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"

36132 results found.

  1. IPN triangulation of GRB010612
  2. HETE Fully-Automated GCN Notices
  3. GRB000301C: Late-time HST/STIS observation
  4. GRB010518: a faint BeppoSAX detection
  5. GRB000418: HST/STIS Second-epoch Observations
  6. GRB010427, Gamma Ray Observations
  7. SGR1900+14
  8. GRB 010222 /corrections to VBT data
  9. Possible precursor to the SGR1900+14 giant burst
  10. IPN Triangulation of the Giant Flare from SGR1900+14
  11. GRB010412, field photometry
  12. GRB 010326b Optical Observations
  13. GRB010412: Optical observations
  14. GRB010412: Optical observations
  15. IPN Triangulation of GRB010412
  16. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  17. BeppoSAX GRB ALERT: GRB010412
  18. GRB Observation Report
  19. GRB010324, revised field photometry
  20. REVISED LOCATION OF GRB010326A
  21. GRB 980326: Late-time HST/STIS observations
  22. GRB010324, field photometry
  23. GRB010326B, field photometry
  24. GRB010326, field photometry
  25. GRB010220, field photometry
  26. Further Optical Observations of GRB 010324
  27. GRB 010326A: Further optical observations
  28. GRB010324: BeppoSAX/GRBM data
  29. GRB 010326B: Optical observations
  30. GRB010324, optical observations
  31. GRB010326B: Localization by HETE (2nd GRB for this date)
  32. GRB 010326: Optical observations
  33. GRB 010326 optical observations
  34. GRB010326: Refined Localization by HETE
  35. GRB010326: Localization by HETE
  36. Duration, ECT, peak flux and fluence of GRB010324
  37. Optical Observations of GRB 010324
  38. IPN TRIANGULATION OF GRB010324
  39. GRB990705, VLT-FORS1 observations of the host galaxy
  40. GRB010222, late-time optical observation
  41. Support extension to the BeppoSAX mission
  42. GRB 010222 - HEGRA GeV/TeV Observations
  43. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  44. GRB010222: Chandra X-ray Observatory Observation
  45. GRB010222: Sub-millimeter vanishing act
  46. GRB 010222, Optical Observations
  47. GRB 010222: High-Resolution Keck Spectroscopy
  48. GRB 010214, I-band data
  49. Sub-millimeter Excess/GRB 010222
  50. GRB 010222
  51. GRB 010222 HST/Chandra TOO
  52. GRB 010222
  53. GRB010222 further R-band photometry
  54. GRB010222: R-band data
  55. GRB010222 Optical observations
  56. GRB 010222: Keck Spectroscopy
  57. GRB010214, field photometry
  58. GRB010222, field photometry
  59. GRB010222 further R-band photometry
  60. GRB010222, possible increase of optical decay slope
  61. GRB 010222 Kyoto optical observation
  62. GRB010222: fading behavior
  63. GRB 010222 BV optical observations
  64. GRB 010220: Near-IR Observations
  65. GRB010214 follow-up from Hanle
  66. GRB 010222: Near-IR Observations
  67. GRB 010222: Optical Observations
  68. GRB 010222, Decay Slope Confirmed
  69. GRB010222: Another absorption line system
  70. GRB010222: Optical decay slope
  71. GRB 010214, Optical Observations
  72. GRB010222: Sub-millimeter detection
  73. GRB010222: R-band fading behavior
  74. GRB010222: Optical Observations
  75. GRB010222, optical observations
  76. GRB010222: BeppoSAX/NFI Observations
  77. Redshift of the Optical Transient of GRB010222
  78. GRB010214B,Gamma Ray Observations
  79. GRB010222
  80. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  81. GRB 010220, simultaneous optical observations
  82. GRB010220: BeppoSAX WFC and GRBM preliminary data
  83. BeppoSAX ALERT: GRB010220
  84. GRB010214: BeppoSAX WFC and GRBM preliminary data
  85. GRB 010214: X-Ray afterglow
  86. GRB 010214, Optical Observations
  87. GRB 010214 optical observation
  88. GRB010213 Optical Observation
  89. J-Band Observation of GRB 010214.
  90. GRB010213, Near-IR observations
  91. Possible InfraRed Transient of GRB 010214.
  92. GRB010214 Optical Observation
  93. GRB010214: BeppoSAX/NFI Observations
  94. GRB010213 (HETE) TAROT observations
  95. GRB 010214, optical observations
  96. BeppoSAX ALERT: GRB010214
  97. IPN Status Report
  98. HETE Status
  99. GRB010126 opt. obs.
  100. IPN/RXTE TRIANGULATION OF GRB010126

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