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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"

38154 results found.

  1. GRB 050813: Photometry of object in XRT error circle
  2. GRB 050813: Swift XRT afterglow localization
  3. RBO GRB 050714A and GRB 050716 observations
  4. GRB 050813: Possible Short Swift-BAT GRB
  5. Swift-BAT trigger 150131 is not a GRB
  6. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  7. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  8. GRB050803: CrAO optical observations, no OT candidate
  9. GRB 050730: WSRT Radio Observations
  10. GRB 050803: PROMPT BVRcIc Observations
  11. GRB 050807: ROTSE-III Optical Limits
  12. GRB 050730, optical observation
  13. GRB050805b: CrAO optical limit
  14. GRB050805a : Null detection report
  15. GRB050730, optical observations
  16. GRB050803, optical observations
  17. Swift-BAT trigger 149118 is very likely not a GRB
  18. Retraction of Swift Trigger 149131 (GRB 050805B)
  19. GRB 050805b: OHP optical limits
  20. GRB 050805b: TAROT optical limits
  21. GRB050805b: MASTER optical observations
  22. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  23. GRB050805a: MASTER optical candidat
  24. Swift-BAT trigger 149118 is probably not a GRB
  25. GRB 050803: RTT150 optical observations
  26. GRB050803: CrAO optical observations, possible OT candidate
  27. GRB 050803: Keck Observations
  28. GRB 050803: Swift-BAT refined analysis
  29. GRB 050802.422: Fading of the afterglow and detection of the host
  30. GRB050803: MASTER further analys
  31. GRB 050803, optical observations
  32. GRB 050803: Magellan Observations
  33. GRB 050803: early Swift XRT analysis results
  34. GRB 050803: TAROT optical limits
  35. GRB050803: MASTER optical observations
  36. GRB050802: Tentative absorption redshift
  37. GCN GRB observation 050713A
  38. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  39. GRB 050802: Swift/UVOT optical and UV detections
  40. GRB050802: CrAO optical observations
  41. GRB050801: Unchanged decay slope
  42. GRB 050730: OHP optical observations
  43. GRB 050802: early Swift XRT analysis results
  44. GRB 050802: Swift/UVOT observations
  45. GRB 050802 : Lulin Optical follow-up observation
  46. GRB 050802: Swift-BAT refined analysis
  47. GRB050801: Optical photometry and decay index
  48. GRB 050802: XRT position
  49. GRB 050802: Swift Gamma-ray Burst
  50. GRB 050730: Preliminary Analysis of MIKE Spectrum
  51. GCN 050801: early Swift XRT analysis results
  52. GRB 050801: Swift-BAT refined analysis
  53. GRB 050801, SMARTS optical/IR afterglow observations
  54. GRB 050801, afterglow observations
  55. GRB 050730, corrected photometry and break?
  56. GRB 050801: ROTSE-III Early Afterglow Break
  57. GRB050801: Swift-BAT detection of a burst
  58. GRB 050801: ROTSE-III Detection of Possible Counterpart
  59. GRB 050730: XRT refined analysis
  60. Correction to GCN Circ 3476 on GRB050525A
  61. GRB 050730: early TAROT optical observations
  62. GRB 050726: PROMPT Rc Observations
  63. GRB 050730: RTT150 optical observations
  64. GRB 050730, spectra and optical photometry
  65. GRB050730: Refined BAT analysis of the Swift-BAT burst
  66. GRB 050730: Swift XRT afterglow observations
  67. GRB 050730 XMM-Newton observation
  68. GRB 050730: PROMPT VRcIc Observations
  69. GRB050730, afterglow observations
  70. GRB050730: confirmation of redshift
  71. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  72. GRB 050730, SMARTS optical/IR afterglow observations
  73. GRB 050730 : Planned XMM-Newton observation
  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. GRB 050724: Chandra Observations of the X-ray Afterglow
  83. GRB050713: analysis of the XMM-Newton observation
  84. GRB 050724, SMARTS optical/IR afterglow observations
  85. GRB 050726, SMARTS optical/IR observations
  86. Swift-BAT trigger 147918 is not a real GRB
  87. GRB 050727: RTT150 optical observations
  88. GRB050727: KAIT optical limit
  89. GRB050709: Second Epoch Chandra Observation
  90. GRB 050726: PROMPT Rc Observations
  91. GRB050709: Second Epoch Chandra Observation
  92. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  93. GRB 050726: early Swift XRT analysis results
  94. GRB 050724: Optical Variability in Nearby Galaxy
  95. GRB 050724: J-band observations
  96. GRB 050724: GMOS Imaging and Spectroscopy
  97. GRB 050724: SWIFT XRT refined position
  98. GRB 050724: spectroscopy of object in the XRT error circle
  99. GRB 050724: Optical limit
  100. GRB 050724: optical and near-IR observations

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