Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

27398 results found.

  1. GRB 030528 (=H2724) Kyoto optical observation
  2. GRB 030416: Optical Observations
  3. GRB 030329 Optical Observations
  4. GRB030329: XMM-Newton observation
  5. GRB 021004: HST observations
  6. GRB030324: Further Observations of the Candidate Optical Afterglow
  7. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  8. IPN triangulation of GRB030519B=H2716 (small error box)
  9. HETE GRB030329, correction to Rc Observations in Loiano
  10. GRB 030329: Optical limit (contemporaneous imaging)
  11. IPN triangulation of GRB030509 (small errror box)
  12. GRB030329, BVRI photometry
  13. GRB030429, refiend optical brightness
  14. GRB 030329: Optical limit (contemporaneous photography)
  15. GRB030418, BVRcIc field photometry
  16. GRB030429, BVRcIc field photometry
  17. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  18. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  19. GRB030329: RTT150 optical observations and upper limit for a host
  20. GRB030501, optical observation
  21. GRB030501 triangulation (correction to GCN 2194)
  22. GRB030329: RTT150 optical observations and upper limit for a host
  23. GRB 030429: redshift from VLT spectroscopy
  24. GRB030501B triangulation (single error box)
  25. GRB 030329, BVRI photometry
  26. GRB030429: Optical Observations
  27. GRB030501: TAROT candidate afterglow present in archival images
  28. GRB 030429: confirmation of afterglow candidate
  29. GRB 030329 Oprical observations in Rozhen observatory
  30. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  31. IPN triangulation of GRB030425 (single error box)
  32. GRB 030329, the review of the sky area in plate archive (1950-1998)
  33. GRB 030329: optical spectropolarimetry at VLT
  34. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  35. GRB030329: optical polarization
  36. IPN triangulation of GRB030422 (two large error boxes)
  37. GRB030329, optical observation
  38. MASTER:optical observations GRB030418
  39. MASTER:optical observations probable GRB030414
  40. GRB030418: Kiso near infrared observations
  41. GRB 030418: Optical afterglow
  42. OT GRB 030329: early UBVRcIc spectral evolution
  43. OT GRB 030329: early spectrum
  44. IPN triangulation of GRB030414 (small error box)
  45. IPN triangulation of GRB030413 (small error box)
  46. Superluminal motion in GRB 030329 (Correction)
  47. Superluminal motion in GRB 030329
  48. GRB030329, optical position
  49. IPN triangulation of GRB030406 (small error box)
  50. IPN triangulation of GRB050403 (small error box)
  51. GRB 030329: BVRI photometry at Asiago
  52. GRB 030329: VLT V-band photometry
  53. Kiso observation of the GRB030329 at April 6
  54. GRB 030329, color evolution
  55. GRB030328, UBVRcIc field photometry
  56. GRB 030329 Optical observations
  57. GRB030329: Kiso B and R band observations
  58. GRB030328: R upper limit after 6 hours by MASTER
  59. SDSS 0.5m PT observations of GRB030329 (correction)
  60. SDSS 0.5m PT observations of GRB030329
  61. GRB030329: final R-band light curve by MASTER
  62. GRB030329, optical observation
  63. GRB030329, new UBVRcIc field photometry
  64. GRB 030329, light curve and SN prediction
  65. GRB 030329, BRI photometry
  66. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  67. GRB030329: Optical observations at Teramo
  68. GRB 030329: Radio observations at GMRT
  69. Further AAVSO V,B,R observations of GRB030329
  70. GRB 030329: Additional Mt. Laguna Optical Observations
  71. GRB 030329: Observations with ANDICAM
  72. GRB030329: further optical photometry and evidence for a light curve discontinuity
  73. triangulation of GRB 030331 (single error box)
  74. GRB 030329: optical observations
  75. Photometry of GRB030329 - Constant OT Magnitude
  76. GRB030329 - OT brightens
  77. GRB 030329, optical photometry
  78. GRB 030324: Optical and NIR Observations
  79. GRB030329: R band light curve by MASTER
  80. GRB030329 - Light curve flattening
  81. GRB 030324, optical search
  82. GRB 030329, optical observations
  83. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  84. GRB030329a: detection by Konus-Wind
  85. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  86. GRB030329, BVRcIc field photometry
  87. GRB030329, SPM optical observations
  88. GRB 030329: Optical decay and synthesis
  89. GRB030329 optical observations
  90. GRB 030329: Optical pre-Imaging
  91. GRB 030329: Upper limit from 5.6 hours before trigger
  92. GRB030328: X-ray Afterglow Observed with Chandra
  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. GRB 030329: Optical Afterglow Observations
  98. GRB 030328: optical observations
  99. GRB 030329: Optical afterglow fading
  100. GRB 030328: OT photometry

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