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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"

37989 results found.

  1. GRB050820: Optical afterglow from P60
  2. GRB 050819 Swift-BAT refined analysis
  3. GRB050819: Swift XRT position
  4. GRB050819: Swift-BAT detection of a weak burst
  5. Swift-BAT trigger 150993 is not a GRB
  6. Swift Trigger 150823 is HETE J1900.1-2455
  7. GRB 050817: Optical observations
  8. GRB 050815: Radio Observation
  9. GRB050814: Radio Observation
  10. GRB050817: Negative Optical Observations
  11. GRB050817: Swift-BAT Detection of a burst
  12. GRB 050814: continued fading
  13. GRB050815: Optical afterglow detection by Swift UVOT
  14. GRB050815: XRT refined analysis
  15. GRB 050813: Radio Observations
  16. GRB050815: Refined analysis of the Swift-BAT burst
  17. GRB 050815: ROTSE-III Optical Limits
  18. GRB050815: Swift XRT afterglow localization
  19. GRB050815: Swift-BAT detection of a burst
  20. GRB 050730: Third Epoch WSRT Radio Observations
  21. GRB050814: Fading red source
  22. GRB 050813: Gemini Spectra Revisited
  23. GRB050814: P60 Optical Afterglow Candidate
  24. GRB 050813: Non-fading of afterglow candidate
  25. GRB 050814: XRT refined analysis
  26. GRB050814: SWIFT/UVOT observation
  27. GRB050814: Refined analysis of the Swift-BAT burst
  28. GRB050813: Gemini Imaging
  29. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  30. GRB 050814: Swift XRT Afterglow Localization
  31. GRB 050814: Swift detection of a burst
  32. GRB 050813: Magellan detection of a high redshift galaxy cluster
  33. GRB050813: RTT150 optical observations
  34. GRB 050813: I-band observations
  35. GRB050813, SDSS pre-burst observations
  36. GRB 050813: KAIT optical limit
  37. GRB 050813: Swift-BAT refined analysis
  38. GRB 050813: Photometry of object in XRT error circle
  39. GRB050813: SWIFT/UVOT observation
  40. GRB 050813: Swift XRT afterglow localization
  41. RBO GRB 050714A and GRB 050716 observations
  42. GRB 050813: Possible Short Swift-BAT GRB
  43. GRB050813 (Swift 150139): P60 Observations
  44. Swift-BAT trigger 150131 is not a GRB
  45. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  46. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  47. GRB050803: CrAO optical observations, no OT candidate
  48. GRB 050730: WSRT Radio Observations
  49. GRB 050803: PROMPT BVRcIc Observations
  50. GRB 050807: ROTSE-III Optical Limits
  51. GRB 050730, optical observation
  52. GRB050805b: CrAO optical limit
  53. GRB050805a : Null detection report
  54. GRB050730, optical observations
  55. GRB050803, optical observations
  56. Swift-BAT trigger 149118 is very likely not a GRB
  57. Retraction of Swift Trigger 149131 (GRB 050805B)
  58. GRB 050805b: OHP optical limits
  59. GRB 050805b: TAROT optical limits
  60. GRB050805b: MASTER optical observations
  61. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  62. GRB050805a: MASTER optical candidat
  63. Swift-BAT trigger 149118 is probably not a GRB
  64. GRB 050803: RTT150 optical observations
  65. GRB050803: CrAO optical observations, possible OT candidate
  66. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  67. GRB 050803: Keck Observations
  68. GRB 050803: Swift-BAT refined analysis
  69. GRB 050802.422: Fading of the afterglow and detection of the host
  70. GRB050803: MASTER further analys
  71. GRB 050803, optical observations
  72. GRB 050803: Magellan Observations
  73. GRB 050803: early Swift XRT analysis results
  74. GRB 050803: TAROT optical limits
  75. GRB050803: MASTER optical observations
  76. GRB050802: Tentative absorption redshift
  77. GRB050803: Swift-BAT detection of a very long burst
  78. GCN GRB observation 050713A
  79. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  80. GRB 050802: Swift/UVOT optical and UV detections
  81. GRB050802: CrAO optical observations
  82. GRB050801: Unchanged decay slope
  83. GRB050802 radio non-detection
  84. GRB 050730: OHP optical observations
  85. GRB 050802: early Swift XRT analysis results
  86. GRB 050802: Swift/UVOT observations
  87. GRB 050802 : Lulin Optical follow-up observation
  88. GRB 050802: Swift-BAT refined analysis
  89. GRB050801: Optical photometry and decay index
  90. GRB 050802: XRT position
  91. GRB 050802: Swift Gamma-ray Burst
  92. GRB050801: Swift/UVOT Optical and UV detections
  93. GRB 050730: Preliminary Analysis of MIKE Spectrum
  94. GCN 050801: early Swift XRT analysis results
  95. GRB 050801: Swift-BAT refined analysis
  96. GRB 050801, SMARTS optical/IR afterglow observations
  97. GRB 050801, afterglow observations
  98. GRB 050730, corrected photometry and break?
  99. GRB 050801: ROTSE-III Early Afterglow Break
  100. GRB050801: Swift-BAT detection of a burst

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