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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"

36092 results found.

  1. GRB050820B: BAT-Swift detection of a bright GRB
  2. GRB050820: refined XRT analysis
  3. GRB 050820: Early RAPTOR detections
  4. GRB 050820 Swift-BAT refined analysis
  5. GRB 050820: P60 Temporal Decay Index
  6. GRB 050820: High Resolution Spectroscopy from Keck
  7. GRB050819: RTT150 optical observations
  8. GRB 050820: Swift detection of a GRB
  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 050817: Optical observations
  15. GRB 050815: Radio Observation
  16. GRB050814: Radio Observation
  17. GRB050817: Negative Optical Observations
  18. GRB 050814: continued fading
  19. GRB 050813: Radio Observations
  20. GRB050815: Refined analysis of the Swift-BAT burst
  21. GRB 050815: ROTSE-III Optical Limits
  22. GRB050815: Swift XRT afterglow localization
  23. GRB 050730: Third Epoch WSRT Radio Observations
  24. GRB050814: Fading red source
  25. GRB 050813: Gemini Spectra Revisited
  26. GRB 050813: Non-fading of afterglow candidate
  27. GRB 050814: XRT refined analysis
  28. GRB050814: Refined analysis of the Swift-BAT burst
  29. GRB050813: Gemini Imaging
  30. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  31. GRB 050814: Swift XRT Afterglow Localization
  32. GRB 050814: Swift detection of a burst
  33. GRB 050813: Magellan detection of a high redshift galaxy cluster
  34. GRB050813: RTT150 optical observations
  35. GRB 050813: I-band observations
  36. GRB050813, SDSS pre-burst observations
  37. GRB 050813: KAIT optical limit
  38. GRB 050813: Swift-BAT refined analysis
  39. GRB 050813: Photometry of object in XRT error circle
  40. GRB 050813: Swift XRT afterglow localization
  41. RBO GRB 050714A and GRB 050716 observations
  42. GRB 050813: Possible Short Swift-BAT GRB
  43. Swift-BAT trigger 150131 is not a GRB
  44. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  45. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  46. GRB050803: CrAO optical observations, no OT candidate
  47. GRB 050730: WSRT Radio Observations
  48. GRB 050803: PROMPT BVRcIc Observations
  49. GRB 050807: ROTSE-III Optical Limits
  50. GRB 050730, optical observation
  51. GRB050805b: CrAO optical limit
  52. GRB050805a : Null detection report
  53. GRB050730, optical observations
  54. GRB050803, optical observations
  55. Swift-BAT trigger 149118 is very likely not a GRB
  56. Retraction of Swift Trigger 149131 (GRB 050805B)
  57. GRB 050805b: OHP optical limits
  58. GRB 050805b: TAROT optical limits
  59. GRB050805b: MASTER optical observations
  60. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  61. GRB050805a: MASTER optical candidat
  62. Swift-BAT trigger 149118 is probably not a GRB
  63. GRB 050803: RTT150 optical observations
  64. GRB050803: CrAO optical observations, possible OT candidate
  65. GRB 050803: Keck Observations
  66. GRB 050803: Swift-BAT refined analysis
  67. GRB 050802.422: Fading of the afterglow and detection of the host
  68. GRB050803: MASTER further analys
  69. GRB 050803, optical observations
  70. GRB 050803: Magellan Observations
  71. GRB 050803: early Swift XRT analysis results
  72. GRB 050803: TAROT optical limits
  73. GRB050803: MASTER optical observations
  74. GRB050802: Tentative absorption redshift
  75. GCN GRB observation 050713A
  76. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  77. GRB 050802: Swift/UVOT optical and UV detections
  78. GRB050802: CrAO optical observations
  79. GRB050801: Unchanged decay slope
  80. GRB 050730: OHP optical observations
  81. GRB 050802: early Swift XRT analysis results
  82. GRB 050802: Swift/UVOT observations
  83. GRB 050802 : Lulin Optical follow-up observation
  84. GRB 050802: Swift-BAT refined analysis
  85. GRB050801: Optical photometry and decay index
  86. GRB 050802: XRT position
  87. GRB 050802: Swift Gamma-ray Burst
  88. GRB 050730: Preliminary Analysis of MIKE Spectrum
  89. GCN 050801: early Swift XRT analysis results
  90. GRB 050801: Swift-BAT refined analysis
  91. GRB 050801, SMARTS optical/IR afterglow observations
  92. GRB 050801, afterglow observations
  93. GRB 050730, corrected photometry and break?
  94. GRB 050801: ROTSE-III Early Afterglow Break
  95. GRB050801: Swift-BAT detection of a burst
  96. GRB 050801: ROTSE-III Detection of Possible Counterpart
  97. GRB 050730: XRT refined analysis
  98. Correction to GCN Circ 3476 on GRB050525A
  99. GRB 050730: early TAROT optical observations
  100. GRB 050726: PROMPT Rc Observations

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