Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

35350 results found.

  1. GRB021125 : A long GRB localized by INTEGRAL
  2. IPN confirmation of the reactivation of SGR1900+14
  3. IPN detection of possible reactivation of SGR1900+14
  4. GRB021113, SPI ACS observation
  5. IPN triangulation of GRB021119 (annulus)
  6. GRB 021112: Afterglow or Variable Star?
  7. GRB021113: optical observations at Bisei
  8. GRB 021113: Evidence for a Dark Optical Afterglow
  9. GRB 021112, Radio Observations
  10. GRB021112, BVRI field photometry
  11. GRB 021112: Variable Source in R-band search
  12. GRB021112: Optical Observations
  13. GRB021113: Kiso Observations
  14. IPN triangulation of GRB021109 (portion of annulus)
  15. IPN triangulation of GRB021113 (=H2449; annulus)
  16. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  17. GRB 021113: Optical observations
  18. GRB 021112: RAPTOR Observations
  19. GRB 021113: Optical Observations
  20. GRB 021113: Optical Observations
  21. GRB021113 (=H2449): A Long GRB Localized by HETE
  22. GRB 021112: Optical Observations
  23. GRB 021112: R-band search
  24. IPN triangulation of GRB021108 (large error box)
  25. GRB021112 (=H2448): A Long GRB Localized by HETE
  26. GRB 021016: Optical Observations
  27. IPN triangulation of GRB021109 (annulus)
  28. IPN triangulation of GRB021108 (annulus)
  29. IPN triangulation of GRB021104 (annulus)
  30. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  31. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  32. SGR1900+14 activity, November 2-4, 2002
  33. GRB021104: Candidate present in DSS
  34. IPN triangulation of GRB021102 (annulus)
  35. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  36. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  37. IPN triangulation of GRB021025 (portion of annulus)
  38. IPN triangulation of GRB021027 (single large error box)
  39. GRB021004, late-time optical observations
  40. IPN triangulation of GRB021027 (two large error boxes)
  41. GRB 021023: Infrared Imaging
  42. IPN triangulation of GRB021027 (annulus)
  43. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  44. IPN triangulation of GRB021025 (annulus)
  45. IPN triangulation of SGR1900+14, October 22 2002
  46. GRB 021004: optical observations
  47. IPN triangulation of GRB021023 (small error boc)
  48. GRB 020813; likely host galaxy.
  49. IPN triangulation of GRB021020 (smaller error box)
  50. IPN triangulation of GRB021020
  51. GRB 021008, radio observations
  52. GRB 021016, optical observations
  53. GRB 021004: VRI observations at TNG: possible break
  54. GRB021016, optical observations
  55. SGR1900+14: burst on October 10 2002
  56. GRB 021008, optical observations
  57. GRB021016(=H2397): A Long GRB Localized by HETE
  58. IPN triangulation of GRB021016 (small error box)
  59. IPN triangulation of GRB021014 (large error box)
  60. IPN triangulation of GRB021013 (single error box)
  61. GRB 021004: optical spectroscopy on Oct 11
  62. IPN triangulation of GRB021013 (two small error boxes)
  63. GRB021004: High-resolution optical spectroscopy
  64. IPN triangulation of GRB021013 (annulus)
  65. GRB021004, UBVRcIc field photometry update
  66. IPN triangulation of GRB021008 (single error box)
  67. GRB 021004 submm observations
  68. IPN triangulation of GRB021008B (annulus)
  69. IPN triangulation of GRB021008 (two small error boxes)
  70. GRB 021004: Optical/NIR Observations
  71. GRB 021004: Additional V-band Polarimetric Observations
  72. GRB021004: optical observation
  73. GRB 021004: Host Galaxy Star Formation Rate
  74. GRB 021004 submm observations
  75. GRB 021004: WC wind?
  76. IPN triangulation of GRB021008
  77. GRB 021004: Optical measurement at OHP
  78. GRB 021004: Optical observations, AUDE network
  79. GRB 021004 - VLA Radio Observations
  80. GRB 021004 - Unusual Radio-to-Submm Spectrum
  81. GRB 021004: optical spectroscopy
  82. IPN triangulation of GRB021007 (annulus)
  83. GRB 021004: HST/STIS spectroscopic observations
  84. GRB021004: optical observations and predicted break time
  85. GRB 021004 redshift
  86. GRB 021004: Optical Decay
  87. GRB 021004 continued IR fading
  88. HETE fluences for GRB021004
  89. GRB 021004, spectroscopic observations
  90. GRB021004: not fading anymore?
  91. GRB 021004: Optical Photometry at 2.5 Days
  92. GRB 021004: polarimetric observations
  93. GRB 021004: V-band Polarimetric Observations
  94. GRB 021004: Optical Decay
  95. GRB021004, astrometric position
  96. GRB021004, Optical Observations
  97. IRAM Millimeter detection of GRB 021004
  98. GRB 021004: Optical observations at RIKEN
  99. GRB 021004 radio observation
  100. GRB 021004: Optical Observations

Advanced

Download all Circulars as a .tar.gz archive:
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