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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"

16197 results found.

  1. GRB 050117: Optical observation
  2. GRB050117: MASTER optical observations
  3. MASTER:GRB050117 SWIFT
  4. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  5. SGR 1806-20 and extragalactic short-duration GRBs
  6. GRB 041217: Optical observations
  7. GRB041219, early time observations
  8. GRB041228: ROTSE-III Optical Observations
  9. GRB041226: ROTSE-III Optical Observations
  10. GRB041223: decay of the afterglow
  11. GRB041224: ROTSE-III Optical Observations
  12. GRB 041224: near-infrared observations with REM
  13. GRB 041223: XRT afterglow spectrum and light curve
  14. GRB041223: optical and NIR observations with REM
  15. Swift-BAT Time History of GRB041219
  16. GRB 041219: TAROT optical observations
  17. GRB 041218: TAROT optical observations
  18. GRB 041223: Detection of Optical Transient with LCO40
  19. GRB041223: ROTSE-III Optical Observations
  20. GRB 041218: optical observations
  21. GRB 041218: Optical observations
  22. GRB 041219 : optical follow-up observations
  23. Deep RAPTOR observations during GRB 041219
  24. GRB 041218 Optical Observations
  25. GRB 041219 Optical Observations
  26. GRB041219: Optical Afterglow Detection
  27. GRB041219: Continued NIR Observations
  28. GRB 041219 ,optical observation
  29. GRB 041219: Radio Afterglow Detection
  30. GRB 041218 : Radio Observations
  31. GRB 041218: R-band optical observations
  32. GRB041218: Liverpool Telescope optical observations
  33. GRB041218: optical observations
  34. GRB041218: Continued P60 Optical Observations
  35. GRB 041218: Optical Observation
  36. GRB 041219: Infrared Afterglow Candidate
  37. GRB 041219: Infrared Afterglow Candidate
  38. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  39. GRB041219: P60 Optical Observations
  40. GRB041218: optical observations
  41. GRB041217: optical limit 30 min after GRB
  42. GRB 041218; optical candidate
  43. GRB 041218: Optical observations
  44. GRB 041217: LCO40 Optical Observations and Possible Candidates
  45. GRB041217: Optical Observations
  46. GRB041217: NIR and optical observations with REM
  47. GRB041217: P60 Optical Observations
  48. GRB041211: Faulkes Telescope continued optical monitoring
  49. Optical Transient in Lynx not a GRB
  50. Optical transient (GRB?) in Lynx
  51. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  52. GRB041211: Continued P60 Observations
  53. GRB041211: RAPTOR observations
  54. GRB041211: Ashra Prototype optical observation
  55. GRB041211, Faulkes Telescope optical observation
  56. GRB041211,optical observation
  57. GRB 041211: Optical follow-up in East Asian region
  58. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  59. GRB041211: P60 optical imaging
  60. GRB970815: Discovery of Optical Afterglow
  61. GRB 041006: GETS Optical Afterglow Observation
  62. GRB 041006: Optical Observations
  63. GRB041006, late-time optical photometry
  64. GRB041015, optical observation in CrAO
  65. GRB041006: RTT150 Optical Observations
  66. GRB041015 : Multi epoch optical observations
  67. GRB 041016: BOOTES-2 simultaneous observation
  68. GRB041006: RTT150 Optical Observations
  69. GRB041016,optical observation
  70. GRB 041016: Optical limits
  71. GRB 041016: Optical limits in V, R, I
  72. GRB 041016:Optical limit during first minute
  73. GRB041016: MASTER: Optical observations
  74. GRB 041015: Optical Observations at Rikubetsu
  75. GRB041006: Near Infrared observations
  76. GRB 041016: Optical limit
  77. GRB041015: MASTER: Optical observations
  78. GRB041015,optical observation
  79. GRB041006: Fading X-ray Afterglow Observed with Chandra
  80. GRB 041015: Optical limit at Osaka University
  81. GRB041015 : Optical follow-up at Kiso
  82. GRB041006: VLT observations of the afterglow and host galaxy
  83. GRB041006: Optical observations and Potential host galaxy
  84. GRB 041006: SARA afterglow observations
  85. GRB041006, optical observation in CrAO
  86. GRB 040916: Afterglow Color at Early Times
  87. GRB 041006 Optical afterglow observations
  88. GRB 041006: BR observations with VATT
  89. GRB 041006: Redshift confirmed
  90. GRB041006: Liverpool Telescope optical observations
  91. GRB041006: break in the light curve
  92. GRB 041006: Radio Observations
  93. GRB 041006 : optical follow-up observation at Lulin Observatory
  94. GRB 041006 : Optical follow-up observation at TAROT
  95. GRB041006: Optical photometry and spectroscopy at TNG
  96. GRB 041006 : optical observation at Bisei
  97. GRB041006, optical I observation
  98. GRB041006 (=HETE3570): optical observations
  99. ROTSE-IIIa Observations of GRB 041006
  100. GRB041006, optical observation

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