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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

16026 results found.

  1. GRB060904B: Watcher observations
  2. GRB 060904B BOOTES-IR and 1.5m OSN observations
  3. GRB 060904B: TAROT optical counterpart observations
  4. GRB 060904: TAROT optical observations
  5. GRB 060904B: Swift detection of a burst with optical counterpart
  6. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  7. GRB060901: Optical observations
  8. GRB 060901: SMARTS optical/IR observations update
  9. GRB 060901: SMARTS optical/IR observations
  10. GRB 060605, observations using an Integral Field Unit
  11. GRB 060826(?): Swift detection of a possible burst
  12. GRB060825: Liverpool Telescope optical observations
  13. GRB 060825: TNG optical observations
  14. GRB 060825: TAROT optical observations
  15. GRB060825: BOOTES-IR optical observations
  16. GRB 060729, SMARTS optical/IR observations
  17. GRB060814: Break in the XRT light curve
  18. GRB060813: Break in the XRT light curve
  19. GRB060805B: optical observations
  20. GRB060814: Swift/UVOT upper limits
  21. GRB 060814: VLT optical limits
  22. GRB 060814: TAROT optical observations
  23. GRB060813: Swift/UVOT upper limits
  24. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  25. GRB060807: Possible Highly Significant X-ray Emission Lines
  26. GRB060714: optical observations
  27. GRB 060729: An update on the Swift XRT and UVOT observations
  28. GRB060717: optical observations
  29. GRB060807: Optical limiting magnitudes
  30. GRB 060805B: optical observation at Sierra Nevada
  31. GRB 060805B: XRT Team Analysis
  32. GRB 060807: UVOT Upper limits
  33. GRB 060807: afterglow confirmation
  34. GRB 060807: K- and R-band observations
  35. GRB060807: optical afterglow candidate
  36. GRB060807: optical upper limit in white light
  37. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  38. GRB 060805B: Swift/UVOT Upper Limits
  39. GRB 060807, optical observation
  40. GRB 060807: optical limit
  41. GRB 060805: optical upper limit in R
  42. GRB 060805: Swift/UVOT Upper Limits
  43. GRB 060804: Swift UVOT observations
  44. GRB 060801: no variability of optical sources
  45. GRB 060801: WSRT Radio Observations
  46. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  47. GRB 051109B: Bright spiral host galaxy at low redshift
  48. GRB 060801: optical observations at FORS2/VLT
  49. GRB060801: Swift/UVOT Upper Limits
  50. GRB 060801: optical observations at Hanle and Calar Alto
  51. GRB060801: optical upper limit in R
  52. GRB 060801, optical observation
  53. GRB 060801: Kanazawa Optical Observation
  54. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  55. GRB 060719: TORTOREM optical upper limits
  56. GRB 060729: Swift/UVOT Detections
  57. GRB 060729: Swift/UVOT Observations
  58. GRB 060729: ROTSE-III Detection of Optical Counterpart
  59. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  60. GRB 060728: Refined analysis of the Swift-BAT burst
  61. GRB 060728, SMARTS optical/IR observations
  62. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  63. GRB 060714: Swift/UVOT Observations
  64. GRB 060714: NOT observations
  65. GRB 060719: near-infrared afterglow
  66. GRB 060719: optical limit by Pi-of-the-Sky
  67. GRB 060719: prompt PROMPT observations
  68. GRB 060719: Continued LCO optical observations
  69. GRB 060719: LCO optical observations
  70. GRB 060714: OA fading and a possible host detection
  71. GRB060714: optical observations
  72. GRB 060717: NOT observations
  73. GRB 060717 optical upper limit
  74. GRB 060717, optical observation
  75. GRB060714: optical observations
  76. GRB 060714, SMARTS optical/IR afterglow observation
  77. GRB 060714: Swift XRT refined analysis
  78. GRB 060714: OA redshift
  79. GRB 060708: VLT spectroscopy
  80. GRB060708: MARGE low resolution spectrum observations
  81. GRB060714: optical observations
  82. Correction to Circular 5314: Circular refers to GRB 060714
  83. GRB060707 possible optical confirmation
  84. GRB 060714, optical observation
  85. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  86. GRB 060605: SkyNet Optical Limits
  87. GRB060526: optical observations
  88. GRB060712: MASTER optical observation
  89. GRB120706: MASTER optical observation
  90. GRB 060708: PROMPT Optical Limits
  91. GRB 060707: OA fading and redshift
  92. GCN 060708: Swift-UVOT Observations
  93. GCN 060707: Swift-UVOT observations
  94. GRB 060707: Swift-XRT refined analysis
  95. GRB060707 possible optical confirmation
  96. GRB 060707: BOOTES-IR optical afterglow candidate
  97. GRB 060707: BOOTES-IR optical observation
  98. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  99. GRB060614: Detection of the host galaxy but no supernova emission
  100. GRB060614: Optical observations

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