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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"

26290 results found.

  1. Fermi GBM trigger 090305784 is not a GRB
  2. GRB 090306: Swift detection of a possible burst
  3. GRB 090305: Swift/UVOT Upper Limits
  4. GRB 090305: Swift-XRT refined analysis
  5. GRB 090305, Swift-BAT refined analysis
  6. GRB 090227A: Suzaku WAM observation of the prompt emission
  7. GRB 090305: Swift detection of a short burst
  8. GRB 090303: Fermi GBM detection
  9. GRB 090304: Fermi GBM detection
  10. GRB 090301A: Suzaku WAM observation of the prompt emission
  11. Konus-RF catches first GRB and SGR bursts
  12. GRB 090228B: Fermi GBM detection
  13. Konus-Wind observation of bright short GRB 090227B
  14. IPN localization of short bright GRB 090227B
  15. Konus-Wind observation of GRB 090301A
  16. GRB 090301A: Swift-BAT refined analysis
  17. GRB 090301B: Fermi GBM detection
  18. GRB 090227B: Fermi GBM detection
  19. GRB 090301: Swift detection of a burst
  20. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  21. GRB 090228: Fermi GBM detection
  22. GRB 090227: Fermi GBM detection
  23. GRB 090206: Fermi GBM detection
  24. SGR J1550-5418
  25. Ongoing activity of AXP/SGR 1E1547.0-5408
  26. GRB 090222: Fermi GBM detection
  27. GRB 090219: Fermi GBM detection
  28. Swift Trigger 343319 is not a GRB
  29. GRB 090217: Suzaku WAM observation of the prompt emission
  30. GRB090217: XRT analysis
  31. Konus-Wind observation of GRB 090217
  32. IPN localization of GRB 090217
  33. GRB 090213: Fermi GBM detection
  34. GRB090217: Fermi-LAT Detection
  35. GRB 090217: Fermi GBM detection
  36. SGR activity seen by BAT during ICSP Ionospheric Events
  37. GRB 090207 - Fermi GBM Observations
  38. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  39. GRB 090129: Fermi GBM detection
  40. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  41. GRB 090205: Swift/UVOT Upper Limits
  42. GRB 090205: GROND observations and photometric redshift estimate
  43. GRB 090205: Swift-BAT refined analysis
  44. GRB 090205: Swift detection of a burst
  45. GRB 090131: Suzaku WAM observation of the prompt emission
  46. GRB 090126A: Swift-XRT afterglow confirmation
  47. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  48. Konus-Wind observation of GRB 090201
  49. GRB 090202: Fermi GBM detection
  50. GRB 090131: Fermi GBM detection
  51. GRB 090201: Swift-XRT refined analysis
  52. GRB090201: Swift UVOT upper limits
  53. GRB 090201: Swift-BAT refined analysis
  54. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  55. GRB 090201: ROTSE-III Optical Limits
  56. GRB 090201: Swift detection of a burst
  57. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  58. GRB 090129: Swift-BAT refined analysis
  59. GRB 090129: Swift detection of a burst
  60. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  61. GRB 090126C: Fermi GBM detection
  62. GRB 090126A: Swift-XRT Refined Analysis
  63. GRB 090126B: Fermi GBM detection
  64. GRB 090123: GROND detection
  65. GRB 090123: Swift XRT refined analysis
  66. GRB 090123: Swift/UVOT Observations
  67. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  68. GRB 090123: Swift-BAT refined analysis
  69. GRB 090123: Swift detection of a burst
  70. Swift-BAT trigger 340734 is not a GRB
  71. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  72. GRB 090117C: Suzaku WAM observation of the prompt emission
  73. AXP 1E1547.0-5408: Fermi GBM observations
  74. Trigger 340734: Swift detection of a possible short burst
  75. AXP 1E1547.0-5408 activity with SGR bursts
  76. GRB 090118 (BATSS): GRT Optical Observation
  77. GRB 090118: GROND Upper Limits
  78. GRB 090117B : Fermi GBM detection
  79. GRB 090117C - Fermi GRB Detection
  80. GRB 090117 - Fermi GBM Observations
  81. GRB 090117: GROND Upper Limits
  82. GRB090102: MAGIC telescope GeV observation
  83. GRB 090112B: Suzaku WAM observation of the prompt emission
  84. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  85. GRB 090113: Swift UVOT upper limits
  86. GRB 090113: GROND Upper Limits
  87. GRB 090113: Swift-XRT refined analysis
  88. GRB 090113: Swift-BAT refined analysis
  89. GRB 090113: ROTSE-III Optical Limits
  90. GRB090113: XRT position
  91. GRB 090112B: Fermi GBM Detection
  92. GRB 090113: Swift detection of a burst
  93. GRB 090112: Fermi GBM detection
  94. GRB 090109: Fermi GBM detection
  95. GRB 090108B: Fermi GBM detection
  96. GRB 090111, Swift-BAT refined analysis
  97. GRB 090111: Swift UVOT Upper Limits
  98. GRB 090108: Fermi GBM Detection
  99. GRB 090111: Swift-XRT refined analysis
  100. GRB 090111: Swift detection of a burst

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