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"

36101 results found.

  1. IPN triangulation of GRB030223 (annulus)
  2. IPN triangulation of GRB030220 (annulus)
  3. GRB: Non-Referencing of GCN Circulars.
  4. IPN triangulation of GRB030218 (annulus)
  5. IPN triangulation of GRB030217 (small error box)
  6. IPN triangulation of GRB030215C (annulus)
  7. IPN triangulation of GRB030217 (annulus)
  8. IPN triangulation of GRB030216 (annulus)
  9. IPN triangulation of GRB030215A and GRB030215B (annuli)
  10. GRB030115, WSRT radio observations - correction to GCN 1864
  11. GRB 030131: marginal optical detection
  12. GRB030115, WSRT radio observations
  13. IPN triangulation of GRB030206 (annulus)
  14. IPN triangulation of GRB030208 (annulus)
  15. GRB 030204: Optical Observations
  16. GRB030204 field photometry
  17. GRB020819: Kiso R and I band observations
  18. GRB 030204: Correction to GCN 1856
  19. GRB 030115: Optical Observations
  20. GRB 030204, optical observations
  21. IPN triangulation of GRB030204 (small error box)
  22. IPN triangulation of GRB030202 (annulus)
  23. GRB 030131, optical observations
  24. GRB030131: Kiso optical limit for corrected position
  25. GRB030131: Optical limits for corrected position
  26. GRB 030131: afterglow candidate
  27. GRB 030115, late-time optical observations
  28. GRB030131: corrected INTEGRAL position
  29. Type Ic SN2003L (SN/GRB?), optical spectrum
  30. GRB030131: Kiso Observations
  31. GRB 020819: Host galaxy at Radio Position
  32. IPN triangulation of GRB030131 - CORRECTION
  33. GRB 020819: afterglow candidate
  34. IPN triangulation of GRB030131
  35. GRB 030131 optical observations
  36. GRB 030131 optical observations
  37. A long GRB detected by INTEGRAL
  38. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  39. Type Ic SN2003L (SN/GRB?) Radio Observations
  40. IPN triangulation of GRB030127 (annulus)
  41. GRB030115 submm upper limit
  42. IPN triangulation of GRB030119 (two large error boxes)
  43. GRB 030115: Further IR observations with IRSF/SIRIUS
  44. IPN triangulation of GRB030117 (two large error boxes)
  45. Publicizing GRB Discoveries - A Message from NASA HQ
  46. GRB 030115: Radio detection of IR candidate
  47. GRB 030115, simultaneous observations by BOOTES-1
  48. GRB 030115: IR observations with IRSF/SIRIUS
  49. IPN triangulation of GRB030115C (large error box)
  50. GRB030115: R-band counterpart of IR candidate
  51. GRB030115, afterglow candidate
  52. GRB 021211: R-band observations at late-time
  53. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  54. IPN triangulation of GRB030115B (small error box)
  55. GRB 030115 : Possible IR counterpart
  56. GRB 030115: Radio Observations
  57. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  58. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  59. IPN triangulation of GRB030115B (annulus)
  60. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  61. Distribution of INTEGRAL SPI-ACS triggers
  62. GRB030115: R-band observations at Asiago
  63. GRB030115: TAROT optical observations
  64. GRB 021211: VLT spectrum
  65. GRB 030115: APO Optical Observations
  66. GRB 030115, no optical candidate
  67. GRB 030115, optical observations
  68. GRB 030115, optical candidate
  69. Possible GRB030113 seen by SPI ACS
  70. Probable GRB030112B seen by SPI ACS
  71. Probable GRB030112 seen by SPI ACS
  72. Possible GRB030111 seen by SPI ACS
  73. Possible GRB030110b seen by SPI ACS
  74. Possible GRB 030110 seen by SPI ACS
  75. IPN triangulation of GRB030109 (annulus)
  76. IPN triangulation of GRB030105 (large error box)
  77. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  78. Possible GRB 20030109 seen by SPI ACS
  79. IPN triangulation of GRB030102B (portion of annulus)
  80. IPN triangulation of GRB030102A (large error box)
  81. Possible GRB20030107 seen by SPI-ACS
  82. Possible GRB 20030105 seen by SPI ACS
  83. IPN triangulation of GRB030102 (annulus)
  84. GRB on 20030102 seen by SPI-ACS
  85. VLT spectroscopy of the probable host of GRB 021211
  86. GRB on 20030101 seen by SPI-ACS
  87. IPN triangulation of GRB030101 (two large error boxes)
  88. GRB021226
  89. GRB 021211: Probable Host and Underlying Supernova
  90. GRB 021226 registration by Helicon/Coronas-F
  91. Probable GRB in INTEGRAL SPI-ACS
  92. IPN triangulation of GRB021223 (two large error boxes)
  93. GRB021211, radio observations
  94. GRB 021112: Evidence for Another Dark Optical Afterglow
  95. GRB 021219: OSN optical observations
  96. GRB021219: Radio Observations
  97. IPN triangulation of GRB021219 - CORRECTION
  98. IPN triangulation of GRB021219
  99. GRB021219, optical observation by MASTER
  100. GRB021219: Correction to GCN 1766

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