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"

35427 results found.

  1. GRB000210, Optical observations
  2. Chandra Position of GRB000210
  3. "Snapshot" afterglow IDs and GRB 000830
  4. IPN triangulation of GRB000830
  5. HST/STIS observations of the host galaxy of GRB 980329
  6. HST/STIS observations of the chaotic environment of GRB 980613
  7. IPN localization of GRB000820
  8. GRB000801 & GRB000730, Gamma Ray Observations
  9. GRB000730, Gamma Ray Observations
  10. GRB000812, Radio observations
  11. IPN localization of GRB000812
  12. IPN localization of GRB000811
  13. GRB000801, Gamma Ray Observations
  14. GRB000801, VLT-Antu R-band observations
  15. GRB 991208 Host Galaxy Imaging
  16. Updated IPN coordinates for GRB000801
  17. IPN localization of GRB000801
  18. IPN localization of GRB000730B
  19. IPN localization of GRB000730B
  20. IPN localization of GRB000730
  21. GRB 990510: Possible detection of a host galaxy
  22. GRB 990510 Host Galaxy Discovery
  23. GRB 000727, optical observations
  24. IPN localization of GRB000727
  25. GRB 990705, HST/STIS observations of the host galaxy
  26. GRB 990712: Late time HST/STIS Observations
  27. GRB 991216, HST/STIS observations
  28. GRB981226, HST/STIS observations of the host galaxy
  29. GRB 000630: Detection of the Optical Afterglow
  30. GRB000630, Revised BVRI Field Photometry
  31. GRB000630, Optical Observations
  32. GRB000630, optical observations
  33. GRB000630, BVRI Field Photometry
  34. GRB000630, optical observations
  35. GRB000630: Optical observations
  36. possible optical counterpart of GRB 000630
  37. IPN triangulation of GRB000630
  38. GRB 000623, optical observations
  39. GRB 000620, optical observations
  40. GRB000418, HST/STIS Observations
  41. GRB990123: Late-time HST/STIS observations of the host
  42. GRB 990506, HST/STIS Observations of the Host Galaxy
  43. GRB000623
  44. GRB 000620: J-band observations
  45. GRB990308, HST/STIS observations of the host galaxy
  46. IPN annulus for GRB000620
  47. GRB000615, Radio observations
  48. GRB000607, optical observations
  49. GRB 000615: NIR further observations
  50. BeppoSAX ALERT: GRB000620
  51. GRB000620: BeppoSAX Alert
  52. GRB990123, HST/STIS observations of the host galaxy
  53. GRB 000615, near-infrared observations
  54. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  55. GRB000616 [IPN Position]
  56. GRB000615B [IPN Position]
  57. GRB000615, further R-band photometry
  58. GRB 000615: NIR observations
  59. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  60. GRB000615, R-band photometry
  61. GRB980425, HST/STIS observations of the host galaxy
  62. GRB000615: BeppoSAX GRB Alert
  63. The Hosts of GRB 980703 and GRB 971214
  64. GRB 000301C: Further Late-Time HST/STIS observations
  65. GRB000528: follow-up X-ray measurements and update of IPN annulus
  66. GRB980519, HST/STIS observations of the host galaxy
  67. GRB000607, Radio Observations
  68. GRB000604 - Optical observations
  69. GRB000607, A SHORT, HARD BURST
  70. GRB000604, optical observations
  71. GRB000528, optical observations at ESO
  72. GRB 000604 optical observations
  73. GRB 000418: Detection of the Host Galaxy
  74. GRB000604, optical observations, comparison with DPOSS
  75. GRB000604 [IPN Position]
  76. X-ray Afterglow of GRB 000529
  77. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  78. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  79. IPN localization and time history of GRB000528
  80. New IPN localization of GRB000529
  81. GRB 000528 - WFC measurements
  82. GRB000528: BeppoSAX GRBM observations
  83. GRB 000528 Optical Observations
  84. GRB000519, BVRI field photometry
  85. IPN triangulation of GRB000519
  86. IPN triangulation of GRB000516
  87. Re: GRB000508B : Optical observations
  88. GRB 000418, Optical observation
  89. GRB000508B, optical photometry
  90. GRB000508B, BVR field photometry
  91. Possible GRB-related phenomenon
  92. RXTE/ASM and IPN localization of GRB 000508B
  93. GRB000424, UBVRI field photometry
  94. GRB 000424 Optical Observations
  95. GRB000418, UBVRI field photometry update
  96. The redshift of GRB 000418
  97. GRB 000429, optical observation
  98. GRB 000429, UBVRI field photometry
  99. IPN localization of GRB000429
  100. GRB 000418, UBVRI field photometry

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