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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"

42872 results found.

  1. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  2. GRB050820A: Radio Observation
  3. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  4. GRB050820a BVRcIc field photometry
  5. GRB050820B XMM-Newton observation
  6. GRB 050820B: Swift XRT position
  7. GRB050820B: Refined analysis of the Swift-BAT burst
  8. GRB050820B: BAT-Swift detection of a bright GRB
  9. Swift/UVOT photometry of GRB050820
  10. GRB050820: refined XRT analysis
  11. GRB 050820: Early RAPTOR detections
  12. GRB 050820 Swift-BAT refined analysis
  13. GRB 050820: P60 Temporal Decay Index
  14. GRB 050820: High Resolution Spectroscopy from Keck
  15. GRB050819: refined XRT analysis
  16. GRB050819: RTT150 optical observations
  17. GRB 050820: Swift detection of a GRB
  18. GRB050820: Optical afterglow from P60
  19. GRB 050819 Swift-BAT refined analysis
  20. GRB050819: Swift XRT position
  21. GRB050819: Swift-BAT detection of a weak burst
  22. Swift-BAT trigger 150993 is not a GRB
  23. Swift Trigger 150823 is HETE J1900.1-2455
  24. GRB 050817: Optical observations
  25. GRB 050815: Radio Observation
  26. GRB050814: Radio Observation
  27. GRB050817: Negative Optical Observations
  28. GRB050817: Swift-BAT Detection of a burst
  29. GRB050815: Optical afterglow detection by Swift UVOT
  30. GRB050815: XRT refined analysis
  31. GRB 050813: Radio Observations
  32. GRB050815: Refined analysis of the Swift-BAT burst
  33. GRB050815: Swift XRT afterglow localization
  34. GRB050815: Swift-BAT detection of a burst
  35. GRB 050730: Third Epoch WSRT Radio Observations
  36. GRB050814: Fading red source
  37. GRB 050813: Gemini Spectra Revisited
  38. GRB050814: P60 Optical Afterglow Candidate
  39. GRB 050813: Non-fading of afterglow candidate
  40. GRB 050814: XRT refined analysis
  41. GRB050814: SWIFT/UVOT observation
  42. GRB050814: Refined analysis of the Swift-BAT burst
  43. GRB050813: Gemini Imaging
  44. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  45. GRB 050814: Swift XRT Afterglow Localization
  46. GRB 050814: Swift detection of a burst
  47. GRB 050813: Magellan detection of a high redshift galaxy cluster
  48. GRB050813: RTT150 optical observations
  49. GRB 050813: I-band observations
  50. GRB050813, SDSS pre-burst observations
  51. GRB 050813: KAIT optical limit
  52. GRB 050813: Swift-BAT refined analysis
  53. GRB 050813: Photometry of object in XRT error circle
  54. GRB050813: SWIFT/UVOT observation
  55. GRB 050813: Swift XRT afterglow localization
  56. RBO GRB 050714A and GRB 050716 observations
  57. GRB 050813: Possible Short Swift-BAT GRB
  58. GRB050813 (Swift 150139): P60 Observations
  59. Swift-BAT trigger 150131 is not a GRB
  60. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  61. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  62. GRB050803: CrAO optical observations, no OT candidate
  63. Detection of an intermediate burst from SGR 1806-20 on August 8
  64. GRB 050730: WSRT Radio Observations
  65. GRB 050803: PROMPT BVRcIc Observations
  66. GRB 050730, optical observation
  67. GRB050805b: CrAO optical limit
  68. GRB050805a : Null detection report
  69. GRB050730, optical observations
  70. GRB050803, optical observations
  71. Swift-BAT trigger 149118 is very likely not a GRB
  72. Retraction of Swift Trigger 149131 (GRB 050805B)
  73. GRB 050805b: OHP optical limits
  74. GRB 050805b: TAROT optical limits
  75. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  76. Swift-BAT trigger 149118 is probably not a GRB
  77. GRB050803: Radio Observation
  78. GRB 050803: RTT150 optical observations
  79. GRB050801: Radio Observation
  80. GRB050730: Radio Detection
  81. GRB050803: CrAO optical observations, possible OT candidate
  82. GRB 050803: Keck Observations
  83. GRB 050803: Swift-BAT refined analysis
  84. GRB 050802.422: Fading of the afterglow and detection of the host
  85. GRB 050803: Magellan Observations
  86. GRB 050803: early Swift XRT analysis results
  87. GRB 050803: TAROT optical limits
  88. GRB050802: Tentative absorption redshift
  89. GRB050803: Swift-BAT detection of a very long burst
  90. GCN GRB observation 050713A
  91. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  92. GRB 050802: Swift/UVOT optical and UV detections
  93. GRB050802: CrAO optical observations
  94. GRB050801: Unchanged decay slope
  95. GRB 050730: OHP optical observations
  96. GRB 050802: early Swift XRT analysis results
  97. GRB 050802: Swift/UVOT observations
  98. GRB 050802: Swift-BAT refined analysis
  99. GRB050801: Optical photometry and decay index
  100. GRB 050802: XRT position

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