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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"

32770 results found.

  1. GRB 050814: XRT refined analysis
  2. GRB050814: SWIFT/UVOT observation
  3. GRB050814: Refined analysis of the Swift-BAT burst
  4. GRB050813: Gemini Imaging
  5. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  6. GRB 050814: Swift XRT Afterglow Localization
  7. GRB 050814: Swift detection of a burst
  8. GRB 050813: Magellan detection of a high redshift galaxy cluster
  9. GRB050813: RTT150 optical observations
  10. GRB 050813: I-band observations
  11. GRB050813, SDSS pre-burst observations
  12. GRB 050813: KAIT optical limit
  13. GRB 050813: Swift-BAT refined analysis
  14. GRB 050813: Photometry of object in XRT error circle
  15. GRB050813: SWIFT/UVOT observation
  16. GRB 050813: Swift XRT afterglow localization
  17. RBO GRB 050714A and GRB 050716 observations
  18. Swift-BAT trigger 150131 is not a GRB
  19. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  20. GRB050803: CrAO optical observations, no OT candidate
  21. GRB 050730: WSRT Radio Observations
  22. GRB 050803: PROMPT BVRcIc Observations
  23. GRB 050807: ROTSE-III Optical Limits
  24. GRB 050730, optical observation
  25. GRB050805a : Null detection report
  26. GRB050730, optical observations
  27. GRB050803, optical observations
  28. GRB 050805b: TAROT optical limits
  29. GRB050802: TNG optical observations
  30. GRB050803: Radio Observation
  31. GRB 050803: RTT150 optical observations
  32. GRB050801: Radio Observation
  33. GRB050730: Radio Detection
  34. GRB050803: CrAO optical observations, possible OT candidate
  35. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  36. GRB 050803: Keck Observations
  37. GRB 050803: Swift-BAT refined analysis
  38. GRB 050802.422: Fading of the afterglow and detection of the host
  39. GRB050803: MASTER further analys
  40. GRB 050803, optical observations
  41. GRB 050803: Magellan Observations
  42. GRB 050803: early Swift XRT analysis results
  43. GRB050802: Tentative absorption redshift
  44. GCN GRB observation 050713A
  45. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  46. GRB 050802: Swift/UVOT optical and UV detections
  47. GRB050802: CrAO optical observations
  48. GRB050801: Unchanged decay slope
  49. GRB050802 radio non-detection
  50. GRB 050802: early Swift XRT analysis results
  51. GRB 050802: Swift/UVOT observations
  52. GRB 050802: Swift-BAT refined analysis
  53. GRB050801: Optical photometry and decay index
  54. GRB 050802: XRT position
  55. GRB 050802: Swift Gamma-ray Burst
  56. GRB050801: Swift/UVOT Optical and UV detections
  57. GCN 050801: early Swift XRT analysis results
  58. GRB 050801: Swift-BAT refined analysis
  59. GRB 050801, SMARTS optical/IR afterglow observations
  60. GRB 050801, afterglow observations
  61. GRB 050730, corrected photometry and break?
  62. GRB 050801: ROTSE-III Early Afterglow Break
  63. GRB050801: Swift-BAT detection of a burst
  64. GRB050801: GCN XRT position is incorrect
  65. GRB 050801: ROTSE-III Detection of Possible Counterpart
  66. GRB 050730: XRT refined analysis
  67. Correction to GCN Circ 3476 on GRB050525A
  68. GRB 050730: early TAROT optical observations
  69. GRB 050726: PROMPT Rc Observations
  70. GRB 050730: RTT150 optical observations
  71. Swift/UVOT photometry of GRB050730
  72. GRB 050730, spectra and optical photometry
  73. GRB050730: Refined BAT analysis of the Swift-BAT burst
  74. GRB 050730: Swift XRT afterglow observations
  75. GRB 050730 XMM-Newton observation
  76. GRB 050730: PROMPT VRcIc Observations
  77. GRB050730, afterglow observations
  78. GRB050730: confirmation of redshift
  79. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  80. GRB 050730, SMARTS optical/IR afterglow observations
  81. GRB050730: Liverpool Telescope optical observations
  82. GRB 050709: PROMPT Rc Observations
  83. GRB050713b: Maidanak optical observations
  84. GRB 050724: Secure Host Redshift from Keck
  85. GRB 050724: WHT optical observations
  86. GRB050726: Swift UVOT observations
  87. GRB 050724: Chandra Observations of the X-ray Afterglow
  88. GRB050724: Refined Radio Position
  89. GRB050713: analysis of the XMM-Newton observation
  90. GRB 050724, SMARTS optical/IR afterglow observations
  91. GRB 050726, SMARTS optical/IR observations
  92. Swift-BAT trigger 147918 is not a real GRB
  93. GRB050724: VLT observations of the variable source
  94. GRB050709: Second Epoch Chandra Observation
  95. GRB 050726: PROMPT Rc Observations
  96. GRB050709: Second Epoch Chandra Observation
  97. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  98. GRB050724: Further Radio Observations
  99. GRB 050726: early Swift XRT analysis results
  100. GRB050726: Swift-BAT detection of a weak burst

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