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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"

41954 results found.

  1. GRB050730, optical observations
  2. GRB050803, optical observations
  3. Swift-BAT trigger 149118 is very likely not a GRB
  4. Retraction of Swift Trigger 149131 (GRB 050805B)
  5. GRB 050805b: TAROT optical limits
  6. GRB050805b: MASTER optical observations
  7. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  8. Swift-BAT trigger 149118 is probably not a GRB
  9. GRB050802: TNG optical observations
  10. GRB050803: Radio Observation
  11. GRB 050803: RTT150 optical observations
  12. GRB050801: Radio Observation
  13. GRB050730: Radio Detection
  14. GRB050803: CrAO optical observations, possible OT candidate
  15. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  16. GRB 050803: Keck Observations
  17. GRB 050803: Swift-BAT refined analysis
  18. GRB 050802.422: Fading of the afterglow and detection of the host
  19. GRB050803: MASTER further analys
  20. GRB 050803, optical observations
  21. GRB 050803: Magellan Observations
  22. GRB 050803: early Swift XRT analysis results
  23. GRB050802: Tentative absorption redshift
  24. GRB050803: Swift-BAT detection of a very long burst
  25. GCN GRB observation 050713A
  26. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  27. GRB 050802: Swift/UVOT optical and UV detections
  28. GRB050802: CrAO optical observations
  29. GRB050801: Unchanged decay slope
  30. GRB050802 radio non-detection
  31. GRB 050730: OHP optical observations
  32. GRB 050802: early Swift XRT analysis results
  33. GRB 050802: Swift/UVOT observations
  34. GRB 050802: Swift-BAT refined analysis
  35. GRB050801: Optical photometry and decay index
  36. GRB 050802: XRT position
  37. GRB 050802: Swift Gamma-ray Burst
  38. GRB050801: Swift/UVOT Optical and UV detections
  39. GCN 050801: early Swift XRT analysis results
  40. GRB 050801: Swift-BAT refined analysis
  41. GRB 050801, SMARTS optical/IR afterglow observations
  42. GRB 050801, afterglow observations
  43. GRB 050730, corrected photometry and break?
  44. GRB 050801: ROTSE-III Early Afterglow Break
  45. GRB050801: Swift-BAT detection of a burst
  46. GRB050801: GCN XRT position is incorrect
  47. GRB 050801: ROTSE-III Detection of Possible Counterpart
  48. GRB 050730: XRT refined analysis
  49. Correction to GCN Circ 3476 on GRB050525A
  50. GRB 050730: early TAROT optical observations
  51. GRB 050726: PROMPT Rc Observations
  52. GRB 050730: RTT150 optical observations
  53. Swift/UVOT photometry of GRB050730
  54. GRB 050730, spectra and optical photometry
  55. GRB050730: Refined BAT analysis of the Swift-BAT burst
  56. GRB 050730: Swift XRT afterglow observations
  57. GRB 050730 XMM-Newton observation
  58. GRB 050730: PROMPT VRcIc Observations
  59. GRB050730, afterglow observations
  60. GRB050730: confirmation of redshift
  61. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  62. GRB 050730, SMARTS optical/IR afterglow observations
  63. GRB050730: Liverpool Telescope optical observations
  64. GRB 050730, optical candidate
  65. GRB050730: Swift-BAT detection of a weak burst
  66. GRB 050709: PROMPT Rc Observations
  67. GRB050713b: Maidanak optical observations
  68. GRB 050724: Secure Host Redshift from Keck
  69. GRB 050724: WHT optical observations
  70. GRB050726: Swift UVOT observations
  71. GRB 050724: Chandra Observations of the X-ray Afterglow
  72. GRB050724: Refined Radio Position
  73. GRB050713: analysis of the XMM-Newton observation
  74. GRB 050724, SMARTS optical/IR afterglow observations
  75. GRB 050726, SMARTS optical/IR observations
  76. Swift-BAT trigger 147918 is not a real GRB
  77. GRB 050727: RTT150 optical observations
  78. GRB050724: VLT observations of the variable source
  79. GRB050727: KAIT optical limit
  80. GRB050709: Second Epoch Chandra Observation
  81. GRB 050726: PROMPT Rc Observations
  82. GRB050709: Second Epoch Chandra Observation
  83. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  84. GRB050724: Further Radio Observations
  85. GRB 050726: early Swift XRT analysis results
  86. GRB050726: Swift-BAT detection of a weak burst
  87. GRB 050724: Optical Variability in Nearby Galaxy
  88. GRB 050724: J-band observations
  89. GRB 050724: GMOS Imaging and Spectroscopy
  90. GRB 050724: SWIFT XRT refined position
  91. RXTE ASM Detection of GRB050724
  92. GRB050724: Radio Observation
  93. GRB 050724: spectroscopy of object in the XRT error circle
  94. GRB 050724: Optical limit
  95. GRB 050724: optical and near-IR observations
  96. GRB 050724: Optical imaging/astrometry
  97. GRB 050724: RTT150 optical observations
  98. GRB 050724: Swift/UVOT Upper Limit
  99. GRB 050724: early Swift XRT analysis results
  100. GRB 050724 : Lulin early R-band monitoring observations

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