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"

28233 results found.

  1. XRF 030723: confirmation of fading optical counterpart
  2. XRF030723(=H2777): Chandra Observations
  3. GRB030723: Upper limits from historical observations
  4. XRF030723: Palomar observations and proposed counterpart
  5. GRB030725 (=H2779): A Bright GRB Localized by HETE
  6. XRF030723 (= H2777): Chandra Observations Scheduled
  7. XRF030723, BVRcIc field photometry correction
  8. XRF030723, ROTSE-III Early Observations
  9. XRF030723, BVRcIc field photometry
  10. XRF 030723, optical observations
  11. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  12. Konus-Wind detection of the bursts from SGR1806-20 region
  13. SGR 1806-20, submm observations
  14. RXTE PCA Observations of SGR1806-20 Region
  15. IPN triangulation of GRB030714 (two large error boxes)
  16. IPN triangulation of GRB030715 (two large error boxes)
  17. GRB030706 triangulation (single large error box)
  18. GRB030329, optical observation in May
  19. IPN triangulation of GRB030626 (single large error box)
  20. IPN triangulation of GRB030626 (two large error boxes)
  21. GRB030329: second XMM-Newton observation
  22. GRB030329 -- RATAN-600 data in April-May
  23. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  24. IPN triangulation of GRB030606 (two alternate error boxes)
  25. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  26. GRB 030528: tentative NIR counterpart
  27. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  28. GRB030528, BVRI field photometry
  29. GRB030329, SPM optical observations
  30. GRB030528: Chandra TOO Planned
  31. GRB030528(=H2724): Revised SXC Localization
  32. GRB 030528 Bisei optical observation
  33. GRB030528 (H2724): A long GRB localized by HETE
  34. GRB 030329: Correction to GCN 2254
  35. GRB 030329: Optical Observations
  36. GRB 030528 (=H2724) Kyoto optical observation
  37. GRB 030416: Optical Observations
  38. GRB 030329 Optical Observations
  39. GRB030329: XMM-Newton observation
  40. GRB 021004: HST observations
  41. GRB030324: Further Observations of the Candidate Optical Afterglow
  42. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  43. IPN triangulation of GRB030519B=H2716 (small error box)
  44. HETE GRB030329, correction to Rc Observations in Loiano
  45. GRB 030329: Optical limit (contemporaneous imaging)
  46. IPN triangulation of GRB030509 (small errror box)
  47. GRB030329, BVRI photometry
  48. GRB030429, refiend optical brightness
  49. GRB 030329: Optical limit (contemporaneous photography)
  50. GRB030418, BVRcIc field photometry
  51. GRB030429, BVRcIc field photometry
  52. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  53. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  54. GRB030329: RTT150 optical observations and upper limit for a host
  55. GRB030501, optical observation
  56. GRB030501 triangulation (correction to GCN 2194)
  57. GRB030329: RTT150 optical observations and upper limit for a host
  58. GRB 030429: redshift from VLT spectroscopy
  59. GRB030501B triangulation (single error box)
  60. GRB 030329, BVRI photometry
  61. GRB030429: Optical Observations
  62. GRB030501: TAROT candidate afterglow present in archival images
  63. GRB 030429: confirmation of afterglow candidate
  64. GRB 030329 Oprical observations in Rozhen observatory
  65. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  66. IPN triangulation of GRB030425 (single error box)
  67. GRB 030329, the review of the sky area in plate archive (1950-1998)
  68. GRB 030329: optical spectropolarimetry at VLT
  69. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  70. GRB030329: optical polarization
  71. IPN triangulation of GRB030422 (two large error boxes)
  72. GRB030329, optical observation
  73. MASTER:optical observations GRB030418
  74. MASTER:optical observations probable GRB030414
  75. GRB030418: Kiso near infrared observations
  76. GRB 030418: Optical afterglow
  77. OT GRB 030329: early UBVRcIc spectral evolution
  78. OT GRB 030329: early spectrum
  79. IPN triangulation of GRB030414 (small error box)
  80. IPN triangulation of GRB030413 (small error box)
  81. Superluminal motion in GRB 030329 (Correction)
  82. Superluminal motion in GRB 030329
  83. GRB030329, optical position
  84. IPN triangulation of GRB030406 (small error box)
  85. IPN triangulation of GRB050403 (small error box)
  86. GRB 030329: BVRI photometry at Asiago
  87. GRB 030329: VLT V-band photometry
  88. Kiso observation of the GRB030329 at April 6
  89. GRB 030329, color evolution
  90. GRB030328, UBVRcIc field photometry
  91. GRB 030329 Optical observations
  92. GRB030329: Kiso B and R band observations
  93. GRB030328: R upper limit after 6 hours by MASTER
  94. SDSS 0.5m PT observations of GRB030329 (correction)
  95. SDSS 0.5m PT observations of GRB030329
  96. GRB030329: final R-band light curve by MASTER
  97. GRB030329, optical observation
  98. GRB030329, new UBVRcIc field photometry
  99. GRB 030329, light curve and SN prediction
  100. GRB 030329, BRI photometry

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