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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"

27919 results found.

  1. 1E1547.0-5408: Swift detection of dust halo
  2. GRB 090123: Swift XRT refined analysis
  3. GRB 090123: Swift/UVOT Observations
  4. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  5. GRB 090123: Swift-BAT refined analysis
  6. GRB090123: Enhanced Swift-XRT position
  7. GRB 090123: Swift detection of a burst
  8. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  9. Swift-BAT trigger 340734 is not a GRB
  10. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  11. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  12. AXP 1E1547.0-5408: Fermi GBM observations
  13. Trigger 340734: Swift detection of a possible short burst
  14. AXP 1E1547.0-5408 activity with SGR bursts
  15. GRB 090118 (BATSS): GRT Optical Observation
  16. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  17. GRB 090118: Swift-XRT observations
  18. GRB090118 Swift/UVOT upper limits
  19. GRB 090118: GROND Upper Limits
  20. GRB 090118: Possible burst detection from Swift-BAT slew data
  21. GRB 090117B : Fermi GBM detection
  22. GRB 090117: confirmation of the X-ray afterglow
  23. GRB 090117C - Fermi GRB Detection
  24. GRB 090117: GROND Upper Limits
  25. GRB090117 Swift/UVOT upper limits
  26. GRB090117: Swift-XRT detection of a possible candidate afterglow
  27. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  28. GRB 090113: Swift UVOT upper limits
  29. GRB 090113: GROND Upper Limits
  30. GRB 090113: Swift-XRT refined analysis
  31. GRB 090113: Enhanced Swift-XRT position
  32. GRB 090113: Swift-BAT refined analysis
  33. GRB 090113: ROTSE-III Optical Limits
  34. GRB090113: XRT position
  35. GRB 090112B: Fermi GBM Detection
  36. GRB 090113: Swift detection of a burst
  37. GRB 090112: Fermi GBM detection
  38. GRB 090109: Fermi GBM detection
  39. GRB 090108B: Fermi GBM detection
  40. GRB 090111, Swift-BAT refined analysis
  41. GRB 090111: Swift UVOT Upper Limits
  42. GRB 090108: Fermi GBM Detection
  43. GRB 090111: Swift-XRT refined analysis
  44. GRB 090111: Enhanced Swift-XRT position
  45. GRB 090111: Swift detection of a burst
  46. GRB090107B: Fermi GBM Detection
  47. GRB 090107B: Swift XRT afterglow confirmation
  48. GRB 090107B: Swift/UVOT Observations
  49. GRB 090107B: Swift-XRT detection of possible afterglow
  50. Fermi/GBM detection of GRB 081226A
  51. Fermi/GBM detection of GRB 081225
  52. GRB 090107: Swift-BAT refined analysis
  53. GRB 090107: Swift detection of a burst
  54. GRB 081231: Fermi GBM Detection
  55. VLA radio upper limit on GRB 090102
  56. GRB 090102: GRT Optical Observation
  57. Swift triggered on the HMXB 1A 1118-61
  58. Konus-Wind observation of GRB 090102
  59. GRB 081229: Fermi GBM detection
  60. Swift UVOT observations of GRB 090102
  61. GRB 090102: Swift-BAT refined analysis
  62. GRB 090102: Swift burst of interest
  63. GRB 090102: Swift XRT refined analysis
  64. GRB 090102: Enhanced Swift-XRT position
  65. GRB 090102: TAROT Calern observatory optical light curve
  66. GRB 090102: Swift detection of a burst with an optical counterpart
  67. GRB 090102: TAROT Calern observatory optical observations
  68. GRB 081230: GROND confirmation of the afterglow
  69. GRB 081230, Swift-BAT refined analysis
  70. GRB081230: Swift-XRT refined analysis
  71. GRB 081230 Swift/UVOT Observations
  72. GRB 081230: Enhanced Swift-XRT position
  73. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  74. GRB 081230: ROTSE-III Detection of Optical Counterpart
  75. GRB 081230: Swift detection of a burst
  76. GRB 081228: GROND confirmation of the optical/NIR afterglow
  77. GRB 081226C: Fermi GBM detection
  78. GRB 081228, Swift-BAT refined analysis
  79. VLA radio detection of GRB 081221
  80. GRB 081228: Swift/UVOT Upper Limits
  81. GRB 081228: Swift-XRT Team refined analysis
  82. GRB 081228: detection by GROND
  83. GRB 081228: Enhanced Swift-XRT position
  84. GRB 081228: TAROT Calern observatory optical observations
  85. GRB 081228: Swift detection of a burst
  86. GRB 081226B: Swift XRT and UVOT upper limits
  87. GRB 081226: Swift-XRT refined analysis
  88. GRB 081226A: Swift UVOT Upper Limits
  89. GRB 081226A: Swift-BAT refined analysis
  90. GRB 081226: ROTSE-III Optical Limits
  91. GRB 081226: Swift detection of a possible short-hard burst
  92. GRB081224: LAT retraction
  93. GRB 081224: Swift-XRT observation
  94. GRB 081224: Fermi GBM Detection & LAT Localization
  95. Konus-Wind observation of GRB 081222
  96. GRB 081223: Fermi GBM detection
  97. GRB 081221: GROND observations
  98. GRB 081222:Optical afterglow observation
  99. GRB 081222: Fermi GBM observation
  100. GRB 081222: Gemini-South absorption redshift

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