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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"

38163 results found.

  1. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  2. GRB 050814: Swift XRT Afterglow Localization
  3. GRB 050814: Swift detection of a burst
  4. GRB 050813: Magellan detection of a high redshift galaxy cluster
  5. GRB050813: RTT150 optical observations
  6. GRB 050813: I-band observations
  7. GRB050813, SDSS pre-burst observations
  8. GRB 050813: KAIT optical limit
  9. GRB 050813: Swift-BAT refined analysis
  10. GRB 050813: Photometry of object in XRT error circle
  11. GRB 050813: Swift XRT afterglow localization
  12. RBO GRB 050714A and GRB 050716 observations
  13. GRB 050813: Possible Short Swift-BAT GRB
  14. Swift-BAT trigger 150131 is not a GRB
  15. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  16. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  17. GRB050803: CrAO optical observations, no OT candidate
  18. GRB 050730: WSRT Radio Observations
  19. GRB 050803: PROMPT BVRcIc Observations
  20. GRB 050807: ROTSE-III Optical Limits
  21. GRB 050730, optical observation
  22. GRB050805b: CrAO optical limit
  23. GRB050805a : Null detection report
  24. GRB050730, optical observations
  25. GRB050803, optical observations
  26. Swift-BAT trigger 149118 is very likely not a GRB
  27. Retraction of Swift Trigger 149131 (GRB 050805B)
  28. GRB 050805b: OHP optical limits
  29. GRB 050805b: TAROT optical limits
  30. GRB050805b: MASTER optical observations
  31. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  32. GRB050805a: MASTER optical candidat
  33. Swift-BAT trigger 149118 is probably not a GRB
  34. GRB 050803: RTT150 optical observations
  35. GRB050803: CrAO optical observations, possible OT candidate
  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. GRB 050803: TAROT optical limits
  44. GRB050803: MASTER optical observations
  45. GRB050802: Tentative absorption redshift
  46. GCN GRB observation 050713A
  47. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  48. GRB 050802: Swift/UVOT optical and UV detections
  49. GRB050802: CrAO optical observations
  50. GRB050801: Unchanged decay slope
  51. GRB 050730: OHP optical observations
  52. GRB 050802: early Swift XRT analysis results
  53. GRB 050802: Swift/UVOT observations
  54. GRB 050802 : Lulin Optical follow-up observation
  55. GRB 050802: Swift-BAT refined analysis
  56. GRB050801: Optical photometry and decay index
  57. GRB 050802: XRT position
  58. GRB 050802: Swift Gamma-ray Burst
  59. GRB 050730: Preliminary Analysis of MIKE Spectrum
  60. GCN 050801: early Swift XRT analysis results
  61. GRB 050801: Swift-BAT refined analysis
  62. GRB 050801, SMARTS optical/IR afterglow observations
  63. GRB 050801, afterglow observations
  64. GRB 050730, corrected photometry and break?
  65. GRB 050801: ROTSE-III Early Afterglow Break
  66. GRB050801: Swift-BAT detection of a burst
  67. GRB 050801: ROTSE-III Detection of Possible Counterpart
  68. GRB 050730: XRT refined analysis
  69. Correction to GCN Circ 3476 on GRB050525A
  70. GRB 050730: early TAROT optical observations
  71. GRB 050726: PROMPT Rc Observations
  72. GRB 050730: RTT150 optical observations
  73. GRB 050730, spectra and optical photometry
  74. GRB050730: Refined BAT analysis of the Swift-BAT burst
  75. GRB 050730: Swift XRT afterglow observations
  76. GRB 050730 XMM-Newton observation
  77. GRB 050730: PROMPT VRcIc Observations
  78. GRB050730, afterglow observations
  79. GRB050730: confirmation of redshift
  80. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  81. GRB 050730, SMARTS optical/IR afterglow observations
  82. GRB 050730 : Planned XMM-Newton observation
  83. GRB050730: Liverpool Telescope optical observations
  84. GRB 050730, optical candidate
  85. GRB050730: Swift-BAT detection of a weak burst
  86. GRB 050713A: Swift XRT extended light curve
  87. GRB 050709: PROMPT Rc Observations
  88. GRB050713b: Maidanak optical observations
  89. GRB 050724: Secure Host Redshift from Keck
  90. GRB 050724: WHT optical observations
  91. GRB 050724: Chandra Observations of the X-ray Afterglow
  92. GRB050713: analysis of the XMM-Newton observation
  93. GRB 050724, SMARTS optical/IR afterglow observations
  94. GRB 050726, SMARTS optical/IR observations
  95. Swift-BAT trigger 147918 is not a real GRB
  96. GRB 050727: RTT150 optical observations
  97. GRB050727: KAIT optical limit
  98. GRB050709: Second Epoch Chandra Observation
  99. GRB 050726: PROMPT Rc Observations
  100. GRB050709: Second Epoch Chandra Observation

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