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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"

19664 results found.

  1. GRB 090309, Swift-BAT lag analysis
  2. GRB 090313: Swift detection of a burst
  3. GRB 090313: Swift detection of a burst
  4. Swift trigger 346250 is probably not a burst
  5. GRB 090309A: GROND upper limits
  6. GRB 090307A: TAROT Calern observatory optical observations
  7. GRB 090309: Swift/UVOT Upper Limits
  8. GRB 090309: Swift-XRT refined analysis
  9. GRB 090309: Enhanced Swift-XRT position
  10. GRB 090306B: INTEGRAL SPI-ACS light curve
  11. GRB 090309, Swift-BAT refined analysis
  12. GRB 090308: GROND observations
  13. GRB 090308: Gemini GMOS Observations
  14. GRB 090309: Swift detection of a burst
  15. GRB 090308: Swift/UVOT Upper Limits
  16. GRB 090307: GROND Upper Limits
  17. GRB 090306B: GROND Upper Limits
  18. GRB 090305C: Suzaku WAM observation of the prompt emission
  19. GRB 090308: Swift-XRT refined analysis
  20. Radio observation of GRB 081007 with ATCA
  21. ATCA observation of SGR J1550-5418
  22. GRB 090308: Swift-BAT refined analysis
  23. GRB 090308: Swift detection of a burst
  24. GRB 090306B: Possible XRT afterglow
  25. GRB 090307: Swift-XRT afterglow confirmation and analysis
  26. GRB 090307: Swift-BAT refined analysis of trigger 345551
  27. GRB 090306B: Burst detection from Swift-BAT slew data
  28. Swift Trigger 345551 is probably not a GRB
  29. Swift-BAT trigger 345396 is not a GRB
  30. IPN localization of short GRB 090305C
  31. GRB 090306: Swift detection of a possible burst
  32. GRB 090305: Swift/UVOT Upper Limits
  33. GRB 090305: Swift-XRT refined analysis
  34. GRB 090305, Swift-BAT refined analysis
  35. GRB 090305: Swift detection of a short burst
  36. GRB 090301A: Suzaku WAM observation of the prompt emission
  37. Konus-Wind observation of GRB 090301A
  38. GRB 090301A: Swift-BAT refined analysis
  39. GRB 090301: Swift detection of a burst
  40. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  41. SGR J1550-5418
  42. GRB 081211B: Nearby cluster
  43. Swift Restored
  44. Swift Trigger 343319 is not a GRB
  45. GRB090217: XRT analysis
  46. SGR activity seen by BAT during ICSP Ionospheric Events
  47. GRB 090129: Fermi GBM detection
  48. GRB 090205: Swift/UVOT Upper Limits
  49. GRB 090205: Swift-XRT refined analysis
  50. GRB 090205: Swift burst of interest
  51. GRB 090205: GROND observations and photometric redshift estimate
  52. GRB 090205: Swift-BAT refined analysis
  53. GRB 090205: Enhanced Swift-XRT position
  54. GRB 090205: Swift detection of a burst
  55. GRB 090126A: Swift-XRT afterglow confirmation
  56. Konus-Wind observation of GRB 090201
  57. GRB 090201: Swift-XRT refined analysis
  58. GRB090201: Swift UVOT upper limits
  59. GRB 090201: Enhanced Swift-XRT position
  60. GRB 090201: Swift-BAT refined analysis
  61. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  62. GRB 090201: ROTSE-III Optical Limits
  63. GRB 090201: Swift detection of a burst
  64. GRB 090126A: Swift/UVOT Upper Limits
  65. GRB 090129: Swift-BAT refined analysis
  66. GRB 090129: Swift detection of a burst
  67. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  68. GRB 090126A: Swift-XRT Refined Analysis
  69. GRB 090123: GROND detection
  70. 1E1547.0-5408: Swift detection of dust halo
  71. GRB 090123: Swift XRT refined analysis
  72. GRB 090123: Swift/UVOT Observations
  73. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  74. GRB 090123: Swift-BAT refined analysis
  75. GRB090123: Enhanced Swift-XRT position
  76. GRB 090123: Swift detection of a burst
  77. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  78. Swift-BAT trigger 340734 is not a GRB
  79. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  80. AXP 1E1547.0-5408: Fermi GBM observations
  81. Trigger 340734: Swift detection of a possible short burst
  82. AXP 1E1547.0-5408 activity with SGR bursts
  83. GRB 090118 (BATSS): GRT Optical Observation
  84. GRB 090118: Swift-XRT observations
  85. GRB090118 Swift/UVOT upper limits
  86. GRB 090118: GROND Upper Limits
  87. GRB 090118: Possible burst detection from Swift-BAT slew data
  88. GRB 090117: confirmation of the X-ray afterglow
  89. GRB 090117: GROND Upper Limits
  90. GRB090117 Swift/UVOT upper limits
  91. GRB090117: Swift-XRT detection of a possible candidate afterglow
  92. GRB 090113: Swift UVOT upper limits
  93. GRB 090113: GROND Upper Limits
  94. GRB 090113: Swift-XRT refined analysis
  95. GRB 090113: Enhanced Swift-XRT position
  96. GRB 090113: Swift-BAT refined analysis
  97. GRB 090113: ROTSE-III Optical Limits
  98. GRB090113: XRT position
  99. GRB 090113: Swift detection of a burst
  100. GRB 090111, Swift-BAT refined analysis

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