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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"

16161 results found.

  1. GRB 030329/SN 2003dh: Jitter Episode
  2. GRB 030528, Teramo optical observation
  3. GRB 030528 Bisei optical observation
  4. GRB030528 (H2724): A long GRB localized by HETE
  5. GRB 030329: Optical Observations
  6. GRB 030528: Optical observations at RIKEN
  7. GRB 030528 (=H2724) Kyoto optical observation
  8. GRB 030416: Optical Observations
  9. GRB 030329: optical photometry at various french observatories
  10. GRB 030329: optical photometry at Belesta observatory (France)
  11. GRB030329, Optical observations
  12. GRB 030329: HST ACS Observations of the Host
  13. GRB 030329 Optical Observations
  14. GRB030329: XMM-Newton observation
  15. GRB030324: Further Observations of the Candidate Optical Afterglow
  16. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  17. GRB 030418: Second Epoch Optical Observations with Magellan
  18. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  19. GRB 030329: Optical limit (contemporaneous imaging)
  20. GRB030329: RTT150 optical observations
  21. GRB030329, BVRI photometry
  22. GRB030429, refiend optical brightness
  23. GRB 030329: Optical limit (contemporaneous photography)
  24. GRB030418, BVRcIc field photometry
  25. GRB030429, BVRcIc field photometry
  26. GRB030429: RTT150 optical obs., correction to GCN 2208
  27. GRB 030329: High-Resolution Spectroscopy of the Host
  28. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  29. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  30. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  31. GRB030429: RTT150 optical observations, a possible host galaxy
  32. GRB030329: RTT150 optical observations and upper limit for a host
  33. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  34. GRB030501, optical observation
  35. GRB030501 observation report
  36. GRB030329: RTT150 optical observations and upper limit for a host
  37. GRB 030429: Radio Observations
  38. GRB 030429: redshift from VLT spectroscopy
  39. GRB 030329 Optical Observations
  40. GRB030328, optical observation
  41. GRB030429: Optical Observations
  42. GRB030501: TAROT candidate afterglow present in archival images
  43. GRB030429, possible optical counterpart
  44. GRB030425: CrAO optical observation
  45. GRB 030329 Oprical observations in Rozhen observatory
  46. GRB 030324: Radio Observations
  47. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  48. GRB030329, SPM optical observations (Correction)
  49. GRB030329, SPM optical observations
  50. GRB 030329: Spectral Evolution of SN 2003dh
  51. Optical Observations of GRB 030418 with Magellan
  52. GRB 030329: optical spectropolarimetry at VLT
  53. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  54. GRB030329: optical polarization
  55. GRB030329, optical observation
  56. ROTSE-III prompt optical detections of GRB 030418
  57. GRB030418: Upper limits from recent and historical observations.
  58. GRB 030418: Optical afterglow
  59. GRB 030418: Finder for afterglow candidate
  60. GRB 030418: Optical afterglow candidate
  61. GRB 030329 OT position
  62. GRB030329: Optical Observations
  63. GRB030329, UBVRI polarimetry, R-polarization
  64. GRB 030329: SARA Optical Observations
  65. OT GRB 030329: early spectrum
  66. GRB030324: Candidate Optical Afterglow (Erratum)
  67. GRB030324: Candidate Optical Afterglow
  68. GRB 030413: Optical Observations
  69. GRB 030329 Rc observations
  70. GRB030329, optical position
  71. GRB 030329 VLBA Observations
  72. GRB 030329, light curve flattens
  73. GRB 030329: VLT V-band photometry
  74. GRB030329: RTT150 optical observations
  75. GRB030329: Near Infrared Observations at Gunma
  76. GRB030329: HET spectroscopic monitoring
  77. Kiso observation of the GRB030329 at April 6
  78. GRB 030329, color evolution
  79. GRB030328, UBVRcIc field photometry
  80. GRB030329: Optical observcations
  81. GRB030329: BV photographic observations
  82. GRB 030329 Optical observations
  83. GRB 030329, color evolution
  84. GRB 030329: possible color change
  85. GRB030329: RTT150 optical observations
  86. GRB030329: Kiso B and R band observations
  87. GRB030329: RTT150 optical observation
  88. GRB 030329: SARA Optical Observations
  89. GRB 030329: SARA Optical Observations
  90. GRB030329: Optical observations
  91. SDSS 0.5m PT observations of GRB030329 (correction)
  92. SDSS 0.5m PT observations of GRB030329
  93. GRB 030329, Optical observations
  94. GRB030329, cessation of fading
  95. GRB030329: final R-band light curve by MASTER
  96. GRB 030329: SARA Optical Observations
  97. GRB 030329: SARA Optical Observations
  98. GRB030329, optical observation
  99. GRB030329, optical observation
  100. GRB030329, new UBVRcIc field photometry

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