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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"

35996 results found.

  1. GRB050820a BVRcIc field photometry
  2. GRB 050820a: NIR Observations by WIRO
  3. GRB 050820B: Swift XRT position
  4. GRB050820B: Refined analysis of the Swift-BAT burst
  5. GRB050820B: BAT-Swift detection of a bright GRB
  6. GRB050820: refined XRT analysis
  7. GRB 050820: Early RAPTOR detections
  8. GRB 050820 Swift-BAT refined analysis
  9. GRB 050820: P60 Temporal Decay Index
  10. GRB 050820: High Resolution Spectroscopy from Keck
  11. GRB050819: RTT150 optical observations
  12. GRB 050820: Swift detection of a GRB
  13. GRB 050819 Swift-BAT refined analysis
  14. GRB050819: Swift XRT position
  15. GRB050819: Swift-BAT detection of a weak burst
  16. Swift-BAT trigger 150993 is not a GRB
  17. Swift Trigger 150823 is HETE J1900.1-2455
  18. GRB 050817: Optical observations
  19. GRB 050815: Radio Observation
  20. GRB050814: Radio Observation
  21. GRB050817: Negative Optical Observations
  22. GRB 050814: continued fading
  23. GRB 050813: Radio Observations
  24. GRB050815: Refined analysis of the Swift-BAT burst
  25. GRB 050815: ROTSE-III Optical Limits
  26. GRB050815: Swift XRT afterglow localization
  27. GRB 050730: Third Epoch WSRT Radio Observations
  28. GRB050814: Fading red source
  29. GRB 050813: Gemini Spectra Revisited
  30. GRB 050813: Non-fading of afterglow candidate
  31. GRB 050814: XRT refined analysis
  32. GRB050814: Refined analysis of the Swift-BAT burst
  33. GRB050813: Gemini Imaging
  34. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  35. GRB 050814: Swift XRT Afterglow Localization
  36. GRB 050814: Swift detection of a burst
  37. GRB 050813: Magellan detection of a high redshift galaxy cluster
  38. GRB050813: RTT150 optical observations
  39. GRB 050813: I-band observations
  40. GRB050813, SDSS pre-burst observations
  41. GRB 050813: KAIT optical limit
  42. GRB 050813: Swift-BAT refined analysis
  43. GRB 050813: Photometry of object in XRT error circle
  44. GRB 050813: Swift XRT afterglow localization
  45. RBO GRB 050714A and GRB 050716 observations
  46. GRB 050813: Possible Short Swift-BAT GRB
  47. Swift-BAT trigger 150131 is not a GRB
  48. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  49. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  50. GRB050803: CrAO optical observations, no OT candidate
  51. GRB 050730: WSRT Radio Observations
  52. GRB 050803: PROMPT BVRcIc Observations
  53. GRB 050807: ROTSE-III Optical Limits
  54. GRB 050730, optical observation
  55. GRB050805b: CrAO optical limit
  56. GRB050805a : Null detection report
  57. GRB050730, optical observations
  58. GRB050803, optical observations
  59. Swift-BAT trigger 149118 is very likely not a GRB
  60. Retraction of Swift Trigger 149131 (GRB 050805B)
  61. GRB 050805b: OHP optical limits
  62. GRB 050805b: TAROT optical limits
  63. GRB050805b: MASTER optical observations
  64. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  65. GRB050805a: MASTER optical candidat
  66. Swift-BAT trigger 149118 is probably not a GRB
  67. GRB 050803: RTT150 optical observations
  68. GRB050803: CrAO optical observations, possible OT candidate
  69. GRB 050803: Keck Observations
  70. GRB 050803: Swift-BAT refined analysis
  71. GRB 050802.422: Fading of the afterglow and detection of the host
  72. GRB050803: MASTER further analys
  73. GRB 050803, optical observations
  74. GRB 050803: Magellan Observations
  75. GRB 050803: early Swift XRT analysis results
  76. GRB 050803: TAROT optical limits
  77. GRB050803: MASTER optical observations
  78. GRB050802: Tentative absorption redshift
  79. GCN GRB observation 050713A
  80. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  81. GRB 050802: Swift/UVOT optical and UV detections
  82. GRB050802: CrAO optical observations
  83. GRB050801: Unchanged decay slope
  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. GRB 050730: Preliminary Analysis of MIKE Spectrum
  93. GCN 050801: early Swift XRT analysis results
  94. GRB 050801: Swift-BAT refined analysis
  95. GRB 050801, SMARTS optical/IR afterglow observations
  96. GRB 050801, afterglow observations
  97. GRB 050730, corrected photometry and break?
  98. GRB 050801: ROTSE-III Early Afterglow Break
  99. GRB050801: Swift-BAT detection of a burst
  100. GRB 050801: ROTSE-III Detection of Possible Counterpart

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