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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"

28201 results found.

  1. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  2. GRB041223: Swift-BAT detection of a bright long burst
  3. GRB 041218: optical observations
  4. GRB 041219: WSRT Radio Afterglow Detection
  5. GRB 041218: Optical observations
  6. GRB 041219 : optical follow-up observations
  7. GRB 041219 Optical Observations
  8. GRB041219: Optical Afterglow Detection
  9. GRB041219: Continued NIR Observations
  10. GRB041219b: A Swift-BAT burst
  11. GRB 041219: Radio Afterglow Detection
  12. GRB 041218 : Radio Observations
  13. GRB 041218: R-band optical observations
  14. GRB041218: Liverpool Telescope optical observations
  15. GRB041218: optical observations
  16. GRB041219: Confirmed NIR Afterglow
  17. GRB041218: Continued P60 Optical Observations
  18. Swift-BAT detection of the bright long burst GRB041219
  19. GRB 041219: Infrared Afterglow Candidate
  20. GRB 041219: Infrared Afterglow Candidate
  21. GRB041218, BVRcIc field calibration
  22. GRB041218: optical observations
  23. GRB 041218: Optical observations
  24. GRB 041217: LCO40 Optical Observations and Possible Candidates
  25. GRB041217: Infrared Observations
  26. Optical transient (GRB?) in Lynx
  27. GRB041211, BVRcIc field calibration
  28. GRB041211: P60 optical imaging
  29. GRB970815: Discovery of Optical Afterglow
  30. Distribution of IBAS Alerts for NON-GRB sources
  31. GRB 040924: Afterglow Color
  32. GRB 041006: GETS Optical Afterglow Observation
  33. GRB 041006: Optical Observations
  34. GRB041006, late-time optical photometry
  35. GRB041006: RTT150 Optical Observations
  36. HST Observations: XRF 040701 and 040812
  37. GRB041006: RTT150 Optical Observations
  38. GRB 041016: Optical limits
  39. GRB041006: Near Infrared observations
  40. GRB040924, BVRcIc field calibration
  41. GRB041006: Fading X-ray Afterglow Observed with Chandra
  42. GRB041006: VLT observations of the afterglow and host galaxy
  43. GRB041006: Optical observations and Potential host galaxy
  44. GRB041006, BVRcIc field calibration
  45. GRB 041006: SARA afterglow observations
  46. Search for SN light in XRF 040912 with MEGACAM
  47. GRB 040916: Afterglow Color at Early Times
  48. GRB 041006 Optical afterglow observations
  49. GRB 041006: BR observations with VATT
  50. GRB 041006: Redshift confirmed
  51. GRB041006: Liverpool Telescope optical observations
  52. GRB 041006: Colour measurement
  53. GRB041006: break in the light curve
  54. GRB 041006: Radio Observations
  55. GRB041006, further submilllimetre observations
  56. GRB 041006 : optical follow-up observation at Lulin Observatory
  57. GRB 041006 : Optical follow-up observation at TAROT
  58. GRB041006: Optical photometry and spectroscopy at TNG
  59. GRB041006 (= H3570): Chandra Observations In Progress
  60. GRB 041006 : optical observation at Bisei
  61. GRB041006, optical I observation
  62. GRB041006, submillimetre observations
  63. GRB 041006: Optical decay
  64. GRB041006: Fading of optical afterglow candidate
  65. GRB 041006: Finding chart
  66. GRB 041006: Optical afterglow candidate
  67. GRB 040924: Second Epoch WSRT Radio Observations
  68. radio observations, GRB 040924
  69. GRB040924,optical observation
  70. GRB040924, RTT150 optical observation
  71. GRB 040924: detection of possible host galaxy by Subaru
  72. GRB040924, RTT150 optical observation
  73. GRB040924: Afterglow magnitude at t=17.5hr
  74. GRB 040924: WSRT Radio Observations
  75. GRB 040924: Subaru NIR observation
  76. GRB040924: Optical afterglow properties
  77. GRB 040924, optical follow-up
  78. GRB040924 (H3564): Optical afterglow candidate
  79. XRF 040912: Radio Observations
  80. XRF 040916: Radio Observations
  81. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  82. TAROT Observations of GRB 040916 (HETE #3558)
  83. GRB040912(=H3557): Candidate Optical Afterglow
  84. XRF040912, BVRcIc field calibration
  85. XRF040916, BVRcIc field calibration
  86. GRB040916: Archival optical observations
  87. GRB 040912: Optical Observations
  88. GRB 040912, BVRI observations
  89. HETE 3557: Optical observations
  90. GRB040827: analysis of the XMM-Newton observation
  91. GRB040903, REM near-IR observation
  92. GRB 040827 - Radio Observations
  93. XMM-Newton Images of GRB 040827
  94. GRB040825A: Optical observations
  95. GRB040825A: Optical observations
  96. GRB 040827: optical and NIR observations at the VLT
  97. GRB 040827: UKIRT - 2nd epoch K-band imaging
  98. GRB 040827: 2nd epoch of Magellan K-band imaging
  99. GRB 040827: Detection of NIR afterglow
  100. GRB 040827: Possible detection of optical afterglow

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