Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB021113: Kiso Observations
  2. IPN triangulation of GRB021109 (portion of annulus)
  3. IPN triangulation of GRB021113 (=H2449; annulus)
  4. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  5. GRB 021113: Optical observations
  6. GRB 021112: RAPTOR Observations
  7. GRB 021113: Optical Observations
  8. GRB 021113: Optical Observations
  9. GRB021113 (=H2449): A Long GRB Localized by HETE
  10. GRB 021112: Optical Observations
  11. GRB 021112: R-band search
  12. IPN triangulation of GRB021108 (large error box)
  13. GRB021112 (=H2448): A Long GRB Localized by HETE
  14. GRB 021016: Optical Observations
  15. IPN triangulation of GRB021109 (annulus)
  16. IPN triangulation of GRB021108 (annulus)
  17. GRB021004: Near infrared spectroscopy
  18. GRB021104: Optical Observations
  19. IPN triangulation of GRB021104 (annulus)
  20. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  21. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  22. SGR1900+14 activity, November 2-4, 2002
  23. Spectropolarimetry of GRB021004
  24. GRB021104: Optical observations
  25. GRB021104: optical observations
  26. GRB021104: Candidate present in DSS
  27. GRB021104: possible optical afterglow
  28. IPN triangulation of GRB021102 (annulus)
  29. Detection of activity from SGR 1900+14 with the RXTE/PCA
  30. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  31. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  32. IPN triangulation of GRB021025 (portion of annulus)
  33. IPN triangulation of GRB021027 (single large error box)
  34. GRB021004, late-time optical observations
  35. IPN triangulation of GRB021027 (two large error boxes)
  36. GRB 021023: Infrared Imaging
  37. IPN triangulation of GRB021027 (annulus)
  38. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  39. IPN triangulation of GRB021025 (annulus)
  40. IPN triangulation of SGR1900+14, October 22 2002
  41. GRB 021004: optical observations
  42. IPN triangulation of GRB021023 (small error boc)
  43. GRB021004: Optical Observations
  44. GRB 020813; likely host galaxy.
  45. IPN triangulation of GRB021020 (smaller error box)
  46. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  47. IPN triangulation of GRB021020
  48. GRB 021008, radio observations
  49. GRB 021016, optical observations
  50. GRB 021004: VRI observations at TNG: possible break
  51. GRB021016, optical observations
  52. SGR1900+14: burst on October 10 2002
  53. GRB 021008, optical observations
  54. GRB021016(=H2397): A Long GRB Localized by HETE
  55. IPN triangulation of GRB021016 (area corrected)
  56. IPN triangulation of GRB021016 (small error box)
  57. GRB021004: Optical Observations
  58. IPN triangulation of GRB021014 (large error box)
  59. IPN triangulation of GRB021013 (single error box)
  60. GRB 021004: optical spectroscopy on Oct 11
  61. IPN triangulation of GRB021013 (two small error boxes)
  62. GRB021004: High-resolution optical spectroscopy
  63. IPN triangulation of GRB021013 (annulus)
  64. XRF 020903: flattening of the optical light curve.
  65. GRB021004, UBVRcIc field photometry update
  66. IPN triangulation of GRB021008 (single error box)
  67. GRB021004: Optical Observations
  68. GRB 021004 submm observations
  69. IPN triangulation of GRB021008B (annulus)
  70. IPN triangulation of GRB021008 (two small error boxes)
  71. GRB021004 Chandra HETG Observations
  72. GRB 021004: Optical/NIR Observations
  73. GRB 021004: Additional V-band Polarimetric Observations
  74. GRB021004: optical observation
  75. GRB 021004: Host Galaxy Star Formation Rate
  76. GRB 021004 submm observations
  77. GRB 021004: WC wind?
  78. IPN triangulation of GRB021008
  79. GRB021004: NIR and Optical observations
  80. GRB 021004: Optical measurement at OHP
  81. GRB 021004: Optical observations, AUDE network
  82. GRB 021004 - VLA Radio Observations
  83. GRB 021004 - Unusual Radio-to-Submm Spectrum
  84. GRB 021004: optical spectroscopy
  85. IPN triangulation of GRB021007 (annulus)
  86. XRF 020903 spectrum
  87. GRB 021004: HST/STIS spectroscopic observations
  88. GRB021004: optical observations and predicted break time
  89. GRB021004: BVRc photometry
  90. GRB 021004 redshift
  91. GRB021004 radio observation
  92. GRB021004: restart of optical decay
  93. GRB 021004: Optical Decay
  94. GRB 021004 continued IR fading
  95. HETE fluences for GRB021004
  96. GRB 021004, spectroscopic observations
  97. GRB021004: not fading anymore?
  98. GRB 021004: Optical Photometry at 2.5 Days
  99. GRB 021004: polarimetric observations
  100. GRB 021004: V-band Polarimetric 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