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"

19247 results found.

  1. GRB030329, SPM optical observations (Correction)
  2. GRB030329, SPM optical observations
  3. GRB 030329, the review of the sky area in plate archive (1950-1998)
  4. GRB 030329: optical spectropolarimetry at VLT
  5. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  6. IPN triangulation of GRB030422 (two large error boxes)
  7. GRB030329, optical observation
  8. GRB030418: Upper limits from recent and historical observations.
  9. GRB 030418: Optical afterglow
  10. GRB 030418: Optical afterglow candidate
  11. OT GRB 030329: early UBVRcIc spectral evolution
  12. OT GRB 030329: early spectrum
  13. IPN triangulation of GRB030414 (small error box)
  14. IPN triangulation of GRB030413 (small error box)
  15. Superluminal motion in GRB 030329 (Correction)
  16. Superluminal motion in GRB 030329
  17. IPN triangulation of GRB030406 (small error box)
  18. IPN triangulation of GRB050403 (small error box)
  19. GRB 030329: BVRI photometry at Asiago
  20. GRB 030329: VLT V-band photometry
  21. Kiso observation of the GRB030329 at April 6
  22. GRB 030329, color evolution
  23. GRB 030329, color evolution
  24. GRB030329: Kiso B and R band observations
  25. GRB030329: More AAVSO VR obs
  26. GRB030328: R upper limit after 6 hours by MASTER
  27. GRB030329, optical observation
  28. GRB 030329, light curve and SN prediction
  29. GRB 030329, BRI photometry
  30. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  31. GRB 030329 , SPM optical observations
  32. Further AAVSO V,B,R observations of GRB030329
  33. GRB 030329: Additional Mt. Laguna Optical Observations
  34. GRB030329: Optical observations
  35. GRB030329: further optical photometry and evidence for a light curve discontinuity
  36. triangulation of GRB 030331 (single error box)
  37. GRB 030329: optical observations
  38. GRB 030329, optical spectroscopy
  39. Photometry of GRB030329 - Constant OT Magnitude
  40. GRB030329 - OT brightens
  41. GRB030329 15 GHz radio observation
  42. GRB 030329, optical photometry
  43. GRB 030324: Optical and NIR Observations
  44. GRB030329 - Light curve flattening
  45. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  46. GRB030329a: detection by Konus-Wind
  47. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  48. GRB 030329: Optical decay and synthesis
  49. GRB030328: X-ray Afterglow Observed with Chandra
  50. GRB 030329: OT B and R photometry, decline rate
  51. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  52. GRB030328: optical spectroscopy at TNG
  53. GRB030328: optical photometry at the TNG
  54. VLT spectra of GRB 030328
  55. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  56. Possible GRB030323 localized by INTEGRAL
  57. IPN triangulation of GRB030326 (single small error box)
  58. IPN triangulation of GRB030325 (two small error boxes)
  59. GRB030323: V, R, I photometry
  60. GRB030324, Optical Observations
  61. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  62. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  63. VLT/FORS2 spectra of GRB 030323
  64. IPN triangulation of GRB030320 (small error box)
  65. IPN upper limit to a GRB associated with SN2003L
  66. IPN triangulation of GRB030306 (single small error box - REVISED)
  67. IPN triangulation of GRB030306 (single small error box)
  68. IPN triangulation of GRB030306 (two small error boxes)
  69. IPN triangulation of GRB030304 (annulus)
  70. GRB030226, BVRc observations
  71. GRB 030228, optical observations
  72. GRB 030227: Confirmed Optical Afterglow (S1-A)
  73. GRB 030227, possible optical counterpart of XMM-Newton source
  74. GRB030227 - faint tentative OT candidate
  75. GRB 030226, optical observations
  76. XMM-Newton observation of GRB030227
  77. GRB 030226, optical light curve
  78. GRB 030226 : Predicted light curve
  79. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  80. GRB 030226 simultaneous optical observations
  81. GRB 030226, optical observations
  82. GRB 030226 Optical Spectra and R,I,z' Imaging
  83. GRB: Non-Referencing of GCN Circulars.
  84. IPN triangulation of GRB030217 (small error box)
  85. GRB 030204: Optical Observations
  86. GRB030131: Candidate Optical Afterglow
  87. GRB 030204, optical observations
  88. IPN triangulation of GRB030204 (small error box)
  89. GRB 030131, optical observations
  90. GRB 030131: afterglow candidate
  91. GRB030131: corrected INTEGRAL position
  92. IPN triangulation of GRB030131
  93. GRB030131: refined position
  94. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  95. GRB 030115, simultaneous observations by BOOTES-1
  96. IPN triangulation of GRB030115C (large error box)
  97. GRB 021211: R-band observations at late-time
  98. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  99. GRB 030115: APO Optical Observations
  100. Information about where HETE will be pointing

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