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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"

45681 results found.

  1. GRB060203: Observations with SARA
  2. GRB 060203: P60 Confirmation of Optical Afterglow
  3. Possible GRB 060203: candidate optical counterpart
  4. Swift BAT Trigger 180151: Swift XRT source detection
  5. Possible GRB 060203: optical observations at Asiago
  6. GRB 060202: PROMPT Observations
  7. Swift-BAT trigger 180151 is unknown origin at this time
  8. GRB 060202: GETS observation
  9. GRB 060202: Gemini-N J, H, K_s observations
  10. GRB 060202 : Kiso B and R band limit
  11. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  12. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  13. GRB 060202: Refined analysis of the Swift-BAT burst
  14. GRB060202, optical observation
  15. GRB 060202: Swift/UVOT upper limits
  16. GRB 060202: Swift XRT Team Refined Analysis
  17. GRB 060202 : Lulin R and I band limit
  18. GRB060202: Faulkes North observation
  19. GRB 060202: Swift detection of a burst
  20. GRB 060121: Gemini Late-time Observations
  21. Erratum: SDSS pre-burst observations of GRB fields
  22. GRB 060130: PROMPT Observations
  23. GRB060130: Further R-band imaging
  24. GRB 060130: Swift/XRT observation
  25. GRB 051211A: MDM Observations
  26. GRB 060123: Gemini spectroscopy of the putative host galaxy
  27. GRB 060123: VLA Radio Observations
  28. GRB060130: Optical imaging
  29. GRB060130: REM infrared observations
  30. GRB 060130, SMARTS optical observations
  31. GRB 060130: FRAM optical observations
  32. GRB 060130: further INTEGRAL IBIS results
  33. GRB 060130: a long GRB detected with INTEGRAL
  34. Possible GRB 051221B: MDM Correction
  35. GRB050121: optical observation
  36. GRB050121b: optical observation
  37. GRB 060121: Confirmation of NIR Afterglow
  38. GRB060124: optical observation
  39. GRB060124: optical observations
  40. GRB 060123: Swift refined analysis of an unusual GRB
  41. GRB060124, BVRcIc field calibration
  42. GRB060105: refined analysis of the Suzaku observation
  43. GRB060124 optical observations
  44. GRB 060121: Probable Detection of NIR Afterglow
  45. GRB060124: optical observation
  46. GRB 060116 HST observations
  47. GRB 060124: HETE detection and spectrum of the main peak
  48. Refined XRT Position for GRB 060123
  49. Konus-Wind observation of GRB 060124
  50. GRB060124: detailed XRT analysis
  51. GRB 060124 Optical Observations
  52. GRB 060124: ART optical limits during the burst
  53. GRB060123: Optical and IR Imaging
  54. GRB 060123: P200 Observations
  55. GRB 060124: Keck optical spectrum
  56. GRB 060124: Keck Absorption Redshift
  57. GRB 060124: MDM Optical Spectrum
  58. GRB 060124: XRT refined analysis
  59. GRB 060124: R band Observations
  60. GRB 060124 : Optical observation at Xinglong and Kiso
  61. GRB060124: optical observations at Asiago
  62. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  63. GRB060123: SDSS pre-burst observations
  64. GRB 060123: Swift detection of a very long, faint burst
  65. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  66. GRB 060121: OHP optical limits
  67. GRB 060124: TAROT optical limits
  68. GRB 060124: Swift/UVOT Observation
  69. GRB 060124: Confirmation of the Afterglow
  70. GRB 060124: XRT position
  71. GRB 060124: Optical Afterglow Candidate from Tautenburg
  72. GRB060124, optical observation
  73. GRB 050124 : Kiso Optical limit
  74. GRB 060124: Optical Observations at Tautenburg
  75. GRB 060117: Suzaku WAM observation of the prompt emission
  76. GRB 060111B: Suzaku WAM observation of the prompt emission
  77. GRB 060124: Swift-BAT detection of a burst
  78. GRB 060116: Radio Detection
  79. GRB 060116: MARGE optical observations
  80. GRB 060121: Swift/UVOT upper limits
  81. GRB 060121: Liverpool Telescopes optical limits
  82. GRB 060121: Swift XRT refined analysis
  83. Konus-Wind observation of GRB 060121
  84. GRB 060121: I-band Limits
  85. GRB 060121: Confirmation of Afterglow
  86. GRB 060121: candidate optical counterpart
  87. GRB 060121: Swift XRT refined position
  88. GRB060121: SARA Observations
  89. GRB 060121: optical observations
  90. GRB 060121: Infrared Observations
  91. GRB 060121: optical observations
  92. GRB 060121: Optical imaging
  93. GRB060121 - SDSS pre-burst observations
  94. GRB 060121: A short-hard GRB in a cluster?
  95. GRB 060121 (=H4010): Results of preliminary spectral analysis
  96. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  97. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  98. HETE Alert 4006: MASTER promt optical limit
  99. GRB 060117: PROMPT Observations
  100. GRB060117 - ATCA 3/6cm radio limits - correction

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