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"

36145 results found.

  1. IPN triangulation of GRB030606 (two alternate error boxes)
  2. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  3. IPN triangulation of GRB030605B (annulus)
  4. GRB 030528: Optical Observations
  5. IPN triangulation of GRB030605 (annulus)
  6. GRB 030528: tentative NIR counterpart
  7. GRB 030528, radio observations
  8. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  9. GRB030329, further radio observations at GMRT
  10. GRB030528, BVRI field photometry
  11. IPN triangulation of GRB030601 (annulus)
  12. GRB030528: Chandra TOO Planned
  13. GRB 030519B: optical observations.
  14. GRB 030329: optical observations
  15. GRB 030329/SN 2003dh: Jitter Episode
  16. GRB 030528, Teramo optical observation
  17. GRB 030528 Bisei optical observation
  18. GRB030528 (H2724): A long GRB localized by HETE
  19. GRB 030329: Correction to GCN 2254
  20. GRB 030329: Optical Observations
  21. GRB 030528: Optical observations at RIKEN
  22. GRB 030528 (=H2724) Kyoto optical observation
  23. IPN triangulation of GRB030523B (annulus)
  24. GRB 030416: Optical Observations
  25. GRB 030329: Planned XMM-Newton Observation
  26. IPN triangulation of GRB030523 (annulus)
  27. GRB 030329: optical photometry at various french observatories
  28. GRB 030329: optical photometry at Belesta observatory (France)
  29. GRB 030329/SN 2003dh: Possible increase in brightness
  30. GRB 030329: HST ACS Observations of the Host
  31. GRB 030329 Optical Observations
  32. GRB 021004: HST observations
  33. GRB030324: Further Observations of the Candidate Optical Afterglow
  34. IPN triangulation of GRB030519B=H2716 (small error box)
  35. GRB 030418: Second Epoch Optical Observations with Magellan
  36. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  37. IPN triangulation of GRB030519 (annulus)
  38. IPN triangulation of GRB030518C (annulus)
  39. IPN triangulation of GRB030518B (annulus)
  40. IPN triangulation of GRB030518A (annulus)
  41. IPN triangulation of GRB030514 (annulus)
  42. IPN triangulation of GRB030513 (annulus)
  43. IPN triangulation of GRB030509B (annulus)
  44. GRB 030329: Optical limit (contemporaneous imaging)
  45. GRB 030501: final TAROT limits
  46. IPN triangulation of GRB030509 (small errror box)
  47. IPN triangulation of GRB030509 - correction
  48. IPN triangulation of GRB030509 (single error box)
  49. GRB030329: RTT150 optical observations
  50. GRB 030329: Optical limit (contemporaneous photography)
  51. GRB030418, BVRcIc field photometry
  52. GRB 030429: Redshift of neighbor galaxy
  53. GRB030429, BVRcIc field photometry
  54. GRB 030329: High-Resolution Spectroscopy of the Host
  55. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  56. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  57. GRB030429: RTT150 optical observations, a possible host galaxy
  58. IPN triangulation of GRB030506 (annulus)
  59. IPN triangulation of GRB030505B (large error box)
  60. IPN triangulation of GRB030505A (annulus)
  61. GRB030329: RTT150 optical observations and upper limit for a host
  62. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  63. GRB030501, optical observation
  64. GRB030501C triangulation (annulus)
  65. GRB030329: RTT150 optical observations and upper limit for a host
  66. GRB 030429: Radio Observations
  67. GRB 030429: redshift from VLT spectroscopy
  68. GRB 030429: IR photometry with IRSF/SIRIUS
  69. GRB030501B triangulation (single error box)
  70. GRB 030329 Optical Observations
  71. GRB 030329, BVRI photometry
  72. GRB 030501: TAROT possible candidate counterpart
  73. IPN triangulation of GRB030501 (IBIS event; annulus)
  74. IPN triangulation of GRB030501B (annulus)
  75. GRB 030429: confirmation of afterglow candidate
  76. GRB030429, possible optical counterpart
  77. GRB030501 localized by INTEGRAL
  78. GRB030425: CrAO optical observation
  79. IPN triangulation of GRB030429 (annulus)
  80. IPN triangulation of GRB030428 (two large error boxes)
  81. GRB 030329 Oprical observations in Rozhen observatory
  82. GRB 030429: ROTSE-III observations
  83. GRB 030324: Radio Observations
  84. GRB030329 observed as a sudden ionospheric disturbance (SID)
  85. IPN triangulation of GRB030426 (annulus)
  86. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  87. IPN triangulation of GRB030425 (single error box)
  88. GRB 030329, the review of the sky area in plate archive (1950-1998)
  89. GRB 030329: Spectral Evolution of SN 2003dh
  90. Optical Observations of GRB 030418 with Magellan
  91. GRB 030329: optical spectropolarimetry at VLT
  92. IPN triangulation of GRB030422C (annulus)
  93. IPN triangulation of GRB030422B (annulus)
  94. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  95. GRB030329: optical polarization
  96. IPN triangulation of GRB030422 (two large error boxes)
  97. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  98. IPN triangulation of GRB030421 (annulus)
  99. MASTER:optical observations GRB030418
  100. MASTER:optical observations probable GRB030414

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