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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.

"N/A_MC170208_R1" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

10922 results found.

  1. GRB 030329: optical observations
  2. GRB030528 (H2724): A long GRB localized by HETE
  3. GRB 030329: HST ACS Observations of the Host
  4. GRB 030329 Optical Observations
  5. GRB030324: Further Observations of the Candidate Optical Afterglow
  6. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  7. IPN triangulation of GRB030519B=H2716 (small error box)
  8. GRB 030418: Second Epoch Optical Observations with Magellan
  9. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  10. IPN triangulation of GRB030519 (annulus)
  11. IPN triangulation of GRB030518A (annulus)
  12. GRB030329: RTT150 optical observations
  13. GRB 030329: Optical limit (contemporaneous photography)
  14. GRB030429: RTT150 optical obs., correction to GCN 2208
  15. GRB 030329: High-Resolution Spectroscopy of the Host
  16. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  17. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  18. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  19. GRB030429: RTT150 optical observations, a possible host galaxy
  20. GRB030329: RTT150 optical observations and upper limit for a host
  21. GRB030329: RTT150 optical observations and upper limit for a host
  22. GRB 030429: IR photometry with IRSF/SIRIUS
  23. GRB 030329, the review of the sky area in plate archive (1950-1998)
  24. Optical Observations of GRB 030418 with Magellan
  25. GRB 030329: optical spectropolarimetry at VLT
  26. GRB030329: 444 AAVSO Measurements
  27. GRB030418: Upper limits from recent and historical observations.
  28. GRB 030418: Optical afterglow candidate
  29. GRB030329: VR Photometry at TNG
  30. GRB030324: Candidate Optical Afterglow
  31. GRB 030413: Optical Observations
  32. IPN triangulation of GRB030413 (small error box)
  33. IPN triangulation of GRB050403 (small error box)
  34. IPN triangulation of GRB030403 (annulus)
  35. GRB 030329: BVRI photometry at Asiago
  36. GRB 030329: VLT V-band photometry
  37. GRB 030329: Supernova Confirmed
  38. GRB030329: RTT150 optical observations
  39. GRB030329: RTT150 optical observations
  40. GRB 030329: Supernova Spectrum Emerging
  41. GRB030329: RTT150 optical observation
  42. GRB 030329, Optical observations
  43. GRB030329: final R-band light curve by MASTER
  44. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  45. GRB030329: optical observations at Tokyo Tech
  46. GRB 030329: optical observations
  47. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  48. GRB030329: Optical observations at Teramo
  49. GRB 030329: beginning of the new fading phase in optical band
  50. GRB 030329, optical spectroscopy
  51. GRB 030329: optical photometry
  52. GRB 030329: further optical observations
  53. GRB030329: R and B observations
  54. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  55. GRB 030329: Light curve observed during the change of its slope.
  56. GRB 030329: Optical Decay
  57. GRB030329: optical spectroscopy with the TNG
  58. GRB030328: X-ray Afterglow Observed with Chandra
  59. GRB 030329: optical observations
  60. GRB030329: Upper limits from recent and historical observations.
  61. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  62. GRB 030328: optical observations
  63. GRB030328: optical spectroscopy at TNG
  64. GRB030328: optical photometry at the TNG
  65. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  66. Re: GRB 030328: Finding chart
  67. GRB030324, optical observations
  68. GRB030323: Upper limits from recent and historical observations.
  69. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  70. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  71. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  72. GRB 030324, optical observations
  73. IPN triangulation of GRB030320B (annulus)
  74. GRB030226, addendum to GCN 1892
  75. IPN upper limit to a GRB associated with SN2003L
  76. IPN triangulation of GRB030317 (annulus)
  77. IPN triangulation of GRB030307 (annulus)
  78. GRB030226: Optical observations at Asiago
  79. GRB 030227: Optical observations
  80. IPN triangulation of GRB030301 (annulus)
  81. 030302: NOT A GRB
  82. 030228: NOT A GRB
  83. GRB 030226: R band polarimetric observations
  84. GRB 20030226: Upper limits from recent and historical observations
  85. GRB030227 - faint tentative OT candidate
  86. XMM-Newton observation of GRB030227
  87. GRB030226: ESI spectroscopy
  88. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  89. GRB030226: optical observations and refined redshift
  90. GRB 030226 Optical Spectra and R,I,z' Imaging
  91. GRB030226: Candidate optical afterglow
  92. IPN triangulation of GRB030220 (annulus)
  93. IPN triangulation of GRB030217 (small error box)
  94. IPN triangulation of GRB030215C (annulus)
  95. IPN triangulation of GRB030217 (annulus)
  96. IPN triangulation of GRB030215A and GRB030215B (annuli)
  97. IPN triangulation of GRB030204 (small error box)
  98. IPN triangulation of GRB030127 (annulus)
  99. GRB 030115: Further IR observations with IRSF/SIRIUS
  100. GRB 030115: IR observations with IRSF/SIRIUS

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