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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26764 results found.

  1. GRB021211, OT at 108 s
  2. HETE 2493: Optical observations
  3. HETE 2493: Optical candidate
  4. GRB 021204: Optical Observations at RIKEN
  5. GRB 021201: BOOTES simultaneous optical observations
  6. GRB 021112: RAPTOR Observations
  7. GRB021104: Optical Observations
  8. SGR1900+14 activity, November 2-4, 2002
  9. GRB021104: possible optical afterglow
  10. GRB 021016, optical observations
  11. GRB 021004: VRI observations at TNG: possible break
  12. GRB 021008, optical observations
  13. IPN triangulation of GRB021014 (large error box)
  14. GRB 021004: Additional V-band Polarimetric Observations
  15. GRB 021004: V-band Polarimetric Observations
  16. GRB 021004: Optical observations at RIKEN
  17. GRB 021004, SPM optical observations
  18. GRB021004: optical observations at Nyrola
  19. GRB021004: Optical Afterglow
  20. GRB 020903: Optical observations at RIKEN
  21. XRF 020903: Supernova
  22. IPN triangulation of GRB020914
  23. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  24. INTEGRAL GRBs added to GCN
  25. GRB020812: optical observation
  26. Second epoch K band imaging of GRB 020819
  27. K band observation of GRB 020819
  28. HETE 2275: Optical observations
  29. Polarimetry of GRB020813: evidence for variability
  30. GRB020812: optical observations
  31. GRB020813: Early Time Magnitude
  32. GRB020813, optical observations
  33. Early Time Limits for GRB020813
  34. GRB 020813 Afterglow Observations; Possible break
  35. GRB 020813 multiband optical observations
  36. GRB020813: optical afterglow
  37. GRB020813: Fading of Candidate OT
  38. GRB020813: Candidate Optical Afterglow
  39. GRB 020812 optical observation
  40. GRB020801, optical afterglow candidate
  41. GRB020625 (=H2081): A Long Burst Localized by HETE
  42. HETE #2081: Optical observations
  43. GRB 020531, simultaneous optical observations
  44. GRB020321 : Optical observations.
  45. GRB 020410, optical observations
  46. GRB 020331: Candidate Optical Afterglow
  47. GRB 020322: BeppoSAX observations of the X-ray afterglow
  48. SN 2002ap - peak brightness date (SN/GRB?)
  49. GRB020321: a faint BeppoSAX detection
  50. GRB020317, optical observations
  51. GRB020305, optical observations
  52. GRB020124, optical observations
  53. HETE 1896: Optical observations
  54. GRB011130 (=XRF011130), Optical Observations
  55. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  56. GRB 011030: K-band observations
  57. The X-ray Flash 011030 ('GRB 011030')
  58. GRB 011019 optical observation
  59. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  60. GRB 010921: The afterglow of HETE #1761
  61. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  62. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  63. GRB010921 Optical Observations
  64. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  65. HETE Trigger #1760 (GRB 010920B?): a new optical source
  66. HETE Trigger #1759 (GRB 010920?) optical observations
  67. BeppoSAX/GRBM detection of GRB 010801
  68. GCN and HETE status
  69. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  70. GRB 010629 Optical Observations
  71. IPN triangulation of GRB010613
  72. IPN triangulation of GRB010612
  73. GRB010518: a faint BeppoSAX detection
  74. GRB010324: BeppoSAX/GRBM data
  75. GRB 010214: X-Ray afterglow
  76. GRB010213, optical observations
  77. GRB010126: CONCAM crude optical limits during GRB
  78. HETE positions added to GCN
  79. CONCAM null result on GRB001005
  80. CONCAM crude optical limits before and after GRB000926
  81. GRB000607, optical observations
  82. GRB 000615: NIR observations
  83. IPN triangulation of GRB000519
  84. RXTE/ASM and IPN localization of GRB 000508B
  85. BeppoSAX GRB000424
  86. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  87. GRB000408, lotis optical observations
  88. GRB 000313 - optical transient in the BATSE error box
  89. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  90. BATSE GRB trigger criterion changed
  91. GRB000210 X-ray afterglow
  92. GRB 000210: BATSE Observations
  93. GRB000201 Optical Observations
  94. GRB 000201: TAROT optical observations
  95. BATSE GRB trigger criteria changed
  96. BATSE+IPN location of GRB000131
  97. BATSE location of GRB000126
  98. BATSE Observations of GRB000115
  99. Second RXTE Observation of GRB 000115
  100. Single IPN error box for GRB991229

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