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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"

42976 results found.

  1. GRB 050826: Optical Candidate
  2. GRB050824, HETE-2 Observation
  3. GRB 050826: Swift XRT preliminary analysis results
  4. GRB 050826: BAT refined analysis
  5. GRB050826: Swift/UVOT early upper limits
  6. GRB050824: First 2 hours of power low optical decay?
  7. GRB050826: Swift-BAT detection of a long burst
  8. GRB050824: MASTER final analysis of the OT observations
  9. Possible GRB050825:MASTER optical observations
  10. GRB050824: CORRECTION to UVOT observing times
  11. Swift-BAT trigger 152038 is probably not a GRB
  12. GRB050824: Swift/UVOT detection of fading afterglow
  13. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  14. GRB050824, I-band imaging
  15. GRB050824: Radio Observations
  16. GRB 050824: Spectroscopic redshift from the VLT
  17. GRB 050822: refined XRT analysis
  18. GRB 050824: XRT refined analysis and possible afterglow detection
  19. GRB 050824: BAT refined analysis of a soft weak burst
  20. GRB 050824: ROTSE-III Optical Limits
  21. GRB050824: Swift-BAT detection of a burst
  22. GRB050820A: RTT150 optical observations
  23. GRB050820a: PROMPT RcIc Observations
  24. XRF050509c: Radio upper limits from GMRT
  25. VLT/UVES spectroscopy of GRB050820
  26. GRB050822: Swift/UVOT upper limits
  27. GRB 050820A BAT observations of second, larger episode of emission
  28. GRB 050822: Swift-BAT refined analysis
  29. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  30. GRB050820B at FRAM
  31. GRB050820A: RTT150 optical observations
  32. GRB 050820a - corrections to GCN 3846
  33. Swift/UVOT UV Photometry of GRB 050820B
  34. GRB 050822: ROTSE-III Prompt Optical Limits
  35. GRB 050822: Swift detection of a long burst
  36. GRB050820A: Radio Observation
  37. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  38. GRB050820a BVRcIc field photometry
  39. GRB050820B XMM-Newton observation
  40. GRB 050820a: NIR Observations by WIRO
  41. GRB 050820B: Swift XRT position
  42. GRB050820B: Refined analysis of the Swift-BAT burst
  43. GRB050820B: BAT-Swift detection of a bright GRB
  44. Swift/UVOT photometry of GRB050820
  45. GRB050820: refined XRT analysis
  46. GRB 050820: Early RAPTOR detections
  47. GRB 050820 Swift-BAT refined analysis
  48. GRB 050820: P60 Temporal Decay Index
  49. GRB 050820: High Resolution Spectroscopy from Keck
  50. GRB050819: refined XRT analysis
  51. GRB050819: RTT150 optical observations
  52. GRB 050820: Swift detection of a GRB
  53. GRB050820: Optical afterglow from P60
  54. GRB050819: Swift-BAT detection of a weak burst
  55. Swift-BAT trigger 150993 is not a GRB
  56. Swift Trigger 150823 is HETE J1900.1-2455
  57. GRB 050817: Optical observations
  58. GRB 050815: Radio Observation
  59. GRB050814: Radio Observation
  60. GRB050817: Negative Optical Observations
  61. GRB050817: Swift-BAT Detection of a burst
  62. GRB 050814: continued fading
  63. GRB050815: Optical afterglow detection by Swift UVOT
  64. GRB050815: XRT refined analysis
  65. GRB 050813: Radio Observations
  66. GRB050815: Refined analysis of the Swift-BAT burst
  67. GRB 050815: ROTSE-III Optical Limits
  68. GRB050815: Swift XRT afterglow localization
  69. GRB050815: Swift-BAT detection of a burst
  70. GRB 050730: Third Epoch WSRT Radio Observations
  71. GRB050814: Fading red source
  72. GRB 050813: Gemini Spectra Revisited
  73. GRB050814: P60 Optical Afterglow Candidate
  74. GRB 050813: Non-fading of afterglow candidate
  75. GRB 050814: XRT refined analysis
  76. GRB050814: SWIFT/UVOT observation
  77. GRB050814: Refined analysis of the Swift-BAT burst
  78. GRB050813: Gemini Imaging
  79. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  80. GRB 050814: Swift XRT Afterglow Localization
  81. GRB 050814: Swift detection of a burst
  82. GRB 050813: Magellan detection of a high redshift galaxy cluster
  83. GRB050813: RTT150 optical observations
  84. GRB 050813: I-band observations
  85. GRB050813, SDSS pre-burst observations
  86. GRB 050813: KAIT optical limit
  87. GRB 050813: Photometry of object in XRT error circle
  88. GRB050813: SWIFT/UVOT observation
  89. GRB 050813: Swift XRT afterglow localization
  90. RBO GRB 050714A and GRB 050716 observations
  91. GRB 050813: Possible Short Swift-BAT GRB
  92. GRB050813 (Swift 150139): P60 Observations
  93. Swift-BAT trigger 150131 is not a GRB
  94. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  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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