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"

36180 results found.

  1. GRB 030429: Radio Observations
  2. GRB 030429: redshift from VLT spectroscopy
  3. GRB 030429: IR photometry with IRSF/SIRIUS
  4. GRB030501B triangulation (single error box)
  5. GRB 030329 Optical Observations
  6. GRB 030329, BVRI photometry
  7. GRB 030501: TAROT possible candidate counterpart
  8. IPN triangulation of GRB030501 (IBIS event; annulus)
  9. IPN triangulation of GRB030501B (annulus)
  10. GRB 030429: confirmation of afterglow candidate
  11. GRB030429, possible optical counterpart
  12. GRB030501 localized by INTEGRAL
  13. GRB030425: CrAO optical observation
  14. IPN triangulation of GRB030429 (annulus)
  15. IPN triangulation of GRB030428 (two large error boxes)
  16. GRB 030329 Oprical observations in Rozhen observatory
  17. GRB 030429: ROTSE-III observations
  18. GRB 030324: Radio Observations
  19. GRB030329 observed as a sudden ionospheric disturbance (SID)
  20. IPN triangulation of GRB030426 (annulus)
  21. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  22. IPN triangulation of GRB030425 (single error box)
  23. GRB 030329, the review of the sky area in plate archive (1950-1998)
  24. GRB 030329: Spectral Evolution of SN 2003dh
  25. Optical Observations of GRB 030418 with Magellan
  26. GRB 030329: optical spectropolarimetry at VLT
  27. IPN triangulation of GRB030422C (annulus)
  28. IPN triangulation of GRB030422B (annulus)
  29. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  30. GRB030329: optical polarization
  31. IPN triangulation of GRB030422 (two large error boxes)
  32. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  33. IPN triangulation of GRB030421 (annulus)
  34. MASTER:optical observations GRB030418
  35. MASTER:optical observations probable GRB030414
  36. GRB030329: 444 AAVSO Measurements
  37. IPN triangulation of GRB030419 (annulus)
  38. MASTER:optical observations GRB030416
  39. ROTSE-III prompt optical detections of GRB 030418
  40. GRB030418: Upper limits from recent and historical observations.
  41. GRB030418: Kiso near infrared observations
  42. GRB 030418: Optical afterglow
  43. GRB 030418: Finder for afterglow candidate
  44. GRB 030418: Optical afterglow candidate
  45. GRB 030329 OT position
  46. OT GRB 030329: early UBVRcIc spectral evolution
  47. GRB030329, UBVRI polarimetry, R-polarization
  48. GRB 030329: SARA Optical Observations
  49. OT GRB 030329: early spectrum
  50. GRB030329: VR Photometry at TNG
  51. GRB030324: Candidate Optical Afterglow (Erratum)
  52. GRB030324: Candidate Optical Afterglow
  53. IPN triangulation of GRB030414 (small error box)
  54. GRB 030413: Optical Observations
  55. GRB 030329 Rc observations
  56. IPN triangulation of GRB030413 (small error box)
  57. IPN triangulation of GRB030410 (annulus)
  58. Superluminal motion in GRB 030329 (Correction)
  59. Superluminal motion in GRB 030329
  60. GRB 030329 and SN 2003dh
  61. GRB030329, optical position
  62. GRB 030329 VLBA Observations
  63. IPN triangulation of GRB030406 (small error box)
  64. IPN triangulation of GRB050403 (small error box)
  65. IPN triangulation of GRB030403 (annulus)
  66. GRB 030329: BVRI photometry at Asiago
  67. GRB 030329, light curve flattens
  68. GRB 030329: VLT V-band photometry
  69. If the SN/GRB connection confirmed
  70. GRB 030329: Supernova Confirmed
  71. GRB030329: RTT150 optical observations
  72. GRB030329: Near Infrared Observations at Gunma
  73. GRB030329: HET spectroscopic monitoring
  74. Kiso observation of the GRB030329 at April 6
  75. GRB 030329, color evolution
  76. GRB030328, UBVRcIc field photometry
  77. GRB 030329 Optical observations
  78. GRB 030329, color evolution
  79. GRB 030329: possible color change
  80. GRB030329: RTT150 optical observations
  81. GRB 030329: Supernova Spectrum Emerging
  82. GRB030329: Kiso B and R band observations
  83. GRB030329: RTT150 optical observation
  84. GRB030329: More AAVSO VR obs
  85. GRB030328: R upper limit after 6 hours by MASTER
  86. GRB 030329: BV photographic observations
  87. GRB 030329: SARA Optical Observations
  88. GRB 030329: SARA Optical Observations
  89. GRB030329, fading resumes
  90. GRB 030329, BVRI photometry
  91. SDSS 0.5m PT observations of GRB030329 (correction)
  92. SDSS 0.5m PT observations of GRB030329
  93. GRB 030329, Optical observations
  94. GRB 030329, nearby galaxies
  95. GRB030329, cessation of fading
  96. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  97. GRB 030329: Sub-millimeter detection
  98. GRB 030329: SARA Optical Observations
  99. GRB 030329: SARA Optical Observations
  100. OT GRB light curves and SN predictions

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