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"

16200 results found.

  1. GRB 030329: Optical afterglow candidate
  2. GRB 030329: Optical afterglow candidate
  3. GRB030328: optical spectroscopy at TNG
  4. GRB030328: optical photometry at the TNG
  5. VLT spectra of GRB 030328
  6. GRB 030328, optical spectroscopy
  7. GRB 030328, optical observations
  8. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  9. GRB 030328: Optical observations
  10. GRB 030328: Finding chart
  11. GRB 030328: Optical afterglow candidate
  12. GRB030323 optical observations
  13. GRB030324 optical observation
  14. GRB030323: Detection on 2003/03/24
  15. GRB 030323: SARA Optical Observations
  16. GRB030324, optical observations
  17. GRB030324, optical observations
  18. GRB 030324: TAROT optical observations
  19. GRB 030324 (HETE #2641): Optical observations
  20. GRB030324, Optical Observations
  21. GRB030323: Upper limits from recent and historical observations.
  22. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  23. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  24. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  25. GRB030323, ROTSE-III detection of possible optical counterpart
  26. GRB030323, optical observations
  27. GRB030323, possible optical counterpart
  28. GRB 030324 optical observations
  29. GRB 030320: Optical Observations
  30. GRB 030324, optical observations
  31. GRB 030227: Optical limit at RIKEN
  32. GRB 030226 Optical observations
  33. GRB030226: Optical observations at Asiago
  34. GRB 030226: Optical observations
  35. GRB 030227: Optical observations
  36. GRB030226, BVRc observations
  37. Chandra detection of the X-ray afterglow of GRB 030226
  38. GRB 030226, further optical/NIR imaging
  39. GRB030227, optical observations
  40. GRB 030226: Ic Observations
  41. GRB030227: Kiso optical upper limit
  42. GRB030227, BVRcIc field photometry
  43. GRB030226, BVRcIc field calibration
  44. GRB 030227 optical afterglow
  45. GRB 030228, optical observations
  46. GRB 030226: Steep Decline
  47. GRB 030227: Confirmed Optical Afterglow (S1-A)
  48. GRB 030226: R band polarimetric observations
  49. GRB 030226: Optical observations
  50. GRB 030227: fading of candidate optical afterglow 'S1-A'
  51. GRB030227:Optical observations
  52. GRB 20030226: Upper limits from recent and historical observations
  53. GRB 030227, possible optical counterpart of XMM-Newton source
  54. GRB030227 - faint tentative OT candidate
  55. GRB 030226, optical observations
  56. GRB030227: Kiso optical observations
  57. GRB 030227: Kyoto optical observation
  58. GRB 030226, optical light curve
  59. GRB 030226 spectroscopy
  60. GRB 030226 : Predicted light curve
  61. GRB030226: optical observation
  62. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  63. GRB 030226 simultaneous optical observations
  64. GRB 030226, optical observations
  65. GRB030226: optical observations and refined redshift
  66. GRB030226: Optical decay index
  67. GRB 030226 Optical Spectra and R,I,z' Imaging
  68. GRB 030226, optical observations
  69. GRB 030226: Optical afterglow
  70. GRB030226: Candidate optical afterglow
  71. GRB 030217: Optical Observations at 4, 5, and 6 Days
  72. GRB030217: optical observations
  73. GRB 030131: marginal optical detection
  74. GRB 030204: Optical Observations
  75. GRB030131: Candidate Optical Afterglow
  76. GRB 030115: Optical Observations
  77. GRB 030204, optical observations
  78. GRB 030131, optical observations
  79. GRB030131: Kiso optical limit for corrected position
  80. GRB030131: Optical limits for corrected position
  81. GRB 030115, late-time optical observations
  82. Type Ic SN2003L (SN/GRB?), optical spectrum
  83. GRB 020819: Host galaxy at Radio Position
  84. GRB 020819: afterglow candidate
  85. GRB030131: Optical limit
  86. GRB 030131 optical observations
  87. GRB 030131 optical observations
  88. Type Ic SN2003L (SN/GRB?) Radio Observations
  89. GRB 030115, simultaneous observations by BOOTES-1
  90. GRB030115: R-band counterpart of IR candidate
  91. GRB 021211: R-band observations at late-time
  92. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  93. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  94. GRB030115: TAROT optical observations
  95. GRB 030115: APO Optical Observations
  96. GRB 030115, no optical candidate
  97. GRB 030115, optical observations
  98. GRB 030115, optical candidate
  99. GRB 021211: Probable Host and Underlying Supernova
  100. GRB021211, radio 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