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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"

27581 results found.

  1. Konus-Wind observation of GRB 100522A
  2. GRB100522A: Suzaku WAM observation of the prompt emission
  3. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  4. Swift/UVOT observations of GRB100522A.
  5. GRB 100522A: Fermi GBM observation
  6. GRB 100522A: Swift XRT refined analysis
  7. GRB 100522A, Swift-BAT refined analysis
  8. GRB 100522A: BOOTES-2 optical limit
  9. GRB 100522A: Swift detection of a burst
  10. GRB 100518A: GROND afterglow observation and photo-z
  11. GRB 100518A: Swift/UVOT Upper Limits
  12. GRB 100518A: Swift-XRT refined analysis
  13. GRB 100518A: optical afterglow decay
  14. Update to the configuration of the Fermi-LAT onboard GRB search
  15. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  16. Swift-BAT trigger 422437 is not anything astrophysical
  17. Swift Trigger 422437 is probably not a GRB
  18. Fermi/GBM trigger 295791986 - unreliable location
  19. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  20. GRB 100514A: Swift/UVOT Observations
  21. GRB 100514A: YNAO-GMG observations
  22. GRB 100514A: Swift XRT refined analysis
  23. GRB 100514A: MASTER-Net optical observations
  24. GRB 100514A: Swift-BAT refined analysis
  25. GRB 100514A: Faulkes Telescope South observations
  26. GRB 100514A: Swift detection of a burst
  27. GRB 100513A: Faulkes Telescope South observations
  28. GRB 100513A: Swift/UVOT upper limits
  29. GRB 100513A, RIMOTS optical upper limits
  30. GRB 100513A: Swift-BAT refined analysis
  31. GRB 100513A: PAIRITEL NIR afterglow candidate
  32. GRB 100513A: Swift detection of a burst
  33. GRB 100510A: Fermi GBM detection/observation
  34. GRB 100511A: Fermi GBM detection/observation
  35. GRB 100511A: Super-LOTIS early observations
  36. Swift-BAT trigger 421695 is likely not astrophysical
  37. GRB 100510A: MAXI/GSC detection
  38. GRB 100511A, RIMOTS optical upper limits
  39. Trigger 421695: Swift detection of a possible burst
  40. GRB100508A: Further Swift/UVOT Observations
  41. GRB100503A: Suzaku WAM observation of the prompt emission
  42. GRB 100508A: GROND Detection of the optical afterglow
  43. GRB 100508A: Swift-XRT Refined analysis
  44. GRB 100508A: Swift-BAT refined analysis
  45. GRB100508A: Swift/UVOT Detection of the Afterglow
  46. GRB 100508A: ROTSE-III Optical Limits
  47. GRB 100508A: Swift detection of a burst
  48. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  49. Swift-BAT refined analysis of trigger 421262
  50. GRB 100504A: Fermi GBM observation
  51. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  52. GRB 100504A: Swift/UVOT Observations
  53. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  54. GRB 100504A: GROND Upper limits
  55. GRB 100504A: Swift-BAT refined analysis
  56. GRB 100504A: SARA-South Upper Limit
  57. GRB 100503A: Fermi GBM detection
  58. GRB 100504A: UVOT-enhanced XRT position
  59. GRB 100504A: Swift detection of a burst
  60. Swift-BAT trigger 421072 is not astrophyical
  61. INTEGRAL observations of Swift GRB trigger 421072
  62. Trigger 421072: Possible Swift detection of a GRB or transient
  63. GRB 100427A: Swift XRT and UVOT Upper Limits
  64. GRB 100427A: Fermi GBM detection
  65. GRB 100427A detected in ground analysis of Swift BAT data
  66. Konus-Wind observation of GRB 100423A
  67. GRB 100425A: Swift XRT refined analysis
  68. GRB100425A: Swift/UVOT Upper Limits
  69. GRB 100424A: Swift/UVOT Upper Limits
  70. GRB 100425A: Swift-BAT refined analysis
  71. GRB 100425A: GROND afterglow observation
  72. GRB 100424A: D50 optical limits
  73. GRB 100424A : Lulin early z'-band upper limit
  74. GRB 100424A: GROND Upper Limits
  75. GRB 100424A: PAIRITEL NIR Upper Limits
  76. GRB 100424A: Swift-XRT refined analysis
  77. GRB 100425A: Swift detection of a burst
  78. GRB 100424A, Swift-BAT refined analysis
  79. GRB 100424A: Swift detection of a burst
  80. GRB 100420A: GRT Optical Observation
  81. Swift-BAT refined analysis of trigger 420256
  82. Swift Trigger 420256: D50 optical limits
  83. GRB 100420A: Swift-BAT refined analysis
  84. GRB 100423B: Fermi GBM detection
  85. GRB 100423A: Swift-BAT refined analysis
  86. Swift Trigger 420256: IAC80 R-band observations
  87. Swift Trigger 420256: BOOTES-2 observations
  88. Swift Trigger 420256: ROTSE-III Optical Limits
  89. Trigger 420256: Swift detection of a possible GRB
  90. GRB 100423A: Skynet/PROMPT Detections
  91. GRB 100423A: GROND discovery of afterglow
  92. GRB 100423A: Swift detection of a burst
  93. GRB 100418A: Continued PAIRITEL NIR Observations
  94. GRB 100414A: CFHT optical observations
  95. GRB 100420A: Swift/UVOT Upper Limits
  96. GRB 100420A: XRT refined analysis
  97. GRB 100418A: SARA second epoch
  98. GRB 100420A: SARA Upper Limits
  99. GRB 100418A: MASTER-Net optical observations
  100. GRB 100414A: Confirmation of the X-ray afterglow

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