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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"

22215 results found.

  1. GRB050813: RTT150 optical observations
  2. GRB 050813: I-band observations
  3. GRB050813, SDSS pre-burst observations
  4. RBO GRB 050714A and GRB 050716 observations
  5. GRB050813 (Swift 150139): P60 Observations
  6. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  7. GRB050803: CrAO optical observations, no OT candidate
  8. Detection of an intermediate burst from SGR 1806-20 on August 8
  9. GRB 050730: WSRT Radio Observations
  10. GRB 050803: PROMPT BVRcIc Observations
  11. GRB 050807: ROTSE-III Optical Limits
  12. GRB050805a : Null detection report
  13. GRB050730, optical observations
  14. GRB050803, optical observations
  15. Swift-BAT trigger 149118 is very likely not a GRB
  16. GRB050805b: MASTER optical observations
  17. GRB050805a: MASTER optical candidat
  18. GRB050802: TNG optical observations
  19. GRB050803: Radio Observation
  20. GRB 050803: RTT150 optical observations
  21. GRB050730: Radio Detection
  22. GRB050803: CrAO optical observations, possible OT candidate
  23. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  24. GRB 050803: Keck Observations
  25. GRB050803: MASTER further analys
  26. GRB 050803, optical observations
  27. GRB 050803: Magellan Observations
  28. GRB 050803: TAROT optical limits
  29. GRB050803: MASTER optical observations
  30. GRB050802: Tentative absorption redshift
  31. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  32. GRB 050802: Swift/UVOT optical and UV detections
  33. GRB050802: CrAO optical observations
  34. GRB 050730: OHP optical observations
  35. GRB 050802: Swift/UVOT observations
  36. GRB 050802: Swift Gamma-ray Burst
  37. GRB 050730: Preliminary Analysis of MIKE Spectrum
  38. GRB 050801, SMARTS optical/IR afterglow observations
  39. GRB 050801, afterglow observations
  40. GRB 050730, corrected photometry and break?
  41. GRB050801: Swift-BAT detection of a burst
  42. GRB 050801: ROTSE-III Detection of Possible Counterpart
  43. GRB 050730: XRT refined analysis
  44. GRB 050730: early TAROT optical observations
  45. GRB 050726: PROMPT Rc Observations
  46. GRB 050730: RTT150 optical observations
  47. GRB 050730: Swift XRT afterglow observations
  48. GRB 050730: PROMPT VRcIc Observations
  49. GRB050730, afterglow observations
  50. GRB050730: confirmation of redshift
  51. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  52. GRB 050730, SMARTS optical/IR afterglow observations
  53. GRB050730: Liverpool Telescope optical observations
  54. GRB050730: Swift-BAT detection of a weak burst
  55. GRB 050709: PROMPT Rc Observations
  56. GRB050713b: Maidanak optical observations
  57. GRB 050724: WHT optical observations
  58. GRB050726: Swift UVOT observations
  59. GRB 050724: Chandra Observations of the X-ray Afterglow
  60. GRB050724: Refined Radio Position
  61. GRB 050724, SMARTS optical/IR afterglow observations
  62. GRB 050726, SMARTS optical/IR observations
  63. GRB 050727: RTT150 optical observations
  64. GRB050724: VLT observations of the variable source
  65. GRB 050726: PROMPT Rc Observations
  66. GRB050724: Further Radio Observations
  67. GRB 050726: early Swift XRT analysis results
  68. GRB050726: Swift-BAT detection of a weak burst
  69. GRB 050724: Optical Variability in Nearby Galaxy
  70. GRB 050724: J-band observations
  71. GRB 050724: GMOS Imaging and Spectroscopy
  72. GRB050724: Radio Observation
  73. GRB 050724: spectroscopy of object in the XRT error circle
  74. GRB 050724: optical and near-IR observations
  75. GRB 050724: Optical imaging/astrometry
  76. GRB 050724: RTT150 optical observations
  77. GRB 050724 : Lulin early R-band monitoring observations
  78. GRB 050721: early afterglow light curve
  79. GRB 050721: optical afterglow confirmed
  80. GRB 050721a: Optical Observations
  81. GRB 050717: PROMPT RcIc Observations
  82. GRB050712: Radio Observations
  83. GRB 050712, Tautenburg optical afterglow observations
  84. Swift-BAT detection of a possible GRB
  85. GRB 050714B: VLT R-band observations
  86. GRB 050717: Additional LCO observations
  87. GRB 050716; J-band observations
  88. GRB 050717: LCO near-IR observations
  89. Swift/UVOT Observations of GRB 050717
  90. GRB 050717: Refined XRT analysis.
  91. Swift detection of GRB 050717
  92. GRB 050716 - UKIRT identification of candidate afterglow
  93. Swift UVOT Observations of GRB 050716
  94. GRB 050716: Refined XRT analysis.
  95. GRB 050716: Lulin B and R band optical observations
  96. GRB 050716: Optical Observations
  97. GRB050716: Faulkes North Telescope observation
  98. Swift/BAT detection of GRB 050716
  99. Swift UVOT Observations of GRB 050714B
  100. GRB 050714B: refined XRT analysis

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