Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26368 results found.

  1. IPN triangulation of GRB030425 (single error box)
  2. GRB 030329, the review of the sky area in plate archive (1950-1998)
  3. GRB 030329: optical spectropolarimetry at VLT
  4. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  5. GRB030329: optical polarization
  6. IPN triangulation of GRB030422 (two large error boxes)
  7. GRB030329, optical observation
  8. MASTER:optical observations GRB030418
  9. MASTER:optical observations probable GRB030414
  10. GRB030418: Kiso near infrared observations
  11. GRB 030418: Optical afterglow
  12. OT GRB 030329: early UBVRcIc spectral evolution
  13. OT GRB 030329: early spectrum
  14. IPN triangulation of GRB030414 (small error box)
  15. IPN triangulation of GRB030413 (small error box)
  16. Superluminal motion in GRB 030329 (Correction)
  17. Superluminal motion in GRB 030329
  18. GRB030329, optical position
  19. IPN triangulation of GRB030406 (small error box)
  20. IPN triangulation of GRB050403 (small error box)
  21. GRB 030329: BVRI photometry at Asiago
  22. GRB 030329: VLT V-band photometry
  23. Kiso observation of the GRB030329 at April 6
  24. GRB 030329, color evolution
  25. GRB030328, UBVRcIc field photometry
  26. GRB 030329 Optical observations
  27. GRB030329: Kiso B and R band observations
  28. GRB030328: R upper limit after 6 hours by MASTER
  29. SDSS 0.5m PT observations of GRB030329 (correction)
  30. SDSS 0.5m PT observations of GRB030329
  31. GRB030329: final R-band light curve by MASTER
  32. GRB030329, optical observation
  33. GRB030329, new UBVRcIc field photometry
  34. GRB 030329, light curve and SN prediction
  35. GRB 030329, BRI photometry
  36. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  37. GRB030329: Optical observations at Teramo
  38. GRB 030329: Radio observations at GMRT
  39. Further AAVSO V,B,R observations of GRB030329
  40. GRB 030329: Additional Mt. Laguna Optical Observations
  41. GRB 030329: Observations with ANDICAM
  42. GRB030329: further optical photometry and evidence for a light curve discontinuity
  43. triangulation of GRB 030331 (single error box)
  44. GRB 030329: optical observations
  45. Photometry of GRB030329 - Constant OT Magnitude
  46. GRB030329 - OT brightens
  47. GRB 030329, optical photometry
  48. GRB 030324: Optical and NIR Observations
  49. GRB030329: R band light curve by MASTER
  50. GRB030329 - Light curve flattening
  51. GRB 030324, optical search
  52. GRB 030329, optical observations
  53. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  54. GRB030329a: detection by Konus-Wind
  55. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  56. GRB030329, BVRcIc field photometry
  57. GRB030329, SPM optical observations
  58. GRB 030329: Optical decay and synthesis
  59. GRB030329 optical observations
  60. GRB 030329: Optical pre-Imaging
  61. GRB 030329: Upper limit from 5.6 hours before trigger
  62. GRB030328: X-ray Afterglow Observed with Chandra
  63. GRB 030329, R-band observations
  64. GRB 030329: OT B and R photometry, decline rate
  65. GRB030329: Upper limits from recent and historical observations.
  66. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  67. GRB 030329: Optical Afterglow Observations
  68. GRB 030328: optical observations
  69. GRB 030329: Optical afterglow fading
  70. GRB 030328: OT photometry
  71. GRB030328: optical spectroscopy at TNG
  72. GRB030328: optical photometry at the TNG
  73. VLT spectra of GRB 030328
  74. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  75. GRB 030328: Optical observations
  76. GRB030324 optical observation
  77. GRB030131, BVRcIc field photometry
  78. Possible GRB030323 localized by INTEGRAL
  79. GRB030323: Detection on 2003/03/24
  80. IPN triangulation of GRB030326 (single small error box)
  81. IPN triangulation of GRB030325 (two small error boxes)
  82. GRB030323: V, R, I photometry
  83. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  84. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  85. VLT/FORS2 spectra of GRB 030323
  86. GRB030323, optical observations
  87. GRB030324, BVRcIc field photometry
  88. GRB030323, BVRcIc field calibration
  89. IPN triangulation of GRB030320 (small error box)
  90. Possible GRB 030320 localized by INTEGRAL
  91. IPN triangulation of GRB030306 (single small error box - REVISED)
  92. IPN triangulation of GRB030306 (single small error box)
  93. IPN triangulation of GRB030306 (two small error boxes)
  94. GRB030226, BVRc observations
  95. Chandra detection of the X-ray afterglow of GRB 030226
  96. GRB030227: Kiso optical upper limit
  97. GRB030227, BVRcIc field photometry
  98. GRB030226, BVRcIc field calibration
  99. GRB 030228, optical observations
  100. GRB 030227: Confirmed Optical Afterglow (S1-A)

Advanced

Download all Circulars as a .tar.gz archive:
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