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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"

42991 results found.

  1. GRB 050813: KAIT optical limit
  2. GRB 050813: Photometry of object in XRT error circle
  3. GRB050813: SWIFT/UVOT observation
  4. GRB 050813: Swift XRT afterglow localization
  5. RBO GRB 050714A and GRB 050716 observations
  6. GRB 050813: Possible Short Swift-BAT GRB
  7. GRB050813 (Swift 150139): P60 Observations
  8. Swift-BAT trigger 150131 is not a GRB
  9. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  10. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  11. GRB050803: CrAO optical observations, no OT candidate
  12. Detection of an intermediate burst from SGR 1806-20 on August 8
  13. GRB 050730: WSRT Radio Observations
  14. GRB 050803: PROMPT BVRcIc Observations
  15. GRB 050807: ROTSE-III Optical Limits
  16. GRB 050730, optical observation
  17. GRB050805a : Null detection report
  18. GRB050730, optical observations
  19. GRB050803, optical observations
  20. Swift-BAT trigger 149118 is very likely not a GRB
  21. Retraction of Swift Trigger 149131 (GRB 050805B)
  22. GRB 050805b: TAROT optical limits
  23. GRB050805b: MASTER optical observations
  24. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  25. GRB050805a: MASTER optical candidat
  26. Swift-BAT trigger 149118 is probably not a GRB
  27. GRB050802: TNG optical observations
  28. GRB 050803: RTT150 optical observations
  29. GRB050730: Radio Detection
  30. GRB050803: CrAO optical observations, possible OT candidate
  31. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  32. GRB 050803: Keck Observations
  33. GRB 050803: Swift-BAT refined analysis
  34. GRB 050802.422: Fading of the afterglow and detection of the host
  35. GRB050803: MASTER further analys
  36. GRB 050803, optical observations
  37. GRB 050803: Magellan Observations
  38. GRB 050803: early Swift XRT analysis results
  39. GRB 050803: TAROT optical limits
  40. GRB050803: MASTER optical observations
  41. GRB050802: Tentative absorption redshift
  42. GRB050803: Swift-BAT detection of a very long burst
  43. GCN GRB observation 050713A
  44. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  45. GRB 050802: Swift/UVOT optical and UV detections
  46. GRB050802: CrAO optical observations
  47. GRB 050802: early Swift XRT analysis results
  48. GRB 050802: Swift/UVOT observations
  49. GRB 050802: Swift-BAT refined analysis
  50. GRB050801: Optical photometry and decay index
  51. GRB 050802: XRT position
  52. GRB 050802: Swift Gamma-ray Burst
  53. GRB050801: Swift/UVOT Optical and UV detections
  54. GRB 050730: Preliminary Analysis of MIKE Spectrum
  55. GCN 050801: early Swift XRT analysis results
  56. GRB 050801: Swift-BAT refined analysis
  57. GRB 050801, SMARTS optical/IR afterglow observations
  58. GRB 050730, corrected photometry and break?
  59. GRB050801: Swift-BAT detection of a burst
  60. GRB050801: GCN XRT position is incorrect
  61. GRB 050730: XRT refined analysis
  62. GRB 050730: early TAROT optical observations
  63. GRB 050726: PROMPT Rc Observations
  64. GRB 050730: RTT150 optical observations
  65. Swift/UVOT photometry of GRB050730
  66. GRB 050730, spectra and optical photometry
  67. GRB050730: Refined BAT analysis of the Swift-BAT burst
  68. GRB 050730: Swift XRT afterglow observations
  69. GRB 050730 XMM-Newton observation
  70. GRB 050730: PROMPT VRcIc Observations
  71. GRB050730, afterglow observations
  72. GRB050730: confirmation of redshift
  73. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  74. GRB 050730, SMARTS optical/IR afterglow observations
  75. GRB050730: Liverpool Telescope optical observations
  76. GRB 050730, optical candidate
  77. GRB050730: Swift-BAT detection of a weak burst
  78. GRB 050713A: Swift XRT extended light curve
  79. GRB 050709: PROMPT Rc Observations
  80. GRB050713b: Maidanak optical observations
  81. GRB 050724: Secure Host Redshift from Keck
  82. GRB 050724: WHT optical observations
  83. GRB050726: Swift UVOT observations
  84. GRB 050724: Chandra Observations of the X-ray Afterglow
  85. GRB050713: analysis of the XMM-Newton observation
  86. GRB 050724, SMARTS optical/IR afterglow observations
  87. GRB 050726, SMARTS optical/IR observations
  88. Swift-BAT trigger 147918 is not a real GRB
  89. GRB050724: VLT observations of the variable source
  90. GRB050727: KAIT optical limit
  91. GRB050709: Second Epoch Chandra Observation
  92. GRB 050726: PROMPT Rc Observations
  93. GRB050709: Second Epoch Chandra Observation
  94. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  95. GRB050724: Further Radio Observations
  96. GRB 050726: early Swift XRT analysis results
  97. GRB050726: Swift-BAT detection of a weak burst
  98. GRB 050724: Optical Variability in Nearby Galaxy
  99. GRB 050724: GMOS Imaging and Spectroscopy
  100. GRB 050724: SWIFT XRT refined position

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