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"

37150 results found.

  1. GRB030329: Kiso B and R band observations
  2. GRB030329: RTT150 optical observation
  3. GRB030329: More AAVSO VR obs
  4. GRB030328: R upper limit after 6 hours by MASTER
  5. GRB 030329: BV photographic observations
  6. GRB 030329: SARA Optical Observations
  7. GRB 030329: SARA Optical Observations
  8. GRB030329, fading resumes
  9. GRB 030329, BVRI photometry
  10. SDSS 0.5m PT observations of GRB030329 (correction)
  11. SDSS 0.5m PT observations of GRB030329
  12. GRB 030329, Optical observations
  13. GRB 030329, nearby galaxies
  14. GRB030329, cessation of fading
  15. GRB030329: final R-band light curve by MASTER
  16. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  17. GRB 030329: Sub-millimeter detection
  18. GRB 030329: SARA Optical Observations
  19. GRB 030329: SARA Optical Observations
  20. OT GRB light curves and SN predictions
  21. GRB030329, optical observation
  22. GRB030329, new UBVRcIc field photometry
  23. GRB 030329, light curve and SN prediction
  24. GRB030329: optical observations at Tokyo Tech
  25. GRB 030329: optical observations
  26. GRB030329: multiple re-brightening phases
  27. GRB 030329, BRI photometry
  28. GRB 030329 , SPM optical observations
  29. GRB 030329: Radio observations at GMRT
  30. Further AAVSO V,B,R observations of GRB030329
  31. GRB 030329: Additional Mt. Laguna Optical Observations
  32. GRB 030329: SARA Optical Observations
  33. GRB 030329: Observations with ANDICAM
  34. GRB030329: further optical photometry and evidence for a light curve discontinuity
  35. GRB 030329: Correction to GCN 2056
  36. GRB 030329: fitting parameters and re-brightening
  37. GRB 030329: KAIT optical photometry
  38. GRB030329 Further RBO Optical Observations
  39. triangulation of GRB 030331 (single error box)
  40. GRB030329 - OT rebrightens
  41. GRB 030329: SARA Optical Observations
  42. AAVSO V & R observations of GRB030329
  43. IPN triangulation of GRB030331 (annulus)
  44. GRB 030329: optical observations
  45. IPN triangulation of GRB030329b (large error box)
  46. GRB 030329: beginning of the new fading phase in optical band
  47. GRB 030329, optical spectroscopy
  48. GRB 030329: fading X-ray afterglow with RXTE
  49. GRB 030329: optical photometry
  50. Photometry of GRB030329 - Constant OT Magnitude
  51. GRB 030329, R-band observations
  52. GRB 030329, R-band light curve
  53. GRB 030329: further optical observations
  54. GRB030329 - OT brightens
  55. GRB 030329: OT observations at Kanazawa
  56. GRB030329 15 GHz radio observation
  57. GRB 030329 RBO V Optical Observations
  58. GRB 030329, optical photometry
  59. GRB030329: Near Infrared Observations
  60. 030331 NOT A GRB
  61. INTEGRAL GRB 030331
  62. GRB 030324: Optical and NIR Observations
  63. GRB 030328, optical photometry
  64. GRB030329: R band light curve by MASTER
  65. GRB030329 - Light curve flattening
  66. GRB 030329: SARA Optical Observations
  67. GRB 030324, optical search
  68. GRB030329 - near contemporaneous optical limits from CONCAM
  69. GRB 030329, optical observations
  70. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  71. GRB 030329: Light curve observed during the change of its slope.
  72. GRB030329, BVRcIc field photometry
  73. GRB030329, SPM optical observations
  74. GRB 030329: Optical Decay
  75. Redshift of GRB 030329
  76. GRB030329: ROTSE network observes steepening of decay curve
  77. GRB 030329, optical photometry
  78. GRB 030329: Optical decay and synthesis
  79. GRB030329: optical spectroscopy with the TNG
  80. GRB 030329: Radio Observations
  81. GRB 030329, optical spectroscopy
  82. GRB 030329: still bright
  83. GRB 030329: Optical pre-Imaging
  84. GRB 030329: visual observations
  85. GRB 030329: Upper limit from 5.6 hours before trigger
  86. GRB030328: R optical observation
  87. GRB030328: X-ray Afterglow Observed with Chandra
  88. GRB 030323: Gemini South VRI obsevations.
  89. GRB030329: Optical observations
  90. GRB 030329, R-band observations, supplement
  91. GRB030329:optical observations by MASTER
  92. GRB 030329: optical observations
  93. GRB 030329, R-band observations
  94. GRB 030329: OT B and R photometry, decline rate
  95. GRB030329: Upper limits from recent and historical observations.
  96. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  97. RXTE detection of GRB 030329 afterglow
  98. GRB 030329: Optical Afterglow Observations
  99. GRB 030329: precise position from Kyoto images
  100. GRB 030328 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