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"

36208 results found.

  1. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  2. RXTE detection of GRB 030329 afterglow
  3. GRB 030329: Optical Afterglow Observations
  4. GRB 030329: precise position from Kyoto images
  5. GRB 030328 Optical Observations
  6. GRB 030328: Optical observations
  7. GRB 030328: optical observations
  8. GRB 030329: Optical afterglow fading
  9. GRB 030329 follow-up
  10. GRB 030329: Optical afterglow candidate
  11. GRB 030329: OT candidate
  12. GRB 030329: Optical afterglow candidate
  13. GRB 030328: OT photometry
  14. VLT spectra of GRB 030328
  15. GRB 030328, optical spectroscopy
  16. GRB 030328, optical observations
  17. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  18. GRB 030328: Optical observations
  19. Re: GRB 030328: Finding chart
  20. GRB 030328: Finding chart
  21. GRB 030328: Optical afterglow candidate
  22. GRB030131, BVRcIc field photometry
  23. Possible GRB030323 localized by INTEGRAL
  24. IPN triangulation of GRB030325 (final analysis)
  25. IPN triangulation of GRB030326 (single small error box)
  26. GRB 030323: SARA Optical Observations
  27. IPN triangulation of GRB030325 (single small error box)
  28. GRB030324, optical observations
  29. IPN triangulation of GRB030325 (two small error boxes)
  30. GRB 030324: TAROT optical observations
  31. GRB 030324 (HETE #2641): Optical observations
  32. GRB030324, Optical Observations
  33. GRB030323: Upper limits from recent and historical observations.
  34. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  35. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  36. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  37. VLT/FORS2 spectra of GRB 030323
  38. GRB030323, ROTSE-III detection of possible optical counterpart
  39. GRB030323, optical observations
  40. GRB030324, BVRcIc field photometry
  41. GRB030323, possible optical counterpart
  42. GRB030323, BVRcIc field calibration
  43. GRB 030324 optical observations
  44. GRB 030320: Optical Observations
  45. GRB 030324, optical observations
  46. IPN triangulation of GRB030320B (annulus)
  47. IPN triangulation of GRB030320 (small error box)
  48. IPN triangulation of GRB030320
  49. Possible GRB 030320 localized by INTEGRAL
  50. IPN upper limit to a GRB associated with SN2003L
  51. IPN triangulation of GRB030317 (annulus)
  52. IPN triangulation of GRB030307 (annulus)
  53. GRB 030227: Optical limit at RIKEN
  54. GRB 030226 Optical observations
  55. IPN triangulation of GRB030306 (single small error box - REVISED)
  56. GRB030226: Optical observations at Asiago
  57. IPN triangulation of GRB030306 (single small error box)
  58. IPN triangulation of GRB030306 (two small error boxes)
  59. IPN triangulation of GRB030306 (intense; annulus only so far)
  60. GRB 030226: Optical observations
  61. IPN triangulation of GRB030304 (annulus)
  62. GRB 030227: Optical observations
  63. GRB030226, BVRc observations
  64. Chandra detection of the X-ray afterglow of GRB 030226
  65. GRB 030226, further optical/NIR imaging
  66. GRB030227, optical observations
  67. GRB 030226: Ic Observations
  68. GRB030227: Kiso optical upper limit
  69. IPN triangulation of GRB030301 (annulus)
  70. IPN triangulation of GRB030228 (annulus)
  71. GRB030227, BVRcIc field photometry
  72. GRB030226, BVRcIc field calibration
  73. GRB 030227 optical afterglow
  74. 030302: NOT A GRB
  75. 030228: NOT A GRB
  76. GRB 030228, optical observations
  77. GRB 030226: Steep Decline
  78. GRB 030227: Confirmed Optical Afterglow (S1-A)
  79. GRB 030226: R band polarimetric observations
  80. GRB 030226: Optical observations
  81. GRB 030227: fading of candidate optical afterglow 'S1-A'
  82. GRB030227:Optical observations
  83. GRB 20030226: Upper limits from recent and historical observations
  84. GRB 030227, possible optical counterpart of XMM-Newton source
  85. GRB030227 - faint tentative OT candidate
  86. GRB 030226, optical observations
  87. GRB030227: Kiso optical observations
  88. GRB 030227: Kyoto optical observation
  89. GRB 030226, optical light curve
  90. GRB 030226 spectroscopy
  91. Possible break in the GRB 030226 light curve
  92. GRB 030226 : Predicted light curve
  93. IPN triangulation of GRB030225 (annulus)
  94. GRB 030226: Confirmed decay index
  95. GRB030226: ESI spectroscopy
  96. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  97. GRB 030226 simultaneous optical observations
  98. Two absorption systems in GRB 030226
  99. GRB 030226, optical observations
  100. GRB 030226 Optical Spectra and R,I,z' Imaging

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