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"

36314 results found.

  1. IPN GCN Circulars now to be issued without restriction
  2. Single IPN error box for GRB020904
  3. XRF 020903: optical observation at Kyoto
  4. GRB020322 : HST/STIS observations
  5. IPN triangulation of GRB020904
  6. IPN detection of a burst from SGR1900+14
  7. INTEGRAL GRBs added to GCN
  8. GRB020813: High-resolution optical spectroscopy
  9. GRB 020812: optical observation at Kyoto University
  10. Second epoch K band imaging of GRB 020819
  11. GRB020813, Baade 6.5m data now available
  12. GRB 020813 : HST observations
  13. Confirming no variability for GRB02081
  14. GRB020819 : Optical observations at KISO
  15. GRB 020812: early time optical observation at Ouda Station
  16. GRB020813: VRI Decay Slopes
  17. GRB 020819 : OT candidate - confirmation of non variability
  18. GRB 020819: Optical observations
  19. K band observation of GRB 020819
  20. GRB020819: optical observations
  21. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  22. IPN triangulation of GRB020819 (HETE 2275)
  23. GRB020813, UBVRI field calibration
  24. GRB 020813: addendum to GCN 1498
  25. GRB020813: optical observations at Bisei
  26. GRB020813: V-band decay slope
  27. Polarimetry of GRB020813: evidence for variability
  28. GRB020813 IRAM millimeter observations
  29. GRB020812: optical observations
  30. GRB 020812: optical observation at Bisei
  31. GRB020813: optical observations; possible host galaxy
  32. GRB 020813, radio detection
  33. GRB 020812 : optical afterglow candidate
  34. Millimeter observation of GRB 020813
  35. GRB020812: optical observations
  36. GRB 020813 : KISO multiband optical observations
  37. IPN error box for GRB020813
  38. IPN triangulation of GRB020813
  39. GRB020812: possible afterglow candidate
  40. Early Time Limits for GRB020813
  41. GRB020812: possible afterglow candidate
  42. GRB020813, astrometric position
  43. Spectropolarimetry of GRB 020813
  44. GRB 020813 Afterglow Observations; Possible break
  45. GRB 020813: Absorption redshift
  46. GRB 020813 multiband optical observations
  47. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  48. GRB 020812 optical observation
  49. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  50. GRB 020715, optical observations
  51. GRB 020714, optical observations
  52. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  53. HST Imaging of the Host of GRB 011121
  54. GRB020801, optical afterglow candidate
  55. Further refinement to IPN error box for GRB020531
  56. GRB020331: Late-time Optical Light Curve (re-submission)
  57. GRB020331: Late-time Optical Light Curve
  58. GRB 020405: HST observations reveal red bump
  59. IPN triangulation of GRB020714
  60. IPN triangulation of GRB020715 (=GRB150702)
  61. IPN triangulation of GRB020714
  62. IPN triangulation of GRB150702
  63. GRB 020410: Discovery of Probable OT by HST
  64. GRB 020124, HST observations of the fading afterglow
  65. IPN triangulation of GRB020708
  66. IPN triangulation of GRB020708
  67. IPN error box for GRB020706
  68. IPN triangulation of GRB020706
  69. GRB 020705: Optical observations
  70. GRB 020625, optical observations
  71. GRB 020625: Optical observations
  72. GRB 020531: optical photometry of Chandra sources
  73. GRB020625 (=H2081): A Long Burst Localized by HETE
  74. The Probable Host Galaxy of GRB/XRF 020427
  75. GRB/XRF 020427, detection of an underlying system with the VLT
  76. GRB 020531, INT+WFC deep optical upper limits
  77. GRB020405: polarimetric observations
  78. GRB 020531, simultaneous optical observations
  79. GRB 020604, optical observations
  80. GRB 020531/Candidate Redshift
  81. GRB020531: Second epoch Chandra observations
  82. GRB020604, optical observations
  83. GRB020604, BVRcIc field photometry
  84. GRB020603, BVRcIc field observations
  85. GRB020531, BVRcIc field photometry
  86. GRB020531 Optical observations with TAROT
  87. GRB020531 Optical observations with TAROT
  88. GRB 020418, optical/near-IR observations
  89. GRB 020531, Radio Observations
  90. IPN triangulation of GRB020604
  91. GRB020531: Observations with the Chandra X-ray Observatory
  92. GRB 020603: Optical Observations
  93. GRB 020603, R-band observation
  94. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  95. GRB 020603: Optical observations
  96. IPN triangulation of GRB020603 (possible short/hard GRB)
  97. GRB 020531 optical observations with TAROT
  98. Refined IPN error box for GRB020531
  99. GRB020531, optical observations
  100. GRB020531(=H2042): 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