Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB 010222 HST/Chandra TOO
  2. GRB 010222
  3. GRB010222 further R-band photometry
  4. GRB010222: R-band data
  5. GRB010222 Optical observations
  6. GRB 010222: Keck Spectroscopy
  7. GRB010214, field photometry
  8. GRB010222, field photometry
  9. GRB010222 further R-band photometry
  10. GRB010222, possible increase of optical decay slope
  11. GRB 010222 Kyoto optical observation
  12. GRB010222: fading behavior
  13. GRB 010222 BV optical observations
  14. GRB010220, Optical Observations
  15. GRB010222 R-BAND OBSERVATION
  16. GRB 010220: Near-IR Observations
  17. GRB010214 follow-up from Hanle
  18. GRB 010222: Near-IR Observations
  19. GRB 010222: Optical Observations
  20. GRB 010222, Decay Slope Confirmed
  21. GRB010222: Another absorption line system
  22. GRB010222: Optical decay slope
  23. GRB 010214, Optical Observations
  24. GRB010222: Sub-millimeter detection
  25. GRB010222: R-band fading behavior
  26. GRB010222: Optical Observations
  27. GRB010222, radio observations
  28. GRB010222, optical observations
  29. GRB010222: BeppoSAX/NFI Observations
  30. Redshift of the Optical Transient of GRB010222
  31. GRB010214B,Gamma Ray Observations
  32. GRB010222: possible optical counterpart
  33. GRB010222
  34. GRB010222
  35. GRB010222: BeppoSAX refined position
  36. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  37. GRB010220, Radio and Optical Observations
  38. GRB 010220, simultaneous optical observations
  39. GRB010220: BeppoSAX WFC and GRBM preliminary data
  40. GRB010214, candidate optical afterglow
  41. GRB010214, optical observations
  42. BeppoSAX GRB010220: refined position
  43. BeppoSAX ALERT: GRB010220
  44. GRB010214: BeppoSAX WFC and GRBM preliminary data
  45. GRB 010214: X-Ray afterglow
  46. GRB 010214, Optical Observations
  47. GRB 010214 optical observation
  48. GRB010213, Radio Observations
  49. GRB010213 Optical Observation
  50. GRB010213, Radio Observations
  51. J-Band Observation of GRB 010214.
  52. GRB010214, Radio Observations
  53. GRB010214, optical observations
  54. GRB010213, optical observations
  55. GRB010213, Near-IR observations
  56. Possible InfraRed Transient of GRB 010214.
  57. GRB010214 Optical Observation
  58. GRB010214: BeppoSAX/NFI Observations
  59. GRB010213 (HETE) TAROT observations
  60. GRB 010214, optical observations
  61. GRB010213 detected by HETE
  62. GRB010214 refined WFC position
  63. BeppoSAX ALERT: GRB010214
  64. IPN Status Report
  65. HETE Status
  66. GRB010126 opt. obs.
  67. IPN/RXTE TRIANGULATION OF GRB010126
  68. GRB010126: CONCAM crude optical limits during GRB
  69. GRB010126, TNG R-band observations
  70. GRB010126 Optical Observations
  71. GRB010126 optical observations
  72. GRB010126: Optical observations
  73. IPN TRIANGULATION OF GRB010126
  74. IPN/RXTE TRIANGULATION OF GRB010126
  75. GRB 010119, optical observations
  76. GRB010119: Optical observations
  77. Optical Observations of GRB 001018 at Keck
  78. GRB010119, Radio observations
  79. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)
  80. Optical observations of GRB 001018 with JCAM
  81. IPN TRIANGULATION OF GRB010115
  82. IPN TRIANGULATION OF GRB010109
  83. IPN TRIANGULATION OF GRB010109
  84. GRB010103, optical observations
  85. IPN triangulation of GRB010104
  86. IPN triangulation of GRB010103
  87. GRB 001204: Ks observations
  88. H band observation of GRB 001212
  89. GRB & BeppoSAX: ground operations restored back to 24 hrs a day
  90. IPN triangulation of GRB001219
  91. GRB 001212 Optical Observation
  92. GRB 001212 Optical Observation
  93. GRB 001212 optical observation
  94. GRB 001212 possible OA in 2MASS
  95. GRB 001212 possible OA
  96. IPN triangulation of GRB001212
  97. GRB001204: Optical observations
  98. Confirmation of IPN position for GRB001204
  99. GRB001204, Radio observations
  100. IPN triangulation of GRB001204 (short/hard)

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