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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"

43004 results found.

  1. GRB050814: P60 Optical Afterglow Candidate
  2. GRB 050813: Non-fading of afterglow candidate
  3. GRB 050814: XRT refined analysis
  4. GRB050814: SWIFT/UVOT observation
  5. GRB050814: Refined analysis of the Swift-BAT burst
  6. GRB050813: Gemini Imaging
  7. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  8. GRB 050814: Swift XRT Afterglow Localization
  9. GRB 050814: Swift detection of a burst
  10. GRB 050813: Magellan detection of a high redshift galaxy cluster
  11. GRB050813: RTT150 optical observations
  12. GRB 050813: I-band observations
  13. GRB050813, SDSS pre-burst observations
  14. GRB 050813: KAIT optical limit
  15. GRB 050813: Photometry of object in XRT error circle
  16. GRB050813: SWIFT/UVOT observation
  17. GRB 050813: Swift XRT afterglow localization
  18. RBO GRB 050714A and GRB 050716 observations
  19. GRB 050813: Possible Short Swift-BAT GRB
  20. GRB050813 (Swift 150139): P60 Observations
  21. Swift-BAT trigger 150131 is not a GRB
  22. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  23. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  24. GRB050803: CrAO optical observations, no OT candidate
  25. Detection of an intermediate burst from SGR 1806-20 on August 8
  26. GRB 050730: WSRT Radio Observations
  27. GRB 050803: PROMPT BVRcIc Observations
  28. GRB 050807: ROTSE-III Optical Limits
  29. GRB 050730, optical observation
  30. GRB050805a : Null detection report
  31. GRB050730, optical observations
  32. GRB050803, optical observations
  33. Swift-BAT trigger 149118 is very likely not a GRB
  34. Retraction of Swift Trigger 149131 (GRB 050805B)
  35. GRB 050805b: TAROT optical limits
  36. GRB050805b: MASTER optical observations
  37. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  38. GRB050805a: MASTER optical candidat
  39. Swift-BAT trigger 149118 is probably not a GRB
  40. GRB050802: TNG optical observations
  41. GRB 050803: RTT150 optical observations
  42. GRB050730: Radio Detection
  43. GRB050803: CrAO optical observations, possible OT candidate
  44. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  45. GRB 050803: Keck Observations
  46. GRB 050803: Swift-BAT refined analysis
  47. GRB 050802.422: Fading of the afterglow and detection of the host
  48. GRB050803: MASTER further analys
  49. GRB 050803, optical observations
  50. GRB 050803: Magellan Observations
  51. GRB 050803: early Swift XRT analysis results
  52. GRB 050803: TAROT optical limits
  53. GRB050803: MASTER optical observations
  54. GRB050802: Tentative absorption redshift
  55. GRB050803: Swift-BAT detection of a very long burst
  56. GCN GRB observation 050713A
  57. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  58. GRB 050802: Swift/UVOT optical and UV detections
  59. GRB050802: CrAO optical observations
  60. GRB 050802: early Swift XRT analysis results
  61. GRB 050802: Swift/UVOT observations
  62. GRB 050802: Swift-BAT refined analysis
  63. GRB050801: Optical photometry and decay index
  64. GRB 050802: XRT position
  65. GRB 050802: Swift Gamma-ray Burst
  66. GRB050801: Swift/UVOT Optical and UV detections
  67. GRB 050730: Preliminary Analysis of MIKE Spectrum
  68. GCN 050801: early Swift XRT analysis results
  69. GRB 050801: Swift-BAT refined analysis
  70. GRB 050801, SMARTS optical/IR afterglow observations
  71. GRB 050730, corrected photometry and break?
  72. GRB050801: Swift-BAT detection of a burst
  73. GRB050801: GCN XRT position is incorrect
  74. GRB 050730: XRT refined analysis
  75. GRB 050730: early TAROT optical observations
  76. GRB 050726: PROMPT Rc Observations
  77. GRB 050730: RTT150 optical observations
  78. Swift/UVOT photometry of GRB050730
  79. GRB 050730, spectra and optical photometry
  80. GRB050730: Refined BAT analysis of the Swift-BAT burst
  81. GRB 050730: Swift XRT afterglow observations
  82. GRB 050730 XMM-Newton observation
  83. GRB 050730: PROMPT VRcIc Observations
  84. GRB050730, afterglow observations
  85. GRB050730: confirmation of redshift
  86. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  87. GRB 050730, SMARTS optical/IR afterglow observations
  88. GRB050730: Liverpool Telescope optical observations
  89. GRB 050730, optical candidate
  90. GRB050730: Swift-BAT detection of a weak burst
  91. GRB 050713A: Swift XRT extended light curve
  92. GRB 050709: PROMPT Rc Observations
  93. GRB050713b: Maidanak optical observations
  94. GRB 050724: Secure Host Redshift from Keck
  95. GRB 050724: WHT optical observations
  96. GRB050726: Swift UVOT observations
  97. GRB 050724: Chandra Observations of the X-ray Afterglow
  98. GRB050713: analysis of the XMM-Newton observation
  99. GRB 050724, SMARTS optical/IR afterglow observations
  100. GRB 050726, SMARTS optical/IR observations

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