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"

32552 results found.

  1. Optical Observations of GRB 001018 at Keck
  2. GRB010119, Radio observations
  3. Optical observations of GRB 001018 with JCAM
  4. IPN TRIANGULATION OF GRB010109
  5. GRB 001204: Ks observations
  6. H band observation of GRB 001212
  7. GRB 001212 Optical Observation
  8. GRB 001212 Optical Observation
  9. GRB 001212 optical observation
  10. GRB 001212 possible OA in 2MASS
  11. GRB 001212 possible OA
  12. GRB001204: Optical observations
  13. Confirmation of IPN position for GRB001204
  14. GRB001204, Radio observations
  15. GRB 001105, further optical observations
  16. GRB001120: Gunn-i observations
  17. GRB001109, optical observations
  18. WSRT 4.8 GHz observations of GRB001109
  19. Optical/NIR observations of GRB001109
  20. GRB 001109: deep JHK upper limits
  21. GRB 001109 X-ray afterglow with BeppoSAX
  22. CORRECTION to XMM-Newton observation of GRB001025
  23. GRB001109: Optical observations
  24. GRB001109, R-band optical observations
  25. GRB001109, Radio observations
  26. GRB001105 BVRI field photometry correction
  27. GRB001105, BVRI field photometry
  28. GRB 001105, R-band observation
  29. GRB 991208: HST Imaging of the Host Galaxy
  30. GRB000926: R-image of the host galaxy
  31. GRB 001025B, I-band observations
  32. XMM-Newton observation of GRB001025
  33. GRB001025B, Radio observations
  34. GRB 001025 Optical Observations
  35. GRB 001025A, optical observation
  36. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  37. IPN triangulation of GRB001025
  38. GRB001007: Optical observations
  39. GRB001007, Radio observations
  40. GRB 001018, Possible Radio Afterglow
  41. CORRECTION TO PEAK FLUX OF GRB001018
  42. GRB 000926: Improved Absorber Redshift
  43. V,R,I band observations of GRB000926
  44. The Likely Optical/Infrared Afterglow of GRB 001011
  45. HETE positions added to GCN
  46. GRB 001007, BVR-band observations
  47. GRB001007: Optical observations
  48. CONCAM null result on GRB001005
  49. GRB 000926 : the host galaxy
  50. GRB 000926 Chandra Observation
  51. Public availability of BeppoSAX data of GRB000926
  52. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  53. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  54. GRB000926 - Optical observations
  55. GRB000926 - Optical observations
  56. GRB 000926, Optical Decay
  57. GRB000911: VLT infrared observation
  58. GRB000926 - Optical observations
  59. GRB000926 - Optical observations
  60. GRB 000926: optical observations
  61. GRB 000926, Optical Observations
  62. GRB000926 - Optical observations
  63. GRB000911: optical VLT observations
  64. GRB000926 : increasing optical decay slope
  65. GRB000926 optical observations
  66. GRB000926 - Optical observations
  67. Re: GRB 000926, optical observation by Oksanen (vsnet-grb)
  68. J and K band observations of GRB 000926
  69. GRB000911 Optical Observations
  70. GRB 000926: Lightcurve Update and Predictions
  71. GRB 000926, optical observation by Oksanen (vsnet-grb)
  72. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  73. GRB000926: Optical observations
  74. GRB 000926: Preliminary R-band Lightcurve
  75. GRB 000926 HST/Chandra TOO Status
  76. Spectroscopic Redshift of GRB 000926
  77. GRB 000926, Optical Observation
  78. GRB000926, radio observations
  79. GRB 000926: Optical candidate
  80. Optical candidate for GRB000926
  81. IPN triangulation of GRB000926
  82. GRB 000911, BVRI field photometry
  83. GRB000911: Corrected coordinates
  84. GRB000911: Sub-millimeter observations
  85. GRB000911: Optical Transient
  86. GRB000911, Radio and Optical observations
  87. GRB000911, Radio observations
  88. GRB000911: Optical observations
  89. False GRB alarm from RXTE/ASM on 8 Sept 2000
  90. GRB 000830: Optical observations
  91. GRB000830: Optical observations
  92. GRB000830, TNG B-band observations
  93. GRB000830: Optical observations
  94. GRB000210, Optical observations
  95. Chandra Position of GRB000210
  96. GRB000830: Optical observations
  97. HST/STIS observations of the host galaxy of GRB 980329
  98. HST/STIS observations of the chaotic environment of GRB 980613
  99. GRB000812, TNG R-band observations
  100. GRB000801 & GRB000730, Gamma Ray Observations

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