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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"

23701 results found.

  1. GRB 050826 : Lulin R band observation
  2. GRB050824: Maidanak optical limits
  3. GRB050820A: RTT150 optical observations
  4. GRB050827: RTT150 optical observations
  5. GRB 050827: Swift-BAT refined analysis
  6. GRB050827: Swift-BAT detection of a burst
  7. Subaru Observations of GRB050724
  8. GRB 050826: Optical Candidate
  9. GRB050824, HETE-2 Observation
  10. GRB 050826: Swift XRT preliminary analysis results
  11. GRB050826: Swift/UVOT early upper limits
  12. GRB050824: First 2 hours of power low optical decay?
  13. GRB050824: MASTER final analysis of the OT observations
  14. Possible GRB050825:MASTER optical observations
  15. GRB050824: CORRECTION to UVOT observing times
  16. GRB050824: Swift/UVOT detection of fading afterglow
  17. GRB 050824: Spectroscopic redshift from the VLT
  18. GRB 050822: refined XRT analysis
  19. GRB050824: MASTER:OT decay
  20. GRB050824: MASTER observation OT
  21. GRB050805a: MASTER optical candidat
  22. GRB050824: Swift-BAT detection of a burst
  23. GRB 050824 optical candidate
  24. GRB050820A: RTT150 optical observations
  25. GRB050820a: PROMPT RcIc Observations
  26. GRB050815: Maidanak optical observation
  27. VLT/UVES spectroscopy of GRB050820
  28. GRB050822: Swift/UVOT upper limits
  29. GRB 050820A BAT observations of second, larger episode of emission
  30. GRB050813: Maidanak I-band observations
  31. GRB 050822: Swift-BAT refined analysis
  32. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  33. GRB050820A: RTT150 optical observations
  34. Swift/UVOT UV Photometry of GRB 050820B
  35. GRB 050822: Swift detection of a long burst
  36. GRB050820a BVRcIc field photometry
  37. GRB050820B: Refined analysis of the Swift-BAT burst
  38. GRB050820B: BAT-Swift detection of a bright GRB
  39. Swift/UVOT photometry of GRB050820
  40. GRB050820: refined XRT analysis
  41. GRB 050820 Swift-BAT refined analysis
  42. GRB050819: refined XRT analysis
  43. GRB050819: RTT150 optical observations
  44. GRB 050820: Swift detection of a GRB
  45. GRB050819: Swift-BAT detection of a weak burst
  46. Swift Trigger 150823 is HETE J1900.1-2455
  47. GRB 050817: Optical observations
  48. GRB050815: Optical afterglow detection by Swift UVOT
  49. GRB050815: Refined analysis of the Swift-BAT burst
  50. GRB 050813: Gemini Spectra Revisited
  51. GRB050814: SWIFT/UVOT observation
  52. GRB050814: Refined analysis of the Swift-BAT burst
  53. GRB050813: Gemini Imaging
  54. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  55. GRB 050813: Magellan detection of a high redshift galaxy cluster
  56. GRB050813: RTT150 optical observations
  57. GRB 050813: I-band observations
  58. GRB050813, SDSS pre-burst observations
  59. GRB 050813: KAIT optical limit
  60. GRB 050813: Swift-BAT refined analysis
  61. GRB050813: SWIFT/UVOT observation
  62. GRB050813 (Swift 150139): P60 Observations
  63. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  64. GRB050803: CrAO optical observations, no OT candidate
  65. Detection of an intermediate burst from SGR 1806-20 on August 8
  66. GRB050805b: CrAO optical limit
  67. GRB050730, optical observations
  68. GRB050803, optical observations
  69. Swift-BAT trigger 149118 is very likely not a GRB
  70. GRB 050805b: OHP optical limits
  71. GRB 050805b: TAROT optical limits
  72. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  73. Swift-BAT trigger 149118 is probably not a GRB
  74. GRB050802: TNG optical observations
  75. GRB 050803: RTT150 optical observations
  76. GRB050803: CrAO optical observations, possible OT candidate
  77. GRB 050803: Swift-BAT refined analysis
  78. GRB050803: MASTER further analys
  79. GRB 050803: Magellan Observations
  80. GRB 050803: early Swift XRT analysis results
  81. GRB 050803: TAROT optical limits
  82. GRB050803: MASTER optical observations
  83. GRB050803: Swift-BAT detection of a very long burst
  84. GCN GRB observation 050713A
  85. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  86. GRB 050802: Swift/UVOT optical and UV detections
  87. GRB050802: CrAO optical observations
  88. GRB050801: Unchanged decay slope
  89. GRB 050730: OHP optical observations
  90. GRB 050802: early Swift XRT analysis results
  91. GRB 050802: Swift/UVOT observations
  92. GRB 050802: Swift-BAT refined analysis
  93. GRB050801: Optical photometry and decay index
  94. GRB 050802: Swift Gamma-ray Burst
  95. GRB050801: Swift/UVOT Optical and UV detections
  96. GRB 050730: Preliminary Analysis of MIKE Spectrum
  97. GCN 050801: early Swift XRT analysis results
  98. GRB 050730, corrected photometry and break?
  99. GRB050801: Swift-BAT detection of a burst
  100. GRB 050730: XRT refined analysis

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