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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"

19531 results found.

  1. GRB 090305, Swift-BAT refined analysis
  2. GRB 090305: Swift detection of a short burst
  3. GRB 090301A: Suzaku WAM observation of the prompt emission
  4. Konus-Wind observation of GRB 090301A
  5. GRB 090301A: Swift-BAT refined analysis
  6. GRB 090301: Swift detection of a burst
  7. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  8. SGR J1550-5418
  9. GRB 081211B: Nearby cluster
  10. Swift Restored
  11. Swift Trigger 343319 is not a GRB
  12. GRB090217: XRT analysis
  13. SGR activity seen by BAT during ICSP Ionospheric Events
  14. GRB 090129: Fermi GBM detection
  15. GRB 090205: Swift/UVOT Upper Limits
  16. GRB 090205: Swift-XRT refined analysis
  17. GRB 090205: Swift burst of interest
  18. GRB 090205: GROND observations and photometric redshift estimate
  19. GRB 090205: Swift-BAT refined analysis
  20. GRB 090205: Enhanced Swift-XRT position
  21. GRB 090205: Swift detection of a burst
  22. GRB 090126A: Swift-XRT afterglow confirmation
  23. Konus-Wind observation of GRB 090201
  24. GRB 090201: Swift-XRT refined analysis
  25. GRB090201: Swift UVOT upper limits
  26. GRB 090201: Enhanced Swift-XRT position
  27. GRB 090201: Swift-BAT refined analysis
  28. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  29. GRB 090201: ROTSE-III Optical Limits
  30. GRB 090201: Swift detection of a burst
  31. GRB 090126A: Swift/UVOT Upper Limits
  32. GRB 090129: Swift-BAT refined analysis
  33. GRB 090129: Swift detection of a burst
  34. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  35. GRB 090126A: Swift-XRT Refined Analysis
  36. GRB 090123: GROND detection
  37. 1E1547.0-5408: Swift detection of dust halo
  38. GRB 090123: Swift XRT refined analysis
  39. GRB 090123: Swift/UVOT Observations
  40. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  41. GRB 090123: Swift-BAT refined analysis
  42. GRB090123: Enhanced Swift-XRT position
  43. GRB 090123: Swift detection of a burst
  44. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  45. Swift-BAT trigger 340734 is not a GRB
  46. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  47. AXP 1E1547.0-5408: Fermi GBM observations
  48. Trigger 340734: Swift detection of a possible short burst
  49. AXP 1E1547.0-5408 activity with SGR bursts
  50. GRB 090118 (BATSS): GRT Optical Observation
  51. GRB 090118: Swift-XRT observations
  52. GRB090118 Swift/UVOT upper limits
  53. GRB 090118: GROND Upper Limits
  54. GRB 090118: Possible burst detection from Swift-BAT slew data
  55. GRB 090117: confirmation of the X-ray afterglow
  56. GRB 090117: GROND Upper Limits
  57. GRB090117 Swift/UVOT upper limits
  58. GRB090117: Swift-XRT detection of a possible candidate afterglow
  59. GRB 090113: Swift UVOT upper limits
  60. GRB 090113: GROND Upper Limits
  61. GRB 090113: Swift-XRT refined analysis
  62. GRB 090113: Enhanced Swift-XRT position
  63. GRB 090113: Swift-BAT refined analysis
  64. GRB 090113: ROTSE-III Optical Limits
  65. GRB090113: XRT position
  66. GRB 090113: Swift detection of a burst
  67. GRB 090111, Swift-BAT refined analysis
  68. GRB 090111: Swift UVOT Upper Limits
  69. GRB 090111: Swift-XRT refined analysis
  70. GRB 090111: Enhanced Swift-XRT position
  71. GRB 090111: Swift detection of a burst
  72. GRB 090107B: Swift XRT afterglow confirmation
  73. GRB 090107B: Swift/UVOT Observations
  74. GRB 090107B: Swift-XRT detection of possible afterglow
  75. Fermi/GBM detection of GRB 081226A
  76. GRB 090107: Swift-BAT refined analysis
  77. GRB 090107: Swift detection of a burst
  78. VLA radio upper limit on GRB 090102
  79. GRB 090102: GRT Optical Observation
  80. Swift triggered on the HMXB 1A 1118-61
  81. Konus-Wind observation of GRB 090102
  82. Swift UVOT observations of GRB 090102
  83. GRB 090102: Swift-BAT refined analysis
  84. GRB 090102: Swift burst of interest
  85. GRB 090102: Swift XRT refined analysis
  86. GRB 090102: Enhanced Swift-XRT position
  87. GRB 090102: TAROT Calern observatory optical light curve
  88. GRB 090102: Swift detection of a burst with an optical counterpart
  89. GRB 090102: TAROT Calern observatory optical observations
  90. GRB 081230: GROND confirmation of the afterglow
  91. GRB 081230, Swift-BAT refined analysis
  92. GRB081230: Swift-XRT refined analysis
  93. GRB 081230 Swift/UVOT Observations
  94. GRB 081230: Enhanced Swift-XRT position
  95. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  96. GRB 081230: ROTSE-III Detection of Optical Counterpart
  97. GRB 081230: Swift detection of a burst
  98. GRB 081228: GROND confirmation of the optical/NIR afterglow
  99. GRB 081228, Swift-BAT refined analysis
  100. GRB 081228: Swift/UVOT Upper Limits

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