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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"

16203 results found.

  1. GRB050123,optical observation
  2. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  3. CFHTLS optical transient unlikely to be a GRB
  4. Unusual optical transient (GRB ???)
  5. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  6. GRB050117: optical observation
  7. GRB 050117: Optical observation
  8. GRB050117: MASTER optical observations
  9. MASTER:GRB050117 SWIFT
  10. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  11. SGR 1806-20 and extragalactic short-duration GRBs
  12. GRB 041217: Optical observations
  13. GRB041219, early time observations
  14. GRB041228: ROTSE-III Optical Observations
  15. GRB041226: ROTSE-III Optical Observations
  16. GRB041223: decay of the afterglow
  17. GRB041224: ROTSE-III Optical Observations
  18. GRB 041224: near-infrared observations with REM
  19. GRB 041223: XRT afterglow spectrum and light curve
  20. GRB041223: optical and NIR observations with REM
  21. Swift-BAT Time History of GRB041219
  22. GRB 041219: TAROT optical observations
  23. GRB 041218: TAROT optical observations
  24. GRB 041223: Detection of Optical Transient with LCO40
  25. GRB041223: ROTSE-III Optical Observations
  26. GRB 041218: optical observations
  27. GRB 041218: Optical observations
  28. GRB 041219 : optical follow-up observations
  29. Deep RAPTOR observations during GRB 041219
  30. GRB 041218 Optical Observations
  31. GRB 041219 Optical Observations
  32. GRB041219: Optical Afterglow Detection
  33. GRB041219: Continued NIR Observations
  34. GRB 041219 ,optical observation
  35. GRB 041219: Radio Afterglow Detection
  36. GRB 041218 : Radio Observations
  37. GRB 041218: R-band optical observations
  38. GRB041218: Liverpool Telescope optical observations
  39. GRB041218: optical observations
  40. GRB041218: Continued P60 Optical Observations
  41. GRB 041218: Optical Observation
  42. GRB 041219: Infrared Afterglow Candidate
  43. GRB 041219: Infrared Afterglow Candidate
  44. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  45. GRB041219: P60 Optical Observations
  46. GRB041218: optical observations
  47. GRB041217: optical limit 30 min after GRB
  48. GRB 041218; optical candidate
  49. GRB 041218: Optical observations
  50. GRB 041217: LCO40 Optical Observations and Possible Candidates
  51. GRB041217: Optical Observations
  52. GRB041217: NIR and optical observations with REM
  53. GRB041217: P60 Optical Observations
  54. GRB041211: Faulkes Telescope continued optical monitoring
  55. Optical Transient in Lynx not a GRB
  56. Optical transient (GRB?) in Lynx
  57. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  58. GRB041211: Continued P60 Observations
  59. GRB041211: RAPTOR observations
  60. GRB041211: Ashra Prototype optical observation
  61. GRB041211, Faulkes Telescope optical observation
  62. GRB041211,optical observation
  63. GRB 041211: Optical follow-up in East Asian region
  64. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  65. GRB041211: P60 optical imaging
  66. GRB970815: Discovery of Optical Afterglow
  67. GRB 041006: GETS Optical Afterglow Observation
  68. GRB 041006: Optical Observations
  69. GRB041006, late-time optical photometry
  70. GRB041015, optical observation in CrAO
  71. GRB041006: RTT150 Optical Observations
  72. GRB041015 : Multi epoch optical observations
  73. GRB 041016: BOOTES-2 simultaneous observation
  74. GRB041006: RTT150 Optical Observations
  75. GRB041016,optical observation
  76. GRB 041016: Optical limits
  77. GRB 041016: Optical limits in V, R, I
  78. GRB 041016:Optical limit during first minute
  79. GRB041016: MASTER: Optical observations
  80. GRB 041015: Optical Observations at Rikubetsu
  81. GRB041006: Near Infrared observations
  82. GRB 041016: Optical limit
  83. GRB041015: MASTER: Optical observations
  84. GRB041015,optical observation
  85. GRB041006: Fading X-ray Afterglow Observed with Chandra
  86. GRB 041015: Optical limit at Osaka University
  87. GRB041015 : Optical follow-up at Kiso
  88. GRB041006: VLT observations of the afterglow and host galaxy
  89. GRB041006: Optical observations and Potential host galaxy
  90. GRB 041006: SARA afterglow observations
  91. GRB041006, optical observation in CrAO
  92. GRB 040916: Afterglow Color at Early Times
  93. GRB 041006 Optical afterglow observations
  94. GRB 041006: BR observations with VATT
  95. GRB 041006: Redshift confirmed
  96. GRB041006: Liverpool Telescope optical observations
  97. GRB041006: break in the light curve
  98. GRB 041006: Radio Observations
  99. GRB 041006 : optical follow-up observation at Lulin Observatory
  100. GRB 041006 : Optical follow-up observation at TAROT

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