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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"

36393 results found.

  1. GRB 100702: ROTSE-III Optical Limits
  2. GRB 100702A: Swift detection of a short burst
  3. GRB 100615A: Chandra X-ray ToO Observation
  4. GRB 100213B: Detection of Fading Optical Afterglow
  5. GRB 100625A: Fermi GBM detection
  6. GRB 100628A: Second epoch of Magellan near-IR observations
  7. GRB 100628A: GROND optical/NIR observations of the host candidate
  8. GRB 100628A: Gemini North Observations
  9. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  10. GRB 100628A: Swift XRT refined position
  11. GRB100625A: GROND confirmation of constant source
  12. GRB 100625A Gemini-South 2nd epoch imaging
  13. GRB 090709A: Host galaxy detection
  14. GRB 100628A: Magellan near-IR observations
  15. GRB 100628A: Swift/UVOT Upper Limits
  16. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  17. GRB 100628A: INTEGRAL SPI-ACS light curve
  18. GRB 100625A: Magellan near-IR Observations
  19. GRB 100628A: Swift-BAT refined analysis
  20. GRB 100628A: Swift detection of a short hard burst
  21. GRB 100614A: CrAO optical limit
  22. GRB 100625A: Swift/UVOT Upper Limits
  23. GRB 100625A: Swift-BAT refined analysis
  24. Konus-Wind observation of GRB 100625A
  25. GRB 100625A : IRSF/SIRIUS NIR upper limit
  26. GRB 100625A: Swift-XRT Team refined analysis
  27. GRB 100625A: Gemini candidate afterglow
  28. GRB 100625A: Enhanced Swift-XRT position
  29. GRB100625A : MOA optical upper limit
  30. GRB 100625A: Swift detection of a short hard burst
  31. GRB 100418A: late time optical observations
  32. Konus-Wind observation of GRB 100621A
  33. GRB 100621A: IRSF/SIRIUS NIR Observation
  34. GRB 100621A MOA-II optical limit
  35. GRB 100619A: Correction to the Fermi GBM trigger time
  36. GRB 100621A: Swift/UVOT observations
  37. GRB 100621A: Swift XRT refined analysis
  38. GRB 100621A: VLT/X-shooter redshift
  39. GRB 100621A: Swift-BAT refined analysis
  40. GRB 100621A: GROND observation of bright NIR afterglow
  41. GRB 100621A: Enhanced Swift-XRT position
  42. GRB 100621A: Prompt enhanced Swift-XRT position
  43. GRB 100621A: ROTSE-III Optical Limits
  44. GRB 100621A: Swift detection of a burst
  45. GRB 100606A: Optical Limits
  46. GRB 100619A: Fermi GBM detection
  47. GRB 100619A: Swift/UVOT Upper Limits
  48. GRB 100619A: Swift-XRT refind analysis
  49. GRB 100619A: Enhanced Swift-XRT position
  50. GRB 100619A: Swift-BAT refined analysis
  51. GRB 100619A: Swift detection of a burst
  52. GRB 100614A: Gemini/NIRI Observations
  53. GRB 100615A: Gemini/NIRI Observations
  54. Fermi GBM trigger 100612038 is not a GRB
  55. GRB 100615A: Swift/UVOT Upper Limits
  56. GRB 100614A: Swift/UVOT Upper Limits
  57. GRB 100614A: NOT optical upper limits
  58. GRB 100614A: MASTER-Net optical alert observations
  59. GRB 100614A: Swift-BAT refined analysis
  60. GRB 100615A: Fermi GBM detection
  61. GRB 100615A: Swift-BAT refined analysis
  62. GRB 100614A: Enhanced Swift-XRT position
  63. GRB 100615A: Enhanced Swift-XRT position
  64. GRB 100615A: Swift-XRT refined analysis
  65. GRB 100614A: Swift-XRT refined analysis
  66. GRB 100614 : XMM-Newton observation
  67. GRB 100615A: GROND observations, upper limits
  68. GRB 100615A: PAIRITEL NIR Upper Limits
  69. GRB 100615A: NTT/Ultracam imaging
  70. GRB 100615A: Swift detection of a burst
  71. GRB 100614A: WHT I-band observations
  72. GRB 100614A: BOOTES-2/TELMA optical observations
  73. GRB 100614A: Liverpool Telescope Observations
  74. GRB 100614A: Swift detection of a burst
  75. GRB 100606A: Suzaku WAM observation of the prompt emission
  76. GRB 100606A: GROND observations
  77. Konus-Wind observation of GRB 100606A
  78. Radio detection of GRB100418a with ATCA
  79. GRB 100606A: Gemini-South imaging
  80. GRB 100606A: Swift/UVOT Upper Limits
  81. GRB 100606A Swift-XRT refined analysis
  82. GRB 100606A: Swift-BAT refined analysis
  83. GRB 100606A: Enhanced Swift-XRT position
  84. Swift Trigger 424040 is not a GRB
  85. GRB 100606A: Prompt enhanced Swift-XRT position
  86. GRB 100606A: Swift detection of a burst
  87. GRB 100111A: Maidanak optical observations
  88. GRB 100418A: Maidanak optical observations
  89. GRB 100513A: CrAO optical observations
  90. GRB 100514A: CrAO optical observations
  91. GRB 100526A: optical upper limit
  92. Konus-Wind observation of GRB 100528A
  93. GRB 100528A: Faulkes Telescope North Detection
  94. GRB 100528A: GROND detection in all bands
  95. GRB 100528A: NOT optical observation
  96. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  97. GRB100526B: GROND Upper limits
  98. GRB 100528A: Fermi GBM observation
  99. GRB 100528A: SuperAGILE Localization of a Long GRB
  100. GRB 100526B: Swift-XRT confirmation of fading afterglow

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