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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"

37256 results found.

  1. GRB 050826: Swift XRT preliminary analysis results
  2. GRB 050826: BAT refined analysis
  3. GRB050824: First 2 hours of power low optical decay?
  4. GRB 050826: Swift XRT position
  5. GRB050826: Swift-BAT detection of a long burst
  6. GRB050824: MASTER final analysis of the OT observations
  7. Possible GRB050825:MASTER optical 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. GRB 050820A BAT observations of second, larger episode of emission
  31. GRB050813: Maidanak I-band observations
  32. GRB 050822: Swift-BAT refined analysis
  33. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  34. GRB050820B at FRAM
  35. GRB050820A: RTT150 optical observations
  36. GRB 050820a - corrections to GCN 3846
  37. Swift/UVOT UV Photometry of GRB 050820B
  38. GRB 050822: ROTSE-III Prompt Optical Limits
  39. GRB 050822: Swift detection of a long burst
  40. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  41. GRB050820A: Radio Observation
  42. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  43. GRB050820a BVRcIc field photometry
  44. GRB050820B XMM-Newton observation
  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. GRB050820: refined XRT analysis
  50. GRB 050820: Early RAPTOR detections
  51. GRB 050820 Swift-BAT refined analysis
  52. GRB 050820: P60 Temporal Decay Index
  53. GRB 050820: High Resolution Spectroscopy from Keck
  54. GRB050819: RTT150 optical observations
  55. GRB 050820: Swift detection of a GRB
  56. GRB 050819 Swift-BAT refined analysis
  57. GRB050819: Swift XRT position
  58. GRB050819: Swift-BAT detection of a weak burst
  59. Swift-BAT trigger 150993 is not a GRB
  60. Swift Trigger 150823 is HETE J1900.1-2455
  61. GRB 050817: Optical observations
  62. GRB 050815: Radio Observation
  63. GRB050814: Radio Observation
  64. GRB050817: Negative Optical Observations
  65. GRB 050814: continued fading
  66. GRB050815: XRT refined analysis
  67. GRB 050813: Radio Observations
  68. GRB050815: Refined analysis of the Swift-BAT burst
  69. GRB 050815: ROTSE-III Optical Limits
  70. GRB050815: Swift XRT afterglow localization
  71. GRB 050730: Third Epoch WSRT Radio Observations
  72. GRB050814: Fading red source
  73. GRB 050813: Gemini Spectra Revisited
  74. GRB 050813: Non-fading of afterglow candidate
  75. GRB 050814: XRT refined analysis
  76. GRB050814: Refined analysis of the Swift-BAT burst
  77. GRB050813: Gemini Imaging
  78. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  79. GRB 050814: Swift XRT Afterglow Localization
  80. GRB 050814: Swift detection of a burst
  81. GRB 050813: Magellan detection of a high redshift galaxy cluster
  82. GRB050813: RTT150 optical observations
  83. GRB 050813: I-band observations
  84. GRB050813, SDSS pre-burst observations
  85. GRB 050813: KAIT optical limit
  86. GRB 050813: Swift-BAT refined analysis
  87. GRB 050813: Photometry of object in XRT error circle
  88. GRB 050813: Swift XRT afterglow localization
  89. RBO GRB 050714A and GRB 050716 observations
  90. GRB 050813: Possible Short Swift-BAT GRB
  91. Swift-BAT trigger 150131 is not a GRB
  92. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  93. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  94. GRB050803: CrAO optical observations, no OT candidate
  95. GRB 050730: WSRT Radio Observations
  96. GRB 050803: PROMPT BVRcIc Observations
  97. GRB 050807: ROTSE-III Optical Limits
  98. GRB 050730, optical observation
  99. GRB050805b: CrAO optical limit
  100. GRB050805a : Null detection report

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