Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

45495 results found.

  1. Support extension to the BeppoSAX mission
  2. GRB 010222 - HEGRA GeV/TeV Observations
  3. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  4. GRB010222: Chandra X-ray Observatory Observation
  5. GRB010222: Sub-millimeter vanishing act
  6. GRB010222 - Optical observation
  7. GRB 010222, Optical Observations
  8. GRB010220 optical obsercations
  9. GRB010222 - Optical observation
  10. GRB 010222: High-Resolution Keck Spectroscopy
  11. GRB010222: Optical observation and decay
  12. GRB 010214, I-band data
  13. Sub-millimeter Excess/GRB 010222
  14. GRB 010222
  15. GRB 010222 HST/Chandra TOO
  16. GRB 010222
  17. GRB010222 further R-band photometry
  18. GRB010222: R-band data
  19. GRB010222 Optical observations
  20. GRB 010222: Keck Spectroscopy
  21. GRB010214, field photometry
  22. GRB010222, field photometry
  23. GRB010222 further R-band photometry
  24. GRB010222, possible increase of optical decay slope
  25. GRB 010222 Kyoto optical observation
  26. GRB010222: fading behavior
  27. GRB 010222 BV optical observations
  28. GRB010220, Optical Observations
  29. GRB010222 R-BAND OBSERVATION
  30. GRB 010220: Near-IR Observations
  31. GRB010214 follow-up from Hanle
  32. GRB 010222: Near-IR Observations
  33. GRB 010222: Optical Observations
  34. GRB 010222, Decay Slope Confirmed
  35. GRB010222: Another absorption line system
  36. GRB010222: Optical decay slope
  37. GRB 010214, Optical Observations
  38. GRB010222: Sub-millimeter detection
  39. GRB010222: R-band fading behavior
  40. GRB010222: Optical Observations
  41. GRB010222, radio observations
  42. GRB010222, optical observations
  43. GRB010222: BeppoSAX/NFI Observations
  44. Redshift of the Optical Transient of GRB010222
  45. GRB010214B,Gamma Ray Observations
  46. GRB010222: possible optical counterpart
  47. GRB010222
  48. GRB010222: BeppoSAX refined position
  49. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  50. GRB010220, Radio and Optical Observations
  51. GRB 010220, simultaneous optical observations
  52. GRB010220: BeppoSAX WFC and GRBM preliminary data
  53. GRB010214, candidate optical afterglow
  54. GRB010214, optical observations
  55. BeppoSAX GRB010220: refined position
  56. BeppoSAX ALERT: GRB010220
  57. GRB010214: BeppoSAX WFC and GRBM preliminary data
  58. GRB 010214: X-Ray afterglow
  59. GRB 010214, Optical Observations
  60. GRB 010214 optical observation
  61. GRB010213, Radio Observations
  62. GRB010213 Optical Observation
  63. GRB010213, Radio Observations
  64. J-Band Observation of GRB 010214.
  65. GRB010214, Radio Observations
  66. GRB010214, optical observations
  67. GRB010213, optical observations
  68. GRB010213, Near-IR observations
  69. Possible InfraRed Transient of GRB 010214.
  70. GRB010214 Optical Observation
  71. GRB010214: BeppoSAX/NFI Observations
  72. GRB010213 (HETE) TAROT observations
  73. GRB 010214, optical observations
  74. GRB010213 detected by HETE
  75. GRB010214 refined WFC position
  76. BeppoSAX ALERT: GRB010214
  77. IPN Status Report
  78. HETE Status
  79. GRB010126 opt. obs.
  80. IPN/RXTE TRIANGULATION OF GRB010126
  81. GRB010126: CONCAM crude optical limits during GRB
  82. GRB010126, TNG R-band observations
  83. GRB010126 Optical Observations
  84. GRB010126 optical observations
  85. GRB010126: Optical observations
  86. IPN TRIANGULATION OF GRB010126
  87. IPN/RXTE TRIANGULATION OF GRB010126
  88. GRB 010119, optical observations
  89. GRB010119: Optical observations
  90. Optical Observations of GRB 001018 at Keck
  91. GRB010119, Radio observations
  92. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)
  93. Optical observations of GRB 001018 with JCAM
  94. IPN TRIANGULATION OF GRB010115
  95. IPN TRIANGULATION OF GRB010109
  96. IPN TRIANGULATION OF GRB010109
  97. GRB010103, optical observations
  98. IPN triangulation of GRB010104
  99. IPN triangulation of GRB010103
  100. GRB 001204: Ks 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