
  83. GRB 100615A: PAIRITEL NIR Upper Limits
  84. GRB 100615A: NTT/Ultracam imaging
  85. GRB 100615A: Swift detection of a burst
  86. GRB 100614A: Swift detection of a burst
  87. GRB 100606A: Suzaku WAM observation of the prompt emission
  88. GRB 100606A: GROND observations
  89. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  90. Radio detection of GRB100418a with ATCA
  91. GRB 100606A: Swift/UVOT Upper Limits
  92. GRB 100606A Swift-XRT refined analysis
  93. GRB 100606A: Swift-BAT refined analysis
  94. GRB 100606A: Enhanced Swift-XRT position
  95. Swift Trigger 424040 is not a GRB
  96. GRB 100606A: Swift detection of a burst
  97. Swift detection of outburst from the SFXT IGR J18410-0535
  98. GRB 100111A: Maidanak optical observations
  99. GRB 100418A: Maidanak optical observations
  100. GRB 100513A: CrAO optical observations

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