Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26512 results found.

  1. "Snapshot" afterglow IDs and GRB 000830
  2. GRB000730, Gamma Ray Observations
  3. GRB000812, Radio observations
  4. GRB000801, Gamma Ray Observations
  5. GRB000801, VLT-Antu R-band observations
  6. GRB 991208 Host Galaxy Imaging
  7. IPN localization of GRB000730B
  8. GRB 990510: Possible detection of a host galaxy
  9. GRB 990510 Host Galaxy Discovery
  10. IPN localization of GRB000727
  11. GRB 990712: Late time HST/STIS Observations
  12. GRB 991216, HST/STIS observations
  13. GRB000620, Radio Observations
  14. GRB000630, optical observations
  15. GRB000630, Revised BVRI Field Photometry
  16. GRB000630, Optical Observations
  17. GRB000630, optical observations
  18. GRB000630, optical observations
  19. GRB000630, BVRI Field Photometry
  20. GRB000630, optical observations
  21. GRB000630: Optical observations
  22. GRB000630, Radio Observations
  23. possible optical counterpart of GRB 000630
  24. GRB 000620, optical observations
  25. GRB000418, HST/STIS Observations
  26. GRB990123: Late-time HST/STIS observations of the host
  27. GRB000620, optical observations
  28. GRB000615: H-band observations
  29. GRB990308, HST/STIS observations of the host galaxy
  30. GRB000620 - Optical observations
  31. GRB000620 Optical observations
  32. GRB000620: BeppoSAX WFC and GRBM detection
  33. GRB000607, optical observations
  34. GRB 000615: NIR further observations
  35. GRB990123, HST/STIS observations of the host galaxy
  36. GRB000616 optical observations
  37. GRB 000615, near-infrared observations
  38. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  39. GRB000615, further R-band photometry
  40. GRB 000615: NIR observations
  41. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  42. GRB000615, R-band photometry
  43. The Hosts of GRB 980703 and GRB 971214
  44. GRB 000301C: Further Late-Time HST/STIS observations
  45. GRB000528: follow-up X-ray measurements and update of IPN annulus
  46. GRB980519, HST/STIS observations of the host galaxy
  47. GRB000604 optical non-detection
  48. GRB000604 - Optical observations
  49. GRB000604, optical observations
  50. GRB000528, optical observations at ESO
  51. GRB 000604 optical observations
  52. GRB 000418: Detection of the Host Galaxy
  53. GRB000604, optical observations, comparison with DPOSS
  54. GRB000528, Radio Observations
  55. X-ray Afterglow of GRB 000529
  56. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  57. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  58. GRB 000528 - WFC measurements
  59. GRB000519, BVRI field photometry
  60. IPN triangulation of GRB000519
  61. GRB000508B, optical photometry
  62. GRB000508B, BVR field photometry
  63. Possible GRB-related phenomenon
  64. RXTE/ASM and IPN localization of GRB 000508B
  65. GRB000424, UBVRI field photometry
  66. GRB000418, UBVRI field photometry update
  67. GRB000424, optical observations
  68. GRB 000429, optical observation
  69. GRB 000429, UBVRI field photometry
  70. GRB 000418, UBVRI field photometry
  71. GRB 000418, optical observation
  72. GRB 000418, Optical Observation
  73. GRB000418, near-infrared observations
  74. Correction to IPN error box for GRB000419
  75. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  76. GRB000416 BRJK observations
  77. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  78. GRB 000408, optical observations
  79. GRB 991208, UBVRI field photometry
  80. GRB000408, lotis optical observations
  81. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  82. GRB000301C - Addendum to GCN 623
  83. GRB 000323, optical observations
  84. GRB 000326: Optical Observations
  85. GRB000326, Radio observations
  86. GRB000313, Radio observations
  87. GRB 000313 - optical transient in the BATSE error box
  88. GRB 000307, Optical Observations
  89. GRB 000307, BVRI Field Photometry
  90. GRB 000301C: A Precise Redshift Determination
  91. GRB 000301C, Optical Observation
  92. GRB 000301C: HST/STIS CCD Imaging of the field
  93. IPN error box for GRB000307
  94. GRB000301C, optical R-band observations
  95. GRB 000301C Optical Observations
  96. GRB 000301C: K' Observations
  97. GRB000301C OT candidate optical observations
  98. GRB000301C - Host galaxy not detected in R (?)
  99. Optical observations of GRB000301c
  100. GRB000301C, Radio observations

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