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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"

39402 results found.

  1. GRB050824, I-band imaging
  2. GRB050824: Radio Observations
  3. GRB 050824: Spectroscopic redshift from the VLT
  4. GRB 050822: refined XRT analysis
  5. GRB 050824: XRT refined analysis and possible afterglow detection
  6. GRB 050824: BAT refined analysis of a soft weak burst
  7. GRB050824: MASTER:OT decay
  8. GRB050824: MASTER observation OT
  9. GRB050805a: MASTER optical candidat
  10. GRB 050824: ROTSE-III Optical Limits
  11. GRB050824: Swift-BAT detection of a burst
  12. GRB 050824 optical candidate
  13. GRB050820A: RTT150 optical observations
  14. GRB050820a: PROMPT RcIc Observations
  15. GRB050815: Maidanak optical observation
  16. XRF050509c: Radio upper limits from GMRT
  17. VLT/UVES spectroscopy of GRB050820
  18. GRB 050820A BAT observations of second, larger episode of emission
  19. GRB050813: Maidanak I-band observations
  20. GRB 050822: Swift-BAT refined analysis
  21. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  22. GRB050820B at FRAM
  23. GRB050820A: RTT150 optical observations
  24. GRB 050820a - corrections to GCN 3846
  25. Swift/UVOT UV Photometry of GRB 050820B
  26. GRB 050822: ROTSE-III Prompt Optical Limits
  27. GRB 050822: Swift detection of a long burst
  28. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  29. GRB050820A: Radio Observation
  30. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  31. GRB050820a BVRcIc field photometry
  32. GRB 050820a: NIR Observations by WIRO
  33. GRB 050820B: Swift XRT position
  34. GRB050820B: Refined analysis of the Swift-BAT burst
  35. GRB050820B: BAT-Swift detection of a bright GRB
  36. GRB050820: refined XRT analysis
  37. GRB 050820: Early RAPTOR detections
  38. GRB 050820 Swift-BAT refined analysis
  39. GRB 050820: P60 Temporal Decay Index
  40. GRB 050820: High Resolution Spectroscopy from Keck
  41. GRB050819: RTT150 optical observations
  42. GRB 050820: Swift detection of a GRB
  43. GRB 050819 Swift-BAT refined analysis
  44. GRB050819: Swift XRT position
  45. GRB050819: Swift-BAT detection of a weak burst
  46. Swift-BAT trigger 150993 is not a GRB
  47. Swift Trigger 150823 is HETE J1900.1-2455
  48. GRB 050817: Optical observations
  49. GRB 050815: Radio Observation
  50. GRB050814: Radio Observation
  51. GRB050817: Negative Optical Observations
  52. GRB050817: Swift-BAT Detection of a burst
  53. GRB 050814: continued fading
  54. GRB 050813: Radio Observations
  55. GRB050815: Refined analysis of the Swift-BAT burst
  56. GRB 050815: ROTSE-III Optical Limits
  57. GRB050815: Swift XRT afterglow localization
  58. GRB050815: Swift-BAT detection of a burst
  59. GRB 050730: Third Epoch WSRT Radio Observations
  60. GRB050814: Fading red source
  61. GRB 050813: Gemini Spectra Revisited
  62. GRB050814: P60 Optical Afterglow Candidate
  63. GRB 050813: Non-fading of afterglow candidate
  64. GRB 050814: XRT refined analysis
  65. GRB050814: Refined analysis of the Swift-BAT burst
  66. GRB050813: Gemini Imaging
  67. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  68. GRB 050814: Swift XRT Afterglow Localization
  69. GRB 050814: Swift detection of a burst
  70. GRB 050813: Magellan detection of a high redshift galaxy cluster
  71. GRB050813: RTT150 optical observations
  72. GRB 050813: I-band observations
  73. GRB050813, SDSS pre-burst observations
  74. GRB 050813: KAIT optical limit
  75. GRB 050813: Swift-BAT refined analysis
  76. GRB 050813: Photometry of object in XRT error circle
  77. GRB 050813: Swift XRT afterglow localization
  78. RBO GRB 050714A and GRB 050716 observations
  79. GRB 050813: Possible Short Swift-BAT GRB
  80. Swift-BAT trigger 150131 is not a GRB
  81. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  82. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  83. GRB050803: CrAO optical observations, no OT candidate
  84. GRB 050730: WSRT Radio Observations
  85. GRB 050803: PROMPT BVRcIc Observations
  86. GRB 050807: ROTSE-III Optical Limits
  87. GRB 050730, optical observation
  88. GRB050805b: CrAO optical limit
  89. GRB050805a : Null detection report
  90. GRB050730, optical observations
  91. GRB050803, optical observations
  92. Swift-BAT trigger 149118 is very likely not a GRB
  93. Retraction of Swift Trigger 149131 (GRB 050805B)
  94. GRB 050805b: OHP optical limits
  95. GRB 050805b: TAROT optical limits
  96. GRB050805b: MASTER optical observations
  97. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  98. GRB050805a: MASTER optical candidat
  99. Swift-BAT trigger 149118 is probably not a GRB
  100. GRB 050803: RTT150 optical observations

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