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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"

36197 results found.

  1. GRB050820: refined XRT analysis
  2. GRB 050820: Early RAPTOR detections
  3. GRB 050820 Swift-BAT refined analysis
  4. GRB 050820: P60 Temporal Decay Index
  5. GRB 050820: High Resolution Spectroscopy from Keck
  6. GRB050819: RTT150 optical observations
  7. GRB 050820: Swift detection of a GRB
  8. GRB 050819 Swift-BAT refined analysis
  9. GRB050819: Swift XRT position
  10. GRB050819: Swift-BAT detection of a weak burst
  11. Swift-BAT trigger 150993 is not a GRB
  12. Swift Trigger 150823 is HETE J1900.1-2455
  13. GRB 050817: Optical observations
  14. GRB 050815: Radio Observation
  15. GRB050814: Radio Observation
  16. GRB050817: Negative Optical Observations
  17. GRB 050814: continued fading
  18. GRB 050813: Radio Observations
  19. GRB050815: Refined analysis of the Swift-BAT burst
  20. GRB 050815: ROTSE-III Optical Limits
  21. GRB050815: Swift XRT afterglow localization
  22. GRB 050730: Third Epoch WSRT Radio Observations
  23. GRB050814: Fading red source
  24. GRB 050813: Gemini Spectra Revisited
  25. GRB 050813: Non-fading of afterglow candidate
  26. GRB 050814: XRT refined analysis
  27. GRB050814: Refined analysis of the Swift-BAT burst
  28. GRB050813: Gemini Imaging
  29. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  30. GRB 050814: Swift XRT Afterglow Localization
  31. GRB 050814: Swift detection of a burst
  32. GRB 050813: Magellan detection of a high redshift galaxy cluster
  33. GRB050813: RTT150 optical observations
  34. GRB 050813: I-band observations
  35. GRB050813, SDSS pre-burst observations
  36. GRB 050813: KAIT optical limit
  37. GRB 050813: Swift-BAT refined analysis
  38. GRB 050813: Photometry of object in XRT error circle
  39. GRB 050813: Swift XRT afterglow localization
  40. RBO GRB 050714A and GRB 050716 observations
  41. GRB 050813: Possible Short Swift-BAT GRB
  42. Swift-BAT trigger 150131 is not a GRB
  43. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  44. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  45. GRB050803: CrAO optical observations, no OT candidate
  46. GRB 050730: WSRT Radio Observations
  47. GRB 050803: PROMPT BVRcIc Observations
  48. GRB 050807: ROTSE-III Optical Limits
  49. GRB 050730, optical observation
  50. GRB050805b: CrAO optical limit
  51. GRB050805a : Null detection report
  52. GRB050730, optical observations
  53. GRB050803, optical observations
  54. Swift-BAT trigger 149118 is very likely not a GRB
  55. Retraction of Swift Trigger 149131 (GRB 050805B)
  56. GRB 050805b: OHP optical limits
  57. GRB 050805b: TAROT optical limits
  58. GRB050805b: MASTER optical observations
  59. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  60. GRB050805a: MASTER optical candidat
  61. Swift-BAT trigger 149118 is probably not a GRB
  62. GRB 050803: RTT150 optical observations
  63. GRB050803: CrAO optical observations, possible OT candidate
  64. GRB 050803: Keck Observations
  65. GRB 050803: Swift-BAT refined analysis
  66. GRB 050802.422: Fading of the afterglow and detection of the host
  67. GRB050803: MASTER further analys
  68. GRB 050803, optical observations
  69. GRB 050803: Magellan Observations
  70. GRB 050803: early Swift XRT analysis results
  71. GRB 050803: TAROT optical limits
  72. GRB050803: MASTER optical observations
  73. GRB050802: Tentative absorption redshift
  74. GCN GRB observation 050713A
  75. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  76. GRB 050802: Swift/UVOT optical and UV detections
  77. GRB050802: CrAO optical observations
  78. GRB050801: Unchanged decay slope
  79. GRB 050730: OHP optical observations
  80. GRB 050802: early Swift XRT analysis results
  81. GRB 050802: Swift/UVOT observations
  82. GRB 050802 : Lulin Optical follow-up observation
  83. GRB 050802: Swift-BAT refined analysis
  84. GRB050801: Optical photometry and decay index
  85. GRB 050802: XRT position
  86. GRB 050802: Swift Gamma-ray Burst
  87. GRB 050730: Preliminary Analysis of MIKE Spectrum
  88. GCN 050801: early Swift XRT analysis results
  89. GRB 050801: Swift-BAT refined analysis
  90. GRB 050801, SMARTS optical/IR afterglow observations
  91. GRB 050801, afterglow observations
  92. GRB 050730, corrected photometry and break?
  93. GRB 050801: ROTSE-III Early Afterglow Break
  94. GRB050801: Swift-BAT detection of a burst
  95. GRB 050801: ROTSE-III Detection of Possible Counterpart
  96. GRB 050730: XRT refined analysis
  97. Correction to GCN Circ 3476 on GRB050525A
  98. GRB 050730: early TAROT optical observations
  99. GRB 050726: PROMPT Rc Observations
  100. GRB 050730: RTT150 optical observations

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