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"

36153 results found.

  1. IPN confirmation of the reactivation of SGR1900+14
  2. IPN detection of possible reactivation of SGR1900+14
  3. GRB021113, SPI ACS observation
  4. IPN triangulation of GRB021119 (annulus)
  5. GRB 021112: Afterglow or Variable Star?
  6. GRB021113: optical observations at Bisei
  7. GRB 021113: Evidence for a Dark Optical Afterglow
  8. GRB 021112, Radio Observations
  9. GRB021112, BVRI field photometry
  10. GRB 021112: Variable Source in R-band search
  11. GRB021112: Optical Observations
  12. GRB021113: Kiso Observations
  13. IPN triangulation of GRB021109 (portion of annulus)
  14. IPN triangulation of GRB021113 (=H2449; annulus)
  15. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  16. GRB 021113: Optical observations
  17. GRB 021112: RAPTOR Observations
  18. GRB 021113: Optical Observations
  19. GRB 021113: Optical Observations
  20. GRB021113 (=H2449): A Long GRB Localized by HETE
  21. GRB 021112: Optical Observations
  22. GRB 021112: R-band search
  23. IPN triangulation of GRB021108 (large error box)
  24. GRB021112 (=H2448): A Long GRB Localized by HETE
  25. GRB 021016: Optical Observations
  26. IPN triangulation of GRB021109 (annulus)
  27. IPN triangulation of GRB021108 (annulus)
  28. IPN triangulation of GRB021104 (annulus)
  29. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  30. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  31. SGR1900+14 activity, November 2-4, 2002
  32. GRB021104: Candidate present in DSS
  33. IPN triangulation of GRB021102 (annulus)
  34. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  35. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  36. IPN triangulation of GRB021025 (portion of annulus)
  37. IPN triangulation of GRB021027 (single large error box)
  38. GRB021004, late-time optical observations
  39. IPN triangulation of GRB021027 (two large error boxes)
  40. GRB 021023: Infrared Imaging
  41. IPN triangulation of GRB021027 (annulus)
  42. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  43. IPN triangulation of GRB021025 (annulus)
  44. IPN triangulation of SGR1900+14, October 22 2002
  45. GRB 021004: optical observations
  46. IPN triangulation of GRB021023 (small error boc)
  47. GRB 020813; likely host galaxy.
  48. IPN triangulation of GRB021020 (smaller error box)
  49. IPN triangulation of GRB021020
  50. GRB 021008, radio observations
  51. GRB 021016, optical observations
  52. GRB 021004: VRI observations at TNG: possible break
  53. GRB021016, optical observations
  54. SGR1900+14: burst on October 10 2002
  55. GRB 021008, optical observations
  56. GRB021016(=H2397): A Long GRB Localized by HETE
  57. IPN triangulation of GRB021016 (small error box)
  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. GRB021004, UBVRcIc field photometry update
  65. IPN triangulation of GRB021008 (single error box)
  66. GRB 021004 submm observations
  67. IPN triangulation of GRB021008B (annulus)
  68. IPN triangulation of GRB021008 (two small error boxes)
  69. GRB 021004: Optical/NIR Observations
  70. GRB 021004: Additional V-band Polarimetric Observations
  71. GRB021004: optical observation
  72. GRB 021004: Host Galaxy Star Formation Rate
  73. GRB 021004 submm observations
  74. GRB 021004: WC wind?
  75. IPN triangulation of GRB021008
  76. GRB 021004: Optical measurement at OHP
  77. GRB 021004: Optical observations, AUDE network
  78. GRB 021004 - VLA Radio Observations
  79. GRB 021004 - Unusual Radio-to-Submm Spectrum
  80. GRB 021004: optical spectroscopy
  81. IPN triangulation of GRB021007 (annulus)
  82. GRB 021004: HST/STIS spectroscopic observations
  83. GRB021004: optical observations and predicted break time
  84. GRB 021004 redshift
  85. GRB 021004: Optical Decay
  86. GRB 021004 continued IR fading
  87. HETE fluences for GRB021004
  88. GRB 021004, spectroscopic observations
  89. GRB021004: not fading anymore?
  90. GRB 021004: Optical Photometry at 2.5 Days
  91. GRB 021004: polarimetric observations
  92. GRB 021004: V-band Polarimetric Observations
  93. GRB 021004: Optical Decay
  94. GRB021004, astrometric position
  95. GRB021004, Optical Observations
  96. IRAM Millimeter detection of GRB 021004
  97. GRB 021004: Optical observations at RIKEN
  98. GRB 021004 radio observation
  99. GRB 021004: Optical Observations
  100. GRB021004: continued fading

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