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"

42907 results found.

  1. GRB030329 - Light curve flattening
  2. GRB 030329: SARA Optical Observations
  3. GRB 030324, optical search
  4. GRB030329 - near contemporaneous optical limits from CONCAM
  5. GRB030329: R and B observations
  6. GRB 030329, optical observations
  7. GRB030329: Optical observations
  8. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  9. GRB030329a: detection by Konus-Wind
  10. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  11. GRB 030329: Light curve observed during the change of its slope.
  12. GRB030329, BVRcIc field photometry
  13. GRB030329, SPM optical observations
  14. GRB 030329: Optical Decay
  15. Redshift of GRB 030329
  16. GRB030329: ROTSE network observes steepening of decay curve
  17. GRB 030329, optical photometry
  18. GRB 030329: Optical decay and synthesis
  19. GRB030329 optical observations
  20. GRB030329: optical spectroscopy with the TNG
  21. GRB 030329: Radio Observations
  22. GRB 030329, optical spectroscopy
  23. GRB 030329: still bright
  24. GRB 030329: Optical pre-Imaging
  25. GRB 030329: visual observations
  26. GRB 030329: Upper limit from 5.6 hours before trigger
  27. GRB030328: R optical observation
  28. GRB030328: X-ray Afterglow Observed with Chandra
  29. GRB 030323: Gemini South VRI obsevations.
  30. GRB030329: Optical observations
  31. GRB030329 optical observations
  32. GRB030329:optical observations by MASTER
  33. GRB 030329: optical observations
  34. GRB 030329, R-band observations
  35. GRB 030329: OT B and R photometry, decline rate
  36. GRB030329: Upper limits from recent and historical observations.
  37. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  38. RXTE detection of GRB 030329 afterglow
  39. GRB 030329: Optical Afterglow Observations
  40. GRB 030329: precise position from Kyoto images
  41. GRB 030328 Optical Observations
  42. GRB030328: Decay index
  43. GRB 030328: Optical observations
  44. GRB 030328: optical observations
  45. GRB 030329: Optical afterglow fading
  46. GRB 030329: Optical afterglow candidate
  47. GRB 030329: OT candidate
  48. GRB 030329: Optical afterglow candidate
  49. GRB 030328: OT photometry
  50. GRB030328: optical spectroscopy at TNG
  51. GRB030328: optical photometry at the TNG
  52. VLT spectra of GRB 030328
  53. GRB 030328, optical spectroscopy
  54. GRB 030328, optical observations
  55. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  56. GRB 030328: Optical observations
  57. GRB 030328: Finding chart
  58. GRB 030328: Optical afterglow candidate
  59. GRB030323 optical observations
  60. GRB030324 optical observation
  61. GRB030131, BVRcIc field photometry
  62. Possible GRB030323 localized by INTEGRAL
  63. IPN triangulation of GRB030325 (final analysis)
  64. GRB030323: Detection on 2003/03/24
  65. IPN triangulation of GRB030326 (single small error box)
  66. GRB 030323: SARA Optical Observations
  67. IPN triangulation of GRB030325 (single small error box)
  68. GRB030324, optical observations
  69. GRB030324, optical observations
  70. IPN triangulation of GRB030325 (two small error boxes)
  71. GRB 030324: TAROT optical observations
  72. GRB030323: V, R, I photometry
  73. GRB 030324 (HETE #2641): Optical observations
  74. GRB030324, Optical Observations
  75. GRB030323: Upper limits from recent and historical observations.
  76. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  77. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  78. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  79. VLT/FORS2 spectra of GRB 030323
  80. GRB030323, ROTSE-III detection of possible optical counterpart
  81. GRB030323, optical observations
  82. GRB030324, BVRcIc field photometry
  83. GRB030323, possible optical counterpart
  84. GRB030323, BVRcIc field calibration
  85. GRB 030324 optical observations
  86. GRB 030320: Optical Observations
  87. GRB 030324, optical observations
  88. IPN triangulation of GRB030320B (annulus)
  89. IPN triangulation of GRB030320 (small error box)
  90. IPN triangulation of GRB030320
  91. Possible GRB 030320 localized by INTEGRAL
  92. GRB030226, addendum to GCN 1892
  93. IPN upper limit to a GRB associated with SN2003L
  94. IPN triangulation of GRB030317 (annulus)
  95. IPN triangulation of GRB030307 (annulus)
  96. GRB 030227: Optical limit at RIKEN
  97. GRB 030226 Optical observations
  98. IPN triangulation of GRB030306 (single small error box - REVISED)
  99. GRB030226: Optical observations at Asiago
  100. IPN triangulation of GRB030306 (single small error box)

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