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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27289 results found.

  1. ATCA observation of SGR J1550-5418
  2. GRB 090308: Swift-BAT refined analysis
  3. GRB 090308: Swift detection of a burst
  4. GRB 090306B: Possible XRT afterglow
  5. GRB 090307: Swift-XRT afterglow confirmation and analysis
  6. GRB 090307: Swift-BAT refined analysis of trigger 345551
  7. GRB 090306B: Burst detection from Swift-BAT slew data
  8. Swift Trigger 345551 is probably not a GRB
  9. Swift-BAT trigger 345396 is not a GRB
  10. IPN localization of short GRB 090305C
  11. GRB 090306: Swift detection of a possible burst
  12. GRB 090305: Swift/UVOT Upper Limits
  13. GRB 090305: Swift-XRT refined analysis
  14. GRB 090305, Swift-BAT refined analysis
  15. GRB 090305: Swift detection of a short burst
  16. GRB 090303: Fermi GBM detection
  17. GRB 090304: Fermi GBM detection
  18. GRB 090301A: Suzaku WAM observation of the prompt emission
  19. GRB 090228B: Fermi GBM detection
  20. Konus-Wind observation of GRB 090301A
  21. GRB 090301A: Swift-BAT refined analysis
  22. GRB 090301B: Fermi GBM detection
  23. GRB 090227B: Fermi GBM detection
  24. GRB 090301: Swift detection of a burst
  25. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  26. GRB 090228: Fermi GBM detection
  27. GRB 090227: Fermi GBM detection
  28. GRB 090206: Fermi GBM detection
  29. SGR J1550-5418
  30. GRB 081211B: Nearby cluster
  31. GRB 090222: Fermi GBM detection
  32. GRB 090219: Fermi GBM detection
  33. Swift Restored
  34. Swift Trigger 343319 is not a GRB
  35. GRB 090217: Suzaku WAM observation of the prompt emission
  36. GRB090217: XRT analysis
  37. GRB 090213: Fermi GBM detection
  38. GRB090217: Fermi-LAT Detection
  39. GRB 090217: Fermi GBM detection
  40. SGR activity seen by BAT during ICSP Ionospheric Events
  41. GRB 090129: Fermi GBM detection
  42. GRB 090205: Swift/UVOT Upper Limits
  43. GRB 090205: Swift-XRT refined analysis
  44. GRB 090205: Swift burst of interest
  45. GRB 090205: GROND observations and photometric redshift estimate
  46. GRB 090205: Swift-BAT refined analysis
  47. GRB 090205: Enhanced Swift-XRT position
  48. GRB 090205: Swift detection of a burst
  49. GRB 090126A: Swift-XRT afterglow confirmation
  50. Konus-Wind observation of GRB 090201
  51. GRB 090202: Fermi GBM detection
  52. GRB 090131: Fermi GBM detection
  53. GRB 090201: Swift-XRT refined analysis
  54. GRB090201: Swift UVOT upper limits
  55. GRB 090201: Enhanced Swift-XRT position
  56. GRB 090201: VLT NIR observations
  57. GRB 090201: Swift-BAT refined analysis
  58. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  59. GRB 090201: ROTSE-III Optical Limits
  60. GRB 090201: Swift detection of a burst
  61. GRB 090126A: Swift/UVOT Upper Limits
  62. GRB 090129: Swift-BAT refined analysis
  63. GRB 090129: Swift detection of a burst
  64. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  65. GRB 090126C: Fermi GBM detection
  66. GRB 090126A: Swift-XRT Refined Analysis
  67. GRB 090126B: Fermi GBM detection
  68. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  69. GRB 090118: no afterglow candidate
  70. GRB 090123: GROND detection
  71. 1E1547.0-5408: Swift detection of dust halo
  72. GRB 090123: Swift XRT refined analysis
  73. GRB 090123: Swift/UVOT Observations
  74. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  75. GRB 090123: Swift-BAT refined analysis
  76. GRB090123: Enhanced Swift-XRT position
  77. GRB 090123: Swift detection of a burst
  78. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  79. Swift-BAT trigger 340734 is not a GRB
  80. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  81. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  82. AXP 1E1547.0-5408: Fermi GBM observations
  83. Trigger 340734: Swift detection of a possible short burst
  84. AXP 1E1547.0-5408 activity with SGR bursts
  85. GRB 090118 (BATSS): GRT Optical Observation
  86. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  87. GRB 090118: Swift-XRT observations
  88. GRB090118 Swift/UVOT upper limits
  89. GRB 090118: GROND Upper Limits
  90. GRB 090118: Possible burst detection from Swift-BAT slew data
  91. GRB 090117B : Fermi GBM detection
  92. GRB 090117: confirmation of the X-ray afterglow
  93. GRB 090117C - Fermi GRB Detection
  94. GRB 090117: GROND Upper Limits
  95. GRB090117 Swift/UVOT upper limits
  96. GRB090117: Swift-XRT detection of a possible candidate afterglow
  97. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  98. GRB 090113: Swift UVOT upper limits
  99. GRB 090113: GROND Upper Limits
  100. GRB 090113: Swift-XRT refined analysis

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