Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

45423 results found.

  1. GRB010412: BeppoSAX GRBM and WFC observations
  2. IPN Triangulation of GRB010412
  3. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  4. BeppoSAX GRB ALERT: GRB010412
  5. GRB Observation Report
  6. GRB010324, revised field photometry
  7. REVISED LOCATION OF GRB010326A
  8. GRB 980326: Late-time HST/STIS observations
  9. GRB010324, field photometry
  10. GRB010326B, field photometry
  11. GRB010326, field photometry
  12. GRB010220, field photometry
  13. Further Optical Observations of GRB 010324
  14. GRB010222, CXO X-ray observations
  15. GRB 010326A: Further optical observations
  16. GRB010324: BeppoSAX/GRBM data
  17. GRB 010326B: Optical observations
  18. GRB010324, optical observations
  19. GRB010326B: Localization by HETE (2nd GRB for this date)
  20. GRB 010326: Optical observations
  21. GRB 010326 optical observations
  22. GRB010326: Refined Localization by HETE
  23. GRB010326: Localization by HETE
  24. Duration, ECT, peak flux and fluence of GRB010324
  25. Optical Observations of GRB 010324
  26. IPN TRIANGULATION OF GRB010324
  27. GRB990705, VLT-FORS1 observations of the host galaxy
  28. GRB010222, late-time optical observation
  29. Support extension to the BeppoSAX mission
  30. GRB 010222 - HEGRA GeV/TeV Observations
  31. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  32. GRB010222: Chandra X-ray Observatory Observation
  33. GRB010222: Sub-millimeter vanishing act
  34. GRB010222 - Optical observation
  35. GRB 010222, Optical Observations
  36. GRB010220 optical obsercations
  37. GRB010222 - Optical observation
  38. GRB 010222: High-Resolution Keck Spectroscopy
  39. GRB010222: Optical observation and decay
  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. GRB010220, Optical Observations
  57. GRB010222 R-BAND OBSERVATION
  58. GRB 010220: Near-IR Observations
  59. GRB010214 follow-up from Hanle
  60. GRB 010222: Near-IR Observations
  61. GRB 010222: Optical Observations
  62. GRB 010222, Decay Slope Confirmed
  63. GRB010222: Another absorption line system
  64. GRB010222: Optical decay slope
  65. GRB 010214, Optical Observations
  66. GRB010222: Sub-millimeter detection
  67. GRB010222: R-band fading behavior
  68. GRB010222: Optical Observations
  69. GRB010222, radio observations
  70. GRB010222, optical observations
  71. GRB010222: BeppoSAX/NFI Observations
  72. Redshift of the Optical Transient of GRB010222
  73. GRB010214B,Gamma Ray Observations
  74. GRB010222: possible optical counterpart
  75. GRB010222
  76. GRB010222: BeppoSAX refined position
  77. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  78. GRB010220, Radio and Optical Observations
  79. GRB 010220, simultaneous optical observations
  80. GRB010220: BeppoSAX WFC and GRBM preliminary data
  81. GRB010214, candidate optical afterglow
  82. GRB010214, optical observations
  83. BeppoSAX GRB010220: refined position
  84. BeppoSAX ALERT: GRB010220
  85. GRB010214: BeppoSAX WFC and GRBM preliminary data
  86. GRB 010214: X-Ray afterglow
  87. GRB 010214, Optical Observations
  88. GRB 010214 optical observation
  89. GRB010213, Radio Observations
  90. GRB010213 Optical Observation
  91. GRB010213, Radio Observations
  92. J-Band Observation of GRB 010214.
  93. GRB010214, Radio Observations
  94. GRB010214, optical observations
  95. GRB010213, optical observations
  96. GRB010213, Near-IR observations
  97. Possible InfraRed Transient of GRB 010214.
  98. GRB010214 Optical Observation
  99. GRB010214: BeppoSAX/NFI Observations
  100. GRB010213 (HETE) TAROT observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov