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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"

41904 results found.

  1. GRB 050827: Swift-BAT refined analysis
  2. GRB050827: Swift-BAT detection of a burst
  3. Subaru Observations of GRB050724
  4. GRB 050826: Optical Candidate
  5. GRB050824, HETE-2 Observation
  6. GRB 050826: Swift XRT preliminary analysis results
  7. GRB 050826: BAT refined analysis
  8. GRB050826: Swift/UVOT early upper limits
  9. GRB050824: First 2 hours of power low optical decay?
  10. GRB 050826: Swift XRT position
  11. GRB050826: Swift-BAT detection of a long burst
  12. GRB050824: MASTER final analysis of the OT observations
  13. Possible GRB050825:MASTER optical observations
  14. GRB050824: CORRECTION to UVOT observing times
  15. GRB050824: Swift/UVOT detection of fading afterglow
  16. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  17. GRB050824, I-band imaging
  18. GRB050824: Radio Observations
  19. GRB 050822: refined XRT analysis
  20. GRB 050824: XRT refined analysis and possible afterglow detection
  21. GRB 050824: BAT refined analysis of a soft weak burst
  22. GRB050824: MASTER:OT decay
  23. GRB050824: MASTER observation OT
  24. GRB050805a: MASTER optical candidat
  25. GRB 050824: ROTSE-III Optical Limits
  26. GRB050824: Swift-BAT detection of a burst
  27. GRB 050824 optical candidate
  28. GRB050820A: RTT150 optical observations
  29. GRB050820a: PROMPT RcIc Observations
  30. GRB050815: Maidanak optical observation
  31. XRF050509c: Radio upper limits from GMRT
  32. VLT/UVES spectroscopy of GRB050820
  33. GRB050822: Swift/UVOT upper limits
  34. GRB 050820A BAT observations of second, larger episode of emission
  35. GRB050813: Maidanak I-band observations
  36. GRB 050822: Swift-BAT refined analysis
  37. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  38. GRB050820A: RTT150 optical observations
  39. GRB 050820a - corrections to GCN 3846
  40. GRB 050822: ROTSE-III Prompt Optical Limits
  41. GRB 050822: Swift detection of a long burst
  42. GRB050820A: Radio Observation
  43. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  44. GRB050820a BVRcIc field photometry
  45. GRB 050820a: NIR Observations by WIRO
  46. GRB 050820B: Swift XRT position
  47. GRB050820B: Refined analysis of the Swift-BAT burst
  48. GRB050820B: BAT-Swift detection of a bright GRB
  49. Swift/UVOT photometry of GRB050820
  50. GRB050820: refined XRT analysis
  51. GRB 050820 Swift-BAT refined analysis
  52. GRB 050820: P60 Temporal Decay Index
  53. GRB 050820: High Resolution Spectroscopy from Keck
  54. GRB050819: refined XRT analysis
  55. GRB050819: RTT150 optical observations
  56. GRB 050820: Swift detection of a GRB
  57. GRB050820: Optical afterglow from P60
  58. GRB 050819 Swift-BAT refined analysis
  59. GRB050819: Swift XRT position
  60. GRB050819: Swift-BAT detection of a weak burst
  61. Swift-BAT trigger 150993 is not a GRB
  62. Swift Trigger 150823 is HETE J1900.1-2455
  63. GRB 050817: Optical observations
  64. GRB 050815: Radio Observation
  65. GRB050814: Radio Observation
  66. GRB050817: Negative Optical Observations
  67. GRB050817: Swift-BAT Detection of a burst
  68. GRB 050814: continued fading
  69. GRB050815: Optical afterglow detection by Swift UVOT
  70. GRB050815: XRT refined analysis
  71. GRB 050813: Radio Observations
  72. GRB050815: Refined analysis of the Swift-BAT burst
  73. GRB050815: Swift-BAT detection of a burst
  74. GRB 050730: Third Epoch WSRT Radio Observations
  75. GRB 050813: Gemini Spectra Revisited
  76. GRB050814: P60 Optical Afterglow Candidate
  77. GRB 050813: Non-fading of afterglow candidate
  78. GRB 050814: XRT refined analysis
  79. GRB050814: SWIFT/UVOT observation
  80. GRB050814: Refined analysis of the Swift-BAT burst
  81. GRB050813: Gemini Imaging
  82. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  83. GRB 050814: Swift detection of a burst
  84. GRB 050813: Magellan detection of a high redshift galaxy cluster
  85. GRB050813: RTT150 optical observations
  86. GRB 050813: I-band observations
  87. GRB050813, SDSS pre-burst observations
  88. GRB 050813: KAIT optical limit
  89. GRB050813: SWIFT/UVOT observation
  90. GRB 050813: Swift XRT afterglow localization
  91. RBO GRB 050714A and GRB 050716 observations
  92. GRB 050813: Possible Short Swift-BAT GRB
  93. GRB050813 (Swift 150139): P60 Observations
  94. Swift-BAT trigger 150131 is not a GRB
  95. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  96. GRB050803: CrAO optical observations, no OT candidate
  97. Detection of an intermediate burst from SGR 1806-20 on August 8
  98. GRB 050730: WSRT Radio Observations
  99. GRB 050803: PROMPT BVRcIc Observations
  100. GRB 050807: ROTSE-III Optical Limits

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