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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"

41951 results found.

  1. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  2. GRB050824, I-band imaging
  3. GRB050824: Radio Observations
  4. GRB 050824: Spectroscopic redshift from the VLT
  5. GRB 050822: refined XRT analysis
  6. GRB 050824: XRT refined analysis and possible afterglow detection
  7. GRB 050824: BAT refined analysis of a soft weak burst
  8. GRB050824: MASTER:OT decay
  9. GRB050824: MASTER observation OT
  10. GRB050805a: MASTER optical candidat
  11. GRB 050824: ROTSE-III Optical Limits
  12. GRB050824: Swift-BAT detection of a burst
  13. GRB050820A: RTT150 optical observations
  14. GRB050820a: PROMPT RcIc Observations
  15. GRB050815: Maidanak optical observation
  16. XRF050509c: Radio upper limits from GMRT
  17. VLT/UVES spectroscopy of GRB050820
  18. GRB050822: Swift/UVOT upper limits
  19. GRB 050820A BAT observations of second, larger episode of emission
  20. GRB050813: Maidanak I-band observations
  21. GRB 050822: Swift-BAT refined analysis
  22. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  23. GRB050820B at FRAM
  24. GRB050820A: RTT150 optical observations
  25. GRB 050820a - corrections to GCN 3846
  26. Swift/UVOT UV Photometry of GRB 050820B
  27. GRB 050822: ROTSE-III Prompt Optical Limits
  28. GRB 050822: Swift detection of a long burst
  29. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  30. GRB050820A: Radio Observation
  31. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  32. GRB050820a BVRcIc field photometry
  33. GRB050820B XMM-Newton observation
  34. GRB 050820a: NIR Observations by WIRO
  35. GRB 050820B: Swift XRT position
  36. GRB050820B: Refined analysis of the Swift-BAT burst
  37. Swift/UVOT photometry of GRB050820
  38. GRB050820: refined XRT analysis
  39. GRB 050820: Early RAPTOR detections
  40. GRB 050820 Swift-BAT refined analysis
  41. GRB 050820: P60 Temporal Decay Index
  42. GRB 050820: High Resolution Spectroscopy from Keck
  43. GRB050819: refined XRT analysis
  44. GRB050819: RTT150 optical observations
  45. GRB 050820: Swift detection of a GRB
  46. GRB050820: Optical afterglow from P60
  47. GRB 050819 Swift-BAT refined analysis
  48. GRB050819: Swift XRT position
  49. GRB050819: Swift-BAT detection of a weak burst
  50. Swift-BAT trigger 150993 is not a GRB
  51. Swift Trigger 150823 is HETE J1900.1-2455
  52. GRB 050817: Optical observations
  53. GRB 050815: Radio Observation
  54. GRB050814: Radio Observation
  55. GRB050817: Negative Optical Observations
  56. GRB 050814: continued fading
  57. GRB050815: Optical afterglow detection by Swift UVOT
  58. GRB050815: XRT refined analysis
  59. GRB 050813: Radio Observations
  60. GRB050815: Refined analysis of the Swift-BAT burst
  61. GRB 050815: ROTSE-III Optical Limits
  62. GRB050815: Swift XRT afterglow localization
  63. GRB050815: Swift-BAT detection of a burst
  64. GRB 050730: Third Epoch WSRT Radio Observations
  65. GRB050814: Fading red source
  66. GRB 050813: Gemini Spectra Revisited
  67. GRB050814: P60 Optical Afterglow Candidate
  68. GRB 050813: Non-fading of afterglow candidate
  69. GRB 050814: XRT refined analysis
  70. GRB050814: SWIFT/UVOT observation
  71. GRB050814: Refined analysis of the Swift-BAT burst
  72. GRB050813: Gemini Imaging
  73. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  74. GRB 050814: Swift XRT Afterglow Localization
  75. GRB 050814: Swift detection of a burst
  76. GRB 050813: Magellan detection of a high redshift galaxy cluster
  77. GRB050813: RTT150 optical observations
  78. GRB 050813: I-band observations
  79. GRB050813, SDSS pre-burst observations
  80. GRB 050813: KAIT optical limit
  81. GRB 050813: Swift-BAT refined analysis
  82. GRB 050813: Photometry of object in XRT error circle
  83. GRB050813: SWIFT/UVOT observation
  84. GRB 050813: Swift XRT afterglow localization
  85. RBO GRB 050714A and GRB 050716 observations
  86. GRB 050813: Possible Short Swift-BAT GRB
  87. Swift-BAT trigger 150131 is not a GRB
  88. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  89. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  90. GRB050803: CrAO optical observations, no OT candidate
  91. Detection of an intermediate burst from SGR 1806-20 on August 8
  92. GRB 050730: WSRT Radio Observations
  93. GRB 050803: PROMPT BVRcIc Observations
  94. GRB 050807: ROTSE-III Optical Limits
  95. GRB 050730, optical observation
  96. GRB050805b: CrAO optical limit
  97. GRB050805a : Null detection report
  98. GRB050730, optical observations
  99. GRB050803, optical observations
  100. Swift-BAT trigger 149118 is very likely not a GRB

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