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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27402 results found.

  1. GRB010921 Optical Observations
  2. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  3. HETE Trigger #1760 (GRB 010920B?): a new optical source
  4. HETE Trigger #1759 (GRB 010920?) optical observations
  5. BeppoSAX/GRBM detection of GRB 010801
  6. GCN and HETE status
  7. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  8. GRB 010629 Optical Observations
  9. IPN triangulation of GRB010613
  10. IPN triangulation of GRB010612
  11. GRB010518: a faint BeppoSAX detection
  12. GRB010324: BeppoSAX/GRBM data
  13. GRB 010214: X-Ray afterglow
  14. GRB010213, optical observations
  15. GRB010126: CONCAM crude optical limits during GRB
  16. HETE positions added to GCN
  17. CONCAM null result on GRB001005
  18. CONCAM crude optical limits before and after GRB000926
  19. GRB000607, optical observations
  20. GRB 000615: NIR observations
  21. IPN triangulation of GRB000519
  22. RXTE/ASM and IPN localization of GRB 000508B
  23. BeppoSAX GRB000424
  24. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  25. GRB000408, lotis optical observations
  26. GRB 000313 - optical transient in the BATSE error box
  27. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  28. BATSE GRB trigger criterion changed
  29. GRB000210 X-ray afterglow
  30. GRB 000210: BATSE Observations
  31. GRB000201 Optical Observations
  32. GRB 000201: TAROT optical observations
  33. BATSE GRB trigger criteria changed
  34. BATSE+IPN location of GRB000131
  35. BATSE location of GRB000126
  36. BATSE Observations of GRB000115
  37. Second RXTE Observation of GRB 000115
  38. Single IPN error box for GRB991229
  39. GRB 991216: Updated BATSE parameters
  40. GRB 991216--Summary of RXTE Observations
  41. GRB 991216: Extremely bright BATSE burst
  42. GRB991106: BeppoSAX/BATSE results
  43. BeppoSAX NFI Observation of GRB991106
  44. GRB 991105: BATSE Observations
  45. GRB991106, optical observation at SAO-RAS
  46. GRB 991106, LOTIS Optical Observations
  47. GRB991105: SAX-GRBM/-WFC detection
  48. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  49. GRB ALERT: GRB991105
  50. GRB 991014 - BeppoSAX NFI observations
  51. GRB991014 BATSE Observations
  52. Super-LOTIS optical observation of GRB991014
  53. BeppoSAX ALERT: GRB991014
  54. GRB 990915 optical observations
  55. BATSE GRB trigger criteria
  56. IPN error box for GRB990915 (=BATSE 7766)
  57. IPN localization of BATSE #7766 (GRB990915)
  58. GRB990806: BATSE Observations
  59. BeppoSAX ALERT GRB990806: Summer GRB
  60. BeppoSAX NFI Observation of GRB990705
  61. BeppoSAX NFI Observation of GRB990705
  62. GRB990704
  63. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  64. BeppoSAX: GRB990625
  65. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  66. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  67. BeppoSAX: A new fast X-ray transient
  68. GRB990510: X-ray afterglow
  69. GRB 990510: BATSE Observations
  70. GRB 990506: BATSE Observations
  71. GRB990323 PRECISE IPN POSITION
  72. GRB990316: simultaneous optical observation
  73. GRB990316 - Optical null results
  74. ASM/IPN error box for GRB 990308 (BATSE #7457)
  75. GRB 990308a and GRB 990308b
  76. BATSE Resumes Normal Operations
  77. Search for Potential Images of GRB 990123
  78. Search for Potential Images of GRB 990123
  79. GRB990123, OSSE observations
  80. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  81. GRB 990123: BATSE Observations
  82. GRB990123, early optical counterpart detection
  83. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  84. Possible identification of SN1999E with GRB980910
  85. GRB 980923 BATSE Observations
  86. GRB980703 - BeppoSAX/GRBM detection
  87. GRB 980703: BATSE Observations
  88. RXTE Observation of GRB 980706
  89. GRB980703: LOTIS observation at early times
  90. GRB 980703: ASM Position & Intensity
  91. GRB 980613: BATSE Observations
  92. SGR1627-41, BeppoSAX-GRBM detections
  93. Discovery of a new SGR source, SGR1627-41
  94. BATSE on-board GRB trigger change
  95. GRB980519 BATSE Observations
  96. BATSE on-board GRB trigger change
  97. GRB980519, BeppoSAX-WFC updated position
  98. GRB980519, BeppoSAX-WFC position
  99. GRB980425 BATSE observations
  100. GRB 971024: Refined analysis by USNOFS Observations

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