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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"

19534 results found.

  1. GRB 090531B: Fermi GBM detection
  2. Discovery of a new soft gamma repeater source, SGR 0418+5729
  3. GRB 090607: XRT Team Refined Analysis
  4. GRB 090607: Swift/UVOT Upper Limits
  5. GRB 090607: Swift-BAT refined analysis of the SHB
  6. GRB 090607: Faulkes Telescope North observations
  7. GRB 090607: Swift detection of a burst
  8. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  9. GRB 090530: RTT150 Optical Observation
  10. GRB 090529A: RTT150 Optical Observations
  11. GRB 090531B: GROND observation
  12. GRB 090530: Early RAPTOR Optical Observations
  13. GRB 090531B: Swift/BAT spectral lag results
  14. Corrections to GRB 090531B Swift/UVOT Upper Limits
  15. GRB 090531B, RIMOTS optical upper limits
  16. GRB 090531B: Swift/UVOT Upper Limits
  17. GRB 090530: GRT Optical Observation
  18. GRB 090531B: Swift-BAT refined analysis
  19. Initial Swift/UVOT observations of GRB 090531B
  20. GRB 090531B: Swift-XRT candidate afterglow position
  21. GRB 090531B: ROTSE-III Optical Limits
  22. GRB 090531B: Swift detection of a burst
  23. GRB 090531: Swift-BAT refined analysis
  24. GRB 090530: break in light curve
  25. GRB 090531: GROND upper limits
  26. GRB 090531: Swift detection of a burst
  27. GRB090530: Swift XRT refined analysis
  28. GRB090530: Swift/UVOT afterglow detection
  29. GRB 090529: Swift-XRT refined analysis
  30. GRB 090530: Enhanced Swift-XRT position
  31. GRB 090530: Swift-BAT refined analysis
  32. GRB 090530: PAIRITEL NIR Detections
  33. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  34. GRB 090530: Swift detection of a burst with an optical counterpart
  35. GRB 090529: optical observations
  36. GRB 090529: TLS Afterglow Observations
  37. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  38. GRB 090529: Swift-BAT refined analysis
  39. GRB 090529: Enhanced Swift-XRT position
  40. GRB 090529: Preliminary Swift/UVOT Upper Limit
  41. GRB 090529: Swift detection of a burst
  42. GRB 090520B: Fermi GBM detection
  43. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  44. GRB 090518: Fermi GBM detection
  45. GRB 090520 Swift-BAT detection of a burst in ground analysis
  46. GRB 090423: Fermi GBM T90 follow-up analysis results
  47. GRB 090516: Fermi GBM observation
  48. GRB 090519: Swift-XRT refined analysis
  49. GRB 090519: GROND observation
  50. GRB 090519: Swift/UVOT Upper Limits
  51. GRB 090519, Swift-BAT refined analysis
  52. GRB 090519: Enhanced Swift-XRT position
  53. GRB 090519: FARO Chante Perdrix Observatory optical observations
  54. GRB 090519: TAROT Calern observatory optical observations
  55. GRB 090519: Swift detection of a burst
  56. GRB 090518: Swift/UVOT Upper Limits
  57. GRB 090518, Swift-BAT refined analysis
  58. GRB 090516, RIMOTS optical upper limits
  59. GRB090518 : Optical upper limit by MOA-II telescope
  60. GRB 090518: Swift-XRT refined analysis
  61. GRB 090518: Enhanced Swift-XRT position
  62. GRB 090518: Swift detection of a burst
  63. GRB 090515: Swift/BAT spectral lag results
  64. GRB 090516: Swift-BAT refined analysis
  65. GRB 090516: GROND OBSERVATIONS
  66. GRB 090516 - Zadko Telescope observations
  67. GRB 090516: Swift XRT refined analysis
  68. GRB 090516: Swift/UVOT Observations
  69. GRB 090516: Enhanced Swift-XRT position
  70. GRB 090516: Faulkes Telescope South optical afterglow
  71. GRB 090516: Swift detection of a burst
  72. GRB 090515: ROVOR Upper Limit
  73. GRB 090515: MMT/MMIRS NIR Upper Limit
  74. GRB 090515: Swift/UVOT Observations
  75. GRB 090515: Swift-XRT refined analysis
  76. GRB 090515: Enhanced Swift-XRT position
  77. GRB 090509: Fermi GBM observation
  78. GRB 090515: Swift-BAT refined spectral analysis
  79. GRB 090515: Swift-BAT refined analysis
  80. GRB 090509 - Zadko Telescope observations
  81. GRB 090515: Super-LOTIS Upper Limits
  82. GRB 090515: PAIRITEL Upper Limits
  83. GRB 090515: KAIT optical upper limits
  84. GRB 090515: ROTSE-III Optical Limits
  85. GRB 090515: Swift detection of a short burst
  86. GRB 090510: Suzaku WAM observation of the prompt emission
  87. GRB090510: VLT/FORS2 spectroscopic redshift
  88. GRB 090510: GROND observations
  89. GRB 090510: Swift/UVOT host galaxy candidates
  90. GRB 090510: Fermi-LAT follow-up analysis
  91. GRB 090509, further Swift-BAT refined analysis
  92. Konus-Wind observation of GRB 090510
  93. GRB 090510: UVOT refined analysis
  94. GRB 090510: Swift XRT refined analysis
  95. GRB 090510: Enhanced Swift-XRT position
  96. GRB 090510: NOT afterglow confirmation
  97. GRB 090510: Swift-BAT refined analysis
  98. GRB 090510: Fermi GBM detection
  99. GRB 090509: Swift-BAT refined analysis
  100. Fermi LAT detection of GRB 090510

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