Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35989 results found.

  1. GRB 021211: early break in light curve
  2. GRB021211, BVRI field photometry
  3. GRB 021211, IR observations
  4. GRB 021211, optical observations
  5. GRB 021211: Optical Observations
  6. GRB021211: Kiso Observations
  7. GRB021204: Kiso Observations
  8. GRB 021201, optical observations
  9. GRB 021211: Radio Observations
  10. GRB 021201 (short/hard), NOT observations
  11. SUB-MM SEARCH FOR GRB 021211
  12. GRB 021211 Milagro GeV/TeV Observations
  13. GRB 021211, R- and I-band observations
  14. GRB021211 - Upper limits from recent and historical observations
  15. GRB 021204: I-band Observations
  16. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  17. HETE 2493: Optical observations
  18. GRB 021204: Optical Observations at RIKEN
  19. GRB 021125: Radio Observations
  20. IPN triangulation of GRB021206 (small error box)
  21. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  22. IPN detection of renewed activity from SGR1806-20
  23. IPN triangulation of GRB021205 (large error box)
  24. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  25. GRB021201, BVRcIc field photometry
  26. GRB 021201, Radio Observations
  27. GRB 021201: Optical Observations
  28. GRB 021201: BOOTES simultaneous optical observations
  29. IPN triangulation of GRB021201 (short/hard burst, small error box)
  30. Radio Catalog of GRB Afterglows
  31. GRB021004, late time optical observations
  32. GRB021004 Chandra Observation
  33. IPN detection of continued SGR1900+14 activity
  34. IPN triangulation of GRB021115 (annulus)
  35. IPN triangulation of GRB021125B (two large error boxes)
  36. IPN triangulation of GRB021119 (large error box)
  37. IPN triangulation of GRB021125B (annulus)
  38. Improved IPN error box for GRB021125
  39. IPN triangulation of GRB021125 (INTEGRAL BURST)
  40. GRB021125 : A long GRB localized by INTEGRAL
  41. IPN confirmation of the reactivation of SGR1900+14
  42. IPN detection of possible reactivation of SGR1900+14
  43. GRB021113, SPI ACS observation
  44. IPN triangulation of GRB021119 (annulus)
  45. GRB 021112: Afterglow or Variable Star?
  46. GRB021113: optical observations at Bisei
  47. GRB 021113: Evidence for a Dark Optical Afterglow
  48. GRB 021112, Radio Observations
  49. GRB021112, BVRI field photometry
  50. GRB 021112: Variable Source in R-band search
  51. GRB021112: Optical Observations
  52. GRB021113: Kiso Observations
  53. IPN triangulation of GRB021109 (portion of annulus)
  54. IPN triangulation of GRB021113 (=H2449; annulus)
  55. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  56. GRB 021113: Optical observations
  57. GRB 021112: RAPTOR Observations
  58. GRB 021113: Optical Observations
  59. GRB 021113: Optical Observations
  60. GRB021113 (=H2449): A Long GRB Localized by HETE
  61. GRB 021112: Optical Observations
  62. GRB 021112: R-band search
  63. IPN triangulation of GRB021108 (large error box)
  64. GRB021112 (=H2448): A Long GRB Localized by HETE
  65. GRB 021016: Optical Observations
  66. IPN triangulation of GRB021109 (annulus)
  67. IPN triangulation of GRB021108 (annulus)
  68. IPN triangulation of GRB021104 (annulus)
  69. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  70. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  71. SGR1900+14 activity, November 2-4, 2002
  72. GRB021104: Candidate present in DSS
  73. IPN triangulation of GRB021102 (annulus)
  74. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  75. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  76. IPN triangulation of GRB021025 (portion of annulus)
  77. IPN triangulation of GRB021027 (single large error box)
  78. GRB021004, late-time optical observations
  79. IPN triangulation of GRB021027 (two large error boxes)
  80. GRB 021023: Infrared Imaging
  81. IPN triangulation of GRB021027 (annulus)
  82. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  83. IPN triangulation of GRB021025 (annulus)
  84. IPN triangulation of SGR1900+14, October 22 2002
  85. GRB 021004: optical observations
  86. IPN triangulation of GRB021023 (small error boc)
  87. GRB 020813; likely host galaxy.
  88. IPN triangulation of GRB021020 (smaller error box)
  89. IPN triangulation of GRB021020
  90. GRB 021008, radio observations
  91. GRB 021016, optical observations
  92. GRB 021004: VRI observations at TNG: possible break
  93. GRB021016, optical observations
  94. SGR1900+14: burst on October 10 2002
  95. GRB 021008, optical observations
  96. GRB021016(=H2397): A Long GRB Localized by HETE
  97. IPN triangulation of GRB021016 (small error box)
  98. IPN triangulation of GRB021014 (large error box)
  99. IPN triangulation of GRB021013 (single error box)
  100. GRB 021004: optical spectroscopy on Oct 11

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