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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"

19533 results found.

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

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