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"

36211 results found.

  1. GRB 021219: OSN optical observations
  2. GRB021219: Radio Observations
  3. IPN triangulation of GRB021219 - CORRECTION
  4. IPN triangulation of GRB021219
  5. GRB021219, optical observation by MASTER
  6. GRB021219: Correction to GCN 1766
  7. VLT spectra of GRB 021211 revisited
  8. GRB021219: a long GRB localized by INTEGRAL
  9. IPN detection of continued activity from SGR1806-20
  10. IPN triangulation of GRB021215 (large error box)
  11. IPN triangulation of GRB021214 (annulus)
  12. XRF 020903 : HST observations
  13. GRB 021201: Optical Observations
  14. GRB 021211, optical observations
  15. GRB 021211: CTIO observations
  16. GRB021211: Measurement of Early Time Afterglow
  17. VLT spectrum of GRB 021211
  18. IPN triangulation of GRB021211B (two large error boxes)
  19. GRB 021211: early break in light curve
  20. GRB021211, BVRI field photometry
  21. GRB 021211, IR observations
  22. GRB 021211, optical observations
  23. GRB 021211: Optical Observations
  24. GRB021211: Kiso Observations
  25. GRB021204: Kiso Observations
  26. GRB 021201, optical observations
  27. GRB 021211: Radio Observations
  28. GRB 021201 (short/hard), NOT observations
  29. SUB-MM SEARCH FOR GRB 021211
  30. GRB 021211 Milagro GeV/TeV Observations
  31. GRB 021211, R- and I-band observations
  32. GRB021211 - Upper limits from recent and historical observations
  33. GRB 021204: I-band Observations
  34. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  35. HETE 2493: Optical observations
  36. GRB 021204: Optical Observations at RIKEN
  37. GRB 021125: Radio Observations
  38. IPN triangulation of GRB021206 (small error box)
  39. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  40. IPN detection of renewed activity from SGR1806-20
  41. IPN triangulation of GRB021205 (large error box)
  42. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  43. GRB021201, BVRcIc field photometry
  44. GRB 021201, Radio Observations
  45. GRB 021201: Optical Observations
  46. GRB 021201: BOOTES simultaneous optical observations
  47. IPN triangulation of GRB021201 (short/hard burst, small error box)
  48. Radio Catalog of GRB Afterglows
  49. GRB021004, late time optical observations
  50. GRB021004 Chandra Observation
  51. IPN detection of continued SGR1900+14 activity
  52. IPN triangulation of GRB021115 (annulus)
  53. IPN triangulation of GRB021125B (two large error boxes)
  54. IPN triangulation of GRB021119 (large error box)
  55. IPN triangulation of GRB021125B (annulus)
  56. Improved IPN error box for GRB021125
  57. IPN triangulation of GRB021125 (INTEGRAL BURST)
  58. GRB021125 : A long GRB localized by INTEGRAL
  59. IPN confirmation of the reactivation of SGR1900+14
  60. IPN detection of possible reactivation of SGR1900+14
  61. GRB021113, SPI ACS observation
  62. IPN triangulation of GRB021119 (annulus)
  63. GRB 021112: Afterglow or Variable Star?
  64. GRB021113: optical observations at Bisei
  65. GRB 021113: Evidence for a Dark Optical Afterglow
  66. GRB 021112, Radio Observations
  67. GRB021112, BVRI field photometry
  68. GRB 021112: Variable Source in R-band search
  69. GRB021112: Optical Observations
  70. GRB021113: Kiso Observations
  71. IPN triangulation of GRB021109 (portion of annulus)
  72. IPN triangulation of GRB021113 (=H2449; annulus)
  73. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  74. GRB 021113: Optical observations
  75. GRB 021112: RAPTOR Observations
  76. GRB 021113: Optical Observations
  77. GRB 021113: Optical Observations
  78. GRB021113 (=H2449): A Long GRB Localized by HETE
  79. GRB 021112: Optical Observations
  80. GRB 021112: R-band search
  81. IPN triangulation of GRB021108 (large error box)
  82. GRB021112 (=H2448): A Long GRB Localized by HETE
  83. GRB 021016: Optical Observations
  84. IPN triangulation of GRB021109 (annulus)
  85. IPN triangulation of GRB021108 (annulus)
  86. IPN triangulation of GRB021104 (annulus)
  87. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  88. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  89. SGR1900+14 activity, November 2-4, 2002
  90. GRB021104: Candidate present in DSS
  91. IPN triangulation of GRB021102 (annulus)
  92. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  93. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  94. IPN triangulation of GRB021025 (portion of annulus)
  95. IPN triangulation of GRB021027 (single large error box)
  96. GRB021004, late-time optical observations
  97. IPN triangulation of GRB021027 (two large error boxes)
  98. GRB 021023: Infrared Imaging
  99. IPN triangulation of GRB021027 (annulus)
  100. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization

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