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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"

38666 results found.

  1. GRB050820: refined XRT analysis
  2. GRB 050820: Early RAPTOR detections
  3. GRB 050820 Swift-BAT refined analysis
  4. GRB 050820: P60 Temporal Decay Index
  5. GRB 050820: High Resolution Spectroscopy from Keck
  6. GRB050819: refined XRT analysis
  7. GRB 050820: Swift detection of a GRB
  8. GRB050820: Optical afterglow from P60
  9. GRB 050819 Swift-BAT refined analysis
  10. GRB050819: Swift XRT position
  11. GRB050819: Swift-BAT detection of a weak burst
  12. Swift-BAT trigger 150993 is not a GRB
  13. Swift Trigger 150823 is HETE J1900.1-2455
  14. GRB 050815: Radio Observation
  15. GRB050814: Radio Observation
  16. GRB050817: Negative Optical Observations
  17. GRB050817: Swift-BAT Detection of a burst
  18. GRB 050814: continued fading
  19. GRB050815: Optical afterglow detection by Swift UVOT
  20. GRB050815: XRT refined analysis
  21. GRB 050813: Radio Observations
  22. GRB050815: Refined analysis of the Swift-BAT burst
  23. GRB 050815: ROTSE-III Optical Limits
  24. GRB050815: Swift XRT afterglow localization
  25. GRB050815: Swift-BAT detection of a burst
  26. GRB 050730: Third Epoch WSRT Radio Observations
  27. GRB050814: Fading red source
  28. GRB 050813: Gemini Spectra Revisited
  29. GRB050814: P60 Optical Afterglow Candidate
  30. GRB 050813: Non-fading of afterglow candidate
  31. GRB 050814: XRT refined analysis
  32. GRB050814: SWIFT/UVOT observation
  33. GRB050814: Refined analysis of the Swift-BAT burst
  34. GRB050813: Gemini Imaging
  35. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  36. GRB 050814: Swift XRT Afterglow Localization
  37. GRB 050814: Swift detection of a burst
  38. GRB 050813: Magellan detection of a high redshift galaxy cluster
  39. GRB050813, SDSS pre-burst observations
  40. GRB 050813: KAIT optical limit
  41. GRB 050813: Swift-BAT refined analysis
  42. GRB 050813: Photometry of object in XRT error circle
  43. GRB050813: SWIFT/UVOT observation
  44. GRB 050813: Swift XRT afterglow localization
  45. RBO GRB 050714A and GRB 050716 observations
  46. GRB 050813: Possible Short Swift-BAT GRB
  47. GRB050813 (Swift 150139): P60 Observations
  48. Swift-BAT trigger 150131 is not a GRB
  49. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  50. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  51. GRB050803: CrAO optical observations, no OT candidate
  52. Detection of an intermediate burst from SGR 1806-20 on August 8
  53. GRB 050730: WSRT Radio Observations
  54. GRB 050803: PROMPT BVRcIc Observations
  55. GRB 050807: ROTSE-III Optical Limits
  56. GRB 050730, optical observation
  57. GRB050805b: CrAO optical limit
  58. GRB050730, optical observations
  59. GRB050803, optical observations
  60. Swift-BAT trigger 149118 is very likely not a GRB
  61. Retraction of Swift Trigger 149131 (GRB 050805B)
  62. GRB050805b: MASTER optical observations
  63. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  64. GRB050805a: MASTER optical candidat
  65. Swift-BAT trigger 149118 is probably not a GRB
  66. GRB050802: TNG optical observations
  67. GRB050803: Radio Observation
  68. GRB050801: Radio Observation
  69. GRB050730: Radio Detection
  70. GRB050803: CrAO optical observations, possible OT candidate
  71. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  72. GRB 050803: Swift-BAT refined analysis
  73. GRB 050802.422: Fading of the afterglow and detection of the host
  74. GRB050803: MASTER further analys
  75. GRB 050803: Magellan Observations
  76. GRB 050803: early Swift XRT analysis results
  77. GRB050803: MASTER optical observations
  78. GRB050802: Tentative absorption redshift
  79. GRB050803: Swift-BAT detection of a very long burst
  80. GCN GRB observation 050713A
  81. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  82. GRB 050802: Swift/UVOT optical and UV detections
  83. GRB050802: CrAO optical observations
  84. GRB050801: Unchanged decay slope
  85. GRB050802 radio non-detection
  86. GRB 050802: early Swift XRT analysis results
  87. GRB 050802: Swift/UVOT observations
  88. GRB 050802 : Lulin Optical follow-up observation
  89. GRB 050802: Swift-BAT refined analysis
  90. GRB050801: Optical photometry and decay index
  91. GRB 050802: XRT position
  92. GRB 050802: Swift Gamma-ray Burst
  93. GRB050801: Swift/UVOT Optical and UV detections
  94. GRB 050730: Preliminary Analysis of MIKE Spectrum
  95. GCN 050801: early Swift XRT analysis results
  96. GRB 050801: Swift-BAT refined analysis
  97. GRB 050801, SMARTS optical/IR afterglow observations
  98. GRB 050801, afterglow observations
  99. GRB 050730, corrected photometry and break?
  100. GRB 050801: ROTSE-III Early Afterglow Break

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