Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

36352 results found.

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

Advanced

Download all Circulars as a .tar.gz archive:
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