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"

26559 results found.

  1. GRB 021004 submm observations
  2. GRB 021004: WC wind?
  3. GRB021004: NIR and Optical observations
  4. GRB 021004: Optical observations, AUDE network
  5. GRB 021004 - VLA Radio Observations
  6. GRB 021004 - Unusual Radio-to-Submm Spectrum
  7. GRB 021004: optical spectroscopy
  8. IPN triangulation of GRB021007 (annulus)
  9. GRB021004: optical observations and predicted break time
  10. GRB021004: BVRc photometry
  11. GRB021004 radio observation
  12. HETE fluences for GRB021004
  13. GRB 021004: Optical Photometry at 2.5 Days
  14. GRB 021004: polarimetric observations
  15. GRB 021004: V-band Polarimetric Observations
  16. GRB021004: Update Bisei photometric data
  17. IRAM Millimeter detection of GRB 021004
  18. GRB 021004 radio observation
  19. GRB 021004: Optical Observations
  20. GRB021004: continued fading
  21. GRB 021004: Optical Photometry at 1.5 Days
  22. GRB021004, BVRcIc field photometry
  23. GRB 021004: Optical observations
  24. GRB 021004: optical counterpart
  25. GRB 021004 radio search
  26. XRF020903, BVRI field photometry
  27. GRB021004: optical observations at Bisei
  28. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  29. XRF020903: TNG and Asiago photometry
  30. GRB 020903: Optical observations at RIKEN
  31. XRF 020903: Correction to GCN 1560
  32. XRF 020903: VRI observations
  33. XRF 020903: R band observations
  34. XRF 020903: Archival Optical Images
  35. Radio Observations of XRF 020903: The Missing Link
  36. XRF 020903: Supernova
  37. IPN triangulation of GRB020926 (two large error boxes)
  38. IPN triangulation of GRB020923 (two error boxes)
  39. IPN triangulation of GRB020914B
  40. IPN triangulation of GRB020911 (2 large error boxes)
  41. GRB 020305: HST/STIS observations
  42. Confirmation of IPN error box for GRB020910
  43. IPN triangulation of GRB020910
  44. IPN GCN Circulars now to be issued without restriction
  45. Single IPN error box for GRB020904
  46. XRF 020903: optical observation at Kyoto
  47. GRB020322 : HST/STIS observations
  48. XRF 020903: Optical observations
  49. IPN triangulation of GRB020904
  50. XRF 020903, optical observations
  51. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  52. INTEGRAL GRBs added to GCN
  53. SGR1900+14 burst localized by HETE
  54. GRB020819: optical observations at Bisei
  55. GRB020812: negative optical observations
  56. GRB 020812: optical observation at Kyoto University
  57. Second epoch K band imaging of GRB 020819
  58. GRB 020813 : HST observations
  59. Confirming no variability for GRB02081
  60. GRB020819 : Optical observations at KISO
  61. GRB 020812: early time optical observation at Ouda Station
  62. GRB020813: Magellan BVRI Photometry
  63. GRB 020819: Optical observations
  64. K band observation of GRB 020819
  65. HETE 2275: Optical observations
  66. GRB020813: optical and NIR observations
  67. GRB020813: Fading X-ray Afterglow Observed with Chandra
  68. GRB020813, UBVRI field calibration
  69. GRB020812: NIR observations
  70. Polarimetry of GRB020813: evidence for variability
  71. GRB020813 IRAM millimeter observations
  72. GRB020812: optical observations
  73. GRB020813: High-Resolution Optical Observations
  74. GRB 020812: optical observation at Bisei
  75. GRB020812: optical observations
  76. GRB 020813 : KISO multiband optical observations
  77. GRB020813, optical observations
  78. IPN error box for GRB020813
  79. GRB020813, astrometric position
  80. GRB020813: Fading of Candidate OT
  81. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  82. GRB 020812 optical observation
  83. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  84. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  85. HST Imaging of the Host of GRB 011121
  86. GRB020801, optical afterglow candidate
  87. GRB020331: Late-time Optical Light Curve (re-submission)
  88. GRB020331: Late-time Optical Light Curve
  89. IPN triangulation of GRB020714
  90. IPN triangulation of GRB020715 (=GRB150702)
  91. IPN triangulation of GRB020714
  92. IPN triangulation of GRB150702
  93. GRB 020410: Discovery of Probable OT by HST
  94. IPN triangulation of GRB020708
  95. IPN triangulation of GRB020708
  96. Correction to IPN error box for GRB020706
  97. IPN triangulation of GRB020706
  98. GRB 020705: Optical observations
  99. GRB 020625, optical observations
  100. GRB 020625: Optical observations

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