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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"

45723 results found.

  1. GRB 050730, optical observation
  2. GRB050805b: CrAO optical limit
  3. GRB050805a : Null detection report
  4. GRB050730, optical observations
  5. GRB050803, optical observations
  6. Swift-BAT trigger 149118 is very likely not a GRB
  7. Retraction of Swift Trigger 149131 (GRB 050805B)
  8. GRB 050805b: OHP optical limits
  9. GRB 050805b: TAROT optical limits
  10. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  11. Swift-BAT trigger 149118 is probably not a GRB
  12. GRB050802: TNG optical observations
  13. GRB050803: Radio Observation
  14. GRB 050803: RTT150 optical observations
  15. GRB050801: Radio Observation
  16. GRB050730: Radio Detection
  17. GRB050803: CrAO optical observations, possible OT candidate
  18. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  19. GRB 050803: Keck Observations
  20. GRB 050803: Swift-BAT refined analysis
  21. GRB 050802.422: Fading of the afterglow and detection of the host
  22. GRB050803: MASTER further analys
  23. GRB 050803, optical observations
  24. GRB 050803: Magellan Observations
  25. GRB 050803: early Swift XRT analysis results
  26. GRB 050803: TAROT optical limits
  27. GRB050803: MASTER optical observations
  28. GRB050802: Tentative absorption redshift
  29. GRB050803: Swift-BAT detection of a very long burst
  30. GCN GRB observation 050713A
  31. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  32. GRB 050802: Swift/UVOT optical and UV detections
  33. GRB050802: CrAO optical observations
  34. GRB050801: Unchanged decay slope
  35. GRB050802 radio non-detection
  36. GRB 050730: OHP optical observations
  37. GRB 050802: early Swift XRT analysis results
  38. GRB 050802: Swift/UVOT observations
  39. GRB 050802 : Lulin Optical follow-up observation
  40. GRB 050802: Swift-BAT refined analysis
  41. GRB050801: Optical photometry and decay index
  42. GRB 050802: XRT position
  43. GRB 050802: Swift Gamma-ray Burst
  44. GRB050801: Swift/UVOT Optical and UV detections
  45. GRB 050730: Preliminary Analysis of MIKE Spectrum
  46. GCN 050801: early Swift XRT analysis results
  47. GRB 050801: Swift-BAT refined analysis
  48. GRB 050801, SMARTS optical/IR afterglow observations
  49. GRB 050801, afterglow observations
  50. GRB 050730, corrected photometry and break?
  51. GRB 050801: ROTSE-III Early Afterglow Break
  52. GRB050801: Swift-BAT detection of a burst
  53. GRB 050801: ROTSE-III Detection of Possible Counterpart
  54. GRB 050730: XRT refined analysis
  55. Correction to GCN Circ 3476 on GRB050525A
  56. GRB 050730: early TAROT optical observations
  57. GRB 050726: PROMPT Rc Observations
  58. GRB 050730: RTT150 optical observations
  59. Swift/UVOT photometry of GRB050730
  60. GRB 050730, spectra and optical photometry
  61. GRB050730: Refined BAT analysis of the Swift-BAT burst
  62. GRB 050730: Swift XRT afterglow observations
  63. GRB 050730 XMM-Newton observation
  64. GRB 050730: PROMPT VRcIc Observations
  65. GRB050730, afterglow observations
  66. GRB050730: confirmation of redshift
  67. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  68. GRB 050730, SMARTS optical/IR afterglow observations
  69. GRB 050730 : Planned XMM-Newton observation
  70. GRB050730: Liverpool Telescope optical observations
  71. GRB 050730, optical candidate
  72. GRB050730: Swift-BAT detection of a weak burst
  73. GRB 050713A: Swift XRT extended light curve
  74. GRB 050709: PROMPT Rc Observations
  75. GRB050713b: Maidanak optical observations
  76. GRB 050724: Secure Host Redshift from Keck
  77. GRB 050724: WHT optical observations
  78. GRB050726: Swift UVOT observations
  79. GRB 050724: Chandra Observations of the X-ray Afterglow
  80. GRB050724: Refined Radio Position
  81. GRB050713: analysis of the XMM-Newton observation
  82. GRB 050724, SMARTS optical/IR afterglow observations
  83. GRB 050726, SMARTS optical/IR observations
  84. Swift-BAT trigger 147918 is not a real GRB
  85. GRB 050727: RTT150 optical observations
  86. GRB050724: VLT observations of the variable source
  87. GRB050727: KAIT optical limit
  88. GRB050709: Second Epoch Chandra Observation
  89. GRB 050726: PROMPT Rc Observations
  90. GRB050709: Second Epoch Chandra Observation
  91. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  92. GRB050724: Further Radio Observations
  93. GRB 050726: early Swift XRT analysis results
  94. GRB050726: Swift-BAT detection of a weak burst
  95. GRB 050724: Optical Variability in Nearby Galaxy
  96. GRB 050724: J-band observations
  97. GRB 050724: GMOS Imaging and Spectroscopy
  98. GRB 050724: SWIFT XRT refined position
  99. RXTE ASM Detection of GRB050724
  100. GRB050724: Radio Observation

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