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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"

26540 results found.

  1. GRB 100528A: Faulkes Telescope North Detection
  2. GRB 100528A: GROND detection in all bands
  3. GRB 100528A: NOT optical observation
  4. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  5. GRB100526B: GROND Upper limits
  6. GRB 100528A: Fermi GBM observation
  7. GRB 100528A: SuperAGILE Localization of a Long GRB
  8. GRB 100526B: Swift-XRT confirmation of fading afterglow
  9. GRB 100526B: Swift/UVOT Upper Limits
  10. GRB 100526A: Swift/UVOT Upper Limits
  11. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  12. GRB 100526A: NOT optical upper limit
  13. GRB 100526A: Swift XRT refined analysis
  14. GRB 100526B: Swift XRT/UVOT observations
  15. GRB 100526A: Enhanced Swift-XRT position
  16. GRB 100526A: MASTER-Net optical alert observations
  17. GRB 100526A: Swift detection of a burst
  18. Konus-Wind observation of GRB 100522A
  19. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  20. GRB 100522A: Fermi GBM observation
  21. GRB 100522A: Swift XRT refined analysis
  22. GRB 100522A: Enhanced Swift-XRT position
  23. GRB 100522A: NIR observations from CAHA
  24. GRB 100522A: BOOTES-2 optical limit
  25. GRB 100522A: Swift detection of a burst
  26. GRB 100418A: CrAO optical observations
  27. GRB 100518A: GROND afterglow observation and photo-z
  28. GRB 100518A: Swift-XRT refined analysis
  29. GRB 100518A: optical afterglow decay
  30. GRB 100518A: BOOTES-3 optical observations
  31. Update to the configuration of the Fermi-LAT onboard GRB search
  32. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  33. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  34. GRB 100513A: MITSuME Akeno Optical Observation
  35. Swift Trigger 422437 is probably not a GRB
  36. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  37. GRB 100514A: optical afterglow confirmation
  38. GRB 100514A: Swift/UVOT Observations
  39. GRB 100514A: YNAO-GMG observations
  40. GRB 100514A: Swift XRT refined analysis
  41. GRB 100514A: Enhanced Swift-XRT position
  42. GRB 100514A: Swift-BAT refined analysis
  43. GRB 100514A: Faulkes Telescope South observations
  44. GRB 100514A: Swift detection of a burst
  45. GRB 100513A: Faulkes Telescope South observations
  46. GRB 100513A: Swift/UVOT upper limits
  47. GRB 100513A, RIMOTS optical upper limits
  48. GRB 100513A: Swift XRT refined analysis
  49. GRB 100513A: Enhanced Swift-XRT position
  50. GRB 100513A: Lick observations and R-band dropout
  51. GRB 100513A: SARA-N Upper Limit
  52. GRB 100513A: Swift detection of a burst
  53. GRB 100510A: Fermi GBM detection/observation
  54. GRB 100511A: Fermi GBM detection/observation
  55. GRB 100511A: Super-LOTIS early observations
  56. Swift-BAT trigger 421695 is likely not astrophysical
  57. GRB100504A: Optical upper limits at IAO
  58. GRB 100511A, RIMOTS optical upper limits
  59. Trigger 421695: Swift detection of a possible burst
  60. GRB100503A: Suzaku WAM observation of the prompt emission
  61. GRB 100508A: GROND Detection of the optical afterglow
  62. GRB 100508A: Swift-XRT Refined analysis
  63. GRB 100508A: Swift-BAT refined analysis
  64. GRB 100508A: Enhanced Swift-XRT position
  65. GRB100508A: Swift/UVOT Detection of the Afterglow
  66. GRB 100508A: ROTSE-III Optical Limits
  67. GRB 100508A: Swift detection of a burst
  68. GRB 100418A: Keck imaging
  69. GRB 100418A: RTT150 optical observations
  70. GRB 100504A: Fermi GBM observation
  71. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  72. GRB 100504A: Swift/UVOT Observations
  73. GRB 100504A: Swift-XRT refined analysis
  74. GRB 100504A: Enhanced Swift-XRT position
  75. GRB 100504A: GROND Upper limits
  76. GRB 100504A: SARA-South Upper Limit
  77. GRB 100503A: Fermi GBM detection
  78. GRB 100504A: Swift detection of a burst
  79. INTEGRAL observations of Swift GRB trigger 421072
  80. GRB100423A : Suzaku WAM observation of the prompt emission
  81. Trigger 421072: Possible Swift detection of a GRB or transient
  82. GRB 100420A: Terskol optical upper limit
  83. GRB 100427A: Swift XRT and UVOT Upper Limits
  84. GRB 100427A: Fermi GBM detection
  85. GRB 100414A : EVLA Radio Detection
  86. GRB 100414A : WSRT Radio Detection
  87. Konus-Wind observation of GRB 100423A
  88. GRB 100423A: CrAO optical observations
  89. GRB 100418A: Terskol optical observations
  90. GRB 100424A: CrAO optical observations
  91. GRB 100424A: NIR Afterglow Confirmation
  92. GRB 100425A: Swift XRT refined analysis
  93. GRB 100424A: Gemini/NIRI H-band observations
  94. GRB100425A: Swift/UVOT Upper Limits
  95. GRB 100424A: Swift/UVOT Upper Limits
  96. GRB 100424A: Liverpool Telescope Upper Limits
  97. GRB 100425A: Enhanced Swift-XRT position
  98. GRB 100425A: Swift-BAT refined analysis
  99. GRB 100425A: GROND afterglow observation
  100. GRB 100424A: Gemini/NIRI Candidate Afterglow

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