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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"

20120 results found.

  1. GRB 060805: Swift/UVOT Upper Limits
  2. GRB 060805: P60 Observations
  3. GRB 060805 - SDSS Pre-Burst Observations
  4. GRB 060805: Swift detection of a burst
  5. GRB 060804: Swift UVOT observations
  6. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  7. GRB 060728: Upper limits of the X-ray emission
  8. GRB 060801: no variability of optical sources
  9. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  10. GRB060801: Radio Observations
  11. GRB 051109B: Bright spiral host galaxy at low redshift
  12. GRB060801: Swift/UVOT Upper Limits
  13. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  14. GRB 060801, optical observation
  15. GRB 060801: Kanazawa Optical Observation
  16. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  17. GRB 060719: TORTOREM optical upper limits
  18. GRB 060729: Swift-XRT refined analysis
  19. GRB 060729: Swift/UVOT Observations
  20. GRB 060729: ROTSE-III Detection of Optical Counterpart
  21. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  22. GRB 060728: Swift/UVOT Upper Limits
  23. GRB 060728, SMARTS optical/IR observations
  24. Swift/XRT preliminary analysis
  25. GRB 060728: Swift detection of a burst
  26. GRB 060714: Swift/UVOT Observations
  27. GRB060719: prompt NIR observations with REM
  28. GRB 060714: NOT observations
  29. GRB 060719: near-infrared afterglow
  30. GRB 060522: VLA observation
  31. GRB 060719: Swift/UVOT Upper Limits
  32. GRB 060719: VLT/ISAAC observations
  33. GRB 060719: Refined analysis of the Swift-BAT burst
  34. GRB 060719: XRT refined analysis
  35. GRB060719: REM NIR Observations
  36. GRB 060719: VLT observations
  37. GRB 060719: LCO optical observations
  38. GRB 060719: Swift detection of a burst
  39. GRB 060714: Refined analysis of the Swift-BAT burst
  40. GRB060717: Swift/UVOT upper limits
  41. GRB060717 - SDSS Pre-burst Observations
  42. GRB 060714: REM infrared observations
  43. GRB 060717, optical observation
  44. GRB 060717: Swift detection of a burst
  45. GRB 060714 : Liverpool Telescope Observations
  46. GRB 060708: VLT spectroscopy
  47. Swift trigger 219136 is probably not a GRB
  48. GRB 060714, optical observation
  49. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  50. GRB060712: P60 Observations
  51. GRB 060712: Swift/UVOT Upper Limits
  52. GRB 060712: XRT refined position
  53. GRB 060712: Refined analysis of the Swift-BAT burst
  54. GRB 060707: OA fading and redshift
  55. GCN 060708: Swift-UVOT Observations
  56. GCN 060707: Swift-UVOT observations
  57. GRB 060708: Swift detection of a burst with an UVOT countpart
  58. GRB 060707: Refined analysis of the Swift-BAT burst
  59. GRB 060515: Upper Limit on Host Galaxy
  60. GRB 060109: Upper Limit on Host Galaxy
  61. GRB 060105: Upper limit on Host Galaxy
  62. GRB 060614: Redshift
  63. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  64. GRB050326: Host Galaxy Candidates
  65. GRB050124: Possible Host Galaxy
  66. GRB050223: Host Galaxy
  67. Konus-Wind observation of GRB 060614
  68. GRB060605: optical observation
  69. GRB 060605, optical observations
  70. GRB060614: SSO 1m observations
  71. GRB 060614: Swift-BAT refined analysis
  72. GRB 060614: Swift/UVOT Observations
  73. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  74. GRB 060602A: Swift/XRT analysis
  75. GRB 060610: KAIT observations
  76. GRB 060607: RTT150 optical observations
  77. GRB 060607B: Swift-BAT Refined Analysis
  78. GRB060602A: Swift/UVOT upper limits
  79. GRB 060607B: Swift detection of a burst
  80. GCN 060607: Swift-UVOT obswervations.
  81. GRB 060607: Swift-BAT Refined Analysis
  82. GRB 060607: IR observations
  83. VLT/UVES observations of GRB 060607
  84. GRB 060605: RTT150 optical observations
  85. GRB 060607: REM NIR afterglow
  86. GRB 060607: Swift detection of a burst with bright optical counterpart
  87. GRB 060522: PROMPT Optical Limits
  88. GRB 060605: Xinglong TNT optical observations
  89. GRB060602B : REM infrared observations
  90. GRB060605: Swift/UVOT detections
  91. GRB 060605: Swift-XRT Team refined analysis
  92. GRB 060605: RTT150 optical observations
  93. GRB060604: Swift/UVOT detections
  94. GRB 060604A: ROTSE-III Optical Limits
  95. GRB 060604: Swift detection of a burst with possible optical counterpart
  96. GRB 060602B: Swift/UVOT observations
  97. GRB 060602B: RTT150 optical observations
  98. GRB 060211A : WIDGET simultaneous optical observations
  99. GRB060602A: optical observations(/transient?)
  100. GRB 060602B: Swift detection of a burst

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