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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"

42990 results found.

  1. GRB 050813: Photometry of object in XRT error circle
  2. GRB050813: SWIFT/UVOT observation
  3. GRB 050813: Swift XRT afterglow localization
  4. RBO GRB 050714A and GRB 050716 observations
  5. GRB 050813: Possible Short Swift-BAT GRB
  6. GRB050813 (Swift 150139): P60 Observations
  7. Swift-BAT trigger 150131 is not a GRB
  8. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  9. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  10. GRB050803: CrAO optical observations, no OT candidate
  11. Detection of an intermediate burst from SGR 1806-20 on August 8
  12. GRB 050730: WSRT Radio Observations
  13. GRB 050803: PROMPT BVRcIc Observations
  14. GRB 050807: ROTSE-III Optical Limits
  15. GRB 050730, optical observation
  16. GRB050805a : Null detection report
  17. GRB050730, optical observations
  18. GRB050803, optical observations
  19. Swift-BAT trigger 149118 is very likely not a GRB
  20. Retraction of Swift Trigger 149131 (GRB 050805B)
  21. GRB 050805b: TAROT optical limits
  22. GRB050805b: MASTER optical observations
  23. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  24. GRB050805a: MASTER optical candidat
  25. Swift-BAT trigger 149118 is probably not a GRB
  26. GRB050802: TNG optical observations
  27. GRB 050803: RTT150 optical observations
  28. GRB050730: Radio Detection
  29. GRB050803: CrAO optical observations, possible OT candidate
  30. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  31. GRB 050803: Keck Observations
  32. GRB 050803: Swift-BAT refined analysis
  33. GRB 050802.422: Fading of the afterglow and detection of the host
  34. GRB050803: MASTER further analys
  35. GRB 050803, optical observations
  36. GRB 050803: Magellan Observations
  37. GRB 050803: early Swift XRT analysis results
  38. GRB 050803: TAROT optical limits
  39. GRB050803: MASTER optical observations
  40. GRB050802: Tentative absorption redshift
  41. GRB050803: Swift-BAT detection of a very long burst
  42. GCN GRB observation 050713A
  43. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  44. GRB 050802: Swift/UVOT optical and UV detections
  45. GRB050802: CrAO optical observations
  46. GRB 050802: early Swift XRT analysis results
  47. GRB 050802: Swift/UVOT observations
  48. GRB 050802: Swift-BAT refined analysis
  49. GRB050801: Optical photometry and decay index
  50. GRB 050802: XRT position
  51. GRB 050802: Swift Gamma-ray Burst
  52. GRB050801: Swift/UVOT Optical and UV detections
  53. GRB 050730: Preliminary Analysis of MIKE Spectrum
  54. GCN 050801: early Swift XRT analysis results
  55. GRB 050801: Swift-BAT refined analysis
  56. GRB 050801, SMARTS optical/IR afterglow observations
  57. GRB 050730, corrected photometry and break?
  58. GRB050801: Swift-BAT detection of a burst
  59. GRB050801: GCN XRT position is incorrect
  60. GRB 050730: XRT refined analysis
  61. GRB 050730: early TAROT optical observations
  62. GRB 050726: PROMPT Rc Observations
  63. GRB 050730: RTT150 optical observations
  64. Swift/UVOT photometry of GRB050730
  65. GRB 050730, spectra and optical photometry
  66. GRB050730: Refined BAT analysis of the Swift-BAT burst
  67. GRB 050730: Swift XRT afterglow observations
  68. GRB 050730 XMM-Newton observation
  69. GRB 050730: PROMPT VRcIc Observations
  70. GRB050730, afterglow observations
  71. GRB050730: confirmation of redshift
  72. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  73. GRB 050730, SMARTS optical/IR afterglow observations
  74. GRB050730: Liverpool Telescope optical observations
  75. GRB 050730, optical candidate
  76. GRB050730: Swift-BAT detection of a weak burst
  77. GRB 050713A: Swift XRT extended light curve
  78. GRB 050709: PROMPT Rc Observations
  79. GRB050713b: Maidanak optical observations
  80. GRB 050724: Secure Host Redshift from Keck
  81. GRB 050724: WHT optical observations
  82. GRB050726: Swift UVOT observations
  83. GRB 050724: Chandra Observations of the X-ray Afterglow
  84. GRB050713: analysis of the XMM-Newton observation
  85. GRB 050724, SMARTS optical/IR afterglow observations
  86. GRB 050726, SMARTS optical/IR observations
  87. Swift-BAT trigger 147918 is not a real GRB
  88. GRB050724: VLT observations of the variable source
  89. GRB050727: KAIT optical limit
  90. GRB050709: Second Epoch Chandra Observation
  91. GRB 050726: PROMPT Rc Observations
  92. GRB050709: Second Epoch Chandra Observation
  93. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  94. GRB050724: Further Radio Observations
  95. GRB 050726: early Swift XRT analysis results
  96. GRB050726: Swift-BAT detection of a weak burst
  97. GRB 050724: Optical Variability in Nearby Galaxy
  98. GRB 050724: GMOS Imaging and Spectroscopy
  99. GRB 050724: SWIFT XRT refined position
  100. RXTE ASM Detection of GRB050724

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