Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

28062 results found.

  1. GRB030329, optical observation
  2. MASTER:optical observations GRB030418
  3. MASTER:optical observations probable GRB030414
  4. GRB030418: Kiso near infrared observations
  5. GRB 030418: Optical afterglow
  6. OT GRB 030329: early UBVRcIc spectral evolution
  7. OT GRB 030329: early spectrum
  8. IPN triangulation of GRB030414 (small error box)
  9. IPN triangulation of GRB030413 (small error box)
  10. Superluminal motion in GRB 030329 (Correction)
  11. Superluminal motion in GRB 030329
  12. GRB030329, optical position
  13. IPN triangulation of GRB030406 (small error box)
  14. IPN triangulation of GRB050403 (small error box)
  15. GRB 030329: BVRI photometry at Asiago
  16. GRB 030329: VLT V-band photometry
  17. Kiso observation of the GRB030329 at April 6
  18. GRB 030329, color evolution
  19. GRB030328, UBVRcIc field photometry
  20. GRB 030329 Optical observations
  21. GRB030329: Kiso B and R band observations
  22. GRB030328: R upper limit after 6 hours by MASTER
  23. SDSS 0.5m PT observations of GRB030329 (correction)
  24. SDSS 0.5m PT observations of GRB030329
  25. GRB030329: final R-band light curve by MASTER
  26. GRB030329, optical observation
  27. GRB030329, new UBVRcIc field photometry
  28. GRB 030329, light curve and SN prediction
  29. GRB 030329, BRI photometry
  30. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  31. GRB030329: Optical observations at Teramo
  32. GRB 030329: Radio observations at GMRT
  33. Further AAVSO V,B,R observations of GRB030329
  34. GRB 030329: Additional Mt. Laguna Optical Observations
  35. GRB 030329: Observations with ANDICAM
  36. GRB030329: further optical photometry and evidence for a light curve discontinuity
  37. triangulation of GRB 030331 (single error box)
  38. GRB 030329: optical observations
  39. Photometry of GRB030329 - Constant OT Magnitude
  40. GRB030329 - OT brightens
  41. GRB 030329, optical photometry
  42. GRB 030324: Optical and NIR Observations
  43. GRB030329: R band light curve by MASTER
  44. GRB030329 - Light curve flattening
  45. GRB 030324, optical search
  46. GRB 030329, optical observations
  47. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  48. GRB030329a: detection by Konus-Wind
  49. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  50. GRB030329, BVRcIc field photometry
  51. GRB030329, SPM optical observations
  52. GRB 030329: Optical decay and synthesis
  53. GRB030329 optical observations
  54. GRB 030329: Optical pre-Imaging
  55. GRB 030329: Upper limit from 5.6 hours before trigger
  56. GRB030328: X-ray Afterglow Observed with Chandra
  57. GRB 030329, R-band observations
  58. GRB 030329: OT B and R photometry, decline rate
  59. GRB030329: Upper limits from recent and historical observations.
  60. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  61. GRB 030329: Optical Afterglow Observations
  62. GRB 030328: optical observations
  63. GRB 030329: Optical afterglow fading
  64. GRB 030328: OT photometry
  65. GRB030328: optical spectroscopy at TNG
  66. GRB030328: optical photometry at the TNG
  67. VLT spectra of GRB 030328
  68. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  69. GRB 030328: Optical observations
  70. GRB030324 optical observation
  71. GRB030131, BVRcIc field photometry
  72. Possible GRB030323 localized by INTEGRAL
  73. GRB030323: Detection on 2003/03/24
  74. IPN triangulation of GRB030326 (single small error box)
  75. IPN triangulation of GRB030325 (two small error boxes)
  76. GRB030323: V, R, I photometry
  77. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  78. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  79. VLT/FORS2 spectra of GRB 030323
  80. GRB030323, optical observations
  81. GRB030324, BVRcIc field photometry
  82. GRB030323, BVRcIc field calibration
  83. IPN triangulation of GRB030320 (small error box)
  84. Possible GRB 030320 localized by INTEGRAL
  85. IPN triangulation of GRB030306 (single small error box - REVISED)
  86. IPN triangulation of GRB030306 (single small error box)
  87. IPN triangulation of GRB030306 (two small error boxes)
  88. GRB030226, BVRc observations
  89. Chandra detection of the X-ray afterglow of GRB 030226
  90. GRB030227: Kiso optical upper limit
  91. GRB030227, BVRcIc field photometry
  92. GRB030226, BVRcIc field calibration
  93. GRB 030228, optical observations
  94. GRB 030227: Confirmed Optical Afterglow (S1-A)
  95. GRB 030227: fading of candidate optical afterglow 'S1-A'
  96. GRB030227:Optical observations
  97. GRB 030227, possible optical counterpart of XMM-Newton source
  98. GRB030227 - faint tentative OT candidate
  99. GRB 030226, optical observations
  100. XMM-Newton observation of GRB030227

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