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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"

36405 results found.

  1. GRB 100513A: CrAO optical observations
  2. GRB 100514A: CrAO optical observations
  3. GRB 100526A: optical upper limit
  4. Konus-Wind observation of GRB 100528A
  5. GRB 100528A: Faulkes Telescope North Detection
  6. GRB 100528A: GROND detection in all bands
  7. GRB 100528A: NOT optical observation
  8. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  9. GRB100526B: GROND Upper limits
  10. GRB 100528A: Fermi GBM observation
  11. GRB 100528A: SuperAGILE Localization of a Long GRB
  12. GRB 100526B: Swift-XRT confirmation of fading afterglow
  13. GRB 100526B: Swift/UVOT Upper Limits
  14. GRB 100526A: Swift/UVOT Upper Limits
  15. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  16. GRB 100526A: NOT optical upper limit
  17. GRB 100526A: Swift XRT refined analysis
  18. GRB 100526B: Swift-BAT refined analysis
  19. GRB 100526B: Swift XRT/UVOT observations
  20. GRB 100526A: Swift-BAT refined analysis
  21. GRB 100526A: Enhanced Swift-XRT position
  22. GRB 100526B: Swift detection of a probable GRB
  23. GRB 100526A: MASTER-Net optical alert observations
  24. GRB 100526A: Swift detection of a burst
  25. Konus-Wind observation of GRB 100522A
  26. GRB100522A: Suzaku WAM observation of the prompt emission
  27. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  28. GRB 100522A: GROND observations, upper limits
  29. GRB 100522A: Fermi GBM observation
  30. GRB 100522A: Swift XRT refined analysis
  31. GRB 100522A, Swift-BAT refined analysis
  32. GRB 100522A: Enhanced Swift-XRT position
  33. GRB 100522A: NIR observations from CAHA
  34. GRB 100522A: BOOTES-2 optical limit
  35. GRB 100522A: Swift detection of a burst
  36. GRB 100418A: CrAO optical observations
  37. GRB 100518A: GROND afterglow observation and photo-z
  38. GRB 100518A: Swift/UVOT Upper Limits
  39. GRB 100518A: Swift-XRT refined analysis
  40. GRB 100518A: optical afterglow decay
  41. GRB 100518A: BOOTES-3 optical observations
  42. Update to the configuration of the Fermi-LAT onboard GRB search
  43. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  44. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  45. GRB 100513A: MITSuME Akeno Optical Observation
  46. Swift-BAT trigger 422437 is not anything astrophysical
  47. GRB 100518A: a long GRB detected with INTEGRAL
  48. Swift Trigger 422437 is probably not a GRB
  49. Fermi/GBM trigger 295791986 - unreliable location
  50. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  51. GRB 100513A: EVLA radio observation
  52. GRB 100514A: optical afterglow confirmation
  53. GRB 100514A: Swift/UVOT Observations
  54. GRB 100514A: YNAO-GMG observations
  55. GRB 100514A: Swift XRT refined analysis
  56. GRB 100514A: MASTER-Net optical observations
  57. GRB 100514A: Enhanced Swift-XRT position
  58. GRB 100514A: Swift-BAT refined analysis
  59. GRB 100514A: Faulkes Telescope South observations
  60. GRB 100514A: Swift detection of a burst
  61. GRB 100513A: Faulkes Telescope South observations
  62. GRB 100513A: Swift/UVOT upper limits
  63. GRB 100513A, RIMOTS optical upper limits
  64. GRB 100513A: Swift XRT refined analysis
  65. GRB 100513A: Swift-BAT refined analysis
  66. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  67. GRB 100513A: Enhanced Swift-XRT position
  68. GRB 100513A: Lick observations and R-band dropout
  69. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  70. GRB 100513A: SARA-N Upper Limit
  71. GRB 100513A: PAIRITEL NIR afterglow candidate
  72. GRB 100513A: Swift detection of a burst
  73. GRB 100510A: Fermi GBM detection/observation
  74. GRB 100511A: Fermi GBM detection/observation
  75. GRB 100511A: Super-LOTIS early observations
  76. Swift-BAT trigger 421695 is likely not astrophysical
  77. GRB100504A: Optical upper limits at IAO
  78. GRB 100510A: MAXI/GSC detection
  79. GRB 100511A, RIMOTS optical upper limits
  80. GRB100508A: Further Swift/UVOT Observations
  81. GRB100503A: Suzaku WAM observation of the prompt emission
  82. GRB 100508A: GROND Detection of the optical afterglow
  83. GRB 100508A: Swift-XRT Refined analysis
  84. GRB 100508A: Swift-BAT refined analysis
  85. GRB 100508A: Enhanced Swift-XRT position
  86. GRB100508A: Swift/UVOT Detection of the Afterglow
  87. GRB 100508A: ROTSE-III Optical Limits
  88. GRB 100508A: Swift detection of a burst
  89. GRB 100418A: Keck imaging
  90. GRB 100418A: RTT150 optical observations
  91. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  92. GRB 100504A: Fermi GBM observation
  93. GRB 100504A: Swift/UVOT Observations
  94. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  95. GRB 100504A: Swift-XRT refined analysis
  96. GRB 100504A: Enhanced Swift-XRT position
  97. GRB 100504A: GROND Upper limits
  98. GRB 100504A: Swift-BAT refined analysis
  99. GRB 100504A: SARA-South Upper Limit
  100. GRB 100503A: Fermi GBM detection

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