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"

35946 results found.

  1. GRB030329 -- RATAN-600 data in April-May
  2. Final IPN error ellipse for GRB021206 (the polarized GRB)
  3. GRB 021206, Radio afterglow candidate
  4. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  5. IPN triangulation of GRB030607 (annulus)
  6. IPN triangulation of GRB030606 (two alternate error boxes)
  7. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  8. IPN triangulation of GRB030605B (annulus)
  9. GRB 030528: Optical Observations
  10. IPN triangulation of GRB030605 (annulus)
  11. GRB 030528: tentative NIR counterpart
  12. GRB 030528, radio observations
  13. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  14. GRB030329, further radio observations at GMRT
  15. GRB030528, BVRI field photometry
  16. IPN triangulation of GRB030601 (annulus)
  17. GRB030528: Chandra TOO Planned
  18. GRB 030519B: optical observations.
  19. GRB 030329: optical observations
  20. GRB 030329/SN 2003dh: Jitter Episode
  21. GRB 030528, Teramo optical observation
  22. GRB 030528 Bisei optical observation
  23. GRB030528 (H2724): A long GRB localized by HETE
  24. GRB 030329: Correction to GCN 2254
  25. GRB 030329: Optical Observations
  26. GRB 030528: Optical observations at RIKEN
  27. GRB 030528 (=H2724) Kyoto optical observation
  28. IPN triangulation of GRB030523B (annulus)
  29. GRB 030416: Optical Observations
  30. GRB 030329: Planned XMM-Newton Observation
  31. IPN triangulation of GRB030523 (annulus)
  32. GRB 030329: optical photometry at various french observatories
  33. GRB 030329: optical photometry at Belesta observatory (France)
  34. GRB 030329/SN 2003dh: Possible increase in brightness
  35. GRB 030329: HST ACS Observations of the Host
  36. GRB 030329 Optical Observations
  37. GRB 021004: HST observations
  38. GRB030324: Further Observations of the Candidate Optical Afterglow
  39. IPN triangulation of GRB030519B=H2716 (small error box)
  40. GRB 030418: Second Epoch Optical Observations with Magellan
  41. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  42. IPN triangulation of GRB030519 (annulus)
  43. IPN triangulation of GRB030518C (annulus)
  44. IPN triangulation of GRB030518B (annulus)
  45. IPN triangulation of GRB030518A (annulus)
  46. IPN triangulation of GRB030514 (annulus)
  47. IPN triangulation of GRB030513 (annulus)
  48. IPN triangulation of GRB030509B (annulus)
  49. GRB 030329: Optical limit (contemporaneous imaging)
  50. GRB 030501: final TAROT limits
  51. IPN triangulation of GRB030509 (small errror box)
  52. IPN triangulation of GRB030509 - correction
  53. IPN triangulation of GRB030509 (single error box)
  54. GRB030329: RTT150 optical observations
  55. GRB 030329: Optical limit (contemporaneous photography)
  56. GRB030418, BVRcIc field photometry
  57. GRB 030429: Redshift of neighbor galaxy
  58. GRB030429, BVRcIc field photometry
  59. GRB 030329: High-Resolution Spectroscopy of the Host
  60. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  61. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  62. GRB030429: RTT150 optical observations, a possible host galaxy
  63. IPN triangulation of GRB030506 (annulus)
  64. IPN triangulation of GRB030505B (large error box)
  65. IPN triangulation of GRB030505A (annulus)
  66. GRB030329: RTT150 optical observations and upper limit for a host
  67. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  68. GRB030501, optical observation
  69. GRB030501C triangulation (annulus)
  70. GRB030329: RTT150 optical observations and upper limit for a host
  71. GRB 030429: Radio Observations
  72. GRB 030429: redshift from VLT spectroscopy
  73. GRB 030429: IR photometry with IRSF/SIRIUS
  74. GRB030501B triangulation (single error box)
  75. GRB 030329 Optical Observations
  76. GRB 030329, BVRI photometry
  77. GRB 030501: TAROT possible candidate counterpart
  78. IPN triangulation of GRB030501 (IBIS event; annulus)
  79. IPN triangulation of GRB030501B (annulus)
  80. GRB 030429: confirmation of afterglow candidate
  81. GRB030429, possible optical counterpart
  82. GRB030501 localized by INTEGRAL
  83. GRB030425: CrAO optical observation
  84. IPN triangulation of GRB030429 (annulus)
  85. IPN triangulation of GRB030428 (two large error boxes)
  86. GRB 030329 Oprical observations in Rozhen observatory
  87. GRB 030429: ROTSE-III observations
  88. GRB 030324: Radio Observations
  89. GRB030329 observed as a sudden ionospheric disturbance (SID)
  90. IPN triangulation of GRB030426 (annulus)
  91. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  92. IPN triangulation of GRB030425 (single error box)
  93. GRB 030329, the review of the sky area in plate archive (1950-1998)
  94. GRB 030329: Spectral Evolution of SN 2003dh
  95. Optical Observations of GRB 030418 with Magellan
  96. GRB 030329: optical spectropolarimetry at VLT
  97. IPN triangulation of GRB030422C (annulus)
  98. IPN triangulation of GRB030422B (annulus)
  99. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  100. GRB030329: optical polarization

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