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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"

32757 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. Swift-BAT trigger 150131 is not a GRB
  6. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  7. GRB050803: CrAO optical observations, no OT candidate
  8. GRB 050730: WSRT Radio Observations
  9. GRB 050803: PROMPT BVRcIc Observations
  10. GRB 050807: ROTSE-III Optical Limits
  11. GRB 050730, optical observation
  12. GRB050805a : Null detection report
  13. GRB050730, optical observations
  14. GRB050803, optical observations
  15. GRB 050805b: TAROT optical limits
  16. GRB050802: TNG optical observations
  17. GRB050803: Radio Observation
  18. GRB 050803: RTT150 optical observations
  19. GRB050801: Radio Observation
  20. GRB050730: Radio Detection
  21. GRB050803: CrAO optical observations, possible OT candidate
  22. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  23. GRB 050803: Keck Observations
  24. GRB 050803: Swift-BAT refined analysis
  25. GRB 050802.422: Fading of the afterglow and detection of the host
  26. GRB050803: MASTER further analys
  27. GRB 050803, optical observations
  28. GRB 050803: Magellan Observations
  29. GRB 050803: early Swift XRT analysis results
  30. GRB050802: Tentative absorption redshift
  31. GCN GRB observation 050713A
  32. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  33. GRB 050802: Swift/UVOT optical and UV detections
  34. GRB050802: CrAO optical observations
  35. GRB050801: Unchanged decay slope
  36. GRB050802 radio non-detection
  37. GRB 050802: early Swift XRT analysis results
  38. GRB 050802: Swift/UVOT observations
  39. GRB 050802: Swift-BAT refined analysis
  40. GRB050801: Optical photometry and decay index
  41. GRB 050802: XRT position
  42. GRB 050802: Swift Gamma-ray Burst
  43. GRB050801: Swift/UVOT Optical and UV detections
  44. GCN 050801: early Swift XRT analysis results
  45. GRB 050801: Swift-BAT refined analysis
  46. GRB 050801, SMARTS optical/IR afterglow observations
  47. GRB 050801, afterglow observations
  48. GRB 050730, corrected photometry and break?
  49. GRB 050801: ROTSE-III Early Afterglow Break
  50. GRB050801: Swift-BAT detection of a burst
  51. GRB050801: GCN XRT position is incorrect
  52. GRB 050801: ROTSE-III Detection of Possible Counterpart
  53. GRB 050730: XRT refined analysis
  54. Correction to GCN Circ 3476 on GRB050525A
  55. GRB 050730: early TAROT optical observations
  56. GRB 050726: PROMPT Rc Observations
  57. GRB 050730: RTT150 optical observations
  58. Swift/UVOT photometry of GRB050730
  59. GRB 050730, spectra and optical photometry
  60. GRB050730: Refined BAT analysis of the Swift-BAT burst
  61. GRB 050730: Swift XRT afterglow observations
  62. GRB 050730 XMM-Newton observation
  63. GRB 050730: PROMPT VRcIc Observations
  64. GRB050730, afterglow observations
  65. GRB050730: confirmation of redshift
  66. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  67. GRB 050730, SMARTS optical/IR afterglow observations
  68. GRB050730: Liverpool Telescope optical observations
  69. GRB 050709: PROMPT Rc Observations
  70. GRB050713b: Maidanak optical observations
  71. GRB 050724: Secure Host Redshift from Keck
  72. GRB 050724: WHT optical observations
  73. GRB050726: Swift UVOT observations
  74. GRB 050724: Chandra Observations of the X-ray Afterglow
  75. GRB050724: Refined Radio Position
  76. GRB050713: analysis of the XMM-Newton observation
  77. GRB 050724, SMARTS optical/IR afterglow observations
  78. GRB 050726, SMARTS optical/IR observations
  79. Swift-BAT trigger 147918 is not a real GRB
  80. GRB050724: VLT observations of the variable source
  81. GRB050709: Second Epoch Chandra Observation
  82. GRB 050726: PROMPT Rc Observations
  83. GRB050709: Second Epoch Chandra Observation
  84. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  85. GRB050724: Further Radio Observations
  86. GRB 050726: early Swift XRT analysis results
  87. GRB050726: Swift-BAT detection of a weak burst
  88. GRB 050724: Optical Variability in Nearby Galaxy
  89. GRB 050724: J-band observations
  90. GRB 050724: GMOS Imaging and Spectroscopy
  91. GRB 050724: SWIFT XRT refined position
  92. RXTE ASM Detection of GRB050724
  93. GRB050724: Radio Observation
  94. GRB 050724: spectroscopy of object in the XRT error circle
  95. GRB 050724: Optical limit
  96. GRB 050724: optical and near-IR observations
  97. GRB 050724: Optical imaging/astrometry
  98. GRB 050724: RTT150 optical observations
  99. GRB 050724: Swift/UVOT Upper Limit
  100. GRB 050724: early Swift XRT analysis results

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