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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"

45733 results found.

  1. GRB 050826: Swift XRT preliminary analysis results
  2. GRB 050826: BAT refined analysis
  3. GRB050826: Swift/UVOT early upper limits
  4. GRB050824: First 2 hours of power low optical decay?
  5. GRB 050826: Swift XRT position
  6. GRB050826: Swift-BAT detection of a long burst
  7. GRB050824: MASTER final analysis of the OT observations
  8. Swift-BAT trigger 152038 is definitely not a GRB
  9. GRB050824: CORRECTION to UVOT observing times
  10. Swift-BAT trigger 152038 is probably not a GRB
  11. GRB050824: Swift/UVOT detection of fading afterglow
  12. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  13. GRB050824, I-band imaging
  14. GRB050824: Radio Observations
  15. GRB 050824: Spectroscopic redshift from the VLT
  16. GRB 050822: refined XRT analysis
  17. GRB 050824: XRT refined analysis and possible afterglow detection
  18. GRB 050824: BAT refined analysis of a soft weak burst
  19. GRB050824: MASTER:OT decay
  20. GRB050824: MASTER observation OT
  21. GRB050805a: MASTER optical candidat
  22. GRB 050824: ROTSE-III Optical Limits
  23. GRB050824: Swift-BAT detection of a burst
  24. GRB 050824 optical candidate
  25. GRB050820A: RTT150 optical observations
  26. GRB050820a: PROMPT RcIc Observations
  27. GRB050815: Maidanak optical observation
  28. XRF050509c: Radio upper limits from GMRT
  29. VLT/UVES spectroscopy of GRB050820
  30. GRB050822: Swift/UVOT upper limits
  31. GRB 050820A BAT observations of second, larger episode of emission
  32. GRB050813: Maidanak I-band observations
  33. GRB 050822: Swift-BAT refined analysis
  34. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  35. GRB050820B at FRAM
  36. GRB050820A: RTT150 optical observations
  37. GRB 050820a - corrections to GCN 3846
  38. Swift/UVOT UV Photometry of GRB 050820B
  39. GRB 050822: ROTSE-III Prompt Optical Limits
  40. GRB 050822: Swift detection of a long burst
  41. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  42. GRB050820A: Radio Observation
  43. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  44. GRB050820a BVRcIc field photometry
  45. GRB050820B XMM-Newton observation
  46. GRB 050820a: NIR Observations by WIRO
  47. GRB 050820B: Swift XRT position
  48. GRB050820B: Planned XMM-Newton observation
  49. GRB050820B: Refined analysis of the Swift-BAT burst
  50. GRB050820B: BAT-Swift detection of a bright GRB
  51. Swift/UVOT photometry of GRB050820
  52. GRB050820: refined XRT analysis
  53. GRB 050820: Early RAPTOR detections
  54. GRB 050820 Swift-BAT refined analysis
  55. GRB 050820: P60 Temporal Decay Index
  56. GRB 050820: High Resolution Spectroscopy from Keck
  57. GRB050819: refined XRT analysis
  58. GRB050819: RTT150 optical observations
  59. GRB 050820: Swift detection of a GRB
  60. GRB050820: Optical afterglow from P60
  61. GRB 050819 Swift-BAT refined analysis
  62. GRB050819: Swift XRT position
  63. GRB050819: Swift-BAT detection of a weak burst
  64. Swift-BAT trigger 150993 is not a GRB
  65. Swift Trigger 150823 is HETE J1900.1-2455
  66. GRB 050817: Optical observations
  67. GRB 050815: Radio Observation
  68. GRB050814: Radio Observation
  69. GRB050817: Negative Optical Observations
  70. GRB050817: Swift-BAT Detection of a burst
  71. GRB 050814: continued fading
  72. GRB050815: Optical afterglow detection by Swift UVOT
  73. GRB050815: XRT refined analysis
  74. GRB 050813: Radio Observations
  75. GRB050815: Refined analysis of the Swift-BAT burst
  76. GRB 050815: ROTSE-III Optical Limits
  77. GRB050815: Swift XRT afterglow localization
  78. GRB050815: Swift-BAT detection of a burst
  79. GRB 050730: Third Epoch WSRT Radio Observations
  80. GRB050814: Fading red source
  81. GRB 050813: Gemini Spectra Revisited
  82. GRB050814: P60 Optical Afterglow Candidate
  83. GRB 050813: Non-fading of afterglow candidate
  84. GRB 050814: XRT refined analysis
  85. GRB050814: SWIFT/UVOT observation
  86. GRB050814: Refined analysis of the Swift-BAT burst
  87. GRB050813: Gemini Imaging
  88. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  89. GRB 050814: Swift XRT Afterglow Localization
  90. GRB 050814: Swift detection of a burst
  91. GRB 050813: Magellan detection of a high redshift galaxy cluster
  92. GRB050813: RTT150 optical observations
  93. GRB 050813: I-band observations
  94. GRB050813, SDSS pre-burst observations
  95. GRB 050813: KAIT optical limit
  96. GRB 050813: Swift-BAT refined analysis
  97. GRB 050813: Photometry of object in XRT error circle
  98. GRB050813: SWIFT/UVOT observation
  99. GRB 050813: Swift XRT afterglow localization
  100. RBO GRB 050714A and GRB 050716 observations

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