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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"

15269 results found.

  1. GRB 060908: REM optical prompt observation
  2. GRB 060904A: Suzaku/WAM observation of the prompt emission
  3. GRB060906 , optical observation
  4. GRB 060906: Swift/XRT Refined Analysis
  5. GRB 060906: Swift-UVOT observations
  6. GRB 060906: KAIT observations
  7. GRB 060904A Milagro GeV/TeV Observations
  8. Konus-Wind observation of GRB 060904A
  9. GRB 060904B: Swift-XRT refined analysis
  10. GRB060904B: Watcher observations
  11. GRB 060904B BOOTES-IR and 1.5m OSN observations
  12. GRB060904B - SDSS Pre-Burst Observations
  13. GRB060904 - SDSS Pre-Burst Observations
  14. 060901: Swift UVOT followup observations
  15. Konus-Wind observation of GRB 060901
  16. GRB 060901: further INTEGRAL results
  17. GRB 060814: Suzaku/WAM observation of the prompt emission
  18. GRB060826 - SDSS Pre-Burst Observations
  19. GRB 060825: XRT Team Refined Analysis
  20. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  21. GRB 060825: TNG optical observations
  22. GRB060801: host galaxy redshift
  23. GRB060729: analysis of XMM-Newton observation
  24. GRB 060813: A long, bright GRB detected with Suzaku WAM
  25. Konus-Wind observation of GRB 060814
  26. GRB 060814: P60 Observations
  27. GRB 060814 - SDSS Pre-Burst Observations
  28. Konus-Wind observation of GRB 060813
  29. Second VLA limit on new radio point source in SGR 1806-20
  30. GRB060807: Possible Highly Significant X-ray Emission Lines
  31. GRB060807: Optical limiting magnitudes
  32. GRB 060805B: XRT Team Analysis
  33. GRB060806 is similar to previous activity of SGR1806-20
  34. GRB 060807: UVOT Upper limits
  35. GRB060807 - SDSS Pre-burst Observations
  36. GRB 060805B: Swift/UVOT Upper Limits
  37. GRB 060805: P60 Observations
  38. GRB 060805 - SDSS Pre-Burst Observations
  39. GRB 060804: Swift UVOT observations
  40. GRB 060728: Upper limits of the X-ray emission
  41. GRB060801: Swift/UVOT Upper Limits
  42. GRB 060801, optical observation
  43. GRB 060729: Swift-XRT refined analysis
  44. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  45. GRB060719: prompt NIR observations with REM
  46. GRB 060719: correction to the coordinates reported in GCN 5347
  47. GRB 060719: VLT/ISAAC observations
  48. GRB 060719: XRT refined analysis
  49. GRB 060719: further analysis of VLT observations
  50. GRB 060719: prompt PROMPT observations
  51. GRB 060719: VLT observations
  52. GRB 060717: Swift-BAT refined analysis
  53. GRB060717 - SDSS Pre-burst Observations
  54. GRB 060714: REM infrared observations
  55. GRB060714: correction to GCN 5324
  56. GRB 060714 : Liverpool Telescope Observations
  57. GRB 060714: Swift XRT refined analysis
  58. GRB 060714, optical observation
  59. GRB060712: MASTER optical observation
  60. GRB120706: MASTER optical observation
  61. GRB 060708: Swift-XRT refined analysis
  62. GCN 060707: Swift-UVOT observations
  63. GRB 060707: Swift-XRT refined analysis
  64. GRB060707 possible optical confirmation
  65. GRB 060515: Upper Limit on Host Galaxy
  66. GRB 050223: Magellan redshift
  67. GRB060614: Detection of the host galaxy but no supernova emission
  68. GRB 060614: redshift confirmation
  69. GRB 060614: Redshift
  70. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  71. GRB060614: Optical observations
  72. Konus-Wind observation of GRB 060614
  73. GRB 060614, SMARTS optical/IR afterglow observation
  74. GRB060602A: Swift/UVOT upper limits
  75. GCN 060607: Swift-UVOT obswervations.
  76. GRB 060607: Swift-BAT Refined Analysis
  77. GRB 060607: IR observations
  78. GRB 060522: PROMPT Optical Limits
  79. GRB060605: Swift/UVOT detections
  80. GRB 060605: Swift-XRT Team refined analysis
  81. SALT spectroscopy of GRB 060605
  82. GRB 060605: ROTSE-III Optical Counterpart
  83. GRB060604: Swift/UVOT detections
  84. GRB 060604: Swift-XRT Team refined analysis
  85. GRB 060602A: Swift-BAT Refined Analysis: Correction
  86. GRB 060602B: Swift-XRT Refined Analysis
  87. GRB 060526: Tautenburg Second Epoch Observations
  88. GRB 060602B: Swift detection of a burst
  89. GRB060602 - SDSS Pre-Burst Observations
  90. GRB 060502A: Optical afterglow observations
  91. GRB 060526: Break in X-ray light curve
  92. GRB 060526: Multiple Optical Flares
  93. GRB 060526: RTT150 optical observations
  94. GRB 060526: Tautenburg OT observation and light curve fitting
  95. GRB 060526: SMARTS optical/IR afterglow observations
  96. GRB060526: possible break in the optical light curve
  97. GRB 060526: Optical Flare
  98. GRB060526: Further Swift-UVOT Observations
  99. GRB 060526: Swift/XRT Team refined analysis
  100. GRB 060526: ROTSE-III Observations of Optical Counterpart

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