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"

28049 results found.

  1. IPN triangulation of GRB030827 (large error box)
  2. GRB030823: optical observations
  3. GRB030823: optical observation at Tokyo Tech
  4. Lulin follow-up observations of GRB030823
  5. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  6. IPN detection of continued activity from SGR1806-20
  7. GRB 030817 = H2808 TAROT optical observations
  8. SGR 1808-20 (=H2802): A Possible new SGR
  9. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  10. XRF 030723: Detection of a rebrightening in the optical afterglow
  11. XRF030723, BVRcIc field photometry update
  12. IPN triangulation of GRB030801 (large error box)
  13. GRB021206 optical counterpart upper limit
  14. IPN triangulation of GRB030726 (large error box)
  15. IPN triangulation of GRB030721 (large error box)
  16. XRF030723 Radio Observations
  17. XRF 030723: confirmation of fading optical counterpart
  18. XRF030723(=H2777): Chandra Observations
  19. GRB030723: Upper limits from historical observations
  20. XRF030723: Palomar observations and proposed counterpart
  21. GRB030725 (=H2779): A Bright GRB Localized by HETE
  22. XRF030723 (= H2777): Chandra Observations Scheduled
  23. XRF030723, BVRcIc field photometry correction
  24. XRF030723, ROTSE-III Early Observations
  25. XRF030723, BVRcIc field photometry
  26. XRF 030723, optical observations
  27. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  28. Konus-Wind detection of the bursts from SGR1806-20 region
  29. SGR 1806-20, submm observations
  30. RXTE PCA Observations of SGR1806-20 Region
  31. IPN triangulation of GRB030714 (two large error boxes)
  32. IPN triangulation of GRB030715 (two large error boxes)
  33. GRB030706 triangulation (single large error box)
  34. GRB030329, optical observation in May
  35. IPN triangulation of GRB030626 (single large error box)
  36. IPN triangulation of GRB030626 (two large error boxes)
  37. GRB030329: second XMM-Newton observation
  38. GRB030329 -- RATAN-600 data in April-May
  39. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  40. IPN triangulation of GRB030606 (two alternate error boxes)
  41. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  42. GRB 030528: tentative NIR counterpart
  43. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  44. GRB030528, BVRI field photometry
  45. GRB030329, SPM optical observations
  46. GRB030528: Chandra TOO Planned
  47. GRB030528(=H2724): Revised SXC Localization
  48. GRB 030528 Bisei optical observation
  49. GRB030528 (H2724): A long GRB localized by HETE
  50. GRB 030329: Correction to GCN 2254
  51. GRB 030329: Optical Observations
  52. GRB 030528 (=H2724) Kyoto optical observation
  53. GRB 030416: Optical Observations
  54. GRB 030329 Optical Observations
  55. GRB030329: XMM-Newton observation
  56. GRB 021004: HST observations
  57. GRB030324: Further Observations of the Candidate Optical Afterglow
  58. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  59. IPN triangulation of GRB030519B=H2716 (small error box)
  60. HETE GRB030329, correction to Rc Observations in Loiano
  61. GRB 030329: Optical limit (contemporaneous imaging)
  62. IPN triangulation of GRB030509 (small errror box)
  63. GRB030329, BVRI photometry
  64. GRB030429, refiend optical brightness
  65. GRB 030329: Optical limit (contemporaneous photography)
  66. GRB030418, BVRcIc field photometry
  67. GRB030429, BVRcIc field photometry
  68. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  69. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  70. GRB030329: RTT150 optical observations and upper limit for a host
  71. GRB030501, optical observation
  72. GRB030501 triangulation (correction to GCN 2194)
  73. GRB030329: RTT150 optical observations and upper limit for a host
  74. GRB 030429: redshift from VLT spectroscopy
  75. GRB030501B triangulation (single error box)
  76. GRB 030329, BVRI photometry
  77. GRB030429: Optical Observations
  78. GRB030501: TAROT candidate afterglow present in archival images
  79. GRB 030429: confirmation of afterglow candidate
  80. GRB 030329 Oprical observations in Rozhen observatory
  81. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  82. IPN triangulation of GRB030425 (single error box)
  83. GRB 030329, the review of the sky area in plate archive (1950-1998)
  84. GRB 030329: optical spectropolarimetry at VLT
  85. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  86. GRB030329: optical polarization
  87. IPN triangulation of GRB030422 (two large error boxes)
  88. GRB030329, optical observation
  89. MASTER:optical observations GRB030418
  90. MASTER:optical observations probable GRB030414
  91. GRB030418: Kiso near infrared observations
  92. GRB 030418: Optical afterglow
  93. OT GRB 030329: early UBVRcIc spectral evolution
  94. OT GRB 030329: early spectrum
  95. IPN triangulation of GRB030414 (small error box)
  96. IPN triangulation of GRB030413 (small error box)
  97. Superluminal motion in GRB 030329 (Correction)
  98. Superluminal motion in GRB 030329
  99. GRB030329, optical position
  100. IPN triangulation of GRB030406 (small error box)

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