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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"

35428 results found.

  1. Possible precursor to the SGR1900+14 giant burst
  2. IPN Triangulation of the Giant Flare from SGR1900+14
  3. GRB010412, field photometry
  4. GRB 010326b Optical Observations
  5. GRB010412: Optical observations
  6. GRB010412: Optical observations
  7. IPN Triangulation of GRB010412
  8. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  9. BeppoSAX GRB ALERT: GRB010412
  10. GRB Observation Report
  11. GRB010324, revised field photometry
  12. REVISED LOCATION OF GRB010326A
  13. GRB 980326: Late-time HST/STIS observations
  14. GRB010324, field photometry
  15. GRB010326B, field photometry
  16. GRB010326, field photometry
  17. GRB010220, field photometry
  18. Further Optical Observations of GRB 010324
  19. GRB 010326A: Further optical observations
  20. GRB010324: BeppoSAX/GRBM data
  21. GRB 010326B: Optical observations
  22. GRB010324, optical observations
  23. GRB010326B: Localization by HETE (2nd GRB for this date)
  24. GRB 010326: Optical observations
  25. GRB 010326 optical observations
  26. GRB010326: Refined Localization by HETE
  27. GRB010326: Localization by HETE
  28. Duration, ECT, peak flux and fluence of GRB010324
  29. Optical Observations of GRB 010324
  30. IPN TRIANGULATION OF GRB010324
  31. GRB990705, VLT-FORS1 observations of the host galaxy
  32. GRB010222, late-time optical observation
  33. Support extension to the BeppoSAX mission
  34. GRB 010222 - HEGRA GeV/TeV Observations
  35. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  36. GRB010222: Chandra X-ray Observatory Observation
  37. GRB010222: Sub-millimeter vanishing act
  38. GRB 010222, Optical Observations
  39. GRB 010222: High-Resolution Keck Spectroscopy
  40. GRB 010214, I-band data
  41. Sub-millimeter Excess/GRB 010222
  42. GRB 010222
  43. GRB 010222 HST/Chandra TOO
  44. GRB 010222
  45. GRB010222 further R-band photometry
  46. GRB010222: R-band data
  47. GRB010222 Optical observations
  48. GRB 010222: Keck Spectroscopy
  49. GRB010214, field photometry
  50. GRB010222, field photometry
  51. GRB010222 further R-band photometry
  52. GRB010222, possible increase of optical decay slope
  53. GRB 010222 Kyoto optical observation
  54. GRB010222: fading behavior
  55. GRB 010222 BV optical observations
  56. GRB 010220: Near-IR Observations
  57. GRB010214 follow-up from Hanle
  58. GRB 010222: Near-IR Observations
  59. GRB 010222: Optical Observations
  60. GRB 010222, Decay Slope Confirmed
  61. GRB010222: Another absorption line system
  62. GRB010222: Optical decay slope
  63. GRB 010214, Optical Observations
  64. GRB010222: Sub-millimeter detection
  65. GRB010222: R-band fading behavior
  66. GRB010222: Optical Observations
  67. GRB010222, optical observations
  68. GRB010222: BeppoSAX/NFI Observations
  69. Redshift of the Optical Transient of GRB010222
  70. GRB010214B,Gamma Ray Observations
  71. GRB010222
  72. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  73. GRB 010220, simultaneous optical observations
  74. GRB010220: BeppoSAX WFC and GRBM preliminary data
  75. BeppoSAX ALERT: GRB010220
  76. GRB010214: BeppoSAX WFC and GRBM preliminary data
  77. GRB 010214: X-Ray afterglow
  78. GRB 010214, Optical Observations
  79. GRB 010214 optical observation
  80. GRB010213 Optical Observation
  81. J-Band Observation of GRB 010214.
  82. GRB010213, Near-IR observations
  83. Possible InfraRed Transient of GRB 010214.
  84. GRB010214 Optical Observation
  85. GRB010214: BeppoSAX/NFI Observations
  86. GRB010213 (HETE) TAROT observations
  87. GRB 010214, optical observations
  88. BeppoSAX ALERT: GRB010214
  89. IPN Status Report
  90. HETE Status
  91. GRB010126 opt. obs.
  92. IPN/RXTE TRIANGULATION OF GRB010126
  93. GRB010126: CONCAM crude optical limits during GRB
  94. GRB010126, TNG R-band observations
  95. IPN TRIANGULATION OF GRB010126
  96. IPN/RXTE TRIANGULATION OF GRB010126
  97. GRB 010119, optical observations
  98. GRB010119: Optical observations
  99. Optical Observations of GRB 001018 at Keck
  100. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)

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