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"

35958 results found.

  1. GRB030329 observed as a sudden ionospheric disturbance (SID)
  2. IPN triangulation of GRB030426 (annulus)
  3. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  4. IPN triangulation of GRB030425 (single error box)
  5. GRB 030329, the review of the sky area in plate archive (1950-1998)
  6. GRB 030329: Spectral Evolution of SN 2003dh
  7. Optical Observations of GRB 030418 with Magellan
  8. GRB 030329: optical spectropolarimetry at VLT
  9. IPN triangulation of GRB030422C (annulus)
  10. IPN triangulation of GRB030422B (annulus)
  11. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  12. GRB030329: optical polarization
  13. IPN triangulation of GRB030422 (two large error boxes)
  14. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  15. IPN triangulation of GRB030421 (annulus)
  16. MASTER:optical observations GRB030418
  17. MASTER:optical observations probable GRB030414
  18. GRB030329: 444 AAVSO Measurements
  19. IPN triangulation of GRB030419 (annulus)
  20. MASTER:optical observations GRB030416
  21. ROTSE-III prompt optical detections of GRB 030418
  22. GRB030418: Upper limits from recent and historical observations.
  23. GRB030418: Kiso near infrared observations
  24. GRB 030418: Optical afterglow
  25. GRB 030418: Finder for afterglow candidate
  26. GRB 030418: Optical afterglow candidate
  27. GRB 030329 OT position
  28. OT GRB 030329: early UBVRcIc spectral evolution
  29. GRB030329, UBVRI polarimetry, R-polarization
  30. GRB 030329: SARA Optical Observations
  31. OT GRB 030329: early spectrum
  32. GRB030329: VR Photometry at TNG
  33. GRB030324: Candidate Optical Afterglow (Erratum)
  34. GRB030324: Candidate Optical Afterglow
  35. IPN triangulation of GRB030414 (small error box)
  36. GRB 030413: Optical Observations
  37. GRB 030329 Rc observations
  38. IPN triangulation of GRB030413 (small error box)
  39. IPN triangulation of GRB030410 (annulus)
  40. Superluminal motion in GRB 030329 (Correction)
  41. Superluminal motion in GRB 030329
  42. GRB 030329 and SN 2003dh
  43. GRB030329, optical position
  44. GRB 030329 VLBA Observations
  45. IPN triangulation of GRB030406 (small error box)
  46. IPN triangulation of GRB050403 (small error box)
  47. IPN triangulation of GRB030403 (annulus)
  48. GRB 030329: BVRI photometry at Asiago
  49. GRB 030329, light curve flattens
  50. GRB 030329: VLT V-band photometry
  51. If the SN/GRB connection confirmed
  52. GRB 030329: Supernova Confirmed
  53. GRB030329: RTT150 optical observations
  54. GRB030329: Near Infrared Observations at Gunma
  55. GRB030329: HET spectroscopic monitoring
  56. Kiso observation of the GRB030329 at April 6
  57. GRB 030329, color evolution
  58. GRB030328, UBVRcIc field photometry
  59. GRB 030329 Optical observations
  60. GRB 030329, color evolution
  61. GRB 030329: possible color change
  62. GRB030329: RTT150 optical observations
  63. GRB 030329: Supernova Spectrum Emerging
  64. GRB030329: Kiso B and R band observations
  65. GRB030329: RTT150 optical observation
  66. GRB030329: More AAVSO VR obs
  67. GRB030328: R upper limit after 6 hours by MASTER
  68. GRB 030329: BV photographic observations
  69. GRB 030329: SARA Optical Observations
  70. GRB 030329: SARA Optical Observations
  71. GRB030329, fading resumes
  72. GRB 030329, BVRI photometry
  73. SDSS 0.5m PT observations of GRB030329 (correction)
  74. SDSS 0.5m PT observations of GRB030329
  75. GRB 030329, Optical observations
  76. GRB 030329, nearby galaxies
  77. GRB030329, cessation of fading
  78. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  79. GRB 030329: Sub-millimeter detection
  80. GRB 030329: SARA Optical Observations
  81. GRB 030329: SARA Optical Observations
  82. OT GRB light curves and SN predictions
  83. GRB030329, optical observation
  84. GRB030329, new UBVRcIc field photometry
  85. GRB 030329, light curve and SN prediction
  86. GRB030329: optical observations at Tokyo Tech
  87. GRB 030329: optical observations
  88. GRB030329: multiple re-brightening phases
  89. GRB 030329, BRI photometry
  90. GRB 030329 , SPM optical observations
  91. GRB 030329: Radio observations at GMRT
  92. Further AAVSO V,B,R observations of GRB030329
  93. GRB 030329: Additional Mt. Laguna Optical Observations
  94. GRB 030329: SARA Optical Observations
  95. GRB 030329: Observations with ANDICAM
  96. GRB030329: further optical photometry and evidence for a light curve discontinuity
  97. GRB 030329: Correction to GCN 2056
  98. GRB 030329: fitting parameters and re-brightening
  99. GRB 030329: KAIT optical photometry
  100. GRB030329 Further RBO 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