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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"

21526 results found.

  1. Swift-BAT trigger 345396 is not a GRB
  2. IPN localization of short GRB 090305C
  3. GRB 090306: Swift detection of a possible burst
  4. GRB 090305: Swift/UVOT Upper Limits
  5. GRB 090305: Swift-XRT refined analysis
  6. GRB 090305, Swift-BAT refined analysis
  7. GRB090305: GMOS-S Candidate Optical Afterglow
  8. GRB 090305: Swift detection of a short burst
  9. GRB 090301A: Suzaku WAM observation of the prompt emission
  10. Konus-Wind observation of GRB 090301A
  11. GRB 090301A: Swift-BAT refined analysis
  12. GRB 090301: Swift detection of a burst
  13. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  14. SGR J1550-5418
  15. GRB 081211B: Nearby cluster
  16. Swift Restored
  17. Swift Trigger 343319 is not a GRB
  18. GRB090217: XRT analysis
  19. SGR activity seen by BAT during ICSP Ionospheric Events
  20. GRB 090129: Fermi GBM detection
  21. GRB 090205: Swift/UVOT Upper Limits
  22. GRB 090205: Swift-XRT refined analysis
  23. GRB 090205: Swift burst of interest
  24. GRB 090205: GROND observations and photometric redshift estimate
  25. GRB 090205: VLT candidate afterglow
  26. GRB 090205: Swift-BAT refined analysis
  27. GRB 090205: Enhanced Swift-XRT position
  28. GRB 090205: Swift detection of a burst
  29. GRB 090126A: Swift-XRT afterglow confirmation
  30. Konus-Wind observation of GRB 090201
  31. GRB 090201: Swift-XRT refined analysis
  32. GRB090201: Swift UVOT upper limits
  33. GRB 090201: object inside the enhanced XRT error circle
  34. GRB 090201: Enhanced Swift-XRT position
  35. GRB 090201: Swift-BAT refined analysis
  36. GRB 090201: VLT afterglow candidate
  37. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  38. GRB 090201: ROTSE-III Optical Limits
  39. GRB 090201: Swift detection of a burst
  40. GRB 090126A: Swift/UVOT Upper Limits
  41. GRB 090129: Swift-BAT refined analysis
  42. GRB 090129: Swift detection of a burst
  43. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  44. GRB 090126A: Swift-XRT Refined Analysis
  45. GRB 090118: no afterglow candidate
  46. GRB 090123: GROND detection
  47. 1E1547.0-5408: Swift detection of dust halo
  48. GRB 090123: Swift XRT refined analysis
  49. GRB 090123: Swift/UVOT Observations
  50. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  51. GRB 090123: Swift-BAT refined analysis
  52. GRB090123: Enhanced Swift-XRT position
  53. GRB 090123: Swift detection of a burst
  54. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  55. Swift-BAT trigger 340734 is not a GRB
  56. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  57. AXP 1E1547.0-5408: Fermi GBM observations
  58. Trigger 340734: Swift detection of a possible short burst
  59. AXP 1E1547.0-5408 activity with SGR bursts
  60. GRB 090118 (BATSS): GRT Optical Observation
  61. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  62. GRB 090118: Swift-XRT observations
  63. GRB090118 Swift/UVOT upper limits
  64. GRB 090118: GROND Upper Limits
  65. GRB 090118: Possible burst detection from Swift-BAT slew data
  66. GRB 090117: confirmation of the X-ray afterglow
  67. GRB 090117: GROND Upper Limits
  68. GRB090117 Swift/UVOT upper limits
  69. GRB090117: Swift-XRT detection of a possible candidate afterglow
  70. GRB 090113: Swift UVOT upper limits
  71. GRB 090113: GROND Upper Limits
  72. GRB 090113: Swift-XRT refined analysis
  73. GRB 090113: Observations from NOT
  74. GRB 090113: Enhanced Swift-XRT position
  75. GRB 090113: Swift-BAT refined analysis
  76. GRB 090113: ROTSE-III Optical Limits
  77. GRB090113: XRT position
  78. GRB 090113: Swift detection of a burst
  79. GRB 090111, Swift-BAT refined analysis
  80. GRB 090111: Swift UVOT Upper Limits
  81. GRB 090111: Swift-XRT refined analysis
  82. GRB 090111: Enhanced Swift-XRT position
  83. GRB 090111: Swift detection of a burst
  84. GRB 090107B: Swift XRT afterglow confirmation
  85. GRB 090107B: Swift/UVOT Observations
  86. GRB 090107B: Swift-XRT detection of possible afterglow
  87. Fermi/GBM detection of GRB 081226A
  88. GRB 090107: Swift-BAT refined analysis
  89. GRB 090107: Swift detection of a burst
  90. VLA radio upper limit on GRB 090102
  91. GRB 090102: GRT Optical Observation
  92. Swift triggered on the HMXB 1A 1118-61
  93. Konus-Wind observation of GRB 090102
  94. Swift UVOT observations of GRB 090102
  95. GRB 090102: Swift-BAT refined analysis
  96. GRB 090102: Swift burst of interest
  97. GRB 090102: Swift XRT refined analysis
  98. GRB 090102: Enhanced Swift-XRT position
  99. GRB 090102: TAROT Calern observatory optical light curve
  100. GRB 090102: Swift detection of a burst with an optical counterpart

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