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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"

18443 results found.

  1. GRB 090307: Swift-XRT afterglow confirmation and analysis
  2. GRB 090307: Swift-BAT refined analysis of trigger 345551
  3. GRB 090306B: Burst detection from Swift-BAT slew data
  4. Swift Trigger 345551 is probably not a GRB
  5. Swift-BAT trigger 345396 is not a GRB
  6. IPN localization of short GRB 090305C
  7. GRB 090306: Swift detection of a possible burst
  8. GRB 090305: Swift/UVOT Upper Limits
  9. GRB 090305: Swift-XRT refined analysis
  10. GRB 090305, Swift-BAT refined analysis
  11. GRB 090305: Swift detection of a short burst
  12. GRB 090301A: Suzaku WAM observation of the prompt emission
  13. Konus-Wind observation of GRB 090301A
  14. GRB 090301A: Swift-BAT refined analysis
  15. GRB 090301: Swift detection of a burst
  16. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  17. SGR J1550-5418
  18. GRB 081211B: Nearby cluster
  19. Swift Restored
  20. Swift Trigger 343319 is not a GRB
  21. GRB090217: XRT analysis
  22. SGR activity seen by BAT during ICSP Ionospheric Events
  23. GRB 090129: Fermi GBM detection
  24. GRB 090205: Swift/UVOT Upper Limits
  25. GRB 090205: Swift-XRT refined analysis
  26. GRB 090205: Swift burst of interest
  27. GRB 090205: GROND observations and photometric redshift estimate
  28. GRB 090205: Swift-BAT refined analysis
  29. GRB 090205: Enhanced Swift-XRT position
  30. GRB 090205: Swift detection of a burst
  31. GRB 090126A: Swift-XRT afterglow confirmation
  32. Konus-Wind observation of GRB 090201
  33. GRB 090201: Swift-XRT refined analysis
  34. GRB090201: Swift UVOT upper limits
  35. GRB 090201: Enhanced Swift-XRT position
  36. GRB 090201: Swift-BAT refined analysis
  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 090123: GROND detection
  46. 1E1547.0-5408: Swift detection of dust halo
  47. GRB 090123: Swift XRT refined analysis
  48. GRB 090123: Swift/UVOT Observations
  49. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  50. GRB 090123: Swift-BAT refined analysis
  51. GRB090123: Enhanced Swift-XRT position
  52. GRB 090123: Swift detection of a burst
  53. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  54. Swift-BAT trigger 340734 is not a GRB
  55. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  56. AXP 1E1547.0-5408: Fermi GBM observations
  57. Trigger 340734: Swift detection of a possible short burst
  58. AXP 1E1547.0-5408 activity with SGR bursts
  59. GRB 090118 (BATSS): GRT Optical Observation
  60. GRB 090118: Swift-XRT observations
  61. GRB090118 Swift/UVOT upper limits
  62. GRB 090118: GROND Upper Limits
  63. GRB 090118: Possible burst detection from Swift-BAT slew data
  64. GRB 090117: confirmation of the X-ray afterglow
  65. GRB 090117: GROND Upper Limits
  66. GRB090117 Swift/UVOT upper limits
  67. GRB090117: Swift-XRT detection of a possible candidate afterglow
  68. GRB 090113: Swift UVOT upper limits
  69. GRB 090113: GROND Upper Limits
  70. GRB 090113: Swift-XRT refined analysis
  71. GRB 090113: Enhanced Swift-XRT position
  72. GRB 090113: Swift-BAT refined analysis
  73. GRB 090113: ROTSE-III Optical Limits
  74. GRB090113: XRT position
  75. GRB 090113: Swift detection of a burst
  76. GRB 090111, Swift-BAT refined analysis
  77. GRB 090111: Swift UVOT Upper Limits
  78. GRB 090111: Swift-XRT refined analysis
  79. GRB 090111: Enhanced Swift-XRT position
  80. GRB 090111: Swift detection of a burst
  81. GRB 090107B: Swift XRT afterglow confirmation
  82. GRB 090107B: Swift/UVOT Observations
  83. GRB 090107B: Swift-XRT detection of possible afterglow
  84. Fermi/GBM detection of GRB 081226A
  85. GRB 090107: Swift-BAT refined analysis
  86. GRB 090107: Swift detection of a burst
  87. VLA radio upper limit on GRB 090102
  88. GRB 090102: GRT Optical Observation
  89. Swift triggered on the HMXB 1A 1118-61
  90. Konus-Wind observation of GRB 090102
  91. Swift UVOT observations of GRB 090102
  92. GRB 090102: Swift-BAT refined analysis
  93. GRB 090102: Swift burst of interest
  94. GRB 090102: Swift XRT refined analysis
  95. GRB 090102: Enhanced Swift-XRT position
  96. GRB 090102: TAROT Calern observatory optical light curve
  97. GRB 090102: Swift detection of a burst with an optical counterpart
  98. GRB 090102: TAROT Calern observatory optical observations
  99. GRB 081230: GROND confirmation of the afterglow
  100. GRB 081230, Swift-BAT refined analysis

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