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"

19212 results found.

  1. IPN triangulation of GRB001120
  2. Optical/NIR observations of GRB001109
  3. GRB 001109: deep JHK upper limits
  4. GRB 001109 X-ray afterglow with BeppoSAX
  5. CORRECTION to XMM-Newton observation of GRB001025
  6. GRB001109, Radio observations
  7. IPN TRIANGULATION OF GRB001105
  8. GRB 991208: HST Imaging of the Host Galaxy
  9. XMM-Newton observation of GRB001025
  10. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  11. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  12. ASM Localization of GRB 001025
  13. GRB 001018, Possible Radio Afterglow
  14. GRB001018, Gamma Ray Observations
  15. IPN TRIANGULATION OF GRB001019
  16. IPN TRIANGULATION OF GRB001018
  17. IPN TRIANGULATION OF GRB 001017
  18. V,R,I band observations of GRB000926
  19. HETE positions added to GCN
  20. GRB 001007, BVR-band observations
  21. IPN triangulation of GRB001005
  22. HETE-2 48 hour Launch Delay
  23. IPN triangulation of GRB 001004
  24. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  25. GRB000926 - Optical observations
  26. GRB000926 - Optical observations
  27. GRB 000926, Optical Decay
  28. GRB000911: VLT infrared observation
  29. GRB000926 K'-band Observation
  30. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  31. GRB 000926: Preliminary R-band Lightcurve
  32. Spectroscopic Redshift of GRB 000926
  33. GRB000911, Radio and Optical observations
  34. IPN triangulation of GRB000911
  35. IPN triangulation of GRB000910
  36. GRB000210, Optical observations
  37. "Snapshot" afterglow IDs and GRB 000830
  38. SGR 1806-20 burst activity
  39. GRB000730, Gamma Ray Observations
  40. GRB000812, Radio observations
  41. IPN localization of GRB000812
  42. GRB000801, Gamma Ray Observations
  43. GRB 991208 Host Galaxy Imaging
  44. IPN localization of GRB000730B
  45. IPN localization of GRB000730
  46. IPN localization of GRB000727
  47. GRB 990712: Late time HST/STIS Observations
  48. GRB 991216, HST/STIS observations
  49. GRB000620, Radio Observations
  50. GRB000630, Optical Observations
  51. GRB000630, Radio Observations
  52. possible optical counterpart of GRB 000630
  53. IPN triangulation of GRB000630
  54. GRB000623
  55. GRB000615: H-band observations
  56. GRB990308, HST/STIS observations of the host galaxy
  57. GRB000607, optical observations
  58. GRB990123, HST/STIS observations of the host galaxy
  59. GRB 000615, near-infrared observations
  60. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  61. GRB000615B [IPN Position]
  62. The Hosts of GRB 980703 and GRB 971214
  63. GRB000528: follow-up X-ray measurements and update of IPN annulus
  64. GRB980519, HST/STIS observations of the host galaxy
  65. GRB000604 optical non-detection
  66. GRB000607, A SHORT, HARD BURST
  67. GRB000604, optical observations
  68. GRB 000604 optical observations
  69. GRB 000418: Detection of the Host Galaxy
  70. GRB000528, Radio Observations
  71. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  72. IPN triangulation of GRB000519
  73. IPN triangulation of GRB000516
  74. GRB000424, optical observations
  75. IPN localization of GRB000429
  76. GRB000418, near-infrared observations
  77. Correction to IPN error box for GRB000419
  78. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  79. GRB000416 BRJK observations
  80. GRB 000408, optical observations
  81. Refined IPN error box for GRB000408
  82. GRB000408, lotis optical observations
  83. GRB000408 [IPN Position]
  84. GRB 000323, optical observations
  85. GRB 000326: Optical Observations
  86. GRB 000313 - optical transient in the BATSE error box
  87. GRB 000307, Optical Observations
  88. GRB 000301C: A Precise Redshift Determination
  89. GRB 000301C, Optical Observation
  90. IPN error box for GRB000307
  91. GRB000301C, optical R-band observations
  92. GRB000301c - R photometry and nearby faint source confirmation
  93. GRB 000301C Optical Observations
  94. GRB 000301C: K' Observations
  95. GRB000301C OT candidate optical observations
  96. GRB000301C - Host galaxy not detected in R (?)
  97. GRB000301C, near-infrared observations (JHK' imaging)
  98. GRB 000301c near-IR observations
  99. GRB000301C 250 GHz detection
  100. GRB000301C, optical 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