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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"

36351 results found.

  1. GRB 050827: Optical Limit
  2. GRB 050827: XRT possible afterglow detection
  3. GRB 050826 : Lulin R band observation
  4. GRB050824: Maidanak optical limits
  5. GRB050820A: RTT150 optical observations
  6. GRB050827: RTT150 optical observations
  7. GRB 050827: Swift-BAT refined analysis
  8. GRB 050826: Optical Candidate
  9. GRB050824, HETE-2 Observation
  10. GRB 050826: Swift XRT preliminary analysis results
  11. GRB 050826: BAT refined analysis
  12. GRB050824: First 2 hours of power low optical decay?
  13. GRB 050826: Swift XRT position
  14. GRB050826: Swift-BAT detection of a long burst
  15. GRB050824: MASTER final analysis of the OT observations
  16. Possible GRB050825:MASTER optical observations
  17. Swift-BAT trigger 152038 is definitely not a GRB
  18. Swift-BAT trigger 152038 is probably not a GRB
  19. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  20. GRB050824, I-band imaging
  21. GRB050824: Radio Observations
  22. GRB 050824: Spectroscopic redshift from the VLT
  23. GRB 050822: refined XRT analysis
  24. GRB 050824: XRT refined analysis and possible afterglow detection
  25. GRB 050824: BAT refined analysis of a soft weak burst
  26. GRB050824: MASTER:OT decay
  27. GRB050824: MASTER observation OT
  28. GRB050805a: MASTER optical candidat
  29. GRB 050824: ROTSE-III Optical Limits
  30. GRB050824: Swift-BAT detection of a burst
  31. GRB 050824 optical candidate
  32. GRB050820A: RTT150 optical observations
  33. GRB050820a: PROMPT RcIc Observations
  34. GRB050815: Maidanak optical observation
  35. XRF050509c: Radio upper limits from GMRT
  36. VLT/UVES spectroscopy of GRB050820
  37. GRB 050820A BAT observations of second, larger episode of emission
  38. GRB050813: Maidanak I-band observations
  39. GRB 050822: Swift-BAT refined analysis
  40. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  41. GRB050820B at FRAM
  42. GRB050820A: RTT150 optical observations
  43. GRB 050820a - corrections to GCN 3846
  44. Swift/UVOT UV Photometry of GRB 050820B
  45. GRB 050822: ROTSE-III Prompt Optical Limits
  46. GRB 050822: Swift detection of a long burst
  47. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  48. GRB050820A: Radio Observation
  49. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  50. GRB050820a BVRcIc field photometry
  51. GRB 050820a: NIR Observations by WIRO
  52. GRB 050820B: Swift XRT position
  53. GRB050820B: Refined analysis of the Swift-BAT burst
  54. GRB050820B: BAT-Swift detection of a bright GRB
  55. GRB050820: refined XRT analysis
  56. GRB 050820: Early RAPTOR detections
  57. GRB 050820 Swift-BAT refined analysis
  58. GRB 050820: P60 Temporal Decay Index
  59. GRB 050820: High Resolution Spectroscopy from Keck
  60. GRB050819: RTT150 optical observations
  61. GRB 050820: Swift detection of a GRB
  62. GRB 050819 Swift-BAT refined analysis
  63. GRB050819: Swift XRT position
  64. GRB050819: Swift-BAT detection of a weak burst
  65. Swift-BAT trigger 150993 is not a GRB
  66. Swift Trigger 150823 is HETE J1900.1-2455
  67. GRB 050817: Optical observations
  68. GRB 050815: Radio Observation
  69. GRB050814: Radio Observation
  70. GRB050817: Negative Optical Observations
  71. GRB 050814: continued fading
  72. GRB 050813: Radio Observations
  73. GRB050815: Refined analysis of the Swift-BAT burst
  74. GRB 050815: ROTSE-III Optical Limits
  75. GRB050815: Swift XRT afterglow localization
  76. GRB 050730: Third Epoch WSRT Radio Observations
  77. GRB050814: Fading red source
  78. GRB 050813: Gemini Spectra Revisited
  79. GRB 050813: Non-fading of afterglow candidate
  80. GRB 050814: XRT refined analysis
  81. GRB050814: Refined analysis of the Swift-BAT burst
  82. GRB050813: Gemini Imaging
  83. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  84. GRB 050814: Swift XRT Afterglow Localization
  85. GRB 050814: Swift detection of a burst
  86. GRB 050813: Magellan detection of a high redshift galaxy cluster
  87. GRB050813: RTT150 optical observations
  88. GRB 050813: I-band observations
  89. GRB050813, SDSS pre-burst observations
  90. GRB 050813: KAIT optical limit
  91. GRB 050813: Swift-BAT refined analysis
  92. GRB 050813: Photometry of object in XRT error circle
  93. GRB 050813: Swift XRT afterglow localization
  94. RBO GRB 050714A and GRB 050716 observations
  95. GRB 050813: Possible Short Swift-BAT GRB
  96. Swift-BAT trigger 150131 is not a GRB
  97. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  98. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  99. GRB050803: CrAO optical observations, no OT candidate
  100. GRB 050730: WSRT Radio Observations

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