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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"

41970 results found.

  1. GRB 050826 : Lulin R band observation
  2. GRB050824: Maidanak optical limits
  3. GRB050820A: RTT150 optical observations
  4. GRB050827: RTT150 optical observations
  5. GRB 050827: Swift-BAT refined analysis
  6. GRB 050826: Optical Candidate
  7. GRB050824, HETE-2 Observation
  8. GRB 050826: Swift XRT preliminary analysis results
  9. GRB 050826: BAT refined analysis
  10. GRB050826: Swift/UVOT early upper limits
  11. GRB050824: First 2 hours of power low optical decay?
  12. GRB 050826: Swift XRT position
  13. GRB050826: Swift-BAT detection of a long burst
  14. GRB050824: MASTER final analysis of the OT observations
  15. Possible GRB050825:MASTER optical observations
  16. Swift-BAT trigger 152038 is definitely not a GRB
  17. GRB050824: CORRECTION to UVOT observing times
  18. Swift-BAT trigger 152038 is probably not a GRB
  19. GRB050824: Swift/UVOT detection of fading afterglow
  20. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  21. GRB050824, I-band imaging
  22. GRB050824: Radio Observations
  23. GRB 050824: Spectroscopic redshift from the VLT
  24. GRB 050822: refined XRT analysis
  25. GRB 050824: XRT refined analysis and possible afterglow detection
  26. GRB 050824: BAT refined analysis of a soft weak burst
  27. GRB050824: MASTER:OT decay
  28. GRB050824: MASTER observation OT
  29. GRB050805a: MASTER optical candidat
  30. GRB 050824: ROTSE-III Optical Limits
  31. GRB050824: Swift-BAT detection of a burst
  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. GRB050822: Swift/UVOT upper limits
  38. GRB 050820A BAT observations of second, larger episode of emission
  39. GRB050813: Maidanak I-band observations
  40. GRB 050822: Swift-BAT refined analysis
  41. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  42. GRB050820B at FRAM
  43. GRB050820A: RTT150 optical observations
  44. GRB 050820a - corrections to GCN 3846
  45. Swift/UVOT UV Photometry of GRB 050820B
  46. GRB 050822: ROTSE-III Prompt Optical Limits
  47. GRB 050822: Swift detection of a long burst
  48. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  49. GRB050820A: Radio Observation
  50. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  51. GRB050820a BVRcIc field photometry
  52. GRB050820B XMM-Newton observation
  53. GRB 050820a: NIR Observations by WIRO
  54. GRB 050820B: Swift XRT position
  55. GRB050820B: Refined analysis of the Swift-BAT burst
  56. Swift/UVOT photometry of GRB050820
  57. GRB050820: refined XRT analysis
  58. GRB 050820: Early RAPTOR detections
  59. GRB 050820 Swift-BAT refined analysis
  60. GRB 050820: P60 Temporal Decay Index
  61. GRB 050820: High Resolution Spectroscopy from Keck
  62. GRB050819: refined XRT analysis
  63. GRB050819: RTT150 optical observations
  64. GRB 050820: Swift detection of a GRB
  65. GRB050820: Optical afterglow from P60
  66. GRB 050819 Swift-BAT refined analysis
  67. GRB050819: Swift XRT position
  68. GRB050819: Swift-BAT detection of a weak burst
  69. Swift-BAT trigger 150993 is not a GRB
  70. Swift Trigger 150823 is HETE J1900.1-2455
  71. GRB 050817: Optical observations
  72. GRB 050815: Radio Observation
  73. GRB050814: Radio Observation
  74. GRB050817: Negative Optical Observations
  75. GRB 050814: continued fading
  76. GRB050815: Optical afterglow detection by Swift UVOT
  77. GRB050815: XRT refined analysis
  78. GRB 050813: Radio Observations
  79. GRB050815: Refined analysis of the Swift-BAT burst
  80. GRB 050815: ROTSE-III Optical Limits
  81. GRB050815: Swift XRT afterglow localization
  82. GRB050815: Swift-BAT detection of a burst
  83. GRB 050730: Third Epoch WSRT Radio Observations
  84. GRB050814: Fading red source
  85. GRB 050813: Gemini Spectra Revisited
  86. GRB050814: P60 Optical Afterglow Candidate
  87. GRB 050813: Non-fading of afterglow candidate
  88. GRB 050814: XRT refined analysis
  89. GRB050814: SWIFT/UVOT observation
  90. GRB050814: Refined analysis of the Swift-BAT burst
  91. GRB050813: Gemini Imaging
  92. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  93. GRB 050814: Swift XRT Afterglow Localization
  94. GRB 050814: Swift detection of a burst
  95. GRB 050813: Magellan detection of a high redshift galaxy cluster
  96. GRB050813: RTT150 optical observations
  97. GRB 050813: I-band observations
  98. GRB050813, SDSS pre-burst observations
  99. GRB 050813: KAIT optical limit
  100. GRB 050813: Swift-BAT refined analysis

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