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"

35952 results found.

  1. Optical Observations of GRB 030418 with Magellan
  2. GRB 030329: optical spectropolarimetry at VLT
  3. IPN triangulation of GRB030422C (annulus)
  4. IPN triangulation of GRB030422B (annulus)
  5. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  6. GRB030329: optical polarization
  7. IPN triangulation of GRB030422 (two large error boxes)
  8. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  9. IPN triangulation of GRB030421 (annulus)
  10. MASTER:optical observations GRB030418
  11. MASTER:optical observations probable GRB030414
  12. GRB030329: 444 AAVSO Measurements
  13. IPN triangulation of GRB030419 (annulus)
  14. MASTER:optical observations GRB030416
  15. ROTSE-III prompt optical detections of GRB 030418
  16. GRB030418: Upper limits from recent and historical observations.
  17. GRB030418: Kiso near infrared observations
  18. GRB 030418: Optical afterglow
  19. GRB 030418: Finder for afterglow candidate
  20. GRB 030418: Optical afterglow candidate
  21. GRB 030329 OT position
  22. OT GRB 030329: early UBVRcIc spectral evolution
  23. GRB030329, UBVRI polarimetry, R-polarization
  24. GRB 030329: SARA Optical Observations
  25. OT GRB 030329: early spectrum
  26. GRB030329: VR Photometry at TNG
  27. GRB030324: Candidate Optical Afterglow (Erratum)
  28. GRB030324: Candidate Optical Afterglow
  29. IPN triangulation of GRB030414 (small error box)
  30. GRB 030413: Optical Observations
  31. GRB 030329 Rc observations
  32. IPN triangulation of GRB030413 (small error box)
  33. IPN triangulation of GRB030410 (annulus)
  34. Superluminal motion in GRB 030329 (Correction)
  35. Superluminal motion in GRB 030329
  36. GRB 030329 and SN 2003dh
  37. GRB030329, optical position
  38. GRB 030329 VLBA Observations
  39. IPN triangulation of GRB030406 (small error box)
  40. IPN triangulation of GRB050403 (small error box)
  41. IPN triangulation of GRB030403 (annulus)
  42. GRB 030329: BVRI photometry at Asiago
  43. GRB 030329, light curve flattens
  44. GRB 030329: VLT V-band photometry
  45. If the SN/GRB connection confirmed
  46. GRB 030329: Supernova Confirmed
  47. GRB030329: RTT150 optical observations
  48. GRB030329: Near Infrared Observations at Gunma
  49. GRB030329: HET spectroscopic monitoring
  50. Kiso observation of the GRB030329 at April 6
  51. GRB 030329, color evolution
  52. GRB030328, UBVRcIc field photometry
  53. GRB 030329 Optical observations
  54. GRB 030329, color evolution
  55. GRB 030329: possible color change
  56. GRB030329: RTT150 optical observations
  57. GRB 030329: Supernova Spectrum Emerging
  58. GRB030329: Kiso B and R band observations
  59. GRB030329: RTT150 optical observation
  60. GRB030329: More AAVSO VR obs
  61. GRB030328: R upper limit after 6 hours by MASTER
  62. GRB 030329: BV photographic observations
  63. GRB 030329: SARA Optical Observations
  64. GRB 030329: SARA Optical Observations
  65. GRB030329, fading resumes
  66. GRB 030329, BVRI photometry
  67. SDSS 0.5m PT observations of GRB030329 (correction)
  68. SDSS 0.5m PT observations of GRB030329
  69. GRB 030329, Optical observations
  70. GRB 030329, nearby galaxies
  71. GRB030329, cessation of fading
  72. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  73. GRB 030329: Sub-millimeter detection
  74. GRB 030329: SARA Optical Observations
  75. GRB 030329: SARA Optical Observations
  76. OT GRB light curves and SN predictions
  77. GRB030329, optical observation
  78. GRB030329, new UBVRcIc field photometry
  79. GRB 030329, light curve and SN prediction
  80. GRB030329: optical observations at Tokyo Tech
  81. GRB 030329: optical observations
  82. GRB030329: multiple re-brightening phases
  83. GRB 030329, BRI photometry
  84. GRB 030329 , SPM optical observations
  85. GRB 030329: Radio observations at GMRT
  86. Further AAVSO V,B,R observations of GRB030329
  87. GRB 030329: Additional Mt. Laguna Optical Observations
  88. GRB 030329: SARA Optical Observations
  89. GRB 030329: Observations with ANDICAM
  90. GRB030329: further optical photometry and evidence for a light curve discontinuity
  91. GRB 030329: Correction to GCN 2056
  92. GRB 030329: fitting parameters and re-brightening
  93. GRB 030329: KAIT optical photometry
  94. GRB030329 Further RBO Optical Observations
  95. triangulation of GRB 030331 (single error box)
  96. GRB030329 - OT rebrightens
  97. GRB 030329: SARA Optical Observations
  98. AAVSO V & R observations of GRB030329
  99. IPN triangulation of GRB030331 (annulus)
  100. GRB 030329: 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